/* ==========================================
   易倍体育 · 数据竞技场 Site Kit
   /assets/site.css
   ========================================== */

/* ---------- Design Tokens ---------- */
:root {
  --color-bg: #0A192F;
  --color-bg-deep: #060D1A;
  --color-card: #1E2A38;
  --color-accent: #00FFAA;
  --color-accent-alt: #FF6B35;
  --color-text: #F5F5F5;
  --color-text-dim: rgba(245, 245, 245, 0.62);
  --color-glass: rgba(255, 255, 255, 0.08);
  --color-data: #E0E0FF;
  --color-warning: #FFD166;

  --font-headline: "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", sans-serif;
  --font-data: "JetBrains Mono", monospace;

  --h1: clamp(2.5rem, 6vw, 4.5rem);
  --h2: clamp(2rem, 4vw, 3rem);
  --h3: clamp(1.5rem, 3vw, 2rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  --container-max: 1200px;
  --container-pad: clamp(1rem, 4vw, 2rem);
  --header-height: 64px;

  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 18px;

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  height: 100%;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-height) + 1rem);
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body[data-lock-scroll] {
  overflow: hidden;
}

#main-content {
  flex: 1;
  width: 100%;
}

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

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

ul, ol {
  list-style: none;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  color: var(--color-accent);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headline);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin: 0 0 0.5em;
}

h1 { font-size: var(--h1); }
h2 { font-size: var(--h2); }
h3 { font-size: var(--h3); }

p {
  margin: 0 0 1em;
}

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

/* ---------- Layout Primitives ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.section--compact {
  padding-block: clamp(2rem, 4vw, 3rem);
}

.section__header {
  max-width: 760px;
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.section__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.section__eyebrow::before {
  content: '//';
  color: var(--color-accent-alt);
  font-weight: 700;
}

.grid {
  display: grid;
  gap: var(--space-8);
}

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

@media (min-width: 640px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 639px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }
}

/* ---------- Accessibility Helpers ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: -80px;
  left: 1rem;
  z-index: 2000;
  padding: 0.625rem 1.25rem;
  background: var(--color-accent);
  color: var(--color-bg);
  font-family: var(--font-body);
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: top 0.25s ease;
}

.skip-link:focus {
  top: 1rem;
  color: var(--color-bg);
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(10, 25, 47, 0.55);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: background-color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.site-header.is-scrolled {
  background-color: rgba(10, 25, 47, 0.97);
  border-bottom-color: rgba(0, 255, 170, 0.22);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
}

.header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--container-max);
  margin-inline: auto;
  padding: 0.625rem clamp(1rem, 4vw, 2rem);
  min-height: var(--header-height);
}

.header__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-alt));
  z-index: 5;
  pointer-events: none;
}

/* ---------- Brand ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
  flex-shrink: 0;
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--color-accent);
  color: var(--color-bg);
}

.brand__mark svg {
  width: 20px;
  height: 20px;
}

.brand__text {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 1.25rem;
  letter-spacing: -0.03em;
  color: var(--color-text);
  white-space: nowrap;
}

.brand--footer .brand__mark {
  width: 42px;
  height: 42px;
  background: transparent;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
}

.brand--footer .brand__mark svg {
  width: 22px;
  height: 22px;
}

.brand--footer .brand__text {
  font-size: 1.5rem;
}

/* ---------- Navigation ---------- */
.nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex: 1;
  gap: clamp(1rem, 2vw, 2rem);
}

.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 1.6vw, 1.5rem);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__item {
  margin: 0;
}

.nav__link {
  position: relative;
  display: inline-block;
  padding: 0.5rem 0.25rem;
  color: rgba(245, 245, 245, 0.78);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.25s ease;
}

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

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

.nav__link[aria-current="page"]::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--color-accent);
  transform: skewX(-30deg);
}

.nav__cta.btn {
  margin-left: 0.25rem;
  padding: 0.5rem 1.125rem;
  font-size: 0.875rem;
  white-space: nowrap;
}

.nav__cta.btn--primary:hover {
  transform: none;
  box-shadow: 0 0 18px rgba(0, 255, 170, 0.4);
}

/* ---------- Nav Toggle ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 8px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 10px;
  cursor: pointer;
  flex-shrink: 0;
}

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

.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);
}

/* ---------- Mobile Navigation ---------- */
@media (max-width: 1023px) {
  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    padding: 1.5rem clamp(1rem, 4vw, 2rem) 2rem;
    background: rgba(6, 13, 26, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 255, 170, 0.25);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
    z-index: 1001;
  }

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

  .nav__list {
    flex-direction: column;
    gap: 0;
    margin-bottom: 1.5rem;
  }

  .nav__item {
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .nav__link {
    display: block;
    width: 100%;
    padding: 0.875rem 0;
    font-size: 1.125rem;
    color: rgba(245, 245, 245, 0.82);
  }

  .nav__link:hover {
    padding-left: 0.5rem;
    color: var(--color-accent);
  }

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

  .nav__link[aria-current="page"]::after {
    content: none;
  }

  .nav__cta.btn {
    width: 100%;
    justify-content: center;
    margin-left: 0;
  }

  .header__inner {
    justify-content: space-between;
  }

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

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.2;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

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

.btn--primary:hover {
  background: rgba(0, 255, 170, 0.85);
  color: var(--color-bg);
  box-shadow: 0 0 24px rgba(0, 255, 170, 0.35);
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: rgba(255, 255, 255, 0.25);
}

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

/* ---------- Cards ---------- */
.card {
  background: var(--color-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 3vw, 2rem);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
  border-color: rgba(0, 255, 170, 0.3);
}

.card__title {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 1.25rem;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.card__meta {
  display: block;
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.card__body {
  color: var(--color-text-dim);
  line-height: 1.7;
}

.card__footer {
  margin-top: 1.5rem;
}

/* ---------- Tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.625rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  border: 1px solid transparent;
}

.tag--live {
  background: var(--color-accent);
  color: var(--color-bg);
}

.tag--live::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  animation: tag-pulse 1.6s ease-in-out infinite;
}

.tag--hot {
  background: rgba(255, 107, 53, 0.15);
  border-color: rgba(255, 107, 53, 0.4);
  color: var(--color-accent-alt);
}

.tag--muted {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text-dim);
}

@keyframes tag-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.75); }
}

/* ---------- Data Typography ---------- */
.data-group {
  display: flex;
  align-items: baseline;
  gap: 0.375rem;
  font-family: var(--font-data);
}

.data-label {
  font-size: 0.75rem;
  color: var(--color-text-dim);
  letter-spacing: 0.05em;
}

.data-value {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-data);
}

.data-value--accent {
  color: var(--color-accent);
}

.data-value--alt {
  color: var(--color-accent-alt);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  padding: 0 0 1.5rem;
  font-family: var(--font-body);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-dim);
  font-size: 0.875rem;
}

.breadcrumb__item:not(:last-child)::after {
  content: '/';
  color: var(--color-accent);
  font-family: var(--font-data);
}

.breadcrumb__link {
  color: var(--color-text-dim);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.breadcrumb__item[aria-current="page"] {
  color: var(--color-accent);
  font-weight: 600;
}

/* ---------- Page Typography ---------- */
.page-title {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: var(--h1);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.page-intro {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  color: var(--color-text-dim);
  line-height: 1.75;
  max-width: 65ch;
}

.prose {
  max-width: 75ch;
  color: var(--color-text-dim);
  line-height: 1.8;
  font-size: 1rem;
}

.prose p {
  margin-bottom: 1.25em;
}

.prose h2,
.prose h3 {
  font-family: var(--font-headline);
  font-weight: 900;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

/* ---------- Visual Frame ---------- */
.visual-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(145deg, var(--color-card) 0%, var(--color-bg) 100%);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
}

.visual-frame--wide {
  aspect-ratio: 16 / 9;
}

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

.visual-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, transparent 30%, rgba(0, 255, 170, 0.08) 30%, rgba(0, 255, 170, 0.08) 40%, transparent 40%),
    linear-gradient(45deg, transparent 55%, rgba(255, 107, 53, 0.05) 55%, rgba(255, 107, 53, 0.05) 65%, transparent 65%);
  pointer-events: none;
}

.visual-frame__inner {
  position: relative;
  z-index: 1;
  color: var(--color-text-dim);
  font-family: var(--font-data);
  font-size: 0.875rem;
  text-align: center;
  padding: 1rem;
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--color-bg-deep);
  margin-top: auto;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent 10%, var(--color-accent) 30%, var(--color-accent-alt) 52%, var(--color-accent) 72%, transparent 90%);
  z-index: 2;
}

.footer__watermark {
  position: absolute;
  right: -2%;
  bottom: -2rem;
  z-index: 0;
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: clamp(6rem, 18vw, 16rem);
  line-height: 1;
  color: rgba(255, 255, 255, 0.025);
  white-space: nowrap;
  letter-spacing: -0.04em;
  pointer-events: none;
}

.footer__inner {
  position: relative;
  z-index: 1;
  max-width: var(--container-max);
  margin-inline: auto;
  padding: clamp(2.5rem, 5vw, 4rem) clamp(1rem, 4vw, 2rem) clamp(1.5rem, 3vw, 2.5rem);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  margin-bottom: 2.5rem;
}

@media (min-width: 600px) {
  .footer__grid {
    grid-template-columns: repeat(6, 1fr);
  }
  .footer__brand-col { grid-column: span 6; }
  .footer__nav-col,
  .footer__legal-col,
  .footer__contact-col { grid-column: span 2; }
}

@media (min-width: 1024px) {
  .footer__grid {
    grid-template-columns: repeat(12, 1fr);
  }
  .footer__brand-col { grid-column: span 4; }
  .footer__nav-col { grid-column: span 3; }
  .footer__legal-col { grid-column: span 2; }
  .footer__contact-col { grid-column: span 3; }
}

.footer__about {
  color: var(--color-text-dim);
  font-size: 0.9375rem;
  line-height: 1.75;
  max-width: 38ch;
  margin-top: 1rem;
}

.footer__heading {
  font-family: var(--font-data);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
}

.footer__heading::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 1px;
  width: 36px;
  background: var(--color-accent);
}

.footer__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer__list li {
  margin-bottom: 0.25rem;
}

.footer__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  padding: 0.25rem 0;
  color: rgba(245, 245, 245, 0.65);
  font-size: 0.9375rem;
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer__link::before {
  content: '';
  width: 0;
  height: 2px;
  background: var(--color-accent);
  margin-right: 0;
  transition: width 0.2s ease, margin-right 0.2s ease;
}

.footer__link:hover {
  color: var(--color-accent);
  padding-left: 0.25rem;
}

.footer__link:hover::before {
  width: 6px;
  margin-right: 6px;
}

.footer__contact-line {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  color: rgba(245, 245, 245, 0.6);
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: 0.75rem;
  word-break: break-all;
}

.footer__contact-label {
  color: var(--color-text);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (min-width: 768px) {
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.footer__meta {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer__icp {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-text-dim);
}

.footer__icp::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 10px rgba(0, 255, 170, 0.5);
  flex-shrink: 0;
}

.footer__trust {
  font-size: 0.8rem;
  color: rgba(245, 245, 245, 0.4);
  line-height: 1.6;
  max-width: 62ch;
}

.footer__copyright {
  font-family: var(--font-data);
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  white-space: nowrap;
}

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

[data-reveal].is-visible {
  opacity: 1;
  transform: 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;
    scroll-behavior: auto !important;
  }

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