:root{
  --bg:#f6f7f9;
  --panel:#ffffff;
  --panel-2:#f0f2f5;
  --text:#15171a;
  --muted:#6f7680;
  --line:#e3e6ea;
  --accent:#111111;
  --good:#16794b;
  --warn:#b26b00;
  --danger:#b42318;
  --shadow:0 12px 30px rgba(20,24,32,.07);
  --radius:18px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
.app-shell{display:grid;grid-template-columns:250px 1fr;min-height:100vh}
.sidebar{background:#101214;color:#fff;padding:24px 18px;position:sticky;top:0;height:100vh}
.brand{font-size:24px;font-weight:800;letter-spacing:-.04em;margin-bottom:28px}
.brand small{display:block;font-size:11px;color:#8e959d;letter-spacing:.08em;text-transform:uppercase;margin-top:4px}
.nav{display:flex;flex-direction:column;gap:6px}
.nav a{color:#b9bec5;text-decoration:none;padding:11px 12px;border-radius:12px;font-size:14px}
.nav a:hover,.nav a.active{background:#1b1f23;color:#fff}
.nav-sep{height:1px;background:#262b31;margin:12px 0}
.sidebar-bottom{position:absolute;bottom:20px;left:18px;right:18px;color:#878e96;font-size:12px}
.main{padding:30px 34px 60px}
.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px}
.topbar h1{font-size:28px;letter-spacing:-.035em;margin:0}
.top-actions{display:flex;gap:10px;align-items:center}
.avatar{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:#ddd;font-weight:700}
.btn{border:1px solid var(--line);background:#fff;color:var(--text);padding:10px 14px;border-radius:12px;font-weight:650}
.btn:hover{transform:translateY(-1px)}
.btn.primary{background:#111;color:#fff;border-color:#111}
.btn.ghost{background:transparent}
.btn.good{background:#e9f7ef;color:var(--good);border-color:#cfe9da}
.btn.danger{background:#fff3f1;color:var(--danger);border-color:#f2c8c3}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.metric{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.metric .value{font-size:30px;font-weight:800;letter-spacing:-.04em}
.metric .label{font-size:13px;color:var(--muted);margin-top:4px}
.section{margin-top:28px}
.section-head{display:flex;align-items:end;justify-content:space-between;margin-bottom:12px}
.section-head h2{font-size:18px;margin:0}
.section-head p{margin:4px 0 0;color:var(--muted);font-size:13px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.episode-row{display:grid;grid-template-columns:70px 1.6fr 1fr auto;gap:18px;align-items:center;padding:16px 18px;border-bottom:1px solid var(--line)}
.episode-row:last-child{border-bottom:none}
.thumb{width:70px;height:52px;border-radius:10px;background:linear-gradient(135deg,#2b2f36,#6b7078);display:grid;place-items:center;color:#fff;font-size:22px}
.ep-title{font-weight:750}
.meta{font-size:12px;color:var(--muted);margin-top:5px}
.progress{height:7px;background:#eceef1;border-radius:999px;overflow:hidden;margin-top:8px}
.progress > span{display:block;height:100%;background:#111;border-radius:999px}
.badge{display:inline-flex;align-items:center;padding:6px 9px;border-radius:999px;background:#f0f2f5;font-size:12px;font-weight:650}
.badge.good{background:#e9f7ef;color:var(--good)}
.badge.warn{background:#fff4df;color:var(--warn)}
.page-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:18px}
.panel{padding:20px}
.panel h3{margin:0 0 14px;font-size:16px}
.field{margin-bottom:15px}
.field label{display:block;font-size:12px;font-weight:700;color:#4d535b;margin-bottom:7px}
.input, textarea, select{width:100%;border:1px solid var(--line);border-radius:12px;padding:11px 12px;background:#fff;outline:none}
.input:focus, textarea:focus, select:focus{border-color:#aaa}
.source-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.source-card{border:1px solid var(--line);border-radius:16px;padding:18px;background:#fff;text-align:left}
.source-card.active{border-color:#111;box-shadow:0 0 0 2px #111 inset}
.source-icon{font-size:26px;margin-bottom:10px}
.source-title{font-weight:750}
.source-desc{font-size:12px;color:var(--muted);margin-top:5px}
.divider{height:1px;background:var(--line);margin:18px 0}
.detail-head{display:flex;justify-content:space-between;gap:18px;align-items:flex-start}
.detail-title h2{margin:0;font-size:28px;letter-spacing:-.04em}
.tabs{display:flex;gap:8px;border-bottom:1px solid var(--line);margin-top:24px;overflow-x:auto}
.tabs button{border:0;background:none;padding:12px 10px;color:var(--muted);font-weight:650}
.tabs button.active{color:#111;border-bottom:2px solid #111}
.content-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:16px;margin-top:18px}
.video{aspect-ratio:16/9;background:linear-gradient(145deg,#151719,#3a3e44);border-radius:16px;display:grid;place-items:center;color:#fff;font-size:52px}
.transcript{max-height:500px;overflow:auto}
.segment{padding:12px 0;border-bottom:1px solid var(--line)}
.segment:last-child{border-bottom:none}
.seg-head{display:flex;justify-content:space-between;gap:10px;font-size:12px;color:var(--muted);margin-bottom:6px}
.seg-text{line-height:1.5}
.idea{padding:14px;border:1px solid var(--line);border-radius:14px;margin-bottom:10px}
.idea h4{margin:0 0 6px;font-size:14px}
.idea p{margin:0;color:#555c64;font-size:13px;line-height:1.45}
.idea-actions{display:flex;gap:8px;margin-top:12px}
.empty{padding:45px;text-align:center;color:var(--muted)}
.notice{background:#fff7e7;border:1px solid #f4dfb5;padding:13px 15px;border-radius:13px;color:#785000;font-size:13px}
.toast{position:fixed;right:20px;bottom:20px;background:#111;color:#fff;padding:12px 16px;border-radius:12px;box-shadow:var(--shadow);z-index:50}
@media(max-width:900px){
  .app-shell{grid-template-columns:1fr}
  .sidebar{position:relative;height:auto}
  .sidebar-bottom{display:none}
  .nav{flex-direction:row;overflow:auto}
  .main{padding:20px}
  .grid-4,.source-grid,.page-grid,.content-grid{grid-template-columns:1fr}
  .episode-row{grid-template-columns:56px 1fr;align-items:start}
  .episode-row > :nth-child(3),.episode-row > :nth-child(4){grid-column:2}
}