/* ============================================================
   记忆之锁 · Web 站共享样式（双语 / 优先 System 主题 + 手动切换）
   ============================================================ */
:root {
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  /* Light（默认） */
  --bg: #f6f7fb;
  --bg-soft: #ffffff;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-solid: #ffffff;
  --border: rgba(20, 24, 40, 0.09);
  --border-strong: rgba(20, 24, 40, 0.16);
  --text: #171b2b;
  --text-muted: #5c6274;
  --text-faint: #9096a8;
  --brand: #0aa179;
  --brand-strong: #088563;
  --brand-soft: rgba(10, 161, 121, 0.12);
  --accent: #3b82f6;
  --danger: #e5484d;
  --success: #0aa179;
  --shadow: 0 8px 30px rgba(20, 24, 40, 0.08);
  --shadow-lg: 0 20px 60px rgba(20, 24, 40, 0.14);
  --radius: 14px;
  --radius-lg: 22px;
  --mono: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
}
[data-theme="dark"] {
  --bg: #0d1017;
  --bg-soft: #151a24;
  --surface: rgba(30, 36, 50, 0.66);
  --surface-solid: #161c28;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #eef0f6;
  --text-muted: #a2a8bb;
  --text-faint: #6c7186;
  --brand: #22c997;
  --brand-strong: #2fe0a6;
  --brand-soft: rgba(34, 201, 151, 0.16);
  --accent: #60a5fa;
  --danger: #f87171;
  --success: #22c997;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 24px 70px rgba(0, 0, 0, 0.55);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  background:
    radial-gradient(1200px 500px at 80% -10%, var(--brand-soft), transparent 60%),
    radial-gradient(900px 420px at -10% 10%, rgba(59,130,246,.08), transparent 55%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background .3s ease, color .3s ease;
}
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-strong); }

/* ---- 顶部导航 ---- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(22px) saturate(180%);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1080px; margin: 0 auto; padding: 14px 22px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; letter-spacing: .2px; }
.logo-badge {
  width: 34px; height: 34px; border-radius: 8px;
  object-fit: contain; display: block;
  background: transparent;
}
.logo b { font-weight: 800; }
.logo span { color: var(--text-faint); font-weight: 400; font-size: 14px; }
.nav-actions { display: flex; align-items: center; gap: 10px; }

/* ---- 主题切换 ---- */
.theme-toggle {
  width: 40px; height: 40px; border-radius: 12px; border: 1px solid var(--border);
  background: var(--surface-solid); color: var(--text); cursor: pointer; font-size: 18px;
  display: grid; place-items: center; transition: transform .2s ease, border-color .2s;
}
.theme-toggle:hover { transform: scale(1.05); border-color: var(--border-strong); }

/* ---- 语言切换 ---- */
.lang-toggle {
  display: flex; border: 1px solid var(--border); border-radius: 12px; overflow: hidden;
}
.lang-toggle button {
  border: none; background: transparent; color: var(--text-muted); cursor: pointer;
  padding: 8px 12px; font-size: 13px; font-weight: 600; transition: all .2s;
}
.lang-toggle button.active { background: var(--brand-soft); color: var(--brand); }

/* ---- 按钮 ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: 12px; padding: 12px 20px; font-size: 15px; font-weight: 600;
  cursor: pointer; border: 1px solid transparent; transition: transform .15s ease, box-shadow .2s, background .2s;
  text-decoration: none; line-height: 1.2;
}
.btn:active { transform: scale(.98); }
.btn-primary { background: linear-gradient(135deg, var(--brand), var(--accent)); color: #fff; box-shadow: 0 6px 20px var(--brand-soft); }
.btn-primary:hover { box-shadow: 0 10px 30px var(--brand-soft); filter: brightness(1.05); }
.btn-primary:disabled { opacity: .55; cursor: not-allowed; filter: none; }
.btn-ghost { background: var(--surface-solid); color: var(--text); border-color: var(--border-strong); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }
.btn-block { width: 100%; }
.btn-sm { padding: 8px 14px; font-size: 13px; border-radius: 10px; }

/* ---- 布局 ---- */
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 22px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.mt-8 { margin-top: 56px; }
.mt-4 { margin-top: 28px; }
.center { text-align: center; }

/* ---- Hero ---- */
.hero { padding: 72px 0 40px; }
.hero .eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .5px;
  color: var(--brand); background: var(--brand-soft); padding: 6px 14px; border-radius: 999px;
}
.hero h1 { font-size: clamp(30px, 5vw, 48px); line-height: 1.15; margin: 20px 0 16px; font-weight: 800; letter-spacing: -.5px; }
.hero p.lead { font-size: 18px; color: var(--text-muted); max-width: 560px; margin: 0 auto 28px; }
.hero .btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---- 特征卡 ---- */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 56px; }
.feature {
  background: var(--surface); backdrop-filter: blur(16px); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 26px; transition: transform .25s ease, box-shadow .25s, border-color .25s;
}
.feature:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--brand); }
.feature .ico { font-size: 26px; margin-bottom: 12px; display: inline-block; }
.feature h3 { margin: 0 0 8px; font-size: 17px; }
.feature p { margin: 0; color: var(--text-muted); font-size: 14px; }

/* ---- 卡片 & 表单 ---- */
.card {
  background: var(--surface); backdrop-filter: blur(18px); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow); padding: 30px;
}
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--text-muted); }
.form-group input {
  width: 100%; padding: 12px 14px; font-size: 15px; color: var(--text);
  background: var(--surface-solid); border: 1px solid var(--border-strong); border-radius: 12px;
  outline: none; transition: border-color .2s, box-shadow .2s;
}
.form-group input:focus { border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }
.form-hint { font-size: 12px; color: var(--text-faint); margin-top: 4px; }
.form-error { background: rgba(229,72,77,.1); color: var(--danger); border: 1px solid rgba(229,72,77,.3); border-radius: 10px; padding: 10px 14px; font-size: 14px; margin-bottom: 16px; display: none; }
.form-error.show { display: block; }

/* ---- 登录/注册容器 ---- */
.auth-wrap { max-width: 480px; margin: 48px auto; }
.auth-card .tabs { display: flex; background: var(--brand-soft); border-radius: 12px; padding: 4px; margin-bottom: 24px; }
.auth-card .tabs button {
  flex: 1; border: none; background: transparent; color: var(--text-muted); font-weight: 600;
  padding: 11px; border-radius: 9px; cursor: pointer; transition: all .2s; font-size: 14px;
}
.auth-card .tabs button.active { background: var(--surface-solid); color: var(--brand); box-shadow: var(--shadow); }
.auth-card h2 { margin: 0 0 6px; font-size: 24px; }
.auth-card .sub { color: var(--text-muted); font-size: 14px; margin: 0 0 24px; }
.auth-alt { text-align: center; font-size: 13px; color: var(--text-faint); margin-top: 20px; }
.auth-alt a { color: var(--text-faint); text-decoration: underline; text-underline-offset: 3px; transition: color .2s; }
.auth-alt a:hover { color: var(--brand); }

/* ---- 控制台 ---- */
.console-wrap { max-width: 860px; margin: 40px auto; }
.dash-top { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; margin-bottom: 22px; }
.dash-top h1 { font-size: 24px; margin: 0; }
.welcome { color: var(--text-muted); font-size: 14px; }

.code-box {
  display: flex; align-items: center; justify-content: space-between; gap: 18px;
  background: linear-gradient(135deg, var(--brand-soft), rgba(59,130,246,.1));
  border: 1px solid var(--brand); border-radius: var(--radius-lg);
  padding: 30px; margin-bottom: 20px; flex-wrap: wrap;
}
.code-digits { font-family: var(--mono); font-size: clamp(40px, 8vw, 64px); font-weight: 800; letter-spacing: 10px; color: var(--brand); line-height: 1; }
.code-meta { font-size: 14px; color: var(--text-muted); }
.countdown { font-family: var(--mono); font-weight: 700; color: var(--text); }
.progress { height: 6px; background: var(--border); border-radius: 999px; overflow: hidden; margin-top: 10px; }
.progress>i { display: block; height: 100%; background: linear-gradient(90deg, var(--brand), var(--accent)); border-radius: 999px; transition: width 1s linear; }

.grid-2-sm { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 20px; }
.card.small { padding: 20px; }
.card h4 { margin: 0 0 10px; font-size: 15px; display: flex; align-items: center; gap: 8px; }
.card h4 .ico { font-size: 17px; }
.kv { display: flex; flex-direction: column; gap: 8px; }
.kv .row { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 8px 0; border-bottom: 1px dashed var(--border); }
.kv .row:last-child { border-bottom: none; }
.kv .k { font-size: 12px; color: var(--text-faint); }
.kv .v { font-family: var(--mono); font-size: 12px; color: var(--text); word-break: break-all; }
.copy-btn { background: var(--brand-soft); color: var(--brand); border: none; border-radius: 8px; padding: 5px 10px; font-size: 12px; font-weight: 600; cursor: pointer; transition: all .2s; flex-shrink: 0; }
.copy-btn:hover { background: var(--brand); color: #fff; }

/* ---- 代码块 ---- */
pre.code {
  background: #0d1117; color: #c9d1d9; border-radius: 14px; padding: 18px;
  font-family: var(--mono); font-size: 13px; line-height: 1.7; overflow-x: auto;
  border: 1px solid rgba(255,255,255,.08); margin: 0 0 20px;
}
pre.code .tab-host { color: #ff7b72; }
pre.code .tok-s { color: #a5d6ff; }
pre.code .tok-k { color: #ff7b72; }

/* ---- 步骤 ---- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 32px; }
.step { position: relative; padding: 20px; background: var(--surface-solid); border: 1px solid var(--border); border-radius: var(--radius); }
.step .num { font-size: 12px; font-weight: 700; color: var(--brand); background: var(--brand-soft); width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center; margin-bottom: 12px; }
.step .t { font-weight: 700; font-size: 14px; margin-bottom: 4px; }
.step .d { font-size: 13px; color: var(--text-muted); }

.footer { text-align: center; color: var(--text-faint); font-size: 13px; padding: 40px 22px 30px; border-top: 1px solid var(--border); margin-top: 80px; }
.footer a { color: var(--text-faint); text-decoration: underline; text-underline-offset: 3px; transition: color .2s; }
.footer a:hover { color: var(--brand); }

/* ---- 响应式 ---- */
@media (max-width: 820px) {
  .grid-2, .grid-2-sm { grid-template-columns: 1fr; }
  .features { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .hero { padding: 48px 0 24px; }
}
@media (max-width: 480px) {
  .steps { grid-template-columns: 1fr; }
  .code-digits { letter-spacing: 6px; }
}