/* =========================================================
   AI เพื่องานวิชาการครู — Workshop Deck
   Warm, editorial, Claude-inspired light theme
   ========================================================= */

:root {
  --bg: #F5F1EB;          /* warm off-white */
  --bg-card: #FAF7F2;
  --bg-panel: #EEE7DB;
  --ink: #1F1E1D;          /* near-black warm */
  --ink-soft: #56524C;
  --ink-mute: #8A847B;
  --rule: #DCD3C3;
  --accent: #CC785C;       /* warm clay */
  --accent-deep: #A85A3E;
  --ok: #5C7A4E;
  --warn: #B86A3C;
  --danger: #A64B3E;
  --claude: #CC785C;
}

/* Google Fonts loaded from index */
* { box-sizing: border-box; }

deck-stage {
  font-family: "Styrene B", "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
}

section.slide {
  background: var(--bg);
  color: var(--ink);
  padding: 100px 120px 80px 120px;
  display: flex;
  flex-direction: column;
  font-family: "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-feature-settings: "ss01";
  position: relative;
}

.slide.alt { background: var(--bg-panel); }
.slide.dark { background: #1F1E1D; color: #F5F1EB; }
.slide.dark .ink { color: #F5F1EB; }
.slide.dark .muted { color: #B9B0A2; }
.slide.dark .rule { background: #3A3732; }

/* Typography */
.serif { font-family: "Source Serif 4", "Tiempos Text", Georgia, serif; font-weight: 400; letter-spacing: -0.01em; }
.mono { font-family: "JetBrains Mono", "SF Mono", Menlo, monospace; }

.eyebrow {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
.eyebrow.soft { color: var(--ink-mute); }

.title {
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 400;
  font-size: 84px;
  line-height: 1.02;
  letter-spacing: -0.022em;
  color: var(--ink);
  text-wrap: pretty;
}
.title-sm {
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 400;
  font-size: 60px;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.subtitle {
  font-size: 38px;
  line-height: 1.35;
  color: var(--ink-soft);
  font-weight: 400;
  max-width: 1400px;
}
.body {
  font-size: 34px;
  line-height: 1.45;
  color: var(--ink-soft);
}
.small { font-size: 26px; color: var(--ink-mute); }
.muted { color: var(--ink-mute); }
.ink { color: var(--ink); }

/* Header bar */
.slide-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 22px;
  color: var(--ink-mute);
  letter-spacing: 0.04em;
  margin-bottom: 72px;
}
.slide-header .brand { display: flex; align-items: center; gap: 12px; }
.slide-header .brand .dot {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent);
}
.slide-header .section-tag {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 500;
}

.rule {
  height: 1px;
  background: var(--rule);
  width: 100%;
}

.slide-footer {
  position: absolute;
  left: 120px;
  right: 120px;
  bottom: 48px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 20px;
  color: var(--ink-mute);
  letter-spacing: 0.04em;
}

/* Cover */
section.slide.cover {
  padding: 0;
  background: var(--bg);
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  grid-template-rows: 1fr;
  flex-direction: unset;
  min-height: 100%;
}
.cover-left {
  padding: 120px 100px 80px 120px;
  display: flex; flex-direction: column; justify-content: space-between;
}
.cover-right {
  background: linear-gradient(180deg, #E9E0CF 0%, #D9C9B0 100%);
  padding: 80px 80px;
  display: flex; flex-direction: column; justify-content: space-between;
  position: relative;
  overflow: hidden;
}
.cover-mark {
  width: 200px; height: 200px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 40px 120px rgba(204, 120, 92, 0.35);
}
.cover-title {
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 108px; line-height: 0.98; letter-spacing: -0.025em;
  color: var(--ink);
}
.cover-sub {
  font-size: 32px; color: var(--ink-soft); line-height: 1.4;
}
.cover-meta {
  display: grid; grid-template-columns: 1fr 1fr; gap: 32px 48px;
  font-size: 22px;
}
.cover-meta .k { color: var(--ink-mute); text-transform: uppercase; letter-spacing: 0.12em; font-size: 24px; font-weight: 500; margin-bottom: 6px; }
.cover-meta .v { color: var(--ink); font-weight: 500; font-size: 28px; }

.quote-block {
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 46px;
  line-height: 1.25;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.quote-block .big { font-size: 64px; display: block; }

/* Two columns */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; flex: 1; min-height: 0; }
.three-col { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 40px; flex: 1; min-height: 0; }

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: 18px;
  padding: 40px 44px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.card h3 {
  margin: 0;
  font-family: "Source Serif 4", Georgia, serif;
  font-weight: 400;
  font-size: 42px;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.card p { margin: 0; font-size: 30px; line-height: 1.45; color: var(--ink-soft); }

.chip {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--bg-panel);
  border: 1px solid var(--rule);
  font-size: 22px;
  color: var(--ink);
  letter-spacing: 0.02em;
  font-weight: 500;
}
.chip.claude { background: rgba(204,120,92,0.12); border-color: rgba(204,120,92,0.35); color: var(--accent-deep); }
.chip.gemini { background: rgba(76, 112, 168, 0.10); border-color: rgba(76,112,168,0.30); color: #3F5E8C; }
.chip.notebook { background: rgba(94, 128, 96, 0.10); border-color: rgba(94,128,96,0.28); color: #4C6B4E; }

/* Numbered list */
.num-list { counter-reset: n; display: flex; flex-direction: column; gap: 24px; margin: 0; padding: 0; list-style: none; }
.num-list li {
  list-style: none;
  position: relative;
  padding-left: 80px;
  font-size: 34px;
  line-height: 1.5;
  color: var(--ink);
  counter-increment: n;
}
.num-list li::before {
  content: counter(n);
  position: absolute;
  left: 0;
  top: 0;
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 40px;
  color: var(--accent);
  font-weight: 400;
  line-height: 1.35;
  width: 56px;
}
.num-list li b { font-weight: 600; color: var(--ink); }

/* Table */
.tbl { width: 100%; border-collapse: collapse; font-size: 24px; }
.tbl th, .tbl td {
  text-align: left;
  padding: 20px 20px;
  border-bottom: 1px solid var(--rule);
  color: var(--ink);
  vertical-align: top;
}
.tbl th {
  font-size: 20px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-mute);
  font-weight: 500;
  border-bottom: 1px solid var(--ink);
}
.tbl tr:last-child td { border-bottom: 0; }
.tbl .pain { font-size: 22px; color: var(--accent-deep); font-weight: 500; white-space: nowrap; }
.roi-tbl th, .roi-tbl td { padding: 10px 14px; }
.roi-tbl th { font-size: 16px; }
.tools-tbl td { padding: 24px 20px; vertical-align: top; font-size: 26px; line-height: 1.45; }
.tools-tbl th { font-size: 22px; }
.tools-tbl tr { border-top: 1px solid var(--rule); }
.tools-tbl tr:first-child { border-top: 0; }

/* UC brief grid */
.uc-grid { display: flex; flex-direction: column; gap: 14px; }
.uc-row { display: grid; grid-template-columns: 260px 1fr; gap: 28px; align-items: baseline; padding: 16px 22px; background: var(--bg-card); border: 1px solid var(--rule); border-radius: 12px; }
.uc-row.pain { background: rgba(166,75,62,0.06); border-color: rgba(166,75,62,0.25); }
.uc-row.why { background: rgba(204,120,92,0.08); border-color: rgba(204,120,92,0.28); }
.uc-key { font-size: 24px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-mute); font-weight: 500; display: flex; align-items: center; gap: 10px; }
.uc-row.pain .uc-key { color: var(--danger); }
.uc-row.why .uc-key { color: var(--accent-deep); }
.uc-val { font-size: 26px; line-height: 1.45; color: var(--ink); }
.pain-dot { width: 12px; height: 12px; border-radius: 50%; background: var(--danger); }

/* Section divider slide */
.section-cover {
  padding: 120px;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: center;
}
.section-cover .number {
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 260px;
  line-height: 1;
  color: var(--accent);
  letter-spacing: -0.04em;
}
.section-cover .label {
  font-size: 26px; text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--ink-mute); margin-bottom: 24px;
  font-weight: 500;
}

/* UC slide layout */
.uc-slide { display: grid; grid-template-rows: auto 1fr; gap: 40px; }
.uc-head {
  display: grid;
  grid-template-columns: 92px 1fr auto;
  gap: 32px;
  align-items: start;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 28px;
}
.uc-num {
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 88px; line-height: 0.95;
  color: var(--accent);
  letter-spacing: -0.03em;
}
.uc-title {
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 48px; line-height: 1.08;
  color: var(--ink);
  letter-spacing: -0.015em;
  text-wrap: balance;
}
.uc-group { font-size: 20px; text-transform: uppercase; letter-spacing: 0.14em; color: var(--ink-mute); margin-bottom: 14px; font-weight: 500; }

.uc-body { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; min-height: 0; }

.info-block { display: flex; flex-direction: column; gap: 12px; }
.info-block .lbl {
  font-size: 18px; text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--ink-mute); font-weight: 500;
}
.info-block .val { font-size: 26px; line-height: 1.4; color: var(--ink); }

.info-stack { display: flex; flex-direction: column; gap: 28px; }

.pain-box { background: rgba(166,75,62,0.06); border-left: 3px solid var(--danger); padding: 20px 24px; border-radius: 6px; }
.why-box { background: rgba(204,120,92,0.08); border-left: 3px solid var(--accent); padding: 20px 24px; border-radius: 6px; }
.save-box { background: rgba(94,128,96,0.10); border-left: 3px solid var(--ok); padding: 20px 24px; border-radius: 6px; }

.pill-row { display: flex; gap: 12px; flex-wrap: wrap; }

/* Prompt slide */
.prompt-slide { padding: 80px 100px 70px 100px; }
.prompt-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 28px; }
.prompt-title {
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 44px; color: var(--ink); letter-spacing: -0.01em;
}
.prompt-card {
  background: #1F1E1D;
  color: #F2EADB;
  border-radius: 20px;
  padding: 44px 52px;
  font-family: "JetBrains Mono", "SF Mono", Menlo, monospace;
  font-size: 20px;
  line-height: 1.55;
  white-space: pre-wrap;
  overflow: hidden;
  flex: 1;
  min-height: 0;
}
.prompt-card.two-col-prompt {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  padding: 40px 44px;
  font-size: 19px;
  line-height: 1.52;
}
.prompt-card .col { white-space: pre-wrap; }
.prompt-card .hl { color: #E8A87C; }
.prompt-card .em { color: #F5C98D; }
.prompt-card .k { color: #B9B0A2; }

/* Numbers / big stat */
.stat { font-family: "Source Serif 4", Georgia, serif; font-size: 220px; line-height: 0.9; color: var(--accent); letter-spacing: -0.04em; }
.stat-sm { font-family: "Source Serif 4", Georgia, serif; font-size: 120px; line-height: 0.95; color: var(--ink); letter-spacing: -0.03em; }
.stat-label { font-size: 24px; color: var(--ink-mute); text-transform: uppercase; letter-spacing: 0.14em; font-weight: 500; }

/* Warning list */
.warn-list { display: flex; flex-direction: column; gap: 20px; }
.warn-item {
  display: grid; grid-template-columns: 36px 1fr; gap: 20px;
  font-size: 26px; line-height: 1.4; color: var(--ink);
  align-items: baseline;
}
.warn-item::before {
  content: "⚠"; color: var(--warn); font-size: 28px;
}
.warn-item.ok::before { content: "✓"; color: var(--ok); }
.warn-item.dot::before { content: "●"; color: var(--accent); font-size: 14px; position: relative; top: -6px; }

/* Marker */
.marker {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 6px;
  background: rgba(204,120,92,0.14);
  color: var(--accent-deep);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

/* Key figure */
.kv { display: flex; flex-direction: column; gap: 8px; }
.kv .k { font-size: 20px; text-transform: uppercase; letter-spacing: 0.14em; color: var(--ink-mute); font-weight: 500; }
.kv .v { font-size: 32px; color: var(--ink); line-height: 1.3; }

/* Vertical scale helper — pad-bottom not empty = intentional whitespace */
.flex-col { display: flex; flex-direction: column; }
.flex-1 { flex: 1; min-height: 0; }
.mt-auto { margin-top: auto; }
.mb-auto { margin-bottom: auto; }
.gap-sm { gap: 14px; }
.gap-md { gap: 28px; }
.gap-lg { gap: 48px; }