/* ═══════════════════════════════════════════════════════════════════
   LIQUID GLASS — Quizzman Design System
   Inspired by macOS 26 Liquid Glass with rich animations & characters
   v1.0.0 · 2026-03-14
   ═══════════════════════════════════════════════════════════════════ */

/* ─── RESET ─────────────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}

/* ─── DESIGN TOKENS (LIGHT) ─────────────────────────────────────── */
:root,[data-theme="light"]{
  /* surfaces */
  --lq-bg: #ffffff;
  --lq-bg-mesh-1: none;
  --lq-bg-mesh-2: none;
  --lq-bg-mesh-3: none;

  /* glass */
  --lq-glass: rgba(255,255,255,.85);
  --lq-glass-hover: rgba(245,247,250,.90);
  --lq-glass-active: rgba(241,245,249,.95);
  --lq-glass-border: rgba(226,232,240,.60);
  --lq-glass-border-subtle: rgba(226,232,240,.35);
  --lq-glass-blur: 28px;
  --lq-glass-saturate: 1.8;

  /* text */
  --lq-text: #0f172a;
  --lq-text-secondary: #475569;
  --lq-text-tertiary: #94a3b8;
  --lq-text-inverse: #ffffff;

  /* accents */
  --lq-accent: #2563eb;
  --lq-accent-hover: #1d4ed8;
  --lq-accent-light: rgba(37,99,235,.10);
  --lq-accent-glow: rgba(37,99,235,.18);
  --lq-success: #10b981;
  --lq-success-light: rgba(16,185,129,.12);
  --lq-warning: #f59e0b;
  --lq-warning-light: rgba(245,158,11,.12);
  --lq-danger: #ef4444;
  --lq-danger-light: rgba(239,68,68,.12);
  --lq-info: #3b82f6;
  --lq-info-light: rgba(59,130,246,.12);

  /* depth */
  --lq-shadow-sm: 0 1px 3px rgba(0,0,0,.04), 0 1px 2px rgba(0,0,0,.03);
  --lq-shadow: 0 4px 16px rgba(0,0,0,.06), 0 1px 3px rgba(0,0,0,.04);
  --lq-shadow-lg: 0 12px 40px rgba(0,0,0,.08), 0 4px 12px rgba(0,0,0,.04);
  --lq-shadow-xl: 0 24px 60px rgba(0,0,0,.1), 0 8px 24px rgba(0,0,0,.06);
  --lq-shadow-glow: 0 0 40px rgba(37,99,235,.10);
  --lq-shadow-float: 0 20px 50px rgba(0,0,0,.12), 0 0 0 1px rgba(255,255,255,.2);

  /* shapes */
  --lq-radius-sm: 10px;
  --lq-radius: 16px;
  --lq-radius-lg: 24px;
  --lq-radius-xl: 32px;
  --lq-radius-pill: 999px;

  /* motion */
  --lq-spring: cubic-bezier(.22,1,.36,1);
  --lq-bounce: cubic-bezier(.34,1.56,.64,1);
  --lq-smooth: cubic-bezier(.4,0,.2,1);
  --lq-snappy: cubic-bezier(.2,.8,.2,1);
  --lq-dur-fast: .15s;
  --lq-dur: .3s;
  --lq-dur-slow: .5s;
  --lq-dur-slower: .8s;

  /* spacing */
  --lq-space-xs: 4px;
  --lq-space-sm: 8px;
  --lq-space-md: 16px;
  --lq-space-lg: 24px;
  --lq-space-xl: 32px;
  --lq-space-2xl: 48px;
  --lq-space-3xl: 64px;

  /* font */
  --lq-font: 'Inter','SF Pro Display',system-ui,-apple-system,sans-serif;
  --lq-font-mono: 'SF Mono','JetBrains Mono','Fira Code',monospace;

  /* sidebar */
  --lq-sidebar-w: 280px;
  --lq-sidebar-w-collapsed: 72px;

  /* character accent */
  --lq-char-primary: #2563eb;
  --lq-char-secondary: #0ea5e9;
  --lq-char-eye: #0f172a;
}

/* ─── DESIGN TOKENS (DARK) ──────────────────────────────────────── */
[data-theme="dark"]{
  --lq-bg: #0b1120;
  --lq-bg-mesh-1: radial-gradient(ellipse 80% 60% at 10% 20%, rgba(37,99,235,.10), transparent);
  --lq-bg-mesh-2: radial-gradient(ellipse 60% 50% at 90% 80%, rgba(59,130,246,.08), transparent);
  --lq-bg-mesh-3: radial-gradient(ellipse 40% 40% at 50% 50%, rgba(99,102,241,.04), transparent);

  --lq-glass: rgba(255,255,255,.04);
  --lq-glass-hover: rgba(255,255,255,.08);
  --lq-glass-active: rgba(255,255,255,.12);
  --lq-glass-border: rgba(255,255,255,.08);
  --lq-glass-border-subtle: rgba(255,255,255,.04);

  --lq-text: #e2e8f0;
  --lq-text-secondary: #94a3b8;
  --lq-text-tertiary: #64748b;
  --lq-text-inverse: #0b1120;

  --lq-accent: #60a5fa;
  --lq-accent-hover: #93c5fd;
  --lq-accent-light: rgba(96,165,250,.12);
  --lq-accent-glow: rgba(96,165,250,.15);

  --lq-shadow-sm: 0 1px 3px rgba(0,0,0,.3);
  --lq-shadow: 0 4px 16px rgba(0,0,0,.4);
  --lq-shadow-lg: 0 12px 40px rgba(0,0,0,.5);
  --lq-shadow-xl: 0 24px 60px rgba(0,0,0,.6);
  --lq-shadow-glow: 0 0 40px rgba(96,165,250,.12);
  --lq-shadow-float: 0 20px 50px rgba(0,0,0,.5), 0 0 0 1px rgba(255,255,255,.05);

  --lq-char-primary: #60a5fa;
  --lq-char-secondary: #38bdf8;
  --lq-char-eye: #e2e8f0;
}

/* ─── BASE ──────────────────────────────────────────────────────── */
body.lq{
  font-family: var(--lq-font);
  color: var(--lq-text);
  background: var(--lq-bg);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}
body.lq::before{
  content:'';
  position:fixed;inset:0;z-index:0;pointer-events:none;
  background: var(--lq-bg-mesh-1), var(--lq-bg-mesh-2), var(--lq-bg-mesh-3);
  animation: lq-mesh-drift 30s ease-in-out infinite alternate;
}
@keyframes lq-mesh-drift{
  0%{filter:hue-rotate(0deg)}
  50%{filter:hue-rotate(15deg)}
  100%{filter:hue-rotate(-10deg)}
}

/* ─── GLASS PANELS ──────────────────────────────────────────────── */
.lq-glass{
  background: var(--lq-glass);
  backdrop-filter: blur(var(--lq-glass-blur)) saturate(var(--lq-glass-saturate));
  -webkit-backdrop-filter: blur(var(--lq-glass-blur)) saturate(var(--lq-glass-saturate));
  border: 1px solid var(--lq-glass-border);
  border-radius: var(--lq-radius-lg);
  box-shadow: var(--lq-shadow);
  transition: background var(--lq-dur) var(--lq-spring),
              box-shadow var(--lq-dur) var(--lq-spring),
              transform var(--lq-dur) var(--lq-spring);
}
.lq-glass:hover{
  background: var(--lq-glass-hover);
  box-shadow: var(--lq-shadow-lg);
}
.lq-glass-subtle{
  background: var(--lq-glass);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border: 1px solid var(--lq-glass-border-subtle);
  border-radius: var(--lq-radius);
}
.lq-glass-solid{
  background: var(--lq-glass-active);
  backdrop-filter: blur(40px) saturate(2);
  -webkit-backdrop-filter: blur(40px) saturate(2);
  border: 1px solid var(--lq-glass-border);
  border-radius: var(--lq-radius-lg);
  box-shadow: var(--lq-shadow-lg);
}

/* ─── GLASS CARD ────────────────────────────────────────────────── */
.lq-card{
  position: relative;
  padding: var(--lq-space-lg);
  border-radius: var(--lq-radius-lg);
  background: var(--lq-glass);
  backdrop-filter: blur(var(--lq-glass-blur)) saturate(var(--lq-glass-saturate));
  -webkit-backdrop-filter: blur(var(--lq-glass-blur)) saturate(var(--lq-glass-saturate));
  border: 1px solid var(--lq-glass-border);
  box-shadow: var(--lq-shadow);
  transition: all var(--lq-dur) var(--lq-spring);
  overflow: hidden;
}
.lq-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:1px;
  background: linear-gradient(90deg,transparent,rgba(255,255,255,.4),transparent);
  opacity:.6;
}
.lq-card:hover{
  transform: translateY(-3px);
  box-shadow: var(--lq-shadow-lg), var(--lq-shadow-glow);
}
.lq-card.lq-card--float:hover{
  transform: translateY(-6px) scale(1.01);
  box-shadow: var(--lq-shadow-float);
}

/* ─── LAYOUT ────────────────────────────────────────────────────── */
.lq-page{position:relative;z-index:1;min-height:100vh;display:flex;flex-direction:column}
.lq-container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--lq-space-lg)}
.lq-container--narrow{max-width:800px}
.lq-container--wide{max-width:1440px}

.lq-layout{display:flex;min-height:100vh}
.lq-layout__sidebar{
  width: var(--lq-sidebar-w);
  flex-shrink: 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: var(--lq-space-lg) var(--lq-space-md);
  background: var(--lq-glass);
  backdrop-filter: blur(32px) saturate(1.8);
  -webkit-backdrop-filter: blur(32px) saturate(1.8);
  border-right: 1px solid var(--lq-glass-border-subtle);
  transition: width var(--lq-dur-slow) var(--lq-spring);
  z-index: 100;
}
.lq-layout__main{
  flex: 1;
  min-width: 0;
  padding: var(--lq-space-xl) var(--lq-space-lg);
}

/* ─── HEADER BAR ────────────────────────────────────────────────── */
.lq-topbar{
  display: flex;align-items: center;gap: var(--lq-space-md);
  padding: var(--lq-space-md) var(--lq-space-lg);
  background: var(--lq-glass);
  backdrop-filter: blur(32px) saturate(1.8);
  -webkit-backdrop-filter: blur(32px) saturate(1.8);
  border-bottom: 1px solid var(--lq-glass-border-subtle);
  position: sticky;top: 0;z-index: 200;
}
.lq-topbar__title{font-weight:700;font-size:1.15rem;color:var(--lq-text)}
.lq-topbar__spacer{flex:1}
.lq-topbar__badge{
  font-size:.78rem;font-weight:600;
  padding: 3px 12px;border-radius:var(--lq-radius-pill);
  background: var(--lq-accent-light);
  color: var(--lq-accent);
}

/* ─── TYPOGRAPHY ────────────────────────────────────────────────── */
.lq-h1{font-size:2.2rem;font-weight:800;letter-spacing:-.03em;line-height:1.2;color:var(--lq-text)}
.lq-h2{font-size:1.6rem;font-weight:700;letter-spacing:-.02em;line-height:1.3;color:var(--lq-text)}
.lq-h3{font-size:1.2rem;font-weight:600;line-height:1.4;color:var(--lq-text)}
.lq-body{font-size:.95rem;line-height:1.6;color:var(--lq-text-secondary)}
.lq-caption{font-size:.82rem;color:var(--lq-text-tertiary)}
.lq-mono{font-family:var(--lq-font-mono);font-size:.88rem}
.lq-gradient-text{
  background: linear-gradient(135deg, var(--lq-accent), #38bdf8, #f59e0b);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}

/* ─── BUTTONS ───────────────────────────────────────────────────── */
.lq-btn{
  display: inline-flex;align-items: center;justify-content:center;gap: 8px;
  padding: 10px 22px;
  font-family: var(--lq-font);font-size: .9rem;font-weight: 600;
  border: none;border-radius: var(--lq-radius);
  cursor: pointer;
  transition: all var(--lq-dur) var(--lq-spring);
  position: relative;overflow: hidden;
  text-decoration: none;
}
.lq-btn::after{
  content:'';position:absolute;inset:0;
  background: linear-gradient(180deg,rgba(255,255,255,.15),transparent);
  pointer-events:none;
}
.lq-btn:active{transform:scale(.97)}

/* primary */
.lq-btn--primary{
  background: linear-gradient(135deg, var(--lq-accent), #1d4ed8);
  color: var(--lq-text-inverse);
  box-shadow: 0 4px 14px rgba(37,99,235,.20), inset 0 1px 0 rgba(255,255,255,.15);
}
.lq-btn--primary:hover{
  box-shadow: 0 6px 20px rgba(37,99,235,.30), inset 0 1px 0 rgba(255,255,255,.2);
  transform: translateY(-1px);
}

/* glass */
.lq-btn--glass{
  background: var(--lq-glass);
  backdrop-filter: blur(16px);-webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--lq-glass-border);
  color: var(--lq-text);
}
.lq-btn--glass:hover{
  background: var(--lq-glass-hover);
  box-shadow: var(--lq-shadow);
  transform: translateY(-1px);
}

/* ghost */
.lq-btn--ghost{
  background:transparent;color:var(--lq-text-secondary);
}
.lq-btn--ghost:hover{background:var(--lq-accent-light);color:var(--lq-accent)}

/* sizes */
.lq-btn--sm{padding:6px 14px;font-size:.82rem;border-radius:var(--lq-radius-sm)}
.lq-btn--lg{padding:14px 32px;font-size:1rem;border-radius:var(--lq-radius-lg)}
.lq-btn--icon{width:40px;height:40px;padding:0;border-radius:50%}
.lq-btn--pill{border-radius:var(--lq-radius-pill)}

/* success / danger / warning */
.lq-btn--success{background:linear-gradient(135deg,#10b981,#059669);color:#fff;box-shadow:0 4px 14px rgba(16,185,129,.3)}
.lq-btn--danger{background:linear-gradient(135deg,#ef4444,#dc2626);color:#fff;box-shadow:0 4px 14px rgba(239,68,68,.3)}
.lq-btn--warning{background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff;box-shadow:0 4px 14px rgba(245,158,11,.3)}

/* ─── INPUTS ────────────────────────────────────────────────────── */
.lq-input{
  width:100%;padding:11px 16px;
  font-family:var(--lq-font);font-size:.9rem;
  background:var(--lq-glass);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border:1px solid var(--lq-glass-border);
  border-radius:var(--lq-radius);
  color:var(--lq-text);
  transition:all var(--lq-dur) var(--lq-spring);
  outline:none;
}
.lq-input:focus{
  border-color:var(--lq-accent);
  box-shadow:0 0 0 3px var(--lq-accent-light), var(--lq-shadow);
}
.lq-input::placeholder{color:var(--lq-text-tertiary)}

/* ─── TAGS / BADGES ─────────────────────────────────────────────── */
.lq-tag{
  display:inline-flex;align-items:center;gap:4px;
  padding:3px 10px;border-radius:var(--lq-radius-pill);
  font-size:.75rem;font-weight:600;
  background:var(--lq-accent-light);color:var(--lq-accent);
}
.lq-tag--success{background:var(--lq-success-light);color:var(--lq-success)}
.lq-tag--warning{background:var(--lq-warning-light);color:var(--lq-warning)}
.lq-tag--danger{background:var(--lq-danger-light);color:var(--lq-danger)}
.lq-tag--info{background:var(--lq-info-light);color:var(--lq-info)}

/* ─── STAT BLOCK ────────────────────────────────────────────────── */
.lq-stat{text-align:center;padding:var(--lq-space-md)}
.lq-stat__value{font-size:2rem;font-weight:800;color:var(--lq-text);line-height:1}
.lq-stat__label{font-size:.8rem;color:var(--lq-text-tertiary);margin-top:4px}

/* ─── GRID ──────────────────────────────────────────────────────── */
.lq-grid{display:grid;gap:var(--lq-space-md)}
.lq-grid--2{grid-template-columns:repeat(2,1fr)}
.lq-grid--3{grid-template-columns:repeat(3,1fr)}
.lq-grid--4{grid-template-columns:repeat(4,1fr)}
.lq-grid--auto{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
.lq-flex{display:flex;gap:var(--lq-space-md);align-items:center}
.lq-flex--col{flex-direction:column;align-items:stretch}
.lq-flex--wrap{flex-wrap:wrap}
.lq-flex--between{justify-content:space-between}

/* ─── QUESTION DISPLAY ──────────────────────────────────────────── */
.lq-question{
  padding: var(--lq-space-lg);
  border-radius: var(--lq-radius-lg);
  background: var(--lq-glass);
  backdrop-filter: blur(var(--lq-glass-blur)) saturate(var(--lq-glass-saturate));
  -webkit-backdrop-filter: blur(var(--lq-glass-blur)) saturate(var(--lq-glass-saturate));
  border: 1px solid var(--lq-glass-border);
  border-left: 4px solid var(--lq-accent);
  box-shadow: var(--lq-shadow);
  transition: all var(--lq-dur) var(--lq-spring);
}
.lq-question:hover{
  transform: translateY(-2px);
  box-shadow: var(--lq-shadow-lg);
}
.lq-question__num{
  font-size:.78rem;font-weight:700;text-transform:uppercase;
  color:var(--lq-accent);margin-bottom:6px;
  display:flex;align-items:center;gap:8px;
}
.lq-question__text{font-size:1rem;line-height:1.6;margin-bottom:var(--lq-space-md);color:var(--lq-text)}
.lq-question__opts{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.lq-question__opt{
  padding:11px 16px;border-radius:var(--lq-radius);
  background:var(--lq-glass-hover);
  border:1px solid var(--lq-glass-border-subtle);
  font-size:.9rem;color:var(--lq-text);
  transition:all var(--lq-dur) var(--lq-spring);
  cursor:pointer;position:relative;
}
.lq-question__opt:hover{
  background:var(--lq-accent-light);
  border-color:var(--lq-accent);
  transform:translateY(-1px);
}
.lq-question__opt--correct{
  background:var(--lq-success-light) !important;
  border-color:var(--lq-success) !important;
  font-weight:600;
}
.lq-question__opt--correct::after{
  content:'✓';position:absolute;right:12px;top:50%;transform:translateY(-50%);
  color:var(--lq-success);font-weight:700;font-size:1.1rem;
}
.lq-question__hint{
  margin-top:var(--lq-space-sm);font-size:.85rem;color:var(--lq-warning);font-style:italic;
  display:flex;align-items:center;gap:6px;
}
.lq-question__points{
  font-size:.78rem;font-weight:600;
  padding:2px 10px;border-radius:var(--lq-radius-pill);
  background:var(--lq-accent);color:#fff;
  margin-left:auto;
}
.lq-question__fill-answer{
  color:var(--lq-accent);font-weight:700;
  border-bottom:2px dashed var(--lq-accent);padding:0 4px;
}

/* ─── SIDEBAR NAV ───────────────────────────────────────────────── */
.lq-nav{display:flex;flex-direction:column;gap:2px}
.lq-nav__item{
  display:flex;align-items:center;gap:12px;
  padding:10px 14px;border-radius:var(--lq-radius);
  font-size:.9rem;font-weight:500;color:var(--lq-text-secondary);
  cursor:pointer;transition:all var(--lq-dur) var(--lq-spring);
  text-decoration:none;position:relative;
}
.lq-nav__item:hover{
  background:var(--lq-glass-hover);
  color:var(--lq-text);
}
.lq-nav__item--active{
  background:var(--lq-accent-light);
  color:var(--lq-accent);
  font-weight:600;
}
.lq-nav__item--active::before{
  content:'';position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:3px;height:20px;border-radius:2px;background:var(--lq-accent);
}
.lq-nav__icon{width:20px;text-align:center;flex-shrink:0;font-size:1rem}
.lq-nav__badge{
  margin-left:auto;font-size:.7rem;font-weight:700;
  min-width:20px;height:20px;display:flex;align-items:center;justify-content:center;
  border-radius:var(--lq-radius-pill);
  background:var(--lq-danger);color:#fff;
}
.lq-nav__group{
  font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;
  color:var(--lq-text-tertiary);padding:16px 14px 6px;
}

/* ─── LOADING SHIMMER ───────────────────────────────────────────── */
.lq-shimmer{
  background: linear-gradient(90deg, var(--lq-glass) 25%, var(--lq-glass-hover) 50%, var(--lq-glass) 75%);
  background-size: 200% 100%;
  animation: lq-shimmer 1.5s infinite;
  border-radius: var(--lq-radius);
}
@keyframes lq-shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* ─── SCROLLBAR ─────────────────────────────────────────────────── */
.lq ::-webkit-scrollbar{width:6px;height:6px}
.lq ::-webkit-scrollbar-track{background:transparent}
.lq ::-webkit-scrollbar-thumb{background:rgba(37,99,235,.15);border-radius:3px}
.lq ::-webkit-scrollbar-thumb:hover{background:rgba(37,99,235,.25)}

/* ─── TOOLTIP ───────────────────────────────────────────────────── */
[data-lq-tooltip]{position:relative}
[data-lq-tooltip]::after{
  content:attr(data-lq-tooltip);
  position:absolute;bottom:calc(100% + 8px);left:50%;transform:translateX(-50%) translateY(4px);
  padding:5px 12px;border-radius:var(--lq-radius-sm);
  font-size:.76rem;font-weight:500;white-space:nowrap;
  background:var(--lq-text);color:var(--lq-text-inverse);
  opacity:0;pointer-events:none;
  transition:all var(--lq-dur) var(--lq-spring);z-index:9999;
}
[data-lq-tooltip]:hover::after{opacity:1;transform:translateX(-50%) translateY(0)}

/* ─── DIVIDER ───────────────────────────────────────────────────── */
.lq-divider{border:none;height:1px;background:var(--lq-glass-border);margin:var(--lq-space-lg) 0}

/* ─── RESPONSIVE ────────────────────────────────────────────────── */
@media(max-width:768px){
  .lq-grid--2,.lq-grid--3,.lq-grid--4{grid-template-columns:1fr}
  .lq-question__opts{grid-template-columns:1fr}
  .lq-container{padding:0 var(--lq-space-md)}
  .lq-layout__sidebar{
    position:fixed;left:0;top:0;
    transform:translateX(-100%);width:280px;
    z-index:1000;
  }
  .lq-layout__sidebar.lq-sidebar--open{transform:translateX(0)}
  .lq-layout__main{padding:var(--lq-space-md)}
  .lq-h1{font-size:1.6rem}
  .lq-h2{font-size:1.3rem}
}
@media(max-width:480px){
  .lq-card{padding:var(--lq-space-md)}
  .lq-question{padding:var(--lq-space-md)}
  .lq-btn--lg{padding:12px 24px;font-size:.9rem}
}