/* =========================================
   恩施AI官网 - 全局样式
   风格：科技感 · 清新大气 · 政企风
   配色：硒绿 #52B788 / 科技蓝 #1A6FCF / 土家黛青 #2A4A6B
   ========================================= */

/* ---- CSS 变量 ---- */
:root {
  --green:       #52B788;
  --green-light: #74C69D;
  --green-dark:  #2D9B63;
  --blue:        #1A6FCF;
  --blue-light:  #3B8FE8;
  --blue-dark:   #0E4F99;
  --daiqing:     #2A4A6B;
  --daiqing-light: #3D6491;
  --white:       #FFFFFF;
  --bg-light:    #F4F8FB;
  --bg-section:  #EEF4F0;
  --text-dark:   #1A2B3C;
  --text-mid:    #3A5068;
  --text-light:  #6B8099;
  --border:      #D0E6D6;
  --shadow:      0 4px 24px rgba(26,111,207,0.10);
  --shadow-card: 0 2px 16px rgba(42,74,107,0.10);
  --radius:      12px;
  --radius-sm:   8px;
  --transition:  0.3s cubic-bezier(.4,0,.2,1);
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dark);
  background: #fff;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #f0f4f8; }
::-webkit-scrollbar-thumb { background: var(--green-light); border-radius: 3px; }

/* ============================================
   顶部导航
   ============================================ */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 9999;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 16px rgba(26,111,207,0.08);
  transition: var(--transition);
}
#navbar.scrolled {
  box-shadow: 0 4px 24px rgba(26,111,207,0.15);
}
.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: 68px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.nav-logo .logo-icon {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--green) 0%, var(--blue) 100%);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; color: #fff;
}
.nav-logo .logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.nav-logo .logo-name {
  font-size: 18px;
  font-weight: 700;
  background: linear-gradient(90deg, var(--green-dark), var(--blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-logo .logo-sub {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.domain-chip {
  display: inline-block;
  font-size: 9px;
  color: var(--blue);
  background: rgba(22,119,255,0.08);
  padding: 1px 6px;
  border-radius: 3px;
  letter-spacing: 0.3px;
  line-height: 1.4;
}
/* 动态标题 */
.nav-title-rotate {
  font-size: 13px;
  color: var(--text-mid);
  margin-left: 16px;
  padding-left: 16px;
  border-left: 1px solid var(--border);
  line-height: 1.3;
  max-width: 260px;
}
.nav-title-rotate .title-main { font-weight: 600; color: var(--daiqing); font-size: 14px; }
.nav-title-rotate .title-sub  { font-size: 11px; color: var(--text-light); }

nav.nav-links {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
}
nav.nav-links a {
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 14px;
  color: var(--text-mid);
  font-weight: 500;
  transition: var(--transition);
  white-space: nowrap;
}
nav.nav-links a:hover,
nav.nav-links a.active {
  background: linear-gradient(90deg, #e8f5ee, #e0eeff);
  color: var(--blue);
}
nav.nav-links a.nav-cta {
  background: linear-gradient(90deg, var(--green), var(--blue));
  color: #fff;
  padding: 6px 18px;
  border-radius: 20px;
  font-weight: 600;
  margin-left: 8px;
}
nav.nav-links a.nav-cta:hover {
  background: linear-gradient(90deg, var(--green-dark), var(--blue-dark));
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(26,111,207,0.25);
}

/* 汉堡菜单 */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  margin-left: auto;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--daiqing);
  border-radius: 2px;
  transition: var(--transition);
}

/* 移动端菜单 */
.nav-mobile {
  display: none;
  background: #fff;
  border-top: 1px solid var(--border);
  padding: 8px 16px 16px;
  flex-direction: column;
  gap: 2px;
}
.nav-mobile a {
  display: block;
  padding: 10px 16px;
  font-size: 15px;
  color: var(--text-mid);
  border-radius: 8px;
  transition: var(--transition);
}
.nav-mobile a:hover { background: var(--bg-light); color: var(--blue); }
.nav-mobile.open { display: flex; }

/* ============================================
   通用页面布局
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.page-top-spacer { height: 68px; }

/* Section通用样式 */
.section {
  padding: 80px 0;
}
.section-alt {
  background: var(--bg-light);
}
.section-green {
  background: linear-gradient(135deg, #f0faf4 0%, #e8f4fd 100%);
}

/* 标题系统 */
.section-title {
  text-align: center;
  margin-bottom: 56px;
}
.section-title .label {
  display: inline-block;
  background: linear-gradient(90deg, var(--green), var(--blue));
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  padding: 4px 14px;
  border-radius: 12px;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.section-title h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--daiqing);
  margin-bottom: 12px;
  line-height: 1.3;
}
.section-title p {
  font-size: 16px;
  color: var(--text-light);
  max-width: 560px;
  margin: 0 auto;
}
.section-title .divider {
  width: 60px; height: 3px;
  background: linear-gradient(90deg, var(--green), var(--blue));
  border-radius: 2px;
  margin: 16px auto 0;
}

/* 页面英雄区（子页面） */
.page-hero {
  background: linear-gradient(135deg, var(--daiqing) 0%, var(--blue-dark) 50%, var(--green-dark) 100%);
  padding: 80px 0 60px;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  top: -50%; left: -20%;
  width: 140%; height: 200%;
  background: radial-gradient(ellipse, rgba(82,183,136,0.15) 0%, transparent 60%);
}
.page-hero::after {
  content: '';
  position: absolute;
  bottom: -20px; left: 0; right: 0;
  height: 40px;
  background: #fff;
  clip-path: ellipse(55% 100% at 50% 100%);
}
.page-hero .container { position: relative; }
.page-hero .breadcrumb {
  font-size: 13px;
  color: rgba(255,255,255,0.7);
  margin-bottom: 16px;
}
.page-hero .breadcrumb a { color: rgba(255,255,255,0.7); }
.page-hero .breadcrumb a:hover { color: #fff; }
.page-hero h1 {
  font-size: 38px;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.3;
}
.page-hero p {
  font-size: 16px;
  color: rgba(255,255,255,0.85);
  max-width: 600px;
  line-height: 1.8;
}

/* ============================================
   卡片组件
   ============================================ */
.card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(26,111,207,0.15);
}
.card-img {
  width: 100%; aspect-ratio: 16/9;
  object-fit: cover;
  background: linear-gradient(135deg, #e0eeff, #e8f5ee);
  display: flex; align-items: center; justify-content: center;
  font-size: 48px;
  color: var(--blue-light);
  overflow: hidden;
}
.card-body { padding: 20px; }
.card-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  color: var(--green-dark);
  background: #e8f5ee;
  padding: 2px 10px;
  border-radius: 10px;
  margin-bottom: 8px;
}
.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 8px;
  line-height: 1.4;
}
.card-desc {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--blue);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: var(--transition);
}
.card-link:hover { color: var(--green-dark); gap: 8px; }

/* 统计数据卡片 */
.stat-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}
.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--green), var(--blue));
}
.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.stat-card .stat-icon {
  font-size: 32px;
  margin-bottom: 8px;
}
.stat-card .stat-num {
  font-size: 36px;
  font-weight: 800;
  background: linear-gradient(90deg, var(--green-dark), var(--blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}
.stat-card .stat-unit {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-mid);
}
.stat-card .stat-label {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 6px;
}

/* 赛道卡片 */
.track-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.track-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--green), var(--blue));
  transform: scaleX(0);
  transition: var(--transition);
}
.track-card:hover::after { transform: scaleX(1); }
.track-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 36px rgba(26,111,207,0.15);
}
.track-card .track-icon {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, #e8f5ee, #e0eeff);
  display: flex; align-items: center; justify-content: center;
  font-size: 28px;
  margin: 0 auto 14px;
  transition: var(--transition);
}
.track-card:hover .track-icon {
  background: linear-gradient(135deg, var(--green), var(--blue));
  transform: scale(1.1);
}
.track-card:hover .track-icon span { filter: brightness(10); }
.track-card h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--daiqing);
  margin-bottom: 6px;
}
.track-card p {
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.6;
}

/* ============================================
   按钮组件
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 28px;
  border-radius: 24px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  outline: none;
}
.btn-primary {
  background: linear-gradient(90deg, var(--green), var(--blue));
  color: #fff;
  box-shadow: 0 4px 16px rgba(26,111,207,0.25);
}
.btn-primary:hover {
  background: linear-gradient(90deg, var(--green-dark), var(--blue-dark));
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(26,111,207,0.3);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.7);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.15);
  border-color: #fff;
  color: #fff;
}
.btn-outline-blue {
  background: transparent;
  color: var(--blue);
  border: 2px solid var(--blue);
}
.btn-outline-blue:hover {
  background: var(--blue);
  color: #fff;
}

/* ============================================
   图文布局组件
   ============================================ */
.img-text-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
  margin-bottom: 72px;
}
.img-text-row.reverse { direction: rtl; }
.img-text-row.reverse > * { direction: ltr; }
.img-text-row:last-child { margin-bottom: 0; }

.img-block {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, #e0eeff 0%, #e8f5ee 100%);
  display: flex; align-items: center; justify-content: center;
  font-size: 72px;
  position: relative;
}
.img-block img { width: 100%; height: 100%; object-fit: cover; }
.img-block .img-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.img-block .img-placeholder span.emoji { font-size: 64px; }
.img-block .img-placeholder p { font-size: 12px; color: var(--text-light); }

.text-block h3 {
  font-size: 26px;
  font-weight: 700;
  color: var(--daiqing);
  margin-bottom: 12px;
  line-height: 1.4;
}
.text-block .tag-line {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--green-dark);
  background: #e8f5ee;
  padding: 3px 12px;
  border-radius: 12px;
  margin-bottom: 12px;
}
.text-block p {
  font-size: 15px;
  color: var(--text-mid);
  line-height: 1.9;
  margin-bottom: 12px;
}
.text-block .feature-list {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.text-block .feature-list li {
  background: var(--bg-light);
  border: 1px solid var(--border);
  padding: 4px 14px;
  border-radius: 16px;
  font-size: 13px;
  color: var(--text-mid);
  display: flex;
  align-items: center;
  gap: 4px;
}
.text-block .feature-list li::before {
  content: '✦';
  font-size: 10px;
  color: var(--green);
}

/* ============================================
   标签筛选组件
   ============================================ */
.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
  justify-content: center;
}
.filter-tabs button {
  padding: 8px 20px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 14px;
  color: var(--text-mid);
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}
.filter-tabs button:hover,
.filter-tabs button.active {
  background: linear-gradient(90deg, var(--green), var(--blue));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(26,111,207,0.2);
}

/* ============================================
   网格布局
   ============================================ */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.grid-5 { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }

/* ============================================
   页脚
   ============================================ */
#footer {
  background: var(--daiqing);
  color: rgba(255,255,255,0.85);
}
.footer-top {
  padding: 56px 0 40px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 120px;
  gap: 36px;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}
/* 二维码列 */
.footer-qrcode-col h4 {
  font-size: 14px; font-weight: 600; color: #fff;
  margin-bottom: 12px; padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.footer-qrcode-wrap {
  margin-bottom: 8px;
}
.footer-qrcode-img {
  width: 110px; height: 110px;
  border-radius: 8px;
  object-fit: cover;
  border: 2px solid rgba(255,255,255,0.25);
  display: block;
}
.qrcode-tip {
  font-size: 12px;
  color: rgba(255,255,255,0.55);
  line-height: 1.6;
  text-align: center;
  margin-top: 6px;
}
.footer-brand .footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.footer-brand .f-logo-icon {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--green) 0%, var(--blue) 100%);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
}
.footer-brand .f-logo-name {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255,255,255,0.65);
  margin-bottom: 12px;
}
.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.footer-contact a,
.footer-contact span {
  font-size: 13px;
  color: rgba(255,255,255,0.65);
  display: flex;
  align-items: center;
  gap: 6px;
}
.footer-contact a:hover { color: var(--green-light); }
/* 页脚域名展示 */
.footer-domains {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0;
  margin-top: 2px;
}
.footer-domains .footer-domain-label {
  margin-right: 4px;
  font-size: 13px;
}
.footer-domains .domain-sep {
  margin: 0 6px;
  color: rgba(255,255,255,0.3);
  font-size: 13px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.footer-col ul li {
  margin-bottom: 8px;
}
.footer-col ul li a {
  font-size: 13px;
  color: rgba(255,255,255,0.65);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}
.footer-col ul li a::before {
  content: '›';
  font-size: 16px;
  color: var(--green-light);
}
.footer-col ul li a:hover { color: var(--green-light); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 24px;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-bottom .copyright {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}
.footer-bottom .beian {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.footer-bottom .beian a {
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 4px;
}
.footer-bottom .beian a:hover { color: var(--green-light); }
.footer-bottom .beian-sep { color: rgba(255,255,255,0.25); }
/* AI生成低调声明 */
.footer-ai-note {
  text-align: center;
  padding: 10px 24px 14px;
  font-size: 11px;
  color: rgba(255,255,255,0.2);
  letter-spacing: 0.5px;
}

/* ============================================
   动画
   ============================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-10px); }
}
@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
@keyframes titleRotate {
  0%, 20%   { opacity: 1; transform: translateY(0); }
  25%, 95%  { opacity: 0; transform: translateY(-20px); }
  100%      { opacity: 1; transform: translateY(0); }
}
.animate-up {
  animation: fadeInUp 0.7s ease both;
}
.animate-fade {
  animation: fadeIn 0.6s ease both;
}

/* 滚动动画触发 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   新闻列表组件
   ============================================ */
.news-list { list-style: none; }
.news-list li {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.news-list li:hover { padding-left: 8px; }
.news-list .news-img {
  width: 100px; height: 72px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
  background: linear-gradient(135deg, #e0eeff, #e8f5ee);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px;
}
.news-list .news-info { flex: 1; }
.news-list .news-info h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 4px;
  line-height: 1.4;
  transition: var(--transition);
}
.news-list li:hover h4 { color: var(--blue); }
.news-list .news-info p {
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-list .news-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 6px;
  font-size: 12px;
  color: var(--text-light);
}
.news-list .news-tag {
  background: #e8f5ee;
  color: var(--green-dark);
  padding: 1px 8px;
  border-radius: 8px;
  font-size: 11px;
  font-weight: 600;
}

/* ============================================
   联系表单
   ============================================ */
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-mid);
  margin-bottom: 6px;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-dark);
  background: #fff;
  transition: var(--transition);
  font-family: inherit;
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--blue-light);
  box-shadow: 0 0 0 3px rgba(26,111,207,0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* ============================================
   Tag Badges
   ============================================ */
.badge {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
}
.badge-green { background: #e8f5ee; color: var(--green-dark); }
.badge-blue  { background: #e0eeff; color: var(--blue-dark); }
.badge-daiqing { background: #e0e8f0; color: var(--daiqing); }

/* ============================================
   返回顶部
   ============================================ */
#back-to-top {
  position: fixed;
  bottom: 40px; right: 32px;
  width: 44px; height: 44px;
  background: linear-gradient(135deg, var(--green), var(--blue));
  color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  cursor: pointer;
  z-index: 1000;
  box-shadow: 0 4px 16px rgba(26,111,207,0.3);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}
#back-to-top.show { opacity: 1; visibility: visible; }
#back-to-top:hover { transform: translateY(-4px); }

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-5 { grid-template-columns: repeat(3, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr 1fr; gap: 28px; }
  .footer-qrcode-col { grid-column: span 3; display:flex; flex-direction:row; align-items:center; gap:16px; }
  .footer-qrcode-col h4 { min-width:80px; border-bottom:none; padding-bottom:0; margin-bottom:0; }
}

@media (max-width: 768px) {
  .section { padding: 56px 0; }
  .section-title h2 { font-size: 26px; }
  .page-hero h1 { font-size: 28px; }
  .page-hero { padding: 48px 0 32px; }

  .nav-inner { padding: 0 16px; }
  nav.nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .nav-title-rotate { display: none; }
  /* 移动端Logo精简 */
  .nav-logo .logo-name { font-size: 16px; }
  .domain-chip { font-size: 8px; padding: 1px 4px; }

  /* 移动端菜单呈现 */
  .nav-mobile {
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
    max-height: 0; overflow: hidden; transition: max-height 0.3s ease;
    display: flex;
  }
  .nav-mobile.open { max-height: 500px; display: flex; }

  /* 汉堡激活态 */
  .nav-hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-hamburger.active span:nth-child(2) { opacity: 0; }
  .nav-hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .grid-2, .grid-3, .grid-5 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }

  .img-text-row { grid-template-columns: 1fr; gap: 28px; }
  .img-text-row.reverse { direction: ltr; }

  .footer-top { grid-template-columns: 1fr 1fr; gap: 24px; padding: 32px 20px; }
  .footer-qrcode-col { grid-column: span 2; flex-direction:row; display:flex; align-items:center; gap:16px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-ai-note { font-size: 10px; padding: 8px 16px 12px; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .section-title h2 { font-size: 22px; }
  .page-hero h1 { font-size: 24px; }
  .page-hero p { font-size: 13px; }

  /* 小屏隐藏域名标签 */
  .domain-chip { display: none; }
  .nav-logo .logo-name { font-size: 15px; }

  .footer-top { grid-template-columns: 1fr; gap: 20px; }
  .footer-qrcode-col { grid-column: auto; }
  .footer-domains { font-size: 11px; }

  .hero-banner { min-height: 90vh; }
}