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

:root {
  --clr-primary-orange: #FF6B35;
  --clr-primary-blue: #005A9E;
  --clr-warm-paper: #F5F0E8;
  --clr-deep-ink: #1A1A2E;
  --clr-pure-white: #FFFFFF;
  --clr-cool-gray: #4A4A4A;
  --clr-light-gray-bg: #F0F0F0;
  --clr-accent-green: #00C853;
  --clr-dark-border: #2D2D3D;
  --clr-subtle-shadow: rgba(0, 0, 0, 0.15);

  --font-heading: 'Inter', sans-serif;
  --font-body: 'Roboto', sans-serif;
  --heading-weight: 800;
  --border-thick: 4px;
  --shadow-heavy: 8px 8px 0 var(--clr-subtle-shadow);
  --nav-width: 280px;
  --transition-default: 0.2s ease;
}

html {
  scroll-behavior: smooth;
  font-size: 100%;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  background-color: var(--clr-warm-paper);
  color: var(--clr-deep-ink);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--heading-weight);
  font-style: italic;
  line-height: 1.1;
  text-transform: uppercase;
  color: var(--clr-deep-ink);
}

a {
  color: var(--clr-primary-blue);
  text-decoration: none;
  transition: color var(--transition-default), border-color var(--transition-default), background var(--transition-default);
}

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

a:focus-visible {
  outline: 3px solid var(--clr-primary-orange);
  outline-offset: 4px;
}

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

ul {
  list-style: none;
}

.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 10000;
  padding: 0.5rem 1.5rem;
  background: var(--clr-deep-ink);
  color: var(--clr-pure-white);
  font-weight: 700;
  transition: top var(--transition-default);
}

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

/* Progress Indicator */
.progress-indicator {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 4px;
  background: var(--clr-primary-orange);
  z-index: 9999;
  transition: width 0.1s linear;
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
  .progress-indicator {
    display: none;
  }
}

/* ========================
   Brand Rail (Sidebar)
   ======================== */
.brand-rail {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--nav-width);
  height: 100vh;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  padding: 2rem 1.5rem;
  background: transparent;
  border-right: var(--border-thick) solid var(--clr-dark-border);
  transition: background var(--transition-default), box-shadow var(--transition-default);
}

body.has-scrolled .brand-rail {
  background: var(--clr-warm-paper);
  box-shadow: 6px 0 12px var(--clr-subtle-shadow);
}

.brand-rail-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2.5rem;
}

.brand-logo {
  font-family: var(--font-heading);
  font-weight: var(--heading-weight);
  font-style: italic;
  font-size: 1.5rem;
  color: var(--clr-deep-ink);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  line-height: 1;
}

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

.nav-toggle {
  display: none;
  background: none;
  border: 2px solid var(--clr-dark-border);
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  color: var(--clr-deep-ink);
  font-size: 1.25rem;
  transition: all var(--transition-default);
}

.nav-toggle-icon {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--clr-deep-ink);
  position: relative;
  transition: background var(--transition-default);
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--clr-deep-ink);
  position: absolute;
  left: 0;
  transition: transform var(--transition-default);
}

.nav-toggle-icon::before { top: -8px; }
.nav-toggle-icon::after { top: 8px; }

.nav-toggle.active .nav-toggle-icon { background: transparent; }
.nav-toggle.active .nav-toggle-icon::before { transform: rotate(45deg); top: 0; }
.nav-toggle.active .nav-toggle-icon::after { transform: rotate(-45deg); top: 0; }

.brand-rail-content {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav-list a {
  display: block;
  padding: 0.6rem 0.8rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--clr-deep-ink);
  border-left: 3px solid transparent;
  transition: all var(--transition-default);
}

.nav-list a:hover,
.nav-list a:focus-visible {
  border-left-color: var(--clr-primary-orange);
  color: var(--clr-primary-orange);
  background: rgba(255, 107, 53, 0.08);
}

.nav-list a[aria-current="page"] {
  border-left-color: var(--clr-primary-orange);
  color: var(--clr-primary-orange);
  font-weight: 800;
  background: rgba(255, 107, 53, 0.12);
}

.brand-rail-search {
  margin-top: auto;
  padding-top: 1.5rem;
}

.search-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 3px solid var(--clr-dark-border);
  background: var(--clr-pure-white);
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--clr-deep-ink);
  transition: border-color var(--transition-default);
}

.search-input::placeholder {
  color: var(--clr-cool-gray);
  opacity: 0.7;
}

.search-input:focus {
  border-color: var(--clr-primary-orange);
  outline: none;
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.25);
}

/* ========================
   Main Canvas
   ======================== */
.main-canvas {
  margin-left: var(--nav-width);
  min-height: 100vh;
}

/* ========================
   Shared Components
   ======================== */

/* Frame Viewport (框景首屏) */
.frame-viewport {
  position: relative;
  border: var(--border-thick) solid var(--clr-dark-border);
  box-shadow: var(--shadow-heavy);
  padding: 2rem;
  background: var(--clr-pure-white);
}

.frame-viewport::before {
  content: '';
  position: absolute;
  top: -12px;
  left: 24px;
  width: 48px;
  height: var(--border-thick);
  background: var(--clr-primary-orange);
  pointer-events: none;
}

.frame-viewport::after {
  content: '';
  position: absolute;
  inset: 0;
  box-shadow: inset 0 0 0 2px rgba(255, 107, 53, 0.25);
  pointer-events: none;
}

/* Sports Card */
.sports-card {
  background: var(--clr-pure-white);
  border: 3px solid var(--clr-dark-border);
  padding: 1.5rem;
  transition: transform var(--transition-default), box-shadow var(--transition-default);
  box-shadow: 4px 4px 0 var(--clr-subtle-shadow);
}

.sports-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--clr-subtle-shadow);
}

.sports-card:focus-within {
  border-color: var(--clr-primary-orange);
}

/* Data Chip */
.data-chip {
  display: inline-block;
  padding: 0.2rem 1rem;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 0.85rem;
  border: 2px solid var(--clr-dark-border);
  background: var(--clr-primary-orange);
  color: var(--clr-pure-white);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  line-height: 1.4;
}

.data-chip.blue {
  background: var(--clr-primary-blue);
}

.data-chip.outline {
  background: transparent;
  color: var(--clr-deep-ink);
}

/* Image Container (for page-level images) */
.image-container {
  position: relative;
  overflow: hidden;
  background: var(--clr-light-gray-bg);
  border: 3px solid var(--clr-dark-border);
  aspect-ratio: 16 / 9;
}

.image-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ========================
   Buttons (Generic)
   ======================== */
.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 3px solid var(--clr-dark-border);
  background: var(--clr-primary-orange);
  color: var(--clr-pure-white);
  box-shadow: 4px 4px 0 var(--clr-subtle-shadow);
  cursor: pointer;
  transition: all var(--transition-default);
  text-align: center;
}

.btn:hover {
  background: var(--clr-deep-ink);
  color: var(--clr-pure-white);
  border-color: var(--clr-deep-ink);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--clr-subtle-shadow);
}

.btn:focus-visible {
  outline-offset: 2px;
}

.btn-outline {
  background: transparent;
  color: var(--clr-deep-ink);
}

.btn-outline:hover {
  background: var(--clr-primary-orange);
  color: var(--clr-pure-white);
  border-color: var(--clr-primary-orange);
}

/* ========================
   Footer
   ======================== */
.site-footer {
  background: var(--clr-deep-ink);
  color: var(--clr-warm-paper);
  border-top: 6px solid var(--clr-primary-orange);
  padding: 3rem 2rem 1.5rem;
  margin-left: var(--nav-width);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr 1.5fr;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-logo {
  font-family: var(--font-heading);
  font-weight: var(--heading-weight);
  font-style: italic;
  font-size: 1.5rem;
  color: var(--clr-pure-white);
  text-transform: uppercase;
}

.footer-tagline {
  margin-top: 0.5rem;
  color: var(--clr-cool-gray);
  font-size: 0.9rem;
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-nav a {
  color: var(--clr-warm-paper);
  font-weight: 600;
  border-bottom: 2px solid transparent;
}

.footer-nav a:hover {
  color: var(--clr-primary-orange);
  border-bottom-color: var(--clr-primary-orange);
}

.footer-contact p {
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
  line-height: 1.5;
}

.footer-contact strong {
  color: var(--clr-primary-orange);
  font-weight: 700;
}

.footer-bottom {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--clr-cool-gray);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--clr-cool-gray);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

/* ========================
   Responsive
   ======================== */

/* Tablet & Small Desktop */
@media (max-width: 1024px) {
  :root {
    --nav-width: 240px;
  }
  .brand-rail {
    padding: 1.5rem 1rem;
  }
  .nav-list a {
    font-size: 0.9rem;
    padding: 0.5rem 0.6rem;
  }
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --nav-width: 0px;
  }

  .brand-rail {
    width: 100%;
    height: auto;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    padding: 0.8rem 1.5rem;
    border-right: none;
    border-bottom: var(--border-thick) solid var(--clr-dark-border);
    background: var(--clr-warm-paper);
    box-shadow: 0 4px 8px var(--clr-subtle-shadow);
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
  }

  .brand-rail-header {
    margin-bottom: 0;
    width: auto;
    flex: 1;
  }

  .nav-toggle {
    display: block;
  }

  .brand-rail-content {
    display: none;
    width: 100%;
    padding-top: 1rem;
    flex-direction: column;
  }

  .brand-rail[data-open] .brand-rail-content {
    display: flex;
  }

  .nav-list {
    flex-direction: column;
    gap: 0.15rem;
  }

  .nav-list a {
    font-size: 1rem;
    padding: 0.6rem 0.8rem;
    border-left: 3px solid transparent;
  }

  .brand-rail-search {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--clr-dark-border);
  }

  .main-canvas {
    margin-left: 0;
    padding-top: 5rem;
  }

  .site-footer {
    margin-left: 0;
    padding: 2rem 1.5rem 1rem;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .frame-viewport {
    padding: 1rem;
  }
}

/* Small Mobile */
@media (max-width: 480px) {
  .brand-rail {
    padding: 0.6rem 1rem;
  }
  .brand-logo {
    font-size: 1.2rem;
  }
}