/* ===== 清爽调研报告风格 v3.2.0 — 完整CSS系统 ===== */

/* ---- 1. Design Tokens (css-system.md) ---- */
:root {
  --color-success:#059669;--color-success-light:#10B981;--color-success-dark:#047857;--color-success-50:#ECFDF5;
  --color-danger:#E11D48;--color-danger-light:#F43F5E;
  --color-warning:#D97706;--color-warning-light:#F59E0B;--color-warning-50:#FFFBEB;
  --color-info:#2563EB;--color-info-light:#3B82F6;--color-info-50:#EFF6FF;
  --color-purple:#7C3AED;--color-purple-light:#8B5CF6;--color-purple-50:#F5F3FF;
  --color-text-primary:#1C1917;--color-text-secondary:#57534E;--color-text-muted:#78716C;
  --color-border:#E7E5E4;--color-border-light:#F5F5F4;
  --color-bg:#F8FAFB;--color-bg-card:#FFFFFF;--color-bg-table-header:#FAFAF9;
  --gradient-success:linear-gradient(135deg,#059669 0%,#10B981 100%);
  --gradient-hero:linear-gradient(135deg,#059669 0%,#2563EB 50%,#7C3AED 100%);
  --gradient-mesh:radial-gradient(at 20% 20%,rgba(5,150,105,.08) 0%,transparent 50%),radial-gradient(at 80% 80%,rgba(37,99,235,.06) 0%,transparent 50%),radial-gradient(at 50% 50%,rgba(124,58,237,.04) 0%,transparent 50%);
  --shadow-xs:0 1px 2px rgba(0,0,0,.04);
  --shadow-card:0 2px 8px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);
  --shadow-md:0 4px 6px -1px rgba(0,0,0,.07),0 2px 4px -2px rgba(0,0,0,.04);
  --shadow-glow-success:0 4px 14px rgba(5,150,105,.15);
  --shadow-hover:0 6px 16px rgba(5,150,105,.15),0 2px 6px rgba(5,150,105,.1);
  --spacing-xs:4px;--spacing-sm:8px;--spacing-md:16px;--spacing-lg:24px;--spacing-xl:32px;--spacing-2xl:40px;
  --radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-full:9999px;
  --font-family:-apple-system,"SF Pro Display",system-ui,sans-serif;
  --transition-fast:150ms cubic-bezier(.4,0,.2,1);
  --transition-normal:200ms cubic-bezier(.4,0,.2,1);
  --content-max-width:980px;
}

/* ---- 2. Reset & Base ---- */
*,*::before,*::after{box-sizing:border-box}
body{margin:0;font-family:var(--font-family);font-size:15px;line-height:1.65;color:var(--color-text-secondary);background:var(--color-bg);background-image:var(--gradient-mesh);background-attachment:fixed;min-height:100dvh}
a{color:var(--color-info);text-decoration:none}
a:hover{text-decoration:underline}

/* ---- 3. Container ---- */
.container{max-width:var(--content-max-width);margin:0 auto;padding:var(--spacing-lg) 20px var(--spacing-2xl)}
.container.mobile-preview{max-width:375px;box-shadow:0 0 0 8px var(--color-text-primary),0 0 40px rgba(0,0,0,.15);border-radius:32px;margin-top:20px}

/* ---- 4. Header / Hero ---- */
.header{text-align:center;padding:var(--spacing-2xl) 0 var(--spacing-xl);position:relative}
.header::after{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--gradient-hero)}
.header-title{font-size:clamp(24px,4vw,34px);font-weight:800;margin:0 0 var(--spacing-sm);background:var(--gradient-hero);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-wrap:balance;line-height:1.2}
.header-subtitle{font-size:16px;color:var(--color-text-muted);font-weight:500;margin:0 0 var(--spacing-md)}
.meta-row{display:flex;flex-wrap:wrap;justify-content:center;gap:var(--spacing-sm) var(--spacing-md);font-size:13px;color:var(--color-text-muted)}
.meta-row span{background:var(--color-bg-card);padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--radius-full);border:1px solid var(--color-border)}

/* ---- 5. Tab Navigation (Glassmorphism) ---- */
.tab-nav{display:flex;gap:4px;background:rgba(255,255,255,.85);backdrop-filter:blur(20px) saturate(1.8);-webkit-backdrop-filter:blur(20px) saturate(1.8);border:1px solid rgba(255,255,255,.7);border-radius:var(--radius-lg);padding:5px;position:sticky;top:12px;z-index:100;overflow-x:auto;scrollbar-width:none;margin-bottom:var(--spacing-lg)}
.tab-nav::-webkit-scrollbar{display:none}
.tab-btn{flex-shrink:0;display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border-radius:var(--radius-md);font-size:13px;font-weight:600;cursor:pointer;transition:all var(--transition-normal);white-space:nowrap;border:none;background:transparent;color:var(--color-text-muted);touch-action:manipulation}
.tab-btn:hover{background:rgba(5,150,105,.06);color:var(--color-success)}
.tab-btn.active{background:var(--gradient-success);color:#fff;box-shadow:var(--shadow-glow-success)}
.tab-icon{width:16px;height:16px;flex-shrink:0;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.tab-btn.active .tab-icon{stroke:#fff}

/* ---- 6. Section Overview (SVG Diagram) ---- */
.section-overview{background:linear-gradient(135deg,#F8FAF9 0%,#F3F7F5 100%);border:1px solid var(--color-border-light);border-radius:var(--radius-lg);padding:var(--spacing-lg);margin-bottom:var(--spacing-lg);position:relative}
.section-overview-label{position:absolute;top:12px;left:12px;padding:4px 10px;background:rgba(5,150,105,.1);color:var(--color-success);border-radius:var(--radius-full);font-size:11px;font-weight:600}
.section-overview-content{display:flex;justify-content:center;align-items:center;min-height:100px;overflow-x:auto}
.section-overview-content svg{max-width:100%;height:auto}
.section-overview-caption{text-align:center;font-size:12px;color:var(--color-text-muted);margin-top:var(--spacing-sm);font-style:italic}

/* ---- 7. Panel ---- */
.panel{display:none;animation:fadeIn .3s cubic-bezier(.4,0,.2,1)}
.panel.active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ---- 8. Section Card ---- */
.section{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-card);margin-bottom:var(--spacing-lg)}
.section h2{font-size:20px;font-weight:700;color:var(--color-text-primary);margin:0 0 var(--spacing-md);line-height:1.3;text-wrap:balance}
.section h3{font-size:16px;font-weight:700;color:var(--color-text-primary);margin:20px 0 10px;line-height:1.4}
.section p{max-width:65ch;line-height:1.7}

/* ---- 9. Stats Grid ---- */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:var(--spacing-md);margin:var(--spacing-md) 0}
.stat-card{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:20px;text-align:center;transition:all var(--transition-normal)}
.stat-card:hover{box-shadow:var(--shadow-md);transform:translateY(-3px)}
.stat-value{font-size:28px;font-weight:700;font-variant-numeric:tabular-nums}
.stat-value.green{color:var(--color-success)}.stat-value.blue{color:var(--color-info)}.stat-value.purple{color:var(--color-purple)}.stat-value.amber{color:var(--color-warning)}
.stat-label{font-size:12px;color:var(--color-text-muted);margin-top:var(--spacing-xs)}

/* ---- 10. Table ---- */
table{width:100%;border-collapse:collapse;margin:var(--spacing-md) 0;font-size:14px;background:var(--color-bg-card);border-radius:var(--radius-md);overflow:hidden;font-variant-numeric:tabular-nums}
caption{text-align:left;font-size:13px;font-weight:600;color:var(--color-text-muted);padding:var(--spacing-sm) 0;caption-side:top}
th,td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--color-border-light)}
th{background:var(--color-bg-table-header);font-weight:600;font-size:13px;color:var(--color-text-muted)}
tr:hover td{background:rgba(5,150,105,.02)}
.hl-row{background:rgba(5,150,105,.04)}
.ck{color:var(--color-success);font-weight:700}.cx{color:var(--color-danger)}
.highlight-col{background:rgba(5,150,105,.08)!important}

/* ---- 11. Insight Box (Five Colors) ---- */
.insight-box{border-radius:var(--radius-md);padding:var(--spacing-md) 20px;margin:14px 0;border-left:4px solid var(--color-info);background:var(--color-info-50)}
.insight-title{display:block;margin-bottom:6px;font-size:14px;font-weight:600;color:var(--color-info)}
.insight-box.green{border-color:var(--color-success);background:var(--color-success-50)}.insight-box.green .insight-title{color:var(--color-success)}
.insight-box.amber{border-color:var(--color-warning);background:var(--color-warning-50)}.insight-box.amber .insight-title{color:var(--color-warning)}
.insight-box.red{border-color:var(--color-danger);background:rgba(225,29,72,.05)}.insight-box.red .insight-title{color:var(--color-danger)}
.insight-box.purple{border-color:var(--color-purple);background:var(--color-purple-50)}.insight-box.purple .insight-title{color:var(--color-purple)}

/* ---- 12. Quote ---- */
.quote{background:var(--color-bg-table-header);border-left:3px solid var(--color-purple);border-radius:0 var(--radius-md) var(--radius-md) 0;padding:var(--spacing-md) 20px;margin:var(--spacing-md) 0;font-style:italic;color:var(--color-text-primary);line-height:1.8}

/* ---- 13. Timeline ---- */
.timeline{position:relative;padding-left:28px;margin:var(--spacing-md) 0}
.timeline::before{content:'';position:absolute;left:8px;top:0;bottom:0;width:3px;background:var(--gradient-hero);border-radius:2px}
.tl-item{position:relative;margin-bottom:18px}
.tl-item::before{content:'';position:absolute;left:-24px;top:6px;width:12px;height:12px;border-radius:50%;background:var(--color-success);border:2.5px solid #fff;box-shadow:0 0 0 2px var(--color-success)}
.tl-year{font-weight:700;font-size:14px;color:var(--color-success)}
.tl-desc{font-size:14px;color:var(--color-text-secondary);margin-top:var(--spacing-xs);max-width:65ch}

/* ---- 14. Tags ---- */
.tag{display:inline-flex;padding:2px 8px;border-radius:var(--radius-full);font-size:12px;font-weight:500}
.tag-green{background:rgba(5,150,105,.12);color:var(--color-success)}
.tag-red{background:rgba(225,29,72,.12);color:var(--color-danger)}
.tag-amber{background:rgba(217,119,6,.12);color:var(--color-warning)}

/* ---- 15. Learn More Footer ---- */
.learn-more{margin-top:var(--spacing-xl);background:linear-gradient(135deg,#F8FAFB 0%,#EEF2F6 100%);border:1px solid var(--color-border-light);border-radius:var(--radius-lg);padding:var(--spacing-lg);box-shadow:var(--shadow-card)}
.learn-more-title{font-size:16px;font-weight:700;color:var(--color-text-primary);margin:0 0 var(--spacing-sm);display:flex;align-items:center;gap:var(--spacing-sm)}
.learn-more p{font-size:14px;color:var(--color-text-secondary);line-height:1.7;margin:0 0 var(--spacing-md);max-width:65ch}
.btn-home{display:inline-flex;align-items:center;gap:6px;padding:var(--spacing-sm) var(--spacing-md);background:var(--gradient-success);color:#fff;border-radius:var(--radius-full);font-size:13px;font-weight:600;text-decoration:none;transition:all var(--transition-normal);touch-action:manipulation}
.btn-home:hover{box-shadow:var(--shadow-glow-success);transform:translateY(-1px);text-decoration:none}
.refs{border-top:1px solid var(--color-border);padding-top:var(--spacing-md);margin-top:var(--spacing-md)}
.refs-title{font-size:13px;font-weight:600;color:var(--color-text-primary);margin:0 0 var(--spacing-sm)}
.refs ul{list-style:none;padding:0;margin:0;font-size:13px}
.refs li{margin-bottom:6px}

/* ---- 16. References Section ---- */
.ref-list{columns:1;gap:var(--spacing-lg)}
.ref-group{break-inside:avoid;margin-bottom:var(--spacing-lg)}
.ref-group h3{font-size:14px;font-weight:600;margin:0 0 var(--spacing-sm);color:var(--color-text-primary)}
.ref-group ol{padding-left:20px;margin:0;font-size:13px;line-height:1.8;color:var(--color-text-secondary)}

/* ---- 17. Controls ---- */
.controls{position:fixed;bottom:var(--spacing-lg);right:var(--spacing-lg);display:flex;flex-direction:column;gap:var(--spacing-sm);z-index:200}
.ctrl-btn{width:44px;height:44px;border-radius:50%;border:none;cursor:pointer;background:rgba(255,255,255,.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:var(--shadow-card);font-size:16px;display:grid;place-items:center;transition:all var(--transition-normal);color:var(--color-text-primary);touch-action:manipulation}
.ctrl-btn:hover{transform:scale(1.1);box-shadow:var(--shadow-hover)}

/* ---- 18. Focus Visible (A11y) ---- */
.tab-btn:focus-visible,.ctrl-btn:focus-visible,.btn-home:focus-visible,a:focus-visible{outline:2px solid var(--color-success);outline-offset:3px;box-shadow:0 0 0 5px rgba(5,150,105,.12)}
:focus:not(:focus-visible){outline:none}

/* ---- 19. Reduced Motion ---- */
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}

/* ---- 20. Responsive ---- */
@media(min-width:768px){.ref-list{columns:2}}
@media(max-width:768px){
  .container{padding:var(--spacing-md) var(--spacing-md) var(--spacing-xl)}
  .header{padding:var(--spacing-xl) 0 var(--spacing-lg)}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .tab-btn-text{display:none}
  .tab-btn{padding:10px 12px}
  .tab-nav{gap:2px;padding:4px}
  .section{padding:var(--spacing-md)}
  .section-overview{padding:var(--spacing-md)}
  .section-overview-content svg{transform:scale(.75);transform-origin:center}
  table{font-size:13px}
  th,td{padding:8px 10px}
}
@media(max-width:480px){
  .header-title{font-size:20px}
  .stat-value{font-size:22px}
  .section-overview-content svg{transform:scale(.6)}
}