/* =========================================
   OSB 板材公司官网 — 风格指南 & 全局样式
   Design Token & Global Styles
   ========================================= */

/* ----- Design Tokens (CSS Custom Properties) ----- */
:root {
  /* 主色调 — 深邃森林绿 Deep Forest */
  --color-primary: #0D2B1D;
  --color-primary-light: #1B4D32;
  --color-primary-dark: #071A11;

  /* 辅色 — 香槟金 Champagne Gold（更内敛高级） */
  --color-accent: #C4A265;
  --color-accent-light: #D4BC86;
  --color-accent-dark: #A88844;

  /* 中性色 — 温暖米灰 Warm Neutrals */
  --color-bg: #F8F6F1;
  --color-bg-alt: #EFEBE3;
  --color-text: #1A1A1A;
  --color-text-secondary: #5A5A5A;
  --color-text-light: #8A8A8A;
  --color-white: #FFFFFF;
  --color-border: rgba(0, 0, 0, 0.06);

  /* 渐变 */
  --gradient-hero: linear-gradient(160deg, #071A11 0%, #0D2B1D 35%, #1B4D32 65%, #0D2B1D 100%);
  --gradient-accent: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
  --gradient-card: linear-gradient(165deg, var(--color-white), var(--color-bg));

  /* 字体 — 英文字体：Cormorant Garamond（典雅衬线） / 中文标题：Noto Serif SC */
  --font-zh: 'PingFang SC', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-en: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Cormorant Garamond', 'Noto Serif SC', 'Noto Sans SC', Georgia, serif;

  /* 字重 */
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  /* 字号 */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3.5rem;
  --text-6xl: 4.5rem;

  /* 间距 */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 30px rgba(196, 162, 101, 0.2);

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* 导航高度 */
  --nav-height: 80px;
}

/* 暗色模式 */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #111111;
    --color-bg-alt: #1A1A1A;
    --color-text: #F0F0F0;
    --color-text-secondary: #AAAAAA;
    --color-text-light: #777777;
    --color-white: #1E1E1E;
    --color-border: rgba(255, 255, 255, 0.08);
    --gradient-card: linear-gradient(145deg, #1E1E1E, #181818);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.6);
  }
}

/* ----- Reset & Base ----- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-zh);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base);
}

ul, ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ----- Typography ----- */
.section-label {
  display: inline-block;
  font-family: var(--font-en);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: 4px;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
  position: relative;
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
  line-height: 1.25;
  margin-bottom: var(--space-6);
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 560px;
  line-height: 1.8;
}

/* ----- Gold Divider（金色分割线）----- */
.section-divider {
  width: 48px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  margin: var(--space-6) auto var(--space-8);
  border-radius: 2px;
  opacity: 0.8;
}

.section-divider.left {
  margin: var(--space-6) 0 var(--space-8);
}

/* ----- Decorative Corner Accent（装饰角标）----- */
.corner-accent {
  position: relative;
}

.corner-accent::before {
  content: '';
  position: absolute;
  top: -12px;
  left: -12px;
  width: 32px;
  height: 32px;
  border-top: 2px solid var(--color-accent);
  border-left: 2px solid var(--color-accent);
  opacity: 0.3;
  pointer-events: none;
}

.corner-accent::after {
  content: '';
  position: absolute;
  bottom: -12px;
  right: -12px;
  width: 32px;
  height: 32px;
  border-bottom: 2px solid var(--color-accent);
  border-right: 2px solid var(--color-accent);
  opacity: 0.3;
  pointer-events: none;
}

/* ----- Subtle Texture Overlay（微纹理覆盖层）----- */
.texture-overlay {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 30% 40%, rgba(196, 162, 101, 0.03) 0%, transparent 60%),
    radial-gradient(circle at 70% 80%, rgba(196, 162, 101, 0.02) 0%, transparent 50%);
  pointer-events: none;
}

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

.text-center .section-subtitle {
  margin: 0 auto;
}

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 14px 32px;
  font-family: var(--font-zh);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.15);
  transform: translateX(-100%);
  transition: transform 0.4s ease;
}

.btn:hover::after {
  transform: translateX(0);
}

.btn-primary {
  background: var(--gradient-accent);
  color: var(--color-white);
  box-shadow: 0 4px 15px rgba(196, 162, 101, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(196, 162, 101, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 1.5px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-outline-dark {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-text);
}

.btn-outline-dark:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

/* ----- Navigation ----- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: all var(--transition-base);
}

.nav.scrolled {
  background: rgba(250, 247, 242, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--color-border);
}

@media (prefers-color-scheme: dark) {
  .nav.scrolled {
    background: rgba(17, 17, 17, 0.85);
  }
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  color: var(--color-text);
}

.nav-logo img {
  height: 36px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  position: relative;
  padding: var(--space-1) 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

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

.nav-links a:hover::after {
  width: 100%;
}

.nav-lang {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-base);
  background: transparent;
  font-family: var(--font-zh);
}

.nav-lang:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--space-2);
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition-base);
  border-radius: 2px;
}

/* ----- Hero Section ----- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  overflow: hidden;
}

/* 精致光晕层 — 模拟金箔反光 */
.hero-bg-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 15% 40%, rgba(196, 162, 101, 0.07) 0%, transparent 60%),
    radial-gradient(ellipse 50% 60% at 85% 70%, rgba(196, 162, 101, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse 40% 40% at 50% 10%, rgba(255, 255, 255, 0.03) 0%, transparent 40%);
  pointer-events: none;
}

/* 装饰性斜线纹理（极淡） */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 40px,
    rgba(196, 162, 101, 0.015) 40px,
    rgba(196, 162, 101, 0.015) 41px
  );
  pointer-events: none;
  z-index: 0;
}

.hero::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 200px;
  background: linear-gradient(to top, var(--color-bg), transparent);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: var(--space-6);
  margin: 0 auto;
  text-align: center;
}

.hero-tag {
  display: inline-block;
  padding: 7px 22px;
  border: 1px solid rgba(196, 162, 101, 0.25);
  border-radius: var(--radius-full);
  font-family: var(--font-en);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--color-accent);
  margin-bottom: var(--space-8);
  letter-spacing: 3px;
  text-transform: uppercase;
  backdrop-filter: blur(10px);
  background: rgba(196, 162, 101, 0.06);
}

.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-6xl);
  font-weight: var(--weight-bold);
  color: var(--color-white);
  line-height: 1.08;
  margin-bottom: var(--space-6);
  letter-spacing: -0.03em;
  font-style: normal;
}

.hero-subtitle {
  font-family: var(--font-zh);
  font-size: var(--text-xl);
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.8;
  margin-bottom: var(--space-10);
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
}

/* 统计区 — 金色上边线 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
  margin-top: var(--space-20);
  padding-top: var(--space-12);
  border-top: 1px solid rgba(196, 162, 101, 0.15);
  position: relative;
}

.hero-stats::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
}

.hero-stat {
  text-align: center;
}

.hero-stat-number {
  font-family: var(--font-display);
  font-size: var(--text-5xl);
  font-weight: var(--weight-bold);
  color: var(--color-accent);
  margin-bottom: var(--space-1);
  line-height: 1.1;
}

.hero-stat-label {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 1px;
  font-family: var(--font-en);
  text-transform: uppercase;
}

/* ----- Sections ----- */
.section {
  padding: var(--space-32) 0;
}

.section-alt {
  background: var(--color-bg-alt);
  position: relative;
}

.section-alt::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0.2;
}

.section-alt::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0.2;
}

/* ----- Advantages Section ----- */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-16);
}

.advantage-card {
  background: var(--gradient-card);
  border-radius: var(--radius-lg);
  padding: var(--space-12) var(--space-8);
  text-align: center;
  border: 1px solid var(--color-border);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.advantage-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.advantage-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 48px rgba(13, 43, 29, 0.1);
  border-color: rgba(196, 162, 101, 0.3);
}

.advantage-card:hover::before {
  opacity: 1;
}

.advantage-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-6);
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.advantage-card:hover .advantage-icon {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  color: var(--color-white);
  transform: scale(1.05) translateY(-2px);
  box-shadow: 0 8px 24px rgba(196, 162, 101, 0.25);
}

.advantage-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  margin-bottom: var(--space-3);
}

.advantage-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 260px;
  margin: 0 auto;
}

/* ----- Products Preview ----- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
  margin-top: var(--space-12);
}

.product-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
}

.product-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(196, 162, 101, 0);
  transition: border-color 0.4s ease;
  pointer-events: none;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 60px rgba(13, 43, 29, 0.12);
}

.product-card:hover::after {
  border-color: rgba(196, 162, 101, 0.25);
}

.product-card-image {
  width: 100%;
  height: 280px;
  object-fit: cover;
  transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.product-card:hover .product-card-image {
  transform: scale(1.06);
}

.product-card-body {
  padding: var(--space-8);
}

.product-card-tag {
  display: inline-block;
  font-family: var(--font-en);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: 2.5px;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.product-card-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: var(--weight-semibold);
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

.product-card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-6);
}

.product-card-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-en);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-accent);
  transition: all var(--transition-base);
}

.product-card-link svg {
  transition: transform var(--transition-base);
}

.product-card:hover .product-card-link {
  gap: var(--space-3);
}

.product-card:hover .product-card-link svg {
  transform: translateX(4px);
}

.product-card:hover .product-card-image {
  transform: scale(1.06);
}

/* ----- CTA Section ----- */
.cta-section {
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 45% 50% at 50% 40%, rgba(196, 162, 101, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(255, 255, 255, 0.02) 0%, transparent 50%);
}

.cta-section::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 50px,
    rgba(196, 162, 101, 0.012) 50px,
    rgba(196, 162, 101, 0.012) 51px
  );
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-20) 0;
}

.cta-title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  color: var(--color-white);
  margin-bottom: var(--space-6);
  font-weight: var(--weight-bold);
  letter-spacing: -0.02em;
}

.cta-desc {
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.65);
  max-width: 480px;
  margin: 0 auto var(--space-10);
  line-height: 1.8;
}

/* ----- Footer ----- */
.footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

.footer-brand {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.footer-desc {
  font-size: var(--text-sm);
  line-height: 1.8;
  margin-bottom: var(--space-6);
}

.footer-social {
  display: flex;
  gap: var(--space-4);
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  transition: all var(--transition-base);
}

.footer-social a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(196, 162, 101, 0.1);
}

.footer-heading {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: var(--space-6);
}

.footer-links li {
  margin-bottom: var(--space-3);
}

.footer-links a {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.6);
  transition: all var(--transition-base);
}

.footer-links a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}

.footer-contact-item {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
}

.footer-contact-icon {
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 3px;
}

.footer-bottom {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.4);
}

/* ----- Scroll Animations ----- */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.animate-on-scroll.delay-1 { transition-delay: 0.1s; }
.animate-on-scroll.delay-2 { transition-delay: 0.2s; }
.animate-on-scroll.delay-3 { transition-delay: 0.3s; }
.animate-on-scroll.delay-4 { transition-delay: 0.4s; }

/* Floating particles (decorative) */
.particles {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: rgba(196, 162, 101, 0.3);
  border-radius: 50%;
  animation: float 20s infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  50% { transform: translateY(-100vh) rotate(180deg); }
}

/* ----- Responsive ----- */
@media (max-width: 1024px) {
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-title {
    font-size: var(--text-5xl);
  }
  .products-grid {
    gap: var(--space-6);
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(250, 247, 242, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: var(--space-8);
    gap: var(--space-6);
    box-shadow: var(--shadow-lg);
  }

  .nav-links.open {
    display: flex;
  }

  @media (prefers-color-scheme: dark) {
    .nav-links {
      background: rgba(17, 17, 17, 0.98);
    }
  }

  .nav-toggle {
    display: flex;
  }

  .hero-title {
    font-size: var(--text-4xl);
  }

  .hero-subtitle {
    font-size: var(--text-base);
  }

  .hero-stats {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .section-title {
    font-size: var(--text-3xl);
  }

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

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

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

  .section {
    padding: var(--space-16) 0;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-stat-number {
    font-size: var(--text-3xl);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }

  .cta-title {
    font-size: var(--text-3xl);
  }

  .product-card-image {
    height: 200px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: var(--text-3xl);
  }

  .container {
    padding: 0 var(--space-4);
  }

  .btn {
    padding: 12px 24px;
    font-size: var(--text-sm);
  }
}