/* ==========================================================
   MathTest v3.1 Premium
   ========================================================== */
:root, [data-theme="dark"] {
  --bg:         #08080a;
  --bg-soft:    #0e0e10;
  --panel:      #141416;
  --panel-2:    #1a1a1d;
  --panel-hover:#1f1f23;
  --border:     #2a2a2e;
  --border-soft:#1a1a1d;
  --text:   #ffffff;
  --text-2: #a1a1a8;
  --text-3: #5a5a62;
  --accent:       #ff6b1f;
  --accent-hover: #ff5a05;
  --accent-soft:  rgba(255, 107, 31, .14);
  --accent-text:  #ffffff;
  --ok:   #22c55e;
  --warn: #f59e0b;
  --err:  #ef4444;
  --radius-sm: 12px;
  --radius:    16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.5);
  --shadow:    0 12px 40px -12px rgba(0,0,0,.7);
  --shadow-lg: 0 32px 80px -32px rgba(0,0,0,.9);
  --trans:      .22s cubic-bezier(.4, 0, .2, 1);
  --trans-fast: .14s cubic-bezier(.4, 0, .2, 1);
}
[data-theme="light"] {
  --bg: #ffffff; --bg-soft: #fafafa; --panel: #ffffff; --panel-2: #f4f4f5;
  --panel-hover:#ebebed; --border: #e4e4e7; --border-soft:#efeff1;
  --text: #09090b; --text-2: #52525b; --text-3: #a1a1aa;
  --accent: #ff6b1f; --accent-hover: #ff5a05; --accent-soft: rgba(255,107,31,.1);
  --ok: #16a34a; --warn: #d97706; --err: #dc2626;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow: 0 12px 40px -12px rgba(0,0,0,.12);
  --shadow-lg: 0 32px 80px -32px rgba(0,0,0,.2);
}
[data-palette="orange"]  { --accent: #ff6b1f; --accent-hover: #ff5a05; --accent-soft: rgba(255,107,31,.14); }
[data-palette="blue"]    { --accent: #3b82f6; --accent-hover: #2563eb; --accent-soft: rgba(59,130,246,.14); }
[data-palette="violet"]  { --accent: #a855f7; --accent-hover: #9333ea; --accent-soft: rgba(168,85,247,.14); }
[data-palette="emerald"] { --accent: #10b981; --accent-hover: #059669; --accent-soft: rgba(16,185,129,.14); }

[hidden] { display: none !important; }
.view:not(.active) { display: none !important; }
.view.active { display: block !important; }
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }

html { color-scheme: dark; }
[data-theme="light"] { color-scheme: light; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Segoe UI", Roboto, sans-serif;
  font-size: 15px; line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  letter-spacing: -0.01em;
  min-height: 100vh;
  transition: background var(--trans), color var(--trans);
}
::selection { background: var(--accent); color: var(--accent-text); }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); }

/* TOPBAR */
#topbar {
  display: flex; align-items: center; gap: 8px;
  padding: 14px 28px;
  background: rgba(8, 8, 10, .8);
  backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--border-soft);
  position: sticky; top: 0; z-index: 50;
}
[data-theme="light"] #topbar { background: rgba(255, 255, 255, .85); }
.brand { font-weight: 900; font-size: 18px; letter-spacing: -0.03em; display: flex; align-items: center; gap: 12px; cursor: pointer; user-select: none; }
.brand .sigma { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: 12px; background: var(--accent); color: var(--accent-text); font-size: 20px; font-weight: 900; transition: transform var(--trans); }
.brand:hover .sigma { transform: rotate(-10deg) scale(1.08); }
.spacer { flex: 1; }
.icon-btn {
  width: 42px; height: 42px; border-radius: 12px;
  border: 1px solid transparent; background: transparent; color: var(--text-2);
  padding: 0; display: inline-flex; align-items: center; justify-content: center;
  position: relative; cursor: pointer; transition: var(--trans);
}
.icon-btn svg { width: 20px; height: 20px; stroke-width: 2; transition: transform var(--trans-fast); }
.icon-btn:hover { background: var(--panel-2); color: var(--text); }
.icon-btn:hover svg { transform: scale(1.08); }
.icon-btn:active { transform: scale(.94); }
.notif-badge {
  position: absolute; top: 2px; right: 2px; min-width: 20px; height: 20px; padding: 0 6px;
  border-radius: 99px; background: var(--accent); color: var(--accent-text);
  font-size: 11px; font-weight: 800; display: inline-flex; align-items: center; justify-content: center;
  box-shadow: 0 0 0 2px var(--bg);
}

/* USER CHIP */
.user-chip-wrap { position: relative; margin-left: 4px; }
.user-chip {
  display: flex; align-items: center; gap: 10px;
  background: var(--panel-2); border: 1px solid var(--border-soft);
  border-radius: 99px; padding: 5px 12px 5px 6px;
  font-size: 14px; cursor: pointer; transition: var(--trans); user-select: none;
}
.user-chip:hover { border-color: var(--border); background: var(--panel-hover); }
.user-chip.open { border-color: var(--accent); background: var(--accent-soft); }
.user-chip .avatar {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border-radius: 50%; flex: none;
  background: var(--accent); color: var(--accent-text);
  font-size: 13px; font-weight: 800; background-size: cover; background-position: center;
}
.user-chip .chip-name { font-weight: 700; font-size: 13.5px; line-height: 1.15; max-width: 140px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-chip .chip-role { color: var(--text-3); font-size: 11px; font-weight: 600; line-height: 1.15; }
.user-chip .chip-caret { color: var(--text-3); transition: transform var(--trans-fast); display: flex; align-items: center; }
.user-chip .chip-caret svg { width: 14px; height: 14px; }
.user-chip.open .chip-caret { transform: rotate(180deg); color: var(--accent); }
.user-menu {
  position: absolute; top: calc(100% + 8px); right: 0; min-width: 280px;
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  padding: 8px; z-index: 120;
  animation: menu-in .18s cubic-bezier(.34, 1.56, .64, 1);
  transform-origin: top right;
}
@keyframes menu-in { from { transform: scale(.92) translateY(-6px); opacity: 0; } to { transform: scale(1) translateY(0); opacity: 1; } }
.user-menu-item {
  display: flex; align-items: center; gap: 14px;
  padding: 11px 14px; border-radius: var(--radius-sm);
  cursor: pointer; color: var(--text); font-size: 14px; font-weight: 600;
  transition: var(--trans-fast); background: transparent; border: none; width: 100%; text-align: left; font-family: inherit;
}
.user-menu-item:hover { background: var(--panel-2); }
.user-menu-item .um-icon {
  width: 32px; height: 32px; flex: none; border-radius: 10px;
  background: var(--panel-2); display: flex; align-items: center; justify-content: center;
  color: var(--text-2); transition: var(--trans-fast);
}
.user-menu-item:hover .um-icon { background: var(--accent-soft); color: var(--accent); }
.user-menu-item .um-icon svg { width: 16px; height: 16px; stroke-width: 2; }
.user-menu-item .um-hint { font-size: 11.5px; color: var(--text-3); font-weight: 500; }
.user-menu-sep { height: 1px; background: var(--border-soft); margin: 6px 8px; }
.user-menu-item.danger { color: var(--err); }
.user-menu-item.danger .um-icon { color: var(--err); }
.user-menu-item.danger:hover { background: rgba(239, 68, 68, .1); }

main { max-width: 1320px; margin: 0 auto; padding: 40px 32px 120px; }
.view.active { animation: view-in .35s cubic-bezier(.4, 0, .2, 1); }
@keyframes view-in { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

.reveal { opacity: 0; transform: translateY(30px); transition: opacity .7s cubic-bezier(.4, 0, .2, 1), transform .7s cubic-bezier(.4, 0, .2, 1); }
.reveal.visible { opacity: 1; transform: none; }

/* LANDING */
#view-landing { margin: -40px -32px 0; }
.landing { padding: 60px 40px 0; max-width: 1400px; margin: 0 auto; position: relative; overflow: hidden; }
.landing .math-deco { position: absolute; font-family: "Times New Roman", Georgia, serif; font-weight: 400; color: var(--text); opacity: .05; pointer-events: none; user-select: none; line-height: 1; z-index: 0; }
.landing .math-deco.d1 { font-size: 280px; top: 60px; left: -60px; transform: rotate(-12deg); }
.landing .math-deco.d2 { font-size: 200px; top: 120px; right: -20px; transform: rotate(15deg); }
.landing .math-deco.d3 { font-size: 160px; top: 520px; left: 40%; opacity: .03; }
.landing .math-deco.d4 { font-size: 240px; bottom: 40px; right: 60px; transform: rotate(-8deg); }
.hero-2col { display: grid; grid-template-columns: 1.05fr 1fr; gap: 60px; align-items: center; padding: 40px 0 80px; position: relative; z-index: 1; }
@media (max-width: 980px) { .hero-2col { grid-template-columns: 1fr; gap: 40px; padding: 20px 0 60px; } }
.hero-2col .hero-text { text-align: left; }
.hero-2col .hero-text .landing-h1 { text-align: left; margin: 0 0 28px; font-size: clamp(44px, 6.5vw, 92px); }
.hero-2col .hero-text .landing-sub { text-align: left; margin: 0 0 40px; max-width: 560px; }
.hero-2col .hero-text .landing-cta { justify-content: flex-start; margin-bottom: 0; }
.hero-visual { position: relative; height: 520px; display: flex; align-items: center; justify-content: center; }
@media (max-width: 980px) { .hero-visual { height: 380px; } }
.hero-visual .formula-card {
  position: absolute; background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 18px 24px;
  box-shadow: var(--shadow-lg); font-size: 22px;
  animation: float-card 6s ease-in-out infinite; backdrop-filter: blur(12px); z-index: 2;
}
.hero-visual .formula-card .fc-label { font-size: 10.5px; color: var(--text-3); letter-spacing: 1.5px; text-transform: uppercase; font-weight: 800; margin-bottom: 8px; }
.hero-visual .formula-card.card-1 { top: 6%; left: 4%; animation-delay: 0s; --r:-4deg; }
.hero-visual .formula-card.card-2 { top: 42%; right: 0; animation-delay: 1.5s; --r:3deg; }
.hero-visual .formula-card.card-3 { bottom: 4%; left: 12%; animation-delay: 3s; --r:-2deg; }
@keyframes float-card { 0%,100% { transform: translateY(0) rotate(var(--r, -3deg)); } 50% { transform: translateY(-14px) rotate(var(--r, -3deg)); } }
.hero-visual::before { content: ''; position: absolute; inset: 15%; border-radius: 50%; background: radial-gradient(circle at 30% 30%, var(--accent-soft), transparent 65%); filter: blur(40px); z-index: 0; }
.hero-visual .big-symbol { font-family: "Times New Roman", Georgia, serif; font-size: 340px; font-weight: 400; line-height: 1; color: var(--accent); opacity: .09; user-select: none; pointer-events: none; animation: rotate-slow 40s linear infinite; z-index: 1; }
@keyframes rotate-slow { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.hero-visual .stat-badge { position: absolute; top: 0; right: 6%; background: var(--ok); color: #fff; font-size: 11px; font-weight: 800; padding: 8px 14px; border-radius: 10px; letter-spacing: .3px; transform: rotate(4deg); box-shadow: var(--shadow); z-index: 3; }
.hero-visual .stat-badge .big { font-size: 18px; display: block; line-height: 1.1; margin-bottom: 1px; }
.landing-badge { display: inline-flex; align-items: center; gap: 10px; padding: 10px 20px; border-radius: 99px; background: var(--panel); border: 1px solid var(--border-soft); font-size: 13px; font-weight: 700; color: var(--text-2); margin-bottom: 32px; }
.landing-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 4px rgba(34,197,94,.15); }
.landing-h1 { font-size: clamp(48px, 8.5vw, 116px); font-weight: 900; letter-spacing: -0.05em; line-height: 0.98; margin-bottom: 32px; max-width: 1180px; margin-left: auto; margin-right: auto; }
.landing-h1 .accent { color: var(--accent); position: relative; display: inline-block; }
.landing-sub { font-size: clamp(16px, 1.5vw, 19px); color: var(--text-2); max-width: 620px; margin: 0 auto 48px; line-height: 1.6; }
.landing-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 80px; }
.landing-cta button { padding: 22px 44px; font-size: 17px; font-weight: 800; border-radius: var(--radius); letter-spacing: -0.01em; }
.landing-stats-row { display: flex; justify-content: center; gap: 64px; flex-wrap: wrap; padding: 40px 0 80px; border-top: 1px solid var(--border-soft); border-bottom: 1px solid var(--border-soft); }
.landing-stat { text-align: center; }
.landing-stat .ls-value { font-size: clamp(36px, 4vw, 54px); font-weight: 900; letter-spacing: -0.04em; color: var(--text); line-height: 1; margin-bottom: 10px; font-variant-numeric: tabular-nums; }
.landing-stat .ls-value.accent { color: var(--accent); }
.landing-stat .ls-label { font-size: 12px; color: var(--text-3); text-transform: uppercase; letter-spacing: 2px; font-weight: 800; }
.landing-section-title { font-size: clamp(32px, 4vw, 56px); font-weight: 900; letter-spacing: -0.04em; line-height: 1.05; margin: 0 0 48px; padding-top: 80px; max-width: 800px; }
.landing-section-title .muted { color: var(--text-3); font-weight: 900; }
.landing-features { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; padding-bottom: 80px; }
.landing-feature { background: var(--panel); border-radius: var(--radius-lg); padding: 36px 32px; border: 1px solid var(--border-soft); transition: var(--trans); position: relative; overflow: hidden; min-height: 240px; display: flex; flex-direction: column; }
.landing-feature:hover { border-color: var(--accent); transform: translateY(-6px); box-shadow: var(--shadow); }
.landing-feature .lf-icon { width: 56px; height: 56px; border-radius: 16px; background: var(--accent-soft); display: flex; align-items: center; justify-content: center; margin-bottom: 26px; color: var(--accent); flex: none; }
.landing-feature .lf-icon svg { width: 26px; height: 26px; stroke-width: 2; }
.landing-feature h3 { font-size: 22px; font-weight: 800; letter-spacing: -0.025em; margin-bottom: 12px; line-height: 1.15; }
.landing-feature p { color: var(--text-2); font-size: 14.5px; line-height: 1.6; }
.landing-final { background: var(--panel); border-radius: var(--radius-xl); padding: 80px 60px; text-align: center; border: 1px solid var(--border-soft); position: relative; overflow: hidden; margin-bottom: 40px; }
.landing-final::before { content: ''; position: absolute; top: -200px; right: -200px; width: 600px; height: 600px; background: radial-gradient(circle, var(--accent-soft) 0%, transparent 60%); pointer-events: none; }
.landing-final h2 { font-size: clamp(36px, 5vw, 64px); font-weight: 900; letter-spacing: -0.04em; line-height: 1.05; margin-bottom: 24px; position: relative; }
.landing-final p { font-size: 17px; color: var(--text-2); max-width: 520px; margin: 0 auto 40px; position: relative; }
.landing-final button { padding: 22px 44px; font-size: 17px; font-weight: 800; position: relative; }
.landing-footer { text-align: center; padding: 60px 20px 40px; color: var(--text-3); font-size: 13px; border-top: 1px solid var(--border-soft); margin: 0 -40px; }

/* AUTH */
#view-auth { min-height: calc(100vh - 120px); display: flex; align-items: center; justify-content: center; }
.auth-card { width: 100%; max-width: 480px; background: var(--panel); border-radius: var(--radius-xl); padding: 48px 44px; border: 1px solid var(--border-soft); position: relative; overflow: hidden; }
.auth-card::before { content: ''; position: absolute; top: -150px; right: -150px; width: 400px; height: 400px; background: radial-gradient(circle, var(--accent-soft) 0%, transparent 60%); pointer-events: none; }
.auth-card > * { position: relative; }
.auth-title { font-size: 40px; font-weight: 900; letter-spacing: -0.04em; line-height: 1.05; margin-bottom: 12px; text-align: center; }
.auth-sub { color: var(--text-2); text-align: center; margin-bottom: 32px; font-size: 15px; }

.card { background: var(--panel); border-radius: var(--radius-lg); padding: 32px; margin-bottom: 20px; transition: var(--trans); border: 1px solid var(--border-soft); }
.card h2 { font-size: 28px; margin-bottom: 22px; letter-spacing: -0.03em; font-weight: 900; }
.card h3 { font-size: 19px; margin-bottom: 16px; letter-spacing: -0.02em; font-weight: 800; }
h1 { font-size: 72px; font-weight: 900; letter-spacing: -0.04em; line-height: 1.05; }
h2 { font-size: 44px; font-weight: 900; letter-spacing: -0.03em; line-height: 1.1; }
.page-title { font-size: clamp(40px, 6vw, 72px); font-weight: 900; letter-spacing: -0.045em; line-height: 1; margin: 0; }
h4.sec { color: var(--text-3); text-transform: uppercase; font-size: 11px; letter-spacing: 2px; margin: 32px 0 14px; font-weight: 800; }
.muted { color: var(--text-2); font-size: 14px; }
.err { color: var(--err); min-height: 20px; font-size: 14px; }
.ok { color: var(--ok); min-height: 20px; font-size: 14px; }

label { display: block; margin: 16px 0; color: var(--text-2); font-size: 13px; font-weight: 700; }
input[type="text"], input[type="email"], input[type="password"], input[type="number"],
input[type="file"], input[type="datetime-local"], input[type="date"], input[type="time"],
select, textarea {
  width: 100%; margin-top: 8px; padding: 16px 20px;
  border-radius: var(--radius); border: 1.5px solid var(--border);
  background: var(--bg-soft); color: var(--text);
  font: inherit; font-size: 15px; transition: var(--trans); outline: none;
  color-scheme: inherit;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); background: var(--panel-2); box-shadow: 0 0 0 4px var(--accent-soft); }
input::placeholder, textarea::placeholder { color: var(--text-3); }
textarea { resize: vertical; font-family: inherit; }
code { background: var(--panel-2); padding: 2px 6px; border-radius: 6px; font-size: 12.5px; color: var(--accent); }

input:-webkit-autofill,
input:-webkit-autofill:hover,
input:-webkit-autofill:focus,
textarea:-webkit-autofill,
select:-webkit-autofill {
  -webkit-text-fill-color: var(--text) !important;
  -webkit-box-shadow: 0 0 0 1000px var(--bg-soft) inset !important;
  box-shadow: 0 0 0 1000px var(--bg-soft) inset !important;
  transition: background-color 9999s ease-out 0s;
  caret-color: var(--text);
}
select option { background: var(--panel); color: var(--text); }
input[type="datetime-local"]::-webkit-calendar-picker-indicator,
input[type="date"]::-webkit-calendar-picker-indicator,
input[type="time"]::-webkit-calendar-picker-indicator { filter: invert(.85); cursor: pointer; }
[data-theme="light"] input[type="datetime-local"]::-webkit-calendar-picker-indicator,
[data-theme="light"] input[type="date"]::-webkit-calendar-picker-indicator { filter: none; }
input[type="file"] { color: var(--text-2); cursor: pointer; }

.pass-wrap { position: relative; }
.pass-wrap input { padding-right: 52px; }
.pass-toggle { position: absolute; right: 10px; top: 50%; transform: translateY(-50%); width: 38px; height: 38px; background: transparent; border: none; cursor: pointer; color: var(--text-3); border-radius: 10px; padding: 0; display: flex; align-items: center; justify-content: center; }
.pass-toggle svg { width: 18px; height: 18px; }
.pass-toggle:hover { color: var(--text); background: var(--panel); }

button {
  cursor: pointer; font: inherit; font-weight: 700; font-size: 15px;
  border-radius: var(--radius); border: 1.5px solid var(--border);
  background: var(--panel-2); color: var(--text);
  padding: 14px 24px; transition: var(--trans);
  display: inline-flex; align-items: center; justify-content: center;
  gap: 10px; white-space: nowrap; position: relative; overflow: hidden;
}
button svg { width: 18px; height: 18px; stroke-width: 2.5; flex: none; }
button:hover { background: var(--panel-hover); transform: translateY(-2px); box-shadow: var(--shadow); }
button:active { transform: translateY(0) scale(.98); }
button:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 800; }
button.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); box-shadow: 0 16px 40px -10px var(--accent-soft); }
button.primary:disabled { opacity: .4; cursor: not-allowed; }
button.ghost { background: transparent; border-color: transparent; }
button.ghost:hover { background: var(--panel-2); border-color: var(--border-soft); box-shadow: none; }
button.small { padding: 10px 16px; font-size: 13.5px; gap: 8px; }
button.small svg { width: 15px; height: 15px; }
button.danger { color: var(--err); }
button.danger:hover { background: rgba(239, 68, 68, .12); border-color: rgba(239, 68, 68, .4); }
button.block { width: 100%; }

.row { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; flex-wrap: wrap; }
.row.tight { margin-bottom: 12px; }
.grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.two-col { display: grid; gap: 24px; grid-template-columns: 1fr 1fr; }
@media (max-width: 900px) { .two-col { grid-template-columns: 1fr; } }
.tabs { display: flex; gap: 6px; margin-bottom: 28px; padding: 6px; background: var(--panel); border-radius: var(--radius); width: fit-content; border: 1px solid var(--border-soft); }
.tab { border: none; background: transparent; padding: 12px 22px; border-radius: 12px; color: var(--text-2); font-weight: 700; font-size: 14px; transition: var(--trans-fast); }
.tab:hover { color: var(--text); background: var(--panel-2); transform: none; box-shadow: none; }
.tab.active { background: var(--accent); color: var(--accent-text); font-weight: 800; }

.badge { display: inline-flex; align-items: center; justify-content: center; min-width: 28px; height: 28px; padding: 0 10px; border-radius: 99px; background: var(--accent); color: var(--accent-text); font-size: 12.5px; font-weight: 800; flex: none; }
.badge.red { background: var(--err); }
.badge.gray { background: var(--panel-2); color: var(--text-2); }
.badge.green { background: var(--ok); }
.pill { font-size: 12.5px; padding: 6px 14px; border-radius: 99px; border: 1px solid var(--border); color: var(--text-2); display: inline-flex; align-items: center; gap: 6px; background: var(--panel-2); font-weight: 700; }
.pill.blue { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.pill.green { border-color: rgba(34,197,94,.4); color: var(--ok); background: rgba(34,197,94,.08); }
.pill.red { border-color: rgba(239,68,68,.4); color: var(--err); background: rgba(239,68,68,.08); }
.pill.warn { border-color: rgba(245,158,11,.4); color: var(--warn); background: rgba(245,158,11,.08); }
.pill.deadline { border-color: rgba(245,158,11,.5); color: var(--warn); background: rgba(245,158,11,.08); }
.pill.deadline.overdue { border-color: rgba(239,68,68,.5); color: var(--err); background: rgba(239,68,68,.08); }
.pill.deadline.soon { border-color: rgba(245,158,11,.6); color: var(--warn); background: rgba(245,158,11,.12); }

.stu-row { display: flex; align-items: center; gap: 16px; padding: 16px 20px; background: var(--panel-2); border-radius: var(--radius); margin-bottom: 8px; transition: var(--trans); border: 1px solid transparent; }
.stu-row:hover { background: var(--panel-hover); border-color: var(--border-soft); }
.stu-row .name { flex: 1; min-width: 0; }
.stu-row .score { font-weight: 900; min-width: 90px; text-align: right; font-variant-numeric: tabular-nums; font-size: 15px; }

.class-card { background: var(--panel); border-radius: var(--radius-lg); padding: 28px; margin-bottom: 14px; display: flex; align-items: center; gap: 20px; flex-wrap: wrap; transition: var(--trans); border: 1px solid var(--border-soft); }
.class-card:hover { border-color: var(--border); transform: translateY(-3px); box-shadow: var(--shadow); }
.class-card h4 { margin: 0; font-size: 22px; font-weight: 900; }
.code-box { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 20px; letter-spacing: 5px; font-weight: 900; background: var(--accent-soft); border: 2px solid var(--accent); color: var(--accent); padding: 12px 22px; border-radius: var(--radius); cursor: pointer; user-select: none; transition: var(--trans); }
.code-box:hover { background: var(--accent); color: var(--accent-text); }
.code-box:active { transform: scale(.98); }
.test-card { background: var(--panel); border-radius: var(--radius-lg); padding: 28px; margin-bottom: 14px; transition: var(--trans); border: 1px solid var(--border-soft); }
.test-card h4 { margin: 0 0 12px; font-size: 22px; font-weight: 900; }
.test-card .meta { color: var(--text-2); font-size: 13.5px; margin-bottom: 18px; display: flex; flex-wrap: wrap; gap: 8px; }
.test-card-v2 { background: var(--panel); border-radius: var(--radius-lg); padding: 24px; margin-bottom: 12px; border: 1px solid var(--border-soft); transition: var(--trans); position: relative; overflow: hidden; }
.test-card-v2:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: var(--shadow); }
.test-card-v2 .tc-top { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 18px; }
.test-card-v2 .tc-icon { width: 44px; height: 44px; border-radius: 12px; background: var(--accent-soft); color: var(--accent); display: flex; align-items: center; justify-content: center; flex: none; }
.test-card-v2 .tc-icon svg { width: 20px; height: 20px; stroke-width: 2; }
.test-card-v2 .tc-title { flex: 1; min-width: 0; }
.test-card-v2 .tc-title h4 { margin: 0 0 6px; font-size: 17px; font-weight: 800; line-height: 1.25; }
.test-card-v2 .tc-status { font-size: 12px; font-weight: 700; color: var(--text-3); display: inline-flex; align-items: center; gap: 6px; }
.test-card-v2 .tc-status.active { color: var(--ok); }
.test-card-v2 .tc-status .dot { width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.test-card-v2 .tc-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.test-card-v2 .tc-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.class-pick { display: flex; align-items: center; gap: 14px; padding: 16px 20px; background: var(--panel-2); border-radius: var(--radius); margin: 8px 0; cursor: pointer; transition: var(--trans); border: 1.5px solid transparent; font-size: 14.5px; }
.class-pick:hover { background: var(--panel-hover); border-color: var(--accent); }
.class-pick input[type=checkbox] { width: 22px; height: 22px; margin: 0; accent-color: var(--accent); cursor: pointer; flex: none; }

.mi-wrap { margin: 12px 0 18px; }
.mi-input { width: 100%; padding: 18px 22px; border: 1.5px solid var(--border); border-radius: var(--radius); background: var(--bg-soft); color: var(--text); font: 15px/1.5 ui-monospace, "SF Mono", Menlo, Consolas, monospace; resize: vertical; min-height: 64px; outline: none; transition: var(--trans); }
.mi-input:focus { border-color: var(--accent); background: var(--panel-2); box-shadow: 0 0 0 4px var(--accent-soft); }
.mi-input[readonly] { background: var(--panel-2); border-style: dashed; color: var(--text-2); }
.mi-preview { min-height: 36px; padding: 12px 20px; margin-top: 8px; background: var(--bg-soft); border: 1.5px dashed var(--border-soft); border-radius: var(--radius); color: var(--text); font-size: 17px; overflow-x: auto; }
.mi-preview:empty { display: none; }
.sym-tabs { display: flex; gap: 6px; margin: 10px 0 14px; }
.sym-tab { border: 1.5px solid var(--border); background: transparent; padding: 8px 18px; border-radius: 10px; font-size: 13px; color: var(--text-2); cursor: pointer; transition: var(--trans-fast); font-weight: 700; }
.sym-tab:hover { border-color: var(--accent); color: var(--accent); }
.sym-tab.active { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.symbols { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 20px; }
.symbols button { padding: 10px 16px; font-size: 16px; min-width: 52px; font-family: "Times New Roman", Georgia, serif; background: var(--panel-2); border-color: var(--border-soft); font-weight: 400; }
.symbols button:hover { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.option-row { display: flex; align-items: center; gap: 12px; margin: 12px 0; }
.option-row input[type=radio] { width: 22px; height: 22px; margin: 0; flex: none; accent-color: var(--accent); cursor: pointer; }
.option-row .mi-wrap { flex: 1; margin: 0; }

.result-line { padding: 22px 26px; border-radius: var(--radius-lg); margin: 12px 0; background: var(--panel-2); border-left: 4px solid var(--border); }
.result-line.ok { border-left-color: var(--ok); background: rgba(34,197,94,.05); }
.result-line.err { border-left-color: var(--err); background: rgba(239,68,68,.05); }

.score-circle {
  --size: 180px;
  width: var(--size); height: var(--size); border-radius: 50%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  position: relative; flex: none;
  background: conic-gradient(var(--ok) calc(var(--pct) * 1%), var(--border) 0);
}
.score-circle::before { content: ""; position: absolute; inset: 12px; border-radius: 50%; background: var(--panel); }
.score-circle .val { position: relative; font-size: 36px; font-weight: 900; font-variant-numeric: tabular-nums; letter-spacing: -0.04em; }
.score-circle .lbl { position: relative; font-size: 13px; color: var(--text-2); margin-top: 4px; font-weight: 700; }
.score-circle[data-grade="bad"] { background: conic-gradient(var(--err) calc(var(--pct) * 1%), var(--border) 0); }
.score-circle[data-grade="mid"] { background: conic-gradient(var(--warn) calc(var(--pct) * 1%), var(--border) 0); }

.take-slider { position: sticky; top: 84px; z-index: 20; background: var(--panel); border-radius: var(--radius-lg); padding: 16px 22px; margin-bottom: 24px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; backdrop-filter: blur(16px); border: 1px solid var(--border-soft); }
.take-slider .ts-info { font-size: 13.5px; color: var(--text-2); font-weight: 700; min-width: 130px; }
.take-slider .ts-info b { color: var(--text); font-weight: 900; }
.take-slider .ts-track { flex: 1; min-width: 120px; height: 6px; background: var(--bg-soft); border-radius: 99px; overflow: hidden; }
.take-slider .ts-fill { height: 100%; background: var(--accent); border-radius: 99px; transition: width .4s cubic-bezier(.4, 0, .2, 1); }
.take-slider .ts-dots { display: flex; gap: 6px; flex-wrap: wrap; }
.take-slider .ts-dot { width: 28px; height: 28px; border-radius: 8px; background: var(--panel-2); border: 1.5px solid var(--border); color: var(--text-3); font-size: 12px; font-weight: 800; cursor: pointer; transition: var(--trans-fast); display: inline-flex; align-items: center; justify-content: center; padding: 0; }
.take-slider .ts-dot:hover { border-color: var(--accent); color: var(--accent); box-shadow: none; }
.take-slider .ts-dot.active { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.take-slider .ts-dot.filled { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.take-slider .ts-dot.filled.active { background: var(--accent); color: var(--accent-text); }
.take-task .task-nav { display: flex; gap: 12px; justify-content: space-between; margin-top: 24px; }
.timer { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 20px; font-weight: 900; font-variant-numeric: tabular-nums; padding: 8px 16px; border-radius: 12px; background: var(--accent-soft); color: var(--accent); transition: var(--trans); }
.timer.warning { background: rgba(245,158,11,.15); color: var(--warn); }
.timer.critical { background: rgba(239,68,68,.15); color: var(--err); }
.draft-hint { font-size: 13px; color: var(--text-2); padding: 10px 20px; background: var(--panel-2); border: 1.5px dashed var(--border); border-radius: var(--radius); margin-bottom: 18px; display: inline-block; font-weight: 600; }

.empty { color: var(--text-2); padding: 80px 32px; text-align: center; font-size: 15px; line-height: 1.7; }
.empty .icon { font-size: 64px; margin-bottom: 20px; display: block; opacity: .3; }
.skeleton { display: flex; flex-direction: column; gap: 14px; }
.sk-line { height: 18px; border-radius: 10px; background: linear-gradient(90deg, var(--panel) 0%, var(--panel-2) 50%, var(--panel) 100%); background-size: 200% 100%; animation: sk 1.6s ease-in-out infinite; }
.sk-line.w40 { width: 40%; } .sk-line.w60 { width: 60%; } .sk-line.w80 { width: 80%; }
@keyframes sk { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

#toasts { position: fixed; top: 100px; right: 32px; z-index: 999; display: flex; flex-direction: column; gap: 12px; pointer-events: none; }
.toast { pointer-events: auto; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 22px; min-width: 320px; max-width: 420px; box-shadow: var(--shadow-lg); display: flex; align-items: flex-start; gap: 14px; font-size: 14.5px; font-weight: 600; animation: toast-in .35s cubic-bezier(.34, 1.56, .64, 1); border-left: 4px solid var(--accent); }
.toast.ok { border-left-color: var(--ok); } .toast.err { border-left-color: var(--err); } .toast.warn { border-left-color: var(--warn); }
.toast .ico { font-size: 18px; flex: none; margin-top: 1px; }
.toast.hide { animation: toast-out .25s ease forwards; }
@keyframes toast-in { from { transform: translateX(120%); opacity: 0; } to { transform: none; opacity: 1; } }
@keyframes toast-out { to { transform: translateX(120%); opacity: 0; } }

#toTop { position: fixed; bottom: 32px; right: 32px; z-index: 60; width: 56px; height: 56px; border-radius: 18px; background: var(--panel); border: 1px solid var(--border); color: var(--text); display: none; align-items: center; justify-content: center; box-shadow: var(--shadow-lg); padding: 0; transition: var(--trans); }
#toTop svg { width: 22px; height: 22px; }
#toTop.show { display: flex; }
#toTop:hover { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }

.notif-panel { position: fixed; top: 80px; right: 28px; width: 420px; max-width: calc(100vw - 48px); background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); z-index: 100; overflow: hidden; animation: notif-in .25s cubic-bezier(.34, 1.56, .64, 1); }
@keyframes notif-in { from { transform: translateY(-12px); opacity: 0; } to { transform: none; opacity: 1; } }
.notif-head { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px; border-bottom: 1px solid var(--border-soft); font-weight: 900; font-size: 16px; }
.notif-list { max-height: 480px; overflow-y: auto; }
.notif-item { padding: 16px 24px; border-bottom: 1px solid var(--border-soft); cursor: pointer; transition: var(--trans-fast); display: flex; gap: 14px; align-items: flex-start; }
.notif-item:hover { background: var(--panel-2); }
.notif-item.unread { background: var(--accent-soft); border-left: 3px solid var(--accent); }
.notif-item .ni-icon { font-size: 22px; flex: none; margin-top: 2px; }
.notif-item .ni-body { flex: 1; min-width: 0; }
.notif-item .ni-title { font-weight: 800; font-size: 14px; margin-bottom: 4px; }
.notif-item .ni-text { font-size: 13px; color: var(--text-2); margin-bottom: 4px; }
.notif-item .ni-time { font-size: 11.5px; color: var(--text-3); }

.analytics-row { display: flex; align-items: center; gap: 16px; padding: 18px 22px; background: var(--panel-2); border-radius: var(--radius); margin-bottom: 10px; }
.analytics-row .num { font-weight: 900; color: var(--text-3); font-size: 15px; min-width: 28px; }
.analytics-row .body { flex: 1; min-width: 0; }
.analytics-row .bar-track { height: 10px; background: var(--bg); border-radius: 99px; overflow: hidden; margin-top: 10px; }
.analytics-row .bar-fill { height: 100%; border-radius: 99px; transition: width .6s cubic-bezier(.4, 0, .2, 1); }
.analytics-row .pct { font-weight: 900; font-variant-numeric: tabular-nums; min-width: 64px; text-align: right; font-size: 16px; }

.group-card { background: var(--panel-2); border-radius: var(--radius); padding: 18px; margin-bottom: 12px; }
.group-card .gc-head { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.group-card .gc-head h5 { flex: 1; margin: 0; font-size: 15px; font-weight: 800; }
.group-card .gc-students { display: flex; flex-wrap: wrap; gap: 8px; }
.group-chip { font-size: 13px; padding: 6px 14px; border-radius: 99px; background: var(--panel); color: var(--text); display: inline-flex; align-items: center; gap: 8px; transition: var(--trans-fast); border: 1px solid var(--border-soft); font-weight: 700; }
.group-chip:hover { border-color: var(--accent); }
.group-chip button { background: transparent; border: none; padding: 0; color: var(--text-3); cursor: pointer; font-size: 15px; line-height: 1; font-weight: 700; }
.group-chip button:hover { color: var(--err); }

.modal-overlay { position: fixed; inset: 0; background: rgba(0, 0, 0, .8); backdrop-filter: blur(8px); z-index: 200; display: flex; align-items: center; justify-content: center; padding: 20px; }
.modal-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius-xl); max-width: 560px; width: 100%; max-height: 90vh; overflow-y: auto; box-shadow: var(--shadow-lg); }

.tg-link { display: inline-flex; align-items: center; gap: 10px; margin-top: 14px; padding: 14px 22px; background: #229ED9; color: #fff; border-radius: var(--radius); text-decoration: none; font-weight: 800; font-size: 14.5px; border: none; cursor: pointer; transition: var(--trans); }
.tg-link:hover { background: #1d8dc0; transform: translateY(-2px); box-shadow: var(--shadow); }
.theme-picker { display: flex; gap: 12px; }
.theme-option { flex: 1; padding: 18px; background: var(--panel-2); border: 1.5px solid var(--border-soft); border-radius: var(--radius); color: var(--text); font-size: 14px; cursor: pointer; transition: var(--trans); font-weight: 700; }
.theme-option:hover { border-color: var(--accent); }
.theme-option.active { border-color: var(--accent); background: var(--accent-soft); }
.palette-picker { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 14px; }
.palette-option { aspect-ratio: 1; border-radius: 18px; border: 3px solid transparent; cursor: pointer; transition: var(--trans); }
.palette-option:hover { transform: scale(1.06); }
.palette-option.active { border-color: var(--text); box-shadow: 0 0 0 4px var(--accent-soft); }
.palette-option[data-pal="orange"] { background: #ff6b1f; }
.palette-option[data-pal="blue"] { background: #3b82f6; }
.palette-option[data-pal="violet"] { background: #a855f7; }
.palette-option[data-pal="emerald"] { background: #10b981; }

.social-login { margin-top: 28px; width: 100%; }
.social-divider { display: flex; align-items: center; gap: 16px; color: var(--text-3); font-size: 12.5px; margin: 16px 0 22px; font-weight: 700; }
.social-divider::before, .social-divider::after { content: ""; flex: 1; height: 1px; background: var(--border-soft); }
.social-buttons { display: flex; flex-direction: column; gap: 12px; align-items: center; }
.social-btn-fixed { width: 280px; height: 48px; display: flex; align-items: center; justify-content: center; overflow: hidden; border-radius: var(--radius); }
.social-btn-fixed iframe, .social-btn-fixed > div, .social-btn-fixed * { max-width: 280px !important; box-shadow: none !important; }

/* BOOKS */
.book-card { background: var(--panel); border-radius: var(--radius-lg); padding: 20px; display: flex; flex-direction: column; gap: 16px; transition: var(--trans); border: 1px solid var(--border-soft); cursor: pointer; }
.book-card:hover { border-color: var(--border); transform: translateY(-4px); box-shadow: var(--shadow); }
.book-cover { width: 100%; height: 200px; border-radius: var(--radius); background: var(--accent-soft); display: flex; align-items: center; justify-content: center; overflow: hidden; background-size: cover; background-position: center; }
.book-cover-fallback { font-size: 64px; font-weight: 900; color: var(--accent); text-transform: uppercase; }
.book-title { font-weight: 900; font-size: 17px; margin-bottom: 4px; line-height: 1.3; }
.book-author { font-size: 13.5px; color: var(--text-2); margin-bottom: 10px; }
.book-meta { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.book-desc { font-size: 13.5px; color: var(--text-2); line-height: 1.55; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.book-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: auto; }
.book-list-row { display: flex; align-items: center; gap: 20px; padding: 18px 22px; background: var(--panel); border-radius: var(--radius); margin-bottom: 10px; transition: var(--trans); border: 1px solid var(--border-soft); cursor: pointer; }
.book-list-row:hover { border-color: var(--border); background: var(--panel-2); }
.book-list-row .blc-cover { width: 60px; height: 90px; flex: none; border-radius: 8px; background: var(--accent-soft); display: flex; align-items: center; justify-content: center; font-size: 24px; font-weight: 900; color: var(--accent); background-size: cover; background-position: center; text-transform: uppercase; }
.book-list-row .binfo { flex: 1; min-width: 0; }
.book-list-row .btitle { font-weight: 800; font-size: 16px; }
.book-list-row .bauthor { font-size: 13px; color: var(--text-2); margin-top: 2px; }

/* BOOK UPLOAD FORM */
.book-form-grid { display: grid; grid-template-columns: 220px 1fr; gap: 24px; margin-bottom: 20px; }
@media (max-width: 720px) { .book-form-grid { grid-template-columns: 1fr; gap: 18px; } }
.book-cover-upload { position: relative; aspect-ratio: 2 / 3; border-radius: var(--radius-lg); border: 2px dashed var(--border); background: var(--bg-soft); display: flex; align-items: center; justify-content: center; cursor: pointer; overflow: hidden; transition: var(--trans); }
.book-cover-upload:hover, .book-cover-upload.drag { border-color: var(--accent); background: var(--accent-soft); }
.book-cover-upload .bcu-preview { width: 100%; height: 100%; background-size: cover; background-position: center; display: flex; align-items: center; justify-content: center; }
.book-cover-upload .bcu-empty, .book-pdf-drop .bpd-empty { text-align: center; color: var(--text-2); padding: 16px; display: flex; flex-direction: column; gap: 4px; align-items: center; }
.book-cover-upload .bcu-empty svg, .book-pdf-drop .bpd-empty svg { width: 42px; height: 42px; stroke: var(--accent); opacity: .75; margin-bottom: 8px; }
.book-cover-upload .bcu-empty b, .book-pdf-drop .bpd-empty b { font-size: 14.5px; color: var(--text); }
.book-cover-upload .bcu-empty span, .book-pdf-drop .bpd-empty span { font-size: 12.5px; }
.book-cover-upload .bcu-hint, .book-pdf-drop .bcu-hint { font-size: 11.5px; color: var(--text-3); margin-top: 4px; }
.book-cover-upload .bcu-clear, .book-pdf-drop .bcu-clear { position: absolute; top: 8px; right: 8px; width: 32px; height: 32px; border-radius: 50%; border: none; background: rgba(0,0,0,.72); color: #fff; font-size: 13px; cursor: pointer; padding: 0; display: flex; align-items: center; justify-content: center; transition: var(--trans-fast); z-index: 2; }
.book-cover-upload .bcu-clear:hover, .book-pdf-drop .bcu-clear:hover { background: var(--err); }
.book-fields { display: flex; flex-direction: column; }
.book-fields label { margin: 0 0 10px; }
.book-fields label:last-child { margin-bottom: 0; }
.book-pdf-drop { position: relative; border-radius: var(--radius-lg); border: 2px dashed var(--border); background: var(--bg-soft); padding: 28px 24px; text-align: center; cursor: pointer; transition: var(--trans); min-height: 130px; display: flex; align-items: center; justify-content: center; }
.book-pdf-drop:hover, .book-pdf-drop.drag { border-color: var(--accent); background: var(--accent-soft); }
.book-pdf-drop.has-file { border-style: solid; border-color: var(--accent); background: var(--accent-soft); }
.book-pdf-drop .bpd-preview { width: 100%; }
.book-pdf-drop .bpd-meta { display: flex; gap: 14px; align-items: center; justify-content: center; font-size: 14px; font-weight: 700; }
.book-pdf-drop .bpd-meta svg { width: 32px; height: 32px; stroke: var(--accent); }
.book-pdf-drop .bpd-meta .bpd-name { color: var(--text); font-weight: 800; }
.book-pdf-drop .bpd-meta .bpd-size { color: var(--text-2); font-weight: 600; font-size: 13px; }

/* ==========================================================
   READER — ГОРИЗОНТАЛЬНОЕ ЛИСТАНИЕ
   ========================================================== */
#view-reader {
  position: fixed;
  inset: 0;
  z-index: 150;
  background: var(--bg);
  display: none;
  flex-direction: column;
  overflow: hidden;
}
#view-reader.active { display: flex !important; }

body.reader-mode #topbar,
body.reader-mode #toTop,
body.reader-mode #supportBtn,
body.reader-mode #mobile-nav { display: none !important; }
body.reader-mode main { padding: 0 !important; }

.reader-topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border-soft);
  flex: none;
  transition: transform .28s ease, opacity .28s ease;
  z-index: 20;
}
.reader-topbar.hidden-ui { transform: translateY(-100%); opacity: 0; pointer-events: none; }

.reader-title {
  flex: 1; text-align: center;
  font-weight: 800; font-size: 15px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  color: var(--text-2);
}
.reader-actions { display: flex; gap: 4px; align-items: center; }
.reader-actions .icon-btn { width: 38px; height: 38px; }
.reader-zoom-val {
  font-size: 12.5px; font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--text-2); min-width: 44px; text-align: center;
}

.reader-progress {
  height: 3px; background: var(--border-soft);
  flex: none;
  position: relative;
  z-index: 19;
  transition: opacity .28s ease;
}
.reader-progress.hidden-ui { opacity: 0; }
.reader-progress-fill {
  height: 100%; width: 0; background: var(--accent);
  transition: width .25s ease;
}

.reader-stage {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 1200px;
  touch-action: pan-y;
}
.reader-page-slot {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  will-change: transform, opacity;
  transform: translateX(0);
  transition: transform .32s cubic-bezier(.32, .72, .25, 1);
  backface-visibility: hidden;
}
.reader-page-slot.hidden { opacity: 0; pointer-events: none; }
.reader-page-slot canvas {
  max-width: 100%;
  max-height: 100%;
  border-radius: 4px;
  box-shadow: 0 12px 40px -14px rgba(0,0,0,.7);
  background: #fff;
  display: block;
  object-fit: contain;
}
[data-theme="light"] .reader-page-slot canvas {
  box-shadow: 0 12px 36px -16px rgba(0,0,0,.2);
}

.reader-page-loading {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-3); font-size: 14px; font-weight: 700;
  z-index: 5; pointer-events: none;
}
.reader-page-loading[hidden] { display: none !important; }

.reader-page-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 54px; height: 88px;
  border-radius: 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  z-index: 25;
  box-shadow: var(--shadow);
  transition: var(--trans);
  opacity: .35;
  padding: 0;
}
.reader-page-nav:hover { opacity: 1; background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.reader-page-nav:disabled { opacity: 0; pointer-events: none; }
.reader-page-nav svg { width: 26px; height: 26px; }
.reader-page-nav.prev { left: 16px; }
.reader-page-nav.next { right: 16px; }

.reader-page-indicator {
  position: absolute; bottom: 18px; left: 50%;
  transform: translateX(-50%);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 8px 18px;
  font-size: 13px; font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--text-2);
  box-shadow: var(--shadow);
  z-index: 25;
  user-select: none;
  transition: opacity .28s ease;
}
.reader-page-indicator.hidden-ui { opacity: 0; }

.reader-hint {
  position: absolute; bottom: 60px; left: 50%;
  transform: translateX(-50%);
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text-2);
  padding: 8px 16px; border-radius: 99px;
  font-size: 12.5px; font-weight: 700;
  z-index: 26;
  pointer-events: none;
  animation: fade-up .4s ease;
}
@keyframes fade-up { from { opacity: 0; transform: translateX(-50%) translateY(8px); } to { opacity: 1; transform: translateX(-50%) translateY(0); } }

.reader-toc-panel, .reader-bookmarks-panel {
  position: fixed; top: 68px; right: 20px;
  width: 340px; max-width: calc(100vw - 40px);
  max-height: calc(100vh - 100px);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 200;
  overflow: hidden;
  display: flex; flex-direction: column;
  animation: menu-in .22s cubic-bezier(.34, 1.56, .64, 1);
}
.reader-toc-head {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-soft);
  display: flex; align-items: center; justify-content: space-between;
}
.reader-toc-head b { font-size: 15px; font-weight: 800; }
.reader-toc-list { overflow-y: auto; padding: 8px; }
.reader-toc-item {
  display: block; padding: 10px 16px;
  border-radius: 8px;
  color: var(--text); font-size: 14px; font-weight: 600;
  cursor: pointer; transition: var(--trans-fast);
  border: none; background: transparent; width: 100%; text-align: left;
  font-family: inherit;
}
.reader-toc-item:hover { background: var(--panel-2); color: var(--accent); }
.reader-toc-item.lvl-2 { padding-left: 28px; font-weight: 500; font-size: 13px; color: var(--text-2); }
.reader-toc-item.lvl-3 { padding-left: 44px; font-weight: 400; font-size: 12.5px; color: var(--text-3); }

.bookmark-item {
  background: var(--panel-2); border-radius: 10px;
  padding: 12px 14px; margin-bottom: 8px;
  display: flex; align-items: flex-start; gap: 10px;
  cursor: pointer;
}
.bookmark-item .bm-body { flex: 1; }
.bookmark-item .bm-pos { font-size: 11.5px; color: var(--accent); font-weight: 800; }
.bookmark-item .bm-note { font-size: 13px; margin-top: 4px; color: var(--text); }
.bookmark-item button { background: transparent; border: none; color: var(--text-3); cursor: pointer; font-size: 16px; padding: 0; line-height: 1; }
.bookmark-item button:hover { color: var(--err); }

/* ADMIN */
.admin-row { display: flex; align-items: center; gap: 16px; padding: 18px 22px; background: var(--panel-2); border-radius: var(--radius); margin-bottom: 10px; flex-wrap: wrap; }
.admin-row .info { flex: 1; min-width: 240px; }
.admin-row .info b { font-size: 15px; font-weight: 800; }
.admin-row select { padding: 10px 14px; margin: 0; width: auto; font-size: 13.5px; font-weight: 700; }
.stat-card { background: var(--panel); border-radius: var(--radius-lg); padding: 22px 24px; display: flex; flex-direction: column; border: 1px solid var(--border-soft); transition: var(--trans); }
.stat-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.stat-value { font-size: 32px; font-weight: 900; letter-spacing: -0.04em; line-height: 1; margin-bottom: 8px; }
.stat-label { font-size: 11px; color: var(--text-3); text-transform: uppercase; letter-spacing: 1.5px; font-weight: 800; }
.progress-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.progress-table th, .progress-table td { padding: 16px; text-align: left; border-bottom: 1px solid var(--border-soft); }
.progress-table th { color: var(--text-3); font-weight: 800; font-size: 11.5px; text-transform: uppercase; letter-spacing: 1px; }
.progress-table tr:hover td { background: var(--panel-2); }
.chart-wrap { background: var(--bg-soft); border-radius: var(--radius); padding: 24px; margin-bottom: 20px; overflow: hidden; border: 1px solid var(--border-soft); }
.chart-bars { display: flex; align-items: flex-end; gap: 8px; height: 220px; padding: 12px 0 32px; overflow-x: auto; }
.chart-bar { flex: 1; min-width: 28px; border-radius: 8px 8px 0 0; transition: var(--trans); position: relative; cursor: pointer; }
.chart-bar::after { content: attr(data-label); position: absolute; bottom: -24px; left: 50%; transform: translateX(-50%); font-size: 11px; color: var(--text-3); white-space: nowrap; font-weight: 700; }
.log-row { display: flex; align-items: flex-start; gap: 16px; padding: 14px 20px; background: var(--panel-2); border-radius: var(--radius); margin-bottom: 8px; font-size: 14px; }
.log-row .log-time { font-size: 12px; color: var(--text-3); flex: none; min-width: 120px; font-weight: 700; }
.log-row .log-who { font-weight: 900; flex: none; min-width: 140px; }
.log-row .log-action { flex: 1; }
.log-row .log-details { color: var(--text-2); font-size: 13px; margin-top: 4px; }
.backup-row { display: flex; align-items: center; gap: 16px; padding: 18px 22px; background: var(--panel-2); border-radius: var(--radius); margin-bottom: 10px; flex-wrap: wrap; }
.backup-row .bi-info { flex: 1; min-width: 240px; }
.backup-row .bi-info b { font-size: 14.5px; font-weight: 800; }
.csv-result-block { background: var(--panel-2); border-radius: var(--radius); padding: 20px; margin-bottom: 14px; }
.csv-result-block h4 { margin: 0 0 14px; font-size: 16px; font-weight: 900; }

/* DASH */
.dash-summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin-bottom: 28px; }
.dash-summary .dash-item { background: var(--panel); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 20px; position: relative; overflow: hidden; transition: var(--trans); display: flex; flex-direction: column; gap: 4px; }
.dash-summary .dash-item:hover { border-color: var(--accent); transform: translateY(-3px); }
.dash-summary .dash-item .di-label { font-size: 10.5px; color: var(--text-3); text-transform: uppercase; letter-spacing: 1.4px; font-weight: 800; margin-bottom: 6px; }
.dash-summary .dash-item .di-value { font-size: 28px; font-weight: 900; letter-spacing: -0.04em; line-height: 1; font-variant-numeric: tabular-nums; }
.dash-summary .dash-item .di-value.accent { color: var(--accent); }
.dash-summary .dash-item .di-icon { position: absolute; top: 18px; right: 18px; width: 32px; height: 32px; border-radius: 10px; background: var(--accent-soft); display: flex; align-items: center; justify-content: center; color: var(--accent); }
.dash-summary .dash-item .di-icon svg { width: 16px; height: 16px; }
.quick-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px; }
.quick-actions .qa-btn { display: flex; align-items: center; gap: 12px; padding: 14px 20px; background: var(--panel); border: 1px solid var(--border-soft); border-radius: var(--radius); cursor: pointer; transition: var(--trans); font-weight: 700; font-size: 14px; color: var(--text); }
.quick-actions .qa-btn:hover { background: var(--panel-2); border-color: var(--accent); transform: translateY(-2px); }
.quick-actions .qa-btn .qa-icon { width: 34px; height: 34px; border-radius: 11px; background: var(--accent-soft); color: var(--accent); display: flex; align-items: center; justify-content: center; flex: none; }
.quick-actions .qa-btn .qa-icon svg { width: 18px; height: 18px; }

/* SCHEDULE */
.schedule-block { background: var(--panel); border-radius: var(--radius-lg); padding: 24px 28px; margin-bottom: 28px; border: 1px solid var(--border-soft); }
.schedule-title { font-size: 18px; font-weight: 900; margin-bottom: 18px; display: flex; align-items: center; gap: 10px; }
.schedule-title svg { width: 20px; height: 20px; color: var(--accent); }
.schedule-list { display: flex; gap: 14px; overflow-x: auto; padding-bottom: 8px; }
.schedule-card { flex: 0 0 auto; width: 280px; background: var(--bg-soft); border-radius: var(--radius); padding: 18px 20px; border: 1px solid var(--border-soft); transition: var(--trans); cursor: pointer; }
.schedule-card:hover { border-color: var(--accent); }
.schedule-card.overdue { opacity: .6; }
.schedule-card .sc-class { font-size: 11.5px; color: var(--accent); text-transform: uppercase; letter-spacing: 1.4px; font-weight: 800; margin-bottom: 8px; }
.schedule-card .sc-title { font-size: 15px; font-weight: 800; line-height: 1.3; margin-bottom: 12px; }
.schedule-card .sc-deadline { font-size: 12.5px; color: var(--text-2); display: flex; align-items: center; gap: 6px; font-weight: 600; }
.schedule-card .sc-deadline svg { width: 14px; height: 14px; }
.schedule-card.overdue .sc-deadline { color: var(--err); }
.schedule-card .sc-deadline.urgent { color: var(--warn); }

/* RATING */
.rating-podium { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; margin-bottom: 32px; align-items: end; }
@media (max-width: 640px) { .rating-podium { grid-template-columns: 1fr; } }
.podium-item { background: var(--panel); border-radius: var(--radius-lg); padding: 24px 20px; text-align: center; border: 1px solid var(--border-soft); transition: var(--trans); }
.podium-item.first { padding-top: 32px; padding-bottom: 32px; border-color: rgba(255,181,71,.5); }
.podium-medal { font-size: 44px; line-height: 1; margin-bottom: 14px; }
.podium-avatar { width: 64px; height: 64px; border-radius: 50%; margin: 0 auto 12px; background: var(--accent); color: var(--accent-text); display: flex; align-items: center; justify-content: center; font-size: 24px; font-weight: 900; background-size: cover; background-position: center; }
.podium-name { font-size: 15px; font-weight: 800; margin-bottom: 6px; }
.podium-score { font-size: 22px; font-weight: 900; color: var(--accent); font-variant-numeric: tabular-nums; }
.podium-label { font-size: 11px; color: var(--text-3); text-transform: uppercase; letter-spacing: 1.5px; font-weight: 800; margin-top: 4px; }
.rating-row { display: flex; align-items: center; gap: 14px; padding: 12px 18px; background: var(--panel-2); border-radius: var(--radius); margin-bottom: 6px; }
.rating-row.me { border: 1px solid var(--accent); background: var(--accent-soft); }
.rating-row .rr-rank { font-weight: 900; font-size: 14px; color: var(--text-3); min-width: 28px; }
.rating-row .rr-name { flex: 1; font-weight: 700; font-size: 14.5px; }
.rating-row .rr-score { font-weight: 900; font-size: 16px; color: var(--accent); }

/* ANALYTICS */
.analytics-grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); margin-bottom: 28px; }
.analytics-kpi { background: var(--panel); border-radius: var(--radius-lg); padding: 24px 28px; border: 1px solid var(--border-soft); }
.analytics-kpi .ak-label { font-size: 11px; color: var(--text-3); text-transform: uppercase; letter-spacing: 1.5px; font-weight: 800; margin-bottom: 10px; }
.analytics-kpi .ak-value { font-size: 40px; font-weight: 900; letter-spacing: -0.04em; line-height: 1; }
.analytics-kpi .ak-value.accent { color: var(--accent); }
.hard-task-row { display: flex; align-items: center; gap: 14px; padding: 14px 18px; background: var(--panel-2); border-radius: var(--radius); margin-bottom: 8px; border-left: 3px solid var(--err); }
.hard-task-row.warn { border-left-color: var(--warn); }
.hard-task-row.ok { border-left-color: var(--ok); }
.hard-task-row .ht-body { flex: 1; min-width: 0; }
.hard-task-row .ht-stmt { font-size: 13.5px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; margin-bottom: 6px; font-family: ui-monospace, monospace; }
.hard-task-row .ht-bar { height: 6px; background: var(--bg); border-radius: 99px; overflow: hidden; }
.hard-task-row .ht-fill { height: 100%; border-radius: 99px; }
.hard-task-row .ht-pct { font-weight: 900; font-size: 16px; min-width: 60px; text-align: right; }
.analytics-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.analytics-table th, .analytics-table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border-soft); }
.analytics-table th { color: var(--text-3); font-weight: 800; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; }
.analytics-table tr:hover td { background: var(--panel-2); }
.analytics-table .cell-num { font-variant-numeric: tabular-nums; font-weight: 800; text-align: right; }

/* CHAT */
.chat-box { display: flex; flex-direction: column; height: 500px; background: var(--bg-soft); border-radius: var(--radius-lg); padding: 20px; border: 1px solid var(--border-soft); }
.chat-messages { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 14px; padding-right: 8px; margin-bottom: 14px; }
.chat-msg { display: flex; gap: 12px; max-width: 78%; }
.chat-msg.own { align-self: flex-end; flex-direction: row-reverse; }
.chat-msg .avatar { width: 38px; height: 38px; font-size: 14px; }
.chat-msg-body { background: var(--panel-2); border-radius: 18px; padding: 12px 16px; min-width: 0; position: relative; border: 1px solid var(--border-soft); }
.chat-msg.own .chat-msg-body { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.chat-msg-head { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; font-size: 12px; color: var(--text-3); font-weight: 600; }
.chat-msg.own .chat-msg-head { color: rgba(255,255,255,.75); }
.chat-msg-head b { color: var(--text); font-size: 14px; font-weight: 800; }
.chat-msg-text { font-size: 14.5px; word-break: break-word; white-space: pre-wrap; line-height: 1.55; }
.chat-msg-file { margin-top: 10px; padding: 10px 14px; background: rgba(255,255,255,.08); border-radius: 12px; display: inline-flex; align-items: center; gap: 10px; font-size: 13.5px; cursor: pointer; font-weight: 700; }
.chat-msg-del { position: absolute; top: 8px; right: 10px; background: transparent; border: none; color: var(--text-3); cursor: pointer; padding: 4px 8px; font-size: 13px; border-radius: 8px; opacity: 0; transition: var(--trans-fast); }
.chat-msg:hover .chat-msg-del { opacity: 1; }
.chat-msg-del:hover { color: var(--err); background: rgba(239,68,68,.1); }
.chat-input-row { display: flex; gap: 10px; align-items: center; }
.chat-input-row input[type=text], .chat-input-row #chatText { flex: 1; margin: 0; padding: 14px 20px; font-size: 15px; }

/* SUPPORT */
#supportBtn { position: fixed; bottom: 32px; left: 32px; width: 64px; height: 64px; border-radius: 50%; background: var(--accent); color: var(--accent-text); border: none; cursor: pointer; box-shadow: var(--shadow-lg); display: flex; align-items: center; justify-content: center; z-index: 90; transition: var(--trans); padding: 0; }
#supportBtn:hover { transform: scale(1.08) rotate(-8deg); background: var(--accent-hover); }
#supportBtn svg { width: 28px; height: 28px; }
#supportBtn .support-badge { position: absolute; top: 3px; right: 3px; width: 16px; height: 16px; border-radius: 50%; background: var(--ok); border: 3px solid var(--bg); }
#supportPanel { position: fixed; bottom: 108px; left: 32px; width: 420px; max-width: calc(100vw - 48px); height: 600px; max-height: calc(100vh - 160px); background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius-xl); box-shadow: var(--shadow-lg); z-index: 95; display: flex; flex-direction: column; overflow: hidden; }
.support-head { padding: 22px 24px; border-bottom: 1px solid var(--border-soft); display: flex; align-items: center; gap: 14px; background: var(--panel-2); }
.support-head .support-avatar { width: 46px; height: 46px; border-radius: 50%; background: var(--accent); color: var(--accent-text); display: flex; align-items: center; justify-content: center; font-size: 20px; flex: none; }
.support-head .support-info { flex: 1; min-width: 0; }
.support-head .support-info b { font-size: 15.5px; display: block; margin-bottom: 2px; font-weight: 800; }
.support-head .support-info .muted { font-size: 12.5px; color: var(--ok); font-weight: 700; }
.support-close { width: 36px; height: 36px; border-radius: 10px; background: transparent; border: none; color: var(--text-3); cursor: pointer; padding: 0; display: flex; align-items: center; justify-content: center; }
.support-close svg { width: 18px; height: 18px; }
.support-close:hover { background: var(--panel); color: var(--text); }
.support-messages { flex: 1; overflow-y: auto; padding: 20px 24px; display: flex; flex-direction: column; gap: 14px; }
.support-msg { max-width: 82%; padding: 12px 16px; border-radius: 16px; font-size: 14px; line-height: 1.55; font-weight: 500; }
.support-msg.from-user { align-self: flex-end; background: var(--accent); color: var(--accent-text); border-bottom-right-radius: 4px; }
.support-msg.from-bot { align-self: flex-start; background: var(--panel-2); border: 1px solid var(--border-soft); border-bottom-left-radius: 4px; }
.support-msg .time { font-size: 11px; opacity: .65; margin-top: 6px; display: block; font-weight: 600; }
.support-quick { display: flex; flex-wrap: wrap; gap: 8px; padding: 0 24px 14px; }
.support-quick button { font-size: 13px; padding: 9px 16px; background: var(--panel-2); border-color: var(--border-soft); font-weight: 700; }
.support-quick button:hover { border-color: var(--accent); color: var(--accent); }
.support-input-row { padding: 14px 20px; border-top: 1px solid var(--border-soft); display: flex; gap: 10px; background: var(--panel-2); }
.support-input-row input { flex: 1; margin: 0; padding: 13px 18px; font-size: 14.5px; }

/* EDIT PROFILE */
.edit-page-title { font-size: clamp(24px, 3.5vw, 38px); font-weight: 900; letter-spacing: -0.03em; line-height: 1.1; }
.edit-card { background: var(--panel); border: 1px solid var(--border-soft); border-radius: var(--radius-lg); padding: 36px 32px 28px; max-width: 820px; margin: 0 auto; }
.edit-row { display: grid; grid-template-columns: 180px 1fr; gap: 36px; align-items: start; }
@media (max-width: 720px) { .edit-row { grid-template-columns: 1fr; gap: 22px; } .edit-card { padding: 22px 18px 20px; } }
.edit-avatar-wrap { display: flex; flex-direction: column; align-items: center; gap: 14px; text-align: center; }
.edit-avatar { width: 148px; height: 148px; border-radius: 50%; background: var(--panel-2); color: var(--text-3); font-size: 54px; font-weight: 900; display: flex; align-items: center; justify-content: center; background-size: cover; background-position: center; border: 3px solid var(--border); transition: var(--trans); box-shadow: 0 6px 24px -14px rgba(0,0,0,.6); }
.edit-avatar-wrap:hover .edit-avatar { border-color: var(--accent); }
.edit-upload-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 18px; font-size: 13.5px; font-weight: 700; border-radius: var(--radius); border: 1.5px solid var(--border); background: var(--panel-2); color: var(--text); cursor: pointer; transition: var(--trans); font-family: inherit; }
.edit-upload-btn:hover { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }
.edit-upload-btn svg { width: 16px; height: 16px; }
.edit-hint { font-size: 11.5px; color: var(--text-3); font-weight: 600; line-height: 1.5; }
.edit-fields { display: flex; flex-direction: column; gap: 20px; }
.edit-field { display: flex; flex-direction: column; }
.edit-field label { display: block; margin: 0 0 8px; font-size: 11.5px; font-weight: 800; color: var(--text-2); letter-spacing: 1.4px; text-transform: uppercase; }
.edit-field input { display: block; width: 100%; margin: 0; padding: 14px 18px; border-radius: var(--radius); border: 1.5px solid var(--border); background: var(--bg-soft); color: var(--text); font-family: inherit; font-size: 15px; font-weight: 500; transition: var(--trans); outline: none; box-sizing: border-box; }
.edit-field input:focus { border-color: var(--accent); background: var(--panel-2); box-shadow: 0 0 0 4px var(--accent-soft); }
.edit-actions { display: flex; justify-content: flex-end; gap: 12px; margin-top: 30px; padding-top: 22px; border-top: 1px solid var(--border-soft); }
@media (max-width: 720px) { .edit-actions { flex-direction: column-reverse; gap: 8px; } .edit-actions button { width: 100%; justify-content: center; } }

/* MOBILE NAV */
#mobile-nav { display: none; position: fixed; bottom: 0; left: 0; right: 0; background: rgba(8, 8, 10, .95); backdrop-filter: blur(24px) saturate(180%); border-top: 1px solid var(--border-soft); padding: 10px 8px calc(10px + env(safe-area-inset-bottom)); z-index: 80; }
[data-theme="light"] #mobile-nav { background: rgba(255,255,255,.95); }
#mobile-nav .mn-inner { display: flex; justify-content: space-around; align-items: center; max-width: 500px; margin: 0 auto; gap: 4px; }
#mobile-nav button { flex: 1; background: transparent; border: none; color: var(--text-3); flex-direction: column; gap: 4px; padding: 10px 6px; font-size: 10.5px; font-weight: 800; border-radius: 12px; }
#mobile-nav button svg { width: 22px; height: 22px; }
#mobile-nav button.active { color: var(--accent); background: var(--accent-soft); }

/* MOBILE ADAPT */
@media (max-width: 720px) {
  main { padding: 32px 18px 120px; }
  #topbar { padding: 12px 16px; gap: 6px; }
  .brand span:not(.sigma) { display: none; }
  .user-chip .chip-name { max-width: 90px; font-size: 13px; }
  .user-chip .chip-role { display: none; }
  .user-menu { min-width: 260px; }
  h1 { font-size: 40px; }
  h2 { font-size: 28px; }
  .page-title { font-size: 36px; }
  .card { padding: 24px; }
  .card h2 { font-size: 24px; }
  .tabs { width: 100%; overflow-x: auto; }
  .toast { min-width: unset; max-width: calc(100vw - 40px); }
  #toasts { left: 20px; right: 20px; top: 90px; }
  .score-circle { --size: 140px; }
  .score-circle .val { font-size: 28px; }
  .notif-panel { left: 12px; right: 12px; width: auto; top: 72px; }
  .chat-box { height: 420px; padding: 14px; }
  .icon-btn { width: 40px; height: 40px; }
  .icon-btn svg { width: 18px; height: 18px; }
  .chat-msg { max-width: 90%; }
  #supportBtn { bottom: 100px; left: 16px; width: 56px; height: 56px; }
  #supportBtn svg { width: 24px; height: 24px; }
  #supportPanel { bottom: 168px; left: 12px; right: 12px; width: auto; height: calc(100vh - 240px); }
  #mobile-nav { display: block; }
  #toTop { bottom: 100px; right: 16px; width: 48px; height: 48px; }
  .landing { padding: 20px 20px 0; }
  .landing-stats-row { gap: 32px; padding: 32px 0 60px; }
  .landing-final { padding: 48px 28px; }
  .landing-cta button { padding: 16px 28px; font-size: 15px; }
  .auth-card { padding: 36px 28px; }
  .auth-title { font-size: 30px; }
  .hero-visual { height: 340px; }
  .hero-visual .formula-card { padding: 14px 18px; font-size: 18px; }
  .hero-visual .big-symbol { font-size: 220px; }
  .take-slider { padding: 12px 16px; gap: 12px; }
  .take-slider .ts-dot { width: 24px; height: 24px; font-size: 11px; }
  .schedule-card { width: 240px; }
  .reader-topbar { padding: 8px 10px; gap: 6px; }
  .reader-topbar .reader-title { font-size: 13px; max-width: 32vw; }
  .reader-actions .icon-btn { width: 34px; height: 34px; }
  .reader-actions .icon-btn svg { width: 16px; height: 16px; }
  .reader-zoom-val { display: none; }
  .reader-page-slot { padding: 8px; }
  .reader-page-nav { width: 40px; height: 70px; opacity: .55; }
  .reader-page-nav svg { width: 20px; height: 20px; }
  .reader-page-nav.prev { left: 6px; }
  .reader-page-nav.next { right: 6px; }
  .reader-page-indicator { bottom: 12px; font-size: 12px; padding: 6px 14px; }
  .reader-toc-panel, .reader-bookmarks-panel { top: 62px; left: 10px; right: 10px; width: auto; max-height: calc(100vh - 80px); }
  .reader-toc-item { padding: 14px 16px; font-size: 15px; }
}
@media (max-width: 480px) {
  .grid { grid-template-columns: 1fr; }
  .stat-value { font-size: 26px; }
  h1 { font-size: 32px; }
  .page-title { font-size: 28px; }
  .dash-summary .dash-item .di-value { font-size: 24px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}
/* Разворот: две страницы рядом */
.reader-page-slot {
  padding: 20px 12px;
}
.reader-spread {
  display: flex;
  gap: 16px;
  justify-content: center;
  align-items: center;
  height: 100%;
  width: 100%;
}
.reader-spread canvas {
  display: block;
  border-radius: 3px;
  box-shadow: 0 12px 40px -14px rgba(0,0,0,.7);
  background: #fff;
  object-fit: contain;
}
[data-theme="light"] .reader-spread canvas {
  box-shadow: 0 12px 36px -16px rgba(0,0,0,.2);
}
.reader-spread.single canvas {
  max-width: 100%;
}
@media (max-width: 720px) {
  .reader-page-slot { padding: 8px 4px; }
  .reader-spread { gap: 6px; }
}