/* ============ 1. Variables ============ */
:root {
  --color-navy: #122B40;
  --color-navy-deep: #0A1B2A;
  --color-snow: #F9F9F4;
  --color-red: #C63627;
  --color-gold: #D9A441;
  --color-yellow: #E8C55F;
  --color-green: #2E8B6E;
  --color-blue: #4A7AB0;
  --color-pale: #EFF5F8;
  --color-ink: #1E1E1C;
  --color-gray: #E5E1D9;

  --font-heading: "Heiti SC", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --font-body: "Songti SC", "SimSun", "Noto Serif SC", Georgia, serif;

  --header-height: 64px;
  --nav-width: 254px;
  --content-max: 1280px;
  --gap: 24px;
  --radius-sm: 4px;
  --radius-md: 10px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

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

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

main { display: block; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-ink);
  background: var(--color-snow);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: var(--color-blue); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 1px; }

p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.4em; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-navy);
  margin: 0 0 0.5em;
}

/* ============ 3. Focus & Reduced Motion ============ */
:focus-visible {
  outline: 3px solid var(--color-gold);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
  .has-js [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* ============ 4. Layout Skeleton ============ */
#main-content {
  margin-left: var(--nav-width);
  padding-top: var(--header-height);
  min-height: 60vh;
}

@media (max-width: 1023px) {
  #main-content { margin-left: 0; }
}

/* ============ 5. Skip Link ============ */
.skip-link {
  position: fixed;
  left: -999px;
  top: 12px;
  z-index: 300;
  background: var(--color-navy);
  color: var(--color-snow);
  padding: 12px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
}
.skip-link:focus { left: var(--nav-width); }

@media (max-width: 1023px) {
  .skip-link:focus { left: 0; }
}

/* ============ 6. Reading Progress ============ */
.reading-progress {
  position: fixed;
  top: 0;
  left: var(--nav-width);
  right: 0;
  height: 3px;
  z-index: 220;
  background: linear-gradient(90deg, var(--color-red), var(--color-gold));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

@media (max-width: 1023px) {
  .reading-progress { left: 0; }
}

/* ============ 7. Header Topbar ============ */
.site-header { display: contents; }

.header-topbar {
  position: fixed;
  top: 0;
  left: var(--nav-width);
  right: 0;
  height: var(--header-height);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  background: rgba(249, 249, 244, 0.94);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-gray);
}

@media (max-width: 1023px) {
  .header-topbar {
    left: 0;
    padding: 0 16px;
  }
}

/* ============ 8. Brand ============ */
.brand {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  text-decoration: none;
}
.brand-name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 22px;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--color-navy);
}
.brand-tag {
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--color-blue);
}

/* ============ 9. Header Actions ============ */
.header-topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-quick {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--color-red);
  color: #fff;
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 14px;
  line-height: 1;
  text-decoration: none;
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
}
.btn-quick:hover {
  background: #a52b20;
  box-shadow: 0 4px 14px rgba(198, 54, 39, 0.25);
}
.btn-quick-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-yellow);
}
.btn-quick-text { letter-spacing: 0.02em; }

/* ============ 10. Nav Toggle ============ */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
}
.nav-toggle-line {
  display: block;
  width: 22px;
  height: 3px;
  border-radius: 2px;
}
.nav-toggle-line:nth-child(1) { background: var(--color-red); }
.nav-toggle-line:nth-child(2) { background: var(--color-gold); }
.nav-toggle-line:nth-child(3) { background: var(--color-green); }

@media (max-width: 1023px) {
  .nav-toggle { display: inline-flex; }
}

/* ============ 11. Side Nav ============ */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--nav-width);
  z-index: 240;
  display: flex;
  flex-direction: column;
  padding: 28px 20px 20px;
  background: var(--color-navy);
  color: var(--color-snow);
  overflow-y: auto;
  transition: transform var(--transition-base);
}
.site-nav::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-red) 0 25%, var(--color-gold) 25% 50%, var(--color-green) 50% 75%, var(--color-blue) 75% 100%);
}

@media (max-width: 1023px) {
  .site-nav {
    width: min(320px, 84vw);
    transform: translateX(-105%);
    box-shadow: 8px 0 24px rgba(10, 27, 42, 0.25);
  }
  .site-nav[data-open] { transform: translateX(0); }
}

.site-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}
.site-nav-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.nav-close {
  display: none;
  background: none;
  border: none;
  color: var(--color-snow);
  font-family: var(--font-heading);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  padding: 4px 8px;
}
.nav-close:hover { color: var(--color-gold); }

@media (max-width: 1023px) {
  .nav-close { display: block; }
}

/* ============ 12. Nav List ============ */
.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}
.nav-item { margin: 0; padding: 0; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 12px;
  border-radius: var(--radius-sm);
  color: rgba(249, 249, 244, 0.82);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 15px;
  line-height: 1.2;
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.nav-link:hover {
  color: var(--color-snow);
  background: rgba(249, 249, 244, 0.08);
}
.nav-index {
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: 0.08em;
  opacity: 0.85;
}
.nav-label { flex: 1; }

.nav-link.is-scroll-active {
  background: rgba(217, 164, 65, 0.12);
  color: var(--color-snow);
  border-left-color: var(--color-gold);
}
.nav-link[aria-current="page"] {
  background: rgba(249, 249, 244, 0.12);
  color: var(--color-snow);
  border-left-color: var(--color-red);
}

/* ============ 13. Site Nav Footer ============ */
.site-nav-footer {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid rgba(249, 249, 244, 0.14);
}
.nav-trust {
  font-family: var(--font-body);
  font-size: 12px;
  line-height: 1.6;
  color: rgba(249, 249, 244, 0.6);
  margin: 0 0 8px;
}
.nav-badge {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--color-yellow);
  background: rgba(232, 197, 95, 0.14);
  padding: 4px 10px;
  border-radius: 2px;
}

/* ============ 14. Nav Scrim ============ */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 230;
  background: rgba(10, 27, 42, 0.5);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}
.nav-scrim[data-open] {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

@media (min-width: 1024px) {
  .nav-scrim { display: none; }
}

/* ============ 15. Footer ============ */
.site-footer {
  margin-left: var(--nav-width);
  background: var(--color-navy);
  color: rgba(249, 249, 244, 0.78);
  position: relative;
}
.site-footer::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--color-red) 0 25%, var(--color-gold) 25% 50%, var(--color-green) 50% 75%, var(--color-blue) 75% 100%);
}

.site-footer-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 48px 32px 40px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.6fr;
  gap: 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}
.brand-footer { text-decoration: none; }
.brand-footer .brand-name { color: var(--color-snow); }
.brand-footer .brand-tag { color: rgba(249, 249, 244, 0.55); }
.footer-brand-desc {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(249, 249, 244, 0.55);
  margin: 0;
  max-width: 260px;
}

.footer-col { min-width: 0; }
.footer-heading {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin: 0 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(249, 249, 244, 0.12);
}

.footer-link-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-link-list a {
  color: rgba(249, 249, 244, 0.7);
  text-decoration: none;
  font-family: var(--font-body);
  font-size: 14px;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}
.footer-link-list a:hover {
  color: var(--color-snow);
  padding-left: 4px;
}

.footer-contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-contact-item {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.5;
}
.footer-contact-item a {
  color: rgba(249, 249, 244, 0.7);
  text-decoration: none;
}
.footer-contact-item a:hover { color: var(--color-gold); }
.footer-phone {
  color: rgba(249, 249, 244, 0.85);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.footer-address { color: rgba(249, 249, 244, 0.55); }

.site-footer-legal {
  border-top: 1px solid rgba(249, 249, 244, 0.1);
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 18px 32px 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-body);
  font-size: 12px;
  color: rgba(249, 249, 244, 0.45);
}
.footer-copyright,
.footer-icp,
.footer-contact-note {
  display: inline-block;
}

@media (max-width: 1023px) {
  .site-footer { margin-left: 0; }
  .site-footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px 24px;
    padding: 40px 20px;
  }
}
@media (max-width: 640px) {
  .site-footer-inner { grid-template-columns: 1fr; }
  .site-footer-legal {
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 20px;
    gap: 6px;
  }
}

/* ============ 16. Container ============ */
.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 32px;
}
@media (max-width: 640px) {
  .container { padding: 0 20px; }
}

/* ============ 17. Page Heading ============ */
.page-heading {
  padding: clamp(48px, 8vw, 92px) 32px 32px;
  background: linear-gradient(150deg, var(--color-pale), var(--color-snow));
  border-bottom: 1px solid var(--color-gray);
}
.page-heading-inner {
  max-width: var(--content-max);
  margin: 0 auto;
}
.page-heading-kicker {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-red);
  padding-bottom: 6px;
  border-bottom: 2px solid var(--color-gold);
  margin-bottom: 18px;
}
.page-heading-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(40px, 6vw, 76px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--color-navy);
  margin: 0 0 16px;
}
.page-heading-desc {
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.8;
  color: rgba(30, 30, 28, 0.8);
  max-width: 640px;
  margin: 0;
}
@media (max-width: 640px) {
  .page-heading { padding: 40px 20px 24px; }
}

/* ============ 18. Section Heading ============ */
.section-heading {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 24px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-navy);
}
.section-num {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 15px;
  color: var(--color-red);
}
.section-title {
  font-family: var(--font-heading);
  font-size: 30px;
  font-weight: 700;
  color: var(--color-navy);
  line-height: 1.2;
}
.section-more {
  margin-left: auto;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 13px;
  color: var(--color-gold);
  text-decoration: none;
}
.section-more:hover { color: var(--color-red); }
@media (max-width: 640px) {
  .section-heading { flex-wrap: wrap; }
  .section-more { margin-left: 0; }
}

/* ============ 19. Breadcrumb ============ */
.breadcrumb {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 24px 0 0;
  font-family: var(--font-body);
  font-size: 13px;
  color: rgba(30, 30, 28, 0.6);
}
.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb li + li::before {
  content: "/";
  color: rgba(30, 30, 28, 0.3);
}
.breadcrumb a {
  color: var(--color-blue);
  text-decoration: none;
}
.breadcrumb a:hover { text-decoration: underline; }

/* ============ 20. Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  border: none;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 15px;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition-fast), box-shadow var(--transition-fast), color var(--transition-fast);
}
.btn-primary {
  background: var(--color-red);
  color: #fff;
}
.btn-primary:hover {
  background: #a52b20;
  box-shadow: 0 4px 14px rgba(198, 54, 39, 0.25);
}
.btn-secondary {
  background: transparent;
  color: var(--color-navy);
  box-shadow: inset 0 0 0 2px var(--color-navy);
}
.btn-secondary:hover {
  background: var(--color-navy);
  color: #fff;
}
.btn-gold {
  background: var(--color-gold);
  color: var(--color-navy);
}
.btn-gold:hover {
  background: var(--color-yellow);
  box-shadow: 0 4px 14px rgba(217, 164, 65, 0.3);
}

/* ============ 21. Tags ============ */
.tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 12px;
  line-height: 1.5;
  padding: 3px 10px;
  border-radius: 2px;
}
.tag-red {
  background: rgba(198, 54, 39, 0.12);
  color: var(--color-red);
}
.tag-gold {
  background: rgba(217, 164, 65, 0.18);
  color: #8a6522;
}
.tag-green {
  background: rgba(46, 139, 110, 0.12);
  color: var(--color-green);
}
.tag-blue {
  background: rgba(74, 122, 176, 0.12);
  color: var(--color-blue);
}

/* ============ 22. Grid ============ */
.grid {
  display: grid;
  gap: var(--gap);
}
.grid-col-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-col-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-col-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 1023px) {
  .grid-col-3,
  .grid-col-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .grid-col-2,
  .grid-col-3,
  .grid-col-4 { grid-template-columns: 1fr; }
}

/* ============ 23. Image Frames ============ */
.image-frame {
  position: relative;
  overflow: hidden;
  background: var(--color-pale);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
}
.image-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.image-frame-wide { aspect-ratio: 16 / 9; }
.image-frame-portrait { aspect-ratio: 3 / 4; }
.image-frame-square { aspect-ratio: 1 / 1; }

/* ============ 24. Story Card ============ */
.story-card {
  background: var(--color-snow);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}
.story-card:hover {
  box-shadow: 0 8px 28px rgba(18, 43, 64, 0.08);
  transform: translateY(-3px);
}
.story-card-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.4;
  color: var(--color-navy);
  margin: 0 0 8px;
}
.story-card-meta {
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.6;
  color: rgba(30, 30, 28, 0.6);
}

/* ============ 25. Utilities ============ */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.has-js [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}