:root {
  --bg:#f5f8f7;
  --card:#ffffff;
  --card-soft:#f9fbfa;
  --text:#18352c;
  --muted:#71827c;
  --line:#dfe9e5;
  --primary:#2f8f6b;
  --primary-strong:#237758;
  --primary-soft:#e8f5ef;
  --accent:#f2a65a;
  --danger:#c95f5f;
  --shadow:0 18px 55px rgba(25,74,57,.08);
  --radius:22px;
  --g:#0b9b78;
  --g2:#12b58c;
  --dark:#0b2135;
  --footer-text:#d4ede8;
}
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  margin:0;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--text);
  background:
    radial-gradient(circle at 15% -10%,rgba(85,177,139,.16),transparent 32%),
    radial-gradient(circle at 88% 6%,rgba(242,166,90,.12),transparent 26%),
    var(--bg);
  min-height:100vh;
}
a { color:inherit; text-decoration:none; }
button,input,select,textarea { font:inherit; }
button { -webkit-tap-highlight-color:transparent; cursor:pointer; }
button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,.dropzone:focus-visible,.page-card:focus-visible { outline:3px solid rgba(47,143,107,.2); outline-offset:2px; }
[hidden] { display:none!important; }
.page { width:min(1160px,calc(100% - 32px)); margin:0 auto; }

/* ===== 与 PDF Merger 保持一致的顶部导航 ===== */
.site-header {
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(255,255,255,.95);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.site-header .nav { height:82px; display:flex; align-items:center; gap:28px; position:relative; }
.site-header .brand { display:flex; align-items:center; gap:12px; min-width:230px; text-decoration:none; color:inherit; }
.site-header .mark {
  width:48px; height:48px; border-radius:14px;
  background:linear-gradient(145deg,#17bd92,#078d6d); color:#fff;
  display:grid; place-items:center; box-shadow:0 12px 24px rgba(11,155,120,.22); flex:0 0 48px;
}
.site-header .mark svg { width:24px; height:24px; }
.site-header .brand strong { display:block; color:var(--dark); font-size:21px; line-height:1.2; }
.site-header .brand small { display:block; color:var(--muted); font-size:13px; margin-top:4px; }
.site-header .navlinks { display:flex; gap:26px; align-items:center; justify-content:center; flex:1; }
.site-header .navlinks a {
  font-weight:700; font-size:16px; color:#405463; padding:27px 0; position:relative;
  text-decoration:none; transition:color .2s ease,transform .2s ease;
}
.site-header .navlinks a::after {
  content:''; position:absolute; left:50%; right:50%; bottom:18px; height:3px; border-radius:999px;
  background:linear-gradient(90deg,#17bd92,#078d6d); opacity:0;
  box-shadow:0 3px 9px rgba(11,155,120,.22); transition:left .22s ease,right .22s ease,opacity .18s ease;
}
.site-header .navlinks a:hover,.site-header .navlinks a.active { color:var(--g); transform:translateY(-1px); }
.site-header .navlinks a:hover::after,.site-header .navlinks a.active::after { left:0; right:0; opacity:1; }
.site-header .actions { display:flex; gap:10px; }
.site-header .btn {
  display:inline-flex; align-items:center; justify-content:center; min-height:46px; padding:0 20px;
  border-radius:12px; font-weight:800; font-size:16px; border:1px solid transparent; text-decoration:none;
}
.site-header .btn.primary { color:#fff; background:linear-gradient(135deg,#12b58c,#078f70); box-shadow:0 10px 24px rgba(11,155,120,.2); }
.site-header .btn.ghost { color:#087b61; border-color:#a3dccf; background:#fff; }
.site-header .menu { display:none; margin-left:auto; background:none; border:0; width:44px; height:44px; font-size:25px; cursor:pointer; color:#405463; }
.mobile-share-link { display:none!important; }

/* ===== PDF Merger 同款 Hero ===== */
.hero { text-align:center; padding:64px 0 34px; }
.hero-badges { display:flex; align-items:center; justify-content:center; flex-wrap:wrap; gap:8px; margin-bottom:16px; }
.hero-badge { display:inline-flex; align-items:center; gap:8px; padding:7px 12px; border-radius:999px; background:var(--primary-soft); color:var(--primary-strong); font-size:13px; font-weight:750; }
.hero-badge::before { content:""; width:7px; height:7px; border-radius:50%; background:var(--primary); box-shadow:0 0 0 5px rgba(47,143,107,.1); }
.hero h1 { margin:0; font-size:clamp(32px,5vw,54px); line-height:1.12; letter-spacing:-.045em; }
.hero-title-link { transition:color .18s ease; }
.hero-title-link:hover { color:var(--primary-strong); }
.feature-update { margin-top:12px; color:#709087; font-size:13px; font-weight:700; }
.hero p { width:min(800px,100%); margin:18px auto 0; font-size:17px; line-height:1.8; color:var(--muted); }

/* ===== PDF Merger 同款主工具外壳和上传区 ===== */
.tool-shell { background:rgba(255,255,255,.9); border:1px solid rgba(217,231,225,.92); box-shadow:var(--shadow); border-radius:28px; overflow:hidden; margin-bottom:28px; }
.tool-main { padding:28px; }
.dropzone { min-height:310px; border:2px dashed #c9ddd4; border-radius:20px; background:linear-gradient(180deg,#fbfdfc,#f7fbf9); display:grid; place-items:center; padding:30px; text-align:center; cursor:pointer; transition:.2s ease; outline:none; }
.dropzone:hover,.dropzone.dragover,.dropzone:focus-visible { border-color:var(--primary); background:#f1faf6; transform:translateY(-1px); }
.drop-inner { width:min(100%,640px); }
.upload-icon { width:68px; height:68px; margin:0 auto 17px; border-radius:20px; display:grid; place-items:center; background:var(--primary-soft); color:var(--primary); }
.upload-icon svg { width:34px; height:34px; }
.drop-title { font-size:22px; font-weight:800; margin-bottom:7px; }
.drop-sub { color:var(--muted); font-size:14px; line-height:1.7; }
.drop-limit { margin-top:14px; color:#95a39e; font-size:12px; }

/* ===== 选择 PDF 后的本地读取 / 解析进度 ===== */
.dropzone.is-loading { cursor:default; border-style:solid; border-color:#cfe3da; background:linear-gradient(180deg,#fbfefc,#f3faf7); transform:none!important; }
.dropzone.is-loading:hover,.dropzone.is-loading:focus-visible { border-color:#cfe3da; background:linear-gradient(180deg,#fbfefc,#f3faf7); transform:none; }
.load-progress-panel { width:min(100%,690px); margin:0 auto; text-align:left; }
.load-progress-icon { width:66px; height:66px; margin:0 auto 16px; border-radius:20px; display:grid; place-items:center; position:relative; background:var(--primary-soft); color:var(--primary); }
.load-progress-icon svg { width:31px; height:31px; position:relative; z-index:2; }
.load-progress-icon span { position:absolute; inset:-5px; border:3px solid rgba(47,143,107,.13); border-top-color:var(--primary); border-radius:50%; animation:pdfLocalReadSpin 1.05s linear infinite; }
@keyframes pdfLocalReadSpin { to { transform:rotate(360deg); } }
.load-progress-kicker { text-align:center; color:var(--primary-strong); font-size:12px; font-weight:800; letter-spacing:.08em; }
.load-progress-file { margin:8px auto 0; max-width:620px; text-align:center; color:var(--text); font-size:20px; font-weight:800; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.load-progress-meta { margin-top:5px; text-align:center; color:var(--muted); font-size:12px; }
.load-progress-head { margin-top:25px; display:flex; align-items:center; justify-content:space-between; gap:18px; color:#49675a; font-size:13px; }
.load-progress-head strong { color:#244f3c; font-size:14px; }
.load-progress-head span { flex:0 0 auto; color:var(--primary-strong); font-weight:850; font-variant-numeric:tabular-nums; }
.load-progress-track { height:12px; margin-top:10px; overflow:hidden; border-radius:999px; background:#deebe5; box-shadow:inset 0 1px 2px rgba(33,84,62,.06); }
.load-progress-bar { width:0; height:100%; border-radius:inherit; background:linear-gradient(90deg,var(--primary),#52bd87); transition:width .18s ease; position:relative; overflow:hidden; }
.load-progress-bar::after { content:""; position:absolute; inset:0; background:linear-gradient(110deg,transparent 20%,rgba(255,255,255,.34) 45%,transparent 70%); transform:translateX(-100%); animation:pdfProgressShine 1.45s ease-in-out infinite; }
@keyframes pdfProgressShine { 55%,100% { transform:translateX(120%); } }
.load-progress-detail { margin-top:10px; min-height:19px; color:#7d9289; font-size:12px; line-height:1.6; text-align:center; }
@media (prefers-reduced-motion:reduce) {
  .load-progress-icon span,.load-progress-bar::after { animation:none; }
  .load-progress-bar { transition:none; }
}

.primary-btn,.secondary-btn,.ghost-btn,.mini-btn,.download-one { border:0; border-radius:12px; padding:12px 18px; font-weight:750; cursor:pointer; transition:.18s ease; }
.primary-btn { color:#fff; background:linear-gradient(135deg,var(--primary),var(--primary-strong)); box-shadow:0 10px 24px rgba(47,143,107,.2); }
.primary-btn:hover:not(:disabled) { transform:translateY(-1px); box-shadow:0 13px 28px rgba(47,143,107,.25); }
.primary-btn:disabled { cursor:not-allowed; opacity:.5; box-shadow:none; }
.secondary-btn,.mini-btn { color:var(--primary-strong); background:var(--primary-soft); border:1px solid #d5e9e0; }
.secondary-btn:hover,.mini-btn:hover { background:#def1e8; }
.ghost-btn { color:var(--muted); background:transparent; border:1px solid var(--line); }
.ghost-btn:hover { background:#f7faf8; color:var(--text); }
.danger-text { color:var(--danger); }
.choose-btn { margin-top:19px; min-width:190px; }

/* ===== 上传后的工作区沿用 PDF Merger 的信息层级 ===== */
.pdf-workspace { margin-top:4px; }
.workspace-head { display:flex; justify-content:space-between; align-items:flex-end; gap:20px; padding:4px 0 20px; }
.workspace-head h2,.panel-head h2,.content-head h2,.result-top h2 { margin:3px 0 0; font-size:22px; letter-spacing:-.02em; }
.workspace-head h2 { max-width:740px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.workspace-head p,.content-head p,.result-top p { margin:8px 0 0; color:var(--muted); font-size:14px; line-height:1.7; }
.workspace-actions { display:flex; gap:9px; flex-wrap:wrap; }
.section-kicker { color:var(--primary); font-size:12px; font-weight:800; letter-spacing:.08em; text-transform:uppercase; }
.pdf-summary-bar { display:grid; grid-template-columns:repeat(3,1fr); gap:10px; margin-bottom:20px; }
.pdf-summary-bar > div { background:#f7faf8; border:1px solid var(--line); border-radius:14px; padding:13px 15px; }
.pdf-summary-bar span { display:block; color:var(--muted); font-size:11px; margin-bottom:4px; }
.pdf-summary-bar strong { display:block; font-size:15px; color:var(--text); }

.editor-grid { display:grid; grid-template-columns:minmax(0,1.7fr) minmax(340px,.75fr); gap:20px; align-items:start; }
.panel { border:1px solid var(--line); border-radius:20px; background:#fff; overflow:hidden; }
.panel-head { display:flex; justify-content:space-between; align-items:flex-start; gap:16px; padding:18px 20px; border-bottom:1px solid #edf2f0; background:#fbfdfc; }
.panel-body { padding:18px 20px 20px; }
.page-toolbar { display:flex; gap:7px; flex-wrap:wrap; align-items:center; justify-content:flex-end; }
.page-toolbar .mini-btn { min-height:34px; padding:0 11px; font-size:12px; }
.selection-count { font-size:11px; color:var(--muted); background:#f5f8f7; border:1px solid var(--line); padding:6px 8px; border-radius:999px; white-space:nowrap; }
.pages-wrap { max-height:690px; overflow:auto; padding:16px; background:repeating-conic-gradient(#eef3f1 0 25%,#f9fbfa 0 50%) 50%/22px 22px; }
.pages-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(128px,1fr)); gap:13px; }
.page-card { position:relative; border-radius:14px; background:#fff; border:2px solid transparent; box-shadow:0 5px 16px rgba(40,79,58,.08); overflow:hidden; cursor:pointer; transition:.16s; user-select:none; }
.page-card:hover { transform:translateY(-2px); box-shadow:0 9px 22px rgba(40,79,58,.12); }
.page-card.selected { border-color:var(--primary); background:var(--primary-soft); box-shadow:0 0 0 3px rgba(47,143,107,.10); }
.page-thumb { aspect-ratio:.72; display:grid; place-items:center; background:#eef4f0; overflow:hidden; position:relative; }
.page-thumb canvas { width:100%; height:100%; object-fit:contain; background:#fff; }
.page-skeleton { width:60%; height:7px; border-radius:9px; background:#dbe8e0; box-shadow:0 17px 0 #dbe8e0,0 34px 0 #e5eee9,0 51px 0 #e5eee9; }
.page-card-footer { height:38px; display:flex; align-items:center; justify-content:space-between; padding:0 10px; font-size:12px; color:#5d7367; font-weight:700; }
.page-check { width:22px; height:22px; border-radius:50%; background:#fff; border:1px solid #bcd0c4; display:grid; place-items:center; color:transparent; font-weight:900; }
.page-card.selected .page-check { background:var(--primary); border-color:var(--primary); color:#fff; }
.page-load-error { font-size:11px; color:#9a5555; text-align:center; padding:8px; }

.settings-panel { position:sticky; top:102px; }
.mode-tabs { display:grid; grid-template-columns:repeat(2,1fr); gap:8px; margin-bottom:18px; }
.mode-tab { border:1px solid var(--line); background:#f8fbf9; color:#496657; border-radius:12px; padding:10px 8px; text-align:center; font-size:13px; font-weight:750; transition:.18s ease; }
.mode-tab:hover { border-color:#bed8cd; }
.mode-tab.active { border-color:var(--primary); background:var(--primary-soft); box-shadow:0 0 0 2px rgba(47,143,107,.08); color:var(--primary-strong); }
.setting-group { margin-top:16px; }
.setting-group:first-child { margin-top:0; }
.setting-label { display:flex; align-items:center; justify-content:space-between; gap:10px; margin-bottom:9px; color:#385149; font-size:13px; font-weight:750; }
.setting-hint { color:#91a09b; font-weight:600; font-size:11px; }
.input,.textarea,.number-input { width:100%; border:1px solid #d7e4de; background:#fff; color:var(--text); border-radius:11px; padding:11px 12px; outline:none; transition:.18s ease; }
.textarea { min-height:78px; resize:vertical; }
.input:focus,.textarea:focus,.number-input:focus { border-color:var(--primary); box-shadow:0 0 0 3px rgba(47,143,107,.1); }
.field-help { margin:6px 0 0; color:var(--muted); font-size:11px; line-height:1.55; }
.field-error { min-height:17px; margin:5px 0 0; color:var(--danger); font-size:11px; }
.radio-list { display:grid; gap:7px; }
.radio-row { display:flex; gap:10px; align-items:flex-start; padding:10px; border:1px solid var(--line); border-radius:11px; background:#fbfdfc; cursor:pointer; }
.radio-row input { margin-top:4px; accent-color:var(--primary); }
.radio-row strong { display:block; color:var(--text); font-size:13px; }
.radio-row > span > span { display:block; margin-top:2px; color:var(--muted); font-size:11px; line-height:1.5; }
.quick-values { display:grid; grid-template-columns:repeat(4,1fr); gap:7px; margin-top:8px; }
.quick-value { border:1px solid var(--line); background:#f8fbf9; color:#536b60; border-radius:9px; min-height:34px; font-size:11px; font-weight:700; }
.quick-value:hover { border-color:var(--primary); color:var(--primary-strong); background:var(--primary-soft); }
.mode-message { padding:13px; border-radius:12px; background:#f7faf8; border:1px solid var(--line); color:var(--muted); font-size:12px; line-height:1.7; }
.mode-message strong { color:var(--text); }
.naming-box { border-top:1px solid #edf2f0; margin-top:18px; padding-top:17px; }
.primary-action { width:100%; margin-top:18px; min-height:50px; display:flex; align-items:center; justify-content:center; gap:8px; font-size:14px; }
.secondary-actions { display:grid; grid-template-columns:1fr 1fr; gap:9px; margin-top:9px; }
.secondary-actions button { min-height:42px; font-size:12px; padding:9px 10px; }
.warning-note { margin-top:10px; padding:10px 11px; border-radius:10px; background:#fff6eb; border:1px solid #f3d5b2; color:#9b6129; font-size:11px; line-height:1.55; }

.progress-card { margin-top:18px; border:1px solid #dbe9e1; background:#f8fcfa; border-radius:16px; padding:15px 17px; }
.progress-head { display:flex; justify-content:space-between; gap:12px; color:#466354; font-size:13px; }
.progress-head strong { color:#1c4f37; }
.progress-track { height:9px; border-radius:999px; background:#e3eee8; margin-top:10px; overflow:hidden; }
.progress-bar { height:100%; width:0; background:linear-gradient(90deg,var(--primary),#53b981); transition:width .25s; }

.result-card { margin-top:22px; border:1px solid #cfe5da; background:linear-gradient(180deg,#fbfffd,#f3faf7); border-radius:20px; padding:22px; }
.result-top { display:flex; align-items:center; gap:14px; }
.result-icon { width:48px; height:48px; border-radius:15px; display:grid; place-items:center; background:var(--primary); color:#fff; font-size:23px; font-weight:900; box-shadow:0 10px 22px rgba(47,143,107,.19); }
.result-stats { display:grid; grid-template-columns:repeat(4,1fr); gap:10px; margin:20px 0; }
.result-stats div { background:#fff; border:1px solid var(--line); border-radius:14px; padding:13px; }
.result-stats span { display:block; color:var(--muted); font-size:11px; margin-bottom:4px; }
.result-stats strong { font-size:15px; }
.result-list { display:grid; gap:8px; max-height:360px; overflow:auto; }
.result-item { display:grid; grid-template-columns:minmax(0,1fr) auto auto; gap:10px; align-items:center; background:#fff; border:1px solid var(--line); border-radius:12px; padding:10px 12px; }
.result-name { min-width:0; }
.result-name strong { display:block; font-size:13px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.result-name span { display:block; font-size:10px; color:#82938a; margin-top:2px; }
.result-size { font-size:11px; color:#60786b; }
.download-one { min-height:34px; padding:0 11px; background:var(--primary-soft); color:var(--primary-strong); border:1px solid #cee9d9; font-size:11px; }
.result-actions { display:flex; gap:9px; flex-wrap:wrap; margin-top:16px; }
.component-note { margin-top:12px; color:#91a09b; font-size:10px; line-height:1.6; text-align:center; }

/* ===== PDF Merger 同款功能特点、说明和 FAQ ===== */
.feature-strip { display:grid; grid-template-columns:repeat(4,1fr); gap:14px; margin:28px 0; }
.feature-strip article { display:flex; align-items:flex-start; gap:12px; background:rgba(255,255,255,.78); border:1px solid var(--line); border-radius:17px; padding:17px; }
.feature-icon { width:38px; height:38px; border-radius:12px; display:grid; place-items:center; flex:0 0 38px; background:var(--primary-soft); color:var(--primary); }
.feature-icon svg { width:21px; height:21px; }
.feature-strip strong { display:block; font-size:14px; }
.feature-strip p { margin:5px 0 0; color:var(--muted); font-size:11px; line-height:1.6; }
.content-card { background:rgba(255,255,255,.82); border:1px solid var(--line); border-radius:22px; box-shadow:0 12px 38px rgba(25,74,57,.045); padding:28px; margin:26px 0; }
.content-head { text-align:center; max-width:720px; margin:0 auto 22px; }
.steps-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:14px; }
.steps-grid article { border:1px solid var(--line); border-radius:16px; padding:18px; background:#fff; }
.steps-grid article > span { display:inline-grid; place-items:center; width:32px; height:32px; border-radius:10px; background:var(--primary-soft); color:var(--primary-strong); font-weight:850; font-size:12px; }
.steps-grid h3 { margin:14px 0 6px; font-size:15px; }
.steps-grid p,.faq-card details p { margin:0; color:var(--muted); font-size:12px; line-height:1.75; }
.faq-card details { border-top:1px solid var(--line); padding:15px 2px; }
.faq-card details:last-child { border-bottom:1px solid var(--line); }
.faq-card summary { cursor:pointer; font-weight:750; font-size:14px; list-style:none; position:relative; padding-right:28px; }
.faq-card summary::-webkit-details-marker { display:none; }
.faq-card summary::after { content:"+"; position:absolute; right:4px; top:50%; transform:translateY(-50%); font-size:20px; color:#6d887e; font-weight:400; }
.faq-card details[open] summary::after { content:"−"; }
.faq-card details p { margin-top:9px; }

/* ===== PDF Merger 同款深绿色页脚 ===== */
.site-footer { margin-top:48px; background:linear-gradient(135deg,#063f41,#07574d); border-top:0; color:var(--footer-text); padding:56px 0 26px; }
.footer-grid { display:grid; grid-template-columns:1.7fr repeat(3,1fr); gap:36px; }
.site-footer .footer-brand .brand { display:inline-flex; align-items:center; gap:11px; color:inherit; }
.site-footer .footer-brand .brand-mark { width:48px; height:48px; border-radius:14px; display:grid; place-items:center; background:linear-gradient(145deg,#17bd92,#078d6d); color:#fff; box-shadow:0 12px 24px rgba(11,155,120,.22); }
.site-footer .footer-brand .brand-mark svg { width:24px; height:24px; }
.site-footer .footer-brand .brand-copy { display:grid; line-height:1.12; gap:3px; }
.site-footer .footer-brand .brand-copy strong { color:#fff; font-size:21px; line-height:1.2; }
.site-footer .footer-brand .brand-copy small,.site-footer .footer-brand p { color:#b9d6d0; }
.footer-brand p { max-width:350px; font-size:12px; line-height:1.7; }
.footer-pills { display:flex; flex-wrap:wrap; gap:7px; }
.site-footer .footer-pills span { color:#d4ede8; background:transparent; border:1px solid rgba(255,255,255,.16); padding:5px 8px; border-radius:999px; font-size:10px; font-weight:700; }
.footer-grid h3 { color:#fff; font-size:13px; margin:4px 0 12px; }
.footer-grid > div:not(.footer-brand) { display:flex; flex-direction:column; gap:9px; }
.footer-grid a { color:#c4dfda; text-decoration:none; font-size:12px; }
.footer-grid a:hover { color:#fff; }
.footer-bottom { border-top:1px solid rgba(255,255,255,.13); margin-top:30px; padding-top:17px; display:flex; justify-content:space-between; gap:20px; color:#b6d2cd; font-size:11px; }
.footer-bottom p { margin:0; }

/* ===== PDF Merger 同款分享弹窗 ===== */
.share-modal { position:fixed; inset:0; z-index:2200; display:none; align-items:center; justify-content:center; padding:20px; background:rgba(5,35,33,.48); backdrop-filter:blur(6px); -webkit-backdrop-filter:blur(6px); }
.share-modal.show { display:flex; }
.share-dialog { width:min(520px,100%); border-radius:22px; background:#fff; overflow:hidden; box-shadow:0 24px 70px rgba(5,50,43,.22); }
.share-dialog-head { padding:18px 20px; border-bottom:1px solid #e4efeb; display:flex; align-items:flex-start; justify-content:space-between; gap:15px; background:linear-gradient(180deg,#fbfefd,#f7fbfa); }
.share-dialog-head strong { display:block; color:#193f34; font-size:17px; }
.share-dialog-head span { display:block; margin-top:4px; color:#758a82; font-size:12px; }
.share-close { width:34px; height:34px; border-radius:10px; border:1px solid #dce9e4; background:#fff; color:#60766e; font-size:22px; line-height:1; }
.share-dialog-body { padding:20px; }
.share-qr-row { display:flex; gap:17px; align-items:center; }
.share-qr-box { width:128px; height:128px; padding:7px; border:1px solid #dde8e2; border-radius:14px; background:#fff; flex:0 0 auto; }
.share-qr-box img { display:block; width:100%; height:100%; }
.share-copy h3 { margin:0; font-size:17px; color:#264a3f; }
.share-copy p { margin:5px 0 0; color:#6b7f74; font-size:12px; line-height:1.7; }
.share-link-box { display:flex; gap:8px; margin-top:16px; border:1px solid #dce8e1; background:#f9fcfa; border-radius:12px; padding:6px 6px 6px 10px; align-items:center; }
.share-link-text { min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; font-size:11px; color:#61786b; flex:1; }
.share-action { border:1px solid #cfe2d7; background:#fff; color:#276147; border-radius:9px; min-height:36px; padding:0 12px; font-weight:700; }
.share-dialog-actions { margin-top:9px; }
.share-action.primary { background:var(--primary); color:#fff; border-color:var(--primary); width:100%; }
.share-feedback { display:none; margin-top:9px; border-radius:10px; padding:8px 10px; background:#edf8f2; color:#267148; font-size:11px; }
.share-feedback.show { display:flex; gap:7px; align-items:center; }
.share-feedback.error { background:#fff0f0; color:#934747; }
.share-privacy { text-align:center; color:#87988f; font-size:10px; margin-top:10px; }

.topbtn { position:fixed; right:22px; bottom:22px; width:44px; height:44px; border-radius:14px; border:1px solid #d6e5de; background:rgba(255,255,255,.92); color:var(--primary); box-shadow:0 10px 28px rgba(24,53,44,.12); display:grid; place-items:center; cursor:pointer; opacity:0; transform:translateY(10px); pointer-events:none; transition:.18s ease; backdrop-filter:blur(10px); z-index:20; }
.topbtn.show { opacity:1; transform:none; pointer-events:auto; }
.topbtn svg { width:22px; height:22px; }
.toast { position:fixed; left:50%; bottom:26px; transform:translate(-50%,20px); background:#18352c; color:#fff; padding:10px 14px; border-radius:10px; font-size:12px; opacity:0; visibility:hidden; pointer-events:none; transition:.2s ease; z-index:2300; box-shadow:0 10px 30px rgba(0,0,0,.16); }
.toast.show { opacity:1; visibility:visible; transform:translate(-50%,0); }
.toast.error { background:#8f4242; }
.toast.warn { background:#806124; }

@media (max-width:1020px) {
  .editor-grid { grid-template-columns:1fr; }
  .settings-panel { position:static; }
  .feature-strip { grid-template-columns:repeat(2,1fr); }
  .footer-grid { grid-template-columns:1.4fr 1fr 1fr; }
  .footer-grid > div:last-child { display:none; }
}

@media (max-width:1000px) {
  .site-header .actions { display:none; }
  .site-header .menu { display:block; }
  .site-header .navlinks {
    display:none; position:fixed; left:0; right:0; top:74px; width:100vw; max-width:none; margin:0;
    padding:12px 0 16px; border:0; border-top:1px solid var(--line); border-radius:0;
    background:rgba(255,255,255,.985); box-shadow:0 18px 38px rgba(13,75,61,.11); backdrop-filter:blur(14px);
    flex-direction:column; align-items:stretch; gap:0; max-height:calc(100vh - 74px); overflow-y:auto;
  }
  .site-header .navlinks.open { display:flex; }
  .site-header .navlinks a { display:block; width:100%; padding:13px 28px; transform:none; }
  .site-header .navlinks a::after { display:none; }
  .site-header .navlinks a span { display:inline-block; position:relative; padding-bottom:5px; }
  .site-header .navlinks a span::after { content:''; position:absolute; left:50%; right:50%; bottom:0; height:3px; border-radius:999px; background:linear-gradient(90deg,#17bd92,#078d6d); opacity:0; transition:left .22s ease,right .22s ease,opacity .18s ease; }
  .site-header .navlinks a:hover span::after,.site-header .navlinks a.active span::after { left:0; right:0; opacity:1; }
  .mobile-share-link { display:block!important; }
}

@media (max-width:760px) {
  .load-progress-panel { width:100%; }
  .load-progress-file { font-size:17px; }
  .load-progress-head { align-items:flex-start; gap:10px; }
  .load-progress-head strong { font-size:13px; line-height:1.45; }
  .load-progress-detail { text-align:left; }
  .page { width:min(100% - 22px,1160px); }
  .site-header .nav { height:74px; gap:12px; }
  .site-header .brand { min-width:0; }
  .site-header .mark { width:44px; height:44px; border-radius:13px; flex-basis:44px; }
  .site-header .brand strong { font-size:17px; }
  .site-header .brand small { font-size:11px; }
  .hero { padding:43px 0 24px; }
  .hero h1 { font-size:34px; }
  .hero p { font-size:14px; line-height:1.75; }
  .hero-badges { gap:6px; }
  .hero-badge { font-size:11px; padding:6px 9px; }
  .tool-shell { border-radius:20px; }
  .tool-main { padding:15px; }
  .dropzone { min-height:270px; padding:22px 15px; }
  .drop-title { font-size:19px; }
  .workspace-head { align-items:flex-start; flex-direction:column; }
  .workspace-head h2 { max-width:100%; }
  .workspace-actions { width:100%; }
  .workspace-actions button { flex:1; }
  .pdf-summary-bar { grid-template-columns:1fr 1fr; }
  .pdf-summary-bar > div:last-child { grid-column:1/-1; }
  .panel { border-radius:16px; }
  .panel-head { padding:15px; flex-direction:column; }
  .page-toolbar { justify-content:flex-start; }
  .pages-wrap { max-height:540px; padding:10px; }
  .pages-grid { grid-template-columns:repeat(2,minmax(0,1fr)); gap:9px; }
  .panel-body { padding:15px; }
  .mode-tabs { grid-template-columns:1fr 1fr; }
  .secondary-actions { grid-template-columns:1fr; }
  .result-stats { grid-template-columns:repeat(2,1fr); }
  .result-item { grid-template-columns:minmax(0,1fr) auto; }
  .result-size { display:none; }
  .result-actions button { width:100%; }
  .feature-strip { grid-template-columns:1fr; gap:9px; }
  .content-card { padding:20px 16px; }
  .steps-grid { grid-template-columns:1fr 1fr; }
  .footer-grid { grid-template-columns:1fr 1fr; gap:28px 18px; }
  .footer-grid .footer-brand { grid-column:1/-1; }
  .footer-grid > div:last-child { display:flex; }
  .footer-bottom { flex-direction:column; gap:7px; }
  .share-qr-row { align-items:flex-start; }
  .share-qr-box { width:122px; height:122px; }
  .topbtn { right:14px; bottom:14px; }
}

@media (max-width:480px) {
  .site-header .brand { gap:9px; }
  .site-header .mark { width:43px; height:43px; border-radius:13px; flex-basis:43px; }
  .site-header .brand strong { font-size:16px; }
  .site-header .brand small { font-size:10px; margin-top:3px; }
  .hero-badges { gap:6px; }
  .hero-badge { padding:6px 9px; font-size:10px; }
  .hero h1 { font-size:31px; }
  .quick-values { grid-template-columns:repeat(2,1fr); }
  .steps-grid { grid-template-columns:1fr; }
  .footer-grid { grid-template-columns:1fr; }
  .footer-grid .footer-brand { grid-column:auto; }
  .share-dialog-body { padding:17px; }
  .share-qr-row { display:block; }
  .share-qr-box { margin:0 auto; }
  .share-copy { text-align:center; margin-top:12px; }
}

@media (prefers-reduced-motion:reduce) {
  html { scroll-behavior:auto; }
  *,*::before,*::after { animation-duration:.01ms!important; animation-iteration-count:1!important; transition-duration:.01ms!important; }
}

/* ===== 旧版 HTML 结构兼容层 =====
   防止服务器/CDN/浏览器只更新了 styles.css、但 index.html 仍是旧版时出现截图中的纵向错位。
   新版 index.html 不依赖这些类；保留它们用于平滑覆盖更新和缓存兼容。 */
.section-block { margin:26px 0; }
.section-heading { text-align:center; max-width:720px; margin:0 auto 22px; }
.section-heading > span { color:var(--primary); font-size:12px; font-weight:800; letter-spacing:.08em; text-transform:uppercase; }
.section-heading h2 { margin:6px 0 0; font-size:22px; letter-spacing:-.02em; }
.section-heading p { margin:8px 0 0; color:var(--muted); font-size:14px; line-height:1.7; }
.feature-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:14px; }
.feature-card { background:rgba(255,255,255,.82); border:1px solid var(--line); border-radius:17px; padding:17px; box-shadow:0 12px 38px rgba(25,74,57,.045); }
.feature-card .feature-icon { width:38px; height:38px; border-radius:12px; display:grid; place-items:center; background:var(--primary-soft); color:var(--primary); font-size:12px; font-weight:850; }
.feature-card h3 { margin:13px 0 5px; font-size:14px; }
.feature-card p { margin:0; color:var(--muted); font-size:11px; line-height:1.65; }
.steps { display:grid; grid-template-columns:repeat(4,1fr); gap:14px; }
.step { border:1px solid var(--line); border-radius:16px; padding:18px; background:#fff; }
.step-num { display:inline-grid; place-items:center; width:32px; height:32px; border-radius:10px; background:var(--primary-soft); color:var(--primary-strong); font-weight:850; font-size:12px; }
.step h3 { margin:14px 0 6px; font-size:15px; }
.step p { margin:0; color:var(--muted); font-size:12px; line-height:1.75; }
.section-block.faq { background:rgba(255,255,255,.82); border:1px solid var(--line); border-radius:22px; box-shadow:0 12px 38px rgba(25,74,57,.045); padding:28px; }
.section-block.faq details { border-top:1px solid var(--line); padding:15px 2px; }
.section-block.faq details:last-child { border-bottom:1px solid var(--line); }
.section-block.faq summary { cursor:pointer; font-weight:750; font-size:14px; list-style:none; position:relative; padding-right:28px; }
.section-block.faq summary::-webkit-details-marker { display:none; }
.section-block.faq summary::after { content:"+"; position:absolute; right:4px; top:50%; transform:translateY(-50%); font-size:20px; color:#6d887e; font-weight:400; }
.section-block.faq details[open] summary::after { content:"−"; }
.section-block.faq details p { margin:9px 0 0; color:var(--muted); font-size:12px; line-height:1.75; }

@media (max-width:1020px) {
  .feature-grid { grid-template-columns:repeat(2,1fr); }
  .steps { grid-template-columns:repeat(2,1fr); }
}
@media (max-width:760px) {
  .feature-grid { grid-template-columns:1fr; gap:9px; }
  .section-block.faq { padding:20px 16px; }
}
@media (max-width:480px) {
  .steps { grid-template-columns:1fr; }
}

/* 2026-08-21 上传入口稳定性修复：原生 file input + label，不依赖 JS 才能打开文件选择器。 */
.native-file-input {
  position:absolute !important;
  width:1px !important;
  height:1px !important;
  padding:0 !important;
  margin:-1px !important;
  overflow:hidden !important;
  clip:rect(0,0,0,0) !important;
  white-space:nowrap !important;
  border:0 !important;
}
label.choose-btn { display:inline-flex; align-items:center; justify-content:center; cursor:pointer; user-select:none; }
.core-load-warning {
  margin:16px auto 0; max-width:720px; padding:12px 14px; border:1px solid #f1c8c3; border-radius:12px;
  background:#fff7f6; color:#8a3028; text-align:left; font-size:12px; line-height:1.65;
}
.core-load-warning strong,.core-load-warning span { display:block; }
.core-load-warning strong { margin-bottom:2px; font-size:13px; }