/* ============================================
   科学筑基行动营 · 全局样式
   组织顺序：变量 → 基础重置 → 布局 → 导航
   → 通用组件 → 各页面样式 → 页脚 → 动画
   ============================================ */

/* ---------- 设计变量 ---------- */
:root {
  --bg: #050607;
  --bg2: #0a0c0e;
  --ink: #e8ecef;
  --ink-dim: #9aa4ad;
  --ink-faint: #5b646d;
  --teal: #35d0c5;
  --teal-soft: rgba(53, 208, 197, .14);
  --violet: #8f7bd8;
  --line: rgba(255, 255, 255, .08);
  --card: rgba(255, 255, 255, .035);
  --serif: "Noto Serif SC", "Songti SC", "STSong", serif;
  --sans: "Noto Sans SC", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
}

/* ---------- 基础重置 ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.8;
  letter-spacing: .02em;
  overflow-x: hidden;
  min-height: 100vh;
}

::selection { background: rgba(53, 208, 197, .3); }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font-family: inherit; }

/* 粒子背景 canvas */
#stars {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .55;
}

/* ---------- 桌面顶部导航 ---------- */
.topnav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(20px, 4vw, 56px);
  height: 64px;
  background: rgba(5, 6, 7, .72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.topnav .brand {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .14em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark { width: 22px; height: 22px; flex: none; }

.topnav .links { display: flex; gap: 6px; }

.topnav .links a {
  font-size: 13.5px;
  color: var(--ink-dim);
  padding: 8px 14px;
  border-radius: 999px;
  letter-spacing: .08em;
  transition: color .25s, background .25s;
}

.topnav .links a:hover { color: var(--ink); }
.topnav .links a.active { color: var(--teal); background: var(--teal-soft); }

/* ---------- 手机底部 Tab ---------- */
.tabbar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 50;
  display: flex;
  justify-content: space-around;
  align-items: stretch;
  background: rgba(6, 7, 8, .85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--line);
  padding-bottom: env(safe-area-inset-bottom);
}

.tabbar a {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: 9px 0 8px;
  color: var(--ink-faint);
  font-size: 10px;
  letter-spacing: .06em;
  transition: color .25s;
}

.tabbar a svg {
  width: 21px;
  height: 21px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.tabbar a.active { color: var(--teal); }
.tabbar a.active .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--teal); }
.tabbar .dot { width: 3px; height: 3px; border-radius: 50%; background: transparent; }

/* ---------- 页面容器 ---------- */
.page {
  display: none;
  position: relative;
  z-index: 1;
  min-height: 100vh;
  padding-bottom: 92px;
  animation: fadeUp .55s cubic-bezier(.22, .8, .32, 1) both;
}

.page.show { display: block; }

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 36px;
}

/* ---------- 通用组件 ---------- */
.kicker {
  font-size: 11px;
  letter-spacing: .35em;
  color: var(--teal);
  text-transform: uppercase;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 12px;
}

.kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--teal);
  opacity: .7;
}

.sec { padding: 72px 0 28px; }

.sec-title {
  font-family: var(--serif);
  font-size: clamp(24px, 4.6vw, 34px);
  font-weight: 700;
  margin: 14px 0 10px;
  line-height: 1.4;
}

.sec-sub {
  color: var(--ink-dim);
  font-size: 14.5px;
  max-width: 680px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px 22px;
  position: relative;
  overflow: hidden;
  transition: transform .35s, border-color .35s;
}

.card:hover {
  transform: translateY(-3px);
  border-color: rgba(53, 208, 197, .3);
}

.card h3 {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 4px;
}

.card .en {
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: .18em;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.card p {
  font-size: 13.5px;
  color: var(--ink-dim);
}

.tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: .12em;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid rgba(53, 208, 197, .4);
  color: var(--teal);
  background: var(--teal-soft);
}

.tag.violet {
  border-color: rgba(143, 123, 216, .45);
  color: var(--violet);
  background: rgba(143, 123, 216, .12);
}

.tag.gray {
  border-color: var(--line);
  color: var(--ink-dim);
  background: rgba(255, 255, 255, .04);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  font-size: 14.5px;
  letter-spacing: .1em;
  padding: 14px 30px;
  border-radius: 999px;
  border: 1px solid rgba(53, 208, 197, .55);
  color: #04211f;
  background: linear-gradient(135deg, #4be0d4, #2bbcb1);
  transition: transform .3s, box-shadow .3s;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(53, 208, 197, .28);
}

.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.btn.ghost:hover {
  border-color: rgba(53, 208, 197, .5);
  box-shadow: none;
  color: var(--teal);
}

.btn.sm { padding: 10px 22px; font-size: 13px; }

/* 滚动显现 */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .8s cubic-bezier(.22, .8, .32, 1),
              transform .8s cubic-bezier(.22, .8, .32, 1);
}

.reveal.in { opacity: 1; transform: none; }

.num-mono {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
}

.ext-link {
  color: var(--teal);
  font-size: 13px;
  letter-spacing: .06em;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
}

.ext-link:hover { text-decoration: underline; }

/* ---------- 首页 HERO ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: .85;
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(5, 6, 7, .35) 0%, rgba(5, 6, 7, .15) 40%, rgba(5, 6, 7, .88) 82%, var(--bg) 100%),
    radial-gradient(60% 60% at 70% 30%, transparent, rgba(5, 6, 7, .5));
}

.hero-inner {
  position: relative;
  padding: 78px 0 90px;
  width: 100%;
}

.hero-quote {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(34px, 9.2vw, 76px);
  line-height: 1.28;
  letter-spacing: .06em;
  margin: 26px 0 22px;
  text-shadow: 0 4px 40px rgba(0, 0, 0, .6);
}

.hero-quote em { font-style: normal; color: var(--teal); }

.hero-sub {
  color: #c6cdd3;
  font-size: clamp(14px, 2.4vw, 17px);
  max-width: 560px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, .7);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 38px;
}

.scroll-hint {
  position: absolute;
  left: 50%;
  bottom: 88px;
  transform: translateX(-50%);
  color: var(--ink-faint);
  font-size: 10px;
  letter-spacing: .4em;
  writing-mode: vertical-rl;
  animation: hint 2.4s ease-in-out infinite;
}

/* 首页统计数字 */
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: -34px;
  position: relative;
  z-index: 2;
}

.stat {
  background: rgba(8, 10, 11, .72);
  backdrop-filter: blur(10px);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px 14px;
  text-align: center;
}

.stat b {
  display: block;
  font-family: var(--serif);
  font-size: clamp(20px, 4.5vw, 30px);
  font-weight: 700;
  color: var(--teal);
}

.stat span { font-size: 11px; color: var(--ink-dim); letter-spacing: .1em; }

/* 三大基石卡片 */
.pillars {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.pillar-num {
  font-family: var(--serif);
  font-size: 13px;
  color: var(--teal);
  letter-spacing: .3em;
  margin-bottom: 12px;
}

/* 转变列表 */
.shifts {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 26px;
}

.shift {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 18px;
  font-size: 14px;
}

.shift .from {
  color: var(--ink-faint);
  text-decoration: line-through;
  text-decoration-color: rgba(255, 255, 255, .25);
  flex: 1;
  min-width: 0;
}

.shift .arrow { color: var(--teal); flex: none; font-family: var(--serif); }
.shift .to { color: var(--ink); flex: 1; min-width: 0; font-weight: 400; }
.shift .no { font-family: var(--serif); color: var(--teal); font-size: 12px; letter-spacing: .2em; flex: none; }

/* ---------- 招募页 ---------- */
.camp-hero { padding: 56px 0 10px; }

.camp-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--teal);
  border: 1px solid rgba(53, 208, 197, .4);
  border-radius: 999px;
  padding: 7px 16px;
  background: var(--teal-soft);
}

.camp-badge .pulse {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--teal);
  animation: pulse 1.8s infinite;
}

.camp-title {
  font-family: var(--serif);
  font-size: clamp(28px, 6.4vw, 46px);
  font-weight: 900;
  line-height: 1.3;
  margin: 22px 0 8px;
}

.camp-theme {
  color: var(--violet);
  font-family: var(--serif);
  font-size: clamp(16px, 3vw, 21px);
  letter-spacing: .12em;
}

.date-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 28px;
}

.date-cell {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
}

.date-cell .lab { font-size: 11px; letter-spacing: .25em; color: var(--ink-faint); margin-bottom: 6px; }

.date-cell .val {
  font-family: var(--serif);
  font-size: clamp(16px, 3.4vw, 20px);
  font-weight: 700;
}

.date-cell .val small {
  display: block;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--teal);
  font-weight: 400;
  margin-top: 4px;
  letter-spacing: .08em;
}

/* 营期时间线 */
.sched {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 26px;
  position: relative;
}

.sched::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--teal), rgba(53, 208, 197, .05));
}

.sched-item {
  position: relative;
  padding: 0 0 26px 52px;
}

.sched-item::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--teal);
}

.sched-item h4 {
  font-family: var(--serif);
  font-size: 16.5px;
  font-weight: 700;
  margin-bottom: 4px;
}

.sched-item h4 small {
  font-family: var(--sans);
  font-size: 11px;
  color: var(--teal);
  letter-spacing: .15em;
  margin-left: 8px;
  font-weight: 400;
}

.sched-item p { font-size: 13.5px; color: var(--ink-dim); }

/* 适合 / 不适合人群 */
.fit-grid {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.fit-col {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 26px 24px;
  background: var(--card);
}

.fit-col h4 {
  font-family: var(--serif);
  font-size: 17px;
  margin-bottom: 16px;
}

.fit-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.fit-col li {
  font-size: 14px;
  color: var(--ink-dim);
  line-height: 1.5;
  padding-left: 24px;
  position: relative;
}

.fit-yes li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--teal);
  font-weight: 700;
}

.fit-no li::before {
  content: "✕";
  position: absolute;
  left: 0;
  color: var(--ink-faint);
  font-weight: 700;
}

.fit-cta {
  margin-top: 24px;
  font-family: var(--serif);
  font-size: 17px;
  color: var(--violet);
  text-align: center;
}

@media (min-width: 640px) {
  .fit-grid { grid-template-columns: 1fr 1fr; }
}

/* 价格卡片 */
.price-grid {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.price {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 26px 22px;
  background: var(--card);
  text-align: center;
  position: relative;
}

.price.hot {
  border-color: rgba(53, 208, 197, .5);
  background: linear-gradient(180deg, rgba(53, 208, 197, .08), rgba(53, 208, 197, .02));
}

.price .who { font-size: 13px; color: var(--ink-dim); letter-spacing: .15em; }

.price .amt {
  font-family: var(--serif);
  font-size: 38px;
  font-weight: 900;
  color: var(--ink);
  margin: 8px 0 4px;
}

.price .amt small { font-size: 15px; font-weight: 400; color: var(--ink-dim); }
.price.hot .amt { color: var(--teal); }
.price .note { font-size: 12px; color: var(--ink-faint); line-height: 1.7; }

.price .corner {
  position: absolute;
  top: 14px;
  right: -32px;
  transform: rotate(38deg);
  background: var(--teal);
  color: #04211f;
  font-size: 10px;
  letter-spacing: .2em;
  padding: 3px 36px;
}

/* 赠品区 */
.gift {
  margin-top: 26px;
  border: 1px dashed rgba(143, 123, 216, .5);
  border-radius: 18px;
  padding: 24px 22px;
  background: rgba(143, 123, 216, .06);
}

.gift h4 {
  font-family: var(--serif);
  color: var(--violet);
  font-size: 17px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.gift p { font-size: 13.5px; color: var(--ink-dim); }

/* 引用块 */
.quote-block {
  border-left: 2px solid var(--teal);
  padding: 6px 0 6px 22px;
  margin: 30px 0;
  font-family: var(--serif);
  font-size: clamp(16px, 3vw, 19px);
  line-height: 1.9;
  color: #cfd6db;
}

.quote-block small {
  display: block;
  margin-top: 10px;
  font-family: var(--sans);
  font-size: 11.5px;
  color: var(--ink-faint);
  letter-spacing: .15em;
}

/* ---------- 二维码联系块 ---------- */
.qr-block {
  margin-top: 26px;
  display: flex;
  gap: 22px;
  align-items: center;
  flex-wrap: wrap;
  border: 1px solid rgba(53, 208, 197, .3);
  border-radius: 20px;
  padding: 24px;
  background: linear-gradient(135deg, rgba(53, 208, 197, .07), rgba(143, 123, 216, .05));
}

.qr-block img {
  width: 148px;
  height: auto;
  border-radius: 12px;
  flex: none;
  background: #fff;
  padding: 6px;
}

.qr-block .qr-info { flex: 1; min-width: 220px; }

.qr-block .qr-info h4 {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.qr-block .qr-info p { font-size: 13.5px; color: var(--ink-dim); }

.qr-block .wx-id {
  font-family: var(--serif);
  color: var(--teal);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .06em;
}

/* ---------- 往期回顾页 ---------- */
.recap {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

.recap-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px 22px;
  background: var(--card);
  display: flex;
  flex-direction: column;
}

.recap-card.current {
  border-color: rgba(53, 208, 197, .45);
  background: linear-gradient(180deg, rgba(53, 208, 197, .07), transparent);
}

.recap-card .rc-date { font-size: 11px; letter-spacing: .2em; color: var(--ink-faint); }

.recap-card h3 {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  margin: 10px 0 8px;
  line-height: 1.5;
}

.recap-card p { font-size: 13px; color: var(--ink-dim); flex: 1; }

.recap-card .rc-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 6px;
}

/* 大数字统计 */
.bigstats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 26px;
}

.bigstat {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px 16px;
  text-align: center;
  background: var(--card);
}

.bigstat b {
  display: block;
  font-family: var(--serif);
  font-size: clamp(18px, 3.8vw, 26px);
  font-weight: 900;
  color: var(--teal);
}

.bigstat span { font-size: 11.5px; color: var(--ink-dim); letter-spacing: .06em; display: block; margin-top: 4px; }

/* 公式块 */
.formula {
  margin-top: 26px;
  text-align: center;
  border: 1px dashed rgba(53, 208, 197, .4);
  border-radius: 18px;
  padding: 28px 20px;
  background: rgba(53, 208, 197, .04);
}

.formula .f {
  font-family: var(--serif);
  font-size: clamp(17px, 3.6vw, 24px);
  font-weight: 700;
  letter-spacing: .05em;
}

.formula .f em { font-style: normal; color: var(--teal); }
.formula p { font-size: 12.5px; color: var(--ink-faint); margin-top: 10px; }

/* 学员证言 */
.voices {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.voice {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
}

.voice q {
  font-family: var(--serif);
  font-size: 14.5px;
  line-height: 1.85;
  color: #cfd6db;
  quotes: "“" "”";
}

.voice .who {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  font-size: 12px;
  color: var(--ink-dim);
}

.voice .who b { color: var(--teal); font-family: var(--serif); font-weight: 700; }
.voice .who span { color: var(--ink-faint); }

/* 沉淀资产 */
.asset-grid {
  display: grid;
  gap: 12px;
  margin-top: 26px;
  grid-template-columns: 1fr 1fr;
}

.asset {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 16px;
  text-align: center;
}

.asset .ic { font-size: 22px; margin-bottom: 8px; }

.asset b {
  display: block;
  font-family: var(--serif);
  font-size: 14.5px;
  font-weight: 700;
  margin-bottom: 4px;
}

.asset span { font-size: 11.5px; color: var(--ink-faint); }

/* ---------- 专栏页 ---------- */
.article-feat {
  margin-top: 26px;
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(53, 208, 197, .07), rgba(143, 123, 216, .06) 60%, transparent);
}

.article-feat .body { padding: 28px 24px; }

.article-feat h3 {
  font-family: var(--serif);
  font-size: clamp(19px, 3.6vw, 25px);
  font-weight: 900;
  line-height: 1.5;
  margin: 12px 0;
}

.article-feat p { font-size: 13.5px; color: var(--ink-dim); }

.article-feat .meta {
  display: flex;
  gap: 14px;
  font-size: 11.5px;
  color: var(--ink-faint);
  letter-spacing: .1em;
  margin-top: 16px;
  flex-wrap: wrap;
}

/* 文章分组 */
.col-group { margin-top: 44px; }

.col-group > .g-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.col-group > .g-head h3 {
  font-family: var(--serif);
  font-size: clamp(17px, 3.2vw, 21px);
  font-weight: 700;
}

.col-group > .g-head span { font-size: 11px; color: var(--ink-faint); letter-spacing: .2em; }

.article-list {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
}

.article-item {
  display: flex;
  gap: 18px;
  padding: 20px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  transition: background .25s;
  align-items: flex-start;
}

.article-item:last-child { border-bottom: none; }
.article-item:hover { background: rgba(53, 208, 197, .05); }

.article-item .a-date {
  flex: none;
  width: 86px;
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: .05em;
  padding-top: 4px;
  font-variant-numeric: tabular-nums;
}

.article-item .a-main { flex: 1; min-width: 0; }

.article-item .a-main h4 {
  font-family: var(--serif);
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.6;
}

.article-item .a-main p {
  font-size: 12.5px;
  color: var(--ink-dim);
  margin-top: 5px;
}

.article-item .a-go {
  flex: none;
  color: var(--teal);
  font-size: 18px;
  padding-top: 2px;
  opacity: .7;
}

/* 概念卡片 */
.concepts {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.concept {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
  background: var(--card);
}

.concept .big {
  font-family: var(--serif);
  font-size: clamp(24px, 5vw, 34px);
  font-weight: 900;
  color: var(--teal);
  line-height: 1.1;
}

.concept .big small {
  font-size: 13px;
  color: var(--ink-dim);
  font-weight: 400;
  letter-spacing: .1em;
  margin-left: 6px;
}

.concept h4 {
  font-family: var(--serif);
  font-size: 15.5px;
  margin: 10px 0 6px;
  font-weight: 700;
}

.concept p { font-size: 13px; color: var(--ink-dim); }
.concept .src { font-size: 11px; color: var(--ink-faint); margin-top: 10px; letter-spacing: .06em; }

/* ---------- 知识库页 ---------- */
.ask-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 26px;
}

.ask {
  background: rgba(53, 208, 197, .05);
  border: 1px solid rgba(53, 208, 197, .22);
  border-radius: 14px;
  padding: 16px 20px;
  font-size: 14px;
  color: #cfe8e5;
  display: flex;
  gap: 12px;
  align-items: baseline;
}

.ask::before {
  content: "Q";
  font-family: var(--serif);
  color: var(--teal);
  font-weight: 900;
  flex: none;
}

.kb-includes {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 26px;
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
}

.kb-row {
  display: flex;
  gap: 16px;
  padding: 18px 20px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  align-items: baseline;
}

.kb-row:last-child { border-bottom: none; }

.kb-row .n {
  font-family: var(--serif);
  color: var(--teal);
  font-size: 13px;
  letter-spacing: .1em;
  flex: none;
}

.kb-row b { font-weight: 500; }
.kb-row span { color: var(--ink-dim); font-size: 12.5px; display: block; }

/* ---------- 关于页 ---------- */
.about-hero { padding: 56px 0 10px; }

.about-top {
  display: flex;
  gap: 30px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 24px;
}

.about-photo {
  width: min(240px, 62vw);
  border-radius: 20px;
  flex: none;
  border: 1px solid rgba(53, 208, 197, .35);
  box-shadow: 0 20px 60px rgba(0, 0, 0, .5), 0 0 0 6px rgba(53, 208, 197, .06);
}

.about-id { flex: 1; min-width: 250px; }

.about-id h1 {
  font-family: var(--serif);
  font-size: clamp(26px, 5.6vw, 40px);
  font-weight: 900;
  line-height: 1.35;
  margin: 12px 0;
}

.about-id .roles {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0;
}

.about-id p { color: var(--ink-dim); font-size: 14.5px; }

/* 里程碑 */
.milestone {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

/* 四象限 */
.quad {
  display: grid;
  gap: 12px;
  margin-top: 26px;
  grid-template-columns: 1fr 1fr;
}

.quad .q-cell {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px 16px;
  background: var(--card);
  text-align: center;
}

.quad .q-cell .glyph {
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 900;
  color: var(--teal);
}

.quad .q-cell .q-en {
  font-size: 10px;
  color: var(--ink-faint);
  letter-spacing: .25em;
  text-transform: uppercase;
  margin: 4px 0 10px;
}

.quad .q-cell p { font-size: 12px; color: var(--ink-dim); text-align: left; }

/* 联系方式 */
.contact-grid {
  display: grid;
  gap: 12px;
  margin-top: 26px;
  grid-template-columns: 1fr 1fr;
}

.contact-cell {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 16px;
  background: var(--card);
}

.contact-cell .c-lab { font-size: 11px; color: var(--ink-faint); letter-spacing: .15em; margin-bottom: 6px; }
.contact-cell .c-val { font-size: 14px; font-weight: 500; line-height: 1.6; }
.contact-cell .c-val small { display: block; font-size: 11.5px; color: var(--ink-dim); font-weight: 300; }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--line);
  margin-top: 64px;
  padding: 36px 0 8px;
  text-align: center;
}

.footer .f-quote {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ink-dim);
  letter-spacing: .1em;
}

.footer .f-mini {
  font-size: 11px;
  color: var(--ink-faint);
  margin-top: 14px;
  letter-spacing: .12em;
}

/* ---------- 动画 ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: none; }
}

@keyframes hint {
  0%, 100% { opacity: .3; transform: translateX(-50%) translateY(0); }
  50% { opacity: .9; transform: translateX(-50%) translateY(8px); }
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(53, 208, 197, .5); }
  60% { box-shadow: 0 0 0 8px rgba(53, 208, 197, 0); }
}

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page { padding-bottom: 64px; padding-top: 64px; }
  .topnav { display: flex; }
  .tabbar { display: none; }
  .wrap { padding: 0 44px; }
  .hero-inner { padding: 102px 0 90px; }
  .pillars { grid-template-columns: repeat(3, 1fr); gap: 18px; }
  .price-grid { grid-template-columns: repeat(3, 1fr); }
  .recap { grid-template-columns: repeat(3, 1fr); }
  .voices { grid-template-columns: 1fr 1fr; }
  .asset-grid { grid-template-columns: repeat(4, 1fr); }
  .concepts { grid-template-columns: 1fr 1fr; }
  .milestone { grid-template-columns: 1fr 1fr; }
  .quad { grid-template-columns: repeat(4, 1fr); }
  .contact-grid { grid-template-columns: repeat(4, 1fr); }
  .scroll-hint { bottom: 34px; }
}

@media (max-width: 560px) {
  .wrap { padding: 0 40px; }
  .hero-inner { padding: 70px 0 90px; }
  .article-item .a-date { width: 70px; }
}