:root {
  --bg: #0d1017;
  --bg-soft: #141926;
  --card: #161c2b;
  --card-2: #1b2334;
  --line: #283248;
  --ink: #eef2fb;
  --ink-dim: #aab4cc;
  --ink-faint: #6f7b96;
  --accent: #6ea8fe;
  --accent-2: #9d7bff;
  --good: #4fd1a1;
  --warn: #ffb454;
  --danger: #ff7a8a;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --maxw: 980px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: radial-gradient(1200px 600px at 20% -10%, #1b2540 0%, transparent 55%), var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 18px; }

/* Topbar */
.topbar { border-bottom: 1px solid var(--line); background: rgba(13,16,23,.7); backdrop-filter: blur(8px); position: sticky; top: 0; z-index: 10; }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 11px; }
.logo { font-size: 26px; }
.brand-name { font-weight: 700; font-size: 16px; letter-spacing: .2px; }
.brand-sub { font-size: 11px; color: var(--ink-faint); letter-spacing: .5px; }
.ghost-link { color: var(--ink-dim); text-decoration: none; font-size: 14px; padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; }
.ghost-link:hover { color: var(--ink); border-color: var(--accent); }

/* Hero */
.hero { padding: 46px 0 26px; }
.hero h1 { font-size: clamp(26px, 5vw, 40px); line-height: 1.18; margin: 0 0 14px; letter-spacing: -.5px; }
.hl { background: linear-gradient(90deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lede { font-size: clamp(15px, 2.4vw, 17px); color: var(--ink-dim); max-width: 760px; margin: 0; }
.lede strong { color: var(--ink); font-weight: 600; }

/* Card */
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }

/* Composer */
.composer { padding: 22px; }
.field-label { display: block; font-size: 13px; color: var(--ink-dim); margin-bottom: 8px; font-weight: 600; }
.req { color: var(--danger); }
textarea {
  width: 100%; resize: vertical; background: var(--bg-soft); color: var(--ink);
  border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px;
  font-size: 15px; font-family: inherit; line-height: 1.55;
}
textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(110,168,254,.16); }
textarea::placeholder { color: var(--ink-faint); }

.facts-wrap { margin-top: 12px; }
.facts-wrap summary { cursor: pointer; font-size: 13px; color: var(--accent); list-style: none; padding: 6px 0; user-select: none; }
.facts-wrap summary::-webkit-details-marker { display: none; }
.facts-wrap[open] summary { color: var(--ink-dim); }
.facts-wrap textarea { margin-top: 8px; }

.controls { display: flex; align-items: center; gap: 14px; margin-top: 16px; flex-wrap: wrap; }
.seg { display: inline-flex; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 999px; padding: 3px; gap: 2px; }
.seg-btn { border: none; background: transparent; color: var(--ink-dim); padding: 7px 14px; border-radius: 999px; font-size: 13px; cursor: pointer; font-family: inherit; transition: .15s; }
.seg-btn:hover { color: var(--ink); }
.seg-btn.active { background: linear-gradient(90deg, var(--accent), var(--accent-2)); color: #0d1017; font-weight: 600; }

.primary {
  margin-left: auto; border: none; cursor: pointer;
  background: linear-gradient(90deg, var(--accent), var(--accent-2)); color: #0b0e16;
  font-weight: 700; font-size: 15px; padding: 12px 22px; border-radius: 10px; font-family: inherit;
  transition: transform .12s, filter .12s;
}
.primary:hover { filter: brightness(1.06); transform: translateY(-1px); }
.primary:active { transform: translateY(0); }

.examples { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.examples-label { font-size: 12px; color: var(--ink-faint); }
.chip { background: var(--card-2); border: 1px solid var(--line); color: var(--ink-dim); border-radius: 999px; padding: 6px 13px; font-size: 12.5px; cursor: pointer; font-family: inherit; }
.chip:hover { border-color: var(--accent); color: var(--ink); }

/* Results */
.results { margin-top: 26px; }
.results-bar { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; margin-bottom: 16px; }
.results-meta { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.badge { background: var(--card-2); border: 1px solid var(--line); border-radius: 999px; padding: 5px 13px; font-size: 13px; font-weight: 600; color: var(--accent); white-space: nowrap; }
.topic-echo { font-size: 13px; color: var(--ink-faint); max-width: 420px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.results-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.mini-toggle { font-size: 12.5px; color: var(--ink-dim); display: inline-flex; align-items: center; gap: 6px; cursor: pointer; user-select: none; }
.mini-toggle input { accent-color: var(--accent); }
.ghost { background: var(--card-2); border: 1px solid var(--line); color: var(--ink-dim); border-radius: 8px; padding: 7px 12px; font-size: 12.5px; cursor: pointer; font-family: inherit; }
.ghost:hover { border-color: var(--accent); color: var(--ink); }

.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.angle {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; display: flex; flex-direction: column; gap: 12px; position: relative;
  animation: rise .35s ease both;
}
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

.angle-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.angle-tag { font-size: 12px; font-weight: 700; color: var(--accent-2); letter-spacing: .3px; }
.angle-name { font-size: 16px; font-weight: 700; margin: 2px 0 0; }
.sharp { display: inline-flex; align-items: center; gap: 4px; font-size: 11px; color: var(--ink-faint); white-space: nowrap; }
.sharp .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--line); }
.sharp .dot.on { background: var(--good); }
.sharp.data .dot.on { background: var(--accent); }

.titles { display: flex; flex-direction: column; gap: 7px; }
.title-row { display: flex; gap: 9px; align-items: flex-start; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 9px; padding: 9px 11px; }
.plat { font-size: 10px; font-weight: 700; padding: 2px 7px; border-radius: 5px; white-space: nowrap; margin-top: 2px; flex-shrink: 0; }
.plat.wechat { background: rgba(79,209,161,.16); color: var(--good); }
.plat.xhs { background: rgba(255,122,138,.16); color: var(--danger); }
.plat.video { background: rgba(157,123,255,.18); color: var(--accent-2); }
.title-text { font-size: 14px; line-height: 1.5; cursor: pointer; flex: 1; }
.title-text:hover { color: var(--accent); }

.meta-grid { display: flex; flex-direction: column; gap: 8px; font-size: 13px; }
.meta-row { display: flex; gap: 8px; }
.meta-key { color: var(--ink-faint); flex-shrink: 0; width: 4.4em; }
.meta-val { color: var(--ink-dim); }
.risk .meta-key { color: var(--warn); }
.risk .meta-val { color: #e7c79a; }

/* How */
.how { padding: 26px; margin-top: 30px; }
.how h2 { margin: 0 0 16px; font-size: 20px; }
.how-list { margin: 0; padding-left: 20px; color: var(--ink-dim); display: flex; flex-direction: column; gap: 10px; font-size: 14.5px; }
.how-list strong { color: var(--ink); }
.privacy { margin: 18px 0 0; font-size: 13px; color: var(--ink-faint); background: var(--bg-soft); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.privacy code { background: var(--card-2); padding: 1px 5px; border-radius: 4px; color: var(--ink-dim); }

/* Footer */
.footer { border-top: 1px solid var(--line); margin-top: 44px; padding: 26px 0 40px; color: var(--ink-faint); font-size: 13px; }
.footer-sub { margin: 6px 0 0; color: #56607a; }

/* Toast */
.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%) translateY(20px);
  background: var(--good); color: #0a0d14; font-weight: 600; font-size: 13.5px;
  padding: 10px 20px; border-radius: 999px; opacity: 0; pointer-events: none;
  transition: opacity .2s, transform .2s; z-index: 50; box-shadow: var(--shadow);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 720px) {
  .cards { grid-template-columns: 1fr; }
  .hero { padding: 32px 0 18px; }
  .primary { margin-left: 0; width: 100%; }
  .controls { gap: 12px; }
  .seg { width: 100%; justify-content: space-between; }
  .seg-btn { flex: 1; padding: 8px 4px; }
  .results-bar { align-items: flex-start; }
  .topic-echo { max-width: 100%; white-space: normal; }
}