/* ============================================================
   vv-report · 印刷感学术工具风 · 设计 Token
   ============================================================ */

:root {
  /* === 色彩：基础 === */
  --ink: #0D0D0D;
  --paper: #F4F1EA;
  --cream: #EDE9DF;
  --warm-mid: #C8BFA8;
  --border: rgba(13, 13, 13, 0.12);

  /* === 色彩：强调 === */
  --accent: #1A3E6E;        /* 深海蓝：主强调 */
  --blue: #1A3E6E;
  --accent-light: rgba(26, 62, 110, 0.08);
  --accent2: #C8410A;       /* 赭石橙：次强调 */

  /* === 字体族 === */
  --serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --mono: 'DM Mono', 'SF Mono', Menlo, Consolas, monospace;

  /* === 间距 === */
  --section-padding: 96px 48px;
  --hero-padding: 120px 48px 80px;
  --cta-padding: 100px 48px;
  --nav-height: 56px;
}

/* ============================================================
   Global Reset & Base
   ============================================================ */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 400;
  line-height: 1.75;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  position: relative;
}

/* 纸张纹理 overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1000;
  opacity: 0.6;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='300' height='300'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.05  0 0 0 0 0.05  0 0 0 0 0.05  0 0 0 0.18 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}

a {
  color: inherit;
  text-decoration: none;
}

em {
  font-style: normal;
  color: var(--accent2);
}

/* Section 分割线 */
section + section {
  border-top: 1px solid var(--border);
}

/* ============================================================
   Typography Utilities
   ============================================================ */

.section-label {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(13, 13, 13, 0.35);
  margin-bottom: 32px;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
}

.hero-rule {
  width: 48px;
  height: 2px;
  background: var(--accent);
  margin-bottom: 28px;
  transform-origin: left;
  animation: slideIn 0.7s ease 0.1s both;
}

/* ============================================================
   Nav
   ============================================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  padding: 0 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(244, 241, 234, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.nav-brand {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 36px;
}

.nav-links a {
  font-size: 13px;
  color: rgba(13, 13, 13, 0.5);
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--ink);
}

.nav-cta {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  background: var(--ink);
  color: var(--paper);
  padding: 7px 18px;
  transition: opacity 0.2s ease;
}

.nav-cta:hover {
  opacity: 0.75;
}

/* ============================================================
   Hero
   ============================================================ */

.hero {
  position: relative;
  padding: var(--hero-padding);
  padding-top: calc(var(--nav-height) + 80px);
  overflow: hidden;
}

.hero-bg-type {
  position: absolute;
  right: -0.05em;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(200px, 25vw, 320px);
  color: rgba(13, 13, 13, 0.04);
  line-height: 1;
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
}

.hero-inner {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
}

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(48px, 7vw, 88px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 32px;
  max-width: 900px;
  animation: fadeUp 0.7s ease 0.15s both;
}

.hero-desc {
  font-size: 17px;
  font-weight: 300;
  line-height: 1.8;
  color: rgba(13, 13, 13, 0.65);
  max-width: 640px;
  animation: fadeUp 0.7s ease 0.25s both;
}

.hero-meta {
  margin-top: 48px;
  display: flex;
  gap: 48px;
  animation: fadeUp 0.7s ease 0.35s both;
}

.hero-meta-item {
  min-width: 120px;
}

.hero-meta-key {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: rgba(13, 13, 13, 0.4);
  margin-bottom: 6px;
  text-transform: uppercase;
}

.hero-meta-val {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
}

/* ============================================================
   Section Base
   ============================================================ */

.section {
  padding: var(--section-padding);
}

.section-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-family: var(--serif);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  max-width: 800px;
}

.section-desc {
  font-size: 17px;
  font-weight: 300;
  line-height: 1.8;
  color: rgba(13, 13, 13, 0.65);
  max-width: 720px;
  margin-bottom: 52px;
}

/* ============================================================
   Mosaic Grid (2px gap 拼贴)
   ============================================================ */

.mosaic {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  background: var(--border);
  border: 1px solid var(--border);
}

.mosaic.cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

.mosaic-cell {
  background: var(--paper);
  padding: 40px;
  min-height: 220px;
  position: relative;
}

.mosaic-cell.dark {
  background: var(--ink);
  color: var(--paper);
}

.mosaic-cell .cell-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 16px;
  display: block;
}

.mosaic-cell.dark .cell-num {
  color: rgba(244, 241, 234, 0.6);
}

.mosaic-cell .cell-title {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 14px;
}

.mosaic-cell .cell-body {
  font-size: 13px;
  line-height: 1.75;
  color: rgba(13, 13, 13, 0.65);
}

.mosaic-cell.dark .cell-body {
  color: rgba(244, 241, 234, 0.7);
}

/* ============================================================
   Step Card
   ============================================================ */

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--border);
  border: 1px solid var(--border);
}

.step {
  background: var(--paper);
  padding: 36px 32px;
  transition: background 0.25s ease;
}

.step:hover {
  background: var(--cream);
}

.step-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 20px;
  display: block;
}

.step-icon {
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-family: var(--serif);
  font-size: 18px;
}

.step-title {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.step-body {
  font-size: 13px;
  color: rgba(13, 13, 13, 0.65);
}

/* ============================================================
   Big Decorative Number
   ============================================================ */

.big-number {
  font-family: var(--serif);
  font-size: 72px;
  font-weight: 700;
  line-height: 1;
  color: var(--accent2);
}

/* ============================================================
   Tech Chip
   ============================================================ */

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.chip {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  padding: 6px 12px;
  border: 1px solid var(--border);
  color: rgba(13, 13, 13, 0.55);
}

.chip.active {
  background: var(--accent-light);
  border-color: rgba(26, 62, 110, 0.2);
  color: var(--accent);
}

/* ============================================================
   Field Row (key-value)
   ============================================================ */

.field-rows {
  border-top: 1px solid var(--border);
}

.field-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.field-key {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: rgba(13, 13, 13, 0.4);
  text-transform: uppercase;
}

.field-val {
  font-weight: 500;
  font-size: 15px;
}

/* ============================================================
   Left-border emphasis card
   ============================================================ */

.highlight-card {
  padding: 32px 36px;
  background: var(--cream);
  border-left: 2px solid var(--accent);
  margin: 24px 0;
}

.highlight-card.alt {
  border-left-color: var(--accent2);
}

/* ============================================================
   Two-column (PM Reflection 式)
   ============================================================ */

.two-col {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
}

/* ============================================================
   Buttons
   ============================================================ */

.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  padding: 14px 30px;
  background: var(--ink);
  color: var(--paper);
  transition: background 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn:hover {
  background: var(--accent);
}

.btn.secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: rgba(13, 13, 13, 0.6);
}

.btn.secondary:hover {
  border-color: var(--ink);
  color: var(--ink);
  background: transparent;
}

/* ============================================================
   CTA Section
   ============================================================ */

.cta {
  padding: var(--cta-padding);
  text-align: center;
  background: var(--cream);
}

.cta h2 {
  font-family: var(--serif);
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.cta p {
  font-size: 17px;
  color: rgba(13, 13, 13, 0.65);
  max-width: 560px;
  margin: 0 auto 36px;
}

.cta .btn {
  background: var(--accent);
}

.cta .btn:hover {
  background: var(--paper);
  color: var(--ink);
}

/* ============================================================
   Footer
   ============================================================ */

.footer {
  padding: 28px 48px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(13, 13, 13, 0.35);
  text-transform: uppercase;
}

/* ============================================================
   Reveal Animations
   ============================================================ */

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ============================================================
   Responsive
   ============================================================ */

/* ============================================================
   Report-specific extensions · AI 时代
   ============================================================ */

/* Hero meta 三列对齐 */
.hero-meta {
  flex-wrap: wrap;
}

/* 大编号卡片列表（用于 3 类淘汰、4 类不失业、3 类大有可为）*/
.numlist {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  background: var(--border);
  border: 1px solid var(--border);
}

.numlist-item {
  background: var(--paper);
  padding: 40px 44px;
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 36px;
  align-items: start;
  transition: background 0.25s ease;
}

.numlist-item:hover {
  background: var(--cream);
}

.numlist-item.accent {
  background: var(--ink);
  color: var(--paper);
}

.numlist-item .num-col {
  font-family: var(--serif);
  font-size: 64px;
  font-weight: 700;
  line-height: 1;
  color: var(--accent2);
}

.numlist-item.accent .num-col {
  color: var(--paper);
}

.numlist-item .body-col .item-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
  display: block;
}

.numlist-item.accent .body-col .item-label {
  color: rgba(244, 241, 234, 0.65);
}

.numlist-item .body-col .item-title {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.numlist-item .body-col .item-body {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(13, 13, 13, 0.65);
  margin-bottom: 14px;
}

.numlist-item.accent .body-col .item-body {
  color: rgba(244, 241, 234, 0.75);
}

.numlist-item .body-col .item-example {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(13, 13, 13, 0.45);
  border-top: 1px dashed var(--border);
  padding-top: 12px;
  margin-top: 10px;
  text-transform: uppercase;
}

.numlist-item.accent .body-col .item-example {
  color: rgba(244, 241, 234, 0.55);
  border-top-color: rgba(244, 241, 234, 0.25);
}

.numlist-item .body-col .item-example em {
  color: var(--accent2);
  font-style: normal;
}

/* 工作流对比（Before / After） */
.workflow-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-top: 24px;
}

.workflow-col {
  background: var(--paper);
  padding: 40px 36px;
  min-height: 260px;
}

.workflow-col.after {
  background: var(--ink);
  color: var(--paper);
}

.workflow-col .wf-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(13, 13, 13, 0.4);
  margin-bottom: 14px;
}

.workflow-col.after .wf-label {
  color: rgba(244, 241, 234, 0.5);
}

.workflow-col .wf-title {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 28px;
}

.workflow-chain {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.workflow-chain li {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  line-height: 1.5;
  padding-left: 22px;
  position: relative;
  color: rgba(13, 13, 13, 0.75);
}

.workflow-col.after .workflow-chain li {
  color: rgba(244, 241, 234, 0.85);
}

.workflow-chain li::before {
  content: "→";
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--serif);
  color: var(--accent);
}

.workflow-col.after .workflow-chain li::before {
  color: var(--accent2);
}

/* 游戏岗位矩阵 */
.role-matrix {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: var(--border);
  border: 1px solid var(--border);
}

.role-cell {
  background: var(--paper);
  padding: 32px 28px;
  transition: background 0.25s ease;
}

.role-cell:hover {
  background: var(--cream);
}

.role-cell .role-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
  display: block;
}

.role-cell .role-name {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.role-cell .role-line {
  font-size: 13px;
  line-height: 1.75;
  color: rgba(13, 13, 13, 0.65);
}

.role-cell .role-line em {
  color: var(--accent2);
  font-style: normal;
  font-weight: 500;
}

/* 大引言块 */
.pullquote {
  font-family: var(--serif);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  padding: 40px 0 20px;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--border);
  margin: 40px 0;
  max-width: 900px;
}

.pullquote em {
  color: var(--accent2);
  font-style: normal;
}

.pullquote .pq-source {
  display: block;
  margin-top: 24px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(13, 13, 13, 0.4);
  font-weight: 400;
}

/* 建议三步 */
.advice-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-top: 40px;
}

.advice-cell {
  background: var(--paper);
  padding: 44px 36px;
  min-height: 320px;
  position: relative;
}

.advice-cell:first-child {
  background: var(--ink);
  color: var(--paper);
}

.advice-cell .advice-num {
  font-family: var(--serif);
  font-size: 64px;
  font-weight: 700;
  line-height: 1;
  color: rgba(13, 13, 13, 0.1);
  margin-bottom: 18px;
}

.advice-cell:first-child .advice-num {
  color: rgba(244, 241, 234, 0.2);
}

.advice-cell .advice-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
  display: block;
}

.advice-cell:first-child .advice-tag {
  color: var(--accent2);
}

.advice-cell .advice-title {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 14px;
}

.advice-cell .advice-body {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(13, 13, 13, 0.65);
}

.advice-cell:first-child .advice-body {
  color: rgba(244, 241, 234, 0.75);
}

/* 结语段 */
.closing {
  max-width: 880px;
  margin: 0 auto;
  font-family: var(--serif);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 400;
  line-height: 1.6;
  color: var(--ink);
}

.closing em {
  color: var(--accent2);
  font-style: normal;
  font-weight: 700;
}

.closing strong {
  font-weight: 700;
}

/* 大 Section 装饰数字 */
.decor-num {
  font-family: var(--serif);
  font-size: clamp(120px, 14vw, 180px);
  font-weight: 700;
  line-height: 0.9;
  color: rgba(13, 13, 13, 0.05);
  position: absolute;
  right: 48px;
  top: 72px;
  pointer-events: none;
  user-select: none;
  letter-spacing: -0.04em;
}

.section {
  position: relative;
}

/* 响应式扩展 */
@media (max-width: 900px) {
  .nav {
    padding: 0 24px;
  }

  .nav-links {
    display: none;
  }

  .section {
    padding: 64px 24px;
  }

  .hero {
    padding: 100px 24px 60px;
    padding-top: calc(var(--nav-height) + 60px);
  }

  .hero-bg-type {
    display: none;
  }

  .hero-meta {
    flex-direction: column;
    gap: 24px;
  }

  .mosaic,
  .mosaic.cols-3,
  .steps {
    grid-template-columns: 1fr;
  }

  .two-col {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .cta {
    padding: 64px 24px;
  }

  .footer {
    flex-direction: column;
    gap: 12px;
    padding: 24px;
    text-align: center;
  }

  .numlist-item {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 32px 24px;
  }

  .numlist-item .num-col {
    font-size: 48px;
  }

  .workflow-compare,
  .role-matrix,
  .advice-grid {
    grid-template-columns: 1fr;
  }

  .decor-num {
    right: 24px;
    top: 48px;
    font-size: 80px;
  }

  .pullquote {
    font-size: 20px;
    padding: 28px 0 16px;
  }
}