/* =====================================================
   尤米旗袍企业官网 — Global Styles
   Design: 东方雅韵 × 现代简约
   ===================================================== */

/* --- 1. CSS Variables --- */
:root {
  /* Colors */
  --color-primary: #C0392B;
  --color-primary-dark: #A93226;
  --color-primary-light: #E74C3C;
  --color-secondary: #1A1A1A;
  --color-accent: #B8860B;
  --color-accent-light: #DAA520;
  --color-bg: #FAFAF8;
  --color-surface: #F5F0E8;
  --color-surface-dark: #EDE8DF;
  --color-text: #2C2C2C;
  --color-text-secondary: #6B6B6B;
  --color-text-muted: #9B9B9B;
  --color-divider: #E0DCD4;
  --color-white: #FFFFFF;
  --color-black: #000000;

  /* Typography */
  --font-display: 'Noto Serif SC', 'Songti SC', serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-english: 'Cormorant Garamond', 'Times New Roman', serif;

  /* Spacing */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;
  --space-2xl: 96px;
  --space-3xl: 120px;

  /* Layout */
  --max-width: 1280px;
  --header-height: 72px;

  /* Transitions */
  --transition-fast: 200ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 600ms cubic-bezier(0.25, 0.46, 0.45, 0.94);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;
}

/* --- 2. Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* --- 3. Scrollbar --- */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--color-surface);
}
::-webkit-scrollbar-thumb {
  background: var(--color-accent);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* --- 4. Selection --- */
::selection {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* --- 5. Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-secondary);
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
h3 { font-size: clamp(1.3rem, 3vw, 1.8rem); }
h4 { font-size: 1.2rem; }

p {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* --- 6. Layout Utilities --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-3xl) 0;
}

.section--surface {
  background-color: var(--color-surface);
}

.section--dark {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--color-white);
}

.section--dark p {
  color: rgba(255,255,255,0.7);
}

/* --- 7. Section Header --- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-header__eyebrow {
  font-family: var(--font-english);
  font-size: 0.85rem;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
  display: block;
}

.section-header__title {
  margin-bottom: var(--space-sm);
}

.section-header__subtitle {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.section-header--white .section-header__eyebrow {
  color: var(--color-accent-light);
}

.section-header--white .section-header__title {
  color: var(--color-white);
}

.section-header--white .section-header__subtitle {
  color: rgba(255,255,255,0.6);
}

/* Decorative line */
.section-header__line {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  margin: var(--space-sm) auto var(--space-md);
}

/* --- 8. Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 14px 36px;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 1px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  border: 2px solid var(--color-primary);
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(192, 57, 43, 0.3);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn--outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn--outline-white {
  background-color: transparent;
  color: var(--color-white);
  border: 2px solid rgba(255,255,255,0.6);
}

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

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  padding: 10px 20px;
  border: none;
}

.btn--ghost:hover {
  color: var(--color-primary);
}

/* --- 9. Decorative Elements --- */
.decorative-line {
  width: 80px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  margin: var(--space-md) auto;
}

.decorative-pattern {
  position: absolute;
  opacity: 0.04;
  pointer-events: none;
}

/* Corner decorations */
.corner-decoration {
  position: absolute;
  width: 60px;
  height: 60px;
  border-color: var(--color-primary);
  opacity: 0.3;
}

.corner-decoration--tl {
  top: 20px;
  left: 20px;
  border-top: 2px solid;
  border-left: 2px solid;
}

.corner-decoration--br {
  bottom: 20px;
  right: 20px;
  border-bottom: 2px solid;
  border-right: 2px solid;
}

/* --- 10. Header / Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  transition: all var(--transition-base);
}

.header--transparent {
  background: transparent;
}

.header--solid {
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
}

.header__logo-mark {
  width: 42px;
  height: 42px;
}

.header__logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.header__logo-cn {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-secondary);
  letter-spacing: 2px;
}

.header__logo-en {
  font-family: var(--font-english);
  font-size: 0.65rem;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.header--transparent .header__logo-cn {
  color: var(--color-white);
}

.header--transparent .header__logo-en {
  color: rgba(255,255,255,0.7);
}

/* Nav Links */
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__link {
  position: relative;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 1px;
  color: var(--color-text-secondary);
  padding: 8px 0;
  transition: color var(--transition-fast);
}

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

.nav__link:hover,
.nav__link--active {
  color: var(--color-primary);
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

.header--transparent .nav__link {
  color: rgba(255,255,255,0.8);
}

.header--transparent .nav__link:hover,
.header--transparent .nav__link--active {
  color: var(--color-white);
}

.header--transparent .nav__link::after {
  background: var(--color-white);
}

.header__cta {
  padding: 10px 24px;
  font-size: 0.85rem;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
  z-index: 1001;
}

.menu-toggle__bar {
  width: 24px;
  height: 2px;
  background: var(--color-secondary);
  transition: all var(--transition-base);
  transform-origin: center;
}

.header--transparent .menu-toggle__bar {
  background: var(--color-white);
}

.menu-toggle.active .menu-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active .menu-toggle__bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.menu-toggle.active .menu-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Navigation */
.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(26, 26, 26, 0.97);
  backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.mobile-nav.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav__link {
  font-family: var(--font-display);
  font-size: 2rem;
  color: rgba(255,255,255,0.7);
  transition: all var(--transition-fast);
  transform: translateY(20px);
  opacity: 0;
}

.mobile-nav.active .mobile-nav__link {
  transform: translateY(0);
  opacity: 1;
}

.mobile-nav.active .mobile-nav__link:nth-child(1) { transition-delay: 100ms; }
.mobile-nav.active .mobile-nav__link:nth-child(2) { transition-delay: 150ms; }
.mobile-nav.active .mobile-nav__link:nth-child(3) { transition-delay: 200ms; }
.mobile-nav.active .mobile-nav__link:nth-child(4) { transition-delay: 250ms; }
.mobile-nav.active .mobile-nav__link:nth-child(5) { transition-delay: 300ms; }

.mobile-nav__link:hover,
.mobile-nav__link--active {
  color: var(--color-white);
  text-shadow: 0 0 30px rgba(192, 57, 43, 0.5);
}

/* --- 11. Hero Section --- */
.hero {
  position: relative;
  height: 100vh;
  min-height: 700px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background-image: url('https://images.unsplash.com/photo-1558618666-fcd25c85cd64?w=1920&q=80');
  background-size: cover;
  background-position: center;
  transform: scale(1.05);
  animation: heroZoom 20s ease-in-out infinite alternate;
}

@keyframes heroZoom {
  from { transform: scale(1.05); }
  to { transform: scale(1.12); }
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(26, 26, 26, 0.7) 0%,
    rgba(26, 26, 26, 0.4) 50%,
    rgba(192, 57, 43, 0.2) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  padding: 0 var(--space-md);
}

.hero__eyebrow {
  font-family: var(--font-english);
  font-size: 1rem;
  letter-spacing: 6px;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin-bottom: var(--space-sm);
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease-out 0.3s forwards;
}

.hero__title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.2;
  margin-bottom: var(--space-sm);
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease-out 0.5s forwards;
}

.hero__title em {
  font-style: normal;
  color: var(--color-primary-light);
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: rgba(255,255,255,0.8);
  margin-bottom: var(--space-lg);
  line-height: 1.8;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease-out 0.7s forwards;
}

.hero__actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease-out 0.9s forwards;
}

.hero__scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: rgba(255,255,255,0.5);
  font-size: 0.75rem;
  letter-spacing: 2px;
  opacity: 0;
  animation: fadeIn 1s ease-out 1.2s forwards;
}

.hero__scroll-arrow {
  width: 24px;
  height: 40px;
  border: 1.5px solid rgba(255,255,255,0.3);
  border-radius: 12px;
  position: relative;
}

.hero__scroll-arrow::after {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 8px;
  background: rgba(255,255,255,0.6);
  border-radius: 2px;
  animation: scrollBounce 1.5s ease-in-out infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
  50% { transform: translateX(-50%) translateY(10px); opacity: 0.3; }
}

/* --- 12. Brand Story --- */
.story {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.story__image-wrap {
  position: relative;
}

.story__image {
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
}

.story__image-accent {
  position: absolute;
  bottom: -20px;
  right: -20px;
  width: 200px;
  height: 200px;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  z-index: -1;
  opacity: 0.3;
}

.story__content {
  padding: var(--space-lg) 0;
}

.story__eyebrow {
  font-family: var(--font-english);
  font-size: 0.8rem;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.story__title {
  margin-bottom: var(--space-md);
}

.story__divider {
  width: 50px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  margin-bottom: var(--space-md);
}

.story__text {
  margin-bottom: var(--space-sm);
}

.story__features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.story__feature {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.9rem;
  color: var(--color-text);
}

.story__feature-icon {
  color: var(--color-primary);
  flex-shrink: 0;
}

/* --- 13. Products Grid --- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.product-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  cursor: pointer;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.product-card__image-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 3/4;
}

.product-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.product-card:hover .product-card__image {
  transform: scale(1.08);
}

.product-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(26,26,26,0.7) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-base);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: var(--space-md);
}

.product-card:hover .product-card__overlay {
  opacity: 1;
}

.product-card__badge {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  letter-spacing: 1px;
}

.product-card__info {
  padding: var(--space-md);
}

.product-card__category {
  font-size: 0.75rem;
  color: var(--color-primary);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.product-card__name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.product-card__desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Product Filter Tabs */
.product-filters {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.product-filter {
  padding: 8px 24px;
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  background: transparent;
}

.product-filter:hover,
.product-filter.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

/* --- 14. Stats Section --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.stat-item {
  text-align: center;
  padding: var(--space-lg) var(--space-md);
  position: relative;
}

.stat-item::after {
  content: '';
  position: absolute;
  right: 0;
  top: 30%;
  height: 40%;
  width: 1px;
  background: rgba(255,255,255,0.15);
}

.stat-item:last-child::after {
  display: none;
}

.stat-item__icon {
  color: var(--color-accent-light);
  margin-bottom: var(--space-sm);
  display: flex;
  justify-content: center;
}

.stat-item__number {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1;
  margin-bottom: 4px;
}

.stat-item__number .suffix {
  font-size: 1.5rem;
  color: var(--color-accent-light);
}

.stat-item__label {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  letter-spacing: 1px;
}

/* --- 15. Factory/Facilities --- */
.facilities-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.facility-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  aspect-ratio: 16/9;
  cursor: pointer;
  group: true;
}

.facility-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s ease;
}

.facility-card:hover .facility-card__image {
  transform: scale(1.05);
}

.facility-card__info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-lg);
  background: linear-gradient(to top, rgba(26,26,26,0.9), transparent);
  color: var(--color-white);
  transform: translateY(20px);
  transition: transform var(--transition-base);
}

.facility-card:hover .facility-card__info {
  transform: translateY(0);
}

.facility-card__icon {
  margin-bottom: var(--space-xs);
  color: var(--color-accent-light);
}

.facility-card__name {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-bottom: 4px;
}

.facility-card__desc {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
}

/* --- 16. Team Section --- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

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

.team-card__image {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto var(--space-sm);
  border: 3px solid var(--color-divider);
  transition: all var(--transition-base);
  filter: grayscale(20%);
}

.team-card:hover .team-card__image {
  border-color: var(--color-primary);
  transform: scale(1.03);
  filter: grayscale(0%);
}

.team-card__name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin-bottom: 4px;
}

.team-card__role {
  font-size: 0.85rem;
  color: var(--color-primary);
  letter-spacing: 1px;
}

/* --- 17. Honors / Certificates --- */
.honors-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.honor-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  border: 1px solid var(--color-divider);
  position: relative;
  overflow: hidden;
}

.honor-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.honor-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.honor-card:hover::before {
  transform: scaleX(1);
}

.honor-card__icon {
  width: 60px;
  height: 60px;
  margin: 0 auto var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-primary);
}

.honor-card__name {
  font-family: var(--font-display);
  font-size: 1rem;
  margin-bottom: var(--space-xs);
  line-height: 1.4;
}

.honor-card__org {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.honor-card__date {
  font-size: 0.75rem;
  color: var(--color-accent);
  margin-top: var(--space-xs);
  letter-spacing: 1px;
}

/* --- 18. Timeline (About page) --- */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--color-divider);
  transform: translateX(-50%);
}

.timeline__item {
  display: flex;
  align-items: flex-start;
  margin-bottom: var(--space-xl);
  position: relative;
}

.timeline__item:nth-child(odd) {
  flex-direction: row;
}

.timeline__item:nth-child(even) {
  flex-direction: row-reverse;
}

.timeline__dot {
  position: absolute;
  left: 50%;
  top: 20px;
  transform: translateX(-50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-primary);
  z-index: 1;
}

.timeline__content {
  width: calc(50% - 40px);
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-divider);
}

.timeline__year {
  font-family: var(--font-english);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.timeline__title {
  font-family: var(--font-display);
  font-size: 1rem;
  margin-bottom: var(--space-xs);
}

.timeline__desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* --- 19. Contact Section --- */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.contact-info__title {
  margin-bottom: var(--space-lg);
}

.contact-info__items {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact-info__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

.contact-info__icon {
  width: 44px;
  height: 44px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.contact-info__label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 2px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.contact-info__value {
  font-size: 0.95rem;
  color: var(--color-text);
  font-weight: 500;
}

.contact-info__value a:hover {
  color: var(--color-primary);
}

.contact-info__social {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.social-link {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  border: 1px solid var(--color-divider);
}

.social-link:hover {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

/* --- 20. Contact Form --- */
.contact-form {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-divider);
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
  letter-spacing: 1px;
}

.form-label .required {
  color: var(--color-primary);
  margin-left: 2px;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-bg);
  transition: all var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(192, 57, 43, 0.1);
  background: var(--color-white);
}

.form-input.error,
.form-textarea.error {
  border-color: var(--color-primary);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-error {
  font-size: 0.8rem;
  color: var(--color-primary);
  margin-top: 4px;
  display: none;
}

.form-error.visible {
  display: block;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.form-success {
  text-align: center;
  padding: var(--space-xl);
  display: none;
}

.form-success.visible {
  display: block;
}

.form-success__icon {
  width: 64px;
  height: 64px;
  background: rgba(39, 174, 96, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-sm);
  color: #27ae60;
}

.form-success__title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-bottom: var(--space-xs);
}

.form-success__desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

/* --- 21. CTA Section --- */
.cta-section {
  position: relative;
  text-align: center;
  overflow: hidden;
}

.cta-section__bg {
  position: absolute;
  inset: 0;
  background-image: url('https://images.unsplash.com/photo-1507679799987-c73779587ccf?w=1920&q=80');
  background-size: cover;
  background-position: center;
  filter: brightness(0.3);
}

.cta-section__content {
  position: relative;
  z-index: 1;
}

.cta-section__title {
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.cta-section__subtitle {
  color: rgba(255,255,255,0.7);
  font-size: 1.1rem;
  margin-bottom: var(--space-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* --- 22. Footer --- */
.footer {
  background: var(--color-secondary);
  color: rgba(255,255,255,0.6);
  padding: var(--space-3xl) 0 var(--space-lg);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-3xl);
}

.footer__brand {
  max-width: 320px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.footer__logo-cn {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 2px;
}

.footer__logo-en {
  font-family: var(--font-english);
  font-size: 0.65rem;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
}

.footer__desc {
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.footer__col-title {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--color-white);
  margin-bottom: var(--space-md);
  letter-spacing: 1px;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer__link {
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-white);
  padding-left: 8px;
}

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.footer__bottom a {
  color: rgba(255,255,255,0.5);
  transition: color var(--transition-fast);
}

.footer__bottom a:hover {
  color: var(--color-white);
}

/* --- 23. Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Scroll reveal states */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reveal-left.revealed {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reveal-right.revealed {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.9);
  transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reveal-scale.revealed {
  opacity: 1;
  transform: scale(1);
}

/* --- 24. Breadcrumb --- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

.breadcrumb__sep {
  color: var(--color-divider);
}

/* --- 25. Page Hero (inner pages) --- */
.page-hero {
  position: relative;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.page-hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}

.page-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,26,26,0.75), rgba(192,57,43,0.3));
}

.page-hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--color-white);
}

.page-hero__title {
  font-size: clamp(2rem, 5vw, 3rem);
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.page-hero__subtitle {
  font-size: 1rem;
  color: rgba(255,255,255,0.7);
  max-width: 500px;
  margin: 0 auto;
}

/* --- 26. Responsive --- */
@media (max-width: 1024px) {
  .nav {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .mobile-nav {
    display: flex;
  }

  .story {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .story__image-wrap {
    order: -1;
  }

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

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

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

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

  .contact-wrapper {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }

  .timeline::before {
    left: 20px;
  }

  .timeline__item,
  .timeline__item:nth-child(even) {
    flex-direction: row;
    padding-left: 50px;
  }

  .timeline__dot {
    left: 20px;
  }

  .timeline__content {
    width: 100%;
  }
}

@media (max-width: 768px) {
  :root {
    --space-3xl: 80px;
    --space-2xl: 60px;
  }

  .products-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

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

  .stat-item::after {
    display: none;
  }

  .stat-item__number {
    font-size: 2.2rem;
  }

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

  .team-card__image {
    width: 120px;
    height: 120px;
  }

  .honors-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

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

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

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

  .page-hero {
    height: 320px;
  }
}

/* --- 27. Utility Classes --- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent); }
.text-white { color: var(--color-white); }
.text-muted { color: var(--color-text-muted); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.hidden { display: none; }

@media (max-width: 768px) {
  .hidden-mobile { display: none; }
}

@media (min-width: 769px) {
  .hidden-desktop { display: none; }
}