:root {
  --bg-deep: #121212;
  --bg-warm: #2C241B;
  --bg-night: #0A1E3F;
  --accent-green: #33FF99;
  --accent-blue: #2D6CFF;
  --accent-gold: #FFD700;
  --text-warm: #F5F1E8;
  --text-muted: #B8B2A7;
  --line: #3A3A3A;
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-pill: 999px;
  --font-heading: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --rail-width: 240px;
  --rail-collapsed: 80px;
  --header-height-mobile: 64px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

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

* {
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-warm);
  background-color: var(--bg-deep);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

button {
  font: inherit;
  color: inherit;
}

a {
  color: inherit;
}

ul[class],
ol[class] {
  list-style: none;
  margin: 0;
  padding: 0;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  font-weight: 800;
  font-style: italic;
  color: var(--text-warm);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

p {
  overflow-wrap: break-word;
}

:focus-visible {
  outline: 2px solid var(--accent-green);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: rgba(51, 255, 153, 0.25);
  color: var(--text-warm);
}

.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;
}

.container {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 48px);
}

#main-content {
  display: block;
  min-height: calc(100vh - 320px);
}

.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 500;
  transform: translateY(-200%);
  background: var(--accent-green);
  color: var(--bg-deep);
  font-weight: 700;
  font-size: 15px;
  padding: 10px 20px;
  border-radius: 0 0 14px 0;
  text-decoration: none;
  transition: transform 0.3s;
}

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

.site-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-blue));
  border-radius: 0 3px 3px 0;
  z-index: 400;
  pointer-events: none;
}

.site-header {
  position: relative;
  z-index: 300;
}

.site-header__bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height-mobile);
  background: var(--bg-deep);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 300;
}

.site-header__bar .site-brand {
  font-size: 18px;
}

.site-header__bar .site-brand__mark {
  width: 38px;
  height: 38px;
  flex-basis: 38px;
  font-size: 17px;
  border-radius: 12px;
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 12px;
  border: none;
  border-radius: 12px;
  background: transparent;
  cursor: pointer;
  transition: background 0.25s;
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.05);
}

.nav-toggle__line {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--text-warm);
  transition: transform 0.3s var(--ease-out), opacity 0.25s;
}

.nav-toggle--active .nav-toggle__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle--active .nav-toggle__line:nth-child(2) {
  opacity: 0;
}

.nav-toggle--active .nav-toggle__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-header__rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-width);
  background:
    radial-gradient(120% 80% at 100% 100%, rgba(45, 108, 255, 0.08) 0%, transparent 50%),
    var(--bg-warm);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 0 16px 20px;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 200;
  transition: transform 0.35s var(--ease-out), width 0.35s var(--ease-out), padding 0.35s var(--ease-out);
}

.site-header__rail-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 26px 8px 18px;
  min-height: 80px;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  overflow: hidden;
  color: var(--text-warm);
  text-decoration: none;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 20px;
  white-space: nowrap;
}

.site-brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
  color: var(--bg-deep);
  font-size: 20px;
  font-weight: 800;
  box-shadow: 0 4px 20px rgba(51, 255, 153, 0.3);
}

.site-brand__text {
  display: inline-block;
  max-width: 180px;
  opacity: 1;
  white-space: nowrap;
  overflow: hidden;
  transition: opacity 0.25s, max-width 0.3s var(--ease-out);
}

.rail-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  border: none;
  border-radius: 10px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.25s, background 0.25s;
}

.rail-toggle:hover {
  color: var(--text-warm);
  background: rgba(255, 255, 255, 0.06);
}

.rail-toggle svg {
  width: 18px;
  height: 18px;
  transition: transform 0.3s var(--ease-out);
}

.site-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 14px;
  border-radius: 14px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: background 0.25s, color 0.25s, gap 0.3s var(--ease-out), padding 0.3s var(--ease-out);
}

.site-nav__link:hover {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-warm);
}

.site-nav__link[aria-current="page"] {
  background: rgba(51, 255, 153, 0.1);
  color: var(--accent-green);
  font-weight: 600;
}

.site-nav__icon {
  width: 20px;
  height: 20px;
  flex: 0 0 20px;
}

.site-nav__label {
  display: inline-block;
  max-width: 180px;
  opacity: 1;
  white-space: nowrap;
  overflow: hidden;
  transition: opacity 0.25s, max-width 0.3s var(--ease-out);
}

.site-header__foot {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 16px 4px 0;
}

.site-header__search {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 11px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.2);
  color: var(--text-muted);
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  transition: border-color 0.25s, color 0.25s, width 0.3s var(--ease-out), padding 0.3s var(--ease-out);
}

.site-header__search:hover {
  border-color: var(--accent-blue);
  color: var(--text-warm);
}

.site-header__search svg {
  width: 16px;
  height: 16px;
  flex: 0 0 16px;
}

.site-header__status {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.status-pulse {
  width: 8px;
  height: 8px;
  flex: 0 0 8px;
  border-radius: 50%;
  background: var(--accent-green);
  animation: pulse 2.4s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(51, 255, 153, 0.5);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(51, 255, 153, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(51, 255, 153, 0);
  }
}

.status-text {
  font-weight: 600;
  color: var(--accent-green);
}

.status-time {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  white-space: nowrap;
}

.back-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--bg-warm);
  color: var(--text-warm);
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  z-index: 350;
  transition: opacity 0.3s, transform 0.3s var(--ease-out), border-color 0.25s, color 0.25s, background 0.25s;
}

.back-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-top:hover {
  border-color: var(--accent-green);
  background: rgba(51, 255, 153, 0.1);
  color: var(--accent-green);
}

.back-top svg {
  width: 20px;
  height: 20px;
}

body[data-nav-collapsed="true"] .site-header__rail {
  width: var(--rail-collapsed);
  padding-inline: 14px;
}

body[data-nav-collapsed="true"] .site-header__rail-top {
  flex-direction: column;
  justify-content: center;
  padding: 24px 0 12px;
  min-height: 0;
}

body[data-nav-collapsed="true"] .site-brand__text,
body[data-nav-collapsed="true"] .site-nav__label {
  max-width: 0;
  opacity: 0;
}

body[data-nav-collapsed="true"] .site-nav__link {
  gap: 0;
  justify-content: center;
  padding: 12px 0;
}

body[data-nav-collapsed="true"] .rail-toggle {
  display: inline-flex;
}

body[data-nav-collapsed="true"] .rail-toggle svg {
  transform: rotate(180deg);
}

body[data-nav-collapsed="true"] .site-header__foot {
  padding: 12px 0 0;
  align-items: center;
}

body[data-nav-collapsed="true"] .site-header__search {
  justify-content: center;
  width: 46px;
  padding: 12px;
  border-radius: 14px;
}

body[data-nav-collapsed="true"] .site-header__search span {
  display: none;
}

body[data-nav-collapsed="true"] .site-header__status {
  flex-direction: column;
  gap: 6px;
  padding: 0;
}

body[data-nav-collapsed="true"] .status-text,
body[data-nav-collapsed="true"] .status-time {
  display: none;
}

.site-footer {
  position: relative;
  background:
    radial-gradient(120% 100% at 100% 100%, rgba(255, 215, 0, 0.04) 0%, transparent 50%),
    linear-gradient(160deg, var(--bg-warm) 0%, var(--bg-deep) 100%);
  border-top: 1px solid var(--line);
  padding: clamp(40px, 6vw, 72px) clamp(20px, 4vw, 48px) 28px;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-blue) 55%, var(--accent-gold));
  border-radius: 0 0 3px 3px;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(24px, 4vw, 48px);
  max-width: 1280px;
  margin-inline: auto;
}

.site-footer__brand {
  grid-column: span 5;
}

.site-footer__links {
  grid-column: span 3;
}

.site-footer__contact {
  grid-column: span 4;
}

.site-footer__tagline {
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-muted);
  max-width: 44ch;
}

.site-footer__heading {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  font-style: normal;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-warm);
  margin-bottom: 16px;
}

.site-footer__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
  color: var(--text-muted);
}

.site-footer__list a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.25s;
}

.site-footer__list a:hover {
  color: var(--accent-green);
}

.site-footer__bottom {
  max-width: 1280px;
  margin: 44px auto 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--text-muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.25s var(--ease-out), box-shadow 0.25s, background 0.25s, border-color 0.25s, color 0.25s;
}

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

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(51, 255, 153, 0.3);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text-warm);
}

.btn--ghost:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

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

.btn--gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(255, 215, 0, 0.3);
}

.btn--sm {
  padding: 8px 18px;
  font-size: 13px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--line);
}

.breadcrumb__link {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.25s;
}

.breadcrumb__link:hover {
  color: var(--accent-green);
}

.breadcrumb__item[aria-current="page"] {
  color: var(--text-warm);
}

.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);
}

.card {
  background:
    linear-gradient(160deg, rgba(255, 255, 255, 0.04) 0%, transparent 60%),
    var(--bg-warm);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 26px;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s var(--ease-out), border-color 0.3s, box-shadow 0.3s;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(51, 255, 153, 0.35);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

.panel {
  position: relative;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 80% at 100% 0%, rgba(45, 108, 255, 0.08) 0%, transparent 50%),
    linear-gradient(155deg, var(--bg-warm) 0%, var(--bg-deep) 100%);
  border: 1px solid var(--line);
  padding: clamp(24px, 4vw, 48px);
  overflow: hidden;
}

.section {
  padding-block: clamp(48px, 6vw, 88px);
}

.section__title {
  font-size: clamp(28px, 4vw, 44px);
  margin-bottom: 12px;
}

.section__lead {
  font-size: 17px;
  color: var(--text-muted);
  max-width: 60ch;
  margin-bottom: 32px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: rgba(51, 255, 153, 0.12);
  color: var(--accent-green);
  border: 1px solid transparent;
  white-space: nowrap;
}

.badge--gold {
  background: rgba(255, 215, 0, 0.1);
  color: var(--accent-gold);
}

.badge--blue {
  background: rgba(45, 108, 255, 0.12);
  color: var(--accent-blue);
}

.badge--outline {
  background: transparent;
  border-color: var(--line);
  color: var(--text-muted);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-family: var(--font-mono);
  border: 1px solid var(--line);
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.15);
}

.stat {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--text-warm);
}

.stat__label {
  display: block;
  margin-top: 6px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.stat--green {
  color: var(--accent-green);
}

.stat--gold {
  color: var(--accent-gold);
}

.stat--blue {
  color: var(--accent-blue);
}

.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(45, 108, 255, 0.1) 0%, transparent 55%),
    var(--bg-night);
  border: 1px solid var(--line);
}

.media-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.media-frame[data-ratio="wide"]::before {
  padding-top: 42%;
}

.media-frame[data-ratio="square"]::before {
  padding-top: 100%;
}

.media-frame[data-ratio="portrait"]::before {
  padding-top: 140%;
}

.media-frame > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  background: repeating-linear-gradient(45deg, rgba(255, 255, 255, 0.02) 0 2px, transparent 2px 12px);
}

.content-index {
  display: grid;
  gap: 12px;
}

.content-index__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-warm);
  text-decoration: none;
  font-weight: 600;
  transition: border-color 0.25s, background 0.25s, transform 0.25s var(--ease-out);
}

.content-index__link:hover {
  border-color: var(--accent-green);
  background: rgba(51, 255, 153, 0.05);
  transform: translateX(6px);
}

.content-index__num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent-green);
}

blockquote {
  border-left: 3px solid var(--accent-green);
  padding-left: 20px;
  color: var(--text-muted);
  font-style: italic;
  margin: 24px 0;
}

hr {
  border: none;
  height: 1px;
  background: var(--line);
  margin: 32px 0;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
  transition-delay: var(--reveal-delay, 0s);
}

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

@media (min-width: 1025px) {
  .site-header__bar {
    display: none;
  }

  #main-content {
    margin-left: var(--rail-width);
    transition: margin-left 0.35s var(--ease-out);
  }

  body[data-nav-collapsed="true"] #main-content {
    margin-left: var(--rail-collapsed);
  }
}

@media (max-width: 1024px) {
  .site-header__rail,
  body[data-nav-collapsed="true"] .site-header__rail {
    top: var(--header-height-mobile);
    width: min(85vw, 320px);
    padding: 20px;
    transform: translateX(-100%);
    visibility: hidden;
    border-right: 1px solid var(--line);
    box-shadow: none;
    transition: transform 0.35s var(--ease-out), width 0.35s var(--ease-out), visibility 0s linear 0.35s;
  }

  .site-header__rail[data-open] {
    transform: translateX(0);
    visibility: visible;
    box-shadow: 24px 0 80px rgba(0, 0, 0, 0.5);
    transition: transform 0.35s var(--ease-out), width 0.35s var(--ease-out), visibility 0s linear 0s;
  }

  .site-header__rail-top {
    display: none;
  }

  .site-nav__link {
    padding: 14px 16px;
    font-size: 16px;
  }

  .site-header__foot {
    padding: 12px 0 0;
  }

  #main-content {
    padding-top: var(--header-height-mobile);
    margin-left: 0;
  }
}

@media (max-width: 850px) {
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
  }

  .site-footer__brand,
  .site-footer__links,
  .site-footer__contact {
    grid-column: auto;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 560px) {
  .grid--2 {
    grid-template-columns: 1fr;
  }

  .section__title {
    font-size: 28px;
  }

  .back-top {
    right: 16px;
    bottom: 16px;
  }
}

@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: 0s !important;
    scroll-behavior: auto !important;
  }

  .status-pulse,
  .site-progress,
  .back-top {
    animation: none;
  }

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