/* ==========================================================
   B体育娱乐 Site Kit — 共享样式
   ========================================================== */

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

html {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-body);
  background: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overflow-x: hidden;
}

body.is-nav-open {
  overflow: hidden;
}

h1, h2, h3, h4, h5, h6,
p, ul, ol, dl, dd, figure, blockquote {
  margin: 0;
}

ul, ol {
  padding: 0;
  list-style: none;
}

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

button, input, select, textarea {
  margin: 0;
  padding: 0;
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  -webkit-appearance: none;
  appearance: none;
}

button {
  cursor: pointer;
}

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

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

/* ---------- Variables ---------- */
:root {
  --color-bg-primary: #0B1D33;
  --color-bg-secondary: #12365C;
  --color-bg-card: #1E4E7B;
  --color-accent: #F97316;
  --color-accent-soft: #FFB03A;
  --color-data: #39FF14;
  --color-text-body: #F5F7FA;
  --color-border: #D9E2EC;
  --color-text-muted: #9BB0C8;
  --color-warning: #E11D48;

  --font-heading: 'Noto Sans SC Black', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC Light', system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: ui-monospace, 'SF Mono', 'Cascadia Code', Menlo, Consolas, monospace;

  --header-width: 220px;
  --content-max: 1200px;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 28px;
  --radius-pill: 999px;

  --duration-fast: 0.2s ease;
  --duration-base: 0.35s cubic-bezier(0.4, 0, 0.2, 1);

  --shadow-card: 0 12px 32px rgba(6, 13, 23, 0.35);
  --shadow-orange: 0 6px 18px rgba(249, 115, 22, 0.32);
  --shadow-glow: 0 0 14px rgba(57, 255, 20, 0.45);
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.25;
  color: var(--color-text-body);
}

h1 {
  font-size: clamp(3.2rem, 8vw, 6rem);
}

h2 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
}

h3 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

p {
  font-size: 1rem;
  line-height: 1.7;
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg-primary);
}

/* ---------- Utilities ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.container {
  width: min(100% - clamp(28px, 5vw, 64px), var(--content-max));
  margin-inline: auto;
}

.section {
  padding-block: clamp(56px, 10vw, 120px);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: var(--color-bg-primary);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.2;
  cursor: pointer;
  text-decoration: none;
  box-shadow: 0 4px 14px rgba(249, 115, 22, 0.28);
  transition: transform var(--duration-fast), box-shadow var(--duration-fast), background var(--duration-fast);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-orange);
  color: var(--color-bg-primary);
}

.btn:active {
  transform: translateY(0);
}

.btn--ghost {
  background: rgba(245, 247, 250, 0.08);
  color: var(--color-text-body);
  box-shadow: none;
  border: 1px solid rgba(245, 247, 250, 0.22);
}

.btn--ghost:hover {
  background: rgba(245, 247, 250, 0.14);
  color: var(--color-text-body);
  box-shadow: none;
}

.btn--small {
  padding: 8px 16px;
  font-size: 0.85rem;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  padding: 14px 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.breadcrumb a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--duration-fast);
}

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

.breadcrumb__sep {
  color: rgba(155, 176, 200, 0.5);
}

/* ---------- Grid ---------- */
.grid {
  display: grid;
  gap: 24px;
}

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

@media (min-width: 768px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

/* ---------- Section Heading ---------- */
.section-heading {
  display: grid;
  gap: 6px;
  margin-bottom: 28px;
}

.section-heading__kicker {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.section-heading__title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  line-height: 1.22;
  color: var(--color-text-body);
}

.section-heading__note {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* ---------- Media Frame ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(ellipse at 15% 85%, rgba(249, 115, 22, 0.16), transparent 55%),
    repeating-linear-gradient(135deg, rgba(245, 247, 250, 0.025) 0 2px, transparent 2px 14px),
    linear-gradient(145deg, var(--color-bg-secondary), var(--color-bg-card));
}

.media-frame--16x9::after {
  content: "";
  display: block;
  padding-bottom: 56.25%;
}

.media-frame--4x3::after {
  content: "";
  display: block;
  padding-bottom: 75%;
}

.media-frame--1x1::after {
  content: "";
  display: block;
  padding-bottom: 100%;
}

.media-frame__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

/* ---------- Vertical Note ---------- */
.vertical-note {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-heading);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--color-text-muted);
}

/* ---------- Light Panel ---------- */
.panel {
  border-radius: var(--radius-lg);
  background: var(--color-text-body);
  color: var(--color-bg-secondary);
  padding: 24px;
}

.panel__heading {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--color-bg-primary);
  margin-bottom: 8px;
}

.panel p {
  color: rgba(11, 29, 51, 0.8);
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 400;
  padding: 10px 18px;
  background: var(--color-accent);
  color: var(--color-bg-primary);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  line-height: 1.3;
  border-radius: var(--radius-pill);
  text-decoration: none;
  box-shadow: var(--shadow-orange);
  transform: translateY(-220%);
  transition: transform var(--duration-fast);
}

.skip-link:focus-visible {
  transform: translateY(0);
  color: var(--color-bg-primary);
}

@media (min-width: 1024px) {
  .skip-link {
    left: calc(var(--header-width) + 12px);
  }
}

/* ---------- Brand ---------- */
.brand {
  position: relative;
  z-index: 220;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 12px 12px 12px 4px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-soft));
  color: var(--color-bg-primary);
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 900;
  line-height: 1;
  transform: rotate(-6deg);
  box-shadow: var(--shadow-orange);
  transition: transform var(--duration-fast);
}

.brand:hover .brand__mark {
  transform: rotate(0deg) scale(1.04);
}

.brand__name {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--color-text-body);
  white-space: nowrap;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  background: var(--color-bg-primary);
  border-bottom: 1px solid rgba(217, 226, 236, 0.08);
}

@media (min-width: 1024px) {
  .site-header {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--header-width);
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    gap: 0;
    padding: 0;
    border-bottom: none;
    border-right: 1px solid rgba(217, 226, 236, 0.08);
    background:
      radial-gradient(120% 55% at 85% 6%, rgba(249, 115, 22, 0.10), transparent 60%),
      linear-gradient(180deg, var(--color-bg-primary) 0%, #081627 100%);
  }

  .site-header::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-soft) 55%, transparent 100%);
    clip-path: polygon(0 0, 100% 0, calc(100% - 18px) 100%, 0 100%);
  }

  .site-header .brand {
    margin: 28px 22px 0;
  }
}

/* ---------- Nav Toggle ---------- */
.nav-toggle {
  position: relative;
  z-index: 220;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: var(--radius-pill);
  background: var(--color-bg-secondary);
  transition: background var(--duration-fast);
}

.nav-toggle:hover {
  background: var(--color-bg-card);
}

.nav-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-text-body);
  transition: transform var(--duration-base), opacity var(--duration-fast);
}

.nav-toggle.is-active .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-active .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-active .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (min-width: 1024px) {
  .nav-toggle {
    display: none;
  }
}

/* ---------- Live Indicator ---------- */
.site-header__live {
  display: none;
}

@media (min-width: 1024px) {
  .site-header__live {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 18px 22px 0;
    padding: 0 4px 18px;
    border-bottom: 1px solid rgba(217, 226, 236, 0.08);
  }
}

.site-header__live-dot {
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-data);
  box-shadow: var(--shadow-glow);
  animation: live-pulse 2s ease-in-out infinite;
}

.site-header__live-text {
  font-family: var(--font-heading);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  white-space: nowrap;
  color: var(--color-text-muted);
}

@keyframes live-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.55); }
  70%  { box-shadow: 0 0 0 7px rgba(57, 255, 20, 0); }
  100% { box-shadow: 0 0 0 0 rgba(57, 255, 20, 0); }
}

/* ---------- Site Nav ---------- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  display: flex;
  flex-direction: column;
  width: min(300px, 86vw);
  height: 100vh;
  height: 100dvh;
  padding: 96px 24px 24px;
  background: var(--color-bg-primary);
  border-right: 1px solid rgba(217, 226, 236, 0.1);
  transform: translateX(-104%);
  visibility: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  transition: transform var(--duration-base), visibility 0s linear 0.35s;
}

.site-nav[data-open="true"] {
  transform: translateX(0);
  visibility: visible;
  transition: transform var(--duration-base), visibility 0s linear 0s;
}

.site-nav__header {
  padding: 0 8px 14px;
  border-bottom: 1px solid rgba(217, 226, 236, 0.08);
}

.site-nav__kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.site-nav__kicker::before {
  content: "";
  width: 18px;
  height: 4px;
  flex-shrink: 0;
  border-radius: 2px;
  background: var(--color-accent);
  clip-path: polygon(0 0, 100% 0, 82% 100%, 0 100%);
}

.site-nav__list {
  display: grid;
  gap: 6px;
  margin-top: 14px;
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-pill);
  color: var(--color-text-muted);
  font-weight: 400;
  font-size: 0.95rem;
  line-height: 1.35;
  transition: background var(--duration-fast), color var(--duration-fast), transform var(--duration-fast);
}

.site-nav__link:hover {
  color: var(--color-text-body);
  background: rgba(30, 78, 123, 0.45);
  transform: translateX(3px);
}

.site-nav__link[aria-current="page"] {
  background: var(--color-accent);
  color: var(--color-bg-primary);
  font-weight: 700;
  box-shadow: var(--shadow-orange);
}

.site-nav__index {
  min-width: 18px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  opacity: 0.65;
}

.site-nav__link[aria-current="page"] .site-nav__index {
  opacity: 1;
}

.site-nav__label {
  font-size: 0.95rem;
  white-space: nowrap;
}

.site-nav__progress {
  margin-top: auto;
  padding-top: 28px;
}

.site-nav__progress-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.site-nav__track {
  position: relative;
  height: 6px;
  border-radius: var(--radius-pill);
  background: rgba(155, 176, 200, 0.18);
  overflow: hidden;
}

.site-nav__track::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: repeating-linear-gradient(
    90deg,
    rgba(155, 176, 200, 0.28) 0,
    rgba(155, 176, 200, 0.28) 1px,
    transparent 1px,
    transparent 12px
  );
}

.site-nav__track-bar {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-soft));
  transform: scaleX(0);
  transform-origin: left center;
}

@media (min-width: 1024px) {
  .site-nav,
  .site-nav[data-open="true"] {
    position: static;
    width: auto;
    height: auto;
    padding: 20px 14px 18px;
    border-right: none;
    background: transparent;
    transform: none;
    visibility: visible;
    z-index: auto;
    transition: none;
    flex: 1;
    min-height: 0;
  }

  .site-nav__header {
    padding: 0 8px 12px;
    border-bottom: none;
  }
}

/* ---------- Header Backdrop ---------- */
.site-header__backdrop {
  position: fixed;
  inset: 0;
  z-index: 150;
  background: rgba(4, 10, 18, 0.72);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-fast);
}

.site-header__backdrop[data-open="true"] {
  opacity: 1;
  pointer-events: auto;
}

@media (min-width: 1024px) {
  .site-header__backdrop {
    display: none;
  }
}

/* ---------- Main Layout ---------- */
.site-main {
  position: relative;
  min-height: 70vh;
  overflow: hidden;
  background: var(--color-bg-primary);
}

@media (min-width: 1024px) {
  .site-main,
  .site-footer {
    margin-left: var(--header-width);
  }
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  background: var(--color-bg-primary);
  color: var(--color-text-body);
  overflow: hidden;
}

.site-footer__flag {
  height: 10px;
  background-color: var(--color-text-body);
  background-image:
    linear-gradient(45deg, var(--color-bg-primary) 25%, transparent 25%, transparent 75%, var(--color-bg-primary) 75%),
    linear-gradient(45deg, var(--color-bg-primary) 25%, transparent 25%, transparent 75%, var(--color-bg-primary) 75%);
  background-size: 14px 14px;
  background-position: 0 0, 7px 7px;
  opacity: 0.85;
}

.site-footer__grid {
  display: grid;
  gap: 32px;
  padding: 48px 0 36px;
}

.site-footer__brand-col {
  display: grid;
  gap: 16px;
  align-content: start;
}

.brand--footer .brand__name {
  font-size: 1.3rem;
}

.site-footer__desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.75;
  max-width: 46ch;
}

.site-footer__col {
  display: grid;
  gap: 4px;
  align-content: start;
}

.site-footer__heading {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-text-body);
  padding-bottom: 10px;
  margin-bottom: 18px;
  border-bottom: 2px solid var(--color-accent);
}

.site-footer__list {
  display: grid;
  gap: 10px;
}

.site-footer__item a {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  transition: color var(--duration-fast), padding-left var(--duration-fast);
}

.site-footer__item a:hover {
  color: var(--color-accent);
  padding-left: 6px;
}

.site-footer__contact {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 8px;
  word-break: break-all;
}

.site-footer__actions {
  margin-top: 16px;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 20px 0 28px;
  border-top: 1px solid rgba(217, 226, 236, 0.1);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
}

.site-footer__legal a {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  transition: color var(--duration-fast);
}

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

.site-footer__sep {
  color: rgba(155, 176, 200, 0.4);
  font-size: 0.85rem;
}

.site-footer__copy {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

@media (min-width: 768px) {
  .site-footer__grid {
    grid-template-columns: 1.3fr 0.8fr 1fr;
    gap: 48px;
  }
}

/* ---------- Focus ---------- */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-data);
  outline-offset: 2px;
}

/* ---------- 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;
    transition-delay: 0s !important;
  }

  .site-nav,
  .site-nav[data-open="true"] {
    transition: transform 0.01ms linear, visibility 0s linear 0s;
  }
}