/* =====================================================================
   九博体育入口 · 全站共享样式 /assets/site.css
   仪表盘式视觉：深蓝面板、金色刻度、亮橙信号
   ===================================================================== */

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-dark);
  background: var(--c-light);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  padding-top: var(--h-header);
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--c-gold);
  outline-offset: 3px;
}

/* ---------- variables ---------- */
:root {
  --c-navy: #0A1B2A;
  --c-gold: #D4AF37;
  --c-gold-deep: #8F7410;
  --c-orange: #FF6B35;
  --c-blue: #1B3A5C;
  --c-light: #F4F6F8;
  --c-gray: #D1D5DB;
  --c-dark: #33393F;
  --c-white: #FFFFFF;

  --font-head: system-ui, 'Noto Sans SC', 'PingFang SC', 'Microsoft Yahei', sans-serif;
  --font-body: Georgia, 'Noto Serif SC', 'Songti SC', serif;

  --container: 1180px;
  --gap: 24px;
  --h-header: 72px;
  --h-header-mobile: 60px;

  --dur: 240ms;
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
  --space-5: 64px;
  --space-6: 96px;
}

/* ---------- base typography ---------- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.2;
  color: var(--c-navy);
  text-wrap: balance;
}

h1 { font-size: 48px; letter-spacing: -0.015em; }
h2 { font-size: 36px; letter-spacing: -0.01em; }
h3 { font-size: 28px; }
h4 { font-size: 20px; }

p {
  text-wrap: pretty;
}

small {
  font-size: 12px;
}

::selection {
  background: var(--c-gold);
  color: var(--c-navy);
}

/* ---------- layout ---------- */
.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gap);
}

.section {
  padding-block: var(--space-6);
  position: relative;
}

.section--white { background: var(--c-white); }
.section--tint { background: var(--c-light); }
.section--dark { background: var(--c-navy); color: rgba(255, 255, 255, 0.7); }
.section--dark h2,
.section--dark h3,
.section--dark h4 { color: var(--c-white); }

.grid {
  display: grid;
  gap: var(--space-4);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--aside { grid-template-columns: minmax(0, 1fr) 340px; }

/* ---------- section heading ---------- */
.section-heading {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  position: relative;
}

.section-heading--center {
  text-align: center;
  justify-content: center;
}

.section-heading--center .section-heading__body {
  flex: none;
}

.section-heading__index {
  font-family: var(--font-head);
  font-size: 44px;
  font-weight: 900;
  line-height: 1;
  color: var(--c-gold-deep);
  letter-spacing: -0.02em;
  min-width: 44px;
}

.section--dark .section-heading__index {
  color: var(--c-gold);
}

.section-heading__title {
  font-size: 28px;
  line-height: 1.25;
}

.section-heading__rule {
  width: 52px;
  height: 3px;
  background: linear-gradient(90deg, var(--c-gold), var(--c-orange));
  margin: 10px 0;
}

.section-heading__subtitle {
  font-size: 14px;
  font-family: var(--font-body);
  color: rgba(51, 57, 63, 0.68);
}

.section--dark .section-heading__subtitle {
  color: rgba(255, 255, 255, 0.5);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  border: 2px solid transparent;
  text-align: center;
  white-space: nowrap;
  transition:
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(10, 27, 42, 0.16);
}

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

.btn--primary {
  background: var(--c-orange);
  color: var(--c-navy);
}

.btn--primary:hover {
  background: #E8531F;
}

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

.btn--ghost:hover {
  background: var(--c-gold);
  color: var(--c-navy);
}

.btn--dark {
  background: var(--c-navy);
  color: var(--c-white);
}

.btn--dark:hover {
  background: var(--c-blue);
}

.btn--light {
  background: var(--c-white);
  color: var(--c-navy);
}

.btn--light:hover {
  background: var(--c-light);
}

/* ---------- cards ---------- */
.card {
  background: var(--c-white);
  border: 1px solid var(--c-gray);
  padding: var(--space-4);
  position: relative;
  transition:
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 32px rgba(10, 27, 42, 0.10);
}

.card--dark {
  background: var(--c-blue);
  border-color: transparent;
}

.card--dark h3,
.card--dark h4 {
  color: var(--c-white);
}

.card__title {
  font-size: 20px;
  margin-bottom: 8px;
}

.card__text {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(51, 57, 63, 0.78);
}

.card--dark .card__text {
  color: rgba(255, 255, 255, 0.66);
}

.card__meta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-gold-deep);
}

.card--dark .card__meta {
  color: var(--c-gold);
}

/* ---------- panel ---------- */
.panel {
  background: var(--c-white);
  border: 1px solid var(--c-gray);
  border-left: 3px solid var(--c-gold);
  padding: var(--space-4);
}

.panel--dark {
  background: var(--c-blue);
  border-color: transparent;
  border-left-color: var(--c-gold);
  color: rgba(255, 255, 255, 0.7);
}

.panel--dark h3 {
  color: var(--c-white);
}

/* ---------- breadcrumbs ---------- */
.breadcrumbs {
  margin-bottom: var(--space-4);
  font-size: 14px;
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.breadcrumbs__item + .breadcrumbs__item::before {
  content: '›';
  color: var(--c-gold-deep);
}

.breadcrumbs__link {
  color: rgba(51, 57, 63, 0.62);
  transition: color var(--dur) var(--ease);
}

.breadcrumbs__link:hover {
  color: var(--c-gold-deep);
}

.breadcrumbs__current {
  color: var(--c-navy);
  font-weight: 700;
}

/* ---------- table ---------- */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.table th {
  background: var(--c-navy);
  color: var(--c-white);
  font-family: var(--font-head);
  font-weight: 700;
  text-align: left;
  padding: 14px 16px;
}

.table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--c-gray);
  background: var(--c-white);
}

.table tbody tr:hover td {
  background: var(--c-light);
}

/* ---------- image placeholder ---------- */
.image-placeholder {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 220px;
  background: linear-gradient(135deg, var(--c-blue), var(--c-navy));
  overflow: hidden;
  text-align: center;
}

.image-placeholder::before {
  content: attr(data-label);
  position: relative;
  z-index: 1;
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.6);
  padding: 0 20px;
}

.image-placeholder::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  width: 64px;
  height: 64px;
  border: 1px solid var(--c-gold);
  transform: translate(-50%, -50%) rotate(45deg);
  opacity: 0.35;
}

.image-placeholder--wide {
  aspect-ratio: 16 / 9;
  min-height: auto;
}

.image-placeholder--tall {
  aspect-ratio: 3 / 4;
  min-height: auto;
}

/* ---------- page hero ---------- */
.page-hero {
  background: var(--c-navy);
  color: rgba(255, 255, 255, 0.72);
  padding: calc(var(--h-header) + 40px) 0 56px;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  right: -80px;
  top: -80px;
  width: 260px;
  height: 260px;
  background: var(--c-blue);
  transform: rotate(45deg);
  opacity: 0.55;
}

.page-hero::after {
  content: '';
  position: absolute;
  right: 80px;
  bottom: -120px;
  width: 180px;
  height: 180px;
  border: 1px solid rgba(212, 175, 55, 0.4);
  transform: rotate(45deg);
}

.page-hero__meta {
  position: relative;
  z-index: 1;
  margin-bottom: 16px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-gold);
}

.page-hero__title {
  position: relative;
  z-index: 1;
  color: var(--c-white);
  font-size: 36px;
  margin-bottom: 10px;
}

.page-hero__subtitle {
  position: relative;
  z-index: 1;
  font-size: 16px;
  line-height: 1.7;
  max-width: 660px;
}

/* ---------- header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--h-header);
  background: var(--c-navy);
  border-bottom: 1px solid rgba(212, 175, 55, 0.32);
  box-shadow: 0 2px 20px rgba(10, 27, 42, 0.3);
}

.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.skip-link {
  position: fixed;
  top: -60px;
  left: 16px;
  z-index: 1001;
  background: var(--c-gold);
  color: var(--c-navy);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  padding: 12px 20px;
  border-radius: 0;
  transition: top var(--dur) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 12px;
  outline: none;
}

.progress-bar {
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--c-gold), var(--c-orange));
  z-index: 2;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.site-header__brand-mark {
  position: relative;
  display: block;
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, var(--c-gold) 0%, var(--c-gold) 48%, var(--c-orange) 52%, var(--c-orange) 100%);
  transform: rotate(45deg);
  border-radius: 2px;
  box-shadow: 0 0 0 2px rgba(212, 175, 55, 0.18);
  flex-shrink: 0;
}

.site-header__brand-mark::after {
  content: '';
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(255, 255, 255, 0.75);
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.site-header__brand-name {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--c-white);
}

.site-header__brand-accent {
  color: var(--c-gold);
}

.site-header__brand-tag {
  font-family: var(--font-head);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(212, 175, 55, 0.85);
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid rgba(212, 175, 55, 0.4);
  flex-shrink: 0;
}

.site-header__toggle-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--c-gold);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

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

.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.site-header__nav {
  display: flex;
  align-items: center;
}

.site-header__menu {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-header__link {
  position: relative;
  display: inline-block;
  padding: 10px 14px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.82);
  transition: color var(--dur) var(--ease);
}

.site-header__link::after {
  content: '';
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 3px;
  height: 2px;
  background: var(--c-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}

.site-header__link:hover {
  color: var(--c-white);
}

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

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

/* ---------- footer ---------- */
.site-footer {
  position: relative;
  background: var(--c-navy);
  color: rgba(255, 255, 255, 0.58);
  font-size: 14px;
}

.site-footer__rule {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-gold) 0%, var(--c-gold) 180px, var(--c-orange) 300px, var(--c-blue) 60%);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding: 56px 0 40px;
}

.site-footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.site-footer__brand-mark {
  display: block;
  width: 20px;
  height: 20px;
  background: linear-gradient(135deg, var(--c-gold), var(--c-orange));
  transform: rotate(45deg);
  flex-shrink: 0;
}

.site-footer__brand-name {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--c-white);
}

.site-footer__slogan {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.5);
  max-width: 280px;
}

.site-footer__heading {
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(212, 175, 55, 0.22);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-gold);
}

.site-footer__links li {
  margin-bottom: 10px;
}

.site-footer__links a {
  display: inline-block;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.site-footer__links a:hover {
  color: var(--c-gold);
  padding-left: 6px;
}

.site-footer__contact li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 14px;
  line-height: 1.6;
}

.site-footer__contact-label {
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(212, 175, 55, 0.7);
}

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding: 22px 0;
  border-top: 1px solid rgba(212, 175, 55, 0.18);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.42);
}

.site-footer__copyright {
  font-size: 13px;
}

.site-footer__icp {
  font-size: 13px;
}

.site-footer__bottom-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.site-footer__bottom-links a {
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--dur) var(--ease);
}

.site-footer__bottom-links a:hover {
  color: var(--c-gold);
}

/* ---------- back to top ---------- */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 50;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  background: var(--c-gold);
  color: var(--c-navy);
  border: 2px solid transparent;
  box-shadow: 0 6px 16px rgba(10, 27, 42, 0.2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition:
    opacity var(--dur) var(--ease),
    visibility var(--dur) var(--ease),
    transform var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.back-to-top:hover {
  background: var(--c-orange);
  color: var(--c-white);
  transform: translateY(-3px);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top__arrow {
  font-size: 20px;
  line-height: 1;
}

/* ---------- reveal animation ---------- */
.js-enabled [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

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

/* ---------- main content anchor ---------- */
#main-content {
  display: block;
  scroll-margin-top: calc(var(--h-header) + 16px);
}

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

/* ---------- responsive ---------- */
@media (max-width: 1024px) {
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid--aside {
    grid-template-columns: minmax(0, 1fr);
  }

  .site-footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 40px;
  }
}

@media (max-width: 900px) {
  body {
    padding-top: var(--h-header-mobile);
  }

  .site-header {
    height: var(--h-header-mobile);
  }

  .site-header__toggle {
    display: inline-flex;
  }

  .site-header__nav {
    display: block;
    position: fixed;
    top: var(--h-header-mobile);
    left: 0;
    right: 0;
    background: var(--c-navy);
    border-top: 1px solid rgba(212, 175, 55, 0.25);
    border-bottom: 1px solid rgba(212, 175, 55, 0.25);
    box-shadow: 0 16px 32px rgba(10, 27, 42, 0.4);
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition:
      transform var(--dur) var(--ease),
      opacity var(--dur) var(--ease),
      visibility var(--dur) var(--ease);
    max-height: calc(100vh - var(--h-header-mobile));
    overflow-y: auto;
  }

  .site-header__nav[data-open] {
    transform: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .site-header__menu {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px var(--gap) 22px;
  }

  .site-header__link {
    display: block;
    padding: 14px 10px;
    border-bottom: 1px solid rgba(212, 175, 55, 0.12);
    font-size: 17px;
  }

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

  .site-header__link[aria-current="page"] {
    color: var(--c-gold);
    padding-left: 16px;
    border-left: 3px solid var(--c-gold);
  }

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

@media (max-width: 768px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: minmax(0, 1fr);
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 36px;
    padding-top: 44px;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .section {
    padding-block: var(--space-5);
  }

  .page-hero {
    padding: calc(var(--h-header-mobile) + 32px) 0 40px;
  }

  .section-heading {
    gap: var(--space-2);
  }

  .section-heading__index {
    font-size: 36px;
  }
}

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

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