/* ============================================================
   FitEats · 众康跃动 官网样式 v3
   视觉方向：浅色协调（demo 同款语言）—— 白/浅灰板块交替，
   单一蓝色强调，无深色大块、无多色渐变、无光晕噪点
   ============================================================ */

:root {
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --accent-soft: #eff6ff;
  --accent-softer: #f5f9ff;

  --ink: #0f172a;
  --muted: #475569;
  --soft: #64748b;
  --faint: #94a3b8;

  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --border: #e2e8f0;
  --border-soft: #edf1f7;

  --radius-lg: 20px;
  --radius-md: 14px;
  --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.04),
    0 14px 34px -22px rgba(15, 23, 42, 0.14);
  --shadow-hover: 0 4px 10px rgba(15, 23, 42, 0.05),
    0 26px 50px -26px rgba(15, 23, 42, 0.2);
  --font: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

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

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

section[id] {
  scroll-margin-top: 76px;
}

/* ---------- 图标 / 通用 ---------- */

.icon-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.icon {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex: none;
}

.skip-link {
  position: fixed;
  left: -9999px;
  top: 12px;
  z-index: 200;
  background: var(--accent);
  color: #fff;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 0.9rem;
}

.skip-link:focus {
  left: 12px;
}

:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.35);
  outline-offset: 3px;
  border-radius: 6px;
}

.container {
  width: min(1120px, 100% - 48px);
  margin: 0 auto;
}

.section {
  padding: 96px 0;
}

.section-head {
  max-width: 640px;
  margin: 0 auto 56px;
  text-align: center;
}

.section-head h2 {
  font-size: clamp(1.8rem, 3.4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 14px 0 12px;
}

.section-head .lead {
  color: var(--soft);
  font-size: 1.04rem;
}

.eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent);
}

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.card-hover {
  transition: transform 0.25s ease, box-shadow 0.25s ease,
    border-color 0.25s ease;
}

.card-hover:hover {
  transform: translateY(-4px);
  border-color: #c7d9f8;
  box-shadow: var(--shadow-hover);
}

.icon-tile {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  border-radius: 14px;
  color: var(--accent);
  background: var(--accent-soft);
}

.icon-tile .icon {
  width: 24px;
  height: 24px;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 24px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: inherit;
  font-size: 0.96rem;
  font-weight: 700;
  line-height: 1.2;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.2s ease, color 0.2s ease,
    border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

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

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 22px -12px rgba(37, 99, 235, 0.55);
}

.btn-primary:hover {
  background: var(--accent-dark);
  box-shadow: 0 14px 28px -12px rgba(37, 99, 235, 0.6);
}

.btn-ghost {
  background: #fff;
  color: var(--muted);
  border-color: var(--border);
}

.btn-ghost:hover {
  color: var(--accent);
  border-color: #b6cdf7;
}

.btn-lg {
  padding: 14px 30px;
  font-size: 1rem;
}

.btn-sm {
  padding: 9px 20px;
  font-size: 0.9rem;
}

.btn-block {
  width: 100%;
}

.btn-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transition: transform 0.25s ease;
}

.btn-arrow .icon {
  width: 14px;
  height: 14px;
}

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

/* ---------- 滚动显现 ---------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  transition-delay: var(--d, 0s);
}

[data-reveal].revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 头部导航 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.site-header.scrolled {
  border-bottom-color: var(--border);
  box-shadow: 0 8px 24px -20px rgba(15, 23, 42, 0.25);
}

.header-inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  flex: none;
  display: inline-flex;
  align-items: center;
  color: var(--ink);
}

.brand img {
  height: 36px;
  width: auto;
}

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

.site-nav a {
  padding: 8px 15px;
  border-radius: 999px;
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--muted);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.site-nav a:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

.site-nav a.active {
  color: var(--accent);
  background: var(--accent-soft);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 11px;
  border: 0;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  border-radius: 12px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 22px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 55;
  background: rgba(15, 23, 42, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s ease;
}

.nav-backdrop.show {
  opacity: 1;
  pointer-events: auto;
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: 80px 0 96px;
  background:
    radial-gradient(900px 480px at 88% -20%, rgba(37, 99, 235, 0.08), transparent 60%),
    linear-gradient(180deg, var(--accent-softer), #fff 58%);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 64px;
}

.hero-copy h1 {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--ink);
  margin: 18px 0 20px;
}

.hero-copy h1 .accent {
  color: var(--accent);
}

.hero-sub {
  font-size: 1.14rem;
  line-height: 1.75;
  color: var(--muted);
  max-width: 27em;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 34px 0 32px;
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.hero-points li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted);
}

.hero-points .icon {
  width: 16px;
  height: 16px;
  color: var(--accent);
}

.hero-shot {
  width: min(82%, 360px);
  margin: 0 auto;
  position: relative;
  text-align: center;
}

.hero-shot img {
  width: 100%;
  border-radius: 24px;
  border: 1px solid var(--border);
  box-shadow: 0 30px 60px -32px rgba(15, 23, 42, 0.35);
}

.shot-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--muted);
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
}

.shot-badge .icon {
  width: 15px;
  height: 15px;
  color: var(--accent);
}

/* ---------- 信任条 ---------- */

.trust-strip {
  border-top: 1px solid var(--border-soft);
  border-bottom: 1px solid var(--border-soft);
  background: #fff;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 30px 0;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 22px;
  border-left: 1px solid var(--border-soft);
}

.trust-item:first-child {
  border-left: 0;
  padding-left: 0;
}

.trust-item .icon-tile {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  flex: none;
}

.trust-item .icon-tile .icon {
  width: 21px;
  height: 21px;
}

.trust-item h3 {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--ink);
}

.trust-item p {
  font-size: 0.82rem;
  color: var(--soft);
}

/* ---------- 核心业务 ---------- */

.services {
  background: #fff;
}

.service-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  max-width: 900px;
  margin: 0 auto;
}

.service-card {
  padding: 40px;
}

.service-card h3 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--ink);
  margin: 20px 0 18px;
}

.check-list {
  display: grid;
  gap: 12px;
}

.check-list li {
  display: flex;
  align-items: center;
  gap: 11px;
  color: var(--muted);
  font-size: 0.98rem;
}

.check-list .icon {
  width: 18px;
  height: 18px;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 50%;
  padding: 3px;
}

.service-foot {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px dashed var(--border);
  font-size: 0.88rem;
  color: var(--soft);
}

/* ---------- 产品亮点 ---------- */

.highlight {
  background: var(--bg-soft);
}

.highlight-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 80px;
}

.highlight-copy h2 {
  font-size: clamp(1.8rem, 3.4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 16px 0 16px;
}

.highlight-copy > p {
  color: var(--muted);
  font-size: 1.04rem;
}

.highlight-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 28px 0 32px;
}

.highlight-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--muted);
}

.highlight-list .icon {
  width: 17px;
  height: 17px;
  color: var(--accent);
}

.highlight-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

.hl-frame {
  width: min(76%, 330px);
}

.hl-frame img {
  width: 100%;
  border-radius: 24px;
  border: 1px solid var(--border);
  box-shadow: 0 30px 60px -32px rgba(15, 23, 42, 0.3);
}

.hl-pills {
  display: flex;
  gap: 10px;
}

.hl-pills span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  background: #fff;
  border: 1px solid var(--border);
}

.hl-pills .icon {
  width: 14px;
  height: 14px;
  color: var(--accent);
}

/* ---------- 使用流程 ---------- */

.steps {
  background: #fff;
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.step-card {
  padding: 30px 26px;
}

.step-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 13px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 18px;
}

.step-card h3 {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.step-card p {
  color: var(--soft);
  font-size: 0.92rem;
}

/* ---------- 引流转化入口 ---------- */

.join {
  background: var(--bg-soft);
}

.join-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr 1fr;
  gap: 24px;
  align-items: stretch;
}

.join-card {
  padding: 32px;
  display: flex;
  flex-direction: column;
}

.join-card h3 {
  font-size: 1.18rem;
  font-weight: 800;
  color: var(--ink);
  margin: 18px 0 8px;
}

.card-sub {
  color: var(--soft);
  font-size: 0.93rem;
  margin-bottom: 22px;
}

.assess-form {
  display: grid;
  gap: 12px;
}

.assess-form label {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--muted);
}

.assess-form input,
.assess-form select,
.assess-form textarea {
  width: 100%;
  padding: 11px 13px;
  font-size: 0.94rem;
  font-family: inherit;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  resize: vertical;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.assess-form input::placeholder,
.assess-form textarea::placeholder {
  color: var(--faint);
}

.assess-form input:focus,
.assess-form select:focus,
.assess-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.assess-form input[aria-invalid="true"] {
  border-color: #e11d48;
  box-shadow: 0 0 0 4px rgba(225, 29, 72, 0.1);
}

.assess-form .btn {
  margin-top: 8px;
}

.form-note {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  font-size: 0.78rem;
  color: var(--soft);
}

.form-note .icon {
  width: 14px;
  height: 14px;
  color: var(--accent);
}

.form-success {
  text-align: center;
  padding: 30px 8px;
}

.success-ring {
  width: 60px;
  height: 60px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
}

.success-ring .icon {
  width: 28px;
  height: 28px;
}

.form-success h4 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.form-success p {
  color: var(--soft);
  font-size: 0.92rem;
  margin-bottom: 18px;
}

.qr-box {
  margin-top: auto;
  text-align: center;
}

.qr-frame {
  width: min(100%, 190px);
  margin: 0 auto 12px;
  padding: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 16px;
}

.qr-frame img {
  width: 100%;
  border-radius: 8px;
}

.qr-box p {
  font-size: 0.84rem;
  color: var(--soft);
}

/* ---------- 产品预览 ---------- */

.preview {
  background: #fff;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.preview-card {
  overflow: hidden;
}

.preview-media {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16 / 11;
  background: linear-gradient(180deg, var(--accent-softer), #fff);
  border-bottom: 1px solid var(--border-soft);
  overflow: hidden;
}

.preview-media img {
  width: 58%;
  border-radius: 18px;
  border: 1px solid var(--border);
  box-shadow: 0 18px 40px -24px rgba(15, 23, 42, 0.35);
  transition: transform 0.4s ease;
}

.preview-card:hover .preview-media img {
  transform: scale(1.04);
}

.preview-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--accent);
  background: #fff;
  border: 1px solid var(--border);
}

.preview-body {
  padding: 24px 26px 28px;
}

.preview-body h3 {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.preview-body p {
  color: var(--soft);
  font-size: 0.92rem;
}

/* ---------- 健康资讯 ---------- */

.blog {
  background: var(--bg-soft);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
  max-width: 960px;
  margin: 0 auto;
}

.blog-card {
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.blog-cover {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 20px 24px;
  height: 120px;
  background: var(--accent-soft);
  border-bottom: 1px solid var(--border-soft);
}

.blog-cover time {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 13px;
}

.cover-emoji {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  font-size: 1.6rem;
  border-radius: 15px;
  background: #fff;
  border: 1px solid var(--border);
}

.blog-body {
  padding: 24px 26px 26px;
  display: flex;
  flex-direction: column;
  gap: 9px;
  flex: 1;
}

.blog-meta {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--soft);
}

.blog-body h3 {
  font-size: 1.16rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.blog-body > p {
  color: var(--soft);
  font-size: 0.93rem;
}

.blog-cta {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: auto;
  padding-top: 12px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent);
  transition: gap 0.2s ease;
}

.blog-cta .icon {
  width: 15px;
  height: 15px;
}

.blog-cta:hover {
  gap: 11px;
}

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

.faq {
  background: #fff;
}

.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: grid;
  gap: 14px;
}

.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.faq-item[open] {
  border-color: #b6cdf7;
  box-shadow: var(--shadow-card);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 19px 22px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

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

.faq-icon {
  flex: none;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  transition: transform 0.3s ease, background-color 0.3s ease;
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
  background: var(--accent);
  color: #fff;
}

.faq-item .faq-icon .icon {
  width: 14px;
  height: 14px;
}

.faq-item > p {
  padding: 0 22px 20px;
  color: var(--muted);
  font-size: 0.94rem;
}

/* ---------- 关于我们 ---------- */

.about {
  background: var(--bg-soft);
}

.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 72px;
}

.about-copy h2 {
  font-size: clamp(1.8rem, 3.4vw, 2.5rem);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 16px 0 18px;
}

.about-copy > p {
  color: var(--muted);
  font-size: 1.02rem;
}

.about-note {
  display: inline-flex;
  align-items: center;
  margin-top: 18px;
  padding: 7px 15px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
}

.about-facts {
  padding: 12px 30px;
  margin: 0;
}

.about-facts div {
  display: grid;
  grid-template-columns: 104px 1fr;
  gap: 16px;
  padding: 15px 0;
  border-bottom: 1px solid var(--border-soft);
}

.about-facts div:last-child {
  border-bottom: 0;
}

.about-facts dt {
  font-weight: 700;
  color: var(--soft);
  font-size: 0.88rem;
}

.about-facts dd {
  margin: 0;
  font-weight: 700;
  color: var(--ink);
}

/* ---------- 联系我们 ---------- */

.contact {
  background: #fff;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
}

.contact-card {
  padding: 34px 28px;
  text-align: center;
}

.contact-card .icon-tile {
  margin: 0 auto 18px;
}

.contact-card h3 {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.contact-card p {
  color: var(--soft);
  font-size: 0.92rem;
}

.contact-hint {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--accent);
}

.contact-hint .icon {
  width: 14px;
  height: 14px;
}

/* ---------- 页脚 ---------- */

.site-footer {
  border-top: 1px solid var(--border-soft);
  background: #fff;
}

.footer-inner {
  padding-top: 56px;
  padding-bottom: 36px;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 48px;
}

.footer-brand img {
  height: 32px;
  width: auto;
  margin-bottom: 14px;
}

.footer-brand p {
  max-width: 30em;
  font-size: 0.9rem;
  color: var(--soft);
  line-height: 1.8;
}

.footer-col h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 14px;
}

.footer-col a {
  display: block;
  padding: 4px 0;
  font-size: 0.9rem;
  color: var(--muted);
  transition: color 0.2s ease;
}

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

.footer-bottom {
  border-top: 1px solid var(--border-soft);
  background: var(--bg-soft);
  padding: 18px 0;
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  font-size: 0.82rem;
  color: var(--soft);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-legal a:hover {
  color: var(--accent);
}

/* ---------- 回到顶部 ---------- */

.back-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 70;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 13px;
  color: var(--accent);
  background: #fff;
  box-shadow: var(--shadow-card);
  cursor: pointer;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.back-top.show {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.back-top:hover {
  color: #fff;
  background: var(--accent);
}

.back-top .icon {
  width: 18px;
  height: 18px;
}

/* ---------- 响应式 ---------- */

@media (max-width: 1024px) {
  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .trust-item:nth-child(3) {
    border-left: 0;
    padding-left: 0;
  }

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

}

@media (max-width: 900px) {
  .section {
    padding: 72px 0;
  }

  .hero {
    padding: 56px 0 72px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 44px;
    text-align: center;
  }

  .hero-sub {
    margin: 0 auto;
  }

  .hero-ctas,
  .hero-points {
    justify-content: center;
  }

  .service-grid,
  .preview-grid,
  .contact-grid,
  .about-inner,
  .highlight-inner {
    grid-template-columns: 1fr;
  }

  .highlight-visual {
    order: -1;
  }

  .about-copy {
    text-align: center;
  }

  .about-facts div {
    grid-template-columns: 1fr;
    gap: 2px;
    text-align: center;
  }

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

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: 72px;
    right: 0;
    bottom: 0;
    z-index: 58;
    width: min(80vw, 300px);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 4px;
    padding: 22px 14px;
    background: #fff;
    border-left: 1px solid var(--border);
    box-shadow: -24px 0 50px -30px rgba(15, 23, 42, 0.4);
    transform: translateX(102%);
    transition: transform 0.3s ease;
  }

  .site-nav.open {
    transform: translateX(0);
  }

  .site-nav a {
    padding: 13px 18px;
    font-size: 1rem;
  }

  .site-nav a:hover,
  .site-nav a.active {
    background: var(--accent-soft);
    color: var(--accent);
  }

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

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

  .highlight-list {
    grid-template-columns: 1fr;
  }

  .service-card {
    padding: 28px 24px;
  }

  .footer-bottom-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}