/* ==============================================
   SEO Edu — Unified Theme (Light)
   White background, black text, red accent
   ============================================== */

/* --- CSS Variables (Light theme) --- */
:root {
  --bg: #ffffff;
  --bg-elev: #f5f5f5;
  --bg-card: #f0f0f0;
  --text: #1a1a1a;
  --text-dim: #555555;
  --text-subtle: #999999;
  --accent: #fd212c;
  --accent-dim: #d91b25;
  --accent-soft: rgba(253,33,44,0.08);
  --border: #e0e0e0;
  --warn: #f59e0b;
  --danger: #ef4444;
  --link: #2563eb;
}

/* --- Base --- */
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; background: var(--bg) !important; }
body {
  background: var(--bg) !important;
  color: var(--text);
  font-family: 'Inter', -apple-system, 'Segoe UI', system-ui, sans-serif;
}

/* --- Reveal core overrides --- */
.reveal-viewport { background: var(--bg) !important; }
.reveal { font-size: 26px; color: var(--text) !important; background: var(--bg); }
.reveal .slides { text-align: left; }
.reveal .slides section { color: var(--text) !important; }
.reveal section { padding: 30px 50px; }

/* --- Typography --- */
.reveal h1, .reveal h2, .reveal h3, .reveal h4, .reveal h5, .reveal h6 {
  color: #1a1a1a !important;
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  letter-spacing: -0.03em;
  text-transform: none;
  margin-top: 0;
  margin-bottom: 18px;
  text-shadow: none;
}
.reveal h1 { font-size: 2.6em; line-height: 1.1; }
.reveal h2 { font-size: 1.6em; line-height: 1.2; }
.reveal h3 {
  font-size: 0.85em;
  color: var(--accent) !important;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.reveal h4 {
  font-size: 1em;
  color: var(--accent) !important;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.reveal p { line-height: 1.5; color: var(--text); }
.reveal li { color: var(--text); }
.reveal section > * { color: var(--text); }
.reveal b, .reveal strong { color: #000000; font-weight: 700; }

/* --- Lists --- */
.reveal ul, .reveal ol { line-height: 1.7; margin: 0.5em 0; }
.reveal ul li { list-style: none; padding-left: 28px; position: relative; margin-bottom: 6px; }
.reveal ul li::before {
  content: '▸';
  color: var(--accent);
  position: absolute;
  left: 0;
  font-weight: bold;
}
.reveal ol { padding-left: 32px; }
.reveal ol li { margin-bottom: 6px; }

/* --- Links --- */
.reveal a { color: var(--link); text-decoration: none; }
.reveal a:hover { text-decoration: underline; }

/* --- Code --- */
.reveal code, .reveal pre {
  font-family: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
}
.reveal code { background: var(--bg-elev); color: var(--accent); padding: 2px 8px; border-radius: 4px; font-size: 0.85em; }
.reveal pre {
  background: var(--bg-card);
  padding: 20px;
  border-radius: 10px;
  border-left: 4px solid var(--accent);
  font-size: 0.7em;
  line-height: 1.5;
  overflow: auto;
}

/* --- Tables --- */
.reveal table { font-size: 0.7em; border-collapse: collapse; width: 100%; color: var(--text); }
.reveal table th, .reveal table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  color: var(--text);
}
.reveal table th { background: var(--bg-elev); color: var(--accent) !important; font-weight: 600; }
.reveal table tr:hover td { background: var(--bg-elev); }

/* --- Module Tag --- */
.module-tag {
  display: inline-block;
  font-size: 0.55em;
  border-radius: 0;
  background: var(--accent);
  color: #ffffff;
  padding: 6px 14px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 30px;
  border: 1px solid var(--accent-dim);
}

/* --- Title Slide --- */
.title-slide {
  height: 100%;
  display: flex !important;
  flex-direction: column;
  justify-content: center;
}
.title-slide h1 { font-size: 4em; }
.title-slide .subtitle { font-size: 1.6em; color: var(--text-dim); margin-top: 20px; }
.title-slide .meta { font-size: 0.8em; color: var(--text-dim); margin-top: 60px; border-top: 1px solid var(--border); padding-top: 20px; }

/* --- Slide Number / Tag --- */
.slide-num {
  position: absolute;
  bottom: 20px;
  right: 30px;
  font-size: 0.5em;
  color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.1em;
}
.slide-tag {
  position: absolute;
  top: 25px;
  right: 30px;
  max-width: 36%;
  font-size: 0.45em;
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 0;
  padding: 5px 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: right;
  z-index: 5;
}
.reveal section > h2:first-of-type,
.reveal section .slide-tag + h2 {
  padding-right: 38%;
}

/* --- Cards --- */
.card {
  background: var(--bg-card);
  border-radius: 4px;
  padding: 24px 28px;
  border-left: 2px solid var(--accent);
  margin: 16px 0;
}
.card.warn { border-left-color: var(--warn); }
.card.danger { border-left-color: var(--danger); }
.card .label {
  font-size: 0.6em;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 8px;
  font-weight: 600;
}

/* --- Grid Layouts --- */
.grid-2, .grid-3, .grid-4 { display: grid; gap: 20px; margin: 20px 0; }
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-3 { grid-template-columns: 1fr 1fr 1fr; }
.grid-4 { grid-template-columns: 1fr 1fr 1fr 1fr; }

/* --- Tiles --- */
.tile {
  background: var(--bg-card);
  border-radius: 4px;
  padding: 22px;
  border-top: 3px solid var(--accent);
  font-size: 0.85em;
  border-left-width: 2px;
}
.tile .icon { font-size: 1.8em; margin-bottom: 10px; }
.tile h4 { color: var(--accent); margin-bottom: 8px; font-size: 1em; }
.tile p { color: var(--text-dim); margin: 0; font-size: 0.95em; }

/* --- Flow (step diagrams) --- */
.flow {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 6px;
  margin: 30px 0;
  flex-wrap: wrap;
}
.flow-step {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 10px;
  padding: 12px 8px;
  font-size: 0.6em;
  font-weight: 600;
  text-align: center;
  flex: 1 1 0;
  min-width: 0;
  word-break: break-word;
  overflow-wrap: anywhere;
  hyphens: auto;
  line-height: 1.25;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.flow-step .icon, .flow-step > br + * { margin-top: 4px; }
.flow-step.accent { border-color: var(--accent); color: var(--accent); }
.flow-arrow { color: var(--accent); font-size: 1.3em; }

/* --- KPI Row --- */
.kpi-row { display: flex; gap: 20px; margin: 24px 0; flex-wrap: wrap; }
.kpi {
  flex: 1;
  min-width: 140px;
  background: var(--bg-card);
  padding: 18px;
  border-radius: 10px;
  border-left: 3px solid var(--accent);
}
.kpi .num { font-size: 2em; color: var(--accent); font-weight: 700; line-height: 1; }
.kpi .label { color: var(--text-dim); font-size: 0.65em; margin-top: 6px; }

/* --- DR Scale --- */
.dr-scale {
  display: flex;
  border-radius: 8px;
  overflow: hidden;
  margin: 20px 0;
  font-size: 0.6em;
  font-weight: 600;
}
.dr-scale > div { padding: 14px 10px; text-align: center; flex: 1; color: #000; }
.dr-scale .dr-1 { background: #ff6b6b; }
.dr-scale .dr-2 { background: #ffc857; }
.dr-scale .dr-3 { background: #6dcc6d; }
.dr-scale .dr-4 { background: #00cc6a; }
.dr-scale .dr-5 { background: #00ff88; }

/* --- Callout --- */
.callout {
  background: linear-gradient(135deg, var(--accent-soft) 0%, transparent 100%);
  border-left: 4px solid var(--accent);
  padding: 20px 24px;
  border-radius: 10px;
  margin: 20px 0;
  font-size: 0.85em;
}
.callout .label { color: var(--accent); font-size: 0.65em; letter-spacing: 0.1em; text-transform: uppercase; font-weight: 600; margin-bottom: 8px; }

/* --- Timeline --- */
.timeline { margin: 20px 0; }
.timeline-row {
  display: grid;
  grid-template-columns: 100px 220px 1fr;
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  align-items: center;
  font-size: 0.7em;
}
.timeline-row .year { color: var(--accent); font-weight: 700; font-size: 1.3em; font-family: 'JetBrains Mono', monospace; }
.timeline-row .name { color: var(--text); font-weight: 600; }
.timeline-row .desc { color: var(--text-dim); }

/* --- Factor Blocks --- */
.factor-blocks { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 20px 0; }
.factor-block {
  background: var(--bg-card);
  padding: 20px 24px;
  border-radius: 4px;
  border-left: 2px solid var(--accent);
}
.factor-block h4 { color: var(--accent); margin: 0 0 10px 0; font-size: 1em; letter-spacing: 0.05em; }
.factor-block ul { font-size: 0.8em; line-height: 1.6; }

/* --- Intent Grid --- */
.intent-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 20px; }
.intent-card {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 20px;
  border-top: 4px solid var(--accent);
}
.intent-card .type { color: var(--accent); font-size: 0.7em; text-transform: uppercase; letter-spacing: 0.1em; font-weight: 700; }
.intent-card .example { font-family: 'JetBrains Mono', monospace; font-size: 0.85em; color: var(--text); margin: 6px 0 8px; }
.intent-card .desc { color: var(--text-dim); font-size: 0.7em; }

/* --- E-E-A-T Grid --- */
.eeat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 24px 0; }
.eeat-card {
  background: var(--bg-card);
  border-radius: 10px;
  padding: 18px;
  text-align: center;
  border-top: 3px solid var(--accent);
}
.eeat-card .letter { font-size: 2.5em; color: var(--accent); font-weight: 800; line-height: 1; }
.eeat-card .name { color: var(--text); font-size: 0.7em; margin: 6px 0 4px; font-weight: 600; }
.eeat-card .ru { color: var(--text-dim); font-size: 0.6em; }

/* --- HTML Example --- */
.html-example {
  background: #f8f8f8;
  border-radius: 10px;
  padding: 18px 22px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.65em;
  line-height: 1.6;
  overflow: auto;
  border: 1px solid var(--border);
}
.html-example .tag { color: #d63384; }
.html-example .attr { color: #6f42c1; }
.html-example .str { color: #0a58ca; }
.html-example .text { color: #1a1a1a; }
.html-example .com { color: var(--text-dim); }

/* --- Priority List --- */
.priority-list { counter-reset: prio; margin: 20px 0; }
.priority-item {
  counter-increment: prio;
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 20px;
  padding: 16px 20px;
  background: var(--bg-card);
  border-radius: 10px;
  margin-bottom: 12px;
  align-items: center;
  border-left: 3px solid var(--accent);
}
.priority-item::before {
  content: counter(prio);
  font-size: 2em;
  color: var(--accent);
  font-weight: 800;
  font-family: 'JetBrains Mono', monospace;
  text-align: center;
}
.priority-item .body h4 { color: var(--accent); margin: 0 0 4px 0; font-size: 0.95em; }
.priority-item .body p { color: var(--text-dim); font-size: 0.75em; margin: 0; }

/* --- Demo Steps --- */
.demo-list { counter-reset: demo; margin: 16px 0; }
.demo-step {
  counter-increment: demo;
  padding: 12px 16px 12px 60px;
  position: relative;
  border-bottom: 1px solid var(--border);
  font-size: 0.85em;
}
.demo-step::before {
  content: counter(demo);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.1em;
  font-weight: 700;
}

/* --- Homework Checklist --- */
.hw-checklist { background: var(--bg-card); padding: 24px 28px; border-radius: 12px; border-left: 4px solid var(--accent); margin: 16px 0; }
.hw-checklist h4 { color: var(--accent); margin-top: 0; }
.hw-checklist ol { font-size: 0.85em; }

/* --- Speaker Notes --- */
.reveal aside.notes {
  display: none;
}

/* --- Print --- */
@media print {
  .slide-num, .slide-tag { color: #888 !important; }
}

/* === Edit Mode UI === */
#edit-toolbar {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 9999;
  display: flex;
  gap: 8px;
  background: rgba(255,255,255,0.95);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px 10px;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  color: var(--text);
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  backdrop-filter: blur(8px);
}
#edit-toolbar.hidden { display: none; }
#edit-toolbar .btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  transition: all 0.15s;
}
#edit-toolbar .btn:hover { border-color: var(--accent); }
#edit-toolbar .btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); font-weight: 600; }
#edit-toolbar .btn.primary:hover { background: var(--accent-dim); }
#edit-toolbar .btn.danger { background: rgba(239,68,68,0.1); border-color: var(--danger); color: var(--danger); }
#edit-toolbar .status { font-size: 11px; color: var(--text-subtle); padding: 4px 6px; }
#edit-toolbar .status.ok { color: var(--accent); }
#edit-toolbar .status.err { color: var(--danger); }

body.edit-mode .reveal section [contenteditable="true"] {
  outline: 1px dashed rgba(253,33,44,0.3);
  outline-offset: 2px;
  border-radius: 4px;
  transition: outline-color 0.15s;
  cursor: text;
}
body.edit-mode .reveal section [contenteditable="true"]:hover {
  outline-color: var(--accent);
  background: rgba(253,33,44,0.04);
}
body.edit-mode .reveal section [contenteditable="true"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  background: rgba(253,33,44,0.06);
}