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

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

body {
  min-height: 100vh;
  line-height: 1.6;
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--color-cream);
  color: var(--color-dark);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg, video {
  display: block;
  max-width: 100%;
}

ul, ol {
  list-style: none;
}

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

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

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

/* === CSS VARIABLES === */
:root {
  --color-primary: #0a1f3f;
  --color-gold: #e6b800;
  --color-green: #00cc66;
  --color-orange: #ff6600;
  --color-cream: #f5f0e1;
  --color-dark: #2b1d1d;
  --color-red: #e64539;
  --color-gray: #d9d9d9;
  --color-primary-light: #132d5e;
  --color-gold-light: #f5d742;
  --color-green-light: #33e085;

  --font-heading: 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-data: 'Courier New', Courier, monospace;

  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 48px;
  --spacing-2xl: 64px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 3px rgba(10, 31, 63, 0.12);
  --shadow-md: 0 4px 12px rgba(10, 31, 63, 0.15);
  --shadow-lg: 0 8px 28px rgba(10, 31, 63, 0.2);

  --transition-fast: 0.2s ease;
  --transition-base: 0.35s ease;
  --transition-slow: 0.5s ease;

  --brand-rail-width: 80px;
  --top-bar-height: 32px;
  --nav-height: 56px;
  --header-height: calc(var(--top-bar-height) + var(--nav-height));
  --max-width: 1280px;
}

/* === SKIP LINK === */
.skip-link {
  position: fixed;
  top: -100%;
  left: var(--spacing-md);
  z-index: 10000;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-primary);
  color: var(--color-cream);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: var(--spacing-sm);
}

/* === SCROLL PROGRESS === */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-orange));
  transition: width 0.1s linear;
  pointer-events: none;
}
@media (prefers-reduced-motion: reduce) {
  .scroll-progress {
    display: none;
  }
}

/* === HEADER === */
.site-header {
  display: grid;
  grid-template-columns: var(--brand-rail-width) 1fr;
  position: relative;
  z-index: 1000;
  background: var(--color-primary);
  box-shadow: 0 2px 12px rgba(10, 31, 63, 0.3);
}

/* Brand Rail */
.brand-rail {
  background: linear-gradient(180deg, #071430 0%, #0a1f3f 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--header-height);
  border-right: 1px solid rgba(230, 184, 0, 0.15);
}
.brand-rail-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) 0;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}
.brand-logo-icon {
  transform: rotate(180deg);
  flex-shrink: 0;
}
.brand-rail-text {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  font-style: italic;
  color: var(--color-gold);
  letter-spacing: 0.15em;
  white-space: nowrap;
}

/* Header Right */
.header-right {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* Top Bar */
.top-bar {
  height: var(--top-bar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-lg);
  background: var(--color-cream);
  border-bottom: 1px solid rgba(10, 31, 63, 0.06);
}
.top-bar-slogan {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-primary);
  letter-spacing: 0.08em;
}
.top-bar-email {
  font-size: 0.7rem;
  color: var(--color-primary-light);
  transition: color var(--transition-fast);
}
.top-bar-email:hover {
  color: var(--color-gold);
}

/* Nav Wrapper */
.nav-wrapper {
  display: flex;
  align-items: center;
  height: var(--nav-height);
  padding: 0 var(--spacing-lg) 0 0;
  background: var(--color-primary);
}

.main-nav {
  flex: 1;
  min-width: 0;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  height: 100%;
}
.nav-list li a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  font-style: italic;
  color: rgba(245, 240, 225, 0.85);
  letter-spacing: 0.04em;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
  position: relative;
}
.nav-list li a:hover {
  color: var(--color-gold);
  background: rgba(230, 184, 0, 0.08);
}
.nav-list li a[aria-current="page"] {
  color: var(--color-gold);
  background: rgba(230, 184, 0, 0.12);
}
.nav-list li a[aria-current="page"]::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 2px;
  background: var(--color-gold);
  border-radius: 1px;
}

/* Bird Mascot */
.bird-mascot {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-left: var(--spacing-sm);
  cursor: default;
  transition: transform var(--transition-base);
}
.bird-mascot:hover {
  transform: scale(1.05);
}
.bird-mascot svg {
  display: block;
}
.eye-glow {
  transition: fill var(--transition-base), filter var(--transition-base);
  fill: url(#eye-glow);
}
.bird-mascot:hover .eye-glow {
  filter: drop-shadow(0 0 8px rgba(230, 184, 0, 0.8));
  fill: #fff8cc;
}

/* Nav Toggle (mobile) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 5px;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
  flex-shrink: 0;
}
.nav-toggle:hover {
  background: rgba(230, 184, 0, 0.1);
}
.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-gold);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}
.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);
}

/* === FOOTER === */
.site-footer {
  background: var(--color-primary);
  color: rgba(245, 240, 225, 0.85);
  padding: var(--spacing-xl) 0 0;
  margin-top: var(--spacing-2xl);
  border-top: 3px solid var(--color-gold);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
}
.footer-brand-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}
.footer-brand-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  font-style: italic;
  color: var(--color-gold);
}
.footer-trust {
  font-size: 0.85rem;
  line-height: 1.5;
  color: rgba(245, 240, 225, 0.7);
  max-width: 320px;
}
.footer-heading {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  font-style: italic;
  color: var(--color-gold);
  margin-bottom: var(--spacing-md);
  letter-spacing: 0.06em;
}
.footer-contact-list li {
  font-size: 0.85rem;
  padding: var(--spacing-xs) 0;
  color: rgba(245, 240, 225, 0.75);
}
.footer-contact-list a {
  color: var(--color-gold-light);
  transition: color var(--transition-fast);
}
.footer-contact-list a:hover {
  color: var(--color-gold);
  text-decoration: underline;
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}
.footer-links li a {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.85rem;
  color: rgba(245, 240, 225, 0.75);
  transition: color var(--transition-fast);
  position: relative;
}
.footer-links li a::before {
  content: '';
  width: 4px;
  height: 4px;
  background: var(--color-gold);
  border-radius: 50%;
  flex-shrink: 0;
}
.footer-links li a:hover {
  color: var(--color-gold);
}
.footer-bottom {
  border-top: 1px solid rgba(230, 184, 0, 0.15);
  padding: var(--spacing-md) 0;
  text-align: center;
}
.footer-bottom .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
}
.footer-icp {
  font-size: 0.75rem;
  color: rgba(245, 240, 225, 0.5);
}
.footer-copy {
  font-size: 0.7rem;
  color: rgba(245, 240, 225, 0.4);
}

/* === CONTAINER === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* === COMMON BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 10px 24px;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  font-style: italic;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  cursor: pointer;
  border: none;
}
.btn:active {
  transform: scale(0.97);
}
.btn-gold {
  background: var(--color-gold);
  color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(230, 184, 0, 0.3);
}
.btn-gold:hover {
  background: var(--color-gold-light);
  box-shadow: 0 4px 16px rgba(230, 184, 0, 0.4);
}
.btn-orange {
  background: var(--color-orange);
  color: #fff;
  box-shadow: 0 2px 8px rgba(255, 102, 0, 0.3);
}
.btn-orange:hover {
  background: #ff8533;
  box-shadow: 0 4px 16px rgba(255, 102, 0, 0.4);
}
.btn-outline {
  background: transparent;
  color: var(--color-gold);
  border: 1.5px solid var(--color-gold);
}
.btn-outline:hover {
  background: rgba(230, 184, 0, 0.1);
}

/* === BADGE === */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 2px 10px;
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.badge-green {
  background: rgba(0, 204, 102, 0.15);
  color: var(--color-green);
}
.badge-green::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-green);
  border-radius: 50%;
}
.badge-red {
  background: rgba(230, 69, 57, 0.15);
  color: var(--color-red);
}
.badge-red::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-red);
  border-radius: 50%;
}

/* === DATA VALUE === */
.data-value {
  font-family: var(--font-data);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: 0.02em;
  background: rgba(10, 31, 63, 0.05);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

/* === CARD === */
.card {
  background: var(--color-cream);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}
.card-float {
  box-shadow: var(--shadow-md);
}
.card-float:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* === SECTION === */
.section {
  padding: var(--spacing-xl) 0;
}
.section-divider {
  height: 4px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-orange), var(--color-gold));
  opacity: 0.3;
  margin: var(--spacing-xl) 0;
}

/* === REVEAL ANIMATION === */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .card-float:hover {
    transform: none;
  }
}

/* === RESPONSIVE === */
@media (max-width: 1023px) {
  :root {
    --brand-rail-width: 56px;
    --top-bar-height: 28px;
    --nav-height: 50px;
  }
  .brand-rail-text {
    font-size: 0.7rem;
  }
  .nav-list li a {
    font-size: 0.8rem;
    padding: var(--spacing-xs) var(--spacing-sm);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
  }
}

@media (max-width: 767px) {
  :root {
    --brand-rail-width: 48px;
    --top-bar-height: 24px;
    --nav-height: 48px;
  }
  .site-header {
    grid-template-columns: 48px 1fr;
  }
  .brand-rail-text {
    font-size: 0.6rem;
  }
  .top-bar {
    padding: 0 var(--spacing-sm);
  }
  .top-bar-slogan {
    font-size: 0.65rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .top-bar-email {
    font-size: 0.6rem;
    white-space: nowrap;
  }
  .nav-wrapper {
    padding: 0 var(--spacing-sm) 0 0;
  }
  .nav-list {
    gap: 2px;
  }
  .nav-list li a {
    font-size: 0.7rem;
    padding: var(--spacing-xs) 8px;
  }
  .bird-mascot {
    width: 36px;
    height: 36px;
    margin-left: 2px;
  }
  .bird-mascot svg {
    width: 32px;
    height: 32px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    text-align: center;
  }
  .footer-brand-row {
    justify-content: center;
  }
  .footer-trust {
    max-width: 100%;
  }
  .footer-links {
    align-items: center;
  }
  .footer-contact-list {
    text-align: center;
  }
}

@media (max-width: 599px) {
  .site-header {
    grid-template-columns: 1fr;
  }
  .brand-rail {
    display: none;
  }
  .header-right {
    width: 100%;
  }
  .top-bar {
    height: 28px;
    padding: 0 var(--spacing-sm);
    justify-content: center;
    gap: var(--spacing-sm);
  }
  .top-bar-slogan {
    font-size: 0.6rem;
  }
  .top-bar-email {
    font-size: 0.55rem;
  }
  .nav-wrapper {
    padding: 0 var(--spacing-sm);
    height: auto;
    flex-wrap: wrap;
  }
  .main-nav {
    order: 2;
    flex: 0 0 100%;
    display: none;
    padding-bottom: var(--spacing-sm);
  }
  .main-nav[data-open] {
    display: block;
  }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav-list li a {
    padding: 10px var(--spacing-sm);
    border-radius: 0;
    border-bottom: 1px solid rgba(230, 184, 0, 0.08);
  }
  .nav-list li a[aria-current="page"]::after {
    display: none;
  }
  .nav-list li a[aria-current="page"] {
    border-left: 3px solid var(--color-gold);
  }
  .bird-mascot {
    order: 0;
    margin-left: auto;
  }
  .nav-toggle {
    display: flex;
    order: 1;
    margin-left: var(--spacing-sm);
  }
  .nav-toggle[aria-expanded="true"] + .main-nav {
    display: block;
  }
  .nav-wrapper .main-nav[data-open] {
    display: block;
  }
}

/* === REDUCED MOTION GLOBAL === */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
  .bird-mascot:hover {
    transform: none;
  }
  .card-float:hover {
    transform: none;
  }
  .btn:active {
    transform: none;
  }
  .nav-toggle-bar {
    transition: none;
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar {
    transform: none;
    opacity: 1;
  }
}

/* === BREADCRUMB (基础) === */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) 0;
  font-size: 0.8rem;
  color: rgba(43, 29, 29, 0.6);
}
.breadcrumb a {
  color: var(--color-primary-light);
  transition: color var(--transition-fast);
}
.breadcrumb a:hover {
  color: var(--color-gold);
}
.breadcrumb .separator {
  display: inline-block;
  width: 4px;
  height: 4px;
  background: var(--color-gray);
  border-radius: 50%;
  margin: 0 var(--spacing-xs);
}

/* === IMAGE CONTAINER (基础占位规则) === */
.img-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: rgba(230, 184, 0, 0.4);
  font-family: var(--font-data);
  font-size: 0.7rem;
  border-radius: var(--radius-md);
  aspect-ratio: 16 / 9;
  overflow: hidden;
  position: relative;
}
.img-placeholder::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 40%, rgba(230, 184, 0, 0.05) 100%);
  pointer-events: none;
}

/* === MISC UTILITY === */
.text-gold { color: var(--color-gold); }
.text-green { color: var(--color-green); }
.text-orange { color: var(--color-orange); }
.text-dark { color: var(--color-dark); }
.text-muted { color: rgba(43, 29, 29, 0.55); }
.bg-primary { background: var(--color-primary); }
.bg-cream { background: var(--color-cream); }
.font-data { font-family: var(--font-data); }
.font-heading { font-family: var(--font-heading); font-style: italic; font-weight: 700; }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.p-lg { padding: var(--spacing-lg); }
.text-center { text-align: center; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }

/* === ACCESSIBLE RESPONSIVE TABLES === */
.responsive-table {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-md);
}
.responsive-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.responsive-table th {
  background: var(--color-primary);
  color: var(--color-gold);
  font-family: var(--font-heading);
  font-weight: 700;
  font-style: italic;
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
}
.responsive-table td {
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid rgba(10, 31, 63, 0.06);
  background: rgba(245, 240, 225, 0.5);
}
.responsive-table tr:last-child td {
  border-bottom: none;
}

/* === PRINT === */
@media print {
  .site-header, .site-footer, .scroll-progress, .nav-toggle, .bird-mascot {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  .container {
    max-width: 100%;
    padding: 0;
  }
}