/* AI 海淘指南 · 浅底信息卡 / 编辑部风 · mobile-first */

:root {
  --paper: oklch(97.5% 0.01 85);
  --card: oklch(99.5% 0.004 85);
  --ink: oklch(22% 0.02 60);
  --ink-soft: oklch(42% 0.02 60);
  --accent: oklch(60% 0.19 35);        /* 朱红 */
  --accent-soft: oklch(94% 0.04 35);
  --ok: oklch(55% 0.13 150);
  --line: oklch(88% 0.015 85);
  --text-base: clamp(1.0rem, 0.95rem + 0.4vw, 1.12rem);
  --text-h1: clamp(2.6rem, 1.6rem + 5vw, 5rem);
  --text-h2: clamp(1.5rem, 1.3rem + 1.2vw, 2.1rem);
  --space-section: clamp(3rem, 2rem + 4vw, 6rem);
  --radius: 14px;
  --shadow: 0 1px 2px oklch(0% 0 0 / .05), 0 8px 28px oklch(0% 0 0 / .07);
  --font: -apple-system, "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: var(--text-base);
  line-height: 1.85;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 80% -10%, var(--accent-soft), transparent 60%),
    var(--paper);
}

/* ---------- hero ---------- */
.hero { max-width: 880px; margin: 0 auto; padding: clamp(3rem, 8vw, 6.5rem) 1.4rem 2rem; }
.hero-brand {
  display: inline-block; font-weight: 700; font-size: .95rem; letter-spacing: .12em;
  color: var(--accent); border: 1.5px solid currentColor; border-radius: 999px;
  padding: .15em .9em; margin: 0 0 1.2rem;
}
.hero-title { font-size: var(--text-h1); line-height: 1.08; margin: 0; font-weight: 900; letter-spacing: .01em; }
.hero-title-accent { color: var(--accent); }
.hero-slogan { font-weight: 700; color: var(--ink-soft); letter-spacing: .25em; margin: .9rem 0 0; }
.hero-sub { color: var(--ink-soft); max-width: 34em; margin: 1.4rem 0 0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.hero-version { font-size: .82rem; color: var(--ink-soft); opacity: .75; margin-top: 2.2rem; }

.btn {
  display: inline-block; text-decoration: none; cursor: pointer;
  font: inherit; font-weight: 600; line-height: 1;
  padding: .85em 1.5em; border-radius: 999px; border: 1.5px solid transparent;
  transition: transform .15s cubic-bezier(.16,1,.3,1), box-shadow .15s;
}
.btn:active { transform: translateY(1px) scale(.99); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px oklch(60% .19 35 / .35); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink-soft); }

/* ---------- toc ---------- */
.toc { max-width: 880px; margin: 1rem auto 0; padding: 0 1.4rem; }
.toc ol { display: flex; flex-wrap: wrap; gap: .55rem; list-style: none; margin: 0; padding: 0; }
.toc a {
  display: inline-block; text-decoration: none; color: var(--ink-soft);
  font-size: .88rem; font-weight: 600;
  background: var(--card); border: 1px solid var(--line); border-radius: 999px;
  padding: .45em 1em; transition: color .15s, border-color .15s;
}
.toc a:hover, .toc a.active { color: var(--accent); border-color: var(--accent); }

/* ---------- 卡片通用 ---------- */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
}

/* ---------- 自测 ---------- */
.quiz { max-width: 880px; margin: var(--space-section) auto 0; padding: clamp(1.6rem, 4vw, 2.6rem); margin-left: auto; margin-right: auto; }
@media (max-width: 920px) { .quiz { margin-left: 1.4rem; margin-right: 1.4rem; } }
.quiz-heading { font-size: var(--text-h2); margin: 0; }
.quiz-sub { color: var(--ink-soft); margin: .4rem 0 1.4rem; }
.quiz-q { font-weight: 700; margin: 0 0 .9rem; }
.quiz-opts { display: grid; gap: .6rem; }
.quiz-opt {
  text-align: left; font: inherit; cursor: pointer;
  background: var(--paper); border: 1.5px solid var(--line); border-radius: 10px;
  padding: .8em 1.1em; transition: border-color .15s, background .15s;
}
.quiz-opt:hover { border-color: var(--accent); background: var(--accent-soft); }
.quiz-progress { font-size: .8rem; color: var(--ink-soft); margin-bottom: .6rem; letter-spacing: .1em; }
.quiz-result h3 { margin: 0 0 .6rem; font-size: 1.3rem; }
.quiz-result .badge { display: inline-block; background: var(--accent); color: #fff; border-radius: 6px; padding: .1em .6em; font-size: .85rem; font-weight: 700; margin-bottom: .8rem; }
.quiz-restart { margin-top: 1.2rem; }

/* ---------- 章节 ---------- */
main { max-width: 880px; margin: 0 auto; padding: 0 1.4rem; }
.chapter { margin-top: var(--space-section); }
.chapter-kicker { display: flex; align-items: baseline; gap: 1rem; }
.chapter-num {
  font-size: clamp(3rem, 2rem + 4vw, 4.6rem); font-weight: 900; line-height: 1;
  color: var(--accent); opacity: .28; letter-spacing: -.04em;
}
.chapter h2 { font-size: var(--text-h2); margin: 0; }
.chapter-lead { color: var(--ink-soft); font-size: 1.05em; margin: 1rem 0 0; max-width: 36em; }
.chapter .body { margin-top: 1.4rem; }
.chapter .body > p { max-width: 38em; }
.chapter strong { color: var(--accent); font-weight: 700; }

.box { padding: 1.2rem 1.4rem; margin: 1.2rem 0; }
.box-title { font-weight: 800; font-size: .92rem; letter-spacing: .08em; color: var(--ink-soft); margin: 0 0 .6rem; }
.box ul, .box ol { margin: 0; padding-left: 1.3em; }
.box li { margin: .35em 0; }
.box-warn { border-left: 4px solid var(--accent); }
.box-ok { border-left: 4px solid var(--ok); }

/* 自查清单 */
.checklist { list-style: none; padding: 0; margin: 0; display: grid; gap: .55rem; }
.checklist label {
  display: flex; gap: .7em; align-items: flex-start; cursor: pointer;
  background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: .75em 1em;
}
.checklist input { margin-top: .45em; accent-color: var(--accent); width: 1.05em; height: 1.05em; }
.checklist label:has(input:checked) { border-color: var(--ok); background: oklch(96% .03 150); }

/* 步骤 */
.steps { counter-reset: step; list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; }
.steps > li { counter-increment: step; padding: 1.1rem 1.3rem 1.1rem 3.4rem; position: relative; }
.steps > li::before {
  content: counter(step); position: absolute; left: 1.05rem; top: 1.05rem;
  width: 1.7em; height: 1.7em; border-radius: 50%;
  background: var(--accent); color: #fff; font-weight: 800;
  display: grid; place-items: center; font-size: .9rem;
}
.steps .step-title { font-weight: 800; margin: 0 0 .3rem; }
.steps .step-note { color: var(--ink-soft); font-size: .92em; margin: .4rem 0 0; }

/* 任务卡 */
.tasks { display: grid; gap: 1rem; margin: 1.2rem 0 0; }
@media (min-width: 720px) { .tasks { grid-template-columns: 1fr 1fr; } .tasks .task-wide { grid-column: 1 / -1; } }
.task { padding: 1.1rem 1.3rem; }
.task-tag { font-size: .78rem; font-weight: 800; color: var(--accent); letter-spacing: .1em; }
.task h4 { margin: .25rem 0 .4rem; font-size: 1.05rem; }
.task p { margin: 0; color: var(--ink-soft); font-size: .94em; }

/* FAQ */
.faq { display: grid; gap: .7rem; margin-top: 1.2rem; }
.faq details { padding: 0; overflow: hidden; }
.faq summary {
  cursor: pointer; font-weight: 700; padding: 1rem 1.3rem; list-style: none;
  display: flex; justify-content: space-between; gap: 1rem; align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "＋"; color: var(--accent); font-weight: 400; flex-shrink: 0; }
.faq details[open] summary::after { content: "－"; }
.faq .faq-a { padding: 0 1.3rem 1.1rem; color: var(--ink-soft); }
.faq .faq-a p { margin: 0 0 .6em; max-width: 40em; }

/* ---------- footer ---------- */
.footer { max-width: 880px; margin: var(--space-section) auto 0; padding: 0 1.4rem 4rem; }
.footer-vision { border-top: 2px solid var(--ink); padding-top: 2.2rem; }
.footer-vision p { font-size: clamp(1.15rem, 1rem + 1vw, 1.5rem); font-weight: 700; line-height: 1.7; margin: 0; }
.footer-find { margin-top: 1.6rem; color: var(--ink-soft); }
.footer-brand { font-weight: 800; letter-spacing: .18em; color: var(--accent); margin: 0 0 .3rem; }
.footer-actions { margin-top: 1.6rem; }
.footer-fine { font-size: .8rem; color: var(--ink-soft); opacity: .8; margin-top: 2rem; max-width: 44em; }

/* ---------- print（导出 PDF）---------- */
@page { size: A4; margin: 13mm 13mm 16mm; }
@media print {
  :root { --paper: #fff; --card: #fff; }
  * { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  body { background: #fff; font-size: 10.5pt; line-height: 1.7; }
  .no-print { display: none !important; }
  .card { box-shadow: none; border-color: #ddd; }
  .chapter { margin-top: 2.2rem; }
  .chapter + .chapter { break-before: page; }
  .chapter-kicker, .chapter-lead { break-after: avoid; }
  .steps > li, .task, .faq details, .box, .checklist label { break-inside: avoid; }
  .faq details { border: 1px solid #ddd; }
  .faq summary::after { display: none; }
  .hero { padding-top: 1rem; }
  .footer { break-inside: avoid; }
  a { color: inherit; text-decoration: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, .quiz-opt, .toc a { transition: none; }
}