/* ============ KAIYUN 官方直营平台 Site.css ============ */
/* 赛事控制台 / 侧边导航轨道 / 玻璃层 + 斜切分割 / 电光蓝 x 霓虹紫 / 兼容 reduced-motion */

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

/* ---------- Variables ---------- */
:root {
  --primary-dark: #0A0E14;
  --primary-blue: #00C6FF;
  --primary-purple: #9A5CFF;
  --accent-red: #FF3D5A;
  --deep-teal: #0B3B3F;
  --wine-red: #5C1030;
  --indigo: #3B2A6D;
  --text-light: #E8EDF2;
  --text-muted: #A0AAB5;
  --white: #FFFFFF;
  --glass: rgba(255, 255, 255, 0.08);
  --header-w: 320px;
  --font-headline: 'Impact', 'Source Han Sans CN Heavy', sans-serif;
  --font-body: 'Source Han Sans CN', 'PingFang SC', sans-serif;
  --font-mono: 'Roboto Mono', monospace;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-inout: cubic-bezier(0.65, 0, 0.35, 1);
  --radius: 4px;
  --content-max: 1200px;
  --space: 2rem;
}

/* ---------- Base ---------- */
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background: var(--primary-dark);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 28px;
  color: var(--text-light);
  background: var(--primary-dark);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }

::selection {
  background: var(--primary-blue);
  color: var(--primary-dark);
}

/* ---------- Focus ---------- */
:focus-visible {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}

.skip-link:focus-visible {
  outline: 2px solid var(--white);
  outline-offset: 0;
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 3000;
  padding: 0.75rem 1.5rem;
  background: var(--accent-red);
  color: var(--white);
  font-weight: 700;
  font-size: 14px;
  line-height: 1;
  border-radius: var(--radius);
  transition: top 0.2s var(--ease-out);
}

.skip-link:focus-visible {
  top: 1rem;
}

/* ---------- Scroll Progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: var(--header-w);
  width: calc(100% - var(--header-w));
  height: 3px;
  background: linear-gradient(90deg, var(--primary-blue), var(--primary-purple), var(--accent-red));
  transform: scaleX(0);
  transform-origin: left;
  z-index: 2000;
  pointer-events: none;
  transition: transform 0.1s linear;
}

/* ---------- Header / 侧边轨道 ---------- */
[data-nav] {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--header-w);
  z-index: 1000;
  background: transparent;
  color: var(--text-light);
}

.site-header__inner {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 2rem 1.5rem 1.75rem;
  background-color: var(--primary-dark);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px);
  background-size: 28px 28px;
  border-right: 1px solid rgba(0, 198, 255, 0.12);
  overflow-y: auto;
  overflow-x: hidden;
}

.site-header__inner::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 1px;
  height: 100%;
  background: linear-gradient(to bottom, transparent, rgba(0, 198, 255, 0.35), rgba(154, 92, 255, 0.3), transparent);
  opacity: 0.45;
  pointer-events: none;
}

/* ---------- Brand ---------- */
.brand-block {
  padding-bottom: 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-lockup__glyph {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
  color: var(--primary-dark);
  font-family: var(--font-headline);
  font-size: 26px;
  font-weight: 900;
  line-height: 1;
  transform: skew(-8deg);
  border-radius: 2px;
  flex-shrink: 0;
}

.brand-lockup__name {
  font-family: var(--font-headline);
  font-size: 28px;
  font-weight: 900;
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--white);
  transform: skew(-5deg);
}

.brand-tagline {
  margin-top: 0.875rem;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding-left: 2px;
}

.brand-tagline::before {
  content: '— ';
  color: var(--primary-blue);
}

/* ---------- Nav Meta Layer ---------- */
.nav-layer--meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
  margin-bottom: 0.375rem;
}

.nav-meta__text {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--primary-blue);
  white-space: nowrap;
}

.nav-meta__rule {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(0, 198, 255, 0.35), transparent);
}

/* ---------- Nav List ---------- */
.nav-list__item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.045);
}

.nav-list__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.875rem 0;
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: color 0.25s var(--ease-out), padding-left 0.25s var(--ease-out);
}

.nav-list__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: rgba(255, 255, 255, 0.28);
  letter-spacing: 0.08em;
  min-width: 2ch;
  transition: color 0.25s;
}

.nav-list__label {
  font-size: 15px;
}

.nav-list__link:hover {
  color: var(--primary-blue);
  padding-left: 0.375rem;
}

.nav-list__link:hover .nav-list__num {
  color: var(--primary-blue);
}

.nav-list__link[aria-current="page"] {
  color: var(--white);
  font-weight: 700;
}

.nav-list__link[aria-current="page"]::after {
  content: '';
  position: absolute;
  right: -1.5rem;
  top: 50%;
  transform: translateY(-50%) skewX(-20deg);
  width: 3px;
  height: 55%;
  background: var(--primary-blue);
  box-shadow: 0 0 14px rgba(0, 198, 255, 0.5);
}

/* ---------- Header Actions ---------- */
.header-actions {
  margin-top: auto;
  display: grid;
  gap: 0.75rem;
  padding-top: 2rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.3s var(--ease-out);
}

.btn--primary {
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
  color: var(--primary-dark);
}

.btn--primary:hover {
  box-shadow: 0 0 26px rgba(0, 198, 255, 0.45);
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.18);
  color: var(--text-light);
}

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

.btn--search {
  justify-content: flex-start;
}

.btn--search__icon {
  display: block;
  flex-shrink: 0;
}

.btn--subscribe {
  width: 100%;
}

.btn--large {
  padding: 1rem 2.5rem;
  font-size: 16px;
}

/* ---------- Nav Toggle ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 5px;
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 1200;
  width: 44px;
  height: 44px;
  padding: 0;
  background: rgba(10, 14, 20, 0.92);
  border: 1px solid rgba(0, 198, 255, 0.25);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.25s, background 0.25s;
}

.nav-toggle:hover {
  border-color: var(--primary-blue);
  background: rgba(10, 14, 20, 0.98);
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-light);
  border-radius: 1px;
  transition: transform 0.3s var(--ease-out), opacity 0.3s var(--ease-out);
}

[data-nav][data-open] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

[data-nav][data-open] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

[data-nav][data-open] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  flex-shrink: 0;
  width: 100%;
  padding: 3rem 2rem 1.75rem;
  background-color: #070B10;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  background-size: 28px 28px;
  border-top: 1px solid rgba(0, 198, 255, 0.1);
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary-blue), var(--primary-purple), transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.6fr;
  gap: 2.5rem;
  max-width: var(--content-max);
  margin: 0 auto;
}

.footer-brand__name {
  font-family: var(--font-headline);
  font-size: 28px;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: 0.06em;
  color: var(--white);
  transform: skew(-3deg);
}

.footer-brand__tagline {
  margin-top: 0.375rem;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--primary-blue);
}

.footer-brand__note {
  margin-top: 1rem;
  font-size: 13px;
  line-height: 24px;
  color: var(--text-muted);
  max-width: 32em;
}

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}

.footer-nav__list {
  display: grid;
  gap: 0.625rem;
}

.footer-nav__list a {
  font-size: 14px;
  color: var(--text-muted);
  transition: color 0.2s, padding-left 0.2s;
}

.footer-nav__list a:hover {
  color: var(--primary-blue);
  padding-left: 0.25rem;
}

.footer-contact__item {
  font-size: 13px;
  line-height: 24px;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  max-width: var(--content-max);
  margin: 2.5rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-bottom__copy {
  font-size: 12px;
  color: var(--text-muted);
}

.footer-bottom__icp {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

/* ---------- Site Shell / Main ---------- */
.site-shell {
  margin-left: var(--header-w);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--space);
}

/* ---------- Section ---------- */
.section {
  padding: 4rem 0;
}

.section__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
}

.section__title {
  font-family: var(--font-headline);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  line-height: 1.1;
  font-weight: 900;
  font-style: italic;
  text-transform: uppercase;
  transform: skew(-3deg);
  color: var(--white);
}

.section__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  white-space: nowrap;
}

/* ---------- Page Hero ---------- */
.page-hero {
  position: relative;
  padding: clamp(3rem, 8vw, 6rem) 0 clamp(2rem, 5vw, 4rem);
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -8%;
  width: 55%;
  height: 75%;
  background: radial-gradient(ellipse, rgba(154, 92, 255, 0.16), transparent 70%);
  pointer-events: none;
}

.page-hero::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -10%;
  width: 40%;
  height: 60%;
  background: radial-gradient(ellipse, rgba(0, 198, 255, 0.1), transparent 70%);
  pointer-events: none;
}

.page-hero__title {
  position: relative;
  z-index: 1;
  font-family: var(--font-headline);
  font-size: clamp(2.5rem, 6vw, 4rem);
  line-height: 1.05;
  font-weight: 900;
  font-style: italic;
  text-transform: uppercase;
  transform: skew(-3deg);
  color: var(--white);
  max-width: 12em;
}

.page-hero__lead {
  position: relative;
  z-index: 1;
  margin-top: 1rem;
  max-width: 42em;
  font-size: 16px;
  line-height: 28px;
  color: var(--text-muted);
}

/* ---------- Grid ---------- */
.grid {
  display: grid;
  gap: 2rem;
}

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

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

.grid--gap-lg {
  gap: 2.5rem;
}

/* ---------- Glass Panel ---------- */
.glass-panel {
  background: var(--glass);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  padding: 1.5rem;
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

/* ---------- Media Frame ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--deep-teal), var(--primary-dark));
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
}

.media-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 35%, rgba(0, 198, 255, 0.08) 50%, transparent 65%);
  pointer-events: none;
}

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

.media-frame--tall {
  aspect-ratio: 3 / 4;
}

.media-frame__label {
  position: absolute;
  bottom: 0;
  left: 0;
  z-index: 2;
  padding: 0.25rem 0.75rem;
  background: rgba(10, 14, 20, 0.82);
  color: var(--text-muted);
  font-size: 12px;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

/* ---------- Exhibition Tag ---------- */
.exh-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--primary-blue);
}

.exh-tag::before {
  content: '';
  width: 2rem;
  height: 1px;
  background: var(--primary-blue);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  padding: 1rem 0;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 13px;
  color: var(--text-muted);
}

.breadcrumb__item:not(:last-child)::after {
  content: '/';
  color: rgba(255, 255, 255, 0.2);
}

.breadcrumb__link {
  color: var(--text-muted);
  transition: color 0.2s;
}

.breadcrumb__link:hover {
  color: var(--primary-blue);
}

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

/* ---------- Reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

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

[data-reveal] [data-reveal-child] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

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

[data-reveal].is-revealed [data-reveal-child]:nth-child(2) { transition-delay: 0.08s; }
[data-reveal].is-revealed [data-reveal-child]:nth-child(3) { transition-delay: 0.16s; }
[data-reveal].is-revealed [data-reveal-child]:nth-child(4) { transition-delay: 0.24s; }
[data-reveal].is-revealed [data-reveal-child]:nth-child(5) { transition-delay: 0.32s; }
[data-reveal].is-revealed [data-reveal-child]:nth-child(6) { transition-delay: 0.4s; }

/* ---------- Responsive ---------- */
@media (max-width: 1023px) {
  [data-nav] {
    width: auto;
    inset: 0;
    pointer-events: none;
  }

  [data-nav]::before {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(5, 8, 12, 0.62);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.35s var(--ease-out), visibility 0.35s var(--ease-out);
    pointer-events: none;
  }

  [data-nav][data-open]::before {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .site-header__inner {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(320px, 88vw);
    height: auto;
    padding: 4.75rem 1.5rem 2rem;
    transform: translateX(-100%);
    transition: transform 0.42s var(--ease-out);
    border-right: 1px solid rgba(0, 198, 255, 0.2);
  }

  [data-nav][data-open] .site-header__inner {
    transform: translateX(0);
  }

  [data-nav] .site-header__inner,
  [data-nav] .nav-toggle {
    pointer-events: auto;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .scroll-progress {
    left: 0;
    width: 100%;
  }

  .site-shell {
    margin-left: 0;
  }

  .nav-list__link[aria-current="page"]::after {
    right: -1.5rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 639px) {
  :root {
    --space: 1.25rem;
  }

  .section {
    padding: 2.5rem 0;
  }

  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    margin-top: 1.75rem;
  }

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

/* ---------- 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;
  }

  .scroll-progress {
    transition: none;
  }

  [data-reveal],
  [data-reveal] [data-reveal-child] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn--primary:hover,
  .btn--ghost:hover {
    transform: none;
  }

  .nav-toggle__bar {
    transition: none;
  }
}