:root {
  --bg: #0f1115;
  --bg-2: #141821;
  --card: #181b22;
  --card-2: #20242d;
  --line: #2a2f3a;
  --text: #eef1f6;
  --muted: #8b93a3;
  --accent: #19c2a0;
  --accent-2: #0ea88a;
  --accent-soft: rgba(25, 194, 160, 0.12);
  --warn: #f5a524;
  --danger: #f05d5e;
  --radius: 16px;
  --max: 1080px;
}

* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.7 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.center { text-align: center; }
.hidden { display: none !important; }

/* ---------- 顶栏 ---------- */
header.nav {
  position: sticky; top: 0; z-index: 20;
  background: rgba(15, 17, 21, 0.86);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 22px; height: 62px; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 700; letter-spacing: 2px; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.nav-links { display: flex; gap: 20px; margin-left: auto; align-items: center; }
.nav-links a { color: var(--muted); font-size: 14px; }
.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; border: 0; cursor: pointer;
  font: inherit; font-size: 15px; font-weight: 600; white-space: nowrap;
}
.btn-primary { background: var(--accent); color: #06231d; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--line); }
.btn-ghost:hover { background: var(--card-2); }
.btn-sm { height: 34px; padding: 0 14px; font-size: 13px; }
.btn:disabled { opacity: 0.5; cursor: default; }

/* ---------- 首屏 ---------- */
.hero { padding: 88px 0 72px; text-align: center; background:
  radial-gradient(900px 420px at 50% -120px, rgba(25, 194, 160, 0.16), transparent 70%); }
.hero h1 { font-size: 44px; line-height: 1.25; font-weight: 800; letter-spacing: -0.5px; }
.hero p.lead { margin: 18px auto 0; max-width: 620px; font-size: 17px; color: var(--muted); }
.hero-actions { display: flex; gap: 12px; justify-content: center; margin-top: 32px; flex-wrap: wrap; }
.hero-note { margin-top: 16px; font-size: 13px; color: var(--muted); }

/* ---------- 板块 ---------- */
section { padding: 72px 0; }
section.alt { background: var(--bg-2); }
h2.title { font-size: 28px; font-weight: 700; text-align: center; }
p.subtitle { text-align: center; color: var(--muted); margin-top: 10px; }

.grid { display: grid; gap: 16px; margin-top: 40px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.card h3 { font-size: 17px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 14px; }
.card .ico { font-size: 22px; margin-bottom: 12px; display: block; }

/* ---------- 套餐 ---------- */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 40px; }
.plan { background: var(--card); border: 1.5px solid var(--line); border-radius: var(--radius); padding: 26px 22px; position: relative; }
.plan.best { border-color: var(--accent); background: linear-gradient(180deg, var(--accent-soft), var(--card) 60%); }
.plan .tag {
  position: absolute; top: -11px; left: 50%; transform: translateX(-50%);
  background: var(--accent); color: #06231d; font-size: 12px; font-weight: 700;
  padding: 3px 12px; border-radius: 99px;
}
.plan h3 { font-size: 16px; color: var(--muted); font-weight: 600; }
.plan .price { font-size: 38px; font-weight: 800; margin: 10px 0 2px; }
.plan .price span { font-size: 14px; font-weight: 500; color: var(--muted); margin-left: 4px; }
.plan-badge {
  display: inline-block; margin-top: 10px; padding: 4px 12px; border-radius: 99px;
  background: var(--accent-soft); color: var(--accent); font-size: 13px; font-weight: 600;
}
.plan ul { list-style: none; padding: 14px 0 22px; display: grid; gap: 9px; font-size: 14px; color: var(--muted); }
.plan li::before { content: "✓"; color: var(--accent); margin-right: 8px; font-weight: 700; }
.plan .btn { width: 100%; }

.trial {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  margin-top: 16px; padding: 16px 20px; border-radius: var(--radius);
  border: 1px dashed var(--line); background: var(--card);
}
.trial .btn { margin-left: auto; }

/* ---------- 下载 ---------- */
.dl-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 36px; }
.dl { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; text-align: center; }
.dl .ico { font-size: 30px; }
.dl h3 { margin: 10px 0 4px; font-size: 16px; }
.dl p { font-size: 12px; color: var(--muted); min-height: 32px; }
.dl .btn { width: 100%; margin-top: 6px; }

/* ---------- 常见问题 ---------- */
.faq { max-width: 760px; margin: 36px auto 0; }
details {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 18px; margin-bottom: 10px;
}
details[open] { border-color: var(--muted); }
summary { cursor: pointer; font-weight: 600; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; float: right; color: var(--muted); }
details[open] summary::after { content: "−"; }
details p { color: var(--muted); font-size: 14px; margin-top: 12px; }

/* ---------- 页脚 ---------- */
footer { border-top: 1px solid var(--line); padding: 36px 0; color: var(--muted); font-size: 13px; }
.foot { display: flex; gap: 20px; flex-wrap: wrap; align-items: center; }
.foot a:hover { color: var(--text); }

/* ---------- 表单 / 登录 ---------- */
.panel {
  max-width: 420px; margin: 70px auto; background: var(--card);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 32px;
}
.panel h1 { font-size: 22px; text-align: center; }
.panel .sub { text-align: center; color: var(--muted); font-size: 14px; margin-top: 6px; margin-bottom: 24px; }
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
input[type="email"], input[type="password"], input[type="text"], input[type="number"], textarea, select {
  width: 100%; background: var(--bg); color: var(--text); border: 1px solid var(--line);
  border-radius: 10px; padding: 12px 14px; font: inherit; font-size: 15px;
}
input:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
textarea { resize: vertical; min-height: 96px; }
.field { margin-bottom: 16px; }
.msg { font-size: 13px; margin: 10px 0; min-height: 18px; }
.msg.err { color: var(--danger); }
.msg.ok { color: var(--accent); }
.switch-line { text-align: center; margin-top: 16px; font-size: 13px; color: var(--muted); }
.switch-line a { color: var(--accent); cursor: pointer; }

/* ---------- 用户中心 ---------- */
.account { padding: 48px 0 72px; }
.acct-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 22px; }
.kv { display: flex; justify-content: space-between; padding: 11px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.kv:last-child { border-bottom: 0; }
.kv b { font-weight: 600; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 99px; font-size: 12px; font-weight: 600; }
.badge.on { background: var(--accent-soft); color: var(--accent); }
.badge.off { background: rgba(240, 93, 94, 0.14); color: var(--danger); }
.bar { height: 6px; border-radius: 99px; background: var(--card-2); overflow: hidden; margin-top: 10px; }
.bar > i { display: block; height: 100%; background: var(--accent); border-radius: 99px; }
.bar > i.mid { background: var(--warn); }
.bar > i.high { background: var(--danger); }

.thread { border: 1px solid var(--line); border-radius: 12px; padding: 14px; margin-bottom: 12px; background: var(--bg); }
.thread h4 { font-size: 14px; display: flex; justify-content: space-between; align-items: center; }
.bubble { margin-top: 10px; padding: 10px 12px; border-radius: 10px; font-size: 14px; background: var(--card-2); }
.bubble.admin { background: var(--accent-soft); }
.bubble .who { font-size: 12px; color: var(--muted); margin-bottom: 4px; }

/* ---------- 手机 ---------- */
@media (max-width: 860px) {
  .grid-3, .grid-4, .plans, .dl-grid, .acct-grid { grid-template-columns: 1fr; }
  /* 手机上一行放不下时让右边那半自己换行，别和左边挤在一起 */
  .kv { flex-wrap: wrap; gap: 2px 12px; }
  .kv > b { margin-left: auto; }
  .hero { padding: 56px 0 48px; }
  .hero h1 { font-size: 31px; }
  section { padding: 52px 0; }
  .nav-links a:not(.btn) { display: none; }
}

/* ---------- 客服入口 ---------- */
.support-link { cursor: pointer; }
.support-link:hover { color: var(--accent) !important; }
.hero-support { display: flex; gap: 10px; justify-content: center; align-items: center; margin-top: 22px; flex-wrap: wrap; }
.support-chip {
  display: inline-flex; align-items: center; gap: 6px; cursor: pointer;
  padding: 6px 14px; border-radius: 99px; border: 1px solid var(--line);
  background: var(--card); font-size: 13px; color: var(--muted);
}
.support-chip:hover { border-color: var(--accent); color: var(--text); }

.support-modal { position: fixed; inset: 0; background: rgba(0,0,0,.6); display: flex;
  align-items: center; justify-content: center; z-index: 60; padding: 20px; }
.support-modal.hidden { display: none; }
.support-card { background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 22px; width: 100%; max-width: 420px; }
.support-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; font-size: 17px; }
.support-close { cursor: pointer; color: var(--muted); }
.support-row { display: flex; gap: 12px; align-items: flex-start; padding: 12px; border-radius: 12px;
  background: var(--card-2); margin-bottom: 8px; }
.support-row:hover { background: var(--accent-soft); }
.support-row .ico { font-size: 20px; }