/* ==========================================================================
   星空体育 Nebula Sports — 共享样式表
   路径：/assets/site.css
   覆盖：重置、变量、排版、头部、页脚、通用组件
   ========================================================================== */

/* ---------- 重置与基础 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  background-color: var(--color-space-black);
  color: var(--color-text-secondary);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

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

a {
  color: var(--color-accent-cyan);
  text-underline-offset: 0.2em;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-text-primary);
}

ul, ol {
  list-style: none;
}

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

::selection {
  background: var(--color-accent-orange);
  color: var(--color-space-black);
}

/* ---------- CSS 变量 ---------- */
:root {
  --color-space-black: #0B0A1A;
  --color-space-dark: #0D0D1A;
  --color-space-navy: #1B1035;
  --color-space-violet: #3D1E6D;
  --color-accent-orange: #FF6B35;
  --color-accent-cyan: #00E5FF;
  --color-text-primary: #E0E0FF;
  --color-text-secondary: #B8B8D0;
  --color-text-muted: #8A8AA8;
  --color-border: rgba(61, 30, 109, 0.45);

  --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Source Han Sans SC', sans-serif;
  --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Source Han Sans SC', sans-serif;
  --font-mono: 'JetBrains Mono', 'Roboto Mono', Consolas, 'Courier New', monospace;

  --transition-fast: 0.2s ease;
  --transition-base: 0.35s ease;
  --header-height: 72px;
  --header-height-scrolled: 60px;
}

/* ---------- 通用工具类 ---------- */
.visually-hidden {
  position: absolute !important;
  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;
}

.skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: 1200;
  background: var(--color-accent-orange);
  color: var(--color-space-black);
  font-weight: 700;
  text-decoration: none;
  padding: 0.6rem 1.2rem;
  border-radius: 0 0 6px 6px;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--color-accent-cyan);
  outline-offset: -2px;
}

.text-cyan { color: var(--color-accent-cyan); }
.text-orange { color: var(--color-accent-orange); }
.text-muted { color: var(--color-text-muted); }

.tilt {
  display: inline-block;
  transform: skewX(-3deg);
}

/* ---------- 通用容器与章节 ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  position: relative;
  padding: 3rem 1.5rem;
}

.section--panel {
  background: var(--color-space-navy);
  border: 1px solid rgba(61, 30, 109, 0.35);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.35);
  margin: 1.25rem auto;
  max-width: 1180px;
}

.section--gradient {
  background: linear-gradient(135deg, var(--color-space-navy) 0%, var(--color-space-violet) 100%);
}

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

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

@media (min-width: 992px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* ---------- 头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color var(--transition-base), border-color var(--transition-base), backdrop-filter var(--transition-base);
}

.site-header.is-scrolled,
.site-header.has-open-nav {
  background: rgba(11, 10, 26, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom-color: rgba(61, 30, 109, 0.35);
}

.site-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  transition: height var(--transition-base);
}

.site-header.is-scrolled .site-header__inner {
  height: var(--header-height-scrolled);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-text-primary);
  flex-shrink: 0;
}

.site-header__brand-mark {
  position: relative;
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-accent-orange) 0%, var(--color-accent-cyan) 100%);
  clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 100%, 50% 75%, 21% 100%, 32% 57%, 2% 35%, 39% 35%);
  transition: transform var(--transition-base);
}

.site-header__brand:hover .site-header__brand-mark {
  transform: rotate(18deg) scale(1.12);
}

.site-header__brand-mark::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 4px;
  height: 4px;
  background: var(--color-space-black);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.site-header__brand-name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  transform: skewX(-3deg);
  white-space: nowrap;
}

.site-header__nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 10px;
  border: 1px solid rgba(61, 30, 109, 0.6);
  border-radius: 6px;
  background: rgba(11, 10, 26, 0.3);
  transition: border-color var(--transition-fast), background var(--transition-fast);
  flex-shrink: 0;
}

.site-header__nav-toggle:hover {
  border-color: var(--color-accent-cyan);
}

.site-header__nav-toggle[aria-expanded="true"] {
  border-color: var(--color-accent-orange);
}

.site-header__toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.site-header__nav-toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.site-header__nav-toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-header__nav-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.site-header__nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  padding: 0.85rem 0.5rem;
  letter-spacing: 0.02em;
  transition: color var(--transition-fast);
}

.site-header__nav-link::after {
  content: '';
  position: absolute;
  left: 0.5rem;
  right: 100%;
  bottom: 0.2rem;
  height: 2px;
  background: var(--color-accent-orange);
  transition: right var(--transition-fast);
}

.site-header__nav-link:hover {
  color: var(--color-text-primary);
}

.site-header__nav-link:hover::after,
.site-header__nav-link[aria-current="page"]::after {
  right: 0;
}

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

.site-header__nav-index {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--color-accent-orange);
  opacity: 0.8;
}

.site-header__progress {
  position: absolute;
  bottom: -1px;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent-orange), var(--color-accent-cyan));
  z-index: 4;
}

/* 头部移动端抽屉 */
@media (max-width: 991px) {
  .site-header__nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(11, 10, 26, 0.98);
    border-bottom: 1px solid rgba(61, 30, 109, 0.4);
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base);
  }

  .site-header.is-scrolled .site-header__nav {
    top: var(--header-height-scrolled);
  }

  .site-header__nav[data-open] {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .site-header__nav-list {
    padding: 0.5rem 1.5rem 1rem;
  }

  .site-header__nav-item {
    border-bottom: 1px solid rgba(61, 30, 109, 0.25);
  }

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

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

  .site-header__nav-link::after {
    display: none;
  }

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

/* 头部桌面端 */
@media (min-width: 992px) {
  .site-header__nav-toggle {
    display: none;
  }

  .site-header__nav-list {
    flex-direction: row;
    gap: 0.2rem;
  }

  .site-header__nav-link {
    padding: 0.5rem 0.75rem;
  }

  .site-header__nav-link::after {
    left: 0.75rem;
  }
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  background-color: var(--color-space-dark);
  background-image:
    linear-gradient(rgba(61, 30, 109, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61, 30, 109, 0.12) 1px, transparent 1px);
  background-size: 32px 32px;
  border-top: 1px solid rgba(61, 30, 109, 0.5);
  color: var(--color-text-secondary);
  overflow: hidden;
}

.site-footer::before {
  content: '';
  display: block;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent-cyan), var(--color-accent-orange), transparent);
  opacity: 0.6;
}

.site-footer__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 1.5rem 2rem;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.site-footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-text-primary);
  margin-bottom: 0.75rem;
}

.site-footer__brand-mark {
  position: relative;
  width: 26px;
  height: 26px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-accent-orange) 0%, var(--color-accent-cyan) 100%);
  clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 100%, 50% 75%, 21% 100%, 32% 57%, 2% 35%, 39% 35%);
}

.site-footer__brand-mark::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 3px;
  height: 3px;
  background: var(--color-space-dark);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.site-footer__brand-name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.1rem;
  letter-spacing: 0.04em;
  transform: skewX(-3deg);
}

.site-footer__slogan {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-accent-cyan);
  letter-spacing: 0.06em;
  margin-bottom: 0.6rem;
}

.site-footer__trust {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  max-width: 30em;
}

.site-footer__heading {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-accent-orange);
  text-transform: uppercase;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.site-footer__links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

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

.site-footer__contact-item {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 0.3rem;
}

.site-footer__contact-note {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-top: 0.5rem;
  border-left: 2px solid var(--color-accent-cyan);
  padding-left: 0.65rem;
}

.site-footer__bottom {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  border-top: 1px solid rgba(61, 30, 109, 0.3);
  padding-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.site-footer__copyright {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
}

.site-footer__legal a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.8rem;
  transition: color var(--transition-fast);
}

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

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

  .site-footer__block--brand {
    grid-column: 1 / -1;
  }

  .site-footer__bottom {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 992px) {
  .site-footer__grid {
    grid-template-columns: 2fr 1fr 1.2fr;
  }

  .site-footer__block--brand {
    grid-column: auto;
  }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.35rem;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.9rem;
  line-height: 1;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  background: var(--color-accent-orange);
  color: var(--color-space-black);
}

.btn--primary:hover {
  box-shadow: 0 0 24px rgba(255, 107, 53, 0.35);
  color: var(--color-space-black);
}

.btn--ghost {
  border-color: var(--color-accent-cyan);
  color: var(--color-accent-cyan);
  background: transparent;
}

.btn--ghost:hover {
  background: rgba(0, 229, 255, 0.1);
  color: var(--color-accent-cyan);
}

/* ---------- 排版组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-cyan);
}

.eyebrow::before {
  content: '[' attr(data-index) ']';
  color: var(--color-accent-orange);
  font-weight: 700;
  letter-spacing: 0;
}

.page-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.12;
  color: var(--color-text-primary);
  display: inline-block;
  transform: skewX(-3deg);
  letter-spacing: -0.02em;
  margin: 0.8rem 0 1rem;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--color-text-muted);
  padding: 1rem 0;
}

.breadcrumbs a {
  color: var(--color-accent-cyan);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--color-text-primary);
}

.breadcrumbs [aria-current="page"] {
  color: var(--color-text-secondary);
}

.breadcrumbs li::before {
  content: '/';
  margin-right: 0.65rem;
  color: var(--color-text-muted);
}

.breadcrumbs li:first-child::before {
  content: '';
  margin-right: 0;
}

.prose {
  max-width: 46rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

.prose h2 {
  font-size: 1.5rem;
  margin: 2em 0 0.8em;
  color: var(--color-text-primary);
}

.prose h3 {
  font-size: 1.2rem;
  margin: 1.5em 0 0.6em;
  color: var(--color-text-primary);
}

.prose p {
  margin-bottom: 1.2em;
}

.prose a {
  color: var(--color-accent-cyan);
}

.prose ul,
.prose ol {
  margin: 0 0 1.2em 1.4em;
}

.prose ul {
  list-style: square;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: 0.4em;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: rgba(61, 30, 109, 0.35);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  color: var(--color-accent-cyan);
}

/* ---------- 面板、卡片、标签、数据 ---------- */
.panel {
  background: var(--color-space-navy);
  border: 1px solid rgba(61, 30, 109, 0.45);
  padding: 1.5rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.card {
  background: var(--color-space-navy);
  border: 1px solid rgba(61, 30, 109, 0.4);
  padding: 1.5rem;
  position: relative;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 255, 0.35);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.card--data {
  border-top: 3px solid var(--color-accent-cyan);
}

.card--link {
  display: block;
  text-decoration: none;
  color: var(--color-text-primary);
}

.card--link:hover {
  color: var(--color-text-primary);
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  line-height: 1;
  padding: 0.35rem 0.6rem;
  border: 1px solid rgba(0, 229, 255, 0.35);
  border-radius: 2px;
  color: var(--color-accent-cyan);
  white-space: nowrap;
}

.tag--orange {
  border-color: rgba(255, 107, 53, 0.45);
  color: var(--color-accent-orange);
}

.tag--violet {
  border-color: rgba(61, 30, 109, 0.7);
  color: var(--color-text-secondary);
}

.data-number {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--color-accent-cyan);
  letter-spacing: -0.02em;
}

/* ---------- 分割线 ---------- */
.divider {
  height: 1px;
  border: none;
  margin: 2.5rem 0;
  background: linear-gradient(90deg, var(--color-accent-orange), rgba(61, 30, 109, 0.5), transparent);
}

.divider--slant {
  position: relative;
  height: 24px;
  background: transparent;
  border: none;
  margin: 3rem 0;
  overflow: hidden;
}

.divider--slant::after {
  content: '';
  position: absolute;
  left: -10%;
  right: -10%;
  top: 0;
  bottom: 0;
  background:
    repeating-linear-gradient(135deg, rgba(255, 107, 53, 0.35) 0, rgba(255, 107, 53, 0.35) 8px, transparent 8px, transparent 16px),
    repeating-linear-gradient(45deg, rgba(0, 229, 255, 0.3) 0, rgba(0, 229, 255, 0.3) 8px, transparent 8px, transparent 16px);
  opacity: 0.45;
}

/* ---------- 图片容器 ---------- */
.img-shell {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-space-navy) 0%, var(--color-space-violet) 100%);
  border: 1px solid rgba(61, 30, 109, 0.4);
}

.img-shell--16x9 { aspect-ratio: 16 / 9; }
.img-shell--4x3 { aspect-ratio: 4 / 3; }
.img-shell--1x1 { aspect-ratio: 1 / 1; }

.img-shell img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-shell__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}

.img-shell::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(135deg, transparent 42%, rgba(0, 229, 255, 0.08));
}

/* ---------- 滚动显现 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ---------- 焦点可见 ---------- */
:focus-visible {
  outline: 2px solid var(--color-accent-cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline-color: var(--color-accent-orange);
}

/* ---------- 减少动效 ---------- */
@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;
  }

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