/* =========================================================
   BALLBET / 贝博BALLBET中文官网 · Shared Site Kit
   /assets/site.css
   ========================================================= */

:root {
  --color-deep: #0A1128;
  --color-ink: #101A3A;
  --color-teal: #0E4C5C;
  --color-wine: #5E1A2B;
  --color-indigo: #33245C;
  --color-orange: #FF6B2C;
  --color-gold: #E5A83A;
  --color-paper: #F5F2E9;
  --color-mist: #B8CCE8;
  --color-slate: #8A94A8;
  --color-green: #3CD68A;

  --line-muted: rgba(255, 255, 255, 0.06);
  --line: rgba(255, 255, 255, 0.14);
  --line-strong: rgba(255, 255, 255, 0.28);

  --font-display: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --header-h: 72px;
  --container-w: 1280px;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--color-deep);
  color: var(--color-paper);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-display);
  line-height: 1.25;
  color: var(--color-paper);
}

h1 { letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); font-weight: 700; }
h3 { font-size: clamp(1.125rem, 1.5vw, 1.5rem); font-weight: 600; }
h4 { font-size: 1rem; font-weight: 600; }

p, ul, ol, figure, blockquote, dl, dd {
  margin: 0;
}

p + p {
  margin-top: 1em;
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

a {
  color: var(--color-gold);
  text-decoration: none;
  transition: color 200ms var(--ease);
}

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

::selection {
  background: var(--color-orange);
  color: var(--color-deep);
}

:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: 3px;
  border-radius: 0;
}

/* ---------- Base Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 3rem);
}

.display-title {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-paper);
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: clamp(1rem, 4vw, 3rem);
  z-index: 300;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  background: var(--color-orange);
  color: var(--color-deep);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: top 200ms var(--ease);
}

.skip-link:focus-visible {
  top: 12px;
  outline: 2px solid var(--color-paper);
  outline-offset: 2px;
}

/* ---------- Header ---------- */
.site-header {
  --header-h: 72px;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 240ms var(--ease), border-color 240ms var(--ease);
}

.site-header.is-scrolled {
  --header-h: 60px;
  background: rgba(10, 17, 40, 0.94);
  border-bottom-color: var(--line);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.75rem);
  min-height: var(--header-h);
  transition: min-height 240ms var(--ease);
}

.header-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 0%;
  height: 2px;
  z-index: 2;
  pointer-events: none;
  background: linear-gradient(90deg, var(--color-orange), var(--color-gold));
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  min-height: var(--header-h);
  flex-shrink: 0;
  color: var(--color-paper);
}

.site-brand:hover {
  color: var(--color-paper);
}

.site-brand__mark {
  width: 30px;
  height: 20px;
  flex: 0 0 auto;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background:
    linear-gradient(var(--color-gold), var(--color-gold)) 0 2px / 20px 2px no-repeat,
    linear-gradient(var(--color-orange), var(--color-orange)) 0 9px / 30px 2px no-repeat,
    linear-gradient(var(--color-paper), var(--color-paper)) 0 16px / 23px 2px no-repeat;
}

.site-brand__text {
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--color-paper);
  white-space: nowrap;
}

.site-brand__tag {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  color: var(--color-gold);
  border: 1px solid rgba(229, 168, 58, 0.4);
  padding: 2px 6px;
  white-space: nowrap;
}

.header-meta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--color-mist);
  white-space: nowrap;
}

.header-meta__dot {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--color-orange);
}

.header-meta__label {
  opacity: 0.85;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0 2px 0 10px;
}

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  width: 20px;
  flex: 0 0 auto;
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-paper);
  transition: transform 240ms var(--ease), background 240ms var(--ease);
}

.nav-toggle__bar + .nav-toggle__bar {
  margin-top: 5px;
}

.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--color-mist);
}

.nav-toggle:hover .nav-toggle__bar {
  background: var(--color-orange);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:first-child {
  transform: translateY(4px) rotate(45deg);
  background: var(--color-orange);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:last-child {
  transform: translateY(-4px) rotate(-45deg);
  background: var(--color-orange);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 0.125rem;
}

.site-nav__item {
  margin: 0;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.375rem;
  min-height: 44px;
  padding: 0.375rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--color-mist);
  transition: color 200ms var(--ease);
}

.site-nav__index {
  font-size: 0.625rem;
  color: var(--color-slate);
  transition: color 200ms var(--ease);
}

.site-nav__label {
  white-space: nowrap;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0.5rem;
  right: 0.5rem;
  bottom: 2px;
  height: 2px;
  background: var(--color-orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 240ms var(--ease);
}

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

.site-nav__link:hover .site-nav__index {
  color: var(--color-orange);
}

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

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

.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

/* ---------- Mobile Header ---------- */
@media (max-width: 1023px) {
  .site-header,
  .site-header.is-scrolled {
    --header-h: 64px;
  }

  .header-meta {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    z-index: 99;
    background: rgba(10, 17, 40, 0.98);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-10px);
    transition:
      opacity 240ms var(--ease),
      transform 240ms var(--ease),
      visibility 0s linear 240ms;
  }

  .site-nav[data-open] {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
    transition:
      opacity 240ms var(--ease),
      transform 240ms var(--ease);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem 0 1rem;
  }

  .site-nav__item {
    border-bottom: 1px solid var(--line-muted);
  }

  .site-nav__item:last-child {
    border-bottom: 0;
  }

  .site-nav__link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 48px;
    padding: 0.5rem clamp(1.25rem, 4vw, 3rem);
  }

  .site-nav__link::after {
    display: none;
  }

  .site-nav__link[aria-current="page"] {
    background: rgba(255, 107, 44, 0.1);
  }
}

@media (max-width: 560px) {
  .nav-toggle__label {
    display: none;
  }
}

@media (max-width: 420px) {
  .site-brand__tag {
    display: none;
  }
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-ink);
  color: var(--color-mist);
  border-top: 1px solid var(--line);
}

.footer-accent {
  height: 10px;
  background: linear-gradient(90deg, var(--color-orange) 0%, var(--color-gold) 55%, rgba(229, 168, 58, 0.1) 100%);
  clip-path: polygon(0 15%, 100% 0, 100% 45%, 0 100%);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.9fr 1.15fr;
  gap: clamp(2rem, 5vw, 4rem);
  padding: clamp(3rem, 7vw, 5rem) 0;
}

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

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

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

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

.footer-block + .footer-block {
  border-left: 1px solid var(--line-muted);
  padding-left: clamp(1.5rem, 3vw, 2.5rem);
}

.footer-brand__logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--color-paper);
}

.footer-brand__logo::before {
  content: "";
  width: 24px;
  height: 2px;
  align-self: center;
  background: var(--color-orange);
  box-shadow: 8px 6px 0 var(--color-gold);
}

.footer-brand__wordmark {
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--color-gold);
}

.footer-brand__desc {
  margin-top: 1rem;
  max-width: 42ch;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-mist);
}

.footer-heading {
  margin-bottom: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.footer-heading::before {
  content: "// ";
  color: var(--color-orange);
}

.footer-nav__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.25rem 1rem;
}

.footer-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.375rem 0 0.375rem 0.875rem;
  font-size: 0.9375rem;
  color: var(--color-mist);
  transition: color 200ms var(--ease);
}

.footer-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 1px;
  background: var(--color-orange);
  transition: width 200ms var(--ease);
}

.footer-link:hover {
  color: var(--color-paper);
}

.footer-link:hover::before {
  width: 10px;
}

.footer-contact__list {
  display: grid;
  gap: 0.75rem;
}

.footer-contact__item {
  display: grid;
  gap: 0.125rem;
}

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-slate);
}

.footer-contact__value {
  font-size: 0.9375rem;
  color: var(--color-paper);
  overflow-wrap: anywhere;
}

.footer-contact__note {
  margin-top: 1rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--color-orange);
  font-size: 0.8125rem;
  color: var(--color-slate);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  column-gap: 1.75rem;
  row-gap: 0.375rem;
  padding: 1.125rem 0 1.375rem;
  border-top: 1px solid var(--line-muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--color-slate);
}

.footer-bottom__copy {
  color: var(--color-mist);
}

.footer-bottom__icp {
  color: var(--color-mist);
}

.footer-bottom__domain {
  margin-left: auto;
  color: var(--color-gold);
}

/* ---------- Footer Responsive ---------- */
@media (max-width: 920px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-block--brand {
    grid-column: 1 / -1;
  }

  .footer-block + .footer-block {
    border-left: 0;
    padding-left: 0;
  }

  .footer-block--nav {
    border-left: 1px solid var(--line-muted);
    padding-left: clamp(1.25rem, 3vw, 2rem);
  }
}

@media (max-width: 560px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-block--brand {
    grid-column: auto;
  }

  .footer-block--nav {
    border-left: 0;
    padding-left: 0;
  }

  .footer-bottom__domain {
    margin-left: 0;
    width: 100%;
  }
}

/* ---------- Shared Components ---------- */
.section {
  padding-block: clamp(4rem, 8vw, 6.5rem);
}

.section--ink {
  background: var(--color-ink);
}

.section--teal {
  background: var(--color-teal);
}

.section--indigo {
  background: var(--color-indigo);
}

.section--wine {
  background: var(--color-wine);
}

.section-head {
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.section-head__index {
  display: inline-flex;
  margin-bottom: 0.875rem;
}

.section-head__title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--color-paper);
}

.section-head__subtitle {
  margin-top: 0.75rem;
  max-width: 56ch;
  font-size: 1rem;
  color: var(--color-mist);
}

.section-head--center {
  text-align: center;
}

.section-head--center .section-head__subtitle {
  margin-inline: auto;
}

.index-code {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  border: 1px solid var(--line-strong);
  background: rgba(16, 26, 58, 0.55);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--color-gold);
  white-space: nowrap;
}

.index-code::before {
  content: "[ ";
  color: var(--color-orange);
}

.index-code::after {
  content: " ]";
  color: var(--color-orange);
}

.panel {
  position: relative;
  padding: clamp(1.375rem, 3vw, 2.25rem);
  border: 1px solid var(--line);
  background: var(--color-ink);
}

.panel--teal {
  background: var(--color-teal);
}

.panel--indigo {
  background: var(--color-indigo);
}

.panel--wine {
  background: var(--color-wine);
}

.panel--ghost {
  background: rgba(16, 26, 58, 0.4);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 24px;
  padding: 0.125rem 0.625rem;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--color-paper);
}

.tag::before {
  content: "";
  width: 5px;
  height: 5px;
  flex: 0 0 auto;
  background: currentColor;
}

.tag--orange {
  border-color: rgba(255, 107, 44, 0.55);
  color: var(--color-orange);
}

.tag--gold {
  border-color: rgba(229, 168, 58, 0.55);
  color: var(--color-gold);
}

.tag--green {
  border-color: rgba(60, 214, 138, 0.55);
  color: var(--color-green);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.625rem 1.5rem;
  border: 1px solid var(--color-orange);
  background: var(--color-orange);
  color: var(--color-deep);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  white-space: nowrap;
  transition: background 200ms var(--ease), color 200ms var(--ease), border-color 200ms var(--ease);
}

.btn:hover {
  background: transparent;
  color: var(--color-orange);
}

.btn--ghost {
  background: transparent;
  color: var(--color-paper);
  border-color: var(--line-strong);
}

.btn--ghost:hover {
  background: transparent;
  color: var(--color-gold);
  border-color: var(--color-gold);
}

.btn--gold {
  background: var(--color-gold);
  border-color: var(--color-gold);
  color: var(--color-deep);
}

.btn--gold:hover {
  background: transparent;
  color: var(--color-gold);
}

.breadcrumbs {
  padding: calc(var(--header-h) + 2rem) 0 0.5rem;
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--color-slate);
}

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

.breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin: 0 0.625rem;
  color: var(--color-gold);
}

.breadcrumbs__link {
  color: var(--color-mist);
  transition: color 200ms var(--ease);
}

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

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

.divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--color-slate);
}

.divider::before {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line), transparent);
}

.divider::after {
  content: "";
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--color-orange);
}

.hairline {
  height: 1px;
  border: 0;
  background: var(--line);
}

.metric {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-gold);
}

.metric__label {
  display: block;
  margin-top: 0.375rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0;
  color: var(--color-mist);
}

.image-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    linear-gradient(var(--line-muted) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-muted) 1px, transparent 1px),
    var(--color-ink);
  background-size: 24px 24px;
}

.image-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.image-frame[data-ratio="wide"]::before {
  padding-top: 56.25%;
}

.image-frame[data-ratio="square"]::before {
  padding-top: 100%;
}

.image-frame[data-ratio="portrait"]::before {
  padding-top: 125%;
}

.image-frame[data-ratio="cinema"]::before {
  padding-top: 42.5%;
}

.image-frame__media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-frame__index {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 1;
  padding: 0.25rem 0.5rem;
  background: rgba(10, 17, 40, 0.8);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--color-paper);
  pointer-events: none;
}

.grid-bg {
  background-image:
    linear-gradient(var(--line-muted) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-muted) 1px, transparent 1px);
  background-size: 32px 32px;
}

.diagonal-cut {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 32px), 0 100%);
}

.diagonal-cut--top {
  clip-path: polygon(0 32px, 100% 0, 100% 100%, 0 100%);
}

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

  .header-progress {
    transition: none;
  }
}