/* ============================================================
   见度 GEO — 设计系统
   参考：Linear / Resend 的克制感 + 中文排版的可读性
   ============================================================ */

:root {
  /* 色彩 */
  --ink:        #0B0C0E;
  --ink-2:      #2E3138;
  --muted:      #6E737C;
  --faint:      #9BA0A8;
  --line:       rgba(11, 12, 14, .10);
  --line-2:     rgba(11, 12, 14, .06);
  --bg:         #FBFBF9;
  --bg-2:       #F3F2EE;
  --paper:      #EFEDE7;
  --dark:       #0B0C0E;
  --dark-2:     #14161A;
  --accent:     #E5461F;
  --accent-ink: #C33A18;
  --accent-bg:  rgba(229, 70, 31, .07);

  /* 排版 */
  --sans: "PingFang SC", "HarmonyOS Sans SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC",
          system-ui, -apple-system, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;

  /* 尺寸 */
  --wrap: 1180px;
  --wrap-narrow: 820px;
  --r-sm: 8px;
  --r:    14px;
  --r-lg: 22px;

  --ease: cubic-bezier(.22, 1, .36, 1);
}

* { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 32px;
}
.wrap-narrow { max-width: var(--wrap-narrow); }

/* ============ 通用按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: .01em;
  border: 1px solid var(--ink);
  cursor: pointer;
  transition: transform .18s var(--ease), background .18s, box-shadow .18s, color .18s;
  white-space: nowrap;
}
.btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 8px 22px -8px rgba(229, 70, 31, .55);
}
.btn-sm { padding: 9px 18px; font-size: 14.5px; }
.btn-lg { padding: 16px 32px; font-size: 17px; }
.btn-block { display: flex; width: 100%; margin-top: auto; }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
  box-shadow: none;
}
.btn-ghost:hover {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
  box-shadow: none;
}

/* ============ 导航 ============ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 14px 0;
  transition: background .3s, border-color .3s, backdrop-filter .3s;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(251, 251, 249, .82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom-color: var(--line);
}
.nav-in {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  gap: 40px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -.01em;
}
.brand-mark {
  width: 30px; height: 30px;
  display: grid; place-items: center;
  background: var(--ink);
  color: var(--accent);
  border-radius: 9px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
}
.nav-links {
  display: flex;
  gap: 28px;
  margin-left: auto;
  font-size: 15px;
  color: var(--muted);
}
.nav-links a { transition: color .18s; }
.nav-links a:hover { color: var(--ink); }

/* ---- 移动端菜单（桌面隐藏） ---- */
.nav-mobile { display: none; position: relative; margin-left: auto; }
.nav-mobile > summary {
  width: 44px;
  height: 44px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  list-style: none;
  border-radius: 10px;
  transition: background .18s;
}
.nav-mobile > summary::-webkit-details-marker { display: none; }
.nav-mobile > summary:hover { background: var(--bg-2); }
.nav-mobile > summary span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform .25s var(--ease), opacity .2s;
}
.nav-mobile[open] > summary span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-mobile[open] > summary span:nth-child(2) { opacity: 0; }
.nav-mobile[open] > summary span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-mobile-panel {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  min-width: 190px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: 0 20px 44px -18px rgba(11,12,14,.28);
  padding: 8px;
  display: flex;
  flex-direction: column;
  z-index: 200;
}
.nav-mobile-panel a {
  padding: 13px 16px;
  font-size: 15.5px;
  color: var(--ink-2);
  border-radius: 9px;
  transition: background .16s, color .16s;
  white-space: nowrap;
}
.nav-mobile-panel a:hover { background: var(--bg-2); color: var(--ink); }
.nav-mobile-panel a.is-cta {
  margin-top: 6px;
  background: var(--ink);
  color: #fff;
  font-weight: 600;
  text-align: center;
}
.nav-mobile-panel a.is-cta:hover { background: var(--accent); color: #fff; }

/* ============ Hero ============ */
.hero {
  padding: 88px 0 96px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 620px;
  background: radial-gradient(60% 60% at 50% 0%, rgba(229, 70, 31, .07), transparent 70%);
  pointer-events: none;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 72px;
  align-items: center;
  position: relative;
}
.eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(38px, 5vw, 60px);
  line-height: 1.18;
  letter-spacing: -.03em;
  font-weight: 800;
  margin: 0 0 26px;
}
.hero h1 em {
  font-style: normal;
  color: var(--accent);
}
.lead {
  font-size: 18px;
  color: var(--ink-2);
  line-height: 1.85;
  margin: 0 0 36px;
  max-width: 34em;
}
.lead strong { color: var(--ink); font-weight: 600; }

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  margin-top: 44px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--muted);
}
.hero-meta b {
  color: var(--ink);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  margin-right: 3px;
}

/* ---- AI 对话卡片 ---- */
.hero-visual { perspective: 1200px; }
.chat-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow:
    0 1px 2px rgba(11,12,14,.04),
    0 24px 60px -24px rgba(11,12,14,.22);
  overflow: hidden;
  transform: rotate(.6deg);
  transition: transform .5s var(--ease);
}
.chat-card:hover { transform: rotate(0deg) translateY(-4px); }

.chat-head {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 15px 20px;
  border-bottom: 1px solid var(--line-2);
  background: #FCFCFA;
}
.dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: #E4E2DC;
}
.chat-title {
  margin-left: 10px;
  font-size: 13px;
  color: var(--faint);
  font-weight: 600;
  letter-spacing: .06em;
}
.chat-body { padding: 24px 20px 8px; }

.bubble { border-radius: 16px; padding: 14px 17px; font-size: 15px; line-height: 1.7; }
.bubble.ask {
  background: var(--ink);
  color: #fff;
  margin-left: auto;
  width: fit-content;
  max-width: 88%;
  border-bottom-right-radius: 5px;
}
.bubble.reply {
  background: var(--bg-2);
  margin-top: 14px;
  border-bottom-left-radius: 5px;
  color: var(--ink-2);
}
.reply-lead { margin: 0 0 10px; }
.brand-list {
  margin: 0 0 10px;
  padding: 0;
  list-style: none;
  counter-reset: b;
}
.brand-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 0;
  border-bottom: 1px dashed rgba(11,12,14,.07);
  font-size: 14.5px;
}
.brand-list li:last-child { border-bottom: 0; }
.rank {
  width: 21px; height: 21px;
  flex: 0 0 21px;
  display: grid; place-items: center;
  border-radius: 6px;
  background: rgba(11,12,14,.07);
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.reply-note {
  margin: 0;
  font-size: 13.5px;
  color: var(--faint);
}
.chat-foot {
  padding: 16px 20px;
  background: var(--accent-bg);
  border-top: 1px solid rgba(229, 70, 31, .16);
  text-align: center;
}
.miss {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-ink);
  letter-spacing: .01em;
}

/* ============ Section 基础 ============ */
.section { padding: 108px 0; }
.section-paper { background: var(--bg-2); }
.section-dark { background: var(--dark); color: #EDEDEA; }
.section-dark .eyebrow { color: #FF7A55; }

.sec-head { max-width: 760px; margin-bottom: 64px; }
.sec-head h2 {
  font-size: clamp(30px, 3.6vw, 44px);
  line-height: 1.24;
  letter-spacing: -.025em;
  font-weight: 800;
  margin: 0;
}
.sec-sub {
  margin: 20px 0 0;
  font-size: 17.5px;
  color: var(--muted);
  line-height: 1.8;
}
.section-dark .sec-sub { color: #9A9A96; }

/* ============ 类比块 ============ */
.analogy {
  display: flex;
  gap: 30px;
  align-items: flex-start;
  padding: 40px 42px;
  background: var(--ink);
  border-radius: var(--r);
  color: #EDEDEA;
  margin-bottom: 56px;
}
.analogy-mark {
  flex: 0 0 auto;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .12em;
  color: #FF7A55;
  padding-top: 6px;
}
.analogy p {
  margin: 0;
  font-size: 19px;
  line-height: 1.85;
  color: #B8B8B3;
}
.analogy strong { color: #fff; font-weight: 700; }

/* ============ 时机说明 ============ */
.timing-note {
  margin: 56px 0 0;
  padding: 34px 38px;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--r);
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink-2);
}
.timing-note strong { color: var(--accent-ink); }

/* ============ 诊断样本 ============ */
.sample-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-bottom: 22px;
}
.sample-card {
  padding: 38px 32px 32px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  transition: transform .3s var(--ease), box-shadow .3s;
}
.sample-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 44px -26px rgba(11,12,14,.25);
}
.sample-k {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--accent);
  margin-bottom: 16px;
}
.sample-card h3 {
  font-size: 22px;
  margin: 0 0 14px;
  letter-spacing: -.015em;
  font-weight: 700;
}
.sample-card p {
  margin: 0 0 24px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}
.sample-out {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 20px;
  border-top: 1px solid var(--line-2);
}
.tag {
  font-size: 12.5px;
  font-weight: 600;
  padding: 5px 11px;
  border-radius: 999px;
  background: var(--bg-2);
  color: var(--ink-2);
  letter-spacing: .01em;
}

/* ============ 无案例说明 ============ */
.no-case {
  display: flex;
  gap: 26px;
  align-items: flex-start;
  padding: 36px 38px;
  background: var(--accent-bg);
  border: 1px solid rgba(229, 70, 31, .22);
  border-radius: var(--r);
}
.no-case-mark {
  flex: 0 0 auto;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--accent);
  padding-top: 5px;
}
.no-case h3 {
  font-size: 19px;
  margin: 0 0 12px;
  font-weight: 700;
}
.no-case p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
}
.no-case strong { color: var(--accent-ink); }

/* ============ 主理人 ============ */
.about {
  display: flex;
  gap: 34px;
  align-items: flex-start;
}
.about-avatar {
  flex: 0 0 auto;
  width: 92px; height: 92px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--ink);
  color: var(--accent);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
}
.about-body h2 {
  font-size: 30px;
  margin: 4px 0 4px;
  letter-spacing: -.02em;
  font-weight: 800;
}
.about-role {
  font-size: 14.5px !important;
  color: var(--accent) !important;
  font-weight: 600;
  margin: 0 0 22px !important;
}
.about-body p {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--ink-2);
}
.about-body p:last-child { margin-bottom: 0; }

/* ============ 对比 ============ */
.compare {
  display: grid;
  grid-template-columns: 1fr 54px 1fr;
  gap: 0;
  align-items: stretch;
  margin-bottom: 88px;
}
.compare-col {
  padding: 36px 34px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: #fff;
}
.compare-col.is-now {
  border-color: rgba(229, 70, 31, .3);
  background: linear-gradient(180deg, #fff, var(--accent-bg));
  box-shadow: 0 20px 50px -30px rgba(229, 70, 31, .5);
}
.compare-tag {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--faint);
  margin-bottom: 14px;
}
.is-now .compare-tag { color: var(--accent); }
.compare-col h3 {
  font-size: 23px;
  margin: 0 0 22px;
  letter-spacing: -.02em;
  font-weight: 700;
}
.compare-col ul { margin: 0; padding: 0; list-style: none; }
.compare-col li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 14px;
  font-size: 15.5px;
  color: var(--ink-2);
  line-height: 1.7;
}
.compare-col li::before {
  content: "";
  position: absolute;
  left: 0; top: .72em;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--line);
}
.is-now li::before { background: var(--accent); }
.compare-col li strong { color: var(--ink); font-weight: 600; }
.compare-arrow {
  display: grid;
  place-items: center;
  font-size: 22px;
  color: var(--faint);
  font-weight: 300;
}

/* ============ 数据条 ============ */
.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r);
  overflow: hidden;
}
.stat {
  background: var(--bg);
  padding: 38px 34px;
}
.stat-num {
  font-size: clamp(38px, 4.4vw, 54px);
  font-weight: 800;
  letter-spacing: -.04em;
  line-height: 1;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.stat-num span { font-size: .42em; font-weight: 700; margin-left: 2px; }
.stat-label {
  margin-top: 16px;
  font-size: 14.5px;
  color: var(--muted);
  line-height: 1.65;
}

/* ============ 步骤 ============ */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.10);
  border-radius: var(--r);
  overflow: hidden;
}
.step {
  padding: 40px 30px 34px;
  background: var(--dark);
  display: flex;
  flex-direction: column;
}
.step-num {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  color: #FF7A55;
  letter-spacing: .08em;
  margin-bottom: 26px;
}
.step h3 {
  font-size: 21px;
  margin: 0 0 14px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: #fff;
}
.step p {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.78;
  color: #9A9A96;
}
.step-out {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid rgba(255,255,255,.10);
  font-size: 13px;
  color: #6E6E6B;
  letter-spacing: .01em;
}

/* ============ 证据 ============ */
.proof-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  margin-bottom: 26px;
}
.proof-card {
  padding: 40px 38px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: #fff;
}
.proof-card.is-positive {
  border-color: rgba(229, 70, 31, .3);
  background: linear-gradient(180deg, #fff, var(--accent-bg));
}
.proof-k {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--faint);
  margin-bottom: 16px;
}
.is-positive .proof-k { color: var(--accent); }
.proof-card h3 {
  font-size: 22px;
  margin: 0 0 16px;
  line-height: 1.4;
  letter-spacing: -.015em;
  font-weight: 700;
}
.proof-card p {
  margin: 0;
  font-size: 15.5px;
  color: var(--muted);
  line-height: 1.8;
}

.self-proof {
  display: flex;
  gap: 26px;
  align-items: flex-start;
  padding: 36px 38px;
  background: var(--ink);
  border-radius: var(--r);
  color: #EDEDEA;
}
.self-proof-mark {
  flex: 0 0 auto;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .12em;
  color: #FF7A55;
  padding-top: 5px;
}
.self-proof h3 {
  font-size: 20px;
  margin: 0 0 12px;
  font-weight: 700;
  color: #fff;
}
.self-proof p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: #9A9A96;
}
.self-proof code {
  font-family: var(--mono);
  font-size: .92em;
  background: rgba(255,255,255,.09);
  padding: 2px 6px;
  border-radius: 5px;
  color: #EDEDEA;
}

/* ============ 报价 ============ */
.price-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  align-items: stretch;
}
.price-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 34px 24px 26px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  transition: transform .3s var(--ease), box-shadow .3s;
}
.price-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 50px -28px rgba(11,12,14,.28);
}
.price-card.is-featured {
  border-color: var(--ink);
  box-shadow: 0 24px 60px -30px rgba(11,12,14,.4);
}
.price-badge {
  position: absolute;
  top: -12px;
  left: 24px;
  background: var(--accent);
  color: #fff;
  font-size: 11.5px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  letter-spacing: .02em;
  white-space: nowrap;
}
.price-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: .04em;
  margin-bottom: 12px;
}
.price-num {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -.04em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.price-num span {
  font-size: 16px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0;
  margin-left: 3px;
}
.price-term {
  margin-top: 10px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--accent-ink);
  letter-spacing: .01em;
}
.price-desc {
  margin-top: 8px;
  font-size: 14.5px;
  color: var(--faint);
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line-2);
  margin-bottom: 22px;
}
.price-card ul {
  margin: 0 0 30px;
  padding: 0;
  list-style: none;
  flex: 1;
}
.price-card li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 11px;
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.6;
}
.price-card li::before {
  content: "✓";
  position: absolute;
  left: 0; top: 0;
  color: var(--accent);
  font-weight: 700;
  font-size: 14px;
}
.price-card li strong { color: var(--accent-ink); font-weight: 700; }

/* ============ 场景时间线（焦虑段） ============ */
.scene {
  max-width: 720px;
  border-left: 2px solid rgba(255,255,255,.12);
  padding-left: 0;
  margin-bottom: 46px;
}
.scene-row {
  display: flex;
  gap: 22px;
  align-items: baseline;
  padding: 16px 0 16px 26px;
  border-bottom: 1px solid rgba(255,255,255,.07);
  position: relative;
}
.scene-row::before {
  content: "";
  position: absolute;
  left: -5px; top: 26px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #4A4A4A;
}
.scene-row:last-child { border-bottom: 0; }
.scene-time {
  flex: 0 0 58px;
  font-family: var(--mono);
  font-size: 14px;
  color: #6E6E6B;
  letter-spacing: .03em;
}
.scene-text {
  font-size: 17px;
  color: #B8B8B3;
  line-height: 1.7;
}
.scene-row.is-loss::before { background: var(--accent); }
.scene-row.is-loss .scene-time { color: var(--accent); }
.scene-row.is-loss .scene-text {
  color: #fff;
  font-size: 19px;
  font-weight: 700;
}

.loss p {
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.9;
  color: #9A9A96;
  max-width: 42em;
}
.loss p strong { color: #fff; }
.loss-q {
  margin-top: 30px !important;
  padding: 26px 30px;
  background: rgba(229, 70, 31, .10);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r) var(--r) 0;
  font-size: 18px !important;
  color: #D8D8D4 !important;
  line-height: 1.85 !important;
}
.loss-q strong { color: #FF8F6B !important; }

/* ============ 渠道对比（抖音 vs AI） ============ */
.channel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  margin-bottom: 26px;
}
.channel-col {
  padding: 34px 32px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
}
.channel-col.is-key {
  border-color: rgba(229, 70, 31, .3);
  background: linear-gradient(180deg, #fff 50%, var(--accent-bg));
}
.channel-k {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--faint);
  margin-bottom: 14px;
}
.channel-col.is-key .channel-k { color: var(--accent); }
.channel-col h3 {
  font-size: 22px;
  margin: 0 0 20px;
  letter-spacing: -.015em;
  font-weight: 700;
}
.channel-col ul { margin: 0; padding: 0; list-style: none; }
.channel-col li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 12px;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--ink-2);
}
.channel-col li::before {
  content: "";
  position: absolute;
  left: 0; top: .7em;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--line);
}
.channel-col.is-key li::before { background: var(--accent); }
.channel-col li strong { color: var(--ink); }

.channel-key {
  padding: 30px 34px;
  background: var(--ink);
  border-radius: var(--r);
  margin-bottom: 26px;
}
.channel-key p {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.8;
  color: #9A9A96;
}
.channel-key p:last-child { margin-bottom: 0; }
.channel-key strong { color: #fff; }

/* ============ 自己做门槛 ============ */
.diy-box {
  padding: 38px 36px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
}
.diy-box h3 {
  font-size: 22px;
  margin: 0 0 8px;
  letter-spacing: -.015em;
  font-weight: 700;
}
.diy-lead {
  margin: 0 0 28px;
  font-size: 15.5px;
  color: var(--muted);
}
.diy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.diy-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.diy-no {
  flex: 0 0 26px;
  width: 26px; height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  margin-top: 2px;
}
.diy-item b {
  display: block;
  font-size: 16px;
  margin-bottom: 6px;
  color: var(--ink);
}
.diy-item span {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ============ 三件套服务 ============ */
.svc-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-bottom: 28px;
}
.svc-card {
  position: relative;
  padding: 40px 32px 34px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  transition: transform .3s var(--ease), box-shadow .3s;
}
.svc-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 22px 46px -28px rgba(11,12,14,.26);
}
.svc-card.is-key {
  border-color: rgba(229, 70, 31, .32);
  background: linear-gradient(180deg, #fff 55%, var(--accent-bg));
}
.svc-no {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: .08em;
  margin-bottom: 20px;
}
.svc-card h3 {
  font-size: 24px;
  margin: 0 0 8px;
  letter-spacing: -.02em;
  font-weight: 800;
}
.svc-what {
  font-size: 15px !important;
  color: var(--accent-ink) !important;
  font-weight: 600;
  margin: 0 0 18px !important;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-2);
}
.svc-why {
  margin: 0 0 22px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}
.svc-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.svc-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.6;
}
.svc-list li::before {
  content: "";
  position: absolute;
  left: 0; top: .68em;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.deliver {
  display: flex;
  gap: 26px;
  align-items: flex-start;
  padding: 32px 38px;
  background: var(--ink);
  border-radius: var(--r);
}
.deliver-mark {
  flex: 0 0 auto;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .12em;
  color: #FF7A55;
  padding-top: 5px;
}
.deliver p {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.85;
  color: #9A9A96;
}
.deliver strong { color: #fff; }

/* ============ 逻辑三段 ============ */
/* ============ 逻辑三段（嵌在服务区内的深色卡） ============ */
.logic-wrap {
  padding: 46px 42px;
  background: var(--dark);
  border-radius: var(--r);
  margin-bottom: 22px;
}
.logic-title {
  font-size: 23px;
  font-weight: 800;
  letter-spacing: -.02em;
  color: #fff;
  margin: 0 0 8px;
}
.logic-sub {
  font-size: 15.5px;
  color: #9A9A96;
  margin: 0 0 30px;
}

.logic {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.10);
  border-radius: var(--r);
  overflow: hidden;
}
.logic-row {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 26px 34px;
  background: var(--dark);
}
.logic-row.is-good { background: rgba(229, 70, 31, .12); }
.logic-case {
  flex: 0 0 200px;
  font-size: 16.5px;
  font-weight: 700;
  color: #fff;
}
.logic-result {
  font-size: 16px;
  color: #9A9A96;
}
.logic-result.bad::before {
  content: "→  ";
  color: #6E6E6B;
}
.logic-result.good {
  color: #FF8F6B;
  font-weight: 600;
}
.logic-result.good::before {
  content: "→  ";
  color: #FF8F6B;
}
.logic-note {
  margin: 40px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: #9A9A96;
  max-width: 46em;
}

/* ============ 价格补充说明 ============ */
.price-note {
  margin-top: 30px;
  padding: 26px 32px;
  background: var(--bg-2);
  border-radius: var(--r);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-2);
}
.price-note b { color: var(--ink); }

.diagnose-free {
  display: flex;
  gap: 26px;
  align-items: flex-start;
  margin-top: 22px;
  padding: 34px 38px;
  background: var(--accent-bg);
  border: 1px solid rgba(229, 70, 31, .22);
  border-radius: var(--r);
}
.diagnose-free-mark {
  flex: 0 0 auto;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--accent);
  padding-top: 5px;
}
.diagnose-free h3 {
  font-size: 19px;
  margin: 0 0 10px;
  font-weight: 700;
}
.diagnose-free p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-2);
}

/* ============ 发布节奏卡片（移动端专用，桌面隐藏） ============ */
.price-stack { display: none; }

.stack-card {
  padding: 24px 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
  margin-bottom: 14px;
}
.stack-card.is-featured {
  border-color: rgba(229, 70, 31, .32);
  background: linear-gradient(180deg, #fff 60%, var(--accent-bg));
}
.stack-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 16px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--line-2);
}
.stack-name {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
}
.stack-price {
  margin-left: auto;
  font-size: 21px;
  font-weight: 800;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.stack-badge {
  font-size: 11.5px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
}
.stack-list { margin: 0; padding: 0; }
.stack-list > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-2);
}
.stack-list > div:last-child { border-bottom: 0; }
.stack-list dt {
  font-size: 14.5px;
  color: var(--muted);
  flex: 0 0 auto;
}
.stack-list dd {
  margin: 0;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.stack-list dd.is-none { color: var(--faint); font-weight: 400; }

/* ============ 二维码 ============ */
.qr-block {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  margin: 44px auto 0;
  padding: 22px 26px;
  max-width: 460px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.10);
  border-radius: var(--r);
  text-align: left;
}
.qr-box {
  position: relative;
  flex: 0 0 auto;
  width: 180px;
  height: 180px;
  background: #fff;
  border-radius: 10px;
  overflow: hidden;
  display: grid;
  place-items: center;
}
.qr-box img { width: 100%; height: 100%; object-fit: contain; }
.qr-placeholder {
  display: none;
  font-size: 13px;
  color: var(--faint);
  letter-spacing: .08em;
}
.qr-box.qr-empty img { display: none; }
.qr-box.qr-empty .qr-placeholder { display: block; }
.qr-text { display: flex; flex-direction: column; gap: 7px; }
.qr-text b { font-size: 16.5px; color: #fff; }
.qr-text span { font-size: 14px; color: #9A9A96; line-height: 1.6; }
.qr-id { color: #FF8F6B !important; font-weight: 600; }

/* 深色区块内的浅色卡适配 */
.section-dark .stat-row {
  background: rgba(255,255,255,.10);
  border-color: rgba(255,255,255,.10);
}
.section-dark .stat { background: rgba(255,255,255,.03); }
.section-dark .stat-label { color: #9A9A96; }
.section-dark .timing-note {
  background: rgba(255,255,255,.05);
  border-color: rgba(255,255,255,.10);
  border-left-color: var(--accent);
  color: #B8B8B3;
}
.section-dark .timing-note strong { color: #FF8F6B; }

/* ============ 报价对比表 ============ */
.price-table-wrap {
  margin-top: 56px;
  padding: 38px 36px 30px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r);
}
.price-table-title {
  font-size: 19px;
  font-weight: 700;
  margin: 0 0 26px;
  letter-spacing: -.01em;
}
.price-table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0 -6px;
  padding: 0 6px;
}
.price-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  min-width: 640px;
}
.price-table th,
.price-table td {
  padding: 13px 16px;
  text-align: center;
  border-bottom: 1px solid var(--line-2);
  white-space: nowrap;
}
.price-table th {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--muted);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}
.price-table th:first-child,
.price-table td:first-child {
  text-align: left;
  color: var(--ink-2);
  font-weight: 500;
  position: sticky;
  left: 0;
  background: #fff;
  z-index: 1;
}
.price-table tbody tr:last-child td { border-bottom: 0; }
.price-table .hl {
  background: var(--accent-bg);
  font-weight: 700;
  color: var(--ink);
}
.price-table th.hl { color: var(--accent); }
.price-table .yes { color: var(--accent); font-weight: 700; }
.price-table .no { color: var(--faint); }

/* ============ FAQ ============ */
.faq { border-top: 1px solid var(--line); }
.faq details {
  border-bottom: 1px solid var(--line);
  padding: 4px 0;
}
.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 24px 44px 24px 0;
  font-size: 18px;
  font-weight: 600;
  position: relative;
  letter-spacing: -.01em;
  transition: color .2s;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--accent); }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 8px; top: 50%;
  transform: translateY(-50%);
  font-size: 24px;
  font-weight: 300;
  color: var(--faint);
  transition: transform .25s var(--ease), color .2s;
}
.faq details[open] summary::after {
  content: "−";
  color: var(--accent);
}
.faq details p {
  margin: 0;
  padding: 0 44px 28px 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

/* ============ 联系 ============ */
.contact { text-align: center; }
.contact h2 {
  font-size: clamp(30px, 3.6vw, 44px);
  line-height: 1.24;
  letter-spacing: -.025em;
  font-weight: 800;
  margin: 0 0 22px;
  color: #fff;
}
.section-dark .contact .eyebrow { color: #FF7A55; }
.contact-lead {
  font-size: 17.5px;
  color: #9A9A96;
  line-height: 1.85;
  max-width: 34em;
  margin: 0 auto 40px;
}
.contact-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}
.section-dark .btn {
  background: #fff;
  color: var(--ink);
  border-color: #fff;
}
.section-dark .btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.section-dark .btn-ghost {
  background: transparent;
  color: #EDEDEA;
  border-color: rgba(255,255,255,.22);
}
.section-dark .btn-ghost:hover {
  background: #fff;
  color: var(--ink);
  border-color: #fff;
}
.contact-note {
  margin-top: 30px;
  font-size: 14px;
  color: #6E6E6B;
  letter-spacing: .01em;
}

/* ============ Footer ============ */
.foot {
  background: #08090A;
  color: #8A8A86;
  padding: 68px 0 30px;
  font-size: 14.5px;
}
.foot-in {
  display: flex;
  justify-content: space-between;
  gap: 60px;
  flex-wrap: wrap;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.foot-brand { display: flex; gap: 12px; align-items: flex-start; }
.foot-name { color: #EDEDEA; font-weight: 700; font-size: 16px; }
.foot-desc { font-size: 13.5px; color: #6E6E6B; margin-top: 3px; }
.foot-cols { display: flex; gap: 72px; flex-wrap: wrap; }
.foot-h {
  color: #EDEDEA;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  margin-bottom: 12px;
}
.foot-cols a { display: block; transition: color .18s; }
.foot-cols a:hover { color: var(--accent); }
.foot-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  padding-top: 26px;
  font-size: 13px;
  color: #55565A;
}

/* ============ 动效 ============ */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .chat-card { transform: none; }
}

/* ============ 响应式 ============ */
@media (max-width: 1100px) {
  .price-grid { grid-template-columns: 1fr; }
  .svc-grid { grid-template-columns: 1fr; }
}

@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: 1fr; gap: 56px; }
  .hero-visual { max-width: 460px; }
  .steps { grid-template-columns: 1fr 1fr; }
  .compare { grid-template-columns: 1fr; gap: 16px; }
  .compare-arrow { transform: rotate(90deg); padding: 4px 0; }
  .analogy { flex-direction: column; gap: 12px; padding: 32px 28px; }
  .about { flex-direction: column; gap: 22px; }
  .logic-row { flex-direction: column; align-items: flex-start; gap: 8px; }
  .logic-case { flex: none; }
  .channel { grid-template-columns: 1fr; }
  .diy-grid { grid-template-columns: 1fr; gap: 20px; }
  .logic-wrap { padding: 36px 28px; }
  .channel-key { padding: 26px 26px; }
  .svc-card { padding: 32px 26px 28px; }
  .scene { max-width: 100%; }
  .deliver { flex-direction: column; gap: 10px; }
  .diagnose-free { flex-direction: column; gap: 10px; }
  .no-case { flex-direction: column; gap: 10px; }
  .foot-cols { gap: 40px; }
}

@media (max-width: 720px) {
  .wrap, .nav-in { padding: 0 20px; }
  .nav-links { display: none; }
  .nav-in { gap: 16px; }
  .nav-mobile { display: block; }
  .nav-cta { display: none; }

  /* 触控尺寸：按钮至少 44px 高 */
  .btn-sm { padding: 11px 20px; font-size: 15px; min-height: 44px; }
  .btn { min-height: 46px; }

  .hero { padding: 56px 0 64px; }
  .section { padding: 64px 0; }
  .hero-meta { gap: 14px 20px; margin-top: 34px; }
  .sec-head { margin-bottom: 40px; }

  /* 单列布局 */
  .stat-row { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .proof-grid { grid-template-columns: 1fr; }
  .price-grid { grid-template-columns: 1fr; }
  .sample-grid { grid-template-columns: 1fr; }
  .svc-grid { grid-template-columns: 1fr; }
  .channel { grid-template-columns: 1fr; }
  .diy-grid { grid-template-columns: 1fr; gap: 20px; }
  .foot-in { flex-direction: column; gap: 32px; }
  .foot-cols { gap: 32px; }

  /* 收窄内边距 */
  .compare-col { padding: 28px 22px; }
  .stat { padding: 28px 22px; }
  .step { padding: 30px 22px 26px; }
  .proof-card { padding: 30px 22px; }
  .price-card { padding: 30px 22px 26px; }
  .sample-card { padding: 30px 22px 26px; }
  .svc-card { padding: 30px 22px 26px; }
  .channel-col { padding: 28px 22px; }
  .logic-wrap { padding: 32px 22px; }
  .channel-key { padding: 26px 22px; }
  .timing-note { padding: 26px 22px; font-size: 16px; }
  .no-case { flex-direction: column; gap: 12px; padding: 26px 22px; }
  .deliver { flex-direction: column; gap: 12px; padding: 26px 22px; }
  .diagnose-free { flex-direction: column; gap: 12px; padding: 26px 22px; }
  .self-proof { flex-direction: column; gap: 12px; padding: 28px 22px; }
  .price-note { padding: 22px 22px; font-size: 15px; }
  .price-table-wrap { display: none; }
  .price-stack { display: block; }
  .price-stack .price-table-title { margin-bottom: 18px; }
  .qr-block {
    flex-direction: column;
    gap: 16px;
    padding: 22px 20px;
    margin-top: 32px;
    text-align: center;
    max-width: 100%;
  }
  .qr-text { align-items: center; }
  .qr-box { width: 190px; height: 190px; }
  .faq summary { padding: 22px 40px 22px 0; font-size: 16.5px; }
  .faq details p { padding: 0 0 24px 0; font-size: 15.5px; }

  /* 字号上调：40–55 岁客户的可读性 */
  body { font-size: 16px; }
  .lead { font-size: 17px; }
  .svc-why { font-size: 15.5px; }
  .svc-list li { font-size: 15.5px; }
  .price-card li { font-size: 15px; }
  .channel-col li { font-size: 15.5px; }
  .compare-col li { font-size: 15.5px; }
  .step p { font-size: 15.5px; }
  .proof-card p { font-size: 15.5px; }
  .stat-label { font-size: 15px; }
  .deliver p, .diagnose-free p { font-size: 15.5px; }
  .logic-note { font-size: 15.5px; }
  .diy-item span { font-size: 15px; }

  .analogy p { font-size: 17px; }
  .about-avatar { width: 72px; height: 72px; font-size: 27px; }
  .about-body h2 { font-size: 26px; }
  .scene-text { font-size: 16.5px; }
  .scene-row.is-loss .scene-text { font-size: 18px; }
  .loss p { font-size: 16.5px; }
  .loss-q { font-size: 17px !important; padding: 22px 22px; }
  .logic-title { font-size: 20px; }
  .logic-sub { font-size: 15.5px; }
}

/* ============================================================
   背景音乐按钮
   ============================================================ */
.bgm-btn {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 90;
  width: 46px;
  height: 46px;
  padding: 0;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(11, 12, 14, .70);
  border: 1px solid rgba(255, 255, 255, .18);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 8px 24px rgba(11, 12, 14, .24);
  cursor: pointer;
  transition: transform .22s var(--ease), background .22s var(--ease), border-color .22s var(--ease);
}
.bgm-btn:hover {
  transform: translateY(-2px);
  background: rgba(11, 12, 14, .88);
  border-color: rgba(229, 70, 31, .55);
}
.bgm-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.bgm-bars {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 15px;
}
.bgm-bars i {
  display: block;
  width: 3px;
  height: 5px;
  border-radius: 2px;
  background: #FBFBF9;
}
/* 播放中：跳动；未播放：静止矮条 + 斜杠 */
.bgm-btn.is-on .bgm-bars i {
  animation: bgm-bar 1.05s ease-in-out infinite;
}
.bgm-btn.is-on .bgm-bars i:nth-child(2) { animation-delay: .18s; }
.bgm-btn.is-on .bgm-bars i:nth-child(3) { animation-delay: .36s; }

.bgm-slash {
  position: absolute;
  width: 25px;
  height: 1.5px;
  border-radius: 2px;
  background: #FBFBF9;
  transform: rotate(-45deg);
  transition: opacity .18s var(--ease);
}
.bgm-btn.is-on .bgm-slash { opacity: 0; }

@keyframes bgm-bar {
  0%, 100% { height: 4px; }
  50%      { height: 15px; }
}

@media (max-width: 720px) {
  .bgm-btn { right: 14px; bottom: 14px; width: 44px; height: 44px; }
}

@media (prefers-reduced-motion: reduce) {
  .bgm-btn.is-on .bgm-bars i { animation: none; height: 9px; }
  .bgm-btn { transition: none; }
}