/* ========================================
   星空体育全站 — Shared Site Styles
   /assets/site.css
   ======================================== */

/* ---------- 1. Reset & Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  min-height: 100vh;
  font-family: "Noto Sans SC", "Open Sans", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  font-size: clamp(1rem, 1.2vw, 1.125rem);
  line-height: 1.5;
  color: #F4F7FB;
  background-color: #050D1F;
  background-image:
    radial-gradient(ellipse 80% 50% at 85% -10%, rgba(46, 91, 255, 0.10), transparent),
    radial-gradient(ellipse 40% 30% at 10% 10%, rgba(245, 184, 31, 0.04), transparent);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

ul[class],
ol[class] {
  list-style: none;
}

a {
  color: #2E5BFF;
  text-decoration: none;
}

a:hover {
  color: #F5B81F;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  font-weight: 900;
  line-height: 1.15;
}

p {
  margin: 0;
}

table {
  border-collapse: collapse;
  width: 100%;
}

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

::selection {
  background: #F5B81F;
  color: #050D1F;
}

:focus-visible {
  outline: 2px solid #F5B81F;
  outline-offset: 2px;
}

#main-content {
  scroll-margin-top: 110px;
}

/* ---------- 2. CSS Variables ---------- */
:root {
  --color-primary: #0B1B3F;
  --color-accent: #F5B81F;
  --color-secondary: #2E5BFF;
  --color-text: #F4F7FB;
  --color-text-dim: #B0BEC5;
  --color-bg: #050D1F;
  --color-light: #E8EDF5;
  --color-danger: #E74C3C;

  --font-headline: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-body: "Noto Sans SC", "Open Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "Roboto Mono", "SFMono-Regular", "Cascadia Code", Consolas, "Courier New", monospace;

  --h1: clamp(2.5rem, 6vw, 5rem);
  --h2: clamp(2rem, 4vw, 3.5rem);
  --h3: clamp(1.5rem, 3vw, 2.5rem);
  --body: clamp(1rem, 1.2vw, 1.125rem);
  --data-lg: clamp(3rem, 8vw, 8rem);

  --content-max: 1240px;
  --gutter: 1.5rem;

  --border-fine: 1px solid rgba(244, 247, 251, 0.10);
  --border-gold: 1px solid rgba(245, 184, 31, 0.35);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- 3. Visible Utility (sr-only) ---------- */
.sr-only,
.nav-toggle__sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 4. Layout Container ---------- */
.container {
  width: min(100% - var(--gutter) * 2, var(--content-max));
  margin-inline: auto;
}

.container--narrow {
  max-width: 860px;
}

.section {
  padding: clamp(3rem, 6vw, 6rem) 0;
}

.section--tight {
  padding: clamp(2rem, 3vw, 4rem) 0;
}

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

.section__label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.section__label::before {
  content: "";
  width: 20px;
  height: 2px;
  background: var(--color-accent);
  transform: skewX(-30deg);
}

.section__title {
  font-size: var(--h2);
  margin-bottom: 1rem;
  font-weight: 900;
}

.section__desc {
  color: var(--color-text-dim);
  max-width: 720px;
  line-height: 1.7;
}

.section--light .section__desc {
  color: rgba(5, 13, 31, 0.75);
}

/* ---------- 5. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.5rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1;
  border: 1px solid transparent;
  border-radius: 0;
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}

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

.btn--gold:hover,
.btn--gold:focus-visible {
  background: #ffc940;
  border-color: #ffc940;
  color: var(--color-bg);
  box-shadow: 0 0 24px rgba(245, 184, 31, 0.35);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: rgba(244, 247, 251, 0.3);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--sm {
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
}

.btn--pulse {
  animation: btnPulse 2.6s var(--ease-out) infinite;
}

@keyframes btnPulse {
  0% {
    box-shadow: 0 0 0 0 rgba(245, 184, 31, 0.55);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(245, 184, 31, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(245, 184, 31, 0);
  }
}

/* ---------- 6. Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  padding: 1rem 0;
}

.breadcrumb a {
  color: var(--color-text-dim);
  transition: color 0.2s;
}

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

.breadcrumb__sep {
  color: var(--color-accent);
  opacity: 0.6;
}

/* ---------- 7. Page Header ---------- */
.page-header {
  position: relative;
  padding: clamp(2.5rem, 5vw, 4.5rem) 0 2rem;
  border-bottom: var(--border-fine);
  margin-bottom: 2rem;
}

.page-header__label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.page-header__label::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--color-accent);
}

.page-header__title {
  font-size: var(--h1);
  margin-top: 0.5rem;
  font-weight: 900;
}

.page-header__desc {
  color: var(--color-text-dim);
  max-width: 640px;
  margin-top: 0.75rem;
}

/* ---------- 8. Grid & Card ---------- */
.grid {
  display: grid;
  gap: var(--gutter);
}

.grid--split {
  grid-template-columns: 11fr 9fr;
  align-items: start;
}

.grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

.card {
  position: relative;
  background: var(--color-primary);
  border-left: 2px solid transparent;
  padding: 1.5rem;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.2);
  transition: border-color 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}

.card:hover {
  border-left-color: var(--color-accent);
  transform: translateY(-4px);
}

.card__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.card__body {
  color: var(--color-text-dim);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---------- 9. Data Display ---------- */
.data-number {
  font-family: var(--font-data);
  font-size: var(--data-lg);
  font-weight: 700;
  line-height: 1;
  color: var(--color-accent);
  letter-spacing: -0.03em;
}

.data-label {
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ---------- 10. Data Table ---------- */
.data-table {
  width: 100%;
  font-size: 0.9rem;
}

.data-table th {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid rgba(245, 184, 31, 0.3);
  color: var(--color-accent);
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  text-transform: uppercase;
}

.data-table td {
  padding: 0.75rem 1rem;
  border-bottom: var(--border-fine);
  color: var(--color-text-dim);
}

.data-table tbody tr {
  transition: background 0.2s ease;
}

.data-table tbody tr:hover {
  background: rgba(11, 27, 63, 0.6);
}

.data-table tbody tr:hover td {
  color: var(--color-text);
}

/* ---------- 11. Study Board ---------- */
.study-board {
  position: relative;
  border: 1px solid rgba(244, 247, 251, 0.08);
  background: rgba(11, 27, 63, 0.4);
}

.study-board::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--color-accent);
}

.study-board__head {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid rgba(244, 247, 251, 0.08);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.study-board__body {
  padding: 1.5rem;
}

.study-board__term {
  display: inline-block;
  color: var(--color-text-dim);
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border: 1px solid rgba(245, 184, 31, 0.25);
  margin: 0 0.5rem 0.5rem 0;
}

/* ---------- 12. Image Frame ---------- */
.image-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-bg) 100%);
  border: 1px solid rgba(244, 247, 251, 0.1);
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-frame--wide {
  aspect-ratio: 16 / 7;
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: relative;
  z-index: 1;
}

.image-frame[data-caption]::after {
  content: attr(data-caption);
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.5rem 0.75rem;
  font-size: 0.75rem;
  color: var(--color-text);
  background: rgba(5, 13, 31, 0.75);
  z-index: 2;
}

.image-frame__placeholder {
  color: var(--color-text-dim);
  font-size: 0.875rem;
  letter-spacing: 0.12em;
  text-align: center;
  padding: 1rem;
  z-index: 1;
}

/* ---------- 13. Tag / Divider ---------- */
.tag,
.trust-badge {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  border: var(--border-gold);
  color: var(--color-accent);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  line-height: 1.4;
}

.divider {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, transparent, rgba(245, 184, 31, 0.5), transparent);
  margin: 2rem 0;
}

/* ---------- 14. Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(5, 13, 31, 0.92);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: var(--border-fine);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.site-header::before {
  content: "";
  display: block;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--color-accent) 20%, var(--color-secondary) 80%, transparent 100%);
}

.site-header.is-scrolled {
  background: rgba(5, 13, 31, 0.97);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
}

.site-header__inner {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.site-header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
  transition: padding 0.3s var(--ease-out);
}

.site-header.is-scrolled .site-header__top {
  padding: 0.4rem 0;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
}

.site-logo {
  flex-shrink: 0;
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.site-header__brand-name {
  font-family: var(--font-headline);
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--color-text);
  letter-spacing: 0.04em;
  line-height: 1;
  transition: font-size 0.3s var(--ease-out);
}

.site-header.is-scrolled .site-header__brand-name {
  font-size: 1rem;
}

.site-header__brand-tag {
  font-size: 0.6875rem;
  color: var(--color-text-dim);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  transition: font-size 0.3s var(--ease-out), letter-spacing 0.3s var(--ease-out);
}

.site-header.is-scrolled .site-header__brand-tag {
  font-size: 0.625rem;
  letter-spacing: 0.12em;
}

.site-header__action {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.site-header__status {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  color: var(--color-text-dim);
  letter-spacing: 0.05em;
}

.status-dot {
  width: 7px;
  height: 7px;
  background: var(--color-accent);
  transform: rotate(45deg);
  animation: statusPulse 2.4s var(--ease-out) infinite;
}

@keyframes statusPulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(245, 184, 31, 0.55);
  }
  50% {
    box-shadow: 0 0 0 6px rgba(245, 184, 31, 0);
  }
}

.site-header__nav-bar {
  border-top: 1px solid rgba(244, 247, 251, 0.07);
}

.site-nav__list {
  display: flex;
  gap: 0.2rem;
}

.site-nav__item {
  position: relative;
}

.site-nav__link {
  display: block;
  padding: 0.65rem 0.9rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-dim);
  letter-spacing: 0.04em;
  transition: color 0.2s ease;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0.9rem;
  right: 0.9rem;
  bottom: 0;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-out);
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--color-text);
}

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

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

/* ---------- 15. Nav Toggle ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: 1px solid rgba(244, 247, 251, 0.22);
  background: transparent;
}

.nav-toggle__line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-accent);
  transition: transform 0.3s ease, opacity 0.25s ease;
}

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

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

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

/* ---------- 16. Skip Link ---------- */
.skip-link {
  position: fixed;
  top: -100px;
  left: 1rem;
  z-index: 2000;
  background: var(--color-accent);
  color: var(--color-bg);
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  font-size: 0.875rem;
  border-radius: 0;
  transition: top 0.25s var(--ease-out);
}

.skip-link:focus {
  top: 1rem;
  color: var(--color-bg);
  outline: none;
}

/* ---------- 17. Footer ---------- */
.site-footer {
  position: relative;
  background: var(--color-bg);
  color: var(--color-text-dim);
}

.site-footer::before {
  content: "";
  display: block;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent) 30%, rgba(46, 91, 255, 0.7) 80%, transparent);
}

.site-footer__inner {
  max-width: var(--content-max);
  margin-inline: auto;
  padding: 3.5rem var(--gutter) 0;
}

.site-footer__top {
  display: grid;
  grid-template-columns: 1.5fr 0.8fr 0.8fr 1.2fr;
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(244, 247, 251, 0.07);
}

.site-footer__brand-block {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.site-footer__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.site-footer__brand-name {
  font-family: var(--font-headline);
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--color-text);
  letter-spacing: 0.04em;
}

.site-footer__slogan {
  font-size: 0.875rem;
  line-height: 1.7;
  max-width: 26rem;
  margin-bottom: 1.2rem;
  color: var(--color-text-dim);
}

.site-footer__trust {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.site-footer__col {
  min-width: 0;
}

.site-footer__heading {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: 1.25rem;
  padding-left: 0.75rem;
  position: relative;
}

.site-footer__heading::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.2rem;
  bottom: 0.2rem;
  width: 3px;
  background: var(--color-accent);
  transform: skew(-15deg);
}

.site-footer__links li {
  margin-bottom: 0.55rem;
}

.site-footer__links a {
  font-size: 0.875rem;
  color: var(--color-text-dim);
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.25s ease;
}

.site-footer__links a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}

.site-footer__contact li {
  margin-bottom: 0.75rem;
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--color-text-dim);
}

.site-footer__contact-label {
  display: block;
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.6;
  margin-bottom: 0.15rem;
}

.site-footer__contact a {
  color: var(--color-text-dim);
}

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

.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 1.5rem 0;
  font-size: 0.75rem;
  color: rgba(176, 190, 197, 0.7);
}

.site-footer__copyright,
.site-footer__icp {
  letter-spacing: 0.08em;
}

/* ---------- 18. Reveal Motion ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

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

/* ---------- 19. Responsive ---------- */
@media (max-width: 1024px) {
  .site-footer__top {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .site-header__status {
    display: none;
  }
}

@media (max-width: 900px) {
  .site-header__top {
    padding: 0.75rem 0;
  }

  .site-header__nav-bar {
    border-top: 0;
  }

  .site-nav {
    display: block;
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    padding: 0 var(--gutter);
    transition: max-height 0.45s var(--ease-out), opacity 0.35s ease, padding 0.3s ease;
  }

  .site-nav[data-open] {
    max-height: 500px;
    opacity: 1;
    padding: 0.75rem var(--gutter) 1.25rem;
  }

  .site-nav__list {
    flex-direction: column;
    gap: 0.15rem;
  }

  .site-nav__link {
    padding: 0.8rem 0.25rem;
    border-left: 2px solid transparent;
    font-size: 0.95rem;
  }

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

  .site-nav__link:hover,
  .site-nav__link:focus-visible,
  .site-nav__link[aria-current="page"] {
    border-left-color: var(--color-accent);
    background: linear-gradient(90deg, rgba(245, 184, 31, 0.08), transparent);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .grid--split {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 1rem;
  }

  .site-header__brand-tag {
    display: none;
  }

  .btn--sm {
    padding: 0.5rem 0.8rem;
    font-size: 0.75rem;
  }

  .site-footer__top {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

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

  .grid--4,
  .grid--3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 420px) {
  .site-header__brand-name {
    font-size: 1rem;
  }

  .site-header__action .btn--sm {
    padding: 0.4rem 0.6rem;
    font-size: 0.7rem;
  }
}

/* ---------- 20. Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  html:focus-within {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }

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