/* =========================================================
   Perfect Sports — Shared Site CSS
   Design Language: Coordinate Index / Data Map
   ========================================================= */

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

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

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  line-height: 1.75;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
  background-color: var(--color-primary-bg);
  background-image:
    linear-gradient(to right, rgba(0, 191, 255, 0.028) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 191, 255, 0.028) 1px, transparent 1px);
  background-size: 36px 36px;
  overflow-x: hidden;
}

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

ul,
ol {
  list-style: none;
}

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

a:hover {
  color: var(--color-text-primary);
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  border: none;
  background: none;
  cursor: pointer;
}

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

/* ---------- Design Tokens ---------- */
:root {
  --color-primary-bg: #0D1117;
  --color-card-bg: #161C24;
  --color-accent-blue: #00BFFF;
  --color-accent-orange: #FF8C00;
  --color-accent-gold: #FFD700;
  --color-text-primary: #F8FAFC;
  --color-text-secondary: #8FA3B8;
  --color-border: #2A3D56;
  --color-error: #FF4D4F;
  --color-overlay-blue: rgba(0, 191, 255, 0.1);

  --font-headline: "Impact", "Arial Black", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Courier New", monospace;

  --font-size-display: clamp(2.5rem, 8vw, 6rem);
  --font-size-display-sm: clamp(1.8rem, 5vw, 3rem);
  --font-size-h1: clamp(1.6rem, 4vw, 2.5rem);
  --font-size-h2: clamp(1.2rem, 2vw, 1.8rem);
  --font-size-h3: clamp(1rem, 1.5vw, 1.4rem);
  --font-size-body: 1rem;
  --font-size-data: clamp(1.2rem, 2.5vw, 2rem);

  --content-width: 1200px;
  --content-padding: 20px;
  --header-top-height: 72px;
  --nav-bar-height: 54px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 32px;
  --space-xl: 64px;
  --space-2xl: 96px;

  --bevel: 10px;
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ---------- Shared Layout ---------- */
.container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding-left: var(--content-padding);
  padding-right: var(--content-padding);
}

.main-content {
  min-height: 65vh;
}

.section {
  padding-top: var(--space-2xl);
  padding-bottom: var(--space-2xl);
}

.divider {
  height: 1px;
  border: none;
  background: linear-gradient(90deg, var(--color-accent-blue), var(--color-border) 40%, transparent);
  margin: var(--space-xl) 0;
}

/* ---------- Grids ---------- */
.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 24px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  clip-path: polygon(
    var(--bevel) 0,
    100% 0,
    100% calc(100% - var(--bevel)),
    calc(100% - var(--bevel)) 100%,
    0 100%,
    0 var(--bevel)
  );
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:hover {
  border-color: var(--color-accent-blue);
  color: var(--color-accent-blue);
  box-shadow: 0 0 16px rgba(0, 191, 255, 0.12);
}

.btn-cta {
  background: linear-gradient(135deg, var(--color-accent-orange) 0%, #E86600 100%);
  border-color: transparent;
  color: #fff;
  font-weight: 800;
}

.btn-cta:hover {
  background: linear-gradient(135deg, var(--color-accent-blue) 0%, var(--color-accent-orange) 100%);
  color: #fff;
  box-shadow: 0 0 24px rgba(255, 140, 0, 0.25);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent-blue);
  border-color: rgba(0, 191, 255, 0.5);
}

.btn-outline:hover {
  background: var(--color-overlay-blue);
  color: var(--color-text-primary);
  border-color: var(--color-accent-blue);
}

.btn-sm {
  min-height: 38px;
  padding: 0 16px;
  font-size: 0.8125rem;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border);
}

.header-top {
  background-color: rgba(13, 17, 23, 0.85);
  border-bottom: 1px solid rgba(42, 61, 86, 0.5);
}

.header-top-inner {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  min-height: var(--header-top-height);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex: 1;
  min-width: 0;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text-primary);
}

.brand-logo:hover {
  color: var(--color-text-primary);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-accent-blue), var(--color-accent-orange));
  font-family: var(--font-headline);
  font-style: italic;
  font-weight: 900;
  font-size: 1.1rem;
  line-height: 1;
  color: var(--color-primary-bg);
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
}

.brand-text {
  font-family: var(--font-headline);
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.brand-slogan {
  position: relative;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.4;
  color: var(--color-text-secondary);
  letter-spacing: 0.1em;
  white-space: nowrap;
  border-left: 2px solid var(--color-accent-orange);
  padding: 2px 0 2px var(--space-sm);
  transform: skew(-3deg);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-left: auto;
}

.header-nav-bar {
  position: relative;
  background-color: rgba(22, 28, 36, 0.88);
  border-bottom: 1px solid var(--color-border);
}

.header-nav-bar::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, var(--color-accent-blue) 0%, transparent 30%, var(--color-border) 70%, var(--color-accent-orange) 100%);
}

.header-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  min-height: var(--nav-bar-height);
}

.site-nav {
  flex: 1;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-list a {
  position: relative;
  display: inline-block;
  padding: 14px 12px;
  color: var(--color-text-primary);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.nav-list a::after {
  content: '';
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 6px;
  height: 2px;
  background: var(--color-accent-orange);
  transform: skew(-30deg) scaleX(0);
  transform-origin: left center;
  transition: transform var(--transition-medium);
}

.nav-list a:hover {
  color: var(--color-accent-blue);
}

.nav-list a:hover::after,
.nav-list a[aria-current="page"]::after {
  transform: skew(-30deg) scaleX(1);
}

.nav-list a[aria-current="page"] {
  color: var(--color-accent-blue);
}

.nav-coordinate {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--color-text-secondary);
  white-space: nowrap;
  border: 1px solid var(--color-border);
  padding: 4px 12px;
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
  background: var(--color-overlay-blue);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--color-border);
  margin-left: auto;
  transition: border-color var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--color-accent-blue);
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  background-color: var(--color-card-bg);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-2xl);
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-orange) 50%, var(--color-accent-gold));
  opacity: 0.9;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  padding-top: var(--space-xl);
  padding-bottom: var(--space-lg);
}

.footer-block {
  min-width: 0;
}

.footer-brand-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.footer-brand-row .brand-text {
  color: var(--color-text-primary);
}

.footer-about {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.footer-trust {
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
  line-height: 1.7;
  border-left: 2px solid var(--color-border);
  padding-left: var(--space-md);
}

.footer-title {
  font-family: var(--font-headline);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  transform: skew(-3deg);
}

.footer-title::before {
  content: '// ';
  color: var(--color-accent-orange);
}

.footer-links li + li,
.footer-contact li + li {
  margin-top: 8px;
}

.footer-links a {
  display: inline-block;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-accent-blue);
  transform: translateX(4px);
}

.footer-contact {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.footer-note {
  color: var(--color-text-secondary);
  font-size: 0.8125rem;
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.footer-icp {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.05em;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  background-color: rgba(13, 17, 23, 0.5);
  padding-top: var(--space-md);
  padding-bottom: var(--space-md);
}

.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.footer-bottom-mark {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-gold);
}

/* ---------- Cards ---------- */
.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  padding: var(--space-lg);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
  border-color: var(--color-accent-blue);
  box-shadow: 0 0 24px rgba(0, 191, 255, 0.08);
}

.card-bevel {
  clip-path: polygon(
    16px 0,
    100% 0,
    100% calc(100% - 16px),
    calc(100% - 16px) 100%,
    0 100%,
    0 16px
  );
}

/* ---------- Section Header ---------- */
.section-header {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-md);
  border-left: 3px solid var(--color-accent-orange);
}

.coordinate-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent-gold);
  margin-bottom: var(--space-xs);
}

.section-title {
  font-family: var(--font-headline);
  font-size: var(--font-size-h2);
  line-height: 1.2;
  text-transform: uppercase;
  transform: skew(-3deg);
  color: var(--color-text-primary);
}

.section-desc {
  max-width: 60ch;
  margin-top: var(--space-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---------- Data & Typography ---------- */
.data-figure {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums slashed-zero;
  font-feature-settings: "tnum", "zero";
  font-size: var(--font-size-data);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-accent-gold);
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  padding: var(--space-md) 0;
}

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

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

.breadcrumbs .bc-sep {
  color: var(--color-border);
  font-family: var(--font-mono);
}

/* ---------- Image Frame ---------- */
.image-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  aspect-ratio: 16 / 10;
  clip-path: polygon(
    14px 0,
    100% 0,
    100% calc(100% - 14px),
    calc(100% - 14px) 100%,
    0 100%,
    0 14px
  );
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.image-frame:hover img {
  transform: scale(1.04);
}

.image-frame.is-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

/* ---------- Tabs ---------- */
[data-tabs] .tab-list {
  display: flex;
  gap: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-lg);
  overflow-x: auto;
}

[data-tabs] .tab-trigger {
  padding: 10px 20px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  background: transparent;
  border-bottom: 2px solid transparent;
  transform: skew(-3deg);
  white-space: nowrap;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

[data-tabs] .tab-trigger:hover {
  color: var(--color-accent-blue);
}

[data-tabs] .tab-trigger[aria-selected="true"] {
  color: var(--color-text-primary);
  border-bottom-color: var(--color-accent-orange);
}

[data-tabs] .tab-panel {
  display: none;
}

[data-tabs] .tab-panel.is-active {
  display: block;
}

/* ---------- Accessibility & Utility ---------- */
.sr-only {
  position: absolute !important;
  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: 8px;
  left: 8px;
  z-index: 2000;
  padding: 10px 18px;
  background: var(--color-accent-blue);
  color: var(--color-primary-bg);
  font-weight: 700;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transform: translateY(-200%);
  transition: transform var(--transition-medium);
}

.skip-link:focus {
  transform: translateY(0);
  color: var(--color-primary-bg);
  outline: none;
}

/* ---------- Scroll Progress ---------- */
[data-scroll-progress] {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-orange));
  z-index: 2000;
  pointer-events: none;
}

/* ---------- Reveal on Scroll ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.35s ease, transform 0.35s ease;
}

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

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .brand-slogan {
    display: none;
  }

  .header-top-inner {
    min-height: 64px;
  }

  .nav-coordinate {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-card-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
    padding: var(--space-md);
    z-index: 1100;
  }

  .site-nav[data-open] {
    display: block;
  }

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

  .nav-list a {
    display: block;
    padding: var(--space-md);
    border-left: 3px solid transparent;
  }

  .nav-list a::after {
    display: none;
  }

  .nav-list a[aria-current="page"] {
    border-left-color: var(--color-accent-orange);
    color: var(--color-accent-blue);
  }

  .footer-grid {
    gap: var(--space-lg);
  }
}

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

@media (max-width: 480px) {
  .header-actions .btn {
    display: none;
  }

  .brand-text {
    font-size: 1.15rem;
  }

  .nav-toggle {
    width: 40px;
    height: 40px;
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1.2fr 1fr;
  }
}

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

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

  [data-scroll-progress] {
    transition: none;
  }
}