/* ==========================================================================
   北京燕智科技有限公司 官网
   黑金高端金融风 · Stripe-inspired 设计语言
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens (PRD §5.2)
   -------------------------------------------------------------------------- */
:root {
  /* 品牌金 */
  --gold: #C08A00;
  --gold-bright: #D9A300;
  --gold-deep: #9A6B00;
  /* 深 navy */
  --navy-900: #1c1e54;
  --navy-800: #23255f;
  /* 墨色文字 */
  --ink: #0d253d;
  --ink-secondary: #273951;
  --ink-mute: #64748d;
  /* 画布 */
  --canvas: #ffffff;
  --canvas-soft: #f6f9fc;
  --canvas-cream: #f5e9d4;
  /* 发丝线 */
  --hairline: #e3e8ee;

  /* 字体 */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  /* 间距 */
  --space-2: 2px;
  --space-4: 4px;
  --space-8: 8px;
  --space-12: 12px;
  --space-16: 16px;
  --space-24: 24px;
  --space-32: 32px;
  --space-64: 64px;
  --space-96: 96px;

  /* 圆角 */
  --radius-pill: 9999px;
  --radius-card: 12px;
  --radius-input: 6px;

  --container: 1200px;
}

/* --------------------------------------------------------------------------
   2. Reset / Base
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--canvas);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01" on, "tnum" on;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.18s ease;
}

ul,
ol {
  list-style: none;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* --------------------------------------------------------------------------
   3. Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 300;
  line-height: 1.15;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.display-xl {
  font-size: 56px;
  letter-spacing: -1.4px;
  line-height: 1.08;
  font-weight: 300;
}

.display-lg {
  font-size: 48px;
  letter-spacing: -1px;
  line-height: 1.12;
  font-weight: 300;
}

.display-md {
  font-size: 32px;
  letter-spacing: -0.6px;
  line-height: 1.2;
  font-weight: 300;
}

.h2 {
  font-size: 26px;
  letter-spacing: -0.4px;
  line-height: 1.25;
  font-weight: 300;
}

.h3 {
  font-size: 20px;
  letter-spacing: -0.2px;
  line-height: 1.3;
  font-weight: 300;
}

.lead {
  font-size: 20px;
  color: var(--ink-secondary);
  line-height: 1.6;
}

.body-lg {
  font-size: 18px;
  color: var(--ink-secondary);
}

.text-secondary {
  color: var(--ink-secondary);
}

.text-mute {
  color: var(--ink-mute);
}

.caption {
  font-size: 13px;
  color: var(--ink-mute);
}

.num {
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* --------------------------------------------------------------------------
   4. Layout
   -------------------------------------------------------------------------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--space-96) 0;
}

.section-soft {
  background: var(--canvas-soft);
}

.section-tight {
  padding: var(--space-64) 0;
}

.section-head {
  max-width: 680px;
  margin-bottom: var(--space-64);
}

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

.section-head .eyebrow {
  display: inline-block;
  margin-bottom: var(--space-16);
}

.section-head h2 {
  margin-bottom: var(--space-16);
}

.section-head .sub {
  font-size: 18px;
  color: var(--ink-mute);
  line-height: 1.6;
}

/* Eyebrow / label pill */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--gold-deep);
  background: var(--canvas-cream);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
}

.eyebrow .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold);
}

/* --------------------------------------------------------------------------
   5. Buttons (PRD §5.6)
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.5;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.18s ease, color 0.18s ease,
    border-color 0.18s ease, transform 0.12s ease, box-shadow 0.18s ease;
  white-space: nowrap;
}

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

.btn-primary {
  background: var(--navy-900);
  color: #fff;
}

.btn-primary:hover {
  background: var(--navy-800);
  color: #fff;
}

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

.btn-gold:hover {
  background: var(--gold-bright);
  color: #fff;
}

.btn-gold:active {
  background: var(--gold-deep);
}

.btn-outline {
  background: transparent;
  color: var(--gold);
  border-color: var(--gold);
}

.btn-outline:hover {
  background: var(--gold);
  color: #fff;
}

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

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

.btn-lg {
  padding: 12px 24px;
  font-size: 16px;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 14px;
}

/* --------------------------------------------------------------------------
   6. Header / Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--hairline);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.nav-brand img {
  height: 46px;
  width: auto;
  border-radius: 8px;
}

.nav-brand .brand-name {
  line-height: 1.2;
}

.nav-brand .brand-sub {
  display: block;
  font-size: 11px;
  font-weight: 400;
  color: var(--ink-mute);
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  padding: 8px 14px;
  font-size: 15px;
  color: var(--ink-secondary);
  border-radius: var(--radius-pill);
}

.nav-links a:hover {
  color: var(--ink);
  background: var(--canvas-soft);
}

.nav-links a.active {
  color: var(--gold-deep);
  font-weight: 500;
}

.nav-cta {
  margin-left: var(--space-12);
}

/* 桌面端隐藏「仅移动端显示」的导航 CTA；移动端汉堡菜单内显示 */
.mobile-show {
  display: none;
}

/* 导航内的按钮始终白字，避免被 .nav-links a 的墨色覆盖 */
.nav-links a.nav-cta {
  color: #fff;
}

/* 产品中心下拉 */
.nav-dropdown {
  position: relative;
}

.nav-dropdown .drop-trigger {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.nav-dropdown .drop-trigger .caret {
  width: 10px;
  height: 10px;
  transition: transform 0.18s ease;
}

.nav-dropdown:hover .drop-trigger .caret {
  transform: rotate(180deg);
}

.drop-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  box-shadow: 0 16px 40px rgba(13, 37, 61, 0.12);
  padding: var(--space-8);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
  z-index: 200;
}

.nav-dropdown:hover .drop-menu,
.nav-dropdown.open .drop-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.drop-menu a {
  display: block;
  padding: 10px 12px;
  font-size: 14px;
  border-radius: 8px;
}

.drop-menu a:hover {
  background: var(--canvas-soft);
  color: var(--gold-deep);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: 8px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   7. Hero (渐变 Mesh 背景)
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 120px 0 96px;
  background: var(--navy-900);
  color: #fff;
}

.hero .hero-mesh {
  position: absolute;
  inset: 0 0 auto 0;
  height: 55%;
  pointer-events: none;
  background:
    radial-gradient(55% 70% at 12% 6%, rgba(217, 163, 0, 0.38) 0%, rgba(217, 163, 0, 0) 62%),
    radial-gradient(45% 60% at 88% 0%, rgba(192, 138, 0, 0.32) 0%, rgba(192, 138, 0, 0) 58%),
    radial-gradient(70% 90% at 50% 120%, rgba(0, 0, 0, 0.35) 0%, rgba(0, 0, 0, 0) 70%);
}

.hero .hero-mesh::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(28, 30, 84, 0) 0%, var(--navy-900) 100%);
}

/* 动态粒子背景层（金色科技感，鼠标交互） */
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-inner {
  max-width: 760px;
}

.hero .eyebrow {
  margin-bottom: var(--space-24);
  color: var(--gold-bright);
  background: rgba(217, 163, 0, 0.14);
  border: 1px solid rgba(217, 163, 0, 0.28);
}

.hero h1 {
  margin-bottom: var(--space-24);
  color: #fff;
}

.hero .lead {
  margin-bottom: var(--space-32);
  color: #c6c9e4;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  flex-wrap: wrap;
}

.hero-actions .hero-phone {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #c6c9e4;
  font-size: 15px;
}

.hero-actions .hero-phone strong {
  color: #fff;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

/* Hero 深色底上的 ghost 按钮改为浅色（避免深色字在深底上看不见） */
.hero .btn-ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.45);
}

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

/* 首页 hero 居中变体 */
.hero.hero-center .hero-inner {
  margin: 0 auto;
  text-align: center;
}

.hero.hero-center .hero-actions {
  justify-content: center;
}

.hero.hero-center .eyebrow {
  justify-content: center;
}

/* 产品页 hero 稍矮 */
.hero.hero-compact {
  padding: 80px 0 64px;
}

/* --------------------------------------------------------------------------
   8. 客户背书条
   -------------------------------------------------------------------------- */
.trustbar {
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  background: var(--canvas);
  padding: var(--space-24) 0;
}

.trustbar .container {
  display: flex;
  align-items: center;
  gap: var(--space-32);
  flex-wrap: wrap;
  justify-content: center;
}

.trustbar .trust-label {
  font-size: 13px;
  color: var(--ink-mute);
  letter-spacing: 0.02em;
}

.trustbar .trust-list {
  display: flex;
  align-items: center;
  gap: var(--space-32);
  flex-wrap: wrap;
}

.trustbar .trust-item {
  font-size: 16px;
  font-weight: 500;
  color: var(--ink-secondary);
  letter-spacing: 0.01em;
}

.trustbar .trust-item .sep {
  color: var(--gold);
  margin-right: 8px;
  font-weight: 400;
}

/* --------------------------------------------------------------------------
   9. Cards
   -------------------------------------------------------------------------- */
.card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  padding: var(--space-32);
  transition: box-shadow 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.card:hover {
  border-color: #d5dbe2;
  box-shadow: 0 10px 30px rgba(13, 37, 61, 0.06);
  transform: translateY(-2px);
}

.grid {
  display: grid;
  gap: var(--space-24);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* 产品/特性卡片 */
.card .card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--canvas-soft);
  color: var(--gold);
  margin-bottom: var(--space-16);
}

.card .card-icon svg {
  width: 22px;
  height: 22px;
}

.card h3 {
  margin-bottom: var(--space-8);
}

.card p {
  color: var(--ink-mute);
  font-size: 15px;
  line-height: 1.6;
}

.card .card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--space-16);
  font-size: 14px;
  font-weight: 500;
  color: var(--gold);
}

.card .card-link:hover {
  color: var(--gold-deep);
}

/* 奶油插曲卡片 */
.card-cream {
  background: var(--canvas-cream);
  border-color: transparent;
}

.card-navy {
  background: var(--navy-900);
  border-color: transparent;
}

.card-navy h3,
.card-navy p {
  color: #e6e8f5;
}

.card-navy .card-icon {
  background: rgba(255, 255, 255, 0.08);
  color: var(--gold-bright);
}

/* --------------------------------------------------------------------------
   10. 业务闭环图
   -------------------------------------------------------------------------- */
.flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-16);
  align-items: stretch;
}

.flow-step {
  position: relative;
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  padding: var(--space-24);
  text-align: center;
}

.flow-step .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--canvas-cream);
  color: var(--gold-deep);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: var(--space-12);
}

.flow-step .step-icon {
  color: var(--gold);
  margin: 0 auto var(--space-12);
  width: 36px;
  height: 36px;
}

.flow-step h4 {
  font-size: 17px;
  font-weight: 500;
  margin-bottom: var(--space-4);
}

.flow-step p {
  font-size: 13px;
  color: var(--ink-mute);
}

.flow-arrow {
  position: absolute;
  top: 50%;
  right: -19px;
  transform: translateY(-50%);
  z-index: 2;
  width: 22px;
  height: 22px;
  color: var(--gold);
}

/* --------------------------------------------------------------------------
   11. 痛点共鸣区
   -------------------------------------------------------------------------- */
.pain-list {
  display: grid;
  gap: var(--space-16);
}

.pain-row {
  display: grid;
  grid-template-columns: 1fr 40px 1fr;
  gap: var(--space-16);
  align-items: center;
  padding: var(--space-24);
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
}

.pain-row .pain {
  font-size: 18px;
  font-weight: 500;
  color: var(--ink);
}

.pain-row .pain .tag {
  display: inline-block;
  margin-left: 8px;
  font-size: 13px;
  font-weight: 400;
  color: var(--gold-deep);
  background: var(--canvas-cream);
  border-radius: var(--radius-pill);
  padding: 2px 10px;
}

.pain-row .arrow {
  text-align: center;
  color: var(--gold);
  font-size: 18px;
}

.pain-row .solution {
  color: var(--ink-secondary);
  font-size: 15px;
}

/* --------------------------------------------------------------------------
   12. 为什么选我们
   -------------------------------------------------------------------------- */
.why-item {
  display: flex;
  gap: var(--space-16);
}

.why-item .why-icon {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--canvas-cream);
  color: var(--gold-deep);
}

.why-item .why-icon svg {
  width: 20px;
  height: 20px;
}

.why-item h3 {
  font-size: 18px;
  margin-bottom: var(--space-8);
}

.why-item p {
  font-size: 15px;
  color: var(--ink-mute);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   13. 案例卡片
   -------------------------------------------------------------------------- */
.case-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
}

.case-card .case-tag {
  align-self: flex-start;
  font-size: 12px;
  font-weight: 500;
  color: var(--gold-deep);
  background: var(--canvas-cream);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
}

.case-card h3 {
  font-size: 20px;
}

.case-card .case-meta {
  display: flex;
  gap: var(--space-16);
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--ink-mute);
}

.case-card .case-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.case-card .case-result {
  margin-top: auto;
  padding: var(--space-16);
  background: var(--canvas-soft);
  border-radius: 8px;
  font-size: 14px;
  color: var(--ink-secondary);
}

.case-card .case-result strong {
  color: var(--gold-deep);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   14. 底部 CTA
   -------------------------------------------------------------------------- */
.cta-band {
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  padding: var(--space-64);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(50% 70% at 20% 0%, rgba(217, 163, 0, 0.14) 0%, transparent 70%),
    radial-gradient(50% 70% at 85% 0%, rgba(192, 138, 0, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.cta-band h2 {
  color: var(--ink);
  margin-bottom: var(--space-16);
  position: relative;
}

.cta-band p {
  color: var(--ink-secondary);
  margin-bottom: var(--space-32);
  position: relative;
}

.cta-band .cta-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-16);
  flex-wrap: wrap;
  position: relative;
}

.cta-band .cta-phone {
  color: var(--ink);
  font-size: 18px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

/* --------------------------------------------------------------------------
   15. 页脚
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--navy-900);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: var(--space-64) 0 var(--space-32);
}

.site-footer .nav-brand {
  color: #fff;
}

.site-footer .brand-sub {
  color: #a6abd4;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: var(--space-32);
  margin-bottom: var(--space-64);
}

.footer-brand p {
  margin-top: var(--space-16);
  font-size: 14px;
  color: #c6c9e4;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 500;
  color: #fff;
  margin-bottom: var(--space-16);
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: #a6abd4;
  padding: 4px 0;
}

.footer-col a:hover {
  color: var(--gold-bright);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: var(--space-24);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-16);
  flex-wrap: wrap;
  font-size: 13px;
  color: #a6abd4;
}

.footer-bottom .icp {
  letter-spacing: 0.02em;
}

/* --------------------------------------------------------------------------
   16. 表单
   -------------------------------------------------------------------------- */
.form {
  display: grid;
  gap: var(--space-24);
}

.form-field {
  display: grid;
  gap: var(--space-8);
}

.form-field label {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-secondary);
}

.form-field label .req {
  color: var(--gold);
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-input);
  background: var(--canvas);
  font-size: 15px;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(192, 138, 0, 0.12);
}

.form-field textarea {
  resize: vertical;
  min-height: 120px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
}

.form-message {
  display: none;
  padding: var(--space-16);
  border-radius: 8px;
  font-size: 14px;
}

.form-message.success {
  display: block;
  background: #eaf6ef;
  color: #1a7a46;
  border: 1px solid #bfe5cd;
}

.form-message.error {
  display: block;
  background: #fdecea;
  color: #b3261e;
  border: 1px solid #f5c6c0;
}

/* --------------------------------------------------------------------------
   17. 产品页通用
   -------------------------------------------------------------------------- */
.feature-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-16);
}

.feature-item {
  display: flex;
  gap: var(--space-16);
  padding: var(--space-24);
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
}

.feature-item .feat-icon {
  flex: 0 0 auto;
  color: var(--gold);
}

.feature-item .feat-icon svg {
  width: 22px;
  height: 22px;
}

.feature-item h4 {
  font-size: 16px;
  font-weight: 500;
  margin-bottom: var(--space-4);
}

.feature-item p {
  font-size: 14px;
  color: var(--ink-mute);
  line-height: 1.6;
}

.benefit-list {
  display: grid;
  gap: var(--space-16);
}

.benefit-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-12);
  padding: var(--space-16) var(--space-24);
  background: var(--canvas-soft);
  border-radius: var(--radius-card);
  border: 1px solid var(--hairline);
}

.benefit-item .check {
  flex: 0 0 auto;
  color: var(--gold);
  font-weight: 600;
}

.benefit-item p {
  font-size: 15px;
  color: var(--ink-secondary);
}

/* 仪表盘 mockup */
.mockup {
  background: var(--navy-900);
  border-radius: var(--radius-card);
  padding: var(--space-32);
  color: #e6e8f5;
  overflow: hidden;
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
}

.mockup .mock-top {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: var(--space-24);
}

.mockup .mock-top .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.mockup .mock-top .dot.r { background: #ff5f57; }
.mockup .mock-top .dot.y { background: #febc2e; }
.mockup .mock-top .dot.g { background: #28c840; }

.mockup .mock-title {
  font-size: 13px;
  color: #a8acd0;
  margin-bottom: var(--space-16);
}

.mockup .mock-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.mockup .mock-table th {
  text-align: left;
  color: #a8acd0;
  font-weight: 400;
  padding: 8px 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.mockup .mock-table td {
  padding: 10px 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  color: #e6e8f5;
}

.mockup .mock-table td.num {
  color: var(--gold-bright);
  font-variant-numeric: tabular-nums;
}

.mockup .mock-code {
  font-size: 12px;
  line-height: 1.8;
  color: #a8acd0;
}

.mockup .mock-code .k { color: #7ee0a3; }
.mockup .mock-code .s { color: #f2c96d; }
.mockup .mock-code .c { color: #6b7094; }

/* 分栏 */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-64);
  align-items: center;
}

/* 面包屑 */
.breadcrumb {
  font-size: 13px;
  color: var(--ink-mute);
  margin-bottom: var(--space-24);
}

.breadcrumb a:hover {
  color: var(--gold);
}

.breadcrumb .sep {
  margin: 0 8px;
  color: var(--hairline);
}

/* 关于我们 */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-24);
}

.stat {
  text-align: center;
  padding: var(--space-32);
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
}

.stat .stat-num {
  font-size: 40px;
  font-weight: 300;
  letter-spacing: -0.6px;
  color: var(--gold-deep);
  font-variant-numeric: tabular-nums;
}

.stat .stat-label {
  margin-top: var(--space-8);
  font-size: 14px;
  color: var(--ink-mute);
}

/* --------------------------------------------------------------------------
   18. 响应式
   -------------------------------------------------------------------------- */
@media (max-width: 1439px) {
  .container {
    padding: 0 32px;
  }
}

@media (max-width: 1023px) {
  .display-xl { font-size: 48px; letter-spacing: -1px; }
  .display-lg { font-size: 40px; letter-spacing: -0.8px; }
  .section { padding: var(--space-64) 0; }

  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }

  .flow { grid-template-columns: repeat(2, 1fr); }
  .flow-arrow { display: none; }

  .split { grid-template-columns: 1fr; gap: var(--space-32); }
  .feature-list { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: 1fr 1fr; }

  .pain-row { grid-template-columns: 1fr; gap: var(--space-8); }
  .pain-row .arrow { display: none; }

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

@media (max-width: 767px) {
  .display-xl { font-size: 36px; letter-spacing: -0.6px; }
  .display-lg { font-size: 32px; letter-spacing: -0.5px; }
  .display-md { font-size: 28px; letter-spacing: -0.4px; }
  .h2 { font-size: 24px; }
  .lead { font-size: 18px; }

  .container { padding: 0 20px; }

  .nav-toggle { display: flex; }

  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    padding: var(--space-8) var(--space-16) var(--space-16);
    display: none;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 12px 8px;
    border-radius: 8px;
  }

  .nav-cta {
    margin-left: 0;
    display: none;
  }

  .nav-dropdown .drop-menu {
    position: static;
    min-width: 0;
    border: none;
    box-shadow: none;
    padding: 0 0 0 var(--space-12);
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
  }

  .nav-dropdown.open .drop-menu {
    display: block;
  }

  .nav-dropdown .drop-trigger .caret {
    display: none;
  }

  .nav-cta.mobile-show {
    display: inline-flex;
    margin-top: var(--space-8);
  }

  .hero { padding: 80px 0 64px; }
  .hero .hero-mesh { height: 30%; }

  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }

  .flow { grid-template-columns: 1fr; }

  .form-row { grid-template-columns: 1fr; }

  .cta-band { padding: var(--space-32) var(--space-24); }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }

  .stat-grid { grid-template-columns: 1fr; }

  .trustbar .container { gap: var(--space-12); justify-content: flex-start; }
}

/* 打印友好 */
@media print {
  .site-header,
  .cta-band,
  .site-footer {
    display: none;
  }
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}