/* =========================================================
   概率24 · GEO 官网
   设计系统 / Design tokens
   ========================================================= */

:root {
  --red: #e0301e;
  --red-deep: #b31d12;
  --red-soft: #fdece9;
  --ink: #12100e;
  --ink-2: #1c1917;
  --paper: #fbf8f4;
  --white: #ffffff;
  --muted: #6d645c;
  --muted-2: #8c837b;
  --line: rgba(18, 16, 14, 0.12);
  --line-soft: rgba(18, 16, 14, 0.07);
  --line-dark: rgba(255, 255, 255, 0.14);

  --font: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei",
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", "Roboto Mono", Menlo, Consolas, monospace;

  --container: 1180px;
  --radius: 18px;
  --radius-sm: 10px;

  --shadow-sm: 0 1px 2px rgba(18, 16, 14, 0.05), 0 8px 24px rgba(18, 16, 14, 0.04);
  --shadow-md: 0 2px 4px rgba(18, 16, 14, 0.04), 0 18px 50px rgba(18, 16, 14, 0.08);
  --shadow-lg: 0 30px 90px rgba(18, 16, 14, 0.16);

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
svg {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
figure,
blockquote {
  margin: 0;
}

ul,
ol {
  padding-left: 1.15em;
}

h1,
h2,
h3,
h4 {
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.18;
}

strong {
  font-weight: 650;
}

::selection {
  background: var(--red);
  color: #fff;
}

/* ---------- 布局 ---------- */

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

.container--wide {
  max-width: 1320px;
}

.section {
  padding: clamp(64px, 9vw, 128px) 0;
  position: relative;
}

.section--tight {
  padding: clamp(48px, 6vw, 80px) 0;
}

.section--white {
  background: var(--white);
}

.section--paper {
  background: var(--paper);
}

.section--ink {
  background: var(--ink);
  color: #f5f1ec;
}

.section--red {
  background: var(--red);
  color: #fff;
}

.section--ink h2,
.section--ink h3 {
  color: #fff;
}

.rule {
  height: 1px;
  background: var(--line);
  border: 0;
  margin: 0;
}

/* ---------- 页头 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(251, 248, 244, 0.82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 76px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: none;
}

.brand__mark {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: var(--red);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.04em;
  box-shadow: 0 6px 18px rgba(224, 48, 30, 0.28);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand__name {
  font-size: 17px;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.brand__sub {
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--muted-2);
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav a {
  padding: 8px 13px;
  border-radius: 999px;
  font-size: 14.5px;
  color: #3a342f;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.nav a:hover {
  background: rgba(18, 16, 14, 0.055);
}

.nav a[aria-current="page"] {
  color: var(--red);
  font-weight: 600;
}

.header__cta {
  flex: none;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: transparent;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  margin-left: auto;
}

.nav-toggle span {
  position: relative;
  width: 17px;
  height: 1.5px;
  background: var(--ink);
  display: block;
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 17px;
  height: 1.5px;
  background: var(--ink);
}

.nav-toggle span::before {
  top: -5px;
}

.nav-toggle span::after {
  top: 5px;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease),
    color 0.2s var(--ease), box-shadow 0.25s var(--ease), border-color 0.2s;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn--primary {
  background: var(--red);
  color: #fff;
  box-shadow: 0 10px 26px rgba(224, 48, 30, 0.24);
}

.btn--primary:hover {
  background: var(--red-deep);
}

.btn--ink {
  background: var(--ink);
  color: #fff;
}

.btn--ink:hover {
  background: #000;
}

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

.btn--ghost:hover {
  border-color: var(--ink);
}

.btn--light {
  background: #fff;
  color: var(--ink);
}

.btn--outline-light {
  border-color: rgba(255, 255, 255, 0.45);
  color: #fff;
}

.btn--outline-light:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.btn--sm {
  height: 40px;
  padding: 0 18px;
  font-size: 14px;
}

.btn__arrow {
  transition: transform 0.25s var(--ease);
}

.btn:hover .btn__arrow {
  transform: translateX(3px);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--red);
}

.link-arrow svg {
  transition: transform 0.25s var(--ease);
}

.link-arrow:hover svg {
  transform: translateX(3px);
}

/* ---------- 排版组件 ---------- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 18px;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}

.section--ink .eyebrow {
  color: #ff8a7a;
}

.h1 {
  font-size: clamp(38px, 6.4vw, 76px);
  font-weight: 650;
  letter-spacing: -0.035em;
  line-height: 1.06;
}

.h2 {
  font-size: clamp(30px, 4.2vw, 50px);
  letter-spacing: -0.03em;
  line-height: 1.12;
}

.h3 {
  font-size: clamp(20px, 2vw, 24px);
  letter-spacing: -0.02em;
}

.lead {
  font-size: clamp(16.5px, 1.5vw, 19px);
  line-height: 1.8;
  color: var(--muted);
}

.section--ink .lead,
.section--red .lead {
  color: rgba(255, 255, 255, 0.72);
}

.small {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted-2);
}

.mono {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-head {
  max-width: 760px;
  margin-bottom: clamp(36px, 5vw, 60px);
}

.section-head--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-head .lead {
  margin-top: 20px;
}

.text-red {
  color: var(--red);
}

/* ---------- 首屏 ---------- */

.hero {
  position: relative;
  background: var(--ink);
  color: #fff;
  overflow: hidden;
  padding: clamp(64px, 8vw, 104px) 0 clamp(56px, 7vw, 92px);
}

.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto auto;
  width: 70vw;
  height: 70vw;
  max-width: 920px;
  max-height: 920px;
  background: radial-gradient(
    circle at 50% 50%,
    rgba(224, 48, 30, 0.34),
    rgba(224, 48, 30, 0.06) 46%,
    transparent 70%
  );
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(circle at 70% 20%, #000, transparent 68%);
  -webkit-mask-image: radial-gradient(circle at 70% 20%, #000, transparent 68%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  height: 32px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.05);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.82);
  margin-bottom: 26px;
}

.hero__badge i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #3ddc84;
  box-shadow: 0 0 0 4px rgba(61, 220, 132, 0.16);
}

.hero h1 {
  font-size: clamp(34px, 4.4vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.035em;
  font-weight: 650;
}

.hero h1 em {
  font-style: normal;
  color: #ff6b5a;
}

.hero__lead {
  margin-top: 26px;
  max-width: 520px;
  font-size: clamp(16px, 1.6vw, 18.5px);
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.72);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 36px;
}

.hero__note {
  margin-top: 22px;
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.42);
}

/* AI 回答卡 */

.answer-card {
  background: rgba(255, 255, 255, 0.985);
  color: var(--ink);
  border-radius: 20px;
  padding: 22px;
  box-shadow: var(--shadow-lg);
  position: relative;
  transform: rotate(-0.6deg);
}

.answer-card__bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted-2);
  text-transform: uppercase;
}

.answer-card__dots {
  display: flex;
  gap: 5px;
}

.answer-card__dots i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(18, 16, 14, 0.12);
}

.answer-card__q {
  margin: 16px 0 4px;
  font-size: 14.5px;
  font-weight: 600;
  color: #2a2521;
}

.answer-card__meta {
  font-size: 11.5px;
  color: var(--muted-2);
}

.answer-card__list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  gap: 8px;
}

.answer-card__list li {
  display: flex;
  gap: 11px;
  align-items: flex-start;
  padding: 11px 13px;
  border-radius: 11px;
  background: #f7f4f0;
  font-size: 13.5px;
  line-height: 1.55;
}

.answer-card__list li b {
  font-weight: 600;
}

.answer-card__list li span.num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted-2);
  padding-top: 2px;
}

.answer-card__list li.is-brand {
  background: var(--red-soft);
  border: 1px solid rgba(224, 48, 30, 0.28);
}

.answer-card__list li.is-brand .num,
.answer-card__list li.is-brand b {
  color: var(--red);
}

.answer-card__tag {
  margin-left: auto;
  flex: none;
  font-size: 10.5px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--red);
  color: #fff;
  letter-spacing: 0.04em;
}

.answer-card__foot {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 11px;
  color: var(--muted-2);
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

/* ---------- 数据条 ---------- */

.statbar {
  border-top: 1px solid var(--line-dark);
  margin-top: clamp(44px, 6vw, 72px);
  padding-top: 30px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
  z-index: 1;
}

.stat__num {
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 650;
  letter-spacing: -0.03em;
  line-height: 1;
}

.stat__num small {
  font-size: 0.45em;
  font-weight: 500;
  letter-spacing: 0;
  margin-left: 4px;
  color: rgba(255, 255, 255, 0.5);
}

.stat__label {
  margin-top: 10px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.58);
  line-height: 1.6;
}

.stat__src {
  margin-top: 4px;
  font-size: 10.5px;
  color: rgba(255, 255, 255, 0.3);
}

/* ---------- 通用网格 ---------- */

.grid {
  display: grid;
  gap: 22px;
}

.grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 6vw, 80px);
  align-items: start;
}

/* ---------- 卡片 ---------- */

.card {
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease),
    border-color 0.3s var(--ease);
}

.card--hover:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--line);
}

.card__index {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--red);
  letter-spacing: 0.14em;
}

.card h3 {
  margin: 12px 0 10px;
}

.card p {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.card__foot {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  color: var(--muted-2);
}

.card--dark {
  background: var(--ink-2);
  border-color: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.78);
  box-shadow: none;
}

.card--dark h3 {
  color: #fff;
}

.card--dark p {
  color: rgba(255, 255, 255, 0.6);
}

.card--dark .card__foot {
  border-top-color: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.42);
}

/* 定义块 */

.definition {
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 4px solid var(--red);
  border-radius: var(--radius-sm);
  padding: clamp(24px, 3vw, 36px);
  box-shadow: var(--shadow-sm);
}

.definition__label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--red);
  margin-bottom: 12px;
}

.definition p {
  font-size: clamp(16px, 1.7vw, 19px);
  line-height: 1.85;
}

.definition p + p {
  margin-top: 14px;
  font-size: 14.5px;
  color: var(--muted);
}

/* ---------- 表格 ---------- */

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--white);
  box-shadow: var(--shadow-sm);
  -webkit-overflow-scrolling: touch;
}

table.data {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
  font-size: 14px;
}

table.data th,
table.data td {
  text-align: left;
  padding: 15px 20px;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
  line-height: 1.65;
}

table.data thead th {
  background: #f6f2ed;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--muted);
  white-space: nowrap;
  border-bottom: 1px solid var(--line);
}

table.data tbody th {
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
  background: #fcfaf7;
}

table.data tbody tr:last-child th,
table.data tbody tr:last-child td {
  border-bottom: 0;
}

table.data td.is-good {
  color: var(--red);
  font-weight: 600;
}

.table-note {
  margin-top: 14px;
  font-size: 12px;
  color: var(--muted-2);
  line-height: 1.7;
}

/* ---------- 步骤 ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.step {
  padding: 28px 24px 30px 0;
  border-right: 1px solid var(--line);
}

.step:last-child {
  border-right: 0;
}

.step__num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--red);
  letter-spacing: 0.12em;
}

.step h3 {
  margin: 14px 0 10px;
  font-size: 19px;
}

.step p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
}

.step__out {
  margin-top: 16px;
  font-size: 12px;
  color: var(--ink);
  background: #f4efe9;
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
}

.section--ink .steps {
  border-top-color: var(--line-dark);
}

.section--ink .step {
  border-right-color: var(--line-dark);
}

.section--ink .step p {
  color: rgba(255, 255, 255, 0.6);
}

.section--ink .step__out {
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.82);
}

/* 循环图 */

.loop {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 28px;
}

.loop span {
  font-size: 13px;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
}

.loop i {
  color: var(--red);
  font-style: normal;
  font-size: 12px;
}

/* ---------- 指标 ---------- */

.metric {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1.1fr 1.4fr auto;
  gap: 20px;
  align-items: center;
}

.metric:first-child {
  border-top: 1px solid var(--line);
}

.metric__name {
  font-weight: 600;
  font-size: 16px;
}

.metric__def {
  font-size: 13.5px;
  color: var(--muted);
}

.metric__target {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--red);
  white-space: nowrap;
}

/* ---------- 案例 ---------- */

.case {
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: clamp(24px, 3vw, 36px);
  box-shadow: var(--shadow-sm);
}

.case__tag {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 11px;
  margin-bottom: 16px;
}

.case h3 {
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1.3;
}

.case__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 24px 0;
  padding: 20px 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.case__stats div b {
  display: block;
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 650;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.case__stats div span {
  font-size: 12px;
  color: var(--muted-2);
}

.case__list {
  margin: 0;
  padding-left: 0;
  list-style: none;
  display: grid;
  gap: 9px;
  font-size: 14px;
  color: var(--muted);
}

.case__list li {
  padding-left: 18px;
  position: relative;
}

.case__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--red);
}

.case__quote {
  margin-top: 22px;
  padding: 16px 18px;
  border-radius: 10px;
  background: #f7f3ee;
  font-size: 13px;
  line-height: 1.75;
  color: #4a433d;
}

.case__quote b {
  color: var(--ink);
}

/* before / after */

.ba {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 20px;
}

.ba__col {
  border-radius: 10px;
  padding: 16px;
  font-size: 12.5px;
  line-height: 1.7;
  border: 1px solid var(--line-soft);
  background: #faf8f5;
}

.ba__col--after {
  background: var(--red-soft);
  border-color: rgba(224, 48, 30, 0.2);
}

.ba__label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted-2);
  margin-bottom: 8px;
}

.ba__col--after .ba__label {
  color: var(--red);
}

/* ---------- 报价 ---------- */

.plans {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  align-items: stretch;
}

.plan {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.plan--featured {
  border: 1.5px solid var(--red);
  box-shadow: 0 20px 60px rgba(224, 48, 30, 0.12);
}

.plan__badge {
  position: absolute;
  top: -12px;
  left: 30px;
  background: var(--red);
  color: #fff;
  font-size: 11px;
  letter-spacing: 0.06em;
  padding: 4px 12px;
  border-radius: 999px;
}

.plan__name {
  font-size: 18px;
  font-weight: 650;
}

.plan__for {
  font-size: 12.5px;
  color: var(--muted-2);
  margin-top: 4px;
}

.plan__price {
  margin: 22px 0 4px;
  font-size: clamp(30px, 3.4vw, 38px);
  font-weight: 650;
  letter-spacing: -0.035em;
  line-height: 1;
}

.plan__price small {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--muted-2);
  margin-left: 6px;
}

.plan__period {
  font-size: 12.5px;
  color: var(--muted-2);
}

.plan ul {
  list-style: none;
  padding: 0;
  margin: 22px 0 26px;
  display: grid;
  gap: 10px;
  font-size: 14px;
  color: #3d3732;
  flex: 1;
}

.plan ul li {
  padding-left: 22px;
  position: relative;
  line-height: 1.6;
}

.plan ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 12px;
  height: 7px;
  border-left: 1.6px solid var(--red);
  border-bottom: 1.6px solid var(--red);
  transform: rotate(-45deg);
}

.plan .btn {
  width: 100%;
}

/* ---------- FAQ ---------- */

.faq {
  border-top: 1px solid var(--line);
}

.faq details {
  border-bottom: 1px solid var(--line);
}

.faq summary {
  list-style: none;
  cursor: pointer;
  padding: 24px 44px 24px 0;
  font-size: clamp(16px, 1.7vw, 18.5px);
  font-weight: 600;
  position: relative;
  letter-spacing: -0.01em;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "";
  position: absolute;
  right: 8px;
  top: 50%;
  width: 11px;
  height: 11px;
  border-right: 1.6px solid var(--muted);
  border-bottom: 1.6px solid var(--muted);
  transform: translateY(-70%) rotate(45deg);
  transition: transform 0.25s var(--ease);
}

.faq details[open] summary::after {
  transform: translateY(-30%) rotate(225deg);
}

.faq .faq__a {
  padding: 0 44px 26px 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 820px;
}

/* ---------- CTA ---------- */

.cta {
  background: var(--red);
  color: #fff;
  border-radius: 24px;
  padding: clamp(36px, 5vw, 64px);
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 36px;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.cta::after {
  content: "24";
  position: absolute;
  right: -20px;
  bottom: -70px;
  font-size: 260px;
  font-weight: 700;
  line-height: 1;
  color: rgba(255, 255, 255, 0.08);
  pointer-events: none;
}

.cta h2 {
  font-size: clamp(26px, 3.4vw, 42px);
  letter-spacing: -0.03em;
  line-height: 1.18;
}

.cta p {
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.82);
}

.cta__actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
  z-index: 1;
}

.cta__meta {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.7);
}

/* ---------- 页脚 ---------- */

.site-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.6);
  padding: 64px 0 32px;
  font-size: 14px;
}

.footer__top {
  display: grid;
  grid-template-columns: 1.5fr repeat(4, 1fr);
  gap: 32px;
  padding-bottom: 44px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__brand .brand__name {
  color: #fff;
}

.footer__brand p {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.8;
  max-width: 300px;
  color: rgba(255, 255, 255, 0.45);
}

.footer__col h4 {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.42);
  margin-bottom: 16px;
  font-weight: 500;
}

.footer__col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.footer__col a {
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.66);
  transition: color 0.2s;
}

.footer__col a:hover {
  color: #fff;
}

.footer__bottom {
  padding-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.34);
}

.footer__bottom a {
  color: rgba(255, 255, 255, 0.5);
}

/* ---------- 子页头 ---------- */

.page-head {
  background: var(--ink);
  color: #fff;
  padding: clamp(52px, 7vw, 96px) 0 clamp(48px, 6vw, 80px);
  position: relative;
  overflow: hidden;
}

.page-head::after {
  content: "";
  position: absolute;
  right: -10%;
  top: -40%;
  width: 60vw;
  height: 60vw;
  max-width: 720px;
  max-height: 720px;
  background: radial-gradient(circle, rgba(224, 48, 30, 0.3), transparent 68%);
  pointer-events: none;
}

.page-head__inner {
  position: relative;
  z-index: 1;
  max-width: 860px;
}

.page-head h1 {
  font-size: clamp(34px, 5vw, 60px);
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.page-head .lead {
  margin-top: 20px;
  max-width: 660px;
  color: rgba(255, 255, 255, 0.72);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.44);
  margin-bottom: 26px;
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.66);
}

.breadcrumb a:hover {
  color: #fff;
}

.breadcrumb span {
  opacity: 0.5;
}

/* ---------- 正文（文章） ---------- */

.prose {
  max-width: 760px;
  margin: 0 auto;
  font-size: 16.5px;
  line-height: 1.95;
  color: #2c2723;
}

.prose > * + * {
  margin-top: 22px;
}

.prose h2 {
  font-size: clamp(23px, 2.6vw, 30px);
  margin-top: 52px;
  letter-spacing: -0.025em;
}

.prose h3 {
  font-size: 19.5px;
  margin-top: 34px;
}

.prose p {
  color: #3a342f;
}

.prose ul,
.prose ol {
  padding-left: 1.3em;
  display: grid;
  gap: 8px;
}

.prose li {
  color: #3a342f;
}

.prose strong {
  color: var(--ink);
  background: linear-gradient(transparent 62%, rgba(224, 48, 30, 0.16) 62%);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin-top: 28px;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}

.prose th,
.prose td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--line-soft);
  text-align: left;
  line-height: 1.65;
}

.prose thead th {
  background: #f6f2ed;
  font-size: 12.5px;
  color: var(--muted);
}

.prose blockquote {
  border-left: 3px solid var(--red);
  padding: 6px 0 6px 22px;
  font-size: 18px;
  line-height: 1.8;
  color: var(--ink);
}

.prose .callout {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px 24px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.prose .callout strong {
  color: var(--ink);
  background: none;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  font-size: 12.5px;
  color: var(--muted-2);
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 38px;
}

/* 事实卡 */

.fact-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.fact-card__head {
  padding: 18px 24px;
  background: #f6f2ed;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 12px;
  color: var(--muted);
  font-family: var(--mono);
  letter-spacing: 0.06em;
}

.fact-card dl {
  margin: 0;
  padding: 8px 24px 20px;
}

.fact-card dt {
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--muted-2);
  margin-top: 16px;
}

.fact-card dd {
  margin: 4px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
}

/* 文章列表 */

.post-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.post-item {
  display: grid;
  grid-template-columns: 130px 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
  transition: padding-left 0.25s var(--ease);
}

.post-item:hover {
  padding-left: 8px;
}

.post-item__cat {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--red);
}

.post-item h3 {
  font-size: 19px;
  margin-bottom: 6px;
}

.post-item p {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.65;
}

.post-item__arrow {
  color: var(--muted-2);
}

/* 目录 */

.toc {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 24px;
  background: #fdfbf8;
  font-size: 13.5px;
}

@media (min-width: 1025px) {
  .toc {
    position: sticky;
    top: 100px;
  }
}

.toc h4 {
  font-size: 11px;
  font-family: var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-2);
  margin-bottom: 12px;
  font-weight: 500;
}

.toc ol {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 7px;
  color: var(--muted);
}

.toc a:hover {
  color: var(--red);
}

/* 联系区 */

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.contact-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 24px;
}

.contact-item h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

.contact-item p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
}

.contact-item a {
  color: var(--red);
  font-weight: 600;
  font-size: 15px;
}

/* 客户条 */

.client-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  align-items: center;
  font-size: 13px;
  color: var(--muted-2);
}

.client-strip b {
  color: var(--ink);
  font-weight: 550;
  font-size: 14px;
}

/* ---------- 动效 ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---------- 响应式 ---------- */

@media (max-width: 1024px) {
  .hero__inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .answer-card {
    max-width: 520px;
    transform: none;
  }
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer__top {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .footer__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 860px) {
  .nav,
  .header__cta {
    display: none;
  }
  .nav-toggle {
    display: inline-flex;
  }
  .site-header.is-open .nav {
    display: flex;
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 14px 20px 22px;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
  }
  .site-header.is-open .nav a {
    padding: 13px 12px;
    border-radius: 8px;
    font-size: 16px;
  }
  .statbar {
    grid-template-columns: repeat(2, 1fr);
    gap: 26px;
  }
  .split,
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }
  .steps {
    grid-template-columns: 1fr 1fr;
  }
  .step {
    padding-right: 24px;
    border-bottom: 1px solid var(--line);
  }
  .step:nth-child(2n) {
    border-right: 0;
  }
  .section--ink .step {
    border-bottom-color: var(--line-dark);
  }
  .plans {
    grid-template-columns: 1fr;
  }
  .cta {
    grid-template-columns: 1fr;
  }
  .metric {
    grid-template-columns: 1fr auto;
    gap: 6px 16px;
  }
  .metric__def {
    grid-column: 1 / -1;
    grid-row: 2;
  }
  .post-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .post-item__arrow {
    display: none;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .ba {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .container {
    padding: 0 20px;
  }
  .steps {
    grid-template-columns: 1fr;
  }
  .step {
    border-right: 0;
  }
  .case__stats {
    grid-template-columns: 1fr 1fr;
  }
  .footer__top {
    grid-template-columns: 1fr 1fr;
  }
  .hero__actions .btn {
    width: 100%;
  }
  .statbar {
    grid-template-columns: 1fr 1fr;
  }
  .answer-card {
    padding: 16px;
  }
}