/* OPC就业图鉴 — 全局基础：色彩 / 字体 / 版式 / 质感 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600;700&family=Noto+Sans+SC:wght@400;500;700&family=IBM+Plex+Mono:wght@400;500;600&family=Playfair+Display:ital,wght@1,500;1,600&display=swap');

:root {
  --bg-main: #090907;
  --bg-main-alt: #0E0D0A;
  --bg-module: #15130E;
  --bg-module-alt: #1A1812;
  --text-primary: #E8E1D2;
  --text-secondary: #8F8A7B;
  --accent-gold: #D69A3A;
  --accent-teal: #6FAE9F;
  --accent-rust: #B5523A;
  --border-line: rgba(214, 154, 58, 0.22);
  --grid-line: rgba(232, 225, 210, 0.06);
  --ease-archive: cubic-bezier(0.22, 1, 0.36, 1);
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --font-mono: "IBM Plex Mono", "Space Mono", ui-monospace, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  background: var(--bg-main);
}

body {
  font-family: var(--font-serif);
  color: var(--text-primary);
  background: var(--bg-main);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 纸张颗粒感 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 180px 180px;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--accent-gold);
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

ul,
ol {
  list-style: none;
}

/* —— 三类版式 —— */
.narrative {
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.8;
  padding: 0 24px;
}

.narrative p {
  margin-bottom: 28px;
  font-size: 17px;
  color: var(--text-primary);
}

.narrative .lead {
  font-size: 24px;
  line-height: 1.7;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 36px;
}

.section-narrative {
  padding: 140px 0;
}

.device-container {
  width: 1080px;
  max-width: 92vw;
  margin: 0 auto;
  padding: 100px 0;
}

.chart-container {
  width: 1080px;
  max-width: 92vw;
  margin: 0 auto;
  padding: 100px 0;
}

/* —— 档案页堆叠滚动 —— */
.archive-page {
  position: relative;
  min-height: auto;
  opacity: 0.45;
  transform: scale(0.96);
  transition:
    opacity 600ms var(--ease-archive),
    transform 600ms var(--ease-archive);
  will-change: opacity, transform;
}

.archive-page.is-active {
  opacity: 1;
  transform: scale(1);
}

.archive-page:nth-child(even) {
  background: var(--bg-main-alt);
}

.archive-page:nth-child(odd) {
  background: var(--bg-main);
}

/* —— 文字层级 —— */
.mono {
  font-family: var(--font-mono);
}

.sans {
  font-family: var(--font-sans);
}

.text-gold {
  color: var(--accent-gold);
}

.text-teal {
  color: var(--accent-teal);
}

.text-rust {
  color: var(--accent-rust);
}

.chart-bridge {
  max-width: 640px;
  margin: 0 auto;
  padding: 96px 24px;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-primary);
  text-align: left;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  min-height: 320px;
}

.chart-bridge + .chart-block,
.chart-block + .chart-bridge {
  margin-top: 0;
}

.stat-embed {
  margin: 48px 0;
  text-align: center;
}

.stat-embed .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(48px, 8vw, 72px);
  color: var(--accent-gold);
  line-height: 1.1;
  letter-spacing: 0.04em;
}

.stat-embed .stat-label {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 8px;
}

.gold-line {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--border-line);
  margin: 40px 0;
}

.gold-quote {
  max-width: 640px;
  margin: 100px auto;
  padding: 48px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.gold-quote p {
  font-size: clamp(22px, 3.5vw, 28px);
  line-height: 1.75;
  color: var(--accent-gold);
  letter-spacing: 0.04em;
  border-left: none;
  border-top: 1px solid var(--accent-gold);
  border-bottom: 1px solid var(--accent-gold);
  padding: 28px 8px;
  text-align: center;
  max-width: 520px;
}

/* —— 章节封条 —— */
.archive-seal {
  padding: 180px 24px;
  text-align: center;
  position: relative;
}

.archive-seal::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 40% at 50% 50%, rgba(214, 154, 58, 0.06), transparent 70%);
  pointer-events: none;
}

.archive-seal .seal-code {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--accent-gold);
  margin-bottom: 28px;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 700ms var(--ease-archive), transform 700ms var(--ease-archive);
}

.archive-seal .seal-line {
  width: 0;
  height: 1px;
  background: var(--accent-gold);
  margin: 0 auto 32px;
  opacity: 0.55;
  transition: width 900ms var(--ease-archive);
}

.archive-seal .seal-title {
  font-family: var(--font-serif);
  font-size: clamp(20px, 3vw, 28px);
  color: var(--text-primary);
  font-weight: 400;
  letter-spacing: 0.04em;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 700ms 150ms var(--ease-archive), transform 700ms 150ms var(--ease-archive);
}

.archive-seal.is-active .seal-code,
.archive-seal.is-active .seal-title {
  opacity: 1;
  transform: translateY(0);
}

.archive-seal.is-active .seal-line {
  width: min(320px, 60vw);
}

/* —— 图表占位 —— */
.chart-block {
  border: 1px solid rgba(184, 151, 62, 0.4);
  background: var(--bg-module);
  padding: 0;
  position: relative;
  transition: border-color 400ms ease-out;
  margin-bottom: 48px;
}

.chart-block:hover {
  border-color: rgba(184, 151, 62, 0.7);
}

.chart-frame {
  position: relative;
  min-height: 280px;
  padding: 28px 28px 20px;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 40px 40px;
}

.chart-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: #8c8776;
  letter-spacing: 0.08em;
}

.chart-index {
  position: absolute;
  top: 20px;
  right: 24px;
  font-family: var(--font-mono);
  font-size: 28px;
  color: var(--accent-gold);
  letter-spacing: 0.05em;
}

.chart-method-btn {
  position: absolute;
  top: 22px;
  right: 64px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  border: 1px solid var(--border-line);
  padding: 4px 10px;
  transition: color 300ms, border-color 300ms;
}

.chart-method-btn:hover {
  color: var(--accent-gold);
  border-color: var(--accent-gold);
}

.chart-mount {
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 16px;
}

.chart-mount .placeholder-hint {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text-secondary);
  text-align: center;
  max-width: 420px;
  line-height: 1.7;
  padding: 24px;
}

.chart-block figcaption {
  border-top: 1px solid var(--border-line);
  padding: 20px 28px 24px;
  background: var(--bg-module-alt);
}

.chart-title {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--text-primary);
  margin-bottom: 10px;
  font-weight: 600;
}

.chart-question,
.chart-explain {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.65;
  opacity: 0.9;
}

.chart-source,
.chart-note {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-top: 6px;
}

.chart-method-panel {
  display: none;
  border-top: 1px solid var(--border-line);
  padding: 16px 28px 20px;
  background: var(--bg-main);
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.chart-method-panel.is-open {
  display: block;
}

.chart-method-panel strong {
  color: var(--accent-gold);
  font-weight: 500;
}

/* —— 响应式 —— */
@media (max-width: 768px) {
  .section-narrative {
    padding: 80px 0;
  }

  .device-container,
  .chart-container {
    padding: 60px 0;
  }

  .narrative .lead {
    font-size: 20px;
  }

  .archive-seal {
    padding: 120px 20px;
  }

  .chart-frame {
    min-height: 200px;
    padding: 20px;
  }

  .chart-method-btn {
    right: 52px;
    top: 18px;
  }
}