/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { background: var(--color-base); scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--color-text-primary);
  background-color: var(--color-base);
  background-image: repeating-linear-gradient(115deg, transparent 0, transparent 48px, rgba(57, 255, 20, 0.04) 49px, transparent 50px);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overflow-x: hidden;
}
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 1.15;
}
p { margin: 0; }
#main-content { display: block; scroll-margin-top: calc(var(--header-top-offset) + var(--header-height) + 24px); }

/* ===== Variables ===== */
:root {
  --color-base: #0B1D3A;
  --color-surface: #13294B;
  --color-accent: #39FF14;
  --color-accent-soft: #39FF14AA;
  --color-text-primary: #FFFFFF;
  --color-text-muted: #B0B8C8;
  --color-light-surface: #F0F4F8;
  --color-border: #2A3B5A;
  --color-success: #00D27A;
  --color-warning: #FFB800;
  --font-display: Impact, 'Arial Black', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  --font-body: 'Open Sans', 'Helvetica Neue', Arial, 'Microsoft YaHei', 'PingFang SC', sans-serif;
  --font-size-body: 1rem;
  --font-size-small: 0.875rem;
  --radius-lg: 24px;
  --radius-md: 14px;
  --radius-pill: 999px;
  --container: 1200px;
  --container-pad: 24px;
  --header-top-offset: 16px;
  --header-height: 68px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ===== Accessibility ===== */
.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;
}
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 300;
  padding: 12px 24px;
  background: var(--color-accent);
  color: var(--color-base);
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: var(--radius-pill);
  transform: translateY(-220%);
  transition: transform var(--transition-fast);
}
.skip-link:focus-visible { transform: translateY(0); }

/* ===== Scroll Progress ===== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  z-index: 400;
  background: linear-gradient(90deg, var(--color-accent), #7BFF5E);
  border-radius: 0 999px 999px 0;
  pointer-events: none;
}

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: var(--header-top-offset);
  z-index: 200;
  max-width: calc(var(--container) - 32px);
  margin: var(--header-top-offset) auto 0;
  padding: 0 28px;
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  background: rgba(19, 41, 75, 0.86);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-pill);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.28);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex: 1;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: var(--color-accent);
  color: var(--color-base);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.35rem;
  line-height: 1;
  border-radius: var(--radius-md);
  transform: skewX(-6deg);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.brand:hover .brand-mark {
  transform: skewX(-6deg) rotate(-4deg) scale(1.05);
  box-shadow: 0 0 20px var(--color-accent-soft);
}
.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.2;
}
.brand-name {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-primary);
}
.brand-sublabel {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.site-nav ul.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.site-nav .nav-item a {
  display: block;
  padding: 10px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  color: var(--color-text-muted);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.site-nav .nav-item a:hover,
.site-nav .nav-item a:focus-visible {
  color: var(--color-text-primary);
  background: rgba(57, 255, 20, 0.12);
}
.site-nav .nav-item a[aria-current="page"] {
  color: var(--color-base);
  background: var(--color-accent);
  font-weight: 800;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.btn-login {
  white-space: nowrap;
  font-weight: 800;
  letter-spacing: 0.04em;
}

/* ===== Nav Toggle ===== */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: background var(--transition-fast);
}
.nav-toggle:hover { background: rgba(255, 255, 255, 0.12); }
.nav-toggle-bar {
  width: 20px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}
.nav-toggle.is-active .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-active .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle.is-active .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Mobile Nav ===== */
@media (max-width: 1024px) {
  .nav-toggle { display: flex; }
  .btn-login { display: none; }
  .site-header {
    max-width: calc(100% - 24px);
    padding: 0 20px;
  }
  .site-nav {
    position: fixed;
    top: calc(var(--header-top-offset) + var(--header-height) + 10px);
    left: 16px;
    right: 16px;
    z-index: 199;
    max-height: calc(100vh - var(--header-height) - 60px);
    overflow-y: auto;
    padding: 16px;
    background: rgba(19, 41, 75, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  }
  .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }
  .site-nav .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }
  .site-nav .nav-item a {
    padding: 14px 18px;
    font-size: 1rem;
  }
}
@media (max-width: 640px) {
  :root { --header-top-offset: 8px; }
  .site-header { margin-top: 8px; }
  .brand-name { font-size: 0.92rem; }
  .brand-sublabel { display: none; }
  .brand-mark { width: 38px; height: 38px; font-size: 1.2rem; }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  line-height: 1;
  text-transform: none;
  letter-spacing: 0.02em;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0) scale(0.98); }
.btn-accent {
  background: var(--color-accent);
  color: var(--color-base);
  box-shadow: 0 4px 20px rgba(57, 255, 20, 0.22);
}
.btn-accent:hover { box-shadow: 0 6px 30px rgba(57, 255, 20, 0.38); }
.btn-primary {
  background: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}
.btn-primary:hover { border-color: var(--color-accent); box-shadow: 0 6px 24px rgba(0, 0, 0, 0.25); }
.btn-outline {
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
}
.btn-outline:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* ===== Section ===== */
.section {
  position: relative;
  padding: clamp(56px, 8vw, 120px) 0;
}
.section--band {
  background: var(--color-surface);
}
.section--light {
  background: var(--color-light-surface);
  color: var(--color-base);
}
.section--light .section-title,
.section--light .section-subtitle { color: var(--color-base); }
.section--light .section-subtitle { color: #3A4A63; }
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px 32px;
  margin-bottom: clamp(28px, 4vw, 48px);
}
.section-index {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.section-index::before {
  content: '';
  width: 30px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.6rem);
  margin-top: 8px;
}
.section-subtitle {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.95rem;
  line-height: 1.6;
  text-transform: none;
  letter-spacing: 0.01em;
  color: var(--color-text-muted);
  max-width: 56ch;
  margin-top: 10px;
}

/* ===== Grid ===== */
.grid {
  display: grid;
  gap: 24px;
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1000px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ===== Cards ===== */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.3);
}
.card--light {
  background: var(--color-light-surface);
  border-color: transparent;
  color: var(--color-base);
}
.card--light .card-text { color: #3A4A63; }
.card-header { margin-bottom: 16px; }
.card-title { font-size: 1.15rem; margin-bottom: 8px; }
.card-text {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 0.9rem;
  line-height: 1.6;
  text-transform: none;
  letter-spacing: 0.01em;
  color: var(--color-text-muted);
}

/* ===== Badges ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  background: rgba(57, 255, 20, 0.1);
  color: var(--color-accent);
  border: 1px solid rgba(57, 255, 20, 0.25);
  border-radius: var(--radius-pill);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.footer-badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

/* ===== Legend ===== */
.legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  padding: 14px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}
.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}
.legend-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-accent);
  flex-shrink: 0;
}
.legend-dot--success { background: var(--color-success); }
.legend-dot--warning { background: var(--color-warning); }
.legend-dot--muted { background: var(--color-text-muted); }

/* ===== Breadcrumbs ===== */
.breadcrumb {
  padding: 18px 0 6px;
}
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
  color: var(--color-text-muted);
}
.breadcrumb-item a { color: var(--color-text-muted); transition: color var(--transition-fast); }
.breadcrumb-item a:hover { color: var(--color-accent); }
.breadcrumb-item[aria-current="page"] {
  color: var(--color-text-primary);
  font-weight: 600;
}
.breadcrumb-sep { color: var(--color-border); }

/* ===== Filter Bar ===== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.filter-btn {
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  font-size: 0.84rem;
  font-weight: 600;
  background: var(--color-surface);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}
.filter-btn:hover {
  color: var(--color-text-primary);
  border-color: var(--color-accent);
  transform: translateY(-1px);
}
.filter-btn.is-active {
  background: var(--color-accent);
  color: var(--color-base);
  border-color: var(--color-accent);
  font-weight: 800;
}
.is-filtered { display: none !important; }

/* ===== Timeline ===== */
.timeline {
  position: relative;
  padding-left: 34px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 10px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent) 0%, var(--color-border) 40%, var(--color-border) 100%);
  border-radius: 2px;
}
.timeline-item {
  position: relative;
  padding: 18px 22px;
  margin-bottom: 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -29px;
  top: 24px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--color-base);
  border: 3px solid var(--color-accent);
}
.timeline-item:hover {
  transform: translateX(4px);
  border-color: rgba(57, 255, 20, 0.4);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.25);
}
.timeline-item.is-current {
  border-color: var(--color-accent);
  box-shadow: 0 8px 32px rgba(57, 255, 20, 0.15);
}
.timeline-item.is-current::before {
  background: var(--color-accent);
  box-shadow: 0 0 0 5px rgba(57, 255, 20, 0.18);
}

/* ===== Image Ratio ===== */
.image-ratio {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
}
.image-ratio::before {
  content: '';
  display: block;
  padding-top: 56.25%;
}
.image-ratio--square::before { padding-top: 100%; }
.image-ratio--portrait::before { padding-top: 125%; }
.image-cover {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===== Footer ===== */
.site-footer {
  position: relative;
  margin-top: 96px;
  padding: 64px 0 32px;
  background: linear-gradient(180deg, var(--color-base) 0%, #060F22 100%);
  border-top: 1px solid var(--color-border);
}
.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 10%;
  right: 10%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  border-radius: var(--radius-pill);
  opacity: 0.6;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 0.8fr 1.2fr;
  gap: 40px;
}
.footer-brand .brand { margin-bottom: 18px; }
.footer-about {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  max-width: 32ch;
  line-height: 1.6;
}
.footer-title {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  margin-bottom: 18px;
}
.footer-link-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-link-list a,
.footer-link-list li {
  color: var(--color-text-muted);
  font-size: 0.88rem;
  line-height: 1.5;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}
.footer-link-list a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}
.contact-note {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.8rem;
  line-height: 1.6;
}
.footer-bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 24px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}
.footer-icp {
  letter-spacing: 0.05em;
}
@media (max-width: 1000px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

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