/* ═══════════════════════════════════════════════════════════════
   DIJKSTRA.CSS — Page-specific styles
   Requires: global.css (variables, reset, body, scanline, grid-bg,
             theme-toggle, keyframes)
═══════════════════════════════════════════════════════════════ */

/* ── LIGHT MODE OVERRIDES ─────────────────────────────────────── */
[data-theme="light"] .code-outer      { background: #f8f7f4; }
[data-theme="light"] .code-tabs       { background: #edeae4; }
[data-theme="light"] .code-content    { color: #1a1a18; }
[data-theme="light"] .full-code-block { background: #f8f7f4; color: #1a1a18; }
[data-theme="light"] .uc-example      { background: #f0ede8; }
[data-theme="light"] .edge-weight     { fill: #78716c; }
[data-theme="light"] .kw  { color: #6d28d9; }
[data-theme="light"] .fn  { color: #0369a1; }
[data-theme="light"] .at  { color: #c2410c; }
[data-theme="light"] .str { color: #92400e; }
[data-theme="light"] .cm  { color: #9ca3af; }
[data-theme="light"] .hl  { color: #15803d; }
[data-theme="light"] .nm  { color: #be185d; }
[data-theme="light"] .op  { color: #4b5563; }
[data-theme="light"] .dist-table td { border-bottom-color: rgba(0,0,0,0.05); }
[data-theme="light"] .path-row      { border-bottom-color: rgba(0,0,0,0.05); }
[data-theme="light"] .path-display  { background: rgba(21,128,61,0.05); }

/* ── CONTAINER ────────────────────────────────────────────────── */
.container {
  position: relative; z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px 12px 80px;
}
@media (min-width: 600px)  { .container { padding: 24px 20px 60px; } }
@media (min-width: 1024px) { .container { padding: 28px 24px 60px; } }

/* ── HEADER ───────────────────────────────────────────────────── */
.header {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
  padding: 16px;
  border: 1px solid var(--border);
  border-left: 4px solid var(--cyan);
  background: linear-gradient(90deg, rgba(6,182,212,0.06) 0%, transparent 60%);
}
@media (min-width: 640px) {
  .header {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    margin-bottom: 24px;
  }
}
.header-badge {
  font-size: 9px;
  letter-spacing: 3px;
  color: var(--cyan);
  margin-bottom: 3px;
  opacity: 0.7;
}
.header-title {
  font-family: 'Rajdhani', sans-serif;
  font-size: clamp(28px, 8vw, 58px);
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--text);
  line-height: 1;
  margin-bottom: 3px;
}
.header-title span { color: var(--cyan); }
.header-sub {
  font-family: 'VT323', monospace;
  font-size: clamp(14px, 4vw, 20px);
  color: var(--muted);
  letter-spacing: 2px;
}
.header-right {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px 16px;
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 1px;
}
@media (min-width: 640px) {
  .header-right { text-align: right; display: block; line-height: 1.9; }
}
.header-right strong { color: var(--gold); }

/* ── MAIN TABS ────────────────────────────────────────────────── */
.tabs {
  display: flex;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tab {
  font-family: 'Share Tech Mono', monospace;
  font-size: 11px;
  letter-spacing: 1px;
  padding: 10px 14px;
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  position: relative;
  transition: all 0.3s;
  text-transform: uppercase;
  white-space: nowrap;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
}
@media (min-width: 480px) { .tab { font-size: 12px; letter-spacing: 2px; padding: 10px 18px; } }
.tab:hover { color: var(--text); }
.tab.active { color: var(--cyan); background: rgba(6,182,212,0.06); }
.tab.active::after {
  content: '';
  position: absolute;
  bottom: -1px; left: 0; right: 0;
  height: 2px;
  background: var(--cyan);
}
.tab-pane { display: none; }
.tab-pane.active { display: block; }

/* ── PANEL ────────────────────────────────────────────────────── */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 14px;
}
@media (min-width: 480px) { .panel { padding: 18px; } }
.panel-title {
  font-family: 'Rajdhani', sans-serif;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--cyan);
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 7px;
  text-transform: uppercase;
}

/* ── STEP INDICATOR ───────────────────────────────────────────── */
.step-indicator {
  display: flex; gap: 6px; margin-bottom: 12px; flex-wrap: wrap;
  align-items: center;
}
.step-indicator-label { font-size: 10px; color: var(--muted); letter-spacing: 2px; margin-right: 4px; }
.step-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--border); border: 1px solid #334155;
  transition: all 0.4s;
}
.step-dot.active { background: var(--pink); box-shadow: 0 0 10px var(--pink); border-color: var(--pink); }
.step-dot.done   { background: var(--green); box-shadow: 0 0 6px var(--green); border-color: var(--green); }

/* ── STEP DESCRIPTION ─────────────────────────────────────────── */
.step-desc {
  border: 1px solid var(--border);
  border-left: 3px solid var(--cyan);
  padding: 10px 14px;
  margin-bottom: 12px;
  background: rgba(6,182,212,0.03);
  font-size: 12px;
  line-height: 1.7;
  min-height: 50px;
}
@media (min-width: 480px) { .step-desc { font-size: 13px; padding: 12px 16px; } }
.step-num { color: var(--cyan); font-family: 'VT323', monospace; font-size: 17px; margin-right: 6px; }

/* ── VISUALIZER LAYOUT ────────────────────────────────────────── */
.viz-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 14px;
}
@media (min-width: 960px) {
  .viz-grid { display: grid; grid-template-columns: 1fr 380px; gap: 16px; }
}

/* ── GRAPH CANVAS ─────────────────────────────────────────────── */
#graph-canvas {
  width: 100%;
  aspect-ratio: 3 / 2;
  max-height: 360px;
}
svg#graph-svg { width: 100%; height: 100%; overflow: visible; display: block; }
.node-label {
  font-family: 'Rajdhani', sans-serif;
  font-weight: 700; font-size: 16px;
  dominant-baseline: middle; text-anchor: middle; pointer-events: none;
}
.node-dist {
  font-family: 'Share Tech Mono', monospace; font-size: 11px;
  dominant-baseline: middle; text-anchor: middle; pointer-events: none;
}
.edge-weight {
  font-family: 'VT323', monospace; font-size: 16px;
  dominant-baseline: middle; text-anchor: middle; fill: #475569; pointer-events: none;
}

/* ── CONTROLS ─────────────────────────────────────────────────── */
.controls {
  display: flex; gap: 8px; align-items: center; flex-wrap: wrap;
  margin-top: 12px;
}
.btn {
  font-family: 'Share Tech Mono', monospace;
  font-size: 11px; letter-spacing: 1px;
  padding: 10px 16px;
  border: 1px solid var(--cyan);
  background: transparent;
  color: var(--cyan-glow);
  cursor: pointer;
  transition: all 0.25s;
  clip-path: polygon(0 0, calc(100% - 5px) 0, 100% 5px, 100% 100%, 0 100%);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  min-height: 44px;
}
@media (min-width: 480px) { .btn { font-size: 12px; letter-spacing: 2px; padding: 9px 20px; } }
.btn:active   { transform: scale(0.97); }
.btn:hover    { background: rgba(6,182,212,0.12); box-shadow: 0 0 16px rgba(6,182,212,0.25); }
.btn:disabled { opacity: 0.3; cursor: not-allowed; }
.btn.ghost    { border-color: var(--border); color: var(--muted); }
.btn.ghost:hover  { border-color: var(--purple); color: var(--purple-glow); background: rgba(124,58,237,0.08); box-shadow: none; }
.btn.danger   { border-color: var(--gold); color: var(--gold); }
.btn.danger:hover { background: rgba(245,158,11,0.1); }
.speed-sel {
  font-family: 'Share Tech Mono', monospace; font-size: 11px;
  background: var(--panel); border: 1px solid var(--border);
  color: var(--cyan); padding: 10px 8px; cursor: pointer;
  min-height: 44px;
  -webkit-appearance: none;
}

/* ── RIGHT COLUMN ─────────────────────────────────────────────── */
.right-col { display: flex; flex-direction: column; gap: 14px; }

/* ── CODE PANEL ───────────────────────────────────────────────── */
.code-outer {
  background: #060610;
  border: 1px solid var(--border);
  border-left: 3px solid var(--purple);
  overflow: hidden;
}
.code-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  background: #08080f;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.code-tabs::-webkit-scrollbar { display: none; }
.code-tab {
  font-family: 'Share Tech Mono', monospace;
  font-size: 10px; letter-spacing: 1px;
  padding: 8px 11px;
  background: transparent; border: none;
  border-right: 1px solid var(--border);
  color: var(--muted); cursor: pointer;
  transition: all 0.2s; white-space: nowrap; flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
  min-height: 40px;
}
@media (min-width: 480px) { .code-tab { font-size: 11px; padding: 7px 13px; } }
.code-tab:hover  { color: var(--text); }
.code-tab.active { color: var(--purple-glow); background: rgba(124,58,237,0.08); }
.code-content {
  padding: 14px;
  font-size: 11.5px;
  line-height: 1.8;
  min-height: 220px;
  max-height: 360px;
  overflow-y: auto;
  overflow-x: auto;
  white-space: pre;
  -webkit-overflow-scrolling: touch;
}
@media (min-width: 480px) { .code-content { font-size: 12.5px; padding: 16px; min-height: 260px; } }
.code-content::-webkit-scrollbar { width: 3px; height: 3px; }
.code-content::-webkit-scrollbar-thumb { background: var(--border); }

/* ── SYNTAX COLORS (dark mode defaults) ──────────────────────── */
.kw  { color: #a855f7; }
.fn  { color: #67e8f9; }
.at  { color: #fb923c; }
.str { color: #fcd34d; }
.cm  { color: #475569; font-style: italic; }
.hl  { color: #6ee7b7; }
.nm  { color: #f9a8d4; }
.op  { color: #94a3b8; }

/* ── DISTANCE TABLE ───────────────────────────────────────────── */
.dist-table {
  width: 100%; border-collapse: collapse;
  font-size: 12px; margin-bottom: 12px;
}
.dist-table th {
  font-family: 'Rajdhani', sans-serif;
  font-size: 9px; letter-spacing: 2px;
  color: var(--purple); padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  text-align: center; font-weight: 600;
}
.dist-table td {
  padding: 7px 8px; text-align: center;
  border-bottom: 1px solid rgba(255,255,255,0.03);
  font-family: 'Share Tech Mono', monospace;
  transition: all 0.3s; font-size: 12px;
}
.dist-table tr.row-visited td { color: var(--green); }
.dist-table tr.row-active  td { color: var(--pink); background: rgba(236,72,153,0.06); }
.dist-table tr.row-updated td { color: var(--gold); }

/* ── PATH DISPLAY ─────────────────────────────────────────────── */
.path-display {
  margin-top: 12px; padding: 12px;
  border: 1px solid var(--green);
  background: rgba(16,185,129,0.04);
  display: none; animation: fadeUp 0.4s ease;
}
.path-display.visible { display: block; }
.path-title {
  font-family: 'Rajdhani', sans-serif;
  font-size: 10px; letter-spacing: 3px;
  color: var(--green); margin-bottom: 8px; font-weight: 600;
}
.path-row {
  font-size: 11px; padding: 5px 0;
  display: grid; grid-template-columns: 48px 10px 1fr 54px;
  gap: 6px; align-items: center;
  border-bottom: 1px solid rgba(255,255,255,0.03);
}
@media (min-width: 480px) { .path-row { font-size: 12px; } }
.path-row:last-child { border-bottom: none; }
.path-from  { color: var(--muted); }
.path-sep   { color: var(--border); }
.path-nodes { color: var(--green-glow); word-break: break-all; }
.path-cost  { color: var(--gold); text-align: right; }

/* ── ANIMATIONS ───────────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: none; }
}
@keyframes pulseGlow {
  0%,100% { filter: drop-shadow(0 0 5px var(--pink)); }
  50%      { filter: drop-shadow(0 0 18px var(--pink)) drop-shadow(0 0 34px rgba(236,72,153,0.4)); }
}
.node-active { animation: pulseGlow 1.1s ease-in-out infinite; }

/* ── USE CASES ────────────────────────────────────────────────── */
.usecases-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
@media (min-width: 560px) { .usecases-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 960px) { .usecases-grid { grid-template-columns: repeat(3, 1fr); } }
.usecase-card {
  border: 1px solid var(--border);
  border-top: 3px solid var(--cyan);
  background: var(--panel);
  padding: 16px;
  transition: box-shadow 0.3s;
}
.usecase-card:hover { box-shadow: 0 0 24px rgba(124,58,237,0.1); }
.usecase-card:nth-child(2) { border-top-color: var(--gold); }
.usecase-card:nth-child(3) { border-top-color: var(--green); }
.usecase-card:nth-child(4) { border-top-color: var(--pink); }
.usecase-card:nth-child(5) { border-top-color: var(--purple); }
.usecase-card:nth-child(6) { border-top-color: var(--cyan-glow); }
.uc-icon  { font-size: 26px; margin-bottom: 8px; }
.uc-title {
  font-family: 'Rajdhani', sans-serif;
  font-size: 16px; font-weight: 700; letter-spacing: 2px;
  color: var(--text); margin-bottom: 4px;
}
.uc-industry { font-size: 9px; letter-spacing: 3px; color: var(--cyan); margin-bottom: 8px; text-transform: uppercase; }
.uc-desc  { font-size: 12px; color: var(--text2); line-height: 1.7; margin-bottom: 10px; }
.uc-example {
  background: #070710; border-left: 2px solid var(--border);
  padding: 9px 11px; font-size: 11px; color: var(--muted); line-height: 1.6;
}
.uc-example strong { color: var(--gold); }

/* ── FULL SOURCE CODE ─────────────────────────────────────────── */
.full-code-block {
  background: #060610;
  border: 1px solid var(--border);
  border-left: 3px solid var(--purple);
  padding: 14px 16px;
  font-size: 11.5px;
  line-height: 1.85;
  overflow-x: auto;
  white-space: pre;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 4px;
}
@media (min-width: 480px) { .full-code-block { font-size: 12.5px; padding: 18px 20px; } }
.full-code-block::-webkit-scrollbar { height: 3px; }
.full-code-block::-webkit-scrollbar-thumb { background: var(--border); }
.full-code-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 12px; padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  gap: 10px; flex-wrap: wrap;
}
.full-code-title {
  font-family: 'Rajdhani', sans-serif;
  font-size: 12px; letter-spacing: 2px;
  color: var(--purple-glow); font-weight: 600;
}
@media (min-width: 480px) { .full-code-title { font-size: 13px; letter-spacing: 3px; } }
.copy-btn {
  font-family: 'Share Tech Mono', monospace;
  font-size: 11px; letter-spacing: 1px;
  padding: 7px 14px;
  border: 1px solid var(--border);
  background: transparent; color: var(--muted);
  cursor: pointer; transition: all 0.2s;
  min-height: 40px;
  -webkit-tap-highlight-color: transparent;
}
.copy-btn:hover { color: var(--cyan); border-color: var(--cyan); }
.section-label {
  font-family: 'Rajdhani', sans-serif;
  font-size: 10px; letter-spacing: 3px;
  color: var(--cyan); margin: 18px 0 8px; font-weight: 600;
}
.complexity-row {
  display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px;
}
.complexity-badge {
  border: 1px solid var(--border);
  padding: 7px 12px; font-size: 11px; background: var(--panel);
  white-space: nowrap;
}
.complexity-badge span { color: var(--gold); font-family: 'VT323', monospace; font-size: 17px; }

/* ── MOBILE ───────────────────────────────────────────────────── */
@media (max-width: 480px) {
  .controls { gap: 8px; }
  .btn { flex: 1 1 calc(50% - 4px); text-align: center; justify-content: center; }
  .speed-sel { flex: 1 1 100%; }
  .header-right { font-size: 9px; }
  .panel { padding: 12px; }
}