:root {
  --color-race-red: #E4002B;
  --color-deep-red: #B30020;
  --color-gray-deep: #1A1A1A;
  --color-neon: #39FF14;
  --color-white: #FFFFFF;
  --color-light-gray: #F5F5F5;
  --color-medium-gray: #999999;
  --font-display: Impact, "Arial Narrow", Haettenschweiler, "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-mono: "Roboto Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;
  --container-max: 1280px;
  --header-height: 76px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  background: var(--color-gray-deep);
  color: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

::selection {
  background: var(--color-race-red);
  color: var(--color-white);
}

.container {
  width: min(100% - 2rem, var(--container-max));
  margin-inline: auto;
}

.section {
  padding: clamp(4rem, 10vw, 7rem) 0;
}

.section-dark {
  background: var(--color-gray-deep);
  color: var(--color-white);
}

.section-light {
  background: var(--color-light-gray);
  color: var(--color-gray-deep);
}

.section-white {
  background: var(--color-white);
  color: var(--color-gray-deep);
}

.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: 960px) {
  .grid-3, .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--color-race-red);
}

.kicker::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--color-race-red);
}

.display-title {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 5.5rem);
  font-weight: 700;
  line-height: .92;
  letter-spacing: .01em;
  text-transform: uppercase;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.6vw, 3rem);
  font-weight: 700;
  line-height: 1;
}

.section-lead {
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-medium-gray);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px 32px;
  margin-bottom: 48px;
}

.chapter {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 32px;
  align-items: start;
}

.chapter-num {
  font-family: var(--font-mono);
  font-size: clamp(4rem, 9vw, 7.5rem);
  font-weight: 500;
  line-height: .8;
  color: transparent;
  -webkit-text-stroke: 2px var(--color-race-red);
  opacity: .92;
}

.chapter-body {
  padding-top: 12px;
}

.data-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--color-medium-gray);
}

.data-value {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--color-gray-deep);
}

.prose {
  max-width: 72ch;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(26,26,26,.75);
}

.prose h1, .prose h2, .prose h3 {
  font-family: var(--font-display);
  color: var(--color-gray-deep);
  line-height: 1.1;
  margin: 2em 0 .6em;
}

.prose p {
  margin-bottom: 1.1em;
}

.prose a {
  color: var(--color-race-red);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .6rem;
  padding: .85rem 1.6rem;
  font-weight: 700;
  font-size: .9rem;
  letter-spacing: .06em;
  line-height: 1;
  transition: background .25s, color .25s, box-shadow .25s, transform .2s;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-race-red), var(--color-deep-red));
  color: var(--color-white);
  box-shadow: 0 6px 20px rgba(228,0,43,.3);
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-deep-red), #8a0018);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(228,0,43,.42);
}

.btn-ghost {
  border: 2px solid rgba(255,255,255,.35);
  color: var(--color-white);
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.btn-ghost:hover {
  border-color: var(--color-white);
  background: rgba(255,255,255,.08);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  background: var(--color-light-gray);
  color: var(--color-gray-deep);
}

.tag-live {
  background: var(--color-gray-deep);
  color: var(--color-neon);
  border: 1px solid var(--color-neon);
}

.tag-live::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-neon);
}

.card {
  position: relative;
  background: var(--color-white);
  color: var(--color-gray-deep);
  box-shadow: 0 1px 0 rgba(26,26,26,.06);
  border: 1px solid rgba(26,26,26,.08);
}

.card-hover {
  transition: transform .25s, box-shadow .25s;
}

.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0,0,0,.1);
}

.card-body {
  padding: 24px;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 8px;
}

.card-text {
  font-size: 14px;
  line-height: 1.6;
  color: #666;
}

.card-media {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-light-gray);
}

.card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform .6s cubic-bezier(.16,1,.3,1);
}

.card-hover:hover .card-media img {
  transform: scale(1.06);
}

.card-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(26,26,26,.3));
  opacity: .6;
  pointer-events: none;
}

.media-slant {
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -100px;
  z-index: 200;
  padding: 12px 20px;
  background: var(--color-neon);
  color: var(--color-gray-deep);
  font-weight: 700;
  transition: top .2s;
}

.skip-link:focus {
  top: 16px;
}

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  z-index: 130;
  background: linear-gradient(90deg, var(--color-neon) 0%, var(--color-race-red) 70%, var(--color-deep-red) 100%);
  box-shadow: 0 0 10px rgba(57,255,20,.35);
  pointer-events: none;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: linear-gradient(180deg, rgba(26,26,26,.78) 0%, rgba(26,26,26,.08) 100%);
  transition: background .35s, box-shadow .35s;
}

.site-header.is-scrolled {
  background: var(--color-gray-deep);
  border-bottom: 1px solid rgba(228,0,43,.55);
  box-shadow: 0 12px 40px rgba(0,0,0,.28);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  height: 100%;
}

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

.brand-mark {
  width: 44px;
  height: 44px;
  flex: none;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .04em;
  white-space: nowrap;
  color: var(--color-white);
}

.brand-cn {
  margin-left: .15em;
  color: var(--color-race-red);
  font-size: .72em;
  vertical-align: super;
}

.brand-sub {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .22em;
  color: var(--color-medium-gray);
}

.brand-live {
  width: 8px;
  height: 8px;
  background: var(--color-neon);
  animation: pulse-live 1.8s ease-in-out infinite;
}

@keyframes pulse-live {
  0%, 100% { opacity: 1; }
  50% { opacity: .2; }
}

.header-actions {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 32px);
}

.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2vw, 34px);
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 2px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .08em;
  color: rgba(255,255,255,.8);
  transition: color .2s;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-race-red), var(--color-deep-red));
  transform: skewX(-24deg) scaleX(0);
  transform-origin: left;
  transition: transform .25s cubic-bezier(.65,.05,.36,1);
}

.nav-link:hover {
  color: var(--color-white);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  transform: skewX(-24deg) scaleX(1);
}

.nav-link[aria-current="page"] {
  color: var(--color-white);
}

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

.header-cta {
  display: inline-flex;
  padding: .6rem 1.2rem;
  font-size: .85rem;
}

.drawer-cta {
  display: none;
}

.nav-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  z-index: 120;
}

.nav-toggle-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  display: block;
  width: 22px;
  height: 14px;
  transform: translate(-50%, -50%);
}

.nav-toggle-icon span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  transition: top .3s, transform .3s, opacity .3s;
}

.nav-toggle-icon span:nth-child(1) { top: 0; }
.nav-toggle-icon span:nth-child(2) { top: 6px; }
.nav-toggle-icon span:nth-child(3) { top: 12px; }

.site-header.nav-open .nav-toggle-icon span:nth-child(1) {
  top: 6px;
  transform: rotate(45deg);
}

.site-header.nav-open .nav-toggle-icon span:nth-child(2) {
  opacity: 0;
}

.site-header.nav-open .nav-toggle-icon span:nth-child(3) {
  top: 6px;
  transform: rotate(-45deg);
}

.nav-backdrop {
  display: none;
}

@media (max-width: 960px) {
  .site-header {
    --header-height: 64px;
    height: var(--header-height);
  }

  .nav-toggle {
    display: block;
  }

  .header-cta {
    display: none;
  }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(360px, 85vw);
    padding: 92px 32px 32px;
    background: var(--color-gray-deep);
    border-left: 4px solid var(--color-race-red);
    box-shadow: -24px 0 64px rgba(0,0,0,.4);
    transform: translateX(102%);
    visibility: hidden;
    transition: transform .4s cubic-bezier(.65,.05,.36,1), visibility .4s;
    overflow-y: auto;
    z-index: 110;
  }

  .site-nav[data-open] {
    transform: none;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 8px;
    font-size: 16px;
    border-bottom: 1px solid rgba(255,255,255,.08);
    color: rgba(255,255,255,.88);
  }

  .nav-link::after {
    display: none;
  }

  .nav-link:hover {
    background: rgba(255,255,255,.04);
  }

  .nav-link[aria-current="page"] {
    color: var(--color-white);
    background: linear-gradient(90deg, rgba(228,0,43,.28), transparent);
  }

  .drawer-cta {
    display: flex;
    width: 100%;
    margin-top: 28px;
  }

  .nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(10,10,10,.55);
    opacity: 0;
    visibility: hidden;
    transition: opacity .3s, visibility .3s;
    backdrop-filter: blur(2px);
    z-index: 105;
  }

  .site-header.nav-open .nav-backdrop {
    opacity: 1;
    visibility: visible;
  }
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  font-size: 13px;
  color: var(--color-medium-gray);
}

.breadcrumbs a {
  color: rgba(255,255,255,.7);
  transition: color .2s;
}

.breadcrumbs a:hover {
  color: var(--color-white);
}

.breadcrumbs .sep {
  font-family: var(--font-mono);
  color: var(--color-race-red);
}

.breadcrumbs [aria-current="page"] {
  color: var(--color-white);
}

.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--color-gray-deep);
  color: rgba(255,255,255,.75);
}

.site-footer::before {
  content: "365";
  position: absolute;
  right: -20px;
  bottom: 12%;
  z-index: 0;
  font-family: var(--font-display);
  font-size: clamp(180px, 24vw, 320px);
  line-height: .8;
  color: rgba(255,255,255,.025);
  pointer-events: none;
  user-select: none;
}

.footer-checker {
  height: 10px;
  background: repeating-conic-gradient(from 0deg, var(--color-race-red) 0deg 90deg, #111 90deg 180deg);
  background-size: 16px 16px;
  border-bottom: 2px solid var(--color-neon);
}

.footer-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
  gap: 40px 48px;
  padding: 64px 0 48px;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer-brand .brand-mark {
  width: 52px;
  height: 52px;
}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--color-white);
}

.footer-tagline {
  max-width: 34ch;
  margin-bottom: 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-medium-gray);
}

.footer-trust {
  max-width: 40ch;
  padding-left: 12px;
  border-left: 3px solid var(--color-race-red);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255,255,255,.55);
}

.footer-col {
  display: flex;
  flex-direction: column;
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--color-neon);
}

.footer-heading::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--color-race-red);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  position: relative;
  display: inline-block;
  padding-left: 18px;
  font-size: 14px;
  color: rgba(255,255,255,.72);
  transition: color .2s;
}

.footer-links a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 8px;
  height: 8px;
  background: var(--color-race-red);
  transform: translateY(-50%);
  transition: background .2s, transform .2s;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--color-white);
}

.footer-links a:hover::before,
.footer-links a:focus-visible::before {
  background: var(--color-neon);
  transform: translateY(-50%) scale(1.25);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.contact-label {
  width: 4em;
  flex: none;
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--color-medium-gray);
}

.footer-mono {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  word-break: break-all;
  color: rgba(255,255,255,.8);
}

.contact-address {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255,255,255,.68);
}

.footer-bottom {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 22px 0 28px;
  border-top: 1px solid rgba(255,255,255,.1);
  font-size: 13px;
  color: rgba(255,255,255,.5);
}

.footer-icp {
  font-family: var(--font-mono);
  font-size: .9em;
  color: rgba(255,255,255,.45);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-legal a {
  color: rgba(255,255,255,.5);
  transition: color .2s;
}

.footer-legal a:hover,
.footer-legal a:focus-visible {
  color: var(--color-neon);
}

.back-top {
  position: fixed;
  right: clamp(16px, 3vw, 32px);
  bottom: clamp(16px, 3vw, 32px);
  z-index: 95;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  font-size: 1.25rem;
  background: linear-gradient(135deg, var(--color-race-red), var(--color-deep-red));
  color: var(--color-white);
  box-shadow: 0 8px 24px rgba(228,0,43,.35);
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity .3s, transform .3s, visibility .3s, background .3s, color .3s;
}

.back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.back-top:hover {
  background: var(--color-neon);
  color: var(--color-gray-deep);
  box-shadow: 0 8px 24px rgba(57,255,20,.35);
}

html.has-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .6s cubic-bezier(.16,1,.3,1), transform .6s cubic-bezier(.16,1,.3,1);
}

html.has-reveal [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

@media (max-width: 960px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

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

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

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

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

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