/* ============================================================
   猫头鹰监控系统 官网 — 共享样式 (深色科技风)
   与客户端一致: #0f172a 底 + #1677ff 主色 + 卡片 rgba(22,33,55,.6)
   移动端优先; 纯静态, 无构建链
   ============================================================ */
:root {
  --bg: #0f172a;
  --bg-2: #131c33;
  --card: rgba(22, 33, 55, 0.6);
  --card-solid: #162137;
  --border: rgba(148, 163, 184, 0.16);
  --border-hi: rgba(22, 119, 255, 0.45);
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --text-faint: #64748b;
  --primary: #1677ff;
  --primary-hi: #3b8fff;
  --primary-dim: rgba(22, 119, 255, 0.14);
  --ok: #22c55e;
  --warn: #f59e0b;
  --danger: #ef4444;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 12px 40px rgba(2, 6, 23, 0.55);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SF Mono", "Cascadia Code", Consolas, "Courier New", monospace;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--primary-hi); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(15, 23, 42, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.3px;
}
.nav-brand:hover { text-decoration: none; }
.nav-logo-img {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  object-fit: contain;
  display: block;
}
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  color: var(--text-dim);
  padding: 7px 12px;
  border-radius: 8px;
  font-size: 14px;
  transition: all 0.15s;
}
.nav-links a:hover { color: var(--text); background: var(--primary-dim); text-decoration: none; }
.nav-links a.active { color: var(--primary-hi); background: var(--primary-dim); }
/* 导航分隔线 (登录/注册项之前) */
.nav-sep {
  display: inline-block;
  width: 1px;
  height: 18px;
  margin: 0 8px;
  background: var(--border);
  vertical-align: middle;
}
/* 独立登录/注册导航项 (与首页/下载/套餐/FAQ 并列, 常规入口样式一致) */
.nav-login-link, .nav-register-link {
  font-weight: 500;
}
.nav-register-link {
  color: var(--primary-hi) !important;
  font-weight: 600;
}
.nav-cta {
  margin-left: 8px;
  background: var(--primary);
  color: #fff !important;
  border-radius: 8px;
  padding: 8px 16px !important;
  font-weight: 600;
}
.nav-cta:hover { background: var(--primary-hi); }
/* 免费注册 (主按钮) + 登录 (渐变描边次按钮) */
.nav-register { margin-left: 8px; }
.nav-login {
  margin-left: 0;
  background: transparent;
  color: var(--text) !important;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.nav-login:hover { background: var(--primary-dim); }
.nav-user { font-size: 13px; color: var(--text-dim); }

/* V7.9.343/347: 已登录用户菜单 — 用户名按钮 + 下拉 (个人中心/退出登录) */
.nav-user-menu { position: relative; display: inline-flex; align-items: center; }
.nav-user-btn {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 6px 12px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--border); background: transparent;
  color: var(--primary-hi); font-size: 13px; font-weight: 600;
  transition: all .15s ease;
}
.nav-user-btn:hover { background: var(--primary-dim); }
.nav-caret { font-size: 10px; color: var(--text-faint); }
.nav-user-drop {
  position: absolute; top: calc(100% + 6px); right: 0; z-index: 100;
  min-width: 150px; padding: 6px;
  background: var(--bg-field); border: 1px solid var(--border);
  border-radius: 10px; box-shadow: 0 8px 24px rgba(0,0,0,.35);
}
.nav-user-drop a {
  display: block; padding: 8px 12px; border-radius: 8px;
  font-size: 13px; color: var(--text); text-decoration: none;
}
.nav-user-drop a:hover { background: var(--primary-dim); color: var(--primary-hi); }
.nav-user-drop .nav-logout { color: var(--text-dim); }
.nav-user-drop .nav-logout:hover { color: #ff6b6b; background: rgba(255,107,107,.08); }

/* V7.9.343: 帮助中心 (分类 Tab / 标签 / 手风琴) */
.help-tabs {
  display: flex; flex-wrap: wrap; gap: 8px;
  justify-content: center; margin-bottom: 10px;
}
.help-tab {
  padding: 7px 16px; border-radius: 20px; cursor: pointer;
  border: 1px solid var(--border); background: transparent;
  color: var(--text-dim); font-size: 13px;
  transition: all .15s ease;
}
.help-tab:hover { color: var(--text); border-color: var(--primary); }
.help-tab.active {
  color: #fff; background: var(--primary);
  border-color: var(--primary); font-weight: 600;
}
.help-count {
  text-align: center; color: var(--text-faint);
  font-size: 12px; margin: 4px 0 12px;
}
.help-item h3 { font-size: 15px; margin: 0 0 4px; }
.help-item h3:hover { color: var(--primary-hi); }
.help-tags { margin-left: 8px; }
.help-tags em {
  font-style: normal; font-size: 11px; color: var(--text-faint);
  background: var(--primary-dim); padding: 2px 8px;
  border-radius: 10px; margin-right: 4px;
}
.help-body {
  color: var(--text-dim); font-size: 13px; line-height: 1.8;
  padding-top: 8px; border-top: 1px dashed var(--border); margin-top: 8px;
}
.help-body p { margin: 0 0 6px; }

@media (max-width: 768px) {
  .help-tabs { gap: 6px; }
  .help-tab { padding: 6px 12px; font-size: 12px; }
}

/* ---------- 主容器 ---------- */
.main {
  flex: 1;
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 20px 60px;
}
.main-narrow { max-width: 640px; }

/* ---------- Hero ---------- */
.hero {
  text-align: center;
  padding: 72px 0 48px;
}
.hero-badge {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 999px;
  background: var(--primary-dim);
  border: 1px solid var(--border-hi);
  color: var(--primary-hi);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 22px;
  letter-spacing: 0.4px;
}
.hero h1 {
  font-size: clamp(30px, 5vw, 48px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}
.hero h1 .grad {
  background: linear-gradient(90deg, var(--primary-hi), #7db4ff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p.sub {
  color: var(--text-dim);
  font-size: clamp(15px, 2vw, 18px);
  max-width: 640px;
  margin: 0 auto 32px;
}
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 26px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font);
  line-height: 1.4;
}
.btn:disabled { opacity: 0.55; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hi); text-decoration: none; }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-hi);
}
.btn-ghost:hover { background: var(--primary-dim); }
.btn-block { width: 100%; }
.btn-lg { padding: 14px 36px; font-size: 16px; }
.btn-sm { padding: 7px 14px; font-size: 13px; border-radius: 8px; }

/* ---------- 区块标题 ---------- */
.section { padding: 48px 0; }
.section-title {
  text-align: center;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  margin-bottom: 10px;
}
.section-sub {
  text-align: center;
  color: var(--text-dim);
  max-width: 560px;
  margin: 0 auto 40px;
  font-size: 14.5px;
}

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: all 0.18s;
}
.card:hover {
  border-color: var(--border-hi);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(22,119,255,.18), rgba(34,211,238,.10));
  color: var(--primary-hi);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 16px;
}
/* 现代线性图标 (渐变 stroke) */
.card-icon svg {
  width: 22px;
  height: 22px;
  display: block;
}
.card-icon svg * { transition: stroke-opacity .15s; }
.card:hover .card-icon svg { filter: drop-shadow(0 0 6px rgba(59,143,255,.45)); }
.card h3 { font-size: 17px; margin-bottom: 8px; }
.card p { color: var(--text-dim); font-size: 14px; }

/* ---------- 步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 18px; counter-reset: step; }
.step {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 20px;
  position: relative;
}
.step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 800;
  color: var(--primary);
  opacity: 0.85;
  display: block;
  margin-bottom: 10px;
}
.step h4 { font-size: 15.5px; margin-bottom: 6px; }
.step p { color: var(--text-dim); font-size: 13.5px; }

/* ---------- 表单 ---------- */
.form-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 28px;
}
.form-title { font-size: 22px; font-weight: 800; margin-bottom: 6px; }
.form-sub { color: var(--text-dim); font-size: 13.5px; margin-bottom: 24px; }
.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-size: 13.5px;
  color: var(--text-dim);
  margin-bottom: 7px;
  font-weight: 600;
}
.input {
  width: 100%;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.6);
  color: var(--text);
  font-size: 14.5px;
  font-family: var(--font);
  transition: border-color 0.15s;
}
.input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-dim);
}
.input::placeholder { color: var(--text-faint); }
.form-msg { font-size: 13.5px; margin-top: 12px; min-height: 20px; }
.form-msg.ok { color: var(--ok); }
.form-msg.err { color: var(--danger); }
.form-foot {
  margin-top: 20px;
  text-align: center;
  font-size: 13.5px;
  color: var(--text-dim);
}

/* ---------- 表格 ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
table { width: 100%; border-collapse: collapse; min-width: 520px; }
th, td { padding: 12px 14px; text-align: left; font-size: 13.5px; }
th {
  background: var(--card-solid);
  color: var(--text-dim);
  font-weight: 700;
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
}
td { border-bottom: 1px solid rgba(148, 163, 184, 0.08); }
tr:last-child td { border-bottom: none; }
td.mono { font-family: var(--mono); font-size: 12.5px; }

/* ---------- 徽标 ---------- */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}
.badge-blue { background: var(--primary-dim); color: var(--primary-hi); }
.badge-green { background: rgba(34, 197, 94, 0.14); color: var(--ok); }
.badge-orange { background: rgba(245, 158, 11, 0.14); color: var(--warn); }
.badge-red { background: rgba(239, 68, 68, 0.14); color: var(--danger); }
.badge-gray { background: rgba(148, 163, 184, 0.12); color: var(--text-dim); }

/* ---------- FAQ ---------- */
.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  margin-bottom: 12px;
}
.faq-item h3 {
  font-size: 15px;
  color: var(--text);
  margin-bottom: 6px;
  cursor: pointer;
}
.faq-item p {
  color: var(--text-dim);
  font-size: 13.5px;
  display: none;
}
.faq-item.open p { display: block; }
.faq-item h3::before { content: "▸ "; color: var(--primary-hi); }
.faq-item.open h3::before { content: "▾ "; }

/* ---------- 状态条 ---------- */
.usage-bar {
  height: 8px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.14);
  overflow: hidden;
  margin-top: 8px;
}
.usage-bar > i {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), #4f8cff);
  transition: width 0.4s;
}

/* ---------- 提示条 ---------- */
.notice {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  margin-bottom: 18px;
  border: 1px solid;
}
.notice-warn {
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.35);
  color: var(--warn);
}
.notice-info {
  background: var(--primary-dim);
  border-color: var(--border-hi);
  color: var(--primary-hi);
}

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 28px 20px 40px;
  background: var(--bg-2);
}
.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: space-between;
  align-items: center;
  color: var(--text-faint);
  font-size: 13px;
}
.footer-links { display: flex; gap: 18px; }
.footer-links a { color: var(--text-faint); }
.footer-links a:hover { color: var(--text-dim); }

/* ---------- 下载面板 ---------- */
.dl-panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 28px;
  max-width: 620px;
  margin: 0 auto;
  text-align: center;
}
.dl-version {
  font-size: 40px;
  font-weight: 800;
  background: linear-gradient(90deg, var(--primary-hi), #7db4ff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin: 8px 0 4px;
}
.dl-meta {
  color: var(--text-faint);
  font-size: 12.5px;
  font-family: var(--mono);
  margin-bottom: 22px;
  word-break: break-all;
}
.dl-changelog {
  text-align: left;
  background: rgba(15, 23, 42, 0.55);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-size: 13px;
  color: var(--text-dim);
  margin: 20px 0 6px;
}

/* ---------- 骨架屏 ---------- */
.skeleton {
  position: relative;
  overflow: hidden;
  background: var(--card-solid);
  border-radius: var(--radius-sm);
}
.skeleton::after {
  content: "";
  position: absolute;
  inset: 0;
  transform: translateX(-100%);
  background: linear-gradient(90deg, transparent, rgba(148, 163, 184, 0.1), transparent);
  animation: shimmer 1.4s infinite;
}
@keyframes shimmer { 100% { transform: translateX(100%); } }

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  .nav-inner { height: auto; min-height: 56px; flex-wrap: wrap; padding: 8px 12px; gap: 4px; }
  .nav-links { flex-wrap: wrap; gap: 2px; }
  .nav-links a { padding: 6px 9px; font-size: 13px; }
  .nav-links a.nav-cta { padding: 7px 12px !important; }
  .nav-sep { display: none; }
  .hero { padding: 48px 0 36px; }
  .main { padding: 28px 16px 48px; }
  .section { padding: 36px 0; }
  .card { padding: 20px 18px; }
  .form-card { padding: 24px 18px; }
  .dl-panel { padding: 24px 18px; }
  .footer-inner { flex-direction: column; text-align: center; }
}
/* 超窄屏 (≤480px): 登录/注册保持可见, 不因空间压缩被挤掉 */
@media (max-width: 480px) {
  .nav-links a { padding: 5px 7px; font-size: 12px; }
  .nav-brand span { font-size: 15px; }
  .nav-user { font-size: 12px; }
}