:root{
  --bg:#f4f6f9;--card:#fff;--ink:#1c2230;--ink-soft:#4b5566;--faint:#8a94a6;--line:#e1e6ee;
  --blue:#1f4e9c;--blue-deep:#173d7a;--blue-wash:#e8f0fb;--gold:#b8933a;--danger:#b23a3a;--ok:#1e7d4f;
  --serif:"Noto Serif TC",serif;--sans:"Noto Sans TC","PingFang TC",system-ui,sans-serif;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.7}
a{color:var(--blue);text-decoration:none}
button{font-family:inherit;font-size:inherit}
.sr{position:absolute;left:-9999px}
.muted{color:var(--ink-soft)}
.fine{color:var(--faint);font-size:13px;margin:8px 0 0}
.err{color:var(--danger);font-size:14px;margin:10px 0 0}
code{background:#eef1f6;padding:2px 6px;border-radius:6px;font-size:13px}

/* 按鈕 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border-radius:10px;padding:9px 16px;font-weight:600;border:1.5px solid transparent;cursor:pointer;transition:.18s;white-space:nowrap}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn-pri{background:var(--blue);color:#fff}
.btn-pri:not(:disabled):hover{background:var(--blue-deep)}
.btn-ghost{background:#fff;color:var(--blue);border-color:var(--blue)}
.btn-ghost:hover{background:var(--blue-wash)}
.btn-text{background:transparent;color:var(--blue);padding:6px 10px}
.btn-text:hover{background:var(--blue-wash)}
.btn-text.danger{color:var(--danger)}
.btn-text.danger:hover{background:#fbeaea}

/* 登入 */
.login{min-height:100vh;display:grid;place-items:center;padding:24px}
.login-card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:36px 32px;width:min(420px,100%);box-shadow:0 24px 60px -36px rgba(20,30,60,.35)}
.brand{font-weight:700;font-size:18px;letter-spacing:.02em}
.brand span{color:var(--blue);margin-left:8px;font-weight:500}
.login-card p{margin:10px 0 20px}
.login-card form{display:grid;gap:14px}
.login-card label{display:grid;gap:6px;font-weight:600;font-size:14px}
.login-card input{padding:11px 12px;border:1.5px solid var(--line);border-radius:10px;font-size:15px}
.login-card input:focus{outline:none;border-color:var(--blue)}
.pw-wrap{position:relative;display:block}
.pw-wrap input{width:100%;padding-right:64px}
.pw-eye{position:absolute;right:6px;top:50%;transform:translateY(-50%);border:0;background:var(--blue-wash);color:var(--blue);font-size:13px;font-weight:600;padding:6px 10px;border-radius:8px;cursor:pointer}
.login-card label.remember{display:flex;align-items:center;gap:8px;font-weight:500;font-size:14px;color:var(--ink-soft)}
.login-card label.remember input{width:18px;height:18px;accent-color:var(--blue);padding:0}
#bioUnlock{width:100%;padding:14px;font-size:16px;margin-top:8px}

/* 版面 */
.app{min-height:100vh;display:flex;flex-direction:column}
.topbar{position:sticky;top:0;z-index:5;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:18px;padding:12px 20px;flex-wrap:wrap}
.site-switch{display:flex;align-items:center;gap:10px}
.site-switch select{padding:8px 12px;border:1.5px solid var(--line);border-radius:10px;font-size:15px;background:#fff}
.topbar-right{margin-left:auto;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.status{font-size:13px;color:var(--faint)}
.status.dirty{color:var(--gold);font-weight:600}
.status.saved{color:var(--ok);font-weight:600}
.layout{display:grid;grid-template-columns:200px minmax(0,1fr) 440px;gap:0;flex:1;align-items:start}
.sidenav{position:sticky;top:64px;padding:20px 12px;display:flex;flex-direction:column;gap:2px}
.sidenav a{padding:8px 12px;border-radius:8px;color:var(--ink-soft);font-size:14px}
.sidenav a:hover{background:var(--blue-wash);color:var(--blue)}
.editor{padding:20px 24px 80px;display:grid;gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px 24px;scroll-margin-top:80px}
.card h2{margin:0;font-size:18px}
.hint{color:var(--ink-soft);font-size:13.5px;margin:6px 0 0}
.fields{display:grid;gap:14px;margin-top:16px}
.field{display:grid;gap:6px}
.field .lbl{font-weight:600;font-size:13.5px;color:var(--ink-soft)}
.field input[type=text],.field input[type=url],.field textarea{padding:10px 12px;border:1.5px solid var(--line);border-radius:10px;font-size:15px;font-family:inherit;width:100%;background:#fff}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--blue)}
.field .ro{background:#f3f5f8;color:var(--faint)}
.field.toggle{grid-template-columns:auto 1fr;align-items:center;gap:10px}
.field.toggle input{width:20px;height:20px;accent-color:var(--blue)}
.field.toggle .lbl{font-size:15px;color:var(--ink)}
.imgbox{display:grid;gap:8px}
.imgbox img{max-width:260px;border-radius:12px;border:1px solid var(--line)}
.sub{border-left:3px solid var(--blue-wash);padding-left:14px;margin-top:4px}
.sub h3{margin:0 0 8px;font-size:15px;color:var(--blue)}
.list{display:grid;gap:12px}
.item{border:1px solid var(--line);border-radius:12px;padding:14px 16px;background:#fbfcfe}
.item-head{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap}
.item-tools{display:flex;gap:2px}
.item .fields{margin-top:10px}
.add{justify-self:start}

/* 預覽 */
.preview{position:sticky;top:64px;padding:20px 20px 20px 0;height:calc(100vh - 64px);display:flex;flex-direction:column}
.preview-head{display:flex;align-items:center;gap:12px;font-size:13.5px;color:var(--ink-soft);margin-bottom:10px}
.seg{display:inline-flex;border:1.5px solid var(--line);border-radius:8px;overflow:hidden}
.seg button{border:0;background:#fff;padding:4px 10px;cursor:pointer;color:var(--ink-soft)}
.seg button.on{background:var(--blue);color:#fff}
.preview-frame{flex:1;overflow:auto;background:#e9edf3;border:1px solid var(--line);border-radius:14px;display:flex;justify-content:center;padding:12px}
.preview-frame iframe{height:100%;min-height:600px;border:0;background:#fff;border-radius:10px;box-shadow:0 10px 30px -18px rgba(0,0,0,.4);flex:none}

/* 超管 */
.admin-panel{margin:0 24px 60px 200px;background:var(--card);border:1px dashed var(--gold);border-radius:16px;padding:20px 24px}
.admin-panel h2{margin:0 0 6px;font-size:16px;color:var(--gold)}
.admin-panel table{width:100%;border-collapse:collapse;margin-top:12px;font-size:14px}
.admin-panel th,.admin-panel td{text-align:left;padding:8px 6px;border-bottom:1px solid var(--line)}

/* 歷史 */
dialog{border:0;border-radius:16px;padding:24px;width:min(520px,92vw);box-shadow:0 30px 80px -30px rgba(0,0,0,.5)}
dialog::backdrop{background:rgba(20,30,60,.35)}
dialog h3{margin:0 0 6px}
#historyList{list-style:none;padding:0;margin:12px 0;max-height:50vh;overflow:auto;display:grid;gap:6px}
#historyList li{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:6px 0;border-bottom:1px solid var(--line);font-size:14px}

@media(max-width:1180px){
  .layout{grid-template-columns:1fr}
  .sidenav{position:static;flex-direction:row;flex-wrap:wrap;padding:12px 16px 0}
  .preview{position:static;height:auto;padding:0 16px 24px}
  .preview-frame iframe{min-height:520px;width:100%!important;max-width:390px}
  .admin-panel{margin:0 16px 40px}
}
@media(max-width:600px){
  .editor{padding:12px 12px 60px}
  .card{padding:16px}
  .topbar{padding:10px 12px}
}