/* ==========================================================
   K1竞界 / battle-k1.com.cn 共享 Site CSS
   深夜球场 · 数据霓虹
   ========================================================== */

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

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

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: #0B0F1A;
  background-image:
    radial-gradient(ellipse at 20% 0%, rgba(0, 200, 255, 0.06) 0%, transparent 55%),
    radial-gradient(ellipse at 100% 100%, rgba(255, 165, 0, 0.03) 0%, transparent 45%);
  background-attachment: fixed;
  color: rgba(255, 255, 255, 0.92);
  font-family: "Noto Sans SC", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

ul, ol {
  list-style: none;
}

a {
  color: #00C8FF;
  text-decoration: none;
  transition: color 250ms cubic-bezier(0.22, 1, 0.36, 1);
}

a:hover {
  color: #66E0FF;
}

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

::selection {
  background: rgba(0, 200, 255, 0.25);
  color: #FFFFFF;
}

:focus-visible {
  outline: 2px solid #00C8FF;
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- CSS Variables ---------- */
:root {
  --color-bg: #0B0F1A;
  --color-electric: #00C8FF;
  --color-orange: #FFA500;
  --color-silver: #C0C0C0;
  --color-darkgray: #212633;
  --color-bluebright: #66E0FF;
  --color-glass: rgba(255, 255, 255, 0.08);
  --color-red: #FF3B30;
  --color-yellow: #FFD700;
  --color-white: #FFFFFF;
  --color-border: rgba(192, 192, 192, 0.18);
  --text-primary: rgba(255, 255, 255, 0.92);
  --text-secondary: rgba(255, 255, 255, 0.68);
  --text-muted: rgba(255, 255, 255, 0.42);
  --font-title: "Noto Sans SC", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
  --font-num: "Roboto Mono", "JetBrains Mono", "SFMono-Regular", "Menlo", "Consolas", monospace;
  --header-height: 72px;
  --container: 1280px;
  --container-pad: clamp(20px, 4vw, 48px);
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 20px rgba(0, 200, 255, 0.12);
  --transition-main: 250ms cubic-bezier(0.22, 1, 0.36, 1);
  --skew: skewX(-10deg);
}

/* ---------- Base Layout ---------- */
#main-content {
  display: block;
  flex: 1 0 auto;
  padding-top: var(--header-height);
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

.section {
  padding: clamp(64px, 10vw, 120px) 0;
  position: relative;
}

.section__header {
  margin-bottom: 40px;
  max-width: 720px;
}

.section__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-electric);
  margin-bottom: 12px;
}

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

.section__title {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1.2;
  color: var(--text-primary);
  letter-spacing: 0.02em;
  transform: var(--skew);
  transform-origin: left center;
  margin-bottom: 8px;
}

.section__subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 520px;
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 2000;
  background: var(--color-electric);
  color: var(--color-bg);
  font-weight: 700;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  transition: top 200ms ease;
}

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

/* ---------- Scroll Progress ---------- */
.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-electric), var(--color-orange));
  transform-origin: 0 50%;
  transform: scaleX(0);
  z-index: 10;
  pointer-events: none;
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(11, 15, 26, 0.72);
  -webkit-backdrop-filter: blur(18px) saturate(1.2);
  backdrop-filter: blur(18px) saturate(1.2);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-main);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 15%;
  right: 15%;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(0, 200, 255, 0.35), transparent);
  filter: blur(1px);
  pointer-events: none;
}

.site-header__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-header__left {
  display: flex;
  align-items: center;
  gap: 20px;
  min-width: 0;
}

.site-header__right {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ---------- Brand ---------- */
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--text-primary);
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.5rem;
  line-height: 1.2;
  transform: var(--skew);
  white-space: nowrap;
  transition: opacity var(--transition-main);
}

.site-brand:hover {
  color: var(--text-primary);
  opacity: 0.85;
}

.site-brand__logo {
  color: var(--color-electric);
  text-shadow: 0 0 18px rgba(0, 200, 255, 0.35);
}

.site-brand__name {
  color: var(--text-primary);
  letter-spacing: 0.08em;
}

.site-brand__badge {
  font-size: 0.55rem;
  font-weight: 700;
  font-family: var(--font-body);
  color: var(--color-bg);
  background: var(--color-orange);
  border-radius: var(--radius-pill);
  padding: 2px 8px;
  transform: skewX(10deg);
  letter-spacing: 0.12em;
  box-shadow: 0 0 12px rgba(255, 165, 0, 0.25);
}

.site-brand--footer {
  font-size: 1.75rem;
  margin-bottom: 12px;
}

/* ---------- Status ---------- */
.site-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--color-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  white-space: nowrap;
}

.site-status__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-electric);
  box-shadow: 0 0 8px rgba(0, 200, 255, 0.6);
  animation: status-pulse 2s ease-in-out infinite;
}

@keyframes status-pulse {
  0%, 100% {
    opacity: 1;
    box-shadow: 0 0 8px rgba(0, 200, 255, 0.6);
  }
  50% {
    opacity: 0.5;
    box-shadow: 0 0 3px rgba(0, 200, 255, 0.2);
  }
}

.site-status__text {
  font-size: 0.72rem;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
}

/* ---------- Navigation ---------- */
.site-nav {
  display: flex;
  align-items: center;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px;
  background: var(--color-glass);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
}

.site-nav__item {
  flex-shrink: 0;
}

.site-nav__link {
  display: block;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  white-space: nowrap;
  transition: background var(--transition-main), color var(--transition-main), box-shadow var(--transition-main);
}

.site-nav__link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.07);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-bg);
  background: var(--color-electric);
  box-shadow: 0 2px 14px rgba(0, 200, 255, 0.35);
  font-weight: 700;
}

/* ---------- Nav Toggle ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 11px 10px;
  border-radius: var(--radius-pill);
  background: var(--color-glass);
  border: 1px solid var(--color-border);
}

.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-main), opacity var(--transition-main);
}

.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 {
  margin-top: auto;
  position: relative;
  background: linear-gradient(180deg, transparent 0%, rgba(11, 15, 26, 0.7) 20%);
  border-top: 1px solid var(--color-border);
  padding-top: clamp(48px, 6vw, 80px);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--color-electric) 0%, transparent 30%, transparent 70%, var(--color-orange) 100%);
  opacity: 0.5;
}

.site-footer__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 56px;
}

.site-footer__tagline {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-electric);
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.site-footer__trust {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.8;
  max-width: 340px;
}

.site-footer__heading {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-silver);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.site-footer__heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 24px;
  height: 2px;
  background: var(--color-electric);
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-link {
  color: var(--text-secondary);
  font-size: 0.85rem;
  padding: 4px 0;
  display: inline-block;
  transition: color var(--transition-main), padding-left var(--transition-main);
}

.footer-link:hover {
  color: var(--color-electric);
  padding-left: 6px;
}

.site-footer__contact-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.site-footer__contact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-footer__label {
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.site-footer__value {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.site-footer__bottom {
  border-top: 1px solid var(--color-border);
  padding: 18px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 24px;
}

.site-footer__icp {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.site-footer__copyright {
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.88rem;
  letter-spacing: 0.06em;
  line-height: 1.4;
  cursor: pointer;
  transform: skewX(-6deg);
  transition: background var(--transition-main), color var(--transition-main), border-color var(--transition-main), box-shadow var(--transition-main);
}

.btn > * {
  transform: skewX(6deg);
}

.btn--primary {
  background: var(--color-electric);
  color: var(--color-bg);
  font-weight: 700;
  box-shadow: 0 4px 22px rgba(0, 200, 255, 0.25);
}

.btn--primary:hover {
  background: var(--color-bluebright);
  color: var(--color-bg);
  box-shadow: 0 6px 30px rgba(16, 220, 255, 0.4);
}

.btn--ghost {
  background: var(--color-glass);
  border-color: var(--color-border);
  color: var(--text-primary);
}

.btn--ghost:hover {
  border-color: var(--color-electric);
  color: var(--color-electric);
  background: rgba(0, 200, 255, 0.1);
}

/* ---------- Cards ---------- */
.card {
  background: var(--color-darkgray);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-main), box-shadow var(--transition-main), border-color var(--transition-main);
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 200, 255, 0.35);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.data-card {
  position: relative;
  overflow: hidden;
  background: var(--color-darkgray);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-main), box-shadow var(--transition-main), border-color var(--transition-main);
}

.data-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-electric), transparent);
  opacity: 0.7;
}

.data-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 200, 255, 0.35);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.data-card__number {
  font-family: var(--font-num);
  font-weight: 500;
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--color-electric);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.data-card__label {
  font-size: 0.78rem;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
  margin-top: 4px;
}

/* ---------- Media Frames ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-darkgray), var(--color-bg));
  aspect-ratio: 16 / 10;
}

.media-frame--dark {
  background: linear-gradient(135deg, #141927, var(--color-bg));
}

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

/* ---------- Data Table ---------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  font-variant-numeric: tabular-nums;
}

.data-table th {
  text-align: left;
  font-family: var(--font-num);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-border);
}

.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
}

.data-table tr:hover td {
  background: rgba(0, 200, 255, 0.04);
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  padding: 24px 0 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.breadcrumbs__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumbs__item:not(:last-child)::after {
  content: "/";
  color: var(--text-muted);
  font-size: 0.72rem;
}

.breadcrumbs__link {
  color: var(--text-secondary);
}

.breadcrumbs__link:hover {
  color: var(--color-electric);
}

.breadcrumbs__current {
  color: var(--color-silver);
}

/* ---------- Scroll Reveal ---------- */
[data-reveal] {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: no-preference) {
  [data-reveal] {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
    transition-delay: var(--reveal-delay, 0ms);
    will-change: opacity, transform;
  }

  [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: calc(var(--header-height) + 8px);
    left: var(--container-pad);
    right: var(--container-pad);
    background: rgba(11, 15, 26, 0.96);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-14px) scale(0.98);
    transition: opacity var(--transition-main), transform var(--transition-main), visibility var(--transition-main);
    z-index: 999;
  }

  .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 0;
    background: none;
    border: none;
    border-radius: 0;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }

  .site-nav__link {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
  }

  .site-nav__link[aria-current="page"] {
    background: var(--color-glass);
    color: var(--color-electric);
    box-shadow: none;
  }
}

@media (max-width: 1024px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 640px) {
  :root {
    --header-height: 62px;
  }

  .site-header__left {
    gap: 10px;
  }

  .site-status {
    padding: 5px 8px;
  }

  .site-status__text {
    display: none;
  }

  .site-brand {
    font-size: 1.2rem;
  }

  .site-brand__badge {
    font-size: 0.5rem;
    padding: 1px 6px;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-bottom: 40px;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 6px;
  }

  .site-footer__trust {
    max-width: none;
  }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .site-status__dot {
    animation: none;
  }

  .scroll-progress {
    transition: none;
  }
}