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

:root {
  --color-bg: #0B1D3A;
  --color-bg-deep: #061224;
  --color-bg-grad: linear-gradient(180deg, #0F2A4A 0%, #0B1D3A 45%, #061224 100%);
  --color-card: #1A2B3C;
  --color-accent: #39FF14;
  --color-warning: #FFB300;
  --color-link: #7DD3FC;
  --color-danger: #E63946;
  --color-text: #FFFFFF;
  --color-muted: #C0C8D0;
  --header-height: 64px;
  --container-width: 1280px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 40px;
  --space-6: 64px;
  --radius: 6px;
  --transition-fast: 160ms ease;
  --transition-base: 220ms ease;
  --font-serif: "Noto Serif SC", Georgia, "Songti SC", "STSong", serif;
  --font-sans: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", Consolas, "Courier New", monospace;
  --clip-cut: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

/* ========== Base ========== */
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  background-image: var(--color-bg-grad);
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

img, svg, video { max-width: 100%; display: block; }
a { color: var(--color-link); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-accent); }
a:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; border-radius: 2px; }
ul, ol { list-style: none; }
button { font-family: inherit; }

/* ========== Layout ========== */
.container {
  width: min(var(--container-width), 100% - 2 * var(--space-4));
  margin-inline: auto;
}

.container-narrow {
  width: min(860px, 100% - 2 * var(--space-4));
  margin-inline: auto;
}

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

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 2000;
  padding: 10px 18px;
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 700;
  font-size: 14px;
  border-radius: 4px;
  transform: translateY(-200%);
  transition: transform var(--transition-base);
}

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

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

/* ========== Scroll Progress ========== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-link));
  z-index: 1200;
  pointer-events: none;
}

/* ========== Header ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(11, 29, 58, 0.86);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(57, 255, 20, 0.35);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  height: 100%;
  position: relative;
}

/* Brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--color-text);
  text-decoration: none;
}

.brand:hover {
  color: var(--color-text);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 900;
  font-size: 18px;
  border-radius: 4px;
  transform: skew(-6deg);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.35);
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1;
  white-space: nowrap;
}

.brand-name em {
  display: inline-block;
  font-style: normal;
  font-weight: 400;
  font-size: 0.82em;
  color: var(--color-muted);
  margin-left: 3px;
  letter-spacing: 0.1em;
}

/* Navigation */
.nav-wrap {
  margin-inline: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  display: inline-block;
  padding: 7px 14px;
  border-radius: 4px;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.5;
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.08);
}

.nav-link[aria-current="page"] {
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 700;
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.25);
}

.nav-link[aria-current="page"]:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* Header status */
.header-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 12px;
  border: 1px solid rgba(57, 255, 20, 0.3);
  border-radius: 999px;
  background: rgba(57, 255, 20, 0.07);
  flex-shrink: 0;
  margin-right: var(--space-1);
}

.status-text {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--color-muted);
  white-space: nowrap;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.5);
  animation: statusPulse 2s ease-out infinite;
}

@keyframes statusPulse {
  0% { box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.45); }
  70% { box-shadow: 0 0 0 6px rgba(57, 255, 20, 0); }
  100% { box-shadow: 0 0 0 0 rgba(57, 255, 20, 0); }
}

/* Nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  cursor: pointer;
  margin-left: auto;
  flex-shrink: 0;
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-text);
  border-radius: 2px;
  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 {
  position: relative;
  margin-top: var(--space-6);
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-deep) 100%);
  border-top: 2px solid rgba(57, 255, 20, 0.25);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 220px;
  height: 2px;
  background: var(--color-accent);
  clip-path: polygon(0 0, 100% 0, 82% 100%, 0 100%);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: var(--space-5);
  padding-top: var(--space-5);
  padding-bottom: var(--space-4);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-3);
}

.footer-desc {
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.8;
  max-width: 340px;
}

.footer-contact,
.footer-links {
  display: flex;
  flex-direction: column;
}

.footer-heading {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-3);
  padding-left: 12px;
  border-left: 3px solid var(--color-accent);
}

.footer-contact-list,
.footer-link-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-contact-list li,
.footer-link-list li {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-muted);
}

.contact-label {
  color: var(--color-text);
  font-weight: 600;
}

.footer-link-list a {
  display: inline-block;
  color: var(--color-muted);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.footer-link-list a:hover {
  color: var(--color-accent);
  transform: translateX(3px);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  padding: var(--space-3) 0;
  background: rgba(0, 0, 0, 0.18);
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3) var(--space-4);
  font-size: 12px;
  color: var(--color-muted);
}

.trust-text {
  width: 100%;
  font-size: 12px;
  line-height: 1.7;
  color: rgba(192, 200, 208, 0.82);
  margin-bottom: var(--space-2);
}

.copyright {
  margin-right: auto;
  font-size: 12px;
  letter-spacing: 0.03em;
}

.icp {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(192, 200, 208, 0.85);
}

/* ========== Back to top ========== */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 6px;
  border: 1px solid rgba(57, 255, 20, 0.4);
  background: rgba(11, 29, 58, 0.92);
  color: var(--color-accent);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base), background var(--transition-fast), color var(--transition-fast);
  z-index: 800;
}

.back-to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* ========== Buttons ========== */
.btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  border: 1px solid transparent;
  cursor: pointer;
  text-align: center;
  transition: background var(--transition-base), color var(--transition-base), border-color var(--transition-base), transform var(--transition-fast);
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
}

.btn-primary:hover {
  background: var(--color-text);
  color: var(--color-bg);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  border-color: rgba(57, 255, 20, 0.6);
  color: var(--color-accent);
}

.btn-ghost:hover {
  background: rgba(57, 255, 20, 0.1);
  border-color: var(--color-accent);
  transform: translateY(-1px);
}

/* ========== Breadcrumb ========== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-muted);
}

.breadcrumb a {
  color: var(--color-link);
  transition: color var(--transition-fast);
}

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

.breadcrumb .sep {
  color: rgba(255, 255, 255, 0.35);
}

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

/* ========== Section kicker ========== */
.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.section-kicker::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--color-accent);
  flex-shrink: 0;
}

/* ========== Panels ========== */
.panel-base {
  position: relative;
  padding: var(--space-4);
  background: linear-gradient(145deg, rgba(26, 43, 60, 0.85), rgba(15, 42, 74, 0.55));
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  overflow: hidden;
}

.panel-base::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(57, 255, 20, 0.08) 0%, transparent 42%);
  pointer-events: none;
}

.panel-cut {
  composes: panel-base;
  clip-path: var(--clip-cut);
  padding: calc(var(--space-4) + 8px);
}

/* ========== Bento grid ========== */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-3);
}

.bento-col-3 { grid-column: span 3; }
.bento-col-4 { grid-column: span 4; }
.bento-col-5 { grid-column: span 5; }
.bento-col-6 { grid-column: span 6; }
.bento-col-7 { grid-column: span 7; }
.bento-col-8 { grid-column: span 8; }
.bento-col-12 { grid-column: span 12; }

/* ========== Timeline ========== */
.timeline {
  position: relative;
  padding-left: 30px;
  border-left: 2px solid rgba(57, 255, 20, 0.4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.timeline-item {
  position: relative;
  padding: var(--space-3);
  background: rgba(11, 29, 58, 0.55);
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -36px;
  top: 20px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.2);
}

.timeline-time {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent);
  margin-bottom: 4px;
  letter-spacing: 0.02em;
}

/* ========== Data / media ========== */
.data-mono {
  font-family: var(--font-mono);
  font-size: 0.95em;
  color: var(--color-accent);
  letter-spacing: -0.02em;
}

.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--color-bg-deep);
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--landscape { aspect-ratio: 16 / 9; }
.media-frame--portrait { aspect-ratio: 3 / 4; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--wide { aspect-ratio: 21 / 9; }

/* ========== Responsive ========== */
@media (max-width: 920px) {
  .header-status {
    display: none;
  }

  .nav-wrap {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    margin-inline: 0;
    padding: var(--space-3);
    background: rgba(6, 18, 36, 0.96);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border: 1px solid rgba(57, 255, 20, 0.25);
    border-radius: 6px;
    clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  }

  .nav-wrap[data-open] {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    display: block;
    padding: 12px 16px;
    font-size: 15px;
    border-radius: 4px;
  }

  .nav-toggle {
    display: flex;
  }

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

  .bento-col-3,
  .bento-col-4,
  .bento-col-5,
  .bento-col-6,
  .bento-col-7,
  .bento-col-8,
  .bento-col-12 {
    grid-column: 1;
  }
}

@media (max-width: 760px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
    padding-top: var(--space-4);
  }

  .footer-bottom-inner {
    flex-direction: column;
    text-align: center;
    gap: var(--space-2);
  }

  .copyright {
    margin-right: 0;
  }

  .back-to-top {
    right: 16px;
    bottom: 16px;
    width: 40px;
    height: 40px;
  }
}

/* ========== 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;
    transition-delay: 0ms !important;
  }

  .nav-wrap {
    transition: none !important;
  }
}