:root {
  color-scheme: light;
  --color-primary: #1a1a2e;
  --color-accent: #e8a838;
  --color-accent-hover: #d4952e;
  --color-background: #ffffff;
  --color-surface: #ffffff;
  --color-surface-alt: #f8f9fa;
  --color-text: #333333;
  --color-muted-text: #666666;
  --color-border: #e0e0e0;
  --color-focus: #1a1a2e;
  --font-body: "Source Han Sans SC", "Noto Sans SC", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-display: "Source Han Sans SC", "Noto Sans SC", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --space-unit: 0.5rem;
  --content-width: 72rem;
  --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
  --shadow-hover: 0 8px 24px rgba(0,0,0,0.10);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-body);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100dvh;
  line-height: 1.7;
  font-size: 16px;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.skip-link {
  left: 1rem;
  position: fixed;
  top: 1rem;
  transform: translateY(-200%);
  z-index: 100;
  background: var(--color-primary);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ===== HEADER ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-primary);
  letter-spacing: -0.01em;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-icon svg {
  width: 24px;
  height: 24px;
}

.main-nav {
  display: flex;
  gap: 2rem;
}

.main-nav a {
  font-size: 0.9375rem;
  color: var(--color-muted-text);
  transition: color 0.2s;
  padding: 0.25rem 0;
  position: relative;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-primary);
}

.main-nav a.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--color-primary);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

/* ===== MAIN CONTENT ===== */
main {
  padding-top: 72px;
}

.section {
  padding: 5rem 1.5rem;
}

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

.container {
  max-width: var(--content-width);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 0.75rem;
}

.section-header p {
  color: var(--color-muted-text);
  font-size: 1.0625rem;
  max-width: 36rem;
  margin: 0 auto;
}

.section-label {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #1a1a2e 0%, #2d2d44 50%, #1a1a2e 100%);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 70%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(232,168,56,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 4rem 1.5rem;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.2;
  margin: 0 0 1.5rem;
  letter-spacing: -0.02em;
}

.hero h1 span {
  color: var(--color-accent);
}

.hero-desc {
  font-size: 1.25rem;
  color: rgba(255,255,255,0.75);
  max-width: 32rem;
  margin: 0 0 2.5rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9375rem;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.4);
}

.btn-outline:hover {
  border-color: #fff;
  background: rgba(255,255,255,0.08);
}

/* ===== STATS ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

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

.stat-number {
  font-family: var(--font-display);
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
}

.stat-number span {
  font-size: 1.5rem;
  color: var(--color-accent);
}

.stat-label {
  font-size: 0.9375rem;
  color: var(--color-muted-text);
  margin-top: 0.25rem;
}

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

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: all 0.25s;
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
  border-color: transparent;
}

.card-icon {
  width: 48px;
  height: 48px;
  background: var(--color-surface-alt);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  color: var(--color-accent);
}

.card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0 0 0.75rem;
}

.card p {
  color: var(--color-muted-text);
  font-size: 0.9375rem;
  margin: 0;
  line-height: 1.7;
}

/* ===== CASE CARDS ===== */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.case-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all 0.25s;
}

.case-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
  border-color: transparent;
}

.case-img {
  width: 100%;
  aspect-ratio: 16/10;
  background: var(--color-surface-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-muted-text);
  font-size: 0.875rem;
}

.case-body {
  padding: 1.25rem 1.5rem;
}

.case-body h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0 0 0.5rem;
}

.case-body p {
  font-size: 0.875rem;
  color: var(--color-muted-text);
  margin: 0;
}

.case-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.125rem 0.5rem;
  border-radius: 3px;
  background: rgba(232,168,56,0.1);
  color: var(--color-accent);
  margin-top: 0.75rem;
}

/* ===== TIMELINE ===== */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: 2.5rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 4px;
  width: 16px;
  height: 16px;
  background: var(--color-accent);
  border-radius: 50%;
  border: 3px solid var(--color-background);
  box-shadow: 0 0 0 2px var(--color-accent);
}

.timeline-year {
  font-weight: 700;
  color: var(--color-primary);
  font-size: 1.0625rem;
  margin-bottom: 0.25rem;
}

.timeline-text {
  color: var(--color-muted-text);
  font-size: 0.9375rem;
}

/* ===== FORM ===== */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group.full {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(26,26,46,0.08);
}

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

/* ===== CONTACT INFO ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-item {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
}

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

.contact-label {
  font-size: 0.8125rem;
  color: var(--color-muted-text);
  margin-bottom: 0.125rem;
}

.contact-value {
  font-weight: 500;
  color: var(--color-primary);
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.7);
  padding: 3rem 1.5rem 1.5rem;
}

.footer-inner {
  max-width: var(--content-width);
  margin: 0 auto;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand {
  font-size: 1.125rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.75rem;
}

.footer-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  max-width: 28rem;
}

.footer-col h4 {
  color: #fff;
  font-size: 0.875rem;
  font-weight: 600;
  margin: 0 0 1rem;
  letter-spacing: 0.05em;
}

.footer-col a {
  display: block;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.6);
  padding: 0.25rem 0;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: #fff;
}

.footer-bottom {
  padding-top: 1.5rem;
  font-size: 0.8125rem;
  text-align: center;
  color: rgba(255,255,255,0.4);
}

/* ===== PAGE: ABOUT ===== */
.page-banner {
  background: var(--color-primary);
  padding: 4rem 1.5rem 3rem;
  text-align: center;
}

.page-banner h1 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  color: #fff;
  margin: 0 0 0.75rem;
}

.page-banner p {
  color: rgba(255,255,255,0.7);
  font-size: 1.0625rem;
  max-width: 32rem;
  margin: 0 auto;
}

.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about-img-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-muted-text);
  font-size: 0.875rem;
  border: 1px solid var(--color-border);
}

.about-text h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 1rem;
}

.about-text p {
  color: var(--color-muted-text);
  margin-bottom: 1rem;
}

/* ===== HONOR LIST ===== */
.honor-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.honor-item {
  text-align: center;
  padding: 2rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all 0.25s;
}

.honor-item:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-card);
}

.honor-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.honor-item h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0 0 0.25rem;
}

.honor-item p {
  font-size: 0.8125rem;
  color: var(--color-muted-text);
  margin: 0;
}

/* ===== PRODUCT PAGE ===== */
.product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  padding: 3rem 0;
  border-bottom: 1px solid var(--color-border);
}

.product-detail:last-child {
  border-bottom: none;
}

.product-detail.reverse {
  direction: rtl;
}

.product-detail.reverse > * {
  direction: ltr;
}

.product-img-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-muted-text);
  border: 1px solid var(--color-border);
}

.product-info h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 0.75rem;
}

.product-info p {
  color: var(--color-muted-text);
  margin-bottom: 1rem;
}

.product-features {
  list-style: none;
  padding: 0;
  margin: 0;
}

.product-features li {
  padding: 0.375rem 0;
  color: var(--color-text);
  font-size: 0.9375rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.product-features li::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  flex-shrink: 0;
}

/* ===== PRODUCT DETAIL PAGE ===== */
.product-detail-page {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.product-gallery {
  position: sticky;
  top: 88px;
}

.product-main-img {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-main-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.product-info-panel h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-primary);
  margin: 0 0 0.5rem;
}

.product-subtitle {
  font-size: 1.0625rem;
  color: var(--color-accent);
  font-weight: 500;
  margin: 0 0 1.5rem;
}

.product-desc {
  color: var(--color-muted-text);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.product-scene {
  background: var(--color-surface-alt);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  color: var(--color-text);
  margin-bottom: 2rem;
  border: 1px solid var(--color-border);
}

.product-scene strong {
  color: var(--color-primary);
}

.product-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.specs-section {
  margin-top: 3rem;
  padding-top: 3rem;
  border-top: 1px solid var(--color-border);
}

.specs-section h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 1.5rem;
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
}

.specs-table tr:nth-child(odd) {
  background: var(--color-surface-alt);
}

.specs-table td {
  padding: 0.875rem 1.25rem;
  border: 1px solid var(--color-border);
  font-size: 0.9375rem;
}

.specs-table td:first-child {
  font-weight: 600;
  color: var(--color-primary);
  width: 35%;
}

.product-features-section {
  margin-top: 3rem;
  padding-top: 3rem;
  border-top: 1px solid var(--color-border);
}

.product-features-section h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 1.5rem;
}

/* ===== CTA SECTION ===== */
.cta-section {
  background: var(--color-primary);
  text-align: center;
  padding: 4rem 1.5rem;
}

.cta-section h2 {
  font-size: 2rem;
  color: #fff;
  margin: 0 0 0.75rem;
}

.cta-section p {
  color: rgba(255,255,255,0.7);
  font-size: 1.0625rem;
  margin-bottom: 2rem;
  max-width: 28rem;
  margin-left: auto;
  margin-right: auto;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .card-grid,
  .case-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .honor-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-intro,
  .product-detail,
  .product-detail-page,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .product-detail.reverse {
    direction: ltr;
  }
  .product-gallery {
    position: static;
  }
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.25rem;
  }
  .hero-desc {
    font-size: 1.0625rem;
  }
  .section {
    padding: 3rem 1.25rem;
  }
  .section-header h2 {
    font-size: 1.5rem;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
  .stat-number {
    font-size: 2rem;
  }
  .card-grid,
  .case-grid {
    grid-template-columns: 1fr;
  }
  .form-grid {
    grid-template-columns: 1fr;
  }
  .form-group.full {
    grid-column: 1;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 1rem 1.5rem;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
  }

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

  .main-nav a {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
  }

  .main-nav a:last-child {
    border-bottom: none;
  }

  .nav-toggle {
    display: block;
  }

  .page-banner h1 {
    font-size: 1.75rem;
  }
  .honor-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}