:root {
  --header-w: 280px;
  --header-h: 64px;
  --container-w: 1200px;
  --color-paper: #F5F0E6;
  --color-paper-deep: #D6CFC4;
  --color-ink: #1E1A17;
  --color-ink-soft: #6B6B6B;
  --color-blue: #1E6FFF;
  --color-red: #E83A3A;
  --color-green: #00B05A;
  --color-cyan: #00E5F0;
  --color-purple: #6E3AA8;
  --color-bg-dark: #0B0A0F;
  --color-header: #16131A;
  --color-line: #342B3A;
  --font-heading: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-body: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --shadow-paper: 8px 8px 0 rgba(30, 26, 23, 0.10);
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-bg-dark);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.8;
  padding-left: var(--header-w);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  margin: 0 0 0.5em;
  font-family: var(--font-heading);
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: inherit;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--color-blue);
}

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

button {
  font: inherit;
  cursor: pointer;
}

::selection {
  background: var(--color-cyan);
  color: var(--color-ink);
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 50%;
  z-index: 2000;
  background: var(--color-blue);
  color: #fff;
  padding: 10px 16px;
  font-weight: 700;
  text-decoration: none;
  border-radius: 2px;
  transform: translateX(-50%) translateY(-300%);
}

.skip-link:focus {
  transform: translateX(-50%) translateY(0);
  color: #fff;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
  width: var(--header-w);
  height: 100vh;
  background: linear-gradient(180deg, #16131A 0%, #1E1A17 100%);
  color: var(--color-paper);
  border-right: 1px solid var(--color-line);
}

.header-progress {
  position: absolute;
  z-index: 2;
  top: 0;
  left: 0;
  width: 3px;
  height: 0;
  background: linear-gradient(180deg, var(--color-cyan), var(--color-purple));
  pointer-events: none;
}

.header-shell {
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: 24px 20px 20px;
}

.brand-track {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 22px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--color-line);
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  text-decoration: none;
}

.brand-mark {
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-cyan), var(--color-purple));
  color: #0B0A0F;
  font-family: var(--font-heading);
  font-weight: 900;
  font-style: italic;
  font-size: 14px;
  padding: 4px 8px;
  clip-path: polygon(0 0, 100% 0, 88% 100%, 0 100%);
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-style: italic;
  font-size: 17px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-paper);
  white-space: nowrap;
}

.brand-logo:hover .brand-name {
  color: var(--color-cyan);
}

.nav-toggle {
  display: none;
}

.site-nav {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  padding-top: 12px;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1 1 auto;
  display: grid;
  align-content: start;
  gap: 6px;
  counter-reset: nav;
}

.nav-list a {
  position: relative;
  counter-increment: nav;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  color: #C6BFB8;
  text-decoration: none;
  font-family: var(--font-heading);
  font-weight: 700;
  font-style: italic;
  font-size: 16px;
  line-height: 1.2;
  border-left: 2px solid transparent;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.nav-list a::before {
  content: counter(nav, decimal-leading-zero);
  font-family: var(--font-body);
  font-style: normal;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-purple);
  letter-spacing: 0.08em;
}

.nav-list a::after {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: transparent;
  margin-left: auto;
  transition: background 0.2s, box-shadow 0.2s;
}

.nav-list a:hover {
  color: #fff;
  background: linear-gradient(90deg, rgba(110, 58, 168, 0.3), transparent);
  border-left-color: var(--color-purple);
}

.nav-list a[aria-current="page"] {
  color: #fff;
  background: linear-gradient(90deg, rgba(0, 229, 240, 0.18), rgba(110, 58, 168, 0.14) 70%, transparent);
  border-left-color: var(--color-cyan);
}

.nav-list a[aria-current="page"]::before {
  color: var(--color-cyan);
}

.nav-list a[aria-current="page"]::after {
  background: var(--color-cyan);
  box-shadow: 0 0 8px var(--color-cyan);
}

.header-status {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--color-line);
  color: #8FA3B4;
  font-size: 13px;
  letter-spacing: 0.04em;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-green);
  box-shadow: 0 0 10px var(--color-green);
  animation: status-pulse 2.4s ease-in-out infinite;
}

.status-copy {
  color: #8FA3B4;
}

@keyframes status-pulse {
  0%, 100% {
    opacity: 0.5;
    transform: scale(0.9);
  }
  50% {
    opacity: 1;
    transform: scale(1.1);
  }
}

.header-search {
  flex-shrink: 0;
  display: block;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--color-line);
}

.search-label {
  display: block;
  font-size: 12px;
  color: #8A7E91;
  letter-spacing: 0.12em;
  margin-bottom: 6px;
}

.search-input {
  width: 100%;
  padding: 10px 12px;
  background: #0B0A0F;
  border: 1px solid var(--color-line);
  color: var(--color-paper);
  font-family: var(--font-body);
  font-size: 14px;
  border-radius: 2px;
}

.search-input::placeholder {
  color: #6B5F6E;
}

.search-input:focus {
  border-color: var(--color-cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 240, 0.14);
  outline: none;
}

.site-footer {
  flex-shrink: 0;
  position: relative;
  margin: 24px 24px 24px 0;
  background: linear-gradient(180deg, #12100E, #0B0A0F);
  color: #C6BFB8;
  border-top: 1px solid var(--color-line);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-blue), var(--color-purple), var(--color-cyan));
}

.footer-shell {
  width: min(1200px, calc(100% - 48px));
  margin-inline: auto;
  padding: 56px 0 28px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 36px;
  border-bottom: 1px solid #2C2530;
}

.footer-brand--link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-paper);
  margin-bottom: 16px;
}

.footer-brand--mark {
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-cyan), var(--color-purple));
  color: #0B0A0F;
  font-family: var(--font-heading);
  font-weight: 900;
  font-style: italic;
  font-size: 14px;
  padding: 4px 8px;
  clip-path: polygon(0 0, 100% 0, 88% 100%, 0 100%);
}

.footer-brand--text {
  font-family: var(--font-heading);
  font-weight: 900;
  font-style: italic;
  font-size: 22px;
  letter-spacing: -0.02em;
}

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

.footer-trust {
  max-width: 46ch;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: #8FA3B4;
}

.footer-heading {
  margin: 0 0 14px;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  font-style: normal;
  letter-spacing: 0.14em;
  color: #8A7E91;
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.footer-links a {
  color: #C6BFB8;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.footer-links a:hover {
  color: #fff;
  border-bottom-color: var(--color-cyan);
}

.footer-contact {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: #8FA3B4;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  align-items: center;
  justify-content: space-between;
  padding-top: 22px;
  font-size: 13px;
  color: #6B6B6B;
}

.footer-support-note {
  flex-basis: 100%;
  color: #8A7E91;
}

#main-content {
  scroll-margin-top: 72px;
}

.site-main {
  flex: 1 0 auto;
  position: relative;
  background: var(--color-paper);
  margin: 24px 24px 0 0;
}

#main-content:focus {
  outline: none;
}

.container {
  width: min(1200px, calc(100% - 48px));
  margin-inline: auto;
}

.section {
  padding: clamp(48px, 7vw, 96px) 0;
}

.section--tight {
  padding: clamp(24px, 3vw, 48px) 0;
}

.breadcrumb {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 24px;
  padding: 0;
  font-size: 14px;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--color-ink-soft);
}

.breadcrumb a {
  color: var(--color-blue);
  text-decoration: none;
}

.breadcrumb [aria-current="page"] {
  color: var(--color-ink-soft);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid var(--color-ink);
  background: transparent;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: 700;
  font-style: italic;
  font-size: 15px;
  line-height: 1;
  text-decoration: none;
  border-radius: 2px;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s;
}

.btn:hover {
  background: var(--color-ink);
  color: var(--color-paper);
}

.btn-primary {
  background: var(--color-blue);
  border-color: var(--color-blue);
  color: #fff;
}

.btn-primary:hover {
  background: #0B50D0;
  border-color: #0B50D0;
  color: #fff;
}

.btn-secondary {
  border-color: var(--color-purple);
  color: var(--color-purple);
}

.btn-secondary:hover {
  background: var(--color-purple);
  border-color: var(--color-purple);
  color: #fff;
}

.panel {
  position: relative;
  background: var(--color-paper);
  border: 1px solid var(--color-paper-deep);
  box-shadow: var(--shadow-paper);
  padding: clamp(20px, 4vw, 32px);
}

.panel-dark {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-paper);
  box-shadow: 10px 10px 0 rgba(0, 0, 0, 0.3);
}

.panel-dark a {
  color: var(--color-cyan);
}

.tag {
  display: inline-block;
  padding: 3px 9px;
  background: var(--color-purple);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.4;
  transform: skewX(-6deg);
}

.tag--green {
  background: var(--color-green);
}

.tag--red {
  background: var(--color-red);
}

.tag--blue {
  background: var(--color-blue);
}

.vertical-note {
  display: inline-block;
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: 14px;
  color: var(--color-ink-soft);
  letter-spacing: 0.22em;
}

.data-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
}

.stat-card {
  position: relative;
  background: var(--color-paper);
  border: 1px solid var(--color-paper-deep);
  padding: 20px;
  overflow: hidden;
}

.stat-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-cyan), var(--color-purple));
  opacity: 0.8;
}

.stat-card span {
  display: block;
  font-size: 13px;
  color: var(--color-ink-soft);
  margin-bottom: 6px;
}

.stat-card strong {
  display: block;
  font-family: var(--font-heading);
  font-size: 28px;
  line-height: 1.1;
  color: var(--color-ink);
}

.image-frame {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--color-paper-deep), #EAE2D4);
  border: 1px solid var(--color-paper-deep);
  color: var(--color-ink-soft);
}

.image-frame::before {
  content: "影像位 / IMAGE";
  font-size: 13px;
  letter-spacing: 0.16em;
}

.image-frame img,
.image-frame > svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  z-index: 1;
}

.image-frame--portrait {
  aspect-ratio: 3 / 4;
}

.image-frame--wide {
  aspect-ratio: 21 / 9;
}

.image-frame--dark {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-paper-deep);
}

@media (max-width: 1023px) {
  body {
    padding-left: 0;
    padding-top: var(--header-h);
  }

  .site-header {
    width: 100%;
    height: var(--header-h);
    border-right: 0;
    border-bottom: 1px solid var(--color-line);
  }

  .header-shell {
    padding: 0 16px;
    flex-direction: row;
    align-items: center;
    gap: 16px;
  }

  .brand-track {
    flex: 1;
    min-width: 0;
    padding: 0;
    margin: 0;
    border: 0;
  }

  .brand-name {
    font-size: 16px;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    border: 1px solid var(--color-line);
    color: var(--color-paper);
    padding: 8px 10px;
    line-height: 1;
  }

  .nav-toggle--label {
    font-size: 13px;
    font-weight: 700;
    color: inherit;
  }

  .nav-toggle--icon {
    position: relative;
    display: block;
    width: 14px;
    height: 12px;
  }

  .nav-toggle--icon::before,
  .nav-toggle--icon::after {
    content: "";
    position: absolute;
    left: 0;
    width: 14px;
    height: 2px;
    background: var(--color-cyan);
    transition: transform 0.2s;
  }

  .nav-toggle--icon::before {
    top: 2px;
  }

  .nav-toggle--icon::after {
    top: 8px;
  }

  [data-nav-toggle][aria-expanded="true"] .nav-toggle--icon::before {
    transform: translateY(4px) rotate(45deg);
  }

  [data-nav-toggle][aria-expanded="true"] .nav-toggle--icon::after {
    transform: translateY(-2px) rotate(-45deg);
  }

  .site-nav {
    display: none;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    z-index: 999;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    background: #16131A;
    border-top: 1px solid var(--color-line);
    border-bottom: 1px solid var(--color-line);
    padding: 16px;
  }

  .site-nav[data-open] {
    display: flex;
    flex-direction: column;
  }

  .nav-list {
    padding-bottom: 8px;
  }

  .header-status {
    margin-top: 8px;
  }

  .header-search {
    margin-top: 8px;
  }

  .header-progress {
    top: auto;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-cyan), var(--color-purple));
  }

  .site-main {
    margin: 0;
    min-height: 50vh;
  }

  .site-footer {
    margin: 0;
  }
}

@media (max-width: 768px) {
  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .container {
    width: calc(100% - 32px);
  }

  .footer-shell {
    width: calc(100% - 32px);
    padding-top: 40px;
  }
}

@media (max-width: 480px) {
  .brand-name {
    font-size: 14px;
    letter-spacing: -0.01em;
  }

  .brand-mark {
    font-size: 12px;
    padding: 3px 6px;
  }

  .nav-toggle--label {
    display: none;
  }
}

@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;
  }

  .status-dot {
    animation: none;
  }

  .header-progress {
    transition: none;
  }
}