/* ============================================================
   Linkbot_Plus 官网公共样式（index / product / changelog 共用）
   ============================================================ */
:root {
  --bg: #07090f;
  --bg-2: #0b0e16;
  --panel: #0e121c;
  --panel-2: #131826;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.14);
  --ink: #edf0f8;
  --ink-soft: #9aa3b8;
  --ink-mute: #626b80;
  --brand: #6d8bff;
  --brand-2: #9a6dff;
  --brand-3: #46c8f5;
  --ok: #3ddc97;
  --warn: #ffab40;
  --radius: 18px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --mono: 'SF Mono', 'Cascadia Code', Consolas, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
::selection { background: rgba(109, 139, 255, .35); }
.wrap { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 20px; border-radius: 12px; font-size: 14.5px; font-weight: 600;
  font-family: inherit; cursor: pointer; border: 1px solid transparent;
  transition: all .18s ease; white-space: nowrap;
}
.btn svg { flex: none; }
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 8px 24px rgba(109, 139, 255, .28), inset 0 1px 0 rgba(255,255,255,.18);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 12px 32px rgba(109, 139, 255, .42), inset 0 1px 0 rgba(255,255,255,.18); }
.btn-ghost { color: var(--ink); background: rgba(255,255,255,.04); border-color: var(--line-strong); }
.btn-ghost:hover { background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.22); }
.btn-lg { padding: 14px 28px; font-size: 16px; border-radius: 14px; }
.btn[disabled] { opacity: .5; cursor: not-allowed; transform: none !important; }

/* ===== 区块骨架 ===== */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; letter-spacing: .04em;
  color: var(--brand); text-transform: uppercase;
}
.eyebrow::before { content: ''; width: 22px; height: 1.5px; background: linear-gradient(90deg, var(--brand), transparent); }
section.block { padding: 104px 0; position: relative; }
.block-head { max-width: 620px; margin-bottom: 56px; }
.block-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.block-head.center .eyebrow { justify-content: center; }
.block-head.center .eyebrow::before { display: none; }
.block-head h2 { font-size: clamp(28px, 4vw, 40px); line-height: 1.2; letter-spacing: -.02em; margin: 14px 0 12px; }
.block-head p { font-size: 16.5px; color: var(--ink-soft); margin: 0; }
.empty { text-align: center; color: var(--ink-mute); padding: 36px; border: 1px dashed var(--line-strong); border-radius: var(--radius); }

/* 进场动画 */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ===== 导航 ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 60;
  background: rgba(7, 9, 15, .72);
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color .25s;
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav-inner { display: flex; align-items: center; height: 68px; gap: 28px; }
.logo { display: flex; align-items: center; gap: 11px; font-weight: 700; font-size: 17px; letter-spacing: -.01em; }
.logo-mark {
  width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
  color: #fff; font-weight: 800; font-size: 16px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 4px 16px rgba(109, 139, 255, .4), inset 0 1px 0 rgba(255,255,255,.25);
}
.nav-links { display: flex; gap: 6px; }
.nav-links a {
  color: var(--ink-soft); font-size: 14px; font-weight: 500;
  padding: 7px 13px; border-radius: 9px; transition: all .15s;
}
.nav-links a:hover { color: var(--ink); background: rgba(255,255,255,.06); }
.nav-links a.on { color: var(--ink); background: rgba(109,139,255,.14); }
.nav-spacer { flex: 1; }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.nav-actions .btn { padding: 8px 16px; font-size: 14px; }

/* ===== 移动端导航（汉堡菜单，由 site.js 注入） ===== */
.nav-burger {
  display: none; width: 40px; height: 40px; flex: none;
  align-items: center; justify-content: center; padding: 0;
  border: 1px solid var(--line-strong); border-radius: 10px;
  background: rgba(255,255,255,.04); color: var(--ink); cursor: pointer;
  transition: background .15s;
}
.nav-burger:hover { background: rgba(255,255,255,.08); }
.nav-mobile {
  display: none; position: absolute; top: 100%; left: 0; right: 0;
  background: #0a0d15;
  border-bottom: 1px solid var(--line);
  box-shadow: 0 24px 48px rgba(0, 0, 0, .5);
  padding: 8px 20px 20px;
  max-height: calc(100vh - 68px); overflow-y: auto;
}
.nav-mobile.open { display: block; }
.nm-links a {
  display: block; padding: 14px 6px; font-size: 15.5px; font-weight: 500;
  color: var(--ink-soft); border-bottom: 1px solid var(--line);
}
.nm-links a:active { color: var(--ink); }
.nm-actions { margin-top: 16px; }
.nm-user { font-size: 13.5px; color: var(--ink-mute); margin-bottom: 12px; padding: 0 6px; }
.nm-btns { display: flex; gap: 10px; flex-wrap: wrap; }
.nm-btns .btn, .nm-actions > .btn { flex: 1; min-width: 128px; }
.nm-actions > .btn + .btn { margin-left: 10px; }

/* ===== 页内头图（子页面用） ===== */
.page-hero { position: relative; padding: 148px 0 56px; overflow: hidden; }
.page-hero .glow {
  position: absolute; left: 50%; top: -300px; transform: translateX(-50%);
  width: 900px; height: 560px; border-radius: 50%; pointer-events: none;
  background: radial-gradient(closest-side, rgba(109,139,255,.18), rgba(154,109,255,.08) 55%, transparent 75%);
  filter: blur(20px);
}
.page-hero h1 { font-size: clamp(32px, 5vw, 48px); line-height: 1.15; letter-spacing: -.02em; margin: 16px 0 14px; }
.page-hero h1 .grad {
  background: linear-gradient(100deg, var(--brand) 10%, var(--brand-2) 55%, var(--brand-3) 95%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.page-hero p.sub { font-size: 17px; color: var(--ink-soft); margin: 0; max-width: 640px; }

/* ===== 底部 CTA ===== */
.cta-band {
  border: 1px solid var(--line-strong); border-radius: 24px; padding: 64px 32px; text-align: center;
  position: relative; overflow: hidden;
  background:
    radial-gradient(560px 260px at 50% 115%, rgba(154,109,255,.2), transparent 70%),
    radial-gradient(560px 260px at 50% -15%, rgba(109,139,255,.16), transparent 70%),
    var(--panel);
}
.cta-band h2 { font-size: clamp(26px, 3.6vw, 36px); margin: 0 0 12px; letter-spacing: -.02em; }
.cta-band p { color: var(--ink-soft); margin: 0 0 30px; font-size: 16px; }

/* ===== 页脚 ===== */
footer { border-top: 1px solid var(--line); padding: 52px 0 40px; background: var(--bg-2); }
.foot-grid { display: flex; align-items: flex-start; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.foot-brand p { color: var(--ink-mute); font-size: 13.5px; margin: 12px 0 0; max-width: 320px; }
.foot-col b { display: block; font-size: 13.5px; margin-bottom: 14px; color: var(--ink); }
.foot-col a { display: block; font-size: 13.5px; color: var(--ink-soft); margin-bottom: 9px; transition: color .15s; }
.foot-col a:hover { color: var(--ink); }
.foot-base {
  margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--line);
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  color: var(--ink-mute); font-size: 13px;
}
.foot-base .sp { flex: 1; }

/* ===== 登录 / 注册弹窗（结构由 site.js 注入） ===== */
.overlay {
  position: fixed; inset: 0; z-index: 100; display: none; align-items: center; justify-content: center;
  background: rgba(4, 6, 12, .68); backdrop-filter: blur(6px); padding: 20px;
}
.overlay.show { display: flex; }
.modal {
  width: 392px; max-width: 100%; border-radius: 20px; padding: 32px 30px 24px; position: relative;
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line-strong);
  box-shadow: 0 40px 100px rgba(0,0,0,.6);
}
.modal .x {
  position: absolute; top: 14px; right: 14px; width: 32px; height: 32px; border: none;
  background: transparent; border-radius: 9px; cursor: pointer; color: var(--ink-mute); font-size: 20px;
}
.modal .x:hover { background: rgba(255,255,255,.07); color: var(--ink); }
.modal h3 { margin: 0 0 20px; text-align: center; font-size: 20px; letter-spacing: -.01em; }
.tabs { display: flex; gap: 4px; padding: 4px; border-radius: 11px; background: rgba(0,0,0,.3); border: 1px solid var(--line); margin-bottom: 20px; }
.tab {
  flex: 1; padding: 9px 0; border: none; border-radius: 8px; background: transparent;
  color: var(--ink-soft); cursor: pointer; font-size: 14px; font-family: inherit; transition: all .15s;
}
.tab.on { background: rgba(109,139,255,.16); color: var(--ink); font-weight: 600; }
.field { display: flex; flex-direction: column; gap: 7px; margin-bottom: 15px; font-size: 12.5px; color: var(--ink-soft); }
.field input {
  padding: 11px 13px; border: 1px solid var(--line-strong); border-radius: 10px; font-size: 14px;
  font-family: inherit; outline: none; background: rgba(0,0,0,.28); color: var(--ink);
  transition: border-color .15s, box-shadow .15s;
}
.field input::placeholder { color: var(--ink-mute); }
.field input:focus { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(109,139,255,.18); }
.msg { font-size: 13px; padding: 9px 12px; border-radius: 9px; margin-bottom: 14px; display: none; }
.msg.err { display: block; background: rgba(255,92,92,.1); color: #ff8080; border: 1px solid rgba(255,92,92,.22); }
.msg.ok { display: block; background: rgba(61,220,151,.1); color: var(--ok); border: 1px solid rgba(61,220,151,.22); }
.modal .btn { width: 100%; }

/* ===== 版本标签（多页共用） ===== */
.rel-tag {
  font-size: 11.5px; padding: 2.5px 10px; border-radius: 999px; font-weight: 600;
  background: rgba(109,139,255,.14); color: var(--brand); border: 1px solid rgba(109,139,255,.25);
}
.rel-tag.beta { background: rgba(255,171,64,.12); color: var(--warn); border-color: rgba(255,171,64,.28); }
.rel-tag.latest { background: rgba(61,220,151,.12); color: var(--ok); border-color: rgba(61,220,151,.28); }

/* ===== 响应式 ===== */
@media (max-width: 720px) {
  /* 桌面导航折叠为汉堡菜单（.nav-mobile 由 site.js 注入） */
  .nav-links { display: none; }
  .nav-actions { display: none; }
  .nav-burger { display: inline-flex; }
  .nav-inner { height: 60px; gap: 14px; }
  .wrap { padding: 0 18px; }
  section.block { padding: 72px 0; }
  .block-head { margin-bottom: 40px; }
  .page-hero { padding: 108px 0 44px; }
  .foot-grid { flex-direction: column; gap: 24px; }
  .btn-lg { padding: 13px 22px; font-size: 15px; }
  .cta-band { padding: 48px 22px; border-radius: 18px; }
  .modal { padding: 26px 20px 20px; }
}