/* ===== 设计变量 ===== */
:root {
  --brand: #4f46e5;
  --brand-strong: #4338ca;
  --brand-soft: #eef2ff;
  --accent: #06b6d4;
  --ok: #10b981;
  --warn: #f59e0b;
  --danger: #ef4444;

  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #f1f2f7;
  --text: #14161f;
  --text-2: #4b5063;
  --text-3: #7b8095;
  --border: #e4e6ef;
  --shadow: 0 1px 2px rgba(20, 22, 31, .04), 0 8px 24px rgba(20, 22, 31, .06);
  --shadow-lg: 0 12px 40px rgba(20, 22, 31, .12);
  --radius: 14px;
  --radius-sm: 10px;
  --radius-lg: 20px;
  --maxw: 1120px;
}

html[data-theme="dark"] {
  --brand: #8b8cf8;
  --brand-strong: #a5a6ff;
  --brand-soft: #1e1f3a;
  --bg: #0e0f16;
  --surface: #171922;
  --surface-2: #1e2029;
  --text: #eef0f6;
  --text-2: #b9bdcc;
  --text-3: #858a9c;
  --border: #2a2d3a;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .28);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, .45);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 76px;
}

@media (min-width: 861px) { body { padding-bottom: 0; } }

a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
h1, h2, h3, h4 { line-height: 1.35; margin: 0; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--brand); color: #fff; padding: 10px 16px; z-index: 99;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ===== 顶栏 ===== */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: var(--surface);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; gap: 18px;
  padding: 10px 18px;
}
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-mark {
  width: 36px; height: 36px; border-radius: 11px;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #fff; font-weight: 800; font-size: 14px;
  display: grid; place-items: center; letter-spacing: .5px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-size: 15px; }
.brand-text small { color: var(--text-3); font-size: 11.5px; }

.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a {
  padding: 7px 12px; border-radius: 999px; font-size: 14px;
  color: var(--text-2); white-space: nowrap;
}
.nav a:hover { background: var(--surface-2); color: var(--text); }
.nav a.active { background: var(--brand-soft); color: var(--brand-strong); font-weight: 600; }
.nav a.nav-vip { color: var(--brand); font-weight: 600; }
.nav a.nav-vip.active, .nav a.nav-vip:hover { background: var(--brand); color: #fff; }

.topbar-actions { display: flex; gap: 6px; }
.icon-btn {
  border: 1px solid var(--border); background: var(--surface);
  color: var(--text-2); border-radius: 999px; padding: 6px 12px; font-size: 13px;
}
.icon-btn:hover { border-color: var(--brand); color: var(--brand); }

@media (max-width: 860px) {
  .nav { display: none; }
  .topbar-actions { margin-left: auto; }
}

/* ===== 底部导航（移动端） ===== */
.tabbar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 60;
  display: flex; background: var(--surface);
  border-top: 1px solid var(--border);
  padding-bottom: env(safe-area-inset-bottom);
}
.tabbar a {
  flex: 1; text-align: center; padding: 11px 2px 12px;
  font-size: 12px; color: var(--text-3);
}
.tabbar a.active { color: var(--brand); font-weight: 700; }
@media (min-width: 861px) { .tabbar { display: none; } }

/* ===== 布局 ===== */
main { max-width: var(--maxw); margin: 0 auto; padding: 22px 18px 40px; outline: none; }
.section { margin-bottom: 34px; }
.section-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.section-head h2 { font-size: 19px; }
.section-head p { margin: 0; color: var(--text-3); font-size: 13.5px; }
.section-head .more { margin-left: auto; color: var(--brand); font-size: 13.5px; font-weight: 600; }

/* ===== 通用组件 ===== */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.grid { display: grid; gap: 14px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 1000px) { .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: 1px solid transparent; border-radius: 999px;
  padding: 9px 18px; font-size: 14px; font-weight: 600;
  background: var(--brand); color: #fff; transition: transform .12s ease, filter .12s ease;
}
.btn:hover { filter: brightness(1.06); }
.btn:active { transform: scale(.985); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }
.btn-soft { background: var(--brand-soft); color: var(--brand-strong); }
.btn-block { width: 100%; }
.btn-sm { padding: 6px 13px; font-size: 13px; }

.chip {
  display: inline-flex; align-items: center; gap: 5px;
  border: 1px solid var(--border); background: var(--surface);
  border-radius: 999px; padding: 4px 11px; font-size: 12.5px;
  color: var(--text-2); white-space: nowrap;
}
.chip.active { background: var(--brand); border-color: var(--brand); color: #fff; font-weight: 600; }
.chip-row { display: flex; gap: 8px; flex-wrap: wrap; }
.tag {
  display: inline-block; border-radius: 6px; padding: 2px 8px;
  font-size: 12px; background: var(--surface-2); color: var(--text-2);
}
.tag-brand { background: var(--brand-soft); color: var(--brand-strong); }
.tag-ok { background: rgba(16,185,129,.12); color: #0f9d76; }
.tag-warn { background: rgba(245,158,11,.14); color: #b4760a; }
.tag-danger { background: rgba(239,68,68,.12); color: #d13737; }

.field-label { font-size: 12.5px; color: var(--text-3); font-weight: 600; letter-spacing: .3px; }
.muted { color: var(--text-3); }
.small { font-size: 13px; }
.divider { height: 1px; background: var(--border); margin: 16px 0; }
.stack { display: flex; flex-direction: column; gap: 10px; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

/* ===== 首页 ===== */
.hero {
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #4f46e5 0%, #6366f1 45%, #06b6d4 100%);
  color: #fff; padding: 34px 30px; margin-bottom: 22px;
  box-shadow: var(--shadow-lg);
}
.hero h1 { font-size: 27px; margin-bottom: 10px; }
.hero p { margin: 0 0 6px; color: rgba(255,255,255,.9); max-width: 640px; font-size: 15px; }
.hero .hero-actions { display: flex; gap: 10px; margin-top: 20px; flex-wrap: wrap; }
.hero .btn { background: #fff; color: var(--brand-strong); }
.hero .btn-ghost { background: rgba(255,255,255,.14); color: #fff; border-color: rgba(255,255,255,.5); }
.hero-stats { display: flex; gap: 26px; margin-top: 22px; flex-wrap: wrap; }
.hero-stats div strong { display: block; font-size: 21px; }
.hero-stats div span { font-size: 12.5px; color: rgba(255,255,255,.85); }

.pain-list { display: grid; gap: 10px; }
.pain-item { display: flex; gap: 11px; align-items: flex-start; padding: 13px 15px; }
.pain-item .pain-q { font-weight: 600; }
.pain-item .pain-a { color: var(--text-2); font-size: 13.5px; }
.pain-num {
  flex: 0 0 26px; height: 26px; border-radius: 8px; background: var(--brand-soft);
  color: var(--brand-strong); display: grid; place-items: center; font-size: 13px; font-weight: 700;
}

.cat-card { padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.cat-card .cat-top { display: flex; align-items: center; gap: 10px; }
.cat-card .cat-icon { font-size: 22px; }
.cat-card h3 { font-size: 15px; }
.cat-card p { margin: 0; color: var(--text-3); font-size: 13px; }
.cat-card .cat-tools { margin-top: auto; color: var(--text-2); font-size: 12.5px; }

/* ===== 工具卡 ===== */
.tool-card { padding: 15px; display: flex; flex-direction: column; gap: 9px; position: relative; transition: border-color .15s, transform .15s; }
.tool-card:hover { border-color: var(--brand); transform: translateY(-2px); }
.tool-card-top { display: flex; align-items: center; gap: 11px; }
.tool-logo {
  width: 40px; height: 40px; border-radius: 11px; flex: 0 0 40px;
  display: grid; place-items: center; font-size: 19px;
  background: var(--surface-2);
}
.tool-card h3 { font-size: 15.5px; }
.tool-card .tool-sub { color: var(--text-3); font-size: 12px; }
.tool-card .tool-tagline { margin: 0; color: var(--text-2); font-size: 13.5px; min-height: 44px; }
.tool-card .tool-foot { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; margin-top: auto; }
.recommend { margin-left: auto; font-size: 12px; color: var(--warn); letter-spacing: 1px; }
.lock-badge { position: absolute; top: 12px; right: 12px; font-size: 11.5px; color: var(--warn); font-weight: 700; }

/* ===== 筛选栏 ===== */
.filters { display: flex; flex-direction: column; gap: 11px; margin-bottom: 16px; }
.filter-line { display: flex; gap: 8px; align-items: center; }
.filter-line > .field-label { flex: 0 0 62px; }

/* ===== 详情页 ===== */
.detail-hero { padding: 24px; display: flex; gap: 18px; flex-wrap: wrap; align-items: flex-start; margin-bottom: 18px; }
.detail-hero .tool-logo { width: 60px; height: 60px; flex-basis: 60px; font-size: 28px; border-radius: 16px; }
.detail-hero h1 { font-size: 23px; }
.detail-hero .detail-sub { color: var(--text-3); font-size: 13px; }
.detail-hero .detail-tagline { margin: 8px 0 0; color: var(--text-2); max-width: 640px; }
.detail-actions { display: flex; gap: 9px; flex-wrap: wrap; margin-top: 14px; }
.info-block { padding: 18px; }
.info-block h3 { font-size: 15.5px; margin-bottom: 9px; display: flex; align-items: center; gap: 7px; }
.info-block ul { margin: 0; padding-left: 20px; color: var(--text-2); }
.info-block li { margin-bottom: 5px; }
.info-block li:last-child { margin-bottom: 0; }
.steps { counter-reset: step; margin: 0; padding: 0; list-style: none; }
.steps li {
  position: relative; padding-left: 36px; margin-bottom: 12px; color: var(--text-2);
}
.steps li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: 3px;
  width: 24px; height: 24px; border-radius: 8px;
  background: var(--brand-soft); color: var(--brand-strong);
  display: grid; place-items: center; font-size: 12.5px; font-weight: 700;
}
.steps li:last-child { margin-bottom: 0; }
.steps li strong { color: var(--text); }
.notice {
  border-left: 3px solid var(--warn); background: rgba(245,158,11,.08);
  padding: 12px 14px; border-radius: 0 10px 10px 0; font-size: 13.5px; color: var(--text-2);
}
.notice-danger { border-left-color: var(--danger); background: rgba(239,68,68,.08); }

/* ===== 词典 ===== */
.glossary-item { padding: 0; overflow: hidden; }
.glossary-head {
  width: 100%; text-align: left; background: none; border: 0;
  padding: 14px 16px; display: flex; align-items: center; gap: 10px; color: inherit;
}
.glossary-head:hover { background: var(--surface-2); }
.glossary-head .g-term { font-weight: 700; font-size: 15px; }
.glossary-head .g-en { color: var(--text-3); font-size: 12.5px; }
.glossary-head .g-arrow { margin-left: auto; color: var(--text-3); transition: transform .18s; }
.glossary-item.open .g-arrow { transform: rotate(90deg); }
.glossary-body { padding: 0 16px 16px; display: none; }
.glossary-item.open .glossary-body { display: block; }
.g-plain { font-size: 14.5px; margin: 0 0 8px; }
.g-analogy {
  background: var(--surface-2); border-radius: var(--radius-sm);
  padding: 10px 13px; margin: 10px 0; font-size: 13.5px; color: var(--text-2);
}
.g-analogy strong { color: var(--text); }
.g-meta { display: grid; gap: 8px; margin-top: 10px; }
.g-meta div { font-size: 13.5px; color: var(--text-2); }
.g-meta b { color: var(--text); }

/* ===== 学习路径 ===== */
.day-card { display: flex; gap: 15px; padding: 16px; align-items: flex-start; }
.day-num {
  flex: 0 0 46px; height: 46px; border-radius: 13px;
  background: var(--brand-soft); color: var(--brand-strong);
  display: grid; place-items: center; font-weight: 800; font-size: 15px;
}
.day-card h3 { font-size: 15.5px; }
.day-card .day-goal { color: var(--text-3); font-size: 13px; margin: 2px 0 8px; }
.day-card .day-body { flex: 1; min-width: 0; }
.day-tasks { margin: 0; padding-left: 19px; color: var(--text-2); font-size: 13.5px; }
.day-tasks li { margin-bottom: 4px; }
.day-foot { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 11px; }
.done-flag { color: var(--ok); font-weight: 700; font-size: 13px; }

/* ===== 付费墙 ===== */
.locked-wrap { position: relative; border-radius: var(--radius); overflow: hidden; }
.locked-blur { filter: blur(5px); opacity: .5; pointer-events: none; user-select: none; }
.locked-mask {
  position: absolute; inset: 0; display: grid; place-items: center; text-align: center;
  background: var(--surface);
  background: linear-gradient(180deg, color-mix(in srgb, var(--surface) 40%, transparent), var(--surface) 78%);
  padding: 18px;
}
.locked-mask .locked-inner { max-width: 340px; }
.locked-mask h3 { font-size: 15.5px; margin-bottom: 5px; }
.locked-mask p { margin: 0 0 12px; color: var(--text-2); font-size: 13.5px; }

.plan-grid { display: grid; gap: 14px; grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 860px) { .plan-grid { grid-template-columns: 1fr; } }
.plan { padding: 22px 18px; display: flex; flex-direction: column; gap: 8px; position: relative; }
.plan.featured { border-color: var(--brand); box-shadow: var(--shadow-lg); }
.plan .plan-flag {
  position: absolute; top: -11px; left: 50%; transform: translateX(-50%);
  background: var(--brand); color: #fff; font-size: 12px; font-weight: 700;
  padding: 3px 12px; border-radius: 999px; white-space: nowrap;
}
.plan h3 { font-size: 16px; }
.plan .plan-price { font-size: 30px; font-weight: 800; letter-spacing: -.5px; }
.plan .plan-price small { font-size: 13px; font-weight: 500; color: var(--text-3); }
.plan .plan-note { color: var(--text-3); font-size: 12.5px; margin: 0; }
.plan ul { list-style: none; margin: 8px 0 14px; padding: 0; display: grid; gap: 7px; font-size: 13.5px; color: var(--text-2); }
.plan ul li::before { content: "✓ "; color: var(--ok); font-weight: 700; }
.plan ul li.off { color: var(--text-3); }
.plan ul li.off::before { content: "× "; color: var(--text-3); }
.compare-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.compare-table th, .compare-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: left; }
.compare-table th { color: var(--text-3); font-weight: 600; font-size: 12.5px; }
.compare-table td:not(:first-child) { text-align: center; }
.compare-table tr:last-child td { border-bottom: 0; }

/* ===== 搜索面板 ===== */
.search-overlay { position: fixed; inset: 0; z-index: 100; background: rgba(10, 11, 18, .5); display: grid; place-items: start center; padding-top: 8vh; }
.search-panel {
  width: min(680px, 92vw); background: var(--surface); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); overflow: hidden; max-height: 78vh; display: flex; flex-direction: column;
}
.search-head { display: flex; gap: 10px; padding: 14px; border-bottom: 1px solid var(--border); }
.search-head input {
  flex: 1; border: 1px solid var(--border); border-radius: 999px;
  padding: 9px 16px; font-size: 14.5px; background: var(--surface-2); color: var(--text); outline: none;
}
.search-head input:focus { border-color: var(--brand); }
.search-results { overflow: auto; padding: 8px; }
.result-item { display: block; padding: 11px 13px; border-radius: var(--radius-sm); }
.result-item:hover { background: var(--surface-2); }
.result-item .r-title { font-weight: 600; font-size: 14px; }
.result-item .r-desc { color: var(--text-3); font-size: 12.5px; }
.result-empty { padding: 26px; text-align: center; color: var(--text-3); font-size: 13.5px; }

/* ===== 页脚 ===== */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); margin-top: 20px; }
.footer-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 26px 18px;
  display: grid; gap: 18px; grid-template-columns: repeat(4, minmax(0, 1fr));
}
@media (max-width: 860px) { .footer-inner { grid-template-columns: 1fr; } }
.footer-col strong { font-size: 13.5px; }
.footer-col p { margin: 5px 0 0; color: var(--text-3); font-size: 12.5px; }

/* ===== 通用小组件 ===== */
.empty-state { padding: 40px 20px; text-align: center; color: var(--text-3); }
.breadcrumb { font-size: 13px; color: var(--text-3); margin-bottom: 12px; }
.breadcrumb a:hover { color: var(--brand); }
.pill-free { background: rgba(16,185,129,.12); color: #0f9d76; }
.kv { display: grid; grid-template-columns: 96px 1fr; gap: 6px 12px; font-size: 13.5px; }
.kv dt { color: var(--text-3); }
.kv dd { margin: 0; color: var(--text-2); }
@media (max-width: 480px) { .kv { grid-template-columns: 80px 1fr; } }
.banner-vip {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  background: linear-gradient(120deg, var(--brand-soft), transparent);
  border: 1px solid var(--brand); border-radius: var(--radius);
  padding: 16px 18px; margin-bottom: 20px;
}
.banner-vip .bv-text { flex: 1; min-width: 200px; }
.banner-vip h3 { font-size: 15.5px; }
.banner-vip p { margin: 3px 0 0; color: var(--text-2); font-size: 13.5px; }
/* 修复：hidden 属性必须真的隐藏，否则搜索遮罩会挡住整页点击 */
.search-overlay[hidden] { display: none !important; }

/* ===== 上线自检清单 ===== */
.preflight-item {
  border-left: 3px solid var(--border);
  background: var(--surface);
  border-radius: 0 10px 10px 0;
  padding: 13px 16px;
  margin-bottom: 10px;
}
.preflight-item.error { border-left-color: var(--danger); background: rgba(239, 68, 68, .06); }
.preflight-item.warn { border-left-color: var(--warn); background: rgba(245, 158, 11, .07); }
.preflight-item.ok { border-left-color: var(--ok); }
.preflight-item h4 { font-size: 14.5px; display: flex; align-items: center; gap: 7px; }
.preflight-item p { margin: 5px 0 0; font-size: 13.5px; color: var(--text-2); }
.preflight-item .pf-fix { margin-top: 7px; font-size: 13.5px; color: var(--brand-strong); }
.preflight-mark { font-weight: 800; }
.preflight-item.error .preflight-mark { color: var(--danger); }
.preflight-item.warn .preflight-mark { color: var(--warn); }
.preflight-item.ok .preflight-mark { color: var(--ok); }

/* ===== 细步骤（会员内容里的分步操作） ===== */
.first-win {
  background: linear-gradient(120deg, var(--brand-soft), transparent);
  border-left: 3px solid var(--brand);
  border-radius: 0 10px 10px 0;
  padding: 11px 14px;
  margin-bottom: 14px;
  font-size: 14px;
  color: var(--text-2);
}
.first-win b { color: var(--text); }

.steps-rich li { margin-bottom: 20px; padding-left: 38px; }
.steps-rich li:last-child { margin-bottom: 0; }
.steps-rich li strong { display: block; font-size: 14.5px; color: var(--text); margin-bottom: 5px; }
.steps-rich li::before { top: 1px; width: 26px; height: 26px; }

.step-detail { font-size: 13.5px; color: var(--text-2); line-height: 1.75; }

.step-say {
  margin: 8px 0 0;
  display: flex;
  gap: 8px;
  align-items: baseline;
  background: var(--surface-2);
  border-radius: 8px;
  padding: 8px 11px;
  font-size: 13px;
}
.step-say-label {
  flex: 0 0 auto;
  font-size: 11.5px;
  color: var(--text-3);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 6px;
}
.step-say code {
  color: var(--text);
  font-family: inherit;
  user-select: all;
}

.step-expect, .step-trouble {
  margin-top: 7px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-2);
}
.step-expect { color: var(--text-2); }
.step-expect b { color: var(--ok); font-weight: 600; }
.step-trouble b { color: var(--warn); font-weight: 600; }