:root{
  --bg:#f6f7fb;
  --card:#ffffff;
  --text:#1b2430;
  --muted:#697586;
  --line:#e4e8f0;
  --brand:#2f6df6;
  --brand-dark:#2059d4;
  --ok:#0f9d58;
  --warn:#c77700;
  --radius:14px;
  --shadow:0 2px 10px rgba(24,39,75,.06);
}
*{box-sizing:border-box}
/* 全局兜底：任何元素带 hidden 属性就一定不显示。
   修复：.modal{display:flex} 等作者样式会盖过浏览器默认的 [hidden]{display:none}，
   导致弹层/区块关不掉（黑色遮罩卡在页面上）。2026-09-25 */
[hidden]{display:none !important}
html,body{margin:0;padding:0}
body.no-scroll{overflow:hidden}
body{
  background:var(--bg);color:var(--text);
  font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-text-size-adjust:100%;
}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}

/* 头部 */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.header-inner{padding:12px 16px}
.brand{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.logo{font-size:26px;line-height:1}
h1{font-size:19px;margin:0}
.sub{margin:2px 0 0;color:var(--muted);font-size:12.5px}
.badge-live{margin-left:auto;font-size:12.5px;color:var(--ok);background:#e9f7ee;border:1px solid #cbe9d8;padding:4px 10px;border-radius:99px}
.badge-live b{font-size:13.5px}

/* 第一屏价值感 */
.hero{text-align:center;padding:26px 8px 6px}
.hero-title{font-size:26px;line-height:1.35;margin:0 0 10px;letter-spacing:.2px}
.hl{color:var(--ok);white-space:nowrap}
.hero-sub{color:var(--muted);margin:0 auto 14px;max-width:640px}
.trust{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}
.pill{font-size:12.5px;color:#41506b;background:#fff;border:1px solid var(--line);border-radius:99px;padding:5px 12px;box-shadow:var(--shadow)}
.pill.ok{color:var(--ok);border-color:#cbe9d8;background:#eefaf3;font-weight:600}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;margin:16px 0}

/* 上传区 */
.dropzone{
  border:2px dashed #c9d3e4;border-radius:var(--radius);padding:30px 16px;text-align:center;
  background:#fbfcff;transition:.18s border-color,.18s background;cursor:pointer;
}
.dropzone.over{border-color:var(--brand);background:#eef4ff}
.dz-icon{font-size:30px}
.dz-title{font-weight:600;margin:6px 0 4px}
.dz-hint{color:var(--muted);font-size:13px;margin-bottom:14px}

/* 按钮（移动端可点面积 ≥44px） */
.btn{
  appearance:none;border:1px solid var(--line);background:#fff;color:var(--text);
  padding:10px 16px;min-height:42px;border-radius:10px;font-size:14px;cursor:pointer;transition:.15s;
}
.btn.lg{padding:12px 22px;min-height:46px;font-size:15px}
.btn:hover{border-color:#c9d3e4;background:#fafbff}
.btn:active{transform:translateY(1px)}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600}
.btn.primary:hover{background:var(--brand-dark)}
.btn.ghost{border-color:transparent;background:transparent;color:var(--muted);min-height:36px;padding:6px 10px}
.btn.ghost:hover{color:var(--text);background:#f1f4fa}
.btn[disabled]{opacity:.55;cursor:not-allowed}

/* 设置区 */
.settings-card{position:sticky;top:64px;z-index:15}
.mode-tabs{display:flex;gap:8px;margin-bottom:14px;flex-wrap:wrap}
.mode-tab{
  flex:1;min-width:150px;min-height:42px;border:1px solid var(--line);background:#f7f9fc;color:#41506b;
  border-radius:10px;font-size:14px;font-weight:600;cursor:pointer;transition:.15s;
}
.mode-tab.active{background:var(--brand);border-color:var(--brand);color:#fff;box-shadow:0 2px 8px rgba(47,109,246,.25)}
.settings-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.field{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--muted)}
.field-wide{grid-column:span 2}
.field span{font-weight:600;color:#41506b}
.field .hint{font-weight:400;color:var(--muted);font-size:12px}
.field input[type=number],.field select{
  padding:10px;border:1px solid var(--line);border-radius:10px;font-size:14px;background:#fff;color:var(--text);
  width:100%;min-width:0;min-height:42px;
}
.field input[type=range]{width:100%;height:28px}
.field-quality b{color:var(--brand)}
.modal-mask{position:absolute;inset:0;background:rgba(15,23,42,.72);cursor:pointer}
.toggles{justify-content:flex-end}
.switch{display:flex;align-items:center;gap:8px;font-weight:600;color:#41506b;cursor:pointer;min-height:32px}
.switch input{width:18px;height:18px}
.switch.inline{margin-top:6px;font-size:12.5px;font-weight:500}

/* 压缩到指定大小 */
.target-box{border:1px solid #dbe6ff;background:#f6f9ff;border-radius:12px;padding:12px}
.target-row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.target-row input[type=number]{width:110px;flex:0 0 auto}
.target-row select{width:82px;flex:0 0 auto}
.quick-targets{display:flex;gap:6px;flex-wrap:wrap}
.chip{border:1px solid #c9d9ff;background:#fff;color:var(--brand);border-radius:99px;padding:6px 12px;font-size:12.5px;cursor:pointer;min-height:34px}
.chip:hover{background:#eef4ff}

.settings-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.tip{margin:12px 0 0;font-size:13px;color:var(--warn);background:#fff8e8;border:1px solid #ffe6b0;padding:8px 10px;border-radius:10px}
.progress-wrap{margin-top:14px}
.progress{height:8px;background:#eef1f7;border-radius:99px;overflow:hidden}
.progress-bar{height:100%;width:0;background:var(--brand);transition:width .2s}
.progress-text{font-size:12.5px;color:var(--muted);margin-top:6px}

/* 结果卡片 */
.results{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:14px}
.item{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column}
.item-head{display:flex;align-items:flex-start;gap:8px;padding:12px 14px 6px}
.item-title{font-weight:600;font-size:14px;word-break:break-all;flex:1}
.badge{font-size:11px;padding:2px 8px;border-radius:99px;background:#eef3ff;color:var(--brand);white-space:nowrap}
.badge.ok{background:#e9f7ee;color:var(--ok)}
.badge.warn{background:#fff4e5;color:var(--warn)}
.badge.err{background:#fdecec;color:#c62828}
.panes{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:6px 14px 0}
.pane{background:#f7f9fc;border:1px solid var(--line);border-radius:10px;padding:8px;text-align:center}
.pane .pane-label{font-size:11.5px;color:var(--muted);margin-bottom:6px}
.pane img{max-width:100%;max-height:150px;display:block;margin:0 auto;border-radius:6px;cursor:zoom-in;background:
  linear-gradient(45deg,#eceff5 25%,transparent 25%,transparent 75%,#eceff5 75%) 0 0/16px 16px,
  linear-gradient(45deg,#eceff5 25%,transparent 25%,transparent 75%,#eceff5 75%) 8px 8px/16px 16px}
.placeholder{padding:26px 0;color:#8794a8;font-size:12.5px}
.item-meta{padding:10px 14px;font-size:13px;color:var(--muted);display:flex;flex-direction:column;gap:5px}
.item-meta b{color:var(--text)}
.size-line .arrow{color:#b7c0cf}
.saving{color:var(--ok);font-weight:700;margin-left:6px}
.saving.neg{color:#c62828}
.err-line{color:#c62828}
.muted-inline{color:var(--muted);font-size:12px}
.lnk{color:var(--brand);cursor:pointer;margin-left:8px}
.lnk:hover{text-decoration:underline}
.item-actions{display:flex;gap:8px;padding:0 14px 14px;margin-top:auto}
.item-actions .btn{flex:1;text-align:center}

/* SEO / 教程区 */
.seo-card h2{font-size:16.5px;margin:0 0 8px}
.seo-card h2:not(:first-child){margin-top:20px}
.steps{margin:0 0 4px 18px;padding:0}
.steps li{margin:6px 0}
.seo-card details{border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin:8px 0;background:#fbfcff}
.seo-card summary{cursor:pointer;font-weight:600;color:#41506b}
.seo-card details p{margin:8px 0 0;color:var(--muted);font-size:13.5px}
/* 首页精简：FAQ 折叠，保持界面清爽 */
.seo-card .faq-lead{margin:0 0 6px;color:var(--muted);font-size:13.5px}
.seo-card details.faq{border:1px solid var(--line);border-radius:12px;padding:0;margin:8px 0;background:#fff;overflow:hidden}
.seo-card details.faq>summary{padding:12px 14px;cursor:pointer;font-weight:600;color:#41506b;list-style:none}
.seo-card details.faq>summary::-webkit-details-marker{display:none}
.seo-card details.faq>summary::after{content:"展开";float:right;color:var(--brand);font-weight:500;font-size:12.5px}
.seo-card details.faq[open]>summary::after{content:"收起"}
.seo-card details.faq .faq-body{padding:0 14px 12px}
.seo-card details.item-q{border:0;border-top:1px solid var(--line);border-radius:0;padding:10px 0;margin:0;background:transparent}
.seo-card details.item-q:first-of-type{border-top:0}
.seo-card details.item-q summary{font-weight:600;color:#41506b;cursor:pointer}
.seo-card details.item-q p{margin:8px 0 0;color:var(--muted);font-size:13.5px}

/* 放大对比弹窗：默认 display:none，用 .is-open 控制显示（方式A）；同时 JS 同步 hidden 属性 */
.modal{position:fixed;inset:0;z-index:60;display:none;align-items:center;justify-content:center;padding:16px}
.modal.is-open{display:flex}
.modal-body{position:relative;background:#fff;border-radius:14px;max-width:900px;width:100%;max-height:92vh;overflow:auto;padding:14px}
.modal-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}
.modal-head b{font-size:14px;word-break:break-all}
.compare{position:relative;width:100%;background:#f2f5fa;border-radius:10px;overflow:hidden;user-select:none;
  background-image:linear-gradient(45deg,#e9edf4 25%,transparent 25%,transparent 75%,#e9edf4 75%),linear-gradient(45deg,#e9edf4 25%,transparent 25%,transparent 75%,#e9edf4 75%);
  background-size:18px 18px;background-position:0 0,9px 9px}
.compare img{display:block;width:100%;height:auto;max-height:64vh;object-fit:contain}
.compare #cmpAfter{position:absolute;top:0;left:0;width:100%;height:100%}
.cmp-line{position:absolute;top:0;bottom:0;width:2px;background:#fff;box-shadow:0 0 0 1px rgba(0,0,0,.15);pointer-events:none}
.modal-body input[type=range]{width:100%;margin:12px 0 6px;height:28px}
.modal-meta{font-size:13px;color:var(--muted);line-height:1.7}
.modal-meta b{color:var(--text)}

.site-footer{border-top:1px solid var(--line);background:#fff;margin-top:24px;padding:18px 0;color:var(--muted);font-size:13px}
.site-footer .wrap{display:flex;gap:8px;align-items:center;flex-wrap:wrap}

/* 移动端打磨：更大的点击区、更粗的滑块、单列布局 */
@media (max-width:640px){
  .header-inner{padding:10px 14px}
  h1{font-size:17px}
  .badge-live{margin-left:0;order:3;width:100%;text-align:center}
  .hero{padding:18px 4px 2px}
  .hero-title{font-size:20px}
  .hero-sub{font-size:13.5px}
  .pill{font-size:12px;padding:5px 10px}
  .card{padding:14px;margin:12px 0}
  .settings-card{position:static}
  .settings-grid{grid-template-columns:1fr 1fr}
  .field-wide{grid-column:1 / -1}
  .field-quality,.toggles{grid-column:1 / -1}
  .toggles{flex-direction:row;gap:16px}
  .results{grid-template-columns:1fr}
  .settings-actions{gap:8px}
  .settings-actions .btn{flex:1 1 calc(50% - 4px)}
  .settings-actions .btn.primary{flex:1 1 100%}
  .dropzone{padding:22px 12px}
  .item-actions{gap:6px}
  .item-actions .btn{padding:10px 8px;font-size:13.5px}
  .modal{padding:8px}
  .modal-body{padding:12px;max-height:94vh}
  .mode-tab{min-width:0;font-size:13.5px}
  .pane img{max-height:120px}
}