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

:root {
  --color-primary-dark: #0d3b2e;
  --color-accent-gold: #c9a84c;
  --color-accent-orange: #e67e22;
  --color-surface-light: #f5f2e8;
  --color-text-primary: #ffffff;
  --color-text-secondary: #b8b5a8;
  --color-glass-overlay: rgba(13, 59, 46, 0.7);
  --color-divider: #c9a84c;
  --font-heading: Impact, 'Arial Black', sans-serif;
  --font-body: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --container-max: 1280px;
  --header-height: 72px;
  --transition-default: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.25);
  --radius-sm: 4px;
  --radius-md: 8px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-primary-dark);
  color: var(--color-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

:focus-visible {
  outline: 2px solid var(--color-accent-gold);
  outline-offset: 2px;
}

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

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 10000;
  padding: 0.75rem 1.5rem;
  background: var(--color-accent-gold);
  color: var(--color-primary-dark);
  font-weight: 700;
  font-size: 0.875rem;
  text-decoration: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
}

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-primary-dark);
  border-bottom: 2px solid rgba(201, 168, 76, 0.2);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
}

.brand {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--color-text-primary);
  line-height: 1.1;
}

.brand-link:hover .brand-name {
  color: var(--color-accent-gold);
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.625rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  transition: color var(--transition-default);
}

.brand-accent {
  color: var(--color-accent-gold);
}

.brand-tagline {
  font-size: 0.7rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-top: 0.1rem;
}

/* ===== NAVIGATION ===== */
.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 0.25rem;
}

.nav-list a {
  display: block;
  padding: 0.5rem 1rem;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-default), border-color var(--transition-default);
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.nav-list a:hover {
  color: var(--color-accent-gold);
  border-bottom-color: var(--color-accent-gold);
}

.nav-list a[aria-current="page"] {
  color: var(--color-accent-gold);
  border-bottom-color: var(--color-accent-gold);
  font-weight: 700;
}

/* ===== NAV TOGGLE (Mobile) ===== */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 2px solid var(--color-accent-gold);
  border-radius: var(--radius-sm);
  cursor: pointer;
  gap: 5px;
  padding: 8px;
  transition: border-color var(--transition-default);
}

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

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-accent-gold);
  transition: transform var(--transition-default), opacity var(--transition-default);
  border-radius: 1px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== PROGRESS BAR ===== */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-gold), var(--color-accent-orange));
  transition: width 0.15s ease-out;
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .progress-bar {
    transition: none;
  }
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--color-primary-dark);
  border-top: 2px solid rgba(201, 168, 76, 0.15);
  padding: 3rem 1.5rem 1.5rem;
  margin-top: 4rem;
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-text-primary);
  letter-spacing: 0.02em;
}

.footer-tagline {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  padding: 1rem 0;
  border-top: 1px solid rgba(201, 168, 76, 0.2);
  border-bottom: 1px solid rgba(201, 168, 76, 0.2);
}

.footer-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition-default);
}

.footer-links a:hover {
  color: var(--color-accent-gold);
}

.footer-link-sep {
  color: var(--color-accent-gold);
  font-weight: 700;
  font-size: 0.875rem;
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.footer-contact-sep {
  color: var(--color-accent-gold);
  font-weight: 300;
  display: inline;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(201, 168, 76, 0.15);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.footer-copyright {
  letter-spacing: 0.02em;
}

.footer-icp {
  letter-spacing: 0.04em;
  font-weight: 500;
  color: rgba(184, 181, 168, 0.7);
}

/* ===== COMMON COMPONENTS ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* Grid */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-2 {
  grid-template-columns: 1fr 1fr;
}

.grid-3 {
  grid-template-columns: 1fr 1fr 1fr;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 2rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-default);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1.2;
}

.btn-primary {
  background: var(--color-accent-orange);
  color: var(--color-text-primary);
  border-color: var(--color-accent-orange);
}

.btn-primary:hover {
  background: transparent;
  color: var(--color-accent-orange);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent-gold);
  border-color: var(--color-accent-gold);
}

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

/* Breadcrumb */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  list-style: none;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb li + li::before {
  content: ">";
  color: var(--color-accent-gold);
  font-weight: 700;
}

.breadcrumb a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-default);
}

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

.breadcrumb [aria-current="page"] {
  color: var(--color-accent-gold);
  font-weight: 600;
}

/* Section Numbered */
.section-numbered {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}

.section-numbered .num {
  font-family: var(--font-heading);
  font-size: 4rem;
  font-weight: 900;
  line-height: 0.9;
  color: var(--color-accent-gold);
  opacity: 0.5;
  flex-shrink: 0;
  min-width: 1.6em;
}

.section-numbered .title {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.15;
  margin-bottom: 0.5rem;
}

.section-numbered .content {
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 65ch;
}

/* Glass Panel */
.glass-panel {
  background: var(--color-glass-overlay);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(201, 168, 76, 0.15);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-default), box-shadow var(--transition-default);
}

.glass-panel:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

/* Card Stack */
.card-stack {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.card-stack > * {
  position: relative;
  margin-bottom: -1.5rem;
  z-index: 1;
}

.card-stack > *:nth-child(2) {
  margin-left: 1.5rem;
  z-index: 2;
}

.card-stack > *:nth-child(3) {
  margin-left: 3rem;
  z-index: 3;
}

.card-stack > *:last-child {
  margin-bottom: 0;
}

/* Diagonal Split */
.diagonal-split {
  position: relative;
  overflow: hidden;
}

.diagonal-split::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary-dark) 45%, transparent 45%);
  pointer-events: none;
  z-index: 0;
}

.diagonal-split > * {
  position: relative;
  z-index: 1;
}

/* Image Container Base */
.img-container {
  position: relative;
  overflow: hidden;
  background: rgba(201, 168, 76, 0.08);
  border-radius: var(--radius-sm);
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
}

.img-container::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(201, 168, 76, 0.1);
  border-radius: inherit;
  pointer-events: none;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }
  
  .section-numbered .num {
    font-size: 3rem;
  }
  
  .card-stack > *:nth-child(2) {
    margin-left: 1rem;
  }
  .card-stack > *:nth-child(3) {
    margin-left: 2rem;
  }
}

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

  .header-inner {
    padding: 0 1rem;
  }

  .brand-name {
    font-size: 1.375rem;
  }

  .brand-tagline {
    font-size: 0.625rem;
  }

  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: var(--color-primary-dark);
    border-bottom: 2px solid var(--color-accent-gold);
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.3s ease;
  }

  .main-nav[data-open] {
    max-height: 400px;
    padding: 1rem 1.5rem 1.5rem;
  }

  .nav-list {
    flex-direction: column;
    gap: 0.125rem;
  }

  .nav-list a {
    padding: 0.75rem 0.75rem;
    font-size: 0.9375rem;
    border-bottom: none;
    border-left: 3px solid transparent;
  }

  .nav-list a:hover {
    border-left-color: var(--color-accent-gold);
    border-bottom-color: transparent;
  }

  .nav-list a[aria-current="page"] {
    border-left-color: var(--color-accent-gold);
    border-bottom-color: transparent;
    background: rgba(201, 168, 76, 0.08);
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .section-numbered {
    flex-direction: column;
    gap: 0.75rem;
  }

  .section-numbered .num {
    font-size: 2.5rem;
  }

  .section-numbered .title {
    font-size: 1.375rem;
  }

  .glass-panel {
    padding: 1.25rem;
  }

  .card-stack > * {
    margin-bottom: -1rem;
  }
  .card-stack > *:nth-child(2) {
    margin-left: 0.75rem;
  }
  .card-stack > *:nth-child(3) {
    margin-left: 1.5rem;
  }

  .footer-contact {
    flex-direction: column;
    gap: 0.25rem;
  }

  .footer-contact-sep {
    display: none;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .footer-links {
    justify-content: center;
  }

  .diagonal-split::before {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary-dark) 55%, transparent 55%);
  }
}

@media (max-width: 480px) {
  .brand-name {
    font-size: 1.125rem;
  }

  .btn {
    padding: 0.6rem 1.25rem;
    font-size: 0.8125rem;
  }

  .section-numbered .num {
    font-size: 2rem;
  }
}

/* ===== UTILITY ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-gold {
  color: var(--color-accent-gold);
}

.text-orange {
  color: var(--color-accent-orange);
}

.text-secondary {
  color: var(--color-text-secondary);
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }