:root{
  --primary:#3f51b5;        /* Indigo (Android Material) */
  --primary-d:#303f9f;
  --primary-l:#e8eaf6;
  --accent:#00bcd4;
  --bg:#f5f6fa;
  --surface:#ffffff;
  --text:#1c1d22;
  --muted:#6b7280;
  --line:#e6e8ee;
  --ok:#2e7d32; --warn:#ed6c02; --err:#d32f2f;
  --radius:16px;
  --shadow:0 1px 2px rgba(0,0,0,.06),0 2px 8px rgba(0,0,0,.06);
  --shadow-2:0 4px 12px rgba(0,0,0,.12);
  --nav-w:248px; --bar-h:60px;
  font-family:"Roboto","HarmonyOS Sans","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

/* ---------- App bar ---------- */
.appbar{position:fixed;top:0;left:0;right:0;height:var(--bar-h);background:var(--primary);
  color:#fff;display:flex;align-items:center;gap:10px;padding:0 14px;z-index:40;box-shadow:var(--shadow-2)}
.brand{font-size:19px;font-weight:600;display:flex;align-items:center;gap:9px;letter-spacing:.3px}
.brand-dot{width:11px;height:11px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px rgba(0,188,212,.25)}
.spacer{flex:1}
.icon-btn{background:transparent;border:0;color:#fff;width:42px;height:42px;border-radius:50%;display:grid;place-items:center;cursor:pointer}
.icon-btn:active{background:rgba(255,255,255,.15)}
.menu-toggle{display:none}
.balance-chip{display:flex;align-items:center;gap:6px;background:rgba(255,255,255,.16);
  padding:7px 13px;border-radius:30px;font-size:14px;font-weight:500}
.balance-chip svg{width:18px;height:18px}
.avatar{width:38px;height:38px;border-radius:50%;background:var(--accent);color:#fff;
  display:grid;place-items:center;font-weight:600;margin-left:4px}

/* ---------- Side nav ---------- */
.sidenav{position:fixed;top:var(--bar-h);bottom:0;left:0;width:var(--nav-w);background:var(--surface);
  border-right:1px solid var(--line);overflow-y:auto;z-index:30;padding:12px 10px}
.sidenav nav{display:flex;flex-direction:column;gap:2px;height:100%}
.sidenav a{display:flex;align-items:center;gap:14px;padding:12px 16px;border-radius:30px;color:#3a3b42;
  font-size:14.5px;font-weight:500;transition:background .15s}
.sidenav a:hover{background:#f1f2f7}
.sidenav a.active{background:var(--primary-l);color:var(--primary-d)}
.nav-label{font-size:11px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.6px;padding:14px 16px 6px}
.nav-spacer{flex:1}
.scrim{display:none}
.nav-ic{width:22px;height:22px;flex:none;stroke-width:1.9}
.sidenav a .nav-ic{opacity:.85}
.sidenav a.active .nav-ic{opacity:1}

/* ---------- Content ---------- */
.content{margin-left:var(--nav-w);margin-top:var(--bar-h);padding:26px clamp(16px,4vw,40px);max-width:1280px}
h1.page{font-size:24px;font-weight:600;margin:2px 0 4px}
.subtitle{color:var(--muted);margin:0 0 22px;font-size:14px}

/* ---------- Cards ---------- */
.card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;margin-bottom:20px}
.card h2{font-size:17px;margin:0 0 16px;font-weight:600;display:flex;align-items:center;gap:8px}
.grid{display:grid;gap:18px}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.grid-4{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}

/* stat cards */
.stat{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 20px}
.stat .n{font-size:28px;font-weight:700;color:var(--primary-d)}
.stat .l{color:var(--muted);font-size:13px;margin-top:4px}

/* ---------- Forms ---------- */
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px;font-weight:500}
input,select,textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:12px;
  font-size:14.5px;background:#fbfbfd;font-family:inherit;transition:border .15s,box-shadow .15s;color:var(--text)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-l);background:#fff}
textarea{resize:vertical;min-height:90px}
.row{display:flex;gap:12px;flex-wrap:wrap}
.row>*{flex:1;min-width:160px}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;border-radius:30px;
  font-size:14px;font-weight:600;border:0;cursor:pointer;transition:.15s;letter-spacing:.3px;font-family:inherit}
.btn-filled{background:var(--primary);color:#fff;box-shadow:var(--shadow)}
.btn-filled:hover{background:var(--primary-d);box-shadow:var(--shadow-2)}
.btn-text{background:transparent;color:var(--primary-d)}
.btn-text:hover{background:var(--primary-l)}
.btn-tonal{background:var(--primary-l);color:var(--primary-d)}
.btn-tonal:hover{background:#d6dafc}
.btn-danger{background:#fdeaea;color:var(--err)}
.btn-danger:hover{background:#f9d5d5}
.btn-sm{padding:7px 14px;font-size:13px}
.btn-block{width:100%}

/* ---------- Table ---------- */
.table-wrap{overflow-x:auto;border-radius:var(--radius)}
table{width:100%;border-collapse:collapse;font-size:14px;background:var(--surface)}
th,td{text-align:left;padding:13px 14px;border-bottom:1px solid var(--line);white-space:nowrap}
th{font-size:12px;text-transform:uppercase;letter-spacing:.5px;color:var(--muted);font-weight:600;background:#fafbfd}
tr:last-child td{border-bottom:0}
tbody tr:hover{background:#fafbff}

/* chips/badges */
.badge{display:inline-block;padding:3px 10px;border-radius:20px;font-size:12px;font-weight:600}
.badge-ok{background:#e7f4e8;color:var(--ok)}
.badge-off{background:#fdeaea;color:var(--err)}
.badge-info{background:var(--primary-l);color:var(--primary-d)}
.badge-accent{background:#e0f7fa;color:#00838f}
.tag{display:inline-block;background:#eef0f6;color:#4b5563;border-radius:8px;padding:3px 9px;font-size:12px;margin:2px}
.mono{font-family:"JetBrains Mono","SFMono-Regular",Consolas,monospace;font-size:13px}

/* type pill */
.pill-image{background:#e8f0fe;color:#1a56db}
.pill-video{background:#fce8f3;color:#9b1c5c}
.pill-chat{background:#e6f4ea;color:#137333}

/* ---------- Auth ---------- */
.auth-wrap{min-height:calc(100vh - var(--bar-h));display:grid;place-items:center;padding:20px;margin-left:0!important}
.auth-card{background:var(--surface);border-radius:24px;box-shadow:var(--shadow-2);padding:36px 32px;width:100%;max-width:400px}
.auth-card h1{font-size:23px;margin:0 0 6px;text-align:center}
.auth-card .sub{text-align:center;color:var(--muted);margin:0 0 26px;font-size:14px}
.auth-logo{width:64px;height:64px;border-radius:20px;background:linear-gradient(135deg,var(--primary),var(--accent));
  margin:0 auto 18px;display:grid;place-items:center;color:#fff;font-size:30px;font-weight:700;box-shadow:var(--shadow-2)}
.auth-foot{text-align:center;margin-top:18px;font-size:14px;color:var(--muted)}
.auth-foot a{color:var(--primary-d);font-weight:600}

/* ---------- Snackbar/flash ---------- */
.snackbar{background:#323232;color:#fff;padding:14px 18px;border-radius:12px;margin-bottom:18px;
  font-size:14px;box-shadow:var(--shadow-2);animation:slideup .3s}
@keyframes slideup{from{transform:translateY(12px);opacity:0}to{transform:none;opacity:1}}
.alert{padding:13px 16px;border-radius:12px;font-size:14px;margin-bottom:16px}
.alert-err{background:#fdeaea;color:var(--err)}
.alert-ok{background:#e7f4e8;color:var(--ok)}

/* ---------- Hero ---------- */
.hero{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;border-radius:24px;
  padding:48px 40px;margin-bottom:24px;box-shadow:var(--shadow-2)}
.hero h1{font-size:34px;margin:0 0 12px;font-weight:700}
.hero p{font-size:16px;opacity:.92;margin:0 0 24px;max-width:560px;line-height:1.6}
.hero .btn-filled{background:#fff;color:var(--primary-d)}
.hero .btn-text{color:#fff;border:1px solid rgba(255,255,255,.5)}

.feature{display:flex;gap:14px;align-items:flex-start}
.feature .fi{width:44px;height:44px;border-radius:12px;background:var(--primary-l);color:var(--primary-d);
  display:grid;place-items:center;flex:none}
.feature h3{margin:0 0 4px;font-size:15px}
.feature p{margin:0;color:var(--muted);font-size:13.5px;line-height:1.5}

.help{font-size:12.5px;color:var(--muted);margin-top:6px}
.divider{height:1px;background:var(--line);margin:18px 0}
.flex-between{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.code-key{background:#f3f4f8;border:1px solid var(--line);border-radius:10px;padding:8px 12px;font-size:13px;
  display:flex;align-items:center;gap:10px;justify-content:space-between}
.copy-btn{cursor:pointer;color:var(--primary-d);font-weight:600;font-size:13px;background:0;border:0}
.result-media img,.result-media video{max-width:100%;border-radius:12px;box-shadow:var(--shadow)}
.checks{display:flex;gap:14px;flex-wrap:wrap}
.checks label{display:flex;align-items:center;gap:7px;background:#f3f4f8;padding:8px 14px;border-radius:30px;cursor:pointer;font-weight:500;color:#374151}
.checks input{width:auto}
pre.codeblock{background:#1e1e2e;color:#e4e4ef;padding:16px;border-radius:12px;overflow-x:auto;font-size:13px;line-height:1.6}
.spinner{width:18px;height:18px;border:2px solid rgba(255,255,255,.4);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite;display:inline-block}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- Responsive ---------- */
@media(max-width:900px){
  .menu-toggle{display:grid}
  .sidenav{transform:translateX(-100%);transition:transform .25s;box-shadow:var(--shadow-2)}
  body.nav-open .sidenav{transform:none}
  body.nav-open .scrim{display:block;position:fixed;inset:var(--bar-h) 0 0 0;background:rgba(0,0,0,.4);z-index:25}
  .content{margin-left:0}
  .balance-chip{display:none}
}