/* ============================================================
   Looprel — 手作工具站（1108 全量重排版）
   结构：token / nav / hero / tool / 结果区 / 内容区 / footer / 动效 / 打印 / 响应式
   ============================================================ */

/* ---- token ---- */
:root {
  --ink: #2d2a26;
  --paper: #f0efec;
  --card: #ffffff;
  --muted: #6b6558;
  --accent: #8a5a3b;   /* 毛线棕 */
  --accent2: #2e7d43;  /* 线团绿 */
  --line: #e5e0d6;
}
* { box-sizing: border-box; margin: 0; }
body {
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}
a { color: var(--accent); text-decoration: underline; text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--accent); }

/* ---- 框架 ---- */
header, main, footer .foot-inner { max-width: 1080px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }

/* ---- nav ---- */
nav .nav-inner {
  display: flex; justify-content: space-between; align-items: center; gap: 1em; flex-wrap: wrap;
  padding-top: 18px; padding-bottom: 12px;
}
.brand { display: inline-flex; align-items: center; gap: .5em; text-decoration: none; }
.brand svg { width: 30px; height: 30px; }
.nav-links a { color: var(--ink); text-decoration: none; margin-left: 1.3em; font-size: .95rem; font-family: system-ui, sans-serif; }
.nav-links a:first-child { margin-left: 0; }
.nav-links a:hover { color: var(--accent); }

/* ---- hero：左文右图 ---- */
.hero { padding: 3.2rem 0 2.2rem; }
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 3rem; align-items: center; }
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); font-weight: normal; line-height: 1.08; letter-spacing: -.01em; }
.hero .lede { margin-top: 1rem; font-size: 1.12rem; color: var(--muted); max-width: 34ch; }
.hero .trust { list-style: none; padding: 0; margin-top: 1.2rem; display: flex; flex-wrap: wrap; gap: .5em 1.4em; font-family: system-ui, sans-serif; font-size: .88rem; color: var(--muted); }
.hero .trust li::before { content: "·"; color: var(--accent2); margin-right: .45em; font-weight: bold; }
.hero-cta {
  display: inline-block; margin-top: 1.6rem; background: var(--accent2); color: #fff;
  padding: .7em 1.6em; border-radius: 6px; text-decoration: none;
  font-family: system-ui, sans-serif; font-size: 1.02rem;
}
.hero-cta:hover { background: #256338; color: #fff; }
.hero-shot {
  width: 100%; max-width: 480px; height: auto; display: block;
  background: #33413a; padding: 20px; margin: 0 auto;
}

/* ---- 工具卡 ---- */
.tool { background: var(--card); border-radius: 10px; padding: 1.5rem; }
.controls { display: flex; flex-wrap: wrap; gap: 1.2rem 1.6rem; align-items: end; }
.upload-label span {
  display: inline-block; background: var(--accent2); color: #fff;
  padding: .6em 1.3em; border-radius: 6px; cursor: pointer; font-family: system-ui, sans-serif; font-size: 1rem;
}
.upload-label span:hover { background: #256338; }
.controls label, .qr-input { font-size: .92rem; display: flex; flex-direction: column; gap: .35em; font-family: system-ui, sans-serif; color: var(--ink); }
select, .qr-input input {
  padding: .5em .65em; border: 1px solid var(--line); border-radius: 6px; background: #fff; font-size: .95rem;
  font-family: system-ui, sans-serif;
}
fieldset.styles { border: 0; padding: .2em 0 .4em; margin: 0; }
fieldset.styles legend { font-size: .85rem; padding: 0 0 .4em; font-family: system-ui, sans-serif; color: var(--muted); }
fieldset.styles label { display: inline-flex; flex-direction: row; align-items: center; gap: .35em; margin: 0 1em .3em 0; font-size: .9rem; font-family: system-ui, sans-serif; }

/* ---- 结果区 ---- */
.stats { margin: 1.2rem 0 .5rem; font-family: system-ui, sans-serif; font-size: .92rem; color: var(--muted); }
#chart { overflow-x: auto; background: #fff; }
#chart canvas, #qrgrid canvas { max-width: 100%; height: auto; } /* 整图完整显示 */
.legend { display: flex; flex-wrap: wrap; gap: .5em 1.1em; margin-top: .9rem; font-family: system-ui, sans-serif; font-size: .85rem; }
.legend .lg { display: inline-flex; align-items: center; gap: .35em; }
.legend .lg i { width: 13px; height: 13px; border: 1px solid #0002; display: inline-block; }
.legend .lg em { color: #999; font-style: normal; }
.hint { margin-top: .7rem; font-size: .88rem; color: var(--muted); font-family: system-ui, sans-serif; max-width: 70ch; }
.action-bar { display: flex; flex-wrap: wrap; gap: .9rem; margin-top: 1.2rem; align-items: center; }
.btn-primary { background: var(--accent2); color: #fff; border: 0; padding: .68em 1.5em; border-radius: 6px; cursor: pointer; font-size: 1rem; font-family: system-ui, sans-serif; }
.btn-primary:hover { background: #256338; }
.btn-secondary { background: transparent; color: var(--accent2); border: 1.5px solid var(--accent2); padding: .62em 1.4em; border-radius: 6px; cursor: pointer; font-size: .95rem; font-family: system-ui, sans-serif; }
.btn-secondary:hover { background: color-mix(in srgb, var(--accent2) 8%, transparent); }
.print-btn { background: var(--accent); color: #fff; border: 0; padding: .65em 1.4em; border-radius: 6px; cursor: pointer; font-size: .98rem; font-family: system-ui, sans-serif; }
.print-btn:hover { background: #6f4629; }
.scan-box { margin-top: 1.2rem; background: color-mix(in srgb, var(--accent2) 4%, var(--card)); padding: .9rem 1rem; border-radius: 8px; }
.scan-box summary { cursor: pointer; font-family: system-ui, sans-serif; font-size: .95rem; }
.scan-box canvas { max-width: 340px; height: auto; margin-top: .6rem; }

/* ---- 内容区 ---- */
.howto, .faq, .article { margin-top: 3.2rem; }
.howto h2, .faq h2, .article h1 { font-weight: normal; margin-bottom: 1rem; }
.howto ol { padding-left: 1.4rem; }
.howto li { margin-bottom: .55em; max-width: 68ch; }
.howto p, .faq p, .article p, .article li { max-width: 68ch; }
.demo { display: block; margin: .4rem 0 1.2rem; max-width: 560px; height: auto; }
.faq details { padding: 1em 0; margin-bottom: .1em; }
.faq summary { cursor: pointer; font-family: system-ui, sans-serif; font-size: .98rem; }
.article .lede { font-size: 1.12rem; color: var(--muted); margin-bottom: 1.6rem; }
.article h2 { font-weight: normal; margin: 2.2rem 0 .8rem; }
.article ul, .article ol { padding-left: 1.4rem; margin-bottom: .8rem; }
.article li { margin-bottom: .4em; }

/* ---- footer ---- */
footer { margin-top: 4rem; padding: 1.8rem 24px 2.4rem; }
footer .foot-inner { color: var(--muted); font-size: .88rem; text-align: center; }
footer a { color: var(--muted); }

/* ---- 动效（entrance，reduced-motion 兜底） ---- */
@media (prefers-reduced-motion: no-preference) {
  .hero-copy > *, .hero-shot, .tool, .howto, .faq { animation: rise-in .55s ease both; }
  .hero-copy > *:nth-child(2) { animation-delay: .06s; }
  .hero-copy > *:nth-child(3) { animation-delay: .12s; }
  .hero-copy > *:nth-child(4) { animation-delay: .18s; }
  .hero-shot { animation-delay: .1s; }
  .tool { animation-delay: .14s; }
  .howto { animation-delay: .2s; }
  .faq { animation-delay: .26s; }
  @keyframes rise-in { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
}

/* ---- 打印：只打网格与图例 ---- */
@media print {
  .no-print, header, footer, .hero, .howto, .faq, .stats, .action-bar, .scan-box { display: none !important; }
  body { background: #fff; }
  .tool { padding: 0; }
  #chart canvas, #qrgrid canvas { max-width: 100%; height: auto; }
}

/* ---- 响应式 ---- */
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 1.8rem; }
  .hero-shot { max-width: 420px; }
  .nav-links a { margin-left: .9em; font-size: .88rem; }
  .controls { gap: 1rem; }
}
@media (max-width: 520px) {
  nav .nav-inner { flex-direction: column; align-items: flex-start; gap: .5em; }
  .nav-links a { margin-left: 0; margin-right: 1em; }
  .hero { padding-top: 2.2rem; }
  .hero h1 { font-size: clamp(1.9rem, 8.5vw, 2.5rem); }
}

/* ---- lightbox：点击看大图（1108） ---- */
#lightbox {
  display: none; position: fixed; inset: 0; z-index: 999;
  background: rgba(24, 22, 19, .88);
  align-items: center; justify-content: center; cursor: zoom-out;
  padding: 24px;
}
#lightbox.open { display: flex; }
#lightbox img {
  max-width: min(95vw, 1400px); max-height: 92vh;
  background: #fff; padding: 10px;
}
footer img { vertical-align: middle; }