/* ===== 基础变量 ===== */
:root {
  --c-primary: #2563eb;
  --c-primary-dark: #1d4ed8;
  --c-primary-light: #dbeafe;
  --c-bg: #eef7ff;
  --c-bg-alt: #f8fbff;
  --c-text: #1f2937;
  --c-text-muted: #6b7280;
  --c-border: #e5e7eb;
  --c-white: #ffffff;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 8px rgba(37, 99, 235, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 20px 40px rgba(37, 99, 235, 0.12), 0 8px 16px rgba(0, 0, 0, 0.06);
  --container: 1200px;
}

/* ===== Reset ===== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--c-text);
  background: var(--c-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

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

/* ===== 顶部导航 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--c-border);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.35;
}

.brand-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-text);
  letter-spacing: 0.3px;
  white-space: nowrap;
}

.brand-sub {
  font-size: 11px;
  color: var(--c-text-muted);
  white-space: nowrap;
}

.nav-links {
  display: flex;
  gap: 22px;
  align-items: center;
}

.nav-links a {
  font-size: 14px;
  color: var(--c-text-muted);
  font-weight: 500;
  transition: color 0.2s;
  white-space: nowrap;
}

.nav-links a:hover {
  color: var(--c-primary);
}

.nav-cta {
  background: var(--c-primary);
  color: var(--c-white) !important;
  padding: 8px 20px;
  border-radius: 999px;
  transition: background 0.2s, transform 0.2s;
}

.nav-cta:hover {
  background: var(--c-primary-dark);
  transform: translateY(-1px);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  background: linear-gradient(180deg, var(--c-bg) 0%, #ffffff 100%);
  padding: 80px 0 120px;
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 60px;
  align-items: center;
}

.badge {
  display: inline-block;
  background: var(--c-primary-light);
  color: var(--c-primary-dark);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
}

.hero-text h1 {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.15;
  color: var(--c-text);
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 60%, #3b82f6 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: 20px;
  font-weight: 600;
  color: var(--c-primary-dark);
  margin-top: 14px;
}

.subtitle {
  font-size: 16px;
  color: var(--c-text-muted);
  margin: 18px 0 32px;
  max-width: 560px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--c-primary);
  color: var(--c-white);
}

.btn-primary:hover {
  background: var(--c-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--c-primary);
  border-color: var(--c-primary-light);
}

.btn-ghost:hover {
  background: var(--c-primary-light);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  gap: 36px;
}

.hero-stats li {
  display: flex;
  flex-direction: column;
}

.hero-stats strong {
  font-size: 28px;
  color: var(--c-primary);
  font-weight: 800;
}

.hero-stats span {
  font-size: 13px;
  color: var(--c-text-muted);
}

.hero-shot {
  position: relative;
}

.hero-shot::before {
  content: '';
  position: absolute;
  inset: -20px;
  background: radial-gradient(circle at center, rgba(37, 99, 235, 0.18), transparent 70%);
  border-radius: 32px;
  z-index: -1;
}

.hero-shot img {
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--c-border);
}

.hero-shot-frame {
  position: relative;
}

.hero-float {
  position: absolute;
  right: -12px;
  bottom: -34px;
  width: 280px;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
  padding: 18px 20px;
  z-index: 2;
}

.hero-float-tag {
  display: inline-block;
  background: var(--c-primary-light);
  color: var(--c-primary-dark);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 8px;
}

.hero-float strong {
  display: block;
  font-size: 16px;
  color: var(--c-text);
  margin-bottom: 4px;
}

.hero-float p {
  font-size: 12px;
  color: var(--c-text-muted);
  line-height: 1.6;
  margin-bottom: 8px;
}

.hero-float a {
  font-size: 13px;
  font-weight: 600;
  color: var(--c-primary);
}

.hero-domain {
  position: absolute;
  top: 18px;
  left: 18px;
  background: rgba(15, 23, 42, 0.78);
  color: var(--c-white);
  font-size: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  z-index: 2;
}

.hero-wave {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--c-white);
  clip-path: polygon(0 100%, 100% 100%, 100% 0, 50% 50%, 0 0);
}

/* ===== 官方入口 ===== */
.portal {
  position: relative;
  z-index: 2;
  margin-top: -64px;
  padding-bottom: 16px;
}

.portal-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.portal-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow-md);
  transition: all 0.25s ease;
}

.portal-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--c-primary-light);
}

.portal-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: 12px;
  background: var(--c-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.portal-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.portal-info strong {
  font-size: 15px;
  color: var(--c-text);
}

.portal-info small {
  font-size: 11px;
  color: var(--c-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.portal-arrow {
  margin-left: auto;
  flex-shrink: 0;
  font-size: 12px;
  font-weight: 600;
  color: var(--c-primary);
}

/* ===== Section 通用 ===== */
.section {
  padding: 96px 0;
}

.section-alt {
  background: var(--c-bg-alt);
}

.section-head {
  text-align: center;
  margin-bottom: 56px;
}

.section-head h2 {
  font-size: 36px;
  font-weight: 800;
  color: var(--c-text);
  letter-spacing: -0.3px;
  margin-bottom: 12px;
}

.section-head p {
  font-size: 16px;
  color: var(--c-text-muted);
}

/* ===== 关于我们 ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  font-size: 15px;
  color: var(--c-text-muted);
  line-height: 1.9;
  margin-bottom: 14px;
}

.about-text .about-lead {
  font-size: 17px;
  color: var(--c-text);
  font-weight: 500;
  line-height: 1.8;
}

.about-list {
  margin-top: 22px;
  display: grid;
  gap: 10px;
}

.about-list li {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  color: var(--c-text-muted);
  line-height: 1.7;
}

.about-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 2px;
  color: var(--c-primary);
  font-weight: 700;
}

.about-list strong {
  color: var(--c-text);
}

.company-card {
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 30px 26px;
  box-shadow: var(--shadow-sm);
}

.company-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 18px;
}

.company-dl > div {
  display: grid;
  grid-template-columns: 78px 1fr;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--c-border);
}

.company-dl > div:last-child {
  border-bottom: none;
}

.company-dl dt {
  font-size: 13px;
  color: var(--c-text-muted);
}

.company-dl dd {
  font-size: 13px;
  color: var(--c-text);
  line-height: 1.7;
  word-break: break-all;
}

.company-dl a {
  color: var(--c-primary);
}

.btn-block {
  width: 100%;
  margin-top: 20px;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 52px;
  padding: 28px;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
}

.about-stats li {
  text-align: center;
}

.about-stats strong {
  display: block;
  font-size: 30px;
  font-weight: 800;
  color: var(--c-primary);
}

.about-stats span {
  font-size: 13px;
  color: var(--c-text-muted);
}

/* ===== 旗下产品 ===== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.product-card {
  display: flex;
  flex-direction: column;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.25s ease;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--c-primary-light);
}

.product-media {
  position: relative;
  height: 380px;
  overflow: hidden;
  background: linear-gradient(160deg, #dbeafe 0%, #eff6ff 60%, #ffffff 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.product-media-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 12px;
}

.product-media-learn {
  background: linear-gradient(160deg, #e0f2fe 0%, #f0f9ff 55%, #ffffff 100%);
}

.product-domain {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(15, 23, 42, 0.78);
  color: var(--c-white);
  font-size: 12px;
  padding: 5px 12px;
  border-radius: 999px;
  z-index: 2;
}

.learn-window {
  width: 100%;
  max-width: 420px;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.learn-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px;
  background: #eef2f7;
  border-bottom: 1px solid var(--c-border);
}

.learn-bar span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #cbd5e1;
}

.learn-bar span:first-child {
  background: #fca5a5;
}

.learn-bar span:nth-child(2) {
  background: #fcd34d;
}

.learn-bar span:nth-child(3) {
  background: #86efac;
}

.learn-bar em {
  margin-left: 6px;
  font-style: normal;
  font-size: 11px;
  color: var(--c-text-muted);
}

.learn-body {
  padding: 18px 20px 20px;
}

.learn-kicker {
  font-size: 11px;
  color: var(--c-primary);
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.learn-body h4 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
}

.learn-rows li {
  font-size: 12px;
  color: var(--c-text-muted);
  padding: 6px 0;
  border-bottom: 1px dashed var(--c-border);
}

.learn-rows li:last-child {
  border-bottom: none;
}

.learn-rows span {
  display: inline-block;
  min-width: 96px;
  color: var(--c-text);
  font-weight: 600;
}

.learn-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.learn-actions span {
  font-size: 11px;
  color: var(--c-primary-dark);
  background: var(--c-primary-light);
  padding: 5px 10px;
  border-radius: 999px;
}

.product-body {
  padding: 28px;
}

.product-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  color: var(--c-primary-dark);
  background: var(--c-primary-light);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.product-body h3 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 10px;
}

.product-body > p {
  font-size: 14px;
  color: var(--c-text-muted);
  line-height: 1.8;
}

.product-feature-list {
  display: grid;
  gap: 6px;
  margin-top: 16px;
}

.product-feature-list li {
  position: relative;
  padding-left: 22px;
  font-size: 13px;
  color: var(--c-text-muted);
  line-height: 1.6;
}

.product-feature-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--c-primary);
  font-weight: 700;
}

.product-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.product-links .btn {
  padding: 10px 22px;
  font-size: 14px;
}

.product-note {
  font-size: 12px !important;
  color: #94a3b8 !important;
  border-top: 1px solid var(--c-border);
  padding-top: 12px;
  margin-top: 18px;
}

/* ===== 核心功能 ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: all 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--c-primary-light);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 18px;
}

.icon-blue {
  background: #dbeafe;
}

.icon-green {
  background: #d1fae5;
}

.icon-purple {
  background: #ede9fe;
}

.icon-amber {
  background: #fef3c7;
}

.feature-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  color: var(--c-text-muted);
  line-height: 1.6;
}

.section-foot {
  text-align: center;
  margin-top: 32px;
}

.section-foot a {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-primary);
}

.section-foot a:hover {
  color: var(--c-primary-dark);
  text-decoration: underline;
}

/* ===== 智享学习平台能力 ===== */
.learn-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.learn-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: all 0.25s ease;
}

.learn-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--c-primary-light);
}

.learn-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--c-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 14px;
}

.learn-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.learn-card p {
  font-size: 14px;
  color: var(--c-text-muted);
  line-height: 1.7;
}

/* ===== 多端支持 ===== */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.platform-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 32px 16px;
  text-align: center;
  transition: all 0.25s ease;
}

.platform-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--c-primary-light);
}

.platform-emoji {
  font-size: 40px;
  margin-bottom: 12px;
}

.platform-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.platform-card p {
  font-size: 13px;
  color: var(--c-text-muted);
}

.platform-note {
  text-align: center;
  font-size: 13px;
  color: var(--c-text-muted);
  margin-top: 24px;
}

/* ===== 产品截图 ===== */
.shot-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.shot-item {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.shot-item:hover {
  transform: translateY(-6px) scale(1.01);
  box-shadow: var(--shadow-lg);
}

.shot-item img {
  width: 100%;
  height: 420px;
  object-fit: contain;
  background: var(--c-bg);
  padding: 12px;
}

.shot-item figcaption {
  padding: 14px 18px;
  font-size: 14px;
  color: var(--c-text);
  font-weight: 600;
  border-top: 1px solid var(--c-border);
}

/* ===== 业务范围 ===== */
.scope-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.scope-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: all 0.25s ease;
}

.scope-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--c-primary-light);
}

.scope-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--c-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 16px;
}

.scope-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.scope-card p {
  font-size: 14px;
  color: var(--c-text-muted);
}

/* ===== 技术架构 ===== */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.tech-item {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: all 0.25s ease;
}

.tech-item:hover {
  border-color: var(--c-primary-light);
  box-shadow: var(--shadow-md);
}

.tech-item h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.tech-item p {
  font-size: 14px;
  color: var(--c-text-muted);
}

/* ===== 服务保障 ===== */
.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 26px 24px;
}

.service-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.service-card p {
  font-size: 14px;
  color: var(--c-text-muted);
  line-height: 1.7;
}

.process {
  margin-top: 48px;
  padding: 32px;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
}

.process h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 22px;
  text-align: center;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  list-style: none;
}

.process-steps li {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 18px 18px 16px;
}

.process-steps span {
  display: block;
  font-size: 12px;
  font-weight: 700;
  color: var(--c-primary);
  margin-bottom: 6px;
}

.process-steps strong {
  display: block;
  font-size: 15px;
  margin-bottom: 6px;
}

.process-steps p {
  font-size: 13px;
  color: var(--c-text-muted);
  line-height: 1.6;
}

/* ===== 常见问题 ===== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 18px 52px 18px 22px;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-text);
}

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

.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 600;
  color: var(--c-primary);
}

.faq-item[open] summary::after {
  content: '−';
}

.faq-answer {
  padding: 0 22px 20px;
}

.faq-answer p {
  font-size: 14px;
  color: var(--c-text-muted);
  line-height: 1.8;
}

.faq-answer a {
  color: var(--c-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ===== 联系我们 ===== */
.contact {
  background: linear-gradient(135deg, var(--c-primary) 0%, #1e40af 100%);
  color: var(--c-white);
}

.contact-head {
  text-align: center;
  margin-bottom: 48px;
}

.contact-head h2 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--c-white);
}

.contact-head p {
  font-size: 16px;
  opacity: 0.85;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr 1fr;
  gap: 28px;
  align-items: start;
}

.contact-block {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  padding: 24px;
}

.contact-block h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--c-white);
}

.contact-list li {
  font-size: 13px;
  line-height: 1.7;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.contact-list li:last-child {
  border-bottom: none;
}

.contact-list strong {
  display: inline-block;
  min-width: 74px;
  opacity: 0.8;
}

.contact-list a {
  color: var(--c-white);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.contact-links li {
  margin-bottom: 10px;
}

.contact-links a {
  display: flex;
  flex-direction: column;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  transition: all 0.25s ease;
}

.contact-links a:hover {
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.contact-links strong {
  font-size: 14px;
  color: var(--c-white);
}

.contact-links small {
  font-size: 12px;
  opacity: 0.75;
  margin-top: 2px;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.contact .btn-ghost {
  color: var(--c-white);
  border-color: rgba(255, 255, 255, 0.4);
  padding: 9px 18px;
  font-size: 13px;
}

.contact .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.15);
}

.wechat-cards {
  display: grid;
  gap: 10px;
}

.wechat-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
}

.wechat-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 10px;
  background: #22c55e;
  color: var(--c-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  font-weight: 700;
}

.wechat-card strong {
  display: block;
  font-size: 14px;
  color: var(--c-white);
}

.wechat-card p {
  font-size: 12px;
  opacity: 0.75;
  margin-top: 2px;
}

.wechat-note {
  font-size: 12px;
  line-height: 1.7;
  opacity: 0.75;
  margin-top: 12px;
}

/* ===== Footer ===== */
.footer {
  background: #0f172a;
  color: #cbd5e1;
  padding: 48px 0 32px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1.4fr;
  gap: 40px;
  align-items: start;
  text-align: left;
}

.footer-brand {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.footer-logo {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  flex-shrink: 0;
}

.footer-brand span {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-brand strong {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.5;
}

.footer-brand em {
  font-style: normal;
  font-size: 13px;
  color: #94a3b8;
  font-weight: 400;
}

.footer-brand small {
  font-size: 12px;
  color: #64748b;
}

.footer-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-white);
  margin-bottom: 14px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 10px 20px;
}

.footer-links a {
  font-size: 13px;
  color: #94a3b8;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--c-white);
}

.footer-contact li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 13px;
  color: #94a3b8;
  line-height: 1.7;
  margin-bottom: 8px;
}

.footer-contact span {
  flex: 0 0 44px;
  color: #64748b;
  white-space: nowrap;
}

.footer-contact a {
  color: #94a3b8;
  transition: color 0.2s;
}

.footer-contact a:hover {
  color: var(--c-white);
}

.copyright {
  grid-column: 1 / -1;
  font-size: 13px;
  color: #64748b;
  padding-top: 20px;
  border-top: 1px solid #1e293b;
  margin-top: 8px;
  width: 100%;
  text-align: center;
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .nav-links {
    display: none;
  }
}

@media (max-width: 960px) {
  .hero {
    padding: 56px 0 80px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero-text h1 {
    font-size: 40px;
  }

  .subtitle {
    font-size: 16px;
  }

  .hero-shot {
    max-width: 480px;
    margin: 0 auto;
  }

  .hero-float {
    right: 0;
    bottom: -24px;
  }

  .portal {
    margin-top: -40px;
  }

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

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

  .about-stats {
    grid-template-columns: repeat(2, 1fr);
    margin-top: 36px;
  }

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

  .product-media {
    height: 360px;
  }

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

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

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

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

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

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

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

  .process {
    padding: 24px;
  }

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

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

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

  .section {
    padding: 72px 0;
  }

  .section-head h2 {
    font-size: 28px;
  }
}

@media (max-width: 600px) {
  .nav-links {
    display: none;
  }

  .container {
    padding: 0 16px;
  }

  .hero-text h1 {
    font-size: 32px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 20px 28px;
  }

  .hero-stats strong {
    font-size: 22px;
  }

  .hero-float {
    position: static;
    width: auto;
    max-width: 380px;
    margin: 16px auto 0;
  }

  .portal {
    margin-top: 0;
    padding-top: 32px;
  }

  .portal-grid,
  .feature-grid,
  .learn-grid,
  .platform-grid,
  .shot-grid,
  .scope-grid,
  .tech-grid,
  .service-grid,
  .process-steps {
    grid-template-columns: 1fr;
  }

  .about-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
    padding: 20px;
  }

  .product-media {
    height: 360px;
    padding: 16px;
  }

  .product-body {
    padding: 22px;
  }

  .product-body h3 {
    font-size: 24px;
  }

  .process {
    padding: 20px;
    margin-top: 32px;
  }

  .contact-head {
    margin-bottom: 32px;
  }

  .contact-head h2 {
    font-size: 28px;
  }

  .contact-block {
    padding: 20px;
  }

  .contact-list strong {
    min-width: 68px;
  }

  .shot-item img {
    height: 280px;
  }

  .section {
    padding: 56px 0;
  }

  .section-head h2 {
    font-size: 24px;
  }
}