/* ============================================================
   AI 行业趋势看板 — 研究简报风格
   主色：深靛蓝  强调：琥珀橙  中性：米白-暖灰  风险：砖红
   ============================================================ */

:root {
  /* 色彩系统 */
  --ink-900: #1a1f36;      /* 最深文字/标题 */
  --ink-800: #2a3150;
  --ink-700: #3d4666;
  --ink-600: #525c7a;
  --ink-500: #6b7390;
  --ink-400: #8c92ab;
  --ink-300: #b0b6c8;
  --ink-200: #d5d9e4;
  --ink-100: #ebeef5;
  --ink-50:  #f4f6fb;

  --paper: #faf8f3;        /* 米白底 */
  --paper-2: #f2efe7;      /* 次级纸面 */
  --paper-3: #e8e4d8;

  --indigo-700: #2d3a6b;   /* 主色 深靛蓝 */
  --indigo-600: #3b4b88;
  --indigo-500: #4d61a8;
  --indigo-400: #6b7fc0;
  --indigo-100: #e1e6f5;
  --indigo-50:  #eef1fa;

  --amber-600: #d88c2a;    /* 强调色 琥珀橙 */
  --amber-500: #e8a145;
  --amber-400: #f2b866;
  --amber-100: #fbe9cc;
  --amber-50:  #fdf4e3;

  --teal-600: #2d8a7a;
  --teal-500: #3ba894;
  --teal-100: #d0ebe5;

  --rose-600: #c24a3d;     /* 风险/警示 */
  --rose-500: #d85c4e;
  --rose-100: #f6d8d4;

  --violet-600: #6b4fa3;
  --violet-500: #8468c0;
  --violet-100: #e5dcf5;

  /* 字体 */
  --font-serif: 'Noto Serif SC', 'Songti SC', Georgia, serif;
  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

  /* 尺寸 */
  --max-width: 1440px;
  --section-gap: 48px;
  --card-radius: 3px;
  --border: 1px solid var(--ink-200);
  --border-dark: 1px solid var(--ink-300);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-700);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-variant-numeric: tabular-nums;
}

/* ============================================================
   顶部导航
   ============================================================ */
.top-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--ink-200);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px 32px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  background: var(--indigo-700);
  color: var(--paper);
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: -0.5px;
  border-radius: 2px;
}

.brand-text h1 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--ink-900);
  letter-spacing: 0.5px;
}

.subtitle {
  font-size: 12px;
  color: var(--ink-500);
  margin-top: 2px;
  letter-spacing: 0.3px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: 10.5px;
}

.header-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
}

.update-label {
  color: var(--ink-500);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.update-date {
  color: var(--ink-900);
  font-weight: 500;
  padding: 4px 10px;
  border: 1px solid var(--ink-200);
  border-radius: 2px;
  background: var(--paper-2);
}

.anchor-nav {
  border-top: 1px solid var(--ink-100);
  background: var(--paper-2);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  gap: 4px;
  overflow-x: auto;
}

.nav-link {
  padding: 11px 18px;
  font-size: 13px;
  color: var(--ink-600);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
  font-weight: 500;
}

.nav-link:hover {
  color: var(--indigo-700);
  border-bottom-color: var(--indigo-400);
}

.nav-link.active {
  color: var(--indigo-700);
  border-bottom-color: var(--indigo-700);
  font-weight: 700;
}

/* ============================================================
   主容器 & 分区
   ============================================================ */
.dashboard {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 36px 32px 48px;
}

.section {
  margin-bottom: var(--section-gap);
  scroll-margin-top: 120px;
}

.section-header {
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--ink-900);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--ink-900);
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.section-num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--amber-600);
  letter-spacing: 1px;
}

.section-desc {
  font-size: 13px;
  color: var(--ink-500);
  max-width: 500px;
}

/* ============================================================
   KPI 卡片带
   ============================================================ */
.kpi-strip {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--ink-200);
  border: 1px solid var(--ink-200);
  border-radius: 2px;
  overflow: hidden;
}

.kpi-card {
  background: var(--paper);
  padding: 22px 20px;
  cursor: help;
  position: relative;
  transition: background 0.2s ease;
}

.kpi-card:hover {
  background: var(--paper-2);
}

.kpi-label {
  font-size: 12px;
  color: var(--ink-500);
  margin-bottom: 8px;
  font-weight: 500;
  line-height: 1.4;
}

.kpi-value {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 700;
  color: var(--ink-900);
  line-height: 1.1;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.kpi-unit {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-600);
  margin-left: 4px;
  font-family: var(--font-sans);
}

.kpi-change {
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 6px;
}

.kpi-change.positive { color: var(--teal-600); }
.kpi-change.negative { color: var(--rose-600); }

.kpi-sub {
  font-size: 11.5px;
  color: var(--ink-500);
  margin-bottom: 6px;
  font-family: var(--font-mono);
}

.kpi-source {
  font-size: 10.5px;
  color: var(--ink-400);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  padding-top: 8px;
  border-top: 1px dashed var(--ink-100);
}

/* KPI tooltip */
.kpi-tooltip {
  position: fixed;
  z-index: 1000;
  background: var(--ink-900);
  color: var(--paper);
  padding: 10px 14px;
  border-radius: 3px;
  font-size: 12px;
  line-height: 1.5;
  max-width: 260px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.kpi-tooltip.visible { opacity: 1; }

/* ============================================================
   趋势卡片墙
   ============================================================ */
.trend-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.trend-card {
  background: var(--paper);
  border: 1px solid var(--ink-200);
  border-radius: 2px;
  padding: 22px 20px;
  position: relative;
  transition: all 0.2s ease;
}

.trend-card:hover {
  border-color: var(--indigo-400);
  transform: translateY(-1px);
}

.trend-card.accent {
  background: var(--indigo-700);
  border-color: var(--indigo-700);
  color: var(--paper);
}

.trend-card.accent .trend-index { color: var(--amber-400); }
.trend-card.accent .trend-title { color: var(--paper); }
.trend-card.accent .trend-conclusion { color: rgba(250,248,243,0.8); }
.trend-card.accent .trend-source { color: rgba(250,248,243,0.6); border-color: rgba(250,248,243,0.2); }
.trend-card.accent .tag {
  background: rgba(250,248,243,0.1);
  border-color: rgba(250,248,243,0.2);
  color: var(--paper);
}
.trend-card.accent .tag.highlight {
  background: var(--amber-500);
  border-color: var(--amber-500);
  color: var(--ink-900);
}

.trend-index {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--amber-600);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.trend-title {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-900);
  line-height: 1.35;
  margin-bottom: 10px;
}

.trend-conclusion {
  font-size: 13px;
  color: var(--ink-600);
  line-height: 1.55;
  margin-bottom: 14px;
}

.trend-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.tag {
  display: inline-block;
  padding: 4px 10px;
  font-size: 11.5px;
  font-weight: 500;
  background: var(--ink-50);
  border: 1px solid var(--ink-200);
  border-radius: 2px;
  color: var(--ink-700);
}

.tag.highlight {
  background: var(--amber-50);
  border-color: var(--amber-400);
  color: var(--amber-600);
  font-weight: 600;
}

.tag.danger {
  background: var(--rose-100);
  border-color: var(--rose-500);
  color: var(--rose-600);
  font-weight: 600;
}

.trend-source {
  font-size: 10.5px;
  color: var(--ink-400);
  font-family: var(--font-mono);
  padding-top: 10px;
  border-top: 1px dashed var(--ink-100);
}

/* ============================================================
   图表卡片
   ============================================================ */
.chart-row {
  display: grid;
  gap: 16px;
  margin-bottom: 16px;
}

.chart-row.two-col {
  grid-template-columns: 1fr 1.2fr;
}

.chart-row.three-col {
  grid-template-columns: 1fr 1fr 1fr;
}

.chart-grid {
  display: grid;
  gap: 16px;
}

.enterprise-grid {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
}

.chart-card {
  background: var(--paper);
  border: 1px solid var(--ink-200);
  border-radius: 2px;
  padding: 18px 20px 14px;
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 6px;
  gap: 12px;
}

.chart-title {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-900);
}

.chart-source {
  font-size: 10.5px;
  color: var(--ink-400);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.chart-container {
  width: 100%;
  min-height: 280px;
}

.chart-note {
  font-size: 11px;
  color: var(--ink-400);
  padding-top: 8px;
  border-top: 1px solid var(--ink-100);
  font-family: var(--font-mono);
  margin-top: 6px;
}

/* 统计条 */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--ink-200);
  border: 1px solid var(--ink-200);
  border-radius: 2px;
  overflow: hidden;
}

.stat-item {
  background: var(--paper-2);
  padding: 16px 20px;
  text-align: center;
}

.stat-value {
  display: block;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-900);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 12px;
  color: var(--ink-500);
}

/* 洞察横幅 */
.insight-banner {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 18px 22px;
  background: var(--amber-50);
  border-left: 4px solid var(--amber-600);
  border-radius: 2px;
  margin-top: 16px;
}

.insight-tag {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
  color: var(--amber-600);
  text-transform: uppercase;
  letter-spacing: 1px;
  padding-top: 2px;
}

.insight-banner p {
  font-size: 13px;
  color: var(--ink-700);
  line-height: 1.65;
}

/* ============================================================
   市场说明区
   ============================================================ */
.market-notes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 24px;
  padding: 16px 20px;
  background: var(--paper-2);
  border: 1px solid var(--ink-200);
  border-radius: 2px;
}

.note-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 12.5px;
  color: var(--ink-600);
  line-height: 1.6;
}

.note-item strong {
  color: var(--ink-800);
  font-weight: 600;
}

.note-dot {
  flex-shrink: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-top: 5px;
}

.dot-1 { background: var(--indigo-600); }
.dot-2 { background: var(--teal-600); }
.dot-3 { background: var(--amber-600); }
.dot-4 { background: var(--violet-600); }

/* ============================================================
   风险区
   ============================================================ */
.risk-section .section-header {
  border-bottom-color: var(--rose-600);
}

.risk-title { color: var(--ink-900); }
.risk-num { color: var(--rose-600) !important; }

.risk-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.risk-card {
  background: var(--paper-2);
  border: 1px solid var(--ink-200);
  border-radius: 2px;
  padding: 20px;
  position: relative;
  overflow: hidden;
}

.risk-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--rose-500);
}

.risk-icon {
  width: 36px;
  height: 36px;
  color: var(--rose-600);
  margin-bottom: 12px;
}

.risk-icon svg {
  width: 100%;
  height: 100%;
}

.risk-card h4 {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-900);
  margin-bottom: 8px;
}

.risk-card p {
  font-size: 12.5px;
  color: var(--ink-600);
  line-height: 1.65;
  margin-bottom: 10px;
}

.risk-source {
  font-size: 10.5px;
  color: var(--ink-400);
  font-family: var(--font-mono);
  padding-top: 8px;
  border-top: 1px dashed var(--ink-200);
  display: block;
}

/* ============================================================
   页脚
   ============================================================ */
.dashboard-footer {
  margin-top: 60px;
  padding-top: 32px;
  border-top: 2px solid var(--ink-900);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1.2fr 1.2fr;
  gap: 32px;
  margin-bottom: 28px;
}

.footer-col h4 {
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-900);
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}

.footer-col p {
  font-size: 12px;
  color: var(--ink-500);
  line-height: 1.7;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--ink-200);
  font-size: 11px;
  color: var(--ink-400);
  font-family: var(--font-mono);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1200px) {
  .kpi-strip { grid-template-columns: repeat(3, 1fr); }
  .trend-grid { grid-template-columns: repeat(2, 1fr); }
  .chart-row.two-col { grid-template-columns: 1fr; }
  .chart-row.three-col { grid-template-columns: 1fr 1fr; }
  .enterprise-grid { grid-template-columns: 1fr; }
  .risk-grid { grid-template-columns: 1fr 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .dashboard { padding: 20px 16px 32px; }
  .header-inner { padding: 14px 16px 10px; flex-wrap: wrap; }
  .nav-inner { padding: 0 12px; }
  .brand-text h1 { font-size: 18px; }
  .subtitle { font-size: 10px; }
  .section-title { font-size: 19px; }
  .section-desc { font-size: 12px; }

  .kpi-strip { grid-template-columns: 1fr 1fr; }
  .kpi-value { font-size: 26px; }
  .kpi-card { padding: 16px 14px; }

  .trend-grid { grid-template-columns: 1fr; }
  .chart-row.three-col { grid-template-columns: 1fr; }
  .stats-strip { grid-template-columns: 1fr 1fr; }
  .risk-grid { grid-template-columns: 1fr; }
  .market-notes { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 20px; }
  .footer-bottom { flex-direction: column; gap: 6px; }

  .chart-container { min-height: 260px; }
  .insight-banner { flex-direction: column; gap: 8px; }
}