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

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

body {
  margin: 0;
  font-family: "Noto Sans SC", "Noto Sans CJK SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-ink);
  background-color: var(--color-warm-gray);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--color-bright-blue);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
  color: var(--color-green);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-family: inherit;
  font-weight: 900;
  line-height: 1.2;
  color: var(--color-ink);
  text-wrap: balance;
}

h1 {
  font-size: clamp(34px, 4.5vw, 60px);
  letter-spacing: -0.015em;
}

h2 {
  font-size: clamp(26px, 3vw, 40px);
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(20px, 2vw, 28px);
}

h4 {
  font-size: 18px;
}

p {
  margin: 0;
  text-wrap: pretty;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style-position: inside;
}

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

/* ============ Variables ============ */
:root {
  --color-green: #1F8A5B;
  --color-deep-blue: #0B1E36;
  --color-gold: #D4A017;
  --color-light-green: #E8F5EE;
  --color-dark-green: #0E5C3F;
  --color-bright-blue: #2E6E9E;
  --color-warm-gray: #F4F6F8;
  --color-ink: #1B2A23;
  --color-white: #FFFFFF;
  --color-highlight-gold: #F0C75A;

  --font-body: "Noto Sans SC", "Noto Sans CJK SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-heading: "Noto Sans SC", "Noto Sans CJK SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Cascadia Mono", "Roboto Mono", "Liberation Mono", Consolas, monospace;

  --header-width: 280px;
  --header-height-mobile: 64px;
  --container-max: 1280px;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-pill: 999px;

  --transition-fast: 0.2s ease;
  --transition-base: 0.3s cubic-bezier(0.22, 1, 0.36, 1);

  --shadow-soft: 0 12px 40px rgba(11, 30, 54, 0.12);
  --shadow-card: 0 4px 20px rgba(11, 30, 54, 0.06);

  --z-progress: 1600;
  --z-header: 1500;
  --z-overlay: 1400;
}

/* ============ Layout ============ */
.container {
  width: min(100% - clamp(32px, 6vw, 72px), var(--container-max));
  margin-inline: auto;
}

.main-content {
  margin-left: var(--header-width);
  min-height: 100vh;
  position: relative;
}

.section {
  padding-block: clamp(56px, 8vw, 96px);
  padding-inline: clamp(20px, 4vw, 56px);
}

.content-container {
  max-width: 760px;
  margin-inline: auto;
  padding: 48px clamp(20px, 4vw, 48px);
}

/* ============ Focus ============ */
:focus-visible {
  outline: 3px solid var(--color-highlight-gold);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ============ Skip Link ============ */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: calc(var(--z-progress) + 10);
  display: inline-flex;
  align-items: center;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  background: var(--color-gold);
  color: var(--color-deep-blue);
  font-weight: 700;
  font-size: 15px;
  text-decoration: none;
  box-shadow: var(--shadow-soft);
  transform: translateY(-200%);
  transition: transform 0.25s ease;
}

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

/* ============ Scroll Progress ============ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: var(--header-width);
  height: 3px;
  width: 0%;
  z-index: var(--z-progress);
  background: linear-gradient(90deg, var(--color-green) 0%, var(--color-gold) 55%, var(--color-highlight-gold) 100%);
  border-radius: 0 3px 3px 0;
  pointer-events: none;
}

/* ============ Header ============ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: var(--z-header);
  display: flex;
  flex-direction: column;
  width: var(--header-width);
  height: 100vh;
  background:
    repeating-linear-gradient(
      -55deg,
      transparent 0px,
      transparent 14px,
      rgba(255, 255, 255, 0.02) 14px,
      rgba(255, 255, 255, 0.02) 15px
    ),
    radial-gradient(circle at 20% 0%, rgba(31, 138, 91, 0.22), transparent 42%),
    linear-gradient(160deg, #0C3A29 0%, var(--color-deep-blue) 52%, #071426 100%);
  color: rgba(255, 255, 255, 0.75);
}

.header-bar {
  position: relative;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px 22px 16px;
  flex-shrink: 0;
}

/* ============ Brand ============ */
.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  min-width: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: 14px 5px 14px 5px;
  background: linear-gradient(135deg, var(--color-green), var(--color-dark-green));
  color: var(--color-white);
  font-size: 22px;
  font-weight: 900;
  transform: skewX(-5deg);
  box-shadow: 0 6px 20px rgba(31, 138, 91, 0.35);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  min-width: 0;
}

.brand-name {
  font-size: 20px;
  font-weight: 900;
  color: var(--color-white);
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.brand-sub {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--color-gold);
  text-transform: uppercase;
  white-space: nowrap;
}

/* ============ Nav Toggle ============ */
.nav-toggle {
  display: none;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.08);
  transition: background var(--transition-fast);
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.16);
}

.nav-toggle[aria-expanded="true"] {
  background: rgba(255, 255, 255, 0.14);
}

.nav-toggle-box {
  position: relative;
  width: 22px;
  height: 16px;
}

.nav-toggle-line {
  position: absolute;
  left: 0;
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-white);
  transition: transform 0.3s ease, opacity 0.2s ease;
}

.nav-toggle-line:nth-child(1) {
  top: 0;
}

.nav-toggle-line:nth-child(2) {
  top: 7px;
}

.nav-toggle-line:nth-child(3) {
  top: 14px;
}

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

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

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

/* ============ Navigation ============ */
.site-nav {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.18) transparent;
}

.nav-inner {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 16px 16px 20px;
}

.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  position: relative;
}

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 18px;
  border-radius: 14px;
  color: rgba(255, 255, 255, 0.68);
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.06);
}

.nav-link[aria-current="page"] {
  color: var(--color-white);
  background: linear-gradient(135deg, rgba(31, 138, 91, 0.38), rgba(31, 138, 91, 0.08));
  font-weight: 700;
}

.nav-link[aria-current="page"]::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 3px;
  border-radius: 3px;
  background: var(--color-gold);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-gold);
  opacity: 0.85;
  min-width: 22px;
}

.nav-label {
  flex: 1;
}

/* ============ Header Status ============ */
.header-status {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: auto;
  padding: 12px 16px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.05);
  color: rgba(255, 255, 255, 0.55);
  font-size: 13px;
}

.status-dot {
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-green);
  box-shadow: 0 0 8px rgba(31, 138, 91, 0.5);
  animation: status-pulse 2.2s ease-in-out infinite;
}

@keyframes status-pulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(31, 138, 91, 0.45);
  }
  50% {
    box-shadow: 0 0 0 6px rgba(31, 138, 91, 0);
  }
}

/* ============ Nav Overlay ============ */
.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background: rgba(7, 20, 32, 0.6);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.nav-overlay.is-visible {
  opacity: 1;
  visibility: visible;
}

/* ============ Footer ============ */
.site-footer {
  position: relative;
  margin-left: var(--header-width);
  background:
    radial-gradient(circle at 15% 15%, rgba(31, 138, 91, 0.08), transparent 36%),
    radial-gradient(circle at 90% 85%, rgba(212, 160, 23, 0.04), transparent 32%),
    linear-gradient(180deg, #081F38 0%, var(--color-deep-blue) 35%, #051426 100%);
  color: rgba(255, 255, 255, 0.66);
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  z-index: 3;
  background: linear-gradient(90deg, var(--color-green) 0%, var(--color-gold) 40%, transparent 80%);
  pointer-events: none;
}

.footer-pattern {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.025) 1px, transparent 1.5px);
  background-size: 30px 30px;
}

.footer-inner {
  position: relative;
  z-index: 1;
  max-width: var(--container-max);
  margin-inline: auto;
  padding: 72px clamp(20px, 4vw, 48px) 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1.3fr;
  gap: 48px;
  align-items: start;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.footer-brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 13px 4px 13px 4px;
  background: linear-gradient(135deg, var(--color-green), var(--color-dark-green));
  color: var(--color-white);
  font-size: 20px;
  font-weight: 900;
  transform: skewX(-5deg);
  box-shadow: 0 4px 14px rgba(31, 138, 91, 0.3);
}

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

.footer-brand-name {
  font-size: 19px;
  font-weight: 900;
  color: var(--color-white);
  letter-spacing: 0.03em;
}

.footer-brand-sub {
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--color-gold);
  text-transform: uppercase;
}

.footer-desc {
  max-width: 340px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.5);
}

.footer-col {
  min-width: 0;
}

.footer-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-white);
  margin-bottom: 18px;
}

.footer-link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link-list a {
  color: rgba(255, 255, 255, 0.55);
  text-decoration: none;
  font-size: 14px;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-link-list a:hover {
  color: var(--color-highlight-gold);
  padding-left: 4px;
}

.footer-contact {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-contact-item {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.45);
}

.footer-contact-label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.28);
  margin-bottom: 1px;
}

.footer-bottom {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.38);
}

.footer-note {
  font-size: 12px;
}

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 32px;
  border: 2px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.btn-primary {
  background: var(--color-gold);
  color: var(--color-deep-blue);
}

.btn-primary:hover {
  background: var(--color-highlight-gold);
  color: var(--color-deep-blue);
  box-shadow: 0 8px 24px rgba(212, 160, 23, 0.35);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  background: var(--color-light-green);
  color: var(--color-dark-green);
  transform: translateY(-2px);
}

.btn-dark {
  background: var(--color-deep-blue);
  color: var(--color-white);
}

.btn-dark:hover {
  background: #102A48;
  color: var(--color-white);
  transform: translateY(-2px);
}

/* ============ Breadcrumbs ============ */
.breadcrumbs {
  padding: 16px 0;
  font-size: 14px;
  color: #66756E;
}

.breadcrumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
}

.breadcrumbs-list li + li::before {
  content: '/';
  margin-right: 6px;
  color: #B8C4BE;
}

.breadcrumbs-list a {
  color: var(--color-bright-blue);
  text-decoration: none;
}

.breadcrumbs-list a:hover {
  text-decoration: underline;
  color: var(--color-green);
}

.breadcrumbs-list [aria-current="page"] {
  color: var(--color-ink);
  font-weight: 600;
}

/* ============ Grid ============ */
.grid {
  display: grid;
  gap: 24px;
}

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

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

/* ============ Card ============ */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

/* ============ Stat Card ============ */
.stat-card {
  position: relative;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.stat-card::after {
  content: '';
  position: absolute;
  right: -24px;
  bottom: -24px;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: var(--color-light-green);
  opacity: 0.55;
  pointer-events: none;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: clamp(32px, 3.5vw, 48px);
  font-weight: 700;
  color: var(--color-deep-blue);
  line-height: 1.1;
}

.stat-label {
  margin-top: 6px;
  font-size: 14px;
  color: #5A6B64;
}

/* ============ Tag ============ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  background: var(--color-light-green);
  color: var(--color-dark-green);
  font-size: 13px;
  font-weight: 600;
}

.tag--gold {
  background: rgba(212, 160, 23, 0.12);
  color: #A57A10;
}

/* ============ Image Frame ============ */
.img-frame {
  position: relative;
  display: block;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-light-green), #D5EBDF);
}

.img-frame--ratio {
  aspect-ratio: 16 / 9;
}

.img-frame--ratio-4x3 {
  aspect-ratio: 4 / 3;
}

.img-frame--ratio-1x1 {
  aspect-ratio: 1 / 1;
}

.img-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.img-frame-caption {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  background: rgba(11, 30, 54, 0.75);
  color: var(--color-white);
  font-size: 12px;
  letter-spacing: 0.02em;
}

/* ============ Reveal ============ */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s cubic-bezier(0.22, 1, 0.36, 1), transform 0.65s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============ Utilities ============ */
.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;
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
  .site-header {
    width: 100%;
    height: var(--header-height-mobile);
    flex-direction: row;
    align-items: center;
    background:
      radial-gradient(circle at 4% 50%, rgba(31, 138, 91, 0.2), transparent 30%),
      linear-gradient(90deg, #0C3A29 0%, var(--color-deep-blue) 70%);
  }

  .header-bar {
    width: 100%;
    padding: 0 16px;
    height: var(--header-height-mobile);
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 320px;
    height: 100vh;
    background: linear-gradient(160deg, #0C3A29 0%, var(--color-deep-blue) 45%, #071426 100%);
    box-shadow: 8px 0 32px rgba(0, 0, 0, 0.25);
    transform: translateX(-100%);
    transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  }

  .site-nav[data-open] {
    transform: translateX(0);
  }

  .nav-inner {
    padding-top: calc(var(--header-height-mobile) + 16px);
    padding-bottom: 32px;
  }

  .main-content {
    margin-left: 0;
  }

  body {
    padding-top: var(--header-height-mobile);
  }

  .site-footer {
    margin-left: 0;
  }

  .scroll-progress {
    left: 0;
  }

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

  .footer-brand-col {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .footer-brand-col {
    grid-column: auto;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 6px;
  }

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

/* ============ Reduced Motion ============ */
@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;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .scroll-progress {
    display: none;
  }

  .status-dot {
    animation: none;
  }

  .skip-link {
    transition: none;
  }
}