/* ========================================================================
   中断系统 教学幻灯片 — 全局样式
   ======================================================================== */

:root {
  --ink: #1a1f2e;
  --ink-2: #36404f;
  --ink-3: #5a6478;
  --paper: #f5f1e8;
  --paper-2: #ebe4d3;
  --rule: #c9bfa8;
  --rule-soft: #d9d0bb;

  --red: #c8533c;
  --red-soft: #e9b8ac;
  --blue: #355a82;
  --blue-soft: #b9cadc;
  --gold: #b88a2e;
  --green: #4a6b4a;
  --violet: #6b4a82;

  --mono: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, monospace;
  --sans: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
  --serif: "Source Serif 4", "Noto Serif SC", "Songti SC", serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: #0d1117;
  font-family: var(--sans);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

deck-stage {
  background: #0d1117;
}

deck-stage section {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  position: relative;
  overflow: hidden;
}

/* paper grain */
deck-stage section::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 25% 30%, rgba(0,0,0,0.012) 0%, transparent 50%),
    radial-gradient(circle at 75% 70%, rgba(0,0,0,0.012) 0%, transparent 50%);
  background-size: 600px 600px;
  z-index: 0;
}

/* base layout helpers */
.slide-pad {
  position: absolute;
  inset: 0;
  padding: 80px 100px;
  display: flex;
  flex-direction: column;
  z-index: 1;
}

/* ---- Chrome: header rule + section tag + page number ---- */
.slide-chrome {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.18em;
  color: var(--ink-3);
  text-transform: uppercase;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 18px;
  margin-bottom: 48px;
}
.slide-chrome .ch-left { display: flex; gap: 32px; align-items: center; }
.slide-chrome .ch-tag {
  background: var(--ink);
  color: var(--paper);
  padding: 4px 12px;
  font-size: 12px;
  letter-spacing: 0.24em;
}
.slide-chrome .ch-pageno {
  display: flex;
  gap: 16px;
  align-items: baseline;
}
.slide-chrome .ch-pageno b {
  color: var(--ink);
  font-weight: 700;
  font-size: 18px;
}

/* ---- Section titles ---- */
.s-title {
  font-family: var(--sans);
  font-weight: 800;
  font-size: 72px;
  line-height: 1.05;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin: 0;
}
.s-title em {
  font-style: normal;
  color: var(--red);
}
.s-subtitle {
  font-size: 26px;
  color: var(--ink-2);
  font-weight: 400;
  letter-spacing: 0.02em;
  margin-top: 20px;
  line-height: 1.4;
}

/* mini labels */
.kicker {
  font-family: var(--mono);
  font-size: 16px;
  letter-spacing: 0.28em;
  color: var(--red);
  text-transform: uppercase;
  margin-bottom: 18px;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--ink-3);
  text-transform: uppercase;
}

/* card surfaces */
.card {
  background: #ffffff;
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 32px;
  position: relative;
}
.card.flat {
  background: var(--paper-2);
  border: 1px solid var(--rule);
}
.card .card-tag {
  position: absolute;
  top: -10px;
  left: 24px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  padding: 2px 10px;
}
.card h3 {
  margin: 0 0 12px;
  font-size: 28px;
  font-weight: 700;
}
.card p {
  margin: 0;
  font-size: 19px;
  line-height: 1.55;
  color: var(--ink-2);
}

/* numbered step bubble */
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-weight: 700;
  font-size: 20px;
  flex-shrink: 0;
}
.step-num.red { background: var(--red); }
.step-num.blue { background: var(--blue); }

/* code-ish */
code, .mono {
  font-family: var(--mono);
  background: var(--paper-2);
  padding: 1px 8px;
  border-radius: 3px;
  font-size: 0.92em;
  border: 1px solid var(--rule-soft);
  color: var(--ink);
}

/* keys / signal pills */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  background: var(--ink);
  color: var(--paper);
  letter-spacing: 0.08em;
}
.pill.red { background: var(--red); }
.pill.blue { background: var(--blue); }
.pill.gold { background: var(--gold); }
.pill.outline {
  background: transparent;
  color: var(--ink);
  border: 1.5px solid var(--ink);
}

/* corner stamp */
.stamp {
  position: absolute;
  bottom: 36px;
  right: 60px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--ink-3);
  text-transform: uppercase;
}

/* shared svg/diagram styles */
.diagram-frame {
  background: #ffffff;
  border: 1px solid var(--rule);
  position: relative;
  overflow: hidden;
}
.diagram-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(0,0,0,0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0,0,0,0.025) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

/* Misc */
.divider {
  height: 1px;
  background: var(--rule);
  margin: 24px 0;
}