/* Shared article styles. Tokens align with iOS app Theme.swift
   (kd-ttc:TTCApp/Theme/Theme.swift). See openspec/specs/seo-aeo/spec.md
   "共享 CSS 與 iOS app 配色一致" for the token-mapping contract. */
:root{
  /* Brand tokens — 1:1 with Theme.swift */
  --qt-background:#FBF8F4;
  --qt-card-background:#FFFFFF;
  --qt-card-border:#E8E2D6;
  --qt-accent:#3F8B86;
  --qt-text-primary:#1F2A24;
  --qt-text-secondary:#5C6660;
  --qt-text-tertiary:#9AA39E;
  --qt-source-law:#2563EB;
  --qt-source-ruling:#9A6209;
  --qt-source-court:#7C3AED;
  /* Auxiliary derived neutrals (spec §衍生中性色) */
  --qt-surface-elev:#FDFAF2;
  --qt-paper-deep:#F4ECDA;
  --qt-rule-soft:#ECE4D2;
  --qt-rule-strong:var(--qt-card-border);
  /* Typography */
  --serif:'Noto Serif TC','Songti TC','STSong',serif;
  --sans:'IBM Plex Sans TC','PingFang TC','Noto Sans TC',system-ui,sans-serif;
  --mono:'IBM Plex Mono','SF Mono',Monaco,monospace;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--serif);background:var(--qt-background);color:var(--qt-text-primary);font-size:18px;line-height:1.85;font-feature-settings:"palt" 1;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:1;opacity:.045;background-image:url("data:image/svg+xml;utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.7'/%3E%3C/svg%3E");mix-blend-mode:multiply}
a{color:var(--qt-accent);text-decoration:none;transition:color .15s ease}
a:hover{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}

.reading-progress{position:fixed;top:0;left:0;height:2px;width:0;background:var(--qt-accent);z-index:200;transition:width .08s ease-out}

.nav{position:sticky;top:0;z-index:50;background:rgba(251,248,244,.92);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--qt-card-border)}
.nav-inner{max-width:880px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:12px;font-family:var(--serif);font-weight:700;font-size:18px;color:var(--qt-text-primary);letter-spacing:.01em}
.logo-mark{width:32px;height:32px;border-radius:3px;background:var(--qt-accent);display:grid;place-items:center;color:var(--qt-background);font-family:var(--serif);font-weight:700;font-size:16px;box-shadow:0 1px 0 rgba(0,0,0,.08), inset 0 0 0 1px rgba(255,255,255,.12)}
.nav-cta{display:inline-flex;align-items:center;gap:6px;background:var(--qt-text-primary);color:var(--qt-background);padding:10px 20px;border-radius:2px;font-family:var(--sans);font-size:13px;font-weight:500;letter-spacing:.08em;transition:background .15s ease}
.nav-cta:hover{background:var(--qt-accent);color:var(--qt-background);text-decoration:none}
.nav-link{color:var(--qt-text-secondary);font-family:var(--sans);font-size:13px;font-weight:500;letter-spacing:.05em;margin-right:18px}
.nav-link:hover{color:var(--qt-accent);text-decoration:none}
.nav-right{display:flex;align-items:center;gap:0}

.article-wrap{max-width:720px;margin:0 auto;padding:0 24px;position:relative;z-index:2}
.breadcrumb{font-family:var(--sans);font-size:11px;color:var(--qt-text-tertiary);margin:40px 0 0;display:flex;gap:0;flex-wrap:wrap;text-transform:uppercase;letter-spacing:.18em}
.breadcrumb a{color:var(--qt-text-secondary)}
.breadcrumb a:hover{color:var(--qt-accent);text-decoration:none}
.breadcrumb-sep{color:var(--qt-text-tertiary);margin:0 10px}

article h1{font-family:var(--serif);font-weight:900;font-size:clamp(30px,5vw,46px);line-height:1.25;margin:20px 0 24px;color:var(--qt-text-primary);letter-spacing:-.01em}
article .meta{font-family:var(--sans);color:var(--qt-text-tertiary);font-size:13px;margin:0 0 48px;letter-spacing:.06em;display:flex;gap:14px;flex-wrap:wrap;align-items:center;padding-bottom:28px;border-bottom:1px solid var(--qt-card-border)}
article .meta time{font-variant-numeric:tabular-nums}
article h2{font-family:var(--sans);font-weight:700;font-size:clamp(20px,2.6vw,26px);line-height:1.4;margin:72px 0 24px;color:var(--qt-text-primary);letter-spacing:-.005em;position:relative;padding-top:32px}
article h2::before{content:"";position:absolute;top:0;left:0;width:40px;height:2px;background:var(--qt-accent)}
article h3{font-family:var(--sans);font-weight:600;font-size:18px;margin:36px 0 14px;color:var(--qt-text-primary)}
article p{margin:0 0 18px;font-feature-settings:"palt" 1}
article ul,article ol{margin:0 0 22px;padding-left:24px}
article li{margin-bottom:8px}
article li::marker{color:var(--qt-source-ruling)}
article strong{color:var(--qt-text-primary);font-weight:700}
article code{background:var(--qt-paper-deep);padding:1px 7px;border-radius:2px;font-size:14px;color:var(--qt-accent);font-family:var(--mono);border:1px solid var(--qt-rule-soft)}

.tldr{position:relative;background:var(--qt-card-background);border:1px solid var(--qt-card-border);padding:32px 40px 32px 44px;margin:32px 0;border-radius:1px;box-shadow:0 1px 0 rgba(154,98,9,.06)}
.tldr::before{content:"";position:absolute;top:0;left:0;width:5px;height:100%;background:var(--qt-accent)}
.tldr-label{font-family:var(--sans);font-size:11px;font-weight:700;color:var(--qt-accent);letter-spacing:.28em;margin-bottom:14px;text-transform:uppercase;display:flex;align-items:center;gap:12px}
.tldr-label::after{content:"";flex:1;height:1px;background:var(--qt-rule-strong);max-width:60px}
.tldr p{font-family:var(--serif);font-size:17px;line-height:1.9;color:var(--qt-text-primary);margin:0}
.tldr p strong{color:var(--qt-accent);font-weight:700}

.callout-warn{background:var(--qt-paper-deep);border:1px solid var(--qt-card-border);border-left:3px solid var(--qt-source-ruling);padding:14px 20px;margin:0 0 40px;font-family:var(--sans);font-size:14px;line-height:1.7;color:var(--qt-text-secondary);border-radius:1px}
.callout-warn strong{color:var(--qt-source-ruling);font-weight:700}

.answer-block{background:var(--qt-card-background);border:1px solid var(--qt-rule-soft);border-top:2px solid var(--qt-accent);padding:24px 28px;margin:0 0 32px;border-radius:1px}
.answer-block p{margin:0;font-size:17px;line-height:1.85;color:var(--qt-text-primary)}
.answer-block strong{color:var(--qt-text-primary)}

.compare-table{width:100%;border-collapse:collapse;margin:32px 0;font-family:var(--sans);font-size:14px;background:var(--qt-card-background);border:1px solid var(--qt-card-border);border-radius:1px}
.compare-table th{background:var(--qt-paper-deep);color:var(--qt-text-primary);font-weight:600;text-align:left;padding:14px 18px;border-bottom:1px solid var(--qt-card-border);font-size:12px;letter-spacing:.1em;text-transform:uppercase}
.compare-table td{padding:14px 18px;border-bottom:1px solid var(--qt-rule-soft);vertical-align:top;line-height:1.6}
.compare-table tr:last-child td{border-bottom:0}
.compare-table tr:hover td{background:var(--qt-surface-elev)}
.compare-table .num{font-variant-numeric:tabular-nums;white-space:nowrap;font-family:var(--mono);font-size:13px;color:var(--qt-text-secondary)}
.compare-table strong{color:var(--qt-text-primary)}

.cite{display:inline-block;font-family:var(--sans);font-size:12px;font-weight:600;color:var(--qt-source-ruling);background:transparent;padding:1px 6px;border:1px solid var(--qt-source-ruling);border-radius:1px;font-variant-numeric:tabular-nums;margin:0 2px;letter-spacing:.04em;vertical-align:1px;transition:all .15s ease}
.cite:hover{background:var(--qt-source-ruling);color:var(--qt-background);text-decoration:none}

/* Source-type chips (spec §Source-type 三色用途). Phase 4 articles SHOULD prefer
   these granular classes over the legacy `.cite` shortcut. */
.src-law{color:var(--qt-source-law);border-color:var(--qt-source-law)}
.src-law:hover{background:var(--qt-source-law);color:var(--qt-background)}
.src-ruling{color:var(--qt-source-ruling);border-color:var(--qt-source-ruling)}
.src-ruling:hover{background:var(--qt-source-ruling);color:var(--qt-background)}
.src-court{color:var(--qt-source-court);border-color:var(--qt-source-court)}
.src-court:hover{background:var(--qt-source-court);color:var(--qt-background)}
.src-law,.src-ruling,.src-court{display:inline-block;font-family:var(--sans);font-size:12px;font-weight:600;background:transparent;padding:1px 6px;border:1px solid;border-radius:1px;font-variant-numeric:tabular-nums;margin:0 2px;letter-spacing:.04em;vertical-align:1px;transition:all .15s ease}

aside.related{background:var(--qt-card-background);border:1px solid var(--qt-card-border);padding:28px 32px;margin:56px 0 32px;border-radius:1px;position:relative}
aside.related::before{content:"§";position:absolute;top:-12px;left:24px;background:var(--qt-background);color:var(--qt-source-ruling);font-family:var(--serif);font-size:24px;padding:0 8px;line-height:1}
aside.related h3{margin:0 0 18px;font-family:var(--sans);font-size:11px;color:var(--qt-text-tertiary);font-weight:600;text-transform:uppercase;letter-spacing:.2em}
aside.related ul{padding-left:0;margin:0;list-style:none}
aside.related li{margin-bottom:10px;padding-left:20px;position:relative;font-size:15px;font-family:var(--serif)}
aside.related li::before{content:"→";position:absolute;left:0;top:0;color:var(--qt-source-ruling);font-family:var(--sans)}
.aside-note{font-family:var(--sans);font-size:12px;color:var(--qt-text-tertiary);margin:18px 0 0;padding-top:14px;border-top:1px dashed var(--qt-card-border);font-style:italic;line-height:1.7}
.aside-note strong{color:var(--qt-text-secondary);font-style:normal}

.fp-data{background:var(--qt-surface-elev);border:1px solid var(--qt-card-border);border-top:3px solid var(--qt-source-ruling);padding:24px 28px;margin:32px 0;font-family:var(--sans);font-size:14px;line-height:1.75;border-radius:1px}
.fp-data-label{display:inline-block;font-family:var(--sans);font-size:10px;font-weight:700;color:var(--qt-source-ruling);letter-spacing:.28em;margin-bottom:12px;text-transform:uppercase}
.fp-data ul{margin:0;padding-left:18px;list-style:none}
.fp-data li{margin-bottom:6px;padding-left:14px;position:relative}
.fp-data li::before{content:"·";position:absolute;left:0;color:var(--qt-source-ruling);font-weight:700}
.fp-data strong{color:var(--qt-text-primary);font-weight:700}
.fp-data code{background:var(--qt-background);border:1px solid var(--qt-rule-soft);padding:1px 5px;font-size:12px}
.fp-source{font-family:var(--sans);font-size:12px;color:var(--qt-text-tertiary);margin:14px 0 0;padding-top:14px;border-top:1px solid var(--qt-rule-soft);font-style:italic}
.fp-source code{font-style:normal}

.cta-block{background:var(--qt-text-primary);color:var(--qt-background);padding:36px 40px;margin:48px 0;border-radius:1px;position:relative;overflow:hidden}
.cta-block::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--qt-source-court) 0%,var(--qt-source-ruling) 50%,var(--qt-source-law) 100%)}
.cta-block h3{font-family:var(--serif);color:var(--qt-background);margin:0 0 12px;font-size:24px;font-weight:700;letter-spacing:.01em}
.cta-block p{margin:0 0 24px;opacity:.85;font-size:15px;line-height:1.75;font-family:var(--serif)}
.cta-block p a{color:var(--qt-source-ruling);border-bottom:1px solid var(--qt-source-ruling);text-decoration:none}
.cta-block p a:hover{color:var(--qt-background);border-color:var(--qt-background)}
.cta-btn{display:inline-flex;align-items:center;gap:8px;background:var(--qt-background);color:var(--qt-text-primary);padding:14px 24px;border-radius:1px;font-family:var(--sans);font-weight:600;font-size:14px;letter-spacing:.06em;transition:transform .12s ease, background .15s ease}
.cta-btn:hover{background:var(--qt-source-ruling);color:var(--qt-background);text-decoration:none;transform:translateX(2px)}

.article-footer{margin-top:80px;padding:32px 0 64px;border-top:1px solid var(--qt-card-border);font-family:var(--sans);font-size:13px;color:var(--qt-text-tertiary)}
.disclaimer{background:transparent;border:1px dashed var(--qt-rule-strong);color:var(--qt-text-secondary);padding:16px 20px;margin-bottom:20px;font-size:13px;line-height:1.7;border-radius:1px;font-family:var(--sans)}
.disclaimer strong{color:var(--qt-accent);font-weight:700}
.update-time{font-variant-numeric:tabular-nums;font-style:italic}

.flow{display:flex;flex-direction:column;gap:14px;margin:32px 0;font-family:var(--sans);font-size:14px;counter-reset:step}
.flow-step{background:var(--qt-card-background);border:1px solid var(--qt-rule-soft);padding:14px 20px 14px 56px;position:relative;border-radius:1px;counter-increment:step}
.flow-step::before{content:counter(step,decimal-leading-zero);position:absolute;left:18px;top:50%;transform:translateY(-50%);font-family:var(--mono);font-size:12px;color:var(--qt-source-ruling);letter-spacing:.05em}
.flow-step::after{content:"";position:absolute;left:24px;bottom:-15px;width:1px;height:14px;background:var(--qt-rule-strong)}
.flow-step:last-child::after{display:none}
.flow-step strong{color:var(--qt-accent)}

/* Use-case scenario boxes (chuangye / jizhangshi / kuaijishi articles) */
.scenario{background:var(--qt-card-background);border:1px solid var(--qt-rule-soft);padding:0;margin:0 0 28px;border-radius:1px;overflow:hidden}
.scenario-header{background:var(--qt-paper-deep);padding:14px 22px;border-bottom:1px solid var(--qt-rule-soft);font-family:var(--sans);font-size:12px;color:var(--qt-text-secondary);letter-spacing:.08em}
.scenario-header strong{color:var(--qt-accent);font-weight:700;letter-spacing:.05em}
.scenario-body{padding:18px 22px;font-family:var(--sans);font-size:14px;line-height:1.75;color:var(--qt-text-secondary)}
.scenario-body strong{color:var(--qt-text-primary)}
.scenario-query{background:var(--qt-text-primary);color:var(--qt-background);padding:10px 14px;margin:10px 0;border-radius:1px;font-family:var(--mono);font-size:13px;line-height:1.5;border-left:3px solid var(--qt-source-ruling)}
.scenario-query::before{content:"❯ ";color:var(--qt-source-ruling)}

/* Article list page (articles/index.html). Activated by adding
   `class="article-list-page"` on the <body> element. */
body.article-list-page{font-size:17px;line-height:1.75}
.wrap{max-width:880px;margin:0 auto;padding:64px 24px;position:relative;z-index:2}
.page-eyebrow{font-family:var(--sans);font-size:11px;color:var(--qt-accent);letter-spacing:.28em;text-transform:uppercase;margin-bottom:16px;display:flex;align-items:center;gap:14px}
.page-eyebrow::after{content:"";flex:1;height:1px;background:var(--qt-rule-strong);max-width:120px}
.page-header{margin-bottom:64px;border-bottom:1px solid var(--qt-card-border);padding-bottom:40px}
.page-header h1{font-family:var(--serif);font-size:clamp(36px,5.5vw,52px);font-weight:900;letter-spacing:-.01em;line-height:1.2;margin:0 0 16px;color:var(--qt-text-primary)}
.page-header p{font-family:var(--serif);color:var(--qt-text-secondary);font-size:18px;margin:0;line-height:1.8;max-width:620px}
.article-list{display:grid;gap:0}
.article-card{display:block;background:transparent;border:0;border-bottom:1px solid var(--qt-rule-soft);padding:28px 0;transition:padding .15s ease}
.article-card:first-child{padding-top:0}
.article-card:last-child{border-bottom:0}
a.article-card:hover{text-decoration:none;padding-left:8px}
.article-card h2{font-family:var(--serif);margin:0 0 10px;font-size:24px;font-weight:700;color:var(--qt-text-primary);line-height:1.4;transition:color .15s ease}
a.article-card:hover h2{color:var(--qt-accent)}
.article-card .summary{font-family:var(--serif);color:var(--qt-text-secondary);font-size:16px;margin:0 0 14px;line-height:1.75;max-width:680px}
.article-card .meta{font-family:var(--sans);font-size:12px;color:var(--qt-text-tertiary);display:flex;gap:10px;flex-wrap:wrap;letter-spacing:.06em;font-variant-numeric:tabular-nums}
.tag{display:inline-block;font-family:var(--sans);font-size:10px;background:transparent;color:var(--qt-accent);padding:2px 8px;border:1px solid var(--qt-accent);border-radius:1px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;margin-left:12px;vertical-align:3px}

@media (max-width:640px){
  body{font-size:17px}
  .nav-inner{height:56px;padding:0 18px}
  .nav-link{margin-right:12px;font-size:12px}
  .article-wrap{padding:0 18px}
  .tldr{padding:24px 24px 24px 28px}
  .tldr p{font-size:16px}
  .answer-block{padding:18px 22px}
  .answer-block p{font-size:16px}
  .cta-block{padding:28px 24px}
  .cta-block h3{font-size:20px}
  .compare-table{font-size:13px}
  .compare-table th,.compare-table td{padding:10px 12px}
  aside.related{padding:24px 22px}
  .wrap{padding:40px 18px}
  .page-header{margin-bottom:40px;padding-bottom:32px}
  .article-card{padding:22px 0}
  .article-card h2{font-size:20px}
  .scenario-query{font-size:12px}
  .tag{margin:6px 0 0;vertical-align:baseline}
}