/* ==========================================================================
   Striver-79 — Documentation Explorer
   Design: VS Code explorer chrome + LeetCode problem cards + GitBook reading
   ========================================================================== */

:root{
  /* ---- Dark theme tokens (default) ---- */
  --bg-canvas:#0d1117;
  --bg-surface:#11161d;
  --bg-surface-2:#161b22;
  --bg-elevated:#1c2129;
  --bg-hover:#1f2731;
  --border:#262d38;
  --border-soft:#1c222b;

  --text-primary:#e6edf3;
  --text-secondary:#8b949e;
  --text-tertiary:#5b6472;

  --accent:#4c8dff;
  --accent-strong:#2f6fe0;
  --accent-soft:rgba(76,141,255,0.12);
  --accent-soft-border:rgba(76,141,255,0.35);

  --easy:#3fb950;
  --easy-bg:rgba(63,185,80,0.12);
  --medium:#e3a008;
  --medium-bg:rgba(227,160,8,0.12);
  --hard:#f85149;
  --hard-bg:rgba(248,81,73,0.12);

  --font-ui:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --font-mono:'JetBrains Mono','SFMono-Regular',Consolas,monospace;

  --radius-sm:6px;
  --radius-md:10px;
  --radius-lg:16px;
  --shadow-sm:0 1px 2px rgba(0,0,0,0.3);
  --shadow-md:0 8px 24px rgba(0,0,0,0.35);
  --shadow-lg:0 16px 48px rgba(0,0,0,0.45);

  --header-h:60px;
  --sidebar-w:330px;
  --transition:180ms cubic-bezier(0.4,0,0.2,1);
}

html[data-theme="light"]{
  --bg-canvas:#f6f8fa;
  --bg-surface:#ffffff;
  --bg-surface-2:#ffffff;
  --bg-elevated:#ffffff;
  --bg-hover:#f0f3f7;
  --border:#d8dee6;
  --border-soft:#e8ecf1;

  --text-primary:#1b222c;
  --text-secondary:#57606a;
  --text-tertiary:#8b949e;

  --accent:#2f6fe0;
  --accent-strong:#1f56ba;
  --accent-soft:rgba(47,111,224,0.08);
  --accent-soft-border:rgba(47,111,224,0.3);

  --easy-bg:rgba(31,136,61,0.1);
  --easy:#1f883d;
  --medium-bg:rgba(154,103,0,0.1);
  --medium:#9a6700;
  --hard-bg:rgba(207,34,46,0.1);
  --hard:#cf222e;

  --shadow-sm:0 1px 2px rgba(31,35,40,0.08);
  --shadow-md:0 8px 24px rgba(31,35,40,0.1);
  --shadow-lg:0 16px 48px rgba(31,35,40,0.14);
}

*,*::before,*::after{box-sizing:border-box;}
[hidden]{display:none !important;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg-canvas);
  color:var(--text-primary);
  font-family:var(--font-ui);
  -webkit-font-smoothing:antialiased;
  line-height:1.5;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;cursor:pointer;}
::selection{background:var(--accent-soft);color:var(--accent);}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;}

::-webkit-scrollbar{width:10px;height:10px;}
::-webkit-scrollbar-track{background:transparent;}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:8px;border:2px solid var(--bg-canvas);}
::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary);}

/* ============ GLOBAL LOADER ============ */
.global-loader{
  position:fixed;inset:0;z-index:9999;
  display:flex;align-items:center;justify-content:center;
  background:var(--bg-canvas);
  transition:opacity 400ms ease, visibility 400ms ease;
}
.global-loader.hidden{opacity:0;visibility:hidden;pointer-events:none;}
.loader-ring{
  width:44px;height:44px;border-radius:50%;
  border:3px solid var(--border);
  border-top-color:var(--accent);
  animation:spin 0.8s linear infinite;
}
.loader-ring-sm{width:18px;height:18px;border-width:2px;}
@keyframes spin{to{transform:rotate(360deg);}}

/* ============ HEADER ============ */
.app-header{
  position:sticky;top:0;z-index:500;
  height:var(--header-h);
  display:flex;align-items:center;gap:16px;
  padding:0 20px;
  background:color-mix(in srgb, var(--bg-surface) 88%, transparent);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
}
.header-left{display:flex;align-items:center;gap:8px;}
.hamburger-btn{display:flex;}
.brand{display:flex;align-items:center;gap:9px;font-family:var(--font-mono);font-weight:700;font-size:17px;letter-spacing:-0.02em;}
.brand-mark{
  width:30px;height:30px;border-radius:8px;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(145deg,var(--accent),var(--accent-strong));
  color:#fff;font-size:14px;
  box-shadow:var(--shadow-sm);
}
.brand-accent{color:var(--accent);}

.header-nav{display:flex;align-items:center;gap:4px;margin-left:8px;}
.nav-link{
  background:none;border:none;color:var(--text-secondary);
  font-size:14px;font-weight:500;padding:8px 12px;border-radius:var(--radius-sm);
  transition:all var(--transition);
}
.nav-link:hover{color:var(--text-primary);background:var(--bg-hover);}
.nav-link.active{color:var(--accent);background:var(--accent-soft);}

.header-right{display:flex;align-items:center;gap:10px;margin-left:auto;}
.global-search{
  display:flex;align-items:center;gap:8px;
  width:280px;padding:8px 12px;
  background:var(--bg-surface-2);border:1px solid var(--border);border-radius:var(--radius-md);
  color:var(--text-tertiary);
  transition:border-color var(--transition);
}
.global-search:focus-within{border-color:var(--accent-soft-border);}
.global-search input{
  flex:1;border:none;background:none;outline:none;color:var(--text-primary);font-size:13.5px;
}
.global-search input::placeholder{color:var(--text-tertiary);}
.global-search kbd{
  font-family:var(--font-mono);font-size:11px;color:var(--text-tertiary);
  background:var(--bg-elevated);border:1px solid var(--border);border-radius:4px;padding:1px 6px;
}

.header-select {
  background: var(--bg-surface-2);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: var(--radius-md);
  font-size: 13.5px;
  outline: none;
  cursor: pointer;
  transition: all var(--transition);
}
.header-select:hover {
  border-color: var(--accent-soft-border);
}

.icon-btn{
  width:36px;height:36px;display:flex;align-items:center;justify-content:center;
  background:var(--bg-surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);
  color:var(--text-secondary);font-size:14px;transition:all var(--transition);
}
.icon-btn:hover{color:var(--text-primary);background:var(--bg-hover);border-color:var(--text-tertiary);}
.icon-btn-sm{width:30px;height:30px;font-size:12.5px;}

/* ============ BUTTONS ============ */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 20px;border-radius:var(--radius-md);
  font-size:14.5px;font-weight:600;border:1px solid transparent;
  transition:all var(--transition);
}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 4px 14px rgba(76,141,255,0.35);}
.btn-primary:hover{background:var(--accent-strong);transform:translateY(-1px);}
.btn-secondary{background:var(--bg-surface-2);color:var(--text-primary);border-color:var(--border);}
.btn-secondary:hover{border-color:var(--text-tertiary);background:var(--bg-hover);}
.btn-ghost{background:transparent;color:var(--text-secondary);border-color:var(--border);padding:8px 14px;font-size:13.5px;}
.btn-ghost:hover{color:var(--text-primary);background:var(--bg-hover);}

/* ============ PAGES ============ */
.page{min-height:calc(100vh - var(--header-h));}

/* ---- HERO ---- */
.hero{
  position:relative;
  padding:96px 24px 72px;
  text-align:center;
  overflow:hidden;
  border-bottom:1px solid var(--border-soft);
}
.hero-grid{
  position:absolute;inset:0;
  background-image:
    linear-gradient(var(--border-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-soft) 1px, transparent 1px);
  background-size:44px 44px;
  mask-image:radial-gradient(ellipse 70% 60% at 50% 20%, black 0%, transparent 75%);
  opacity:0.7;
}
.hero-inner{position:relative;max-width:760px;margin:0 auto;}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:7px;
  font-family:var(--font-mono);font-size:12.5px;font-weight:600;color:var(--accent);
  background:var(--accent-soft);border:1px solid var(--accent-soft-border);
  padding:6px 14px;border-radius:100px;margin-bottom:28px;
}
.hero-title{
  font-size:clamp(38px,6vw,64px);font-weight:800;letter-spacing:-0.03em;
  line-height:1.06;margin:0 0 20px;
}
.hero-title-accent{
  background:linear-gradient(120deg,var(--accent),#7db1ff 60%,var(--accent));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-subtitle{
  font-size:17px;color:var(--text-secondary);max-width:560px;margin:0 auto 36px;
}
.hero-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;}

/* ---- STATS ---- */
.stats-section{padding:56px 24px;max-width:1080px;margin:0 auto;}
.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:900px;margin:0 auto;}
.stat-card{
  background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:26px 20px;text-align:center;transition:transform var(--transition),border-color var(--transition);
}
.stat-card:hover{transform:translateY(-3px);border-color:var(--accent-soft-border);}
.stat-icon{
  width:42px;height:42px;margin:0 auto 14px;border-radius:11px;
  background:var(--accent-soft);color:var(--accent);
  display:flex;align-items:center;justify-content:center;font-size:17px;
}
.stat-value,.stat-value-static{font-family:var(--font-mono);font-size:32px;font-weight:700;letter-spacing:-0.02em;}
.stat-label{font-size:13px;color:var(--text-secondary);margin-top:4px;font-weight:500;}

/* ---- TOPICS PREVIEW ---- */
.topics-preview{max-width:1080px;margin:0 auto;padding:24px 24px 96px;}
.section-heading{font-size:22px;font-weight:700;letter-spacing:-0.01em;margin:0 0 20px;}
.topic-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px;}
.topic-card{
  display:flex;align-items:center;gap:14px;
  background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-md);
  padding:16px;text-align:left;transition:all var(--transition);
}
.topic-card:hover{border-color:var(--accent-soft-border);background:var(--bg-hover);transform:translateY(-2px);}
.topic-card-icon{
  width:38px;height:38px;flex-shrink:0;border-radius:9px;
  display:flex;align-items:center;justify-content:center;font-size:15px;
  background:var(--accent-soft);color:var(--accent);
}
.topic-card-name{font-weight:600;font-size:14.5px;}
.topic-card-count{font-size:12.5px;color:var(--text-secondary);margin-top:2px;}

/* ============ EXPLORER LAYOUT ============ */
.page-explorer{
  display:grid;
  grid-template-columns:var(--sidebar-w) minmax(0,1fr);
  height:calc(100vh - var(--header-h));
  overflow:hidden;
}
.page-explorer.sidebar-collapsed{grid-template-columns:0 minmax(0,1fr);}

/* ---- SIDEBAR (VS Code explorer) ---- */
.sidebar{
  background:var(--bg-surface);border-right:1px solid var(--border);
  overflow:hidden;display:flex;flex-direction:column;
  transition:width var(--transition);
}
.sidebar-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 16px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:0.08em;
  color:var(--text-secondary);border-bottom:1px solid var(--border-soft);flex-shrink:0;
}
.sidebar-header span{display:flex;align-items:center;gap:8px;}
.sidebar-tree{flex:1;overflow-y:auto;padding:8px;}

.tree-topic{margin-bottom:2px;}
.tree-topic-btn{
  width:100%;display:flex;align-items:center;gap:8px;
  background:none;border:none;color:var(--text-primary);
  padding:8px 8px;border-radius:var(--radius-sm);font-size:13.5px;font-weight:500;
  transition:background var(--transition);
}
.tree-topic-btn:hover{background:var(--bg-hover);}
.tree-topic-btn i.fa-chevron-right{
  font-size:10px;color:var(--text-tertiary);transition:transform var(--transition);width:10px;
}
.tree-topic.expanded .tree-topic-btn i.fa-chevron-right{transform:rotate(90deg);}
.tree-topic-btn i.fa-folder,.tree-topic-btn i.fa-folder-open{color:var(--accent);width:14px;}
.tree-topic-count{
  margin-left:auto;font-family:var(--font-mono);font-size:10.5px;color:var(--text-tertiary);
  background:var(--bg-elevated);padding:1px 6px;border-radius:8px;
}
.tree-items{max-height:0;overflow:hidden;transition:max-height 260ms ease;}
.tree-topic.expanded .tree-items{max-height:1200px;}
.tree-item{
  display:flex;align-items:center;gap:10px;
  background:none;border:none;outline:none;
  width:100%;text-align:left;
  padding:7px 8px 7px 24px;border-radius:var(--radius-sm);
  font-size:13px;color:var(--text-secondary);
  position:relative;
  transition:all var(--transition);
  cursor:pointer;
}
.tree-item::before {
  content: ''; position: absolute;
  left: 9px; top: 0; bottom: 0;
  width: 1px; background: var(--border-soft);
}
.tree-item:hover{color:var(--text-primary);background:var(--bg-hover);}
.tree-item.active{color:var(--accent);background:var(--accent-soft);}
.tree-item.active::before { background: var(--accent); width: 2px; }

/* Custom Checkbox */
.custom-checkbox {
  position: relative; display: inline-flex; align-items: center; justify-content: center;
  width: 16px; height: 16px; cursor: pointer; flex-shrink: 0;
}
.custom-checkbox input { opacity: 0; width: 0; height: 0; position: absolute; }
.custom-checkbox .checkmark {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  border: 1px solid var(--text-tertiary); border-radius: 4px;
  transition: all 0.2s ease;
  display: flex; align-items: center; justify-content: center;
}
/* ============ HOMEPAGE DASHBOARD VISUALS ============ */
.dashboard-visuals {
  padding: 0 24px 56px; max-width: 1080px; margin: 0 auto;
}
.dash-grid {
  display: grid; grid-template-columns: 1fr; gap: 24px; margin-top: 24px;
}
@media (min-width: 768px) {
  .dash-grid { grid-template-columns: 1fr 1fr; }
}
.dash-card {
  background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 24px; text-align: center;
}
.dash-card h3 {
  margin-top: 0; font-size: 16px; color: var(--text-secondary); margin-bottom: 24px; font-weight: 600;
}
.dash-stats {
  margin-top: 16px; font-size: 15px; font-weight: 600; color: var(--text-primary);
}
.dash-stats span { color: var(--accent); font-size: 20px; }

/* Circular Progress */
.progress-circle-wrap { width: 140px; margin: 0 auto; position: relative; }
.circular-chart { display: block; margin: 0 auto; max-width: 100%; max-height: 250px; }
.circle-bg { fill: none; stroke: var(--bg-surface-2); stroke-width: 2.8; }
.circle {
  fill: none; stroke-width: 2.8; stroke-linecap: round;
  stroke: var(--accent); transition: stroke-dasharray 1s ease-out;
}
.percentage {
  fill: var(--text-primary); font-family: var(--font-mono); font-size: 8px;
  text-anchor: middle; font-weight: 700;
}

/* Difficulty Breakdown Bars */
.difficulty-card { text-align: left; }
.diff-stats { display: flex; flex-direction: column; gap: 16px; }
.diff-item { display: flex; align-items: center; gap: 12px; }
.diff-label {
  font-size: 12px; font-weight: 600; width: 50px; text-transform: uppercase;
}
.diff-label.easy { color: var(--easy); }
.diff-label.medium { color: var(--medium); }
.diff-label.hard { color: var(--hard); }

.diff-bar-wrap {
  flex: 1; background: var(--bg-surface-2); height: 8px; border-radius: 4px; overflow: hidden;
}
.diff-bar {
  height: 100%; border-radius: 4px; transition: width 1s ease-out;
}
.diff-bar.easy-bar { background: var(--easy); }
.diff-bar.medium-bar { background: var(--medium); }
.diff-bar.hard-bar { background: var(--hard); }

.diff-count {
  font-family: var(--font-mono); font-size: 13px; color: var(--text-secondary); width: 40px; text-align: right;
}

/* Auth Pages Styling */
.auth-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: var(--bg-canvas); }
.auth-container { width: 100%; max-width: 400px; padding: 20px; }
.auth-brand { justify-content: center; margin-bottom: 32px; font-size: 24px; text-decoration: none; display: flex; align-items: center; }
.auth-card {
  background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px 24px;
  box-shadow: var(--shadow-lg); text-align: left;
}
.auth-card h2 { margin: 0 0 8px 0; font-size: 22px; text-align: center; }
.auth-subtitle { text-align: center; color: var(--text-tertiary); font-size: 14px; margin-bottom: 24px; }
.auth-form { display: flex; flex-direction: column; gap: 16px; }
.auth-form .form-group { display: flex; flex-direction: column; gap: 6px; text-align: left; }
.auth-form label { font-size: 13px; font-weight: 600; color: var(--text-secondary); text-align: left; }
.auth-form input {
  width: 100%; padding: 10px 14px; background: var(--bg-surface-2);
  border: 1px solid var(--border); border-radius: var(--radius-md);
  color: var(--text-primary); outline: none; transition: border-color var(--transition);
}
.auth-form input:focus { border-color: var(--accent); }
.btn-block { width: 100%; justify-content: center; margin-top: 8px; padding: 12px; }
.auth-error { color: var(--hard); font-size: 13px; font-weight: 600; text-align: center; background: var(--hard-bg); padding: 8px; border-radius: var(--radius-sm); }
.auth-footer { text-align: center; margin-top: 24px; font-size: 14px; color: var(--text-secondary); }
.auth-footer a { color: var(--accent); text-decoration: none; font-weight: 600; }
.auth-footer a:hover { text-decoration: underline; }
.custom-checkbox:hover .checkmark { border-color: var(--text-secondary); }
.custom-checkbox input:checked ~ .checkmark {
  background-color: var(--accent); border-color: var(--accent);
}
.custom-checkbox .checkmark::after {
  content: ""; display: none;
  width: 4px; height: 8px; border: solid white; border-width: 0 2px 2px 0;
  transform: rotate(45deg); margin-bottom: 2px;
}
.custom-checkbox input:checked ~ .checkmark::after {
  display: block; animation: checkmark-pop 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}
@keyframes checkmark-pop {
  0% { transform: rotate(45deg) scale(0); }
  100% { transform: rotate(45deg) scale(1); }
}
.tree-item-title { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; transition: color 0.2s ease; }
.tree-item.solved .tree-item-title { color: var(--text-tertiary); }
.tree-item i{font-size:11px;color:var(--text-tertiary);width:12px;}
.tree-item.active i{color:var(--accent);}

/* ---- SIDEBAR FILTERS ---- */
.sidebar-filters{
  padding:12px 14px;
  border-bottom:1px solid var(--border-soft);
  display:flex;flex-direction:column;gap:12px;
}
.search-bar{
  display:flex;align-items:center;gap:9px;
  background:var(--bg-surface-2);border:1px solid var(--border);border-radius:var(--radius-md);
  padding:9px 12px;color:var(--text-tertiary);
}
.search-bar:focus-within{border-color:var(--accent-soft-border);}
.search-bar input{flex:1;border:none;background:none;outline:none;color:var(--text-primary);font-size:13.5px;}

.filter-row{
  display:flex;flex-wrap:wrap;gap:10px;align-items:center;
}
.filter-group{display:flex;align-items:center;gap:6px;flex-wrap:wrap;}
.filter-label{font-size:11px;text-transform:uppercase;letter-spacing:0.06em;color:var(--text-tertiary);font-weight:700;margin-right:2px;}
.chip{
  font-size:12.5px;font-weight:600;padding:6px 12px;border-radius:100px;
  background:var(--bg-surface);border:1px solid var(--border);color:var(--text-secondary);
  transition:all var(--transition);
}
.chip:hover{border-color:var(--text-tertiary);color:var(--text-primary);}
.chip.active{color:#fff;border-color:transparent;}
.chip-easy.active{background:var(--easy);}
.chip-medium.active{background:var(--medium);}
.chip-hard.active{background:var(--hard);}
.chip:not(.chip-easy):not(.chip-medium):not(.chip-hard).active{background:var(--accent);}
.chip-clear{color:var(--hard);border-color:var(--hard-bg);}

.badge-lang{
  font-family:var(--font-mono);color:var(--text-tertiary);background:var(--bg-elevated);
  text-transform:none;font-weight:600;
}

.empty-state{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:10px;padding:60px 20px;color:var(--text-tertiary);text-align:center;
}
.empty-state i{font-size:28px;opacity:0.5;}

/* ---- RIGHT VIEWER ---- */
.viewer-panel{overflow-y:auto;background:var(--bg-canvas);position:relative;}
.viewer-empty{
  height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:14px;color:var(--text-tertiary);
}
.viewer-empty i{font-size:40px;opacity:0.35;}
.viewer-empty p{font-size:14px;max-width:220px;text-align:center;}

.viewer-content{padding:20px 22px 40px;}
.viewer-header{
  padding-bottom:16px;margin-bottom:14px;border-bottom:1px solid var(--border-soft);
}
.viewer-title-row{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;}
.viewer-title{font-size:21px;font-weight:700;letter-spacing:-0.01em;margin:0 0 10px;}
.viewer-badges{display:flex;gap:8px;margin-bottom:14px;}
.viewer-links{display:flex;gap:8px;flex-wrap:wrap;}
.link-btn{
  display:inline-flex;align-items:center;gap:7px;
  font-size:12.5px;font-weight:600;padding:7px 12px;border-radius:var(--radius-sm);
  background:var(--bg-surface);border:1px solid var(--border);color:var(--text-secondary);
  transition:all var(--transition);
}
.link-btn:hover{color:var(--accent);border-color:var(--accent-soft-border);background:var(--accent-soft);}

.lang-selector{display:flex;gap:6px;margin-bottom:12px;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:4px;width:fit-content;}
.lang-btn{
  background:none;border:none;color:var(--text-secondary);font-weight:600;font-size:13px;
  padding:7px 16px;border-radius:7px;transition:all var(--transition);font-family:var(--font-mono);
}
.lang-btn:hover{color:var(--text-primary);}
.lang-btn.active{background:var(--accent);color:#fff;}

.code-toolbar{
  display:flex;align-items:center;justify-content:space-between;
  background:var(--bg-surface-2);border:1px solid var(--border);border-bottom:none;
  border-radius:var(--radius-md) var(--radius-md) 0 0;
  padding:9px 12px;
}
.code-filename{font-family:var(--font-mono);font-size:12.5px;color:var(--text-secondary);}
.code-actions{display:flex;gap:6px;}

.code-container{
  position:relative;border:1px solid var(--border);border-radius:0 0 var(--radius-md) var(--radius-md);
  overflow:hidden;background:#1e1e1e;
}
.code-container pre{margin:0!important;border-radius:0!important;font-size:13px!important; color: #e6edf3 !important; overflow: auto !important;}
.code-container pre[class*="language-"]{background:#1e1e1e!important;}
.code-container.wrapped pre code{white-space:pre-wrap!important;word-break:break-word;}
.code-container.wrapped pre{white-space:pre-wrap!important;}

.code-loading,.code-error{
  display:flex;align-items:center;justify-content:center;gap:10px;
  padding:60px 20px;color:var(--text-tertiary);font-size:13.5px;
}
.code-error{color:var(--hard);flex-direction:column;text-align:center;}

.code-container.fullscreen{
  position:fixed;inset:20px;z-index:2000;border-radius:var(--radius-md);
  box-shadow:var(--shadow-lg);
}
.code-container.fullscreen pre{max-height:calc(100vh - 40px);}

/* ============ FOOTER ============ */
.app-footer{border-top:1px solid var(--border);background:var(--bg-surface);}
.footer-inner{max-width:640px;margin:0 auto;padding:48px 24px;text-align:center;}
.footer-brand{font-family:var(--font-mono);font-weight:700;font-size:16px;display:inline-flex;align-items:center;gap:8px;color:var(--accent);}
.footer-tagline{color:var(--text-secondary);font-size:13.5px;margin:10px 0 20px;}
.footer-links{display:flex;gap:20px;justify-content:center;margin-bottom:20px;}
.footer-links a{font-size:13.5px;font-weight:600;color:var(--text-secondary);display:flex;align-items:center;gap:7px;transition:color var(--transition);}
.footer-links a:hover{color:var(--accent);}
.footer-copy{font-size:12px;color:var(--text-tertiary);}

/* ============ TOAST ============ */
.toast{
  position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(20px);
  background:var(--bg-elevated);border:1px solid var(--border);color:var(--text-primary);
  padding:11px 20px;border-radius:var(--radius-md);font-size:13.5px;font-weight:600;
  box-shadow:var(--shadow-lg);display:flex;align-items:center;gap:9px;
  opacity:0;pointer-events:none;transition:all 260ms cubic-bezier(0.4,0,0.2,1);z-index:3000;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}
.toast i{color:var(--easy);}

/* ============ DRAWER OVERLAY (mobile) ============ */
.drawer-overlay{
  position:fixed;inset:0;background:rgba(0,0,0,0.5);z-index:400;
  opacity:0;visibility:hidden;transition:all var(--transition);
}
.drawer-overlay.show{opacity:1;visibility:visible;}

/* ============ RESPONSIVE ============ */
@media (max-width:1180px){
  .page-explorer{grid-template-columns:280px minmax(0,1fr);}
}

@media (max-width:1024px){
  .global-search{width:200px;}
  .page-explorer{
    grid-template-columns:1fr;
    height:auto;
  }
  .sidebar{
    position:fixed;top:var(--header-h);left:0;bottom:0;width:300px;z-index:450;
    transform:translateX(-100%);transition:transform var(--transition);
  }
  .sidebar.drawer-open{transform:translateX(0);box-shadow:var(--shadow-lg);}
  .sidebar-collapse-btn,#sidebar-collapse-btn{display:none;}
  .viewer-panel{height:auto;min-height:60vh;}
  .mobile-only{display:inline-flex;}
  .page-explorer:not(.viewer-active) .viewer-panel{display:none;}
}

@media (max-width:720px){
  .header-nav{display:none;}
  .global-search{width:130px;}
  .stats-grid{grid-template-columns:repeat(2,1fr);}
  .hero{padding:64px 20px 48px;}
  .hero-actions{flex-direction:column;align-items:stretch;}
  .filter-row{gap:10px;}
}

@media (max-width:480px){
  .global-search{display:none;}
  .viewer-content{padding:16px 14px 32px;}
  .code-container.fullscreen{inset:10px;}
}

/* ============ REDUCED MOTION ============ */
@media (prefers-reduced-motion:reduce){
  *{animation-duration:0.001ms!important;transition-duration:0.001ms!important;}
  html{scroll-behavior:auto;}
}