:root {
  --bg: #06090f;
  --bg2: #0a1020;
  --surface: #0f1626;
  --surface2: #141d31;
  --line: rgba(148, 173, 219, 0.14);
  --text: #e9effb;
  --dim: #8d9dbd;
  --accent: #4fd1ff;
  --ok: #3ed598;
  --warn: #ffb020;
  --grad: linear-gradient(118deg, #f9b03a 0%, #ec5c9c 36%, #7c5cff 70%, #4fc3f7 100%);
  --radius: 18px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }

.wrap { width: min(1180px, 92vw); margin: 0 auto; }

/* ---------------------------------------------------------------- 顶栏 */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: rgba(6, 9, 15, 0.76);
  border-bottom: 1px solid var(--line);
}

.nav-in {
  height: 72px;
  display: flex;
  align-items: center;
  gap: 34px;
}

.brand { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 17px; letter-spacing: .3px; }
.brand img { width: 34px; height: 34px; }
.brand small { display: block; font-size: 11px; font-weight: 500; color: var(--dim); letter-spacing: 1.4px; }

.nav-links { display: flex; gap: 28px; margin-left: auto; font-size: 14.5px; color: var(--dim); }
.nav-links a:hover { color: var(--text); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 42px;
  padding: 0 20px;
  border-radius: 10px;
  font-size: 14.5px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .18s, box-shadow .18s, background .18s;
  white-space: nowrap;
}

.btn-primary { background: var(--grad); color: #0a0f1c; box-shadow: 0 8px 26px rgba(124, 92, 255, .28); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 12px 32px rgba(124, 92, 255, .4); }
.btn-ghost { border-color: var(--line); color: var(--text); background: rgba(255,255,255,.03); }
.btn-ghost:hover { background: rgba(255,255,255,.07); }

/* ---------------------------------------------------------------- 首屏 */
.hero { position: relative; padding: 84px 0 70px; overflow: hidden; }
.hero::before {
  content: "";
  position: absolute;
  width: 720px; height: 720px;
  right: -180px; top: -300px;
  background: radial-gradient(circle, rgba(124,92,255,.30), transparent 62%);
  filter: blur(20px);
}
.hero::after {
  content: "";
  position: absolute;
  width: 520px; height: 520px;
  left: -220px; bottom: -320px;
  background: radial-gradient(circle, rgba(79,209,255,.16), transparent 64%);
}

.hero-in { position: relative; display: grid; grid-template-columns: 1.06fr .94fr; gap: 56px; align-items: center; }

.tag {
  display: inline-flex; align-items: center; gap: 8px;
  height: 30px; padding: 0 14px; border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  font-size: 12.5px; color: var(--dim); letter-spacing: .5px;
}
.tag i { width: 6px; height: 6px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 10px var(--ok); }

h1 {
  margin: 22px 0 18px;
  font-size: clamp(32px, 4.4vw, 52px);
  line-height: 1.18;
  letter-spacing: -.5px;
  font-weight: 800;
}
h1 em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead { color: var(--dim); font-size: 16.5px; max-width: 520px; }

.hero-actions { display: flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }

.hero-meta { display: flex; gap: 34px; margin-top: 40px; }
.hero-meta div b { display: block; font-size: 22px; font-weight: 750; letter-spacing: -.3px; }
.hero-meta div span { font-size: 12.5px; color: var(--dim); }

/* 电视样机 */
.tv {
  position: relative;
  border-radius: 20px;
  padding: 12px;
  background: linear-gradient(160deg, #1b2540, #0b1120);
  border: 1px solid rgba(148,173,219,.18);
  box-shadow: 0 40px 90px rgba(0,0,0,.6);
}
.tv::after {
  content: "";
  position: absolute; left: 50%; bottom: -13px; transform: translateX(-50%);
  width: 76px; height: 6px; border-radius: 4px;
  background: #24314d;
}
.tv-screen {
  border-radius: 12px;
  background: radial-gradient(120% 100% at 80% 0%, #16233c 0%, #080d18 70%);
  padding: 22px 24px 24px;
  min-height: 336px;
  display: flex;
  flex-direction: column;
}
.tv-top { display: flex; align-items: center; justify-content: space-between; font-size: 12px; color: var(--dim); }
.tv-top .chip {
  padding: 4px 10px; border-radius: 999px; background: rgba(79,209,255,.12);
  color: #7ee0ff; border: 1px solid rgba(79,209,255,.3); font-variant-numeric: tabular-nums;
}
.q { margin: 18px 0 16px; font-size: 16.5px; font-weight: 650; line-height: 1.5; }
.opts { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.opt {
  display: flex; align-items: center; gap: 9px;
  padding: 11px 12px; border-radius: 10px;
  background: rgba(255,255,255,.045);
  border: 1px solid var(--line);
  font-size: 13.5px;
}
.opt b {
  width: 20px; height: 20px; border-radius: 6px;
  display: grid; place-items: center;
  background: rgba(255,255,255,.08); font-size: 11px; color: var(--dim);
}
.opt.on { border-color: rgba(79,209,255,.65); background: rgba(79,209,255,.10); }
.opt.on b { background: var(--accent); color: #04121b; }
.tv-bar { margin-top: auto; display: flex; align-items: center; gap: 10px; font-size: 12px; color: var(--dim); }
.tv-bar i { flex: 1; height: 5px; border-radius: 3px; background: rgba(255,255,255,.1); overflow: hidden; }
.tv-bar i span { display: block; height: 100%; width: 62%; background: var(--grad); }

/* ---------------------------------------------------------------- 通用段 */
section { padding: 76px 0; }
.sec-head { margin-bottom: 40px; }
.sec-head h2 { font-size: clamp(24px, 2.8vw, 33px); letter-spacing: -.3px; font-weight: 750; }
.sec-head p { color: var(--dim); margin-top: 10px; font-size: 15px; }

.grid4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }

.card {
  background: linear-gradient(170deg, rgba(255,255,255,.05), rgba(255,255,255,.015));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: border-color .2s, transform .2s;
}
.card:hover { border-color: rgba(124,92,255,.42); transform: translateY(-3px); }
.card .ico {
  width: 42px; height: 42px; border-radius: 12px;
  display: grid; place-items: center;
  background: rgba(124,92,255,.14);
  border: 1px solid rgba(124,92,255,.28);
  margin-bottom: 16px;
}
.card .ico svg { width: 21px; height: 21px; stroke: #b9a8ff; fill: none; stroke-width: 1.7; }
.card h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.card p { font-size: 13.6px; color: var(--dim); line-height: 1.72; }

/* ---------------------------------------------------------------- 家长中心 */
.console { display: grid; grid-template-columns: 1fr 1.15fr; gap: 22px; align-items: start; }

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.panel h3 { font-size: 17px; margin-bottom: 6px; }
.panel .sub { font-size: 13px; color: var(--dim); margin-bottom: 22px; }

.tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.tab {
  flex: 1; height: 38px; border-radius: 9px; border: 1px solid var(--line);
  background: transparent; color: var(--dim); font-size: 14px; cursor: pointer;
  font-family: inherit;
}
.tab.on { background: rgba(79,209,255,.10); border-color: rgba(79,209,255,.45); color: #9fe6ff; }

.field { margin-bottom: 14px; }
.field label { display: block; font-size: 12.5px; color: var(--dim); margin-bottom: 7px; }
.field input {
  width: 100%; height: 44px; padding: 0 14px;
  border-radius: 10px; border: 1px solid var(--line);
  background: rgba(255,255,255,.04); color: var(--text);
  font-size: 14.5px; font-family: inherit;
  outline: none; transition: border-color .18s, background .18s;
}
.field input:focus { border-color: rgba(79,209,255,.6); background: rgba(79,209,255,.05); }
.field input::placeholder { color: #5c6c8a; }

.hint { font-size: 12.2px; color: var(--dim); margin-top: 4px; }
.msg { font-size: 13px; margin-top: 12px; min-height: 20px; }
.msg.err { color: #ff8fa3; }
.msg.ok { color: var(--ok); }

.stats-empty { color: var(--dim); font-size: 13.5px; }

.stat-row { display: flex; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.stat {
  flex: 1; min-width: 100px; padding: 14px 16px; border-radius: 12px;
  background: rgba(255,255,255,.03); border: 1px solid var(--line);
}
.stat b { display: block; font-size: 21px; font-weight: 750; letter-spacing: -.4px; }
.stat span { font-size: 12px; color: var(--dim); }

.bars { display: flex; align-items: flex-end; gap: 8px; height: 108px; margin-top: 6px; }
.bars .b { flex: 1; display: flex; flex-direction: column; justify-content: flex-end; align-items: center; gap: 6px; }
.bars .b i { width: 100%; border-radius: 5px 5px 2px 2px; background: linear-gradient(180deg, #7c5cff, rgba(79,209,255,.5)); min-height: 3px; }
.bars .b em { font-size: 10.5px; color: var(--dim); font-style: normal; }

/* ---------------------------------------------------------------- 页脚 */
footer { border-top: 1px solid var(--line); padding: 34px 0 44px; color: var(--dim); font-size: 13px; }
.foot-in { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; align-items: center; }

@media (max-width: 900px) {
  .nav-links { display: none; }
  .hero-in, .console { grid-template-columns: 1fr; }
  .grid4 { grid-template-columns: 1fr 1fr; }
  .hero { padding: 52px 0 40px; }
  section { padding: 52px 0; }
  .hero-meta { gap: 22px; }
}