:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --text: #1b2330;
  --muted: #67748a;
  --border: #e6eaf1;
  --primary: #4f6ef7;
  --primary-dark: #3a56d4;
  --success: #18a558;
  --shadow: 0 6px 24px rgba(27, 35, 48, 0.06);
  --radius: 14px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Header ---------- */
.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand-logo { font-size: 24px; }
.brand-name { font-size: 20px; }
.brand-sub { color: var(--primary); }
.site-nav { display: flex; gap: 18px; }
.site-nav a { color: var(--muted); font-size: 15px; }
.site-nav a.active, .site-nav a:hover { color: var(--text); text-decoration: none; }

/* ---------- Hero ---------- */
.hero { text-align: center; padding: 40px 0 20px; }
.hero h1 { font-size: 34px; margin: 0 0 12px; letter-spacing: -0.5px; }
.subtitle { color: var(--muted); font-size: 17px; max-width: 640px; margin: 0 auto 18px; }
.subtitle strong { color: var(--text); }
.hero-badges {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 10px; justify-content: center;
}
.hero-badges li {
  background: var(--card); border: 1px solid var(--border);
  padding: 6px 14px; border-radius: 999px; font-size: 14px; color: var(--muted);
}

/* ---------- Tool ---------- */
.tool { margin: 24px 0 8px; }
.dropzone {
  background: var(--card);
  border: 2px dashed #c7d0e0;
  border-radius: var(--radius);
  padding: 48px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s, transform .1s;
}
.dropzone:hover { border-color: var(--primary); }
.dropzone.dragover { border-color: var(--primary); background: #eef2ff; transform: scale(1.005); }
.dropzone-icon { font-size: 44px; }
.dropzone-title { font-size: 18px; margin: 10px 0 4px; }
.dropzone-hint { color: var(--muted); font-size: 14px; margin: 0; }
.link-btn {
  background: none; border: none; color: var(--primary);
  font-size: inherit; cursor: pointer; padding: 0; text-decoration: underline;
}

/* ---------- Controls ---------- */
.controls {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 18px;
  box-shadow: var(--shadow);
}
.control { display: flex; flex-direction: column; gap: 6px; }
.control label { font-weight: 600; font-size: 14px; }
.control small { color: var(--muted); font-size: 12px; }
.control input[type="range"] { width: 100%; accent-color: var(--primary); }
.control select, .control input[type="number"] {
  padding: 9px 12px; border: 1px solid var(--border); border-radius: 10px;
  font-size: 14px; background: #fff; color: var(--text);
}
.control-actions { grid-column: 1 / -1; flex-direction: row; flex-wrap: wrap; gap: 10px; }

.btn {
  border: none; border-radius: 10px; padding: 11px 20px;
  font-size: 15px; font-weight: 600; cursor: pointer; transition: background .15s, opacity .15s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: var(--success); color: #fff; }
.btn-secondary:hover { opacity: .9; }
.btn-ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); }
.btn-ghost:hover { background: #f0f3f8; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ---------- Summary & Results ---------- */
.summary {
  margin: 20px 0 10px; padding: 14px 18px;
  background: #eaf7ef; border: 1px solid #c4e7d2; color: #146c3a;
  border-radius: 12px; font-weight: 600;
}
.results { display: flex; flex-direction: column; gap: 12px; margin-top: 8px; }
.result-card {
  display: flex; align-items: center; gap: 14px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 12px 14px; box-shadow: var(--shadow);
}
.result-thumb {
  width: 64px; height: 64px; object-fit: cover; border-radius: 8px;
  background: #f0f3f8; flex-shrink: 0;
}
.result-info { flex: 1; min-width: 0; }
.result-name { font-weight: 600; font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.result-meta { font-size: 13px; color: var(--muted); }
.result-meta .save { color: var(--success); font-weight: 700; }
.result-meta .save.warn { color: #d97706; }
.result-meta .arrow { margin: 0 6px; }
.result-actions { flex-shrink: 0; }
.download-link {
  display: inline-block; padding: 8px 14px; background: var(--primary);
  color: #fff; border-radius: 8px; font-size: 13px; font-weight: 600;
}
.download-link:hover { background: var(--primary-dark); text-decoration: none; }
.result-card.pending .result-meta { color: var(--muted); }

/* ---------- Ad slots ---------- */
.ad-slot {
  display: flex; align-items: center; justify-content: center;
  min-height: 90px; margin: 18px 0;
  border: 1px dashed #cfd6e4; border-radius: 12px;
  background: repeating-linear-gradient(45deg, #fafbfe, #fafbfe 10px, #f3f5fa 10px, #f3f5fa 20px);
}
.ad-label { color: #aab3c5; font-size: 13px; }
.ad-inline { min-height: 120px; }

/* ---------- FAQ ---------- */
.faq { margin: 36px 0; }
.faq h2 { font-size: 22px; margin-bottom: 14px; }
.faq details {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 14px 18px; margin-bottom: 10px;
}
.faq summary { font-weight: 600; cursor: pointer; }
.faq details p { color: var(--muted); margin: 10px 0 0; }

/* ---------- Footer ---------- */
.site-footer { background: var(--card); border-top: 1px solid var(--border); margin-top: 40px; }
.footer-inner { padding: 26px 0; text-align: center; }
.footer-brand { font-weight: 700; margin-bottom: 8px; }
.footer-nav { display: flex; gap: 16px; justify-content: center; margin-bottom: 10px; }
.footer-nav a { color: var(--muted); font-size: 14px; }
.footer-copy, .footer-icp { color: #99a2b3; font-size: 13px; margin: 4px 0; }

/* ---------- Static content pages ---------- */
.page { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; margin: 28px 0; box-shadow: var(--shadow); }
.page h1 { margin-top: 0; }
.page h2 { font-size: 19px; margin-top: 24px; }
.page p, .page li { color: #3a4459; }
.page h3 { font-size: 16px; margin-top: 18px; }
.page .guide-related { margin-top: 28px; padding-top: 16px; border-top: 1px solid var(--border); font-size: 14px; color: var(--muted); }
.page .guide-note { background: #fff7ed; border-left: 3px solid #fb923c; padding: 10px 14px; border-radius: 8px; font-size: 14px; }

/* ---------- 首页·实用指南 ---------- */
.guides { margin: 8px 0 4px; }
.guides h2 { margin-bottom: 12px; }
.guide-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.guide-card { display: block; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow); transition: transform .15s ease, box-shadow .15s ease; }
.guide-card:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(27,35,48,.1); text-decoration: none; }
.guide-card .gc-title { font-weight: 700; color: var(--text); margin-bottom: 6px; }
.guide-card .gc-desc { font-size: 13px; color: var(--muted); }

/* ---------- 证件照工具 ---------- */
.row2 { display: flex; align-items: center; gap: 8px; }
.row2 input { flex: 1; min-width: 0; }
.row2-x { color: var(--muted); }
.idp-thumb { width: 120px; max-height: 180px; height: auto; border-radius: 8px; border: 1px solid var(--border); object-fit: contain; background: #fff; flex-shrink: 0; }

/* ---------- 图片拼接 ---------- */
.input-thumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.input-thumbs .it { position: relative; }
.input-thumbs img { width: 64px; height: 64px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); background: #fff; }
.input-thumbs .it-idx { position: absolute; top: 2px; left: 2px; background: rgba(0,0,0,.6); color: #fff; font-size: 11px; line-height: 1.6; border-radius: 6px; padding: 0 6px; }
.merge-output { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px; box-shadow: var(--shadow); margin-top: 16px; text-align: center; }
.merge-preview { display: block; max-width: 100%; max-height: 70vh; width: auto; margin: 0 auto 14px; border: 1px solid var(--border); border-radius: 8px; background: #fff; }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .hero h1 { font-size: 26px; }
  .subtitle { font-size: 15px; }
  .controls { grid-template-columns: 1fr; }
  .site-nav { gap: 12px; font-size: 14px; }
  .site-nav a { font-size: 14px; }
  .brand-name { font-size: 18px; }
  .result-thumb { width: 52px; height: 52px; }
}