/* 🌪️ AigoGoAI - 跨境物流 · 财务模型预测
   视觉升级 v2 — 更精致、更有呼吸感
*/
:root {
  --primary: #1B4965;
  --primary-light: #468FAF;
  --primary-dark: #0D2C40;
  --accent: #62B6CB;
  --accent-light: #BEE9E8;
  --secondary: #5C9EAD;
  --success: #2D6A4F;
  --warning: #E9C46A;
  --danger: #E76F51;
  --dark: #1A1A2E;
  --gray-900: #2D3436;
  --gray-700: #636E72;
  --gray-500: #B2BEC3;
  --gray-300: #DFE6E9;
  --gray-100: #F0F4F8;
  --gray-50: #F7FAFC;
  --white: #FFFFFF;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.1);
  --shadow-xl: 0 12px 48px rgba(0,0,0,0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --max-width: 1200px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

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

body {
  font-family: var(--font-sans);
  color: var(--dark);
  background: var(--gray-50);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* ===== 导航栏 ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(223,230,233,0.6);
  transition: all 0.3s;
}
.navbar.scrolled {
  background: rgba(255,255,255,0.97);
  box-shadow: 0 1px 12px rgba(0,0,0,0.06);
  backdrop-filter: blur(20px);
}
.navbar-container {
  max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.navbar-logo {
  font-size: 1.35rem; font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  display: flex; align-items: center; gap: 0.5rem;
}
.navbar-menu { display: flex; list-style: none; gap: 2.25rem; }
.navbar-menu a {
  text-decoration: none; color: var(--gray-700);
  font-size: 0.9rem; font-weight: 500;
  transition: color 0.2s;
  position: relative;
  letter-spacing: 0.3px;
}
.navbar-menu a:hover { color: var(--primary); }
.navbar-menu a::after {
  content: ''; position: absolute; bottom: -4px; left: 0;
  width: 0; height: 2px; background: var(--primary);
  transition: width 0.3s; border-radius: 1px;
}
.navbar-menu a:hover::after,
.navbar-menu a.active::after { width: 100%; }
.navbar-menu a.active { color: var(--primary); font-weight: 600; }
.navbar-actions { display: flex; gap: 0.75rem; }

/* ===== 汉堡菜单 ===== */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--primary); border-radius: 2px;
  transition: all 0.3s;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.6rem; border-radius: var(--radius-xs);
  font-size: 0.9rem; font-weight: 600; text-decoration: none;
  transition: all 0.25s; cursor: pointer; border: none;
  letter-spacing: 0.3px;
}
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(27,73,101,0.35); }
.btn-secondary { background: var(--white); color: var(--primary); border: 2px solid var(--primary); }
.btn-secondary:hover { background: var(--gray-50); transform: translateY(-1px); }
.btn-sm { padding: 0.45rem 1.1rem; font-size: 0.82rem; }
.btn-lg { padding: 0.9rem 2.2rem; font-size: 1rem; }
.btn-white { background: var(--white); color: var(--primary); }
.btn-white:hover { background: var(--gray-50); transform: translateY(-1px); box-shadow: 0 4px 14px rgba(255,255,255,0.25); }
.btn-ghost { background: transparent; color: rgba(255,255,255,0.85); border: 2px solid rgba(255,255,255,0.35); }
.btn-ghost:hover { border-color: rgba(255,255,255,0.8); color: var(--white); transform: translateY(-1px); }
.btn-back {
  display: inline-flex; align-items: center; gap: 0.4rem;
  color: var(--primary); text-decoration: none;
  font-size: 0.9rem; font-weight: 500; margin-bottom: 2rem;
}
.btn-back:hover { color: var(--primary-dark); }

/* ===== 子页顶部操作栏 ===== */
.page-top-bar {
  display: flex; align-items: center; gap: 0.75rem;
  margin-bottom: 1.5rem; flex-wrap: wrap;
}
.page-top-bar .btn-back { margin-bottom: 0; }

.btn-home-bar {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.4rem 1.2rem;
  background: var(--primary); color: #fff;
  border-radius: 999px; font-size: 0.85rem;
  font-weight: 600; text-decoration: none;
  transition: all 0.2s;
}
.btn-home-bar:hover {
  background: var(--primary-dark); color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* ===== 回到顶部 ===== */
.back-to-top {
  position: fixed; bottom: 2rem; right: 2rem;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary); color: #fff;
  border: none; cursor: pointer;
  font-size: 1.2rem; display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0; visibility: hidden;
  transform: translateY(12px);
  transition: all 0.3s;
  z-index: 999;
}
.back-to-top.visible {
  opacity: 1; visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-3px);
}

/* ===== Hero ===== */
.hero {
  padding: 160px 0 90px;
  background: linear-gradient(140deg, #1B4965 0%, #225F7A 35%, #468FAF 65%, #62B6CB 100%);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background:
    radial-gradient(ellipse at 15% 75%, rgba(190,233,232,0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 85% 25%, rgba(98,182,203,0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(255,255,255,0.03) 0%, transparent 70%);
}
.hero::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--accent-light), var(--accent), var(--primary-light), var(--primary));
}
.hero .container { position: relative; z-index: 1; text-align: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(6px);
  padding: 0.4rem 1.2rem;
  border-radius: 50px; font-size: 0.82rem; color: var(--white);
  margin-bottom: 1.5rem; border: 1px solid rgba(255,255,255,0.12);
}
.hero-title {
  font-size: 3.2rem; font-weight: 800; color: var(--white);
  line-height: 1.15; margin-bottom: 1rem;
}
.hero-title .highlight { color: var(--accent-light); }
.hero-subtitle {
  font-size: 1.15rem; color: rgba(255,255,255,0.78);
  margin-bottom: 2.5rem; font-weight: 400; max-width: 620px;
  margin-left: auto; margin-right: auto; line-height: 1.7;
}
.hero-cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.hero-features {
  display: flex; justify-content: center; gap: 3rem;
  margin-top: 3.5rem; flex-wrap: wrap;
}
.hero-feature { text-align: center; }
.hero-feature-icon { font-size: 1.5rem; margin-bottom: 0.25rem; }
.hero-feature-text {
  font-size: 0.82rem; color: rgba(255,255,255,0.7);
  letter-spacing: 0.5px;
}

/* ===== 区块 ===== */
.section { padding: 80px 0; }
.section-alt { background: #fff; }
.section-gray { background: var(--gray-50); }
.section-title {
  text-align: center; font-size: 2rem; font-weight: 800;
  margin-bottom: 0.5rem; color: var(--primary-dark);
  letter-spacing: -0.5px;
}
.section-subtitle {
  text-align: center; font-size: 1rem;
  color: var(--gray-500); margin-bottom: 3rem;
}

/* Grid */
.grid { display: grid; gap: 1.5rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

/* ===== 统计卡片 ===== */
.stat-card {
  background: #fff; border-radius: var(--radius);
  padding: 2.5rem 2rem; text-align: center;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(223,230,233,0.5);
  transition: all 0.3s;
  position: relative; overflow: hidden;
}
.stat-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0; transition: opacity 0.3s;
}
.stat-card:hover { box-shadow: var(--shadow-xl); transform: translateY(-4px); }
.stat-card:hover::before { opacity: 1; }
.stat-number {
  font-size: 2.8rem; font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat-label { font-size: 0.9rem; color: var(--gray-700); margin-top: 0.5rem; }
.stat-sub { font-size: 0.8rem; color: var(--gray-500); margin-top: 0.25rem; }

/* ===== 趋势卡片 ===== */
.trend-card {
  background: #fff; border-radius: var(--radius);
  padding: 1.75rem; box-shadow: var(--shadow-md);
  border: 1px solid rgba(223,230,233,0.4);
  transition: all 0.3s;
  position: relative; overflow: hidden;
}
.trend-card::after {
  content: ''; position: absolute; bottom: 0; left: 1.5rem; right: 1.5rem;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-light), transparent);
  opacity: 0; transition: all 0.3s;
}
.trend-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}
.trend-card:hover::after { opacity: 1; }
.trend-card-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.75rem; display: flex; align-items: center; gap: 0.5rem; }
.trend-card-text { color: var(--gray-700); line-height: 1.7; font-size: 0.9rem; }

/* ===== 痛点卡片 ===== */
.pain-card {
  background: #fff; border-radius: var(--radius);
  padding: 1.75rem; box-shadow: var(--shadow-md);
  border: 1px solid rgba(223,230,233,0.4);
  border-left: 4px solid var(--primary);
  transition: all 0.3s;
  position: relative;
}
.pain-card:hover { box-shadow: var(--shadow-xl); transform: translateY(-3px); border-left-width: 5px; }
.pain-card-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.5rem; }
.pain-card-text { color: var(--gray-700); font-size: 0.9rem; line-height: 1.6; }

/* ===== 模型卡片 ===== */
.model-grid { display: grid; gap: 1.5rem; }
.model-grid-3 { grid-template-columns: repeat(3, 1fr); }
.model-grid-5 { grid-template-columns: repeat(5, 1fr); }

.model-card {
  background: #fff; border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(223,230,233,0.4);
  overflow: hidden; transition: all 0.35s;
  display: flex; flex-direction: column;
  position: relative;
}
.model-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent-light));
  opacity: 0; transition: opacity 0.35s;
}
.model-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-6px);
  border-color: var(--accent);
}
.model-card:hover::before { opacity: 1; }
.model-card-bg {
  padding: 2rem; flex: 1;
  display: flex; flex-direction: column;
}
.model-card-icon { font-size: 2.2rem; margin-bottom: 1rem; }
.model-card-title {
  font-size: 1.15rem; font-weight: 700; margin-bottom: 0.6rem;
  color: var(--primary-dark);
}
.model-card-desc { color: var(--gray-700); line-height: 1.7; flex: 1; font-size: 0.9rem; margin-bottom: 1rem; }
.model-card-footer {
  padding: 1rem 2rem;
  border-top: 1px solid var(--gray-300);
  background: var(--gray-50);
}
.model-card-footer a {
  display: flex; align-items: center; justify-content: space-between;
  color: var(--primary); text-decoration: none; font-weight: 600; font-size: 0.9rem;
}
.model-card-footer a:hover { color: var(--primary-dark); gap: 0.5rem; }
.model-card-tags { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.model-card-tag {
  background: var(--gray-300); padding: 0.2rem 0.7rem;
  border-radius: 50px; font-size: 0.75rem; color: var(--gray-700);
}

/* ===== 模型详情页 ===== */
.model-detail {
  padding-top: 100px;
  padding-bottom: 60px;
  max-width: 1400px; margin: 0 auto;
}
@media (max-width: 768px) {
  .model-detail { padding: 80px 16px 40px; }
  .model-detail-header { margin-bottom: 2rem; }
}
.model-detail-header {
  text-align: center; margin-bottom: 2.5rem;
}
.model-detail-icon { font-size: 3rem; margin-bottom: 1rem; }
.model-detail-title {
  font-size: 2rem; font-weight: 800;
  color: var(--primary-dark); margin-bottom: 0.5rem;
}
.model-detail-subtitle { color: var(--gray-500); font-size: 1rem; }
.model-detail-section {
  background: #fff; border-radius: var(--radius);
  padding: 2rem; margin-bottom: 1.5rem;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(223,230,233,0.4);
}
.model-detail-section h3 {
  font-size: 1.15rem; font-weight: 700; color: var(--primary-dark);
  margin-bottom: 1rem; padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--gray-300);
}

/* ===== 表单控件 ===== */
.form-group { margin-bottom: 1.25rem; }
.form-label {
  display: block; font-size: 0.85rem; font-weight: 600;
  color: var(--gray-900); margin-bottom: 0.4rem;
}
.form-input, .form-select, .form-textarea {
  width: 100%; padding: 0.6rem 0.85rem;
  border: 1.5px solid var(--gray-300); border-radius: var(--radius-xs);
  font-size: 0.9rem; transition: all 0.2s; background: var(--white);
  color: var(--dark);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none; border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(98,182,203,0.15);
}
.form-textarea { min-height: 80px; resize: vertical; }
.form-hint { font-size: 0.78rem; color: var(--gray-500); margin-top: 0.3rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

/* Toggle 开关 */
.toggle-group { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.toggle-btn {
  padding: 0.4rem 1rem; border-radius: 50px;
  border: 1.5px solid var(--gray-300);
  background: var(--white); color: var(--gray-700);
  font-size: 0.82rem; cursor: pointer; transition: all 0.2s;
}
.toggle-btn:hover { border-color: var(--primary-light); }
.toggle-btn.active {
  background: var(--primary); color: var(--white); border-color: var(--primary);
}

/* ===== 场景卡片 ===== */
.scenario-card {
  background: #fff; border-radius: var(--radius);
  padding: 2rem; box-shadow: var(--shadow-md);
  border: 1px solid rgba(223,230,233,0.4);
  flex: 1; min-width: 240px; text-align: center;
  transition: all 0.3s;
  position: relative; overflow: hidden;
}
.scenario-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--primary-light));
  opacity: 0; transition: opacity 0.3s;
}
.scenario-card:hover {
  box-shadow: var(--shadow-xl); transform: translateY(-4px);
}
.scenario-card:hover::before { opacity: 1; }
.scenario-icon { font-size: 2.5rem; margin-bottom: 0.75rem; }
.scenario-title { font-weight: 700; font-size: 1.05rem; color: var(--primary-dark); margin-bottom: 0.75rem; }
.scenario-desc { font-size: 0.9rem; color: var(--gray-700); line-height: 1.7; }

/* ===== CTA ===== */
.cta-section {
  background: linear-gradient(140deg, var(--primary) 0%, var(--primary-light) 100%);
  padding: 80px 0; text-align: center; color: var(--white);
  position: relative; overflow: hidden;
}
.cta-section::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(ellipse at 50% 50%, rgba(255,255,255,0.05) 0%, transparent 60%);
}
.cta-section .container { position: relative; z-index: 1; }
.cta-title { font-size: 2.2rem; font-weight: 800; margin-bottom: 0.75rem; }
.cta-desc { font-size: 1.05rem; opacity: 0.9; margin-bottom: 2rem; max-width: 550px; margin-left: auto; margin-right: auto; line-height: 1.7; }

/* ===== 页脚 ===== */
.footer {
  background: var(--primary-dark); color: var(--white);
  padding: 50px 0 25px;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem; margin-bottom: 2.5rem;
}
.footer-title {
  font-size: 1rem; font-weight: 700;
  margin-bottom: 1rem; color: var(--accent-light);
}
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 0.4rem; }
.footer-links a {
  color: rgba(255,255,255,0.5); text-decoration: none;
  transition: all 0.2s; font-size: 0.88rem;
}
.footer-links a:hover { color: var(--accent); padding-left: 2px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 1.5rem; text-align: center;
  color: rgba(255,255,255,0.35); font-size: 0.85rem;
}

/* ===== 动画 ===== */
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(27,73,101,0.3); }
  50% { box-shadow: 0 0 0 15px rgba(27,73,101,0); }
}
.pulse { animation: pulse 2s infinite; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-up { opacity: 0; animation: fadeUp 0.5s ease-out forwards; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* ===== 步骤条 ===== */
.steps { display: flex; gap: 1.5rem; counter-reset: step; justify-content: center; flex-wrap: wrap; }
.step {
  background: #fff; border-radius: var(--radius);
  padding: 2rem 1.5rem; box-shadow: var(--shadow-md);
  border: 1px solid rgba(223,230,233,0.4);
  flex: 1; min-width: 200px; max-width: 280px;
  text-align: center; position: relative;
  counter-increment: step;
  transition: all 0.3s;
}
.step:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-3px);
}
.step::before {
  content: counter(step);
  position: absolute; top: -14px; left: 50%;
  transform: translateX(-50%);
  width: 30px; height: 30px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--white);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.82rem; font-weight: 700;
  box-shadow: 0 2px 8px rgba(27,73,101,0.3);
}
.step-icon { font-size: 2rem; margin-bottom: 0.5rem; margin-top: 0.5rem; }
.step-title { font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; color: var(--primary-dark); }
.step-desc { color: var(--gray-700); font-size: 0.88rem; line-height: 1.6; }

/* ===== 为什么选我们 ===== */
.reason-card {
  padding: 1.75rem; background: #fff;
  border-radius: var(--radius); box-shadow: var(--shadow-md);
  border: 1px solid rgba(223,230,233,0.4);
  transition: all 0.3s; position: relative; overflow: hidden;
}
.reason-card::after {
  content: ''; position: absolute; top: 0; right: 0;
  width: 60px; height: 60px;
  background: linear-gradient(135deg, transparent 50%, rgba(98,182,203,0.08) 50%);
  border-radius: 0 0 0 60px;
}
.reason-card:hover { box-shadow: var(--shadow-xl); transform: translateY(-3px); }
.reason-title { font-size: 1.1rem; font-weight: 700; color: var(--primary-dark); margin-bottom: 1rem; }
.check-list { list-style: none; }
.check-list li {
  padding: 0.4rem 0; position: relative;
  padding-left: 1.75rem;
  color: var(--gray-700); line-height: 1.5; font-size: 0.9rem;
}
.check-list li::before {
  content: '✓'; color: var(--success); font-weight: 700;
  position: absolute; left: 0; font-size: 1.1rem;
}

/* ===== 双栏布局（左参数说明 + 右表单） ===== */
.model-layout {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 1.5rem; align-items: start;
}
.model-params {
  background: #fff; border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(223,230,233,0.4);
  position: sticky; top: 84px;
}
.model-params-title {
  font-size: 1rem; font-weight: 700;
  color: var(--primary-dark); margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--gray-300);
  display: flex; align-items: center; gap: 0.5rem;
}
.model-params-item {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--gray-100);
}
.model-params-item:last-child { border-bottom: none; }
.model-params-item-label {
  font-size: 0.8rem; font-weight: 600;
  color: var(--primary); margin-bottom: 0.2rem;
}
.model-params-item-val {
  font-size: 0.88rem; color: var(--gray-700);
}
.model-params-item-hint {
  font-size: 0.75rem; color: var(--gray-500);
  margin-top: 0.15rem;
}
.model-form-area {
  background: #fff; border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(223,230,233,0.4);
}
.model-form-area h3 {
  font-size: 1rem; font-weight: 700;
  color: var(--primary-dark); margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--gray-300);
}

@media (max-width: 768px) {
  .model-layout { grid-template-columns: 1fr; }
  .model-params { position: static; }
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .hero-title { font-size: 2rem; }
  .hero-subtitle { font-size: 1rem; }
  .section-title { font-size: 1.5rem; }
  .section { padding: 60px 0; }
  .grid-3, .grid-2, .model-grid-3 { grid-template-columns: 1fr; }
  .stat-number { font-size: 2rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 1.5rem; }
  .navbar-menu { display: none; }
  .navbar-menu.open { display: flex; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--white); padding: 1rem 2rem; box-shadow: var(--shadow-md); gap: 1rem; }
  .hamburger { display: flex; }
  .hero { padding: 120px 0 60px; }
  .model-detail-title { font-size: 1.5rem; }
  .form-row { grid-template-columns: 1fr; }
}