/* =========================================================
   米兰体育官网CN — SITE.CSS
   高原数据编辑部 · 全站共享样式
   ========================================================= */

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

:root {
  --color-bg: #0a192f;
  --color-bg-card: #112240;
  --color-bg-raised: #172a45;
  --color-accent: #ff6b35;
  --color-accent-2: #ffd700;
  --color-ok: #64ffda;
  --color-text: #ffffff;
  --color-text-2: #8892b0;
  --color-line: #a8b2d1;
  --color-text-invert: #e6f1ff;

  --font-display: "Arial Black", "Impact", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Open Sans", "Source Han Sans CN", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", "Cascadia Mono", Consolas, monospace;

  --container: 1200px;
  --header-height: 64px;
  --radius: 14px;
  --transition: 0.2s ease;
  --shadow: 0 16px 40px rgba(2, 12, 27, 0.45);
}

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

body {
  background: var(--color-bg);
  color: var(--color-text-2);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 55% 35% at 85% -8%, rgba(255, 107, 53, 0.07), transparent 65%),
    radial-gradient(ellipse 35% 25% at -5% 100%, rgba(255, 215, 0, 0.05), transparent 60%);
}

main {
  flex: 1 0 auto;
  width: 100%;
}

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

a {
  color: var(--color-accent-2);
  text-decoration: none;
  transition: color var(--transition);
}

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

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

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

p, li {
  text-wrap: pretty;
}

h1, h2, h3, h4 {
  text-wrap: balance;
}

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-bg-raised);
  border-radius: 8px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent);
}

@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;
  }
}

/* ---------- Layout primitives ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.section {
  padding-block: 4rem;
}

.section--tight {
  padding-block: 2.5rem;
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

/* ---------- Typography helpers ---------- */
.section-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.5vw, 2.125rem);
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: 1.25rem;
  letter-spacing: 0.01em;
}

.mono {
  font-family: var(--font-mono);
}

.text-secondary {
  color: var(--color-text-2);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border-radius: 10px;
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-accent) 0%, #f25c2a 100%);
  color: #fff;
  box-shadow: 0 8px 20px rgba(255, 107, 53, 0.28);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(255, 107, 53, 0.4);
  color: #fff;
}

.btn--ghost {
  border: 1px solid rgba(136, 146, 176, 0.35);
  color: var(--color-text-2);
  background: transparent;
}

.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

/* ---------- Tags & cards ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  background: rgba(255, 215, 0, 0.1);
  border: 1px solid rgba(255, 215, 0, 0.28);
  color: var(--color-accent-2);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.card {
  background: var(--color-bg-card);
  border: 1px solid rgba(168, 178, 209, 0.12);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 107, 53, 0.4);
  box-shadow: var(--shadow);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding-block: 0.75rem 1.5rem;
  font-size: 0.8125rem;
  color: var(--color-text-2);
}

.breadcrumb a {
  color: var(--color-text-2);
}

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

.breadcrumb__sep {
  font-family: var(--font-mono);
  color: var(--color-accent);
  opacity: 0.7;
}

.breadcrumb [aria-current="page"] {
  color: var(--color-text);
  font-weight: 700;
}

/* ---------- Image frame ---------- */
.img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--color-bg-card), var(--color-bg-raised));
  border: 1px solid rgba(168, 178, 209, 0.14);
  aspect-ratio: 4 / 3;
  isolation: isolate;
}

.img-frame--wide {
  aspect-ratio: 16 / 9;
}

.img-frame--tall {
  aspect-ratio: 3 / 4;
}

.img-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  border-radius: inherit;
  background:
    linear-gradient(120deg, transparent 30%, rgba(255, 215, 0, 0.07) 50%, transparent 70%),
    repeating-linear-gradient(100deg, transparent 0 18px, rgba(168, 178, 209, 0.04) 18px 19px);
}

.img-frame img {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-frame--real::after {
  content: none;
}

/* ---------- Stats ---------- */
.stat {
  background: var(--color-bg-card);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 10px 10px 0;
  padding: 1rem 1.25rem;
  transition: transform var(--transition), border-color var(--transition);
}

.stat:hover {
  border-left-color: var(--color-accent-2);
  transform: translateY(-2px);
}

.stat__value {
  font-family: var(--font-mono);
  font-size: 1.875rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

.stat__label {
  font-size: 0.8125rem;
  color: var(--color-text-2);
  margin-top: 0.25rem;
}

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

/* ---------- Skip link ---------- */
.skip-link {
  position: fixed;
  top: -100px;
  left: 1rem;
  z-index: 2000;
  padding: 0.625rem 1.25rem;
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  border-radius: 0 0 10px 10px;
  box-shadow: var(--shadow);
  transition: top 0.2s ease;
}

.skip-link:hover {
  color: #fff;
}

.skip-link:focus-visible {
  top: 0;
}

/* ---------- Header / Command bar ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 25, 47, 0.86);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(168, 178, 209, 0.16);
  transition: box-shadow var(--transition), background var(--transition);
}

body[data-scrolled="true"] .site-header {
  background: rgba(10, 25, 47, 0.94);
  box-shadow: 0 12px 32px rgba(2, 12, 27, 0.35);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  height: var(--header-height);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex: none;
  background: rgba(255, 107, 53, 0.12);
  border: 1px solid rgba(255, 107, 53, 0.3);
  border-radius: 12px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.brand-mark:hover {
  transform: rotate(-6deg) scale(1.04);
}

.brand-mark__svg {
  width: 28px;
  height: 28px;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  flex: none;
  color: var(--color-text);
}

.site-header__brand:hover {
  color: var(--color-text);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-text strong {
  font-family: var(--font-display);
  font-size: 1.125rem;
  letter-spacing: 0.02em;
  font-weight: 900;
}

.brand-text small {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ok);
  margin-top: 2px;
}

.brand-status {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-ok);
  box-shadow: 0 0 0 0 rgba(100, 255, 218, 0.5);
  animation: brandPulse 2s infinite;
}

@keyframes brandPulse {
  0% { box-shadow: 0 0 0 0 rgba(100, 255, 218, 0.5); }
  70% { box-shadow: 0 0 0 5px rgba(100, 255, 218, 0); }
  100% { box-shadow: 0 0 0 0 rgba(100, 255, 218, 0); }
}

/* ---------- site nav ---------- */
.site-nav {
  margin-left: auto;
}

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

.site-nav__item {
  position: relative;
}

.site-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.625rem;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-text-2);
  border-radius: 8px;
  white-space: nowrap;
  transition: color var(--transition), background var(--transition);
}

.site-nav__link:hover {
  color: var(--color-text);
  background: rgba(255, 107, 53, 0.1);
}

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 500;
  color: var(--color-accent);
  line-height: 1;
  transition: color var(--transition);
}

.site-nav__link:hover .site-nav__index {
  color: var(--color-accent-2);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0.625rem;
  right: 0.625rem;
  bottom: 0.25rem;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
  border-radius: 2px;
  transform: skewX(-24deg) scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s ease;
}

.site-nav__link:hover::after {
  transform: skewX(-24deg) scaleX(1);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-text);
  background: linear-gradient(120deg, rgba(255, 107, 53, 0.16), rgba(255, 215, 0, 0.06));
}

.site-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 50%;
  width: 5px;
  height: 18px;
  background: var(--color-accent);
  border-radius: 2px;
  transform: translateY(-50%) skewX(-14deg);
}

.site-nav__link[aria-current="page"]::after {
  transform: skewX(-24deg) scaleX(1);
}

/* ---------- header actions ---------- */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex: none;
}

.header-action {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.625rem;
  border-radius: 8px;
  color: var(--color-text-2);
  font-size: 0.8125rem;
  font-weight: 600;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}

.header-action:hover {
  color: var(--color-accent-2);
  background: rgba(255, 215, 0, 0.08);
  border-color: rgba(255, 215, 0, 0.25);
}

.header-action__icon {
  flex: none;
}

.header-action__label {
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
}

/* ---------- nav toggle ---------- */
.nav-toggle {
  display: none;
}

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-text);
  transition: transform 0.25s ease, opacity 0.2s ease;
}

/* ---------- scroll progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1001;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
  pointer-events: none;
  transition: width 0.06s linear;
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: auto;
  background: linear-gradient(180deg, var(--color-bg), #06101f);
  border-top: 1px solid rgba(168, 178, 209, 0.15);
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  height: 3px;
  width: 45%;
  background: linear-gradient(90deg, var(--color-accent) 0 55%, var(--color-accent-2) 55% 80%, transparent 80%);
  transform: skewX(-30deg);
  transform-origin: left top;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.9fr 0.9fr 1.2fr;
  gap: 2.5rem;
  padding-block: 3.25rem 2.5rem;
}

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

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.footer-brand .brand-mark {
  width: 44px;
  height: 44px;
}

.footer-brand__link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-text);
}

.footer-brand__link:hover {
  color: var(--color-text);
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--color-text);
  display: block;
}

.footer-trust {
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--color-text-2);
  max-width: 32em;
}

.footer-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--color-ok);
}

.footer-status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-ok);
  animation: brandPulse 2.4s infinite;
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: 1.125rem;
}

.footer-heading::before {
  content: "";
  width: 14px;
  height: 2px;
  background: var(--color-accent);
  transform: skewX(-40deg);
  flex: none;
}

.footer-links {
  display: grid;
  gap: 0.5rem;
}

.footer-links a {
  display: inline-block;
  color: var(--color-text-2);
  font-size: 0.875rem;
  transition: color var(--transition), transform var(--transition), padding-left var(--transition);
}

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

.footer-contact {
  display: grid;
  gap: 1rem;
}

.footer-contact li {
  display: grid;
  gap: 0.25rem;
}

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.footer-contact__text,
.footer-contact a {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-text-2);
  word-break: break-all;
}

.footer-contact a:hover {
  color: var(--color-accent-2);
}

.footer-bottom {
  border-top: 1px solid rgba(168, 178, 209, 0.14);
  padding-block: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-2);
}

.footer-bottom a {
  color: var(--color-text-2);
}

.footer-bottom a:hover {
  color: var(--color-accent-2);
}

.footer-bottom p {
  white-space: nowrap;
}

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  inset-inline-end: 1.25rem;
  inset-block-end: 1.25rem;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 107, 53, 0.5);
  color: var(--color-accent);
  box-shadow: var(--shadow);
  transition: background var(--transition), color var(--transition), transform var(--transition), border-color var(--transition);
  z-index: 900;
}

.back-to-top:hover {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
  transform: translateY(-4px);
}

.back-to-top[hidden] {
  display: none;
}

/* ---------- Scroll reveal ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

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

@media (prefers-reduced-motion: reduce) {
  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .header-action__label {
    display: none;
  }

  .header-action {
    padding: 0.5rem;
  }
}

@media (max-width: 768px) {
  .site-header__inner {
    gap: 0.625rem;
  }

  .brand-text strong {
    font-size: 1rem;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    background: rgba(10, 25, 47, 0.98);
    border-bottom: 1px solid rgba(168, 178, 209, 0.16);
    box-shadow: 0 20px 40px rgba(2, 12, 27, 0.5);
    transition: max-height 0.3s ease, visibility 0.3s ease;
  }

  .site-nav[data-open] {
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.75rem;
  }

  .site-nav__item {
    border-bottom: 1px dashed rgba(136, 146, 176, 0.18);
  }

  .site-nav__item:last-child {
    border-bottom: none;
  }

  .site-nav__link {
    padding: 0.875rem 0.75rem;
    font-size: 1rem;
    border-radius: 8px;
  }

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

  .site-nav__link[aria-current="page"] {
    background: rgba(255, 107, 53, 0.14);
    border-left: 3px solid var(--color-accent);
    border-radius: 0 8px 8px 0;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 10px;
    border: 1px solid rgba(168, 178, 209, 0.2);
    background: rgba(255, 107, 53, 0.08);
    transition: border-color var(--transition), background var(--transition);
  }

  .nav-toggle:hover {
    border-color: var(--color-accent);
    background: rgba(255, 107, 53, 0.16);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2rem;
    padding-block: 2.5rem 2rem;
  }

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

  .section {
    padding-block: 2.5rem;
  }
}

@media (max-width: 420px) {
  .site-header__inner {
    gap: 0.375rem;
  }

  .header-action {
    padding: 0.375rem;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
    border-radius: 10px;
  }

  .brand-mark__svg {
    width: 24px;
    height: 24px;
  }

  .brand-text strong {
    font-size: 0.9375rem;
  }

  .brand-text small {
    font-size: 0.5625rem;
  }

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

  .footer-bottom {
    justify-content: center;
    text-align: center;
  }
}