:root {
  --navy: #203888; --navy-d: #17286a; --gold: #B08040; --ink: #1c2233; --muted: #6b7385;
  --bg: #f4f5f8; --card: #ffffff; --line: #e1e4ec; --green: #1f8a4c; --red: #c62f3a; --blue: #2d64c8;
  --r: 8px;
  font-family: Montserrat, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink); background: var(--bg);
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); line-height: 1.5; }
a { color: var(--navy); }
h1 { font-size: 1.6rem; margin: 8px 0 16px; color: var(--navy-d); }
h2 { font-size: 1.1rem; margin: 0 0 12px; color: var(--navy-d); }
.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 16px; background: var(--navy); color: #fff; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; font-weight: 700; }
.logo { background: var(--gold); color: #fff; padding: 4px 8px; border-radius: 6px; letter-spacing: 1px; font-size: .85rem; }
.nav { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.nav a { color: #fff; text-decoration: none; font-weight: 600; font-size: .95rem; }
.nav a:hover { text-decoration: underline; }
.nav select { border-radius: 6px; padding: 4px 6px; border: 0; }
main { padding: 16px; margin: 0 auto; }
main.narrow { max-width: 880px; }
main.wide { max-width: 1240px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 20px; margin: 0 0 16px; }
.btn { display: inline-block; background: var(--navy); color: #fff; border: 0; border-radius: var(--r); padding: 12px 20px; font-weight: 700; font-size: 1rem; cursor: pointer; text-decoration: none; }
.btn:hover { background: var(--navy-d); }
.btn:disabled { opacity: .6; }
.btn.small { padding: 7px 14px; font-size: .9rem; }
.btn.ghost { background: transparent; color: var(--navy); border: 1.5px solid var(--navy); }
label { display: block; font-weight: 600; font-size: .92rem; margin: 0 0 12px; }
input, select, textarea { display: block; width: 100%; margin-top: 6px; padding: 11px 12px; border: 1.5px solid var(--line); border-radius: var(--r); font: inherit; background: #fff; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--gold); border-color: var(--gold); }
textarea { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: .9rem; }
label.inline { display: inline-flex; align-items: center; gap: 6px; margin-right: 16px; font-weight: 500; }
label.inline input { width: auto; margin: 0; }
fieldset { border: 1px solid var(--line); border-radius: var(--r); padding: 10px 14px; margin: 0 0 12px; }
legend { font-weight: 700; padding: 0 6px; }
.note { color: var(--muted); font-size: .92rem; }
.muted { color: var(--muted); font-size: .85rem; }
.msg { min-height: 1.2em; font-weight: 600; }
.msg.err, .up-msg.err, #msg { color: var(--red); }
.msg.ok, .up-msg.ok { color: var(--green); }
.empty { color: var(--muted); padding: 12px 0; }
.back { display: inline-block; margin: 4px 0 4px; text-decoration: none; font-weight: 600; }
code { background: #eef0f6; padding: 1px 5px; border-radius: 4px; }

/* login */
.login { max-width: 440px; margin: 40px auto; }
.langs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.chip { border: 1.5px solid var(--navy); background: #fff; color: var(--navy); border-radius: 999px; padding: 6px 12px; font-weight: 600; cursor: pointer; font: inherit; font-size: .88rem; }
.chip.on { background: var(--navy); color: #fff; }
.tabs { display: flex; gap: 8px; margin-bottom: 10px; }

/* viewer list */
.hello { color: var(--muted); margin-top: -10px; }
.vlist { display: grid; gap: 12px; }
.vcard { display: grid; grid-template-columns: 96px 1fr auto; gap: 16px; align-items: center; background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 12px; text-decoration: none; color: inherit; }
.vcard:hover { border-color: var(--gold); }
.vcard h2 { margin: 0 0 6px; font-size: 1.05rem; }
.thumb { width: 96px; height: 60px; border-radius: 6px; background: linear-gradient(135deg, var(--navy), #3a57b8); display: grid; place-items: center; color: #fff; font-size: 1.4rem; }
.badge { display: inline-block; font-size: .78rem; font-weight: 700; padding: 3px 8px; border-radius: 999px; margin-right: 6px; }
.badge.grey { background: #e7e9ef; color: #4a5164; } .badge.green { background: #dcf2e4; color: var(--green); }
.badge.blue { background: #e0e9fb; color: var(--blue); } .badge.gold { background: #f5ead9; color: #8a5f22; } .badge.red { background: #fbe2e4; color: var(--red); }
.dur { color: var(--muted); font-size: .85rem; }
@media (max-width: 560px) { .vcard { grid-template-columns: 64px 1fr; } .vcard .btn { grid-column: 1 / -1; text-align: center; } .thumb { width: 64px; height: 48px; } }

/* player */
.player { position: relative; background: #000; border-radius: var(--r); overflow: hidden; margin-bottom: 16px; user-select: none; -webkit-user-select: none; }
.player video { display: block; width: 100%; aspect-ratio: 16 / 9; background: #000; }
.player:fullscreen { display: flex; align-items: center; }
.player:fullscreen video { height: 100%; aspect-ratio: auto; }
.wm { position: absolute; pointer-events: none; color: rgba(255,255,255,.55); font-size: clamp(11px, 1.6vw, 18px); font-weight: 700; text-shadow: 0 0 3px rgba(0,0,0,.6); transition: left 1.2s ease, top 1.2s ease; white-space: nowrap; }
.toast { position: absolute; left: 50%; top: 12px; transform: translateX(-50%); background: rgba(176,128,64,.95); color: #fff; padding: 8px 14px; border-radius: 999px; font-weight: 700; opacity: 0; transition: opacity .2s; pointer-events: none; }
.toast.on { opacity: 1; }
.fs { position: absolute; right: 10px; top: 10px; background: rgba(0,0,0,.55); color: #fff; border: 0; border-radius: 6px; width: 40px; height: 40px; font-size: 20px; cursor: pointer; }
.quiz fieldset { margin-bottom: 14px; }
.opt { display: flex; gap: 10px; align-items: flex-start; font-weight: 500; padding: 8px 10px; border-radius: 6px; margin: 4px 0; cursor: pointer; }
.opt input { width: auto; margin: 4px 0 0; }
.opt.right { background: #dcf2e4; } .opt.wrong { background: #fbe2e4; }
.result { font-weight: 700; font-size: 1.05rem; } .result.ok { color: var(--green); } .result.no { color: var(--red); }

/* admin */
.filters { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; background: var(--card); border: 1px solid var(--line); border-radius: var(--r); padding: 12px 16px; margin-bottom: 16px; }
.filters label { margin: 0; min-width: 150px; }
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin-bottom: 16px; }
.kpi { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--gold); border-radius: var(--r); padding: 14px 16px; display: grid; gap: 2px; }
.kl { font-size: .82rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: .3px; }
.kv { font-size: 1.8rem; font-weight: 800; color: var(--navy-d); }
.ks { font-size: .82rem; color: var(--muted); }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th { text-align: left; color: var(--muted); font-weight: 700; font-size: .8rem; text-transform: uppercase; letter-spacing: .3px; border-bottom: 2px solid var(--line); padding: 8px; }
td { border-bottom: 1px solid var(--line); padding: 9px 8px; vertical-align: top; }
tr.inactive td { opacity: .5; }
.card { overflow-x: auto; }
.row { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 8px; }
.meter { display: inline-block; width: 120px; height: 8px; background: #e7e9ef; border-radius: 999px; vertical-align: middle; overflow: hidden; }
.meter span { display: block; height: 100%; background: var(--green); }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 0 20px; }
.upload { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.upload input { width: auto; margin: 0; }
.chart { width: 100%; height: auto; max-width: 900px; }
.chart .bar { fill: var(--navy); } .chart .axis { stroke: #b9bfcc; } .chart .grid { stroke: #eceef3; }
.chart .ax { fill: var(--muted); font-size: 11px; } .chart .line { fill: none; stroke: var(--navy); stroke-width: 2.5; }
.chart .area { fill: rgba(32,56,136,.12); } .chart .dot { fill: var(--red); } .chart .ann { fill: var(--red); font-size: 12px; font-weight: 700; }
.caption { color: var(--muted); font-size: .85rem; margin: 4px 0 0; }
.nav select { display: inline-block; width: auto; margin: 0; padding: 4px 6px; }
@media (max-width: 560px) { .top { padding: 10px 12px; } .nav { gap: 12px; } }