/* ==========================================================================
   榜单优选建站 top20lists.com - 全站主样式表
   风格：餐布清新风（浅绿 + 纯白 + 浅蓝）
   布局：阶梯式错落叠加布局，区块相互叠加，高低错落
   纯原生 CSS3，无任何框架依赖
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  /* 主色：浅绿系（清新自然感） */
  --mint-50:  #F0F9F4;
  --mint-100: #E2F4E9;
  --mint-200: #C8E8D5;
  --mint-300: #A5D9BA;
  --mint-400: #7EC89E;
  --mint-500: #5BB37E;
  --mint-600: #449966;
  --mint-700: #357A52;

  /* 辅色：浅蓝系（清爽通透感） */
  --sky-50:  #EFF6FC;
  --sky-100: #DCEEF8;
  --sky-200: #BBDDF0;
  --sky-300: #94C8E4;
  --sky-400: #6FB0D6;
  --sky-500: #4E97C4;
  --sky-600: #3A7BA8;
  --sky-700: #2E6288;

  /* 强调色：薄荷青 */
  --accent-400: #6DD5B0;
  --accent-500: #4BC49A;
  --accent-600: #35A87F;

  /* 中性：纯白与深灰绿 */
  --white:    #FFFFFF;
  --snow:     #FAFCFB;
  --paper:    #F5F9F7;
  --paper-2:  #EEF4F1;
  --ink-900:  #1E3A2F;
  --ink-700:  #3A5A4C;
  --ink-500:  #5C7A6C;
  --ink-300:  #8FA89C;
  --line:     #D8E8DF;
  --line-soft:#E8F2EC;

  /* 餐布格纹色 */
  --gingham-a: rgba(165, 217, 186, 0.18);
  --gingham-b: rgba(187, 221, 240, 0.15);

  /* 功能 */
  --radius-sm: 10px;
  --radius:    18px;
  --radius-lg: 32px;
  --shadow-sm: 0 4px 18px rgba(53, 122, 82, 0.06);
  --shadow:    0 18px 48px rgba(53, 122, 82, 0.10);
  --shadow-lg: 0 32px 72px rgba(53, 122, 82, 0.16);
  --container: 1240px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-700);
  background: var(--snow);
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; border: 0; }
a { color: inherit; text-decoration: none; transition: color .3s var(--ease); }
a:hover { color: var(--mint-600); }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: 0; background: transparent; color: inherit; }
input, textarea, select { font: inherit; color: inherit; }

h1, h2, h3, h4, h5 {
  color: var(--ink-900);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2rem, 4vw, 3.2rem); }
h2 { font-size: clamp(1.6rem, 2.8vw, 2.4rem); }
h3 { font-size: clamp(1.25rem, 1.8vw, 1.6rem); }
h4 { font-size: 1.15rem; }
p  { color: var(--ink-500); }

/* ---------- 容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}
.container-narrow { max-width: 880px; }
.container-wide   { max-width: 1440px; }
section { position: relative; }

/* ==========================================================================
   餐布清新风格纹背景系统
   使用细腻格纹、柔和渐变营造清新治愈氛围
   ========================================================================== */

/* 餐布格纹背景 */
.gingham-bg {
  position: relative;
  overflow: hidden;
}
.gingham-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--gingham-a) 1px, transparent 1px),
    linear-gradient(90deg, var(--gingham-a) 1px, transparent 1px),
    linear-gradient(var(--gingham-b) 1px, transparent 1px),
    linear-gradient(90deg, var(--gingham-b) 1px, transparent 1px);
  background-size: 24px 24px, 24px 24px, 48px 48px, 48px 48px;
  background-position: 0 0, 0 0, 12px 12px, 12px 12px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}
.gingham-bg > * { position: relative; z-index: 1; }

/* 柔和光晕层 */
.soft-glow {
  position: relative;
  overflow: hidden;
}
.soft-glow::before {
  content: "";
  position: absolute;
  top: -15%; left: -5%;
  width: 50%; height: 70%;
  background: radial-gradient(ellipse at center, rgba(165, 217, 186, 0.20) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.soft-glow::after {
  content: "";
  position: absolute;
  bottom: -20%; right: -8%;
  width: 55%; height: 75%;
  background: radial-gradient(ellipse at center, rgba(187, 221, 240, 0.18) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.soft-glow > * { position: relative; z-index: 1; }

/* 阶梯式错落叠加区块 */
.stagger-section {
  position: relative;
  padding: 100px 0;
}
.stagger-section.mint {
  background: linear-gradient(160deg, var(--mint-50) 0%, var(--snow) 50%, var(--sky-50) 100%);
}
.stagger-section.sky {
  background: linear-gradient(160deg, var(--sky-50) 0%, var(--snow) 50%, var(--mint-50) 100%);
}
.stagger-section.pure {
  background: linear-gradient(160deg, var(--white) 0%, var(--paper) 100%);
}
.stagger-section.dark {
  background: linear-gradient(160deg, var(--ink-900) 0%, #2A4A3C 50%, var(--mint-700) 100%);
  color: #D0E4D8;
}
.stagger-section.dark h2, .stagger-section.dark h3 { color: var(--white); }
.stagger-section.dark p { color: rgba(208, 228, 216, 0.8); }

/* 错落叠加卡片组 */
.stagger-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: start;
}
.stagger-cards .card:nth-child(2) { margin-top: 48px; }
.stagger-cards .card:nth-child(3) { margin-top: 24px; }
.stagger-cards .card:nth-child(5) { margin-top: 36px; }
.stagger-cards .card:nth-child(6) { margin-top: 12px; }

/* 清新卡片 */
.fresh-card {
  position: relative;
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 30px;
  transition: all .45s var(--ease);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}
.fresh-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--mint-400), var(--accent-400), var(--sky-300));
}
.fresh-card::after {
  content: "";
  position: absolute;
  top: -40%; right: -20%;
  width: 180px; height: 180px;
  background: radial-gradient(circle, rgba(165, 217, 186, 0.10) 0%, transparent 70%);
  pointer-events: none;
}
.fresh-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
  border-color: var(--mint-200);
}

/* 带格纹装饰的卡片 */
.gingham-card {
  position: relative;
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all .4s var(--ease);
  border: 1px solid var(--line-soft);
  overflow: hidden;
}
.gingham-card::before {
  content: "";
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 60px;
  background-image:
    linear-gradient(var(--gingham-a) 1px, transparent 1px),
    linear-gradient(90deg, var(--gingham-a) 1px, transparent 1px);
  background-size: 16px 16px;
  opacity: 0.5;
  pointer-events: none;
}
.gingham-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

/* ==========================================================================
   顶部导航
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: all .35s var(--ease);
}
.site-header.scrolled {
  background: rgba(255, 255, 255, 0.96);
  border-bottom-color: var(--line-soft);
  box-shadow: 0 4px 24px rgba(53, 122, 82, 0.06);
}
.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.brand img { width: 40px; height: 40px; border-radius: 10px; }
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.brand-text strong {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--ink-900);
  letter-spacing: -0.02em;
}
.brand-text small {
  font-size: 0.65rem;
  color: var(--ink-300);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: 2px;
}

/* 主导航 */
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.main-nav > li {
  position: relative;
}
.main-nav > li > a {
  display: block;
  padding: 10px 14px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink-700);
  border-radius: 8px;
  transition: all .25s var(--ease);
}
.main-nav > li > a:hover {
  color: var(--mint-600);
  background: var(--mint-50);
}
.main-nav > li.active > a {
  color: var(--mint-600);
  font-weight: 600;
}
.main-nav > li.active > a::after {
  content: "";
  position: absolute;
  bottom: 2px; left: 50%;
  transform: translateX(-50%);
  width: 20px; height: 3px;
  background: var(--mint-400);
  border-radius: 2px;
}

/* 下拉菜单 */
.has-sub > a::after {
  content: "";
  display: inline-block;
  width: 0; height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  margin-left: 6px;
  vertical-align: middle;
  opacity: 0.6;
}
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  min-width: 260px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--line-soft);
  padding: 12px;
  opacity: 0;
  visibility: hidden;
  transition: all .3s var(--ease);
  z-index: 100;
}
.has-sub:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.dropdown-menu li a {
  display: block;
  padding: 10px 14px;
  font-size: 0.88rem;
  color: var(--ink-700);
  border-radius: 8px;
  transition: all .2s var(--ease);
}
.dropdown-menu li a:hover {
  background: var(--mint-50);
  color: var(--mint-600);
  padding-left: 18px;
}

/* 导航 CTA */
.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 10px 22px;
  background: linear-gradient(135deg, var(--mint-500), var(--accent-500));
  color: var(--white) !important;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: 100px;
  transition: all .3s var(--ease);
  flex-shrink: 0;
  box-shadow: 0 4px 16px rgba(91, 179, 126, 0.25);
}
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(91, 179, 126, 0.35);
  color: var(--white) !important;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ink-700);
  border-radius: 2px;
  transition: all .3s var(--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); }

/* 移动端抽屉 */
.mobile-drawer {
  position: fixed;
  top: 0; right: -320px;
  width: 300px;
  height: 100vh;
  background: var(--white);
  box-shadow: -8px 0 40px rgba(0,0,0,0.1);
  z-index: 1100;
  padding: 80px 20px 30px;
  overflow-y: auto;
  transition: right .35s var(--ease);
}
.mobile-drawer.open { right: 0; }
.mobile-drawer > li { margin-bottom: 4px; }
.mobile-drawer > li > a {
  display: block;
  padding: 12px 16px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-700);
  border-radius: 10px;
  transition: all .2s;
}
.mobile-drawer > li > a:hover {
  background: var(--mint-50);
  color: var(--mint-600);
}
.mobile-sub {
  padding-left: 16px;
  margin-top: 4px;
}
.mobile-sub li a {
  display: block;
  padding: 8px 14px;
  font-size: 0.85rem;
  color: var(--ink-500);
  border-radius: 8px;
}
.mobile-sub li a:hover { background: var(--mint-50); color: var(--mint-600); }

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(30, 58, 47, 0.4);
  backdrop-filter: blur(4px);
  z-index: 1050;
  opacity: 0;
  visibility: hidden;
  transition: all .3s;
}
.overlay.show { opacity: 1; visibility: visible; }

/* ==========================================================================
   按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: 100px;
  transition: all .3s var(--ease);
  cursor: pointer;
  border: 0;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--mint-500), var(--accent-500));
  color: var(--white);
  box-shadow: 0 4px 18px rgba(91, 179, 126, 0.28);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(91, 179, 126, 0.38);
  color: var(--white);
}
.btn-sky {
  background: linear-gradient(135deg, var(--sky-400), var(--sky-500));
  color: var(--white);
  box-shadow: 0 4px 18px rgba(78, 151, 196, 0.25);
}
.btn-sky:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(78, 151, 196, 0.35);
  color: var(--white);
}
.btn-outline {
  background: transparent;
  color: var(--mint-600);
  border: 2px solid var(--mint-300);
}
.btn-outline:hover {
  background: var(--mint-50);
  border-color: var(--mint-400);
  color: var(--mint-700);
}
.btn-ghost {
  background: var(--white);
  color: var(--ink-700);
  border: 1px solid var(--line);
}
.btn-ghost:hover {
  border-color: var(--mint-300);
  color: var(--mint-600);
}
.btn-lg { padding: 15px 36px; font-size: 1rem; }
.btn-sm { padding: 8px 18px; font-size: 0.82rem; }

/* ==========================================================================
   通用区块
   ========================================================================== */
.section { padding: 90px 0; position: relative; }
.section-tight { padding: 60px 0; }
.section-sm { padding: 40px 0; }

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}
.section-head.left { text-align: left; margin-left: 0; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--mint-50);
  color: var(--mint-600);
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: 100px;
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}
.eyebrow.sky { background: var(--sky-50); color: var(--sky-600); }
.eyebrow.accent { background: rgba(109, 213, 176, 0.15); color: var(--accent-600); }
.section-head h2 { margin-bottom: 16px; }
.section-head p { font-size: 1.02rem; }

/* 榜单标记图标 */
.rank-mark {
  display: inline-grid;
  place-items: center;
  width: 28px; height: 28px;
  background: linear-gradient(135deg, var(--mint-400), var(--accent-400));
  color: var(--white);
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 700;
}

/* ==========================================================================
   Hero Banner
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
  background: linear-gradient(160deg, var(--mint-50) 0%, var(--white) 40%, var(--sky-50) 100%);
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--gingham-a) 1px, transparent 1px),
    linear-gradient(90deg, var(--gingham-a) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.4;
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  top: 10%; right: -5%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(165, 217, 186, 0.25) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero-content h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.6rem);
  line-height: 1.15;
  margin-bottom: 24px;
}
.hero-content h1 .highlight {
  background: linear-gradient(135deg, var(--mint-500), var(--accent-500));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-content p {
  font-size: 1.1rem;
  margin-bottom: 36px;
  max-width: 520px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.hero-stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}
.hero-stat .num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--mint-600);
  line-height: 1;
}
.hero-stat .label {
  font-size: 0.85rem;
  color: var(--ink-500);
  margin-top: 6px;
}

/* Hero 视觉区 */
.hero-visual {
  position: relative;
}
.hero-visual .main-img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  position: relative;
  z-index: 2;
}
.hero-visual .float-card {
  position: absolute;
  background: var(--white);
  border-radius: var(--radius);
  padding: 18px 22px;
  box-shadow: var(--shadow);
  z-index: 3;
}
.hero-visual .float-card.top-left {
  top: -20px; left: -30px;
}
.hero-visual .float-card.bottom-right {
  bottom: -20px; right: -20px;
}
.float-card .fc-title {
  font-size: 0.82rem;
  color: var(--ink-500);
  margin-bottom: 4px;
}
.float-card .fc-value {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--mint-600);
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  background: linear-gradient(160deg, var(--ink-900) 0%, #2A4A3C 100%);
  color: rgba(208, 228, 216, 0.8);
  padding: 70px 0 0;
  position: relative;
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--mint-400), var(--accent-400), var(--sky-300));
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 50px;
}
.footer-col h4 {
  color: var(--white);
  font-size: 1rem;
  margin-bottom: 20px;
  font-weight: 700;
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul li a {
  color: rgba(208, 228, 216, 0.7);
  font-size: 0.88rem;
  transition: all .2s;
}
.footer-col ul li a:hover {
  color: var(--mint-300);
  padding-left: 4px;
}
.footer-brand .brand { color: var(--white); margin-bottom: 16px; }
.footer-brand .brand-text strong { color: var(--white); }
.footer-brand .brand-text small { color: rgba(208, 228, 216, 0.5); }
.footer-brand > p {
  color: rgba(208, 228, 216, 0.65);
  font-size: 0.88rem;
  line-height: 1.7;
}
.footer-contact li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 14px;
  font-size: 0.85rem;
  color: rgba(208, 228, 216, 0.7);
}
.footer-contact .ic {
  flex-shrink: 0;
  color: var(--mint-300);
  margin-top: 3px;
}
.footer-social {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}
.footer-social a {
  display: grid;
  place-items: center;
  width: 36px; height: 36px;
  background: rgba(255,255,255,0.08);
  border-radius: 10px;
  color: rgba(208, 228, 216, 0.8);
  transition: all .25s;
}
.footer-social a:hover {
  background: var(--mint-500);
  color: var(--white);
  transform: translateY(-2px);
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
  color: rgba(208, 228, 216, 0.5);
}
.footer-bottom a {
  color: rgba(208, 228, 216, 0.6);
  transition: color .2s;
}
.footer-bottom a:hover { color: var(--mint-300); }
.footer-icp span { margin: 0 8px; }

/* ==========================================================================
   滚动渐入（默认可见，确保内容始终可访问）
   ========================================================================== */
.reveal {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left {
  opacity: 1;
  transform: translateX(0);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal-left.in { opacity: 1; transform: translateX(0); }
.reveal-right {
  opacity: 1;
  transform: translateX(0);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal-right.in { opacity: 1; transform: translateX(0); }

/* ==========================================================================
   工具类
   ========================================================================== */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }
.gap-4 { gap: 32px; }
.text-center { text-align: center; }
.text-left { text-align: left; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.w-full { width: 100%; }
.hidden { display: none; }

/* 标签 */
.tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--mint-50);
  color: var(--mint-600);
  font-size: 0.78rem;
  font-weight: 500;
  border-radius: 100px;
}
.tag.sky { background: var(--sky-50); color: var(--sky-600); }
.tag.accent { background: rgba(109, 213, 176, 0.15); color: var(--accent-600); }

/* 表单 */
.form-control {
  width: 100%;
  padding: 12px 18px;
  border: 1.5px solid var(--line);
  border-radius: 12px;
  font-size: 0.92rem;
  background: var(--white);
  transition: all .25s var(--ease);
  outline: none;
}
.form-control:focus {
  border-color: var(--mint-400);
  box-shadow: 0 0 0 4px rgba(165, 217, 186, 0.2);
}
textarea.form-control { resize: vertical; min-height: 120px; }

/* CTA Banner */
.cta-banner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 32px;
  padding: 48px;
  background: linear-gradient(135deg, var(--mint-600), var(--accent-500));
  border-radius: var(--radius-lg);
  color: var(--white);
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: "";
  position: absolute;
  top: -50%; right: -10%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  border-radius: 50%;
}
.cta-banner h2, .cta-banner h3 { color: var(--white); }
.cta-banner p { color: rgba(255,255,255,0.85); }
.cta-banner .btn {
  background: var(--white);
  color: var(--mint-600);
}
.cta-banner .btn:hover {
  background: var(--mint-50);
  color: var(--mint-700);
}

/* 返回顶部 */
.back-to-top {
  position: fixed;
  right: 24px; bottom: 24px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--mint-500), var(--accent-500));
  color: var(--white);
  display: grid;
  place-items: center;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transition: all .3s;
  z-index: 900;
}
.back-to-top.show { opacity: 1; visibility: visible; }
.back-to-top:hover { transform: translateY(-3px); color: var(--white); }