/* ==========================================================================
   博奥体育APP · 全站共享 Site Kit
   文件位置 /assets/site.css
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: 'Roboto', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  color: #FFFFFF;
  background-color: #0B1E3A;
  background-image: radial-gradient(ellipse at 75% -20%, rgba(255, 107, 53, 0.07), transparent 60%);
  min-height: 100vh;
  padding-top: 72px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

ul,
ol {
  list-style: none;
}

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

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

:focus-visible {
  outline: 2px solid #FF6B35;
  outline-offset: 3px;
  border-radius: 2px;
}

::selection {
  background: #FF6B35;
  color: #0B1E3A;
}

/* ---------- 2. CSS 变量 ---------- */
:root {
  --c-primary: #0B1E3A;
  --c-primary-deep: #060E1F;
  --c-accent: #FF6B35;
  --c-accent-pale: #FFD2B5;
  --c-white: #FFFFFF;
  --c-secondary: #A0AEC0;
  --c-glass-light: rgba(255, 255, 255, 0.08);
  --c-glass-medium: rgba(255, 255, 255, 0.16);
  --c-surface: #16233B;
  --c-success: #2DD4BF;
  --c-warning: #FACC15;

  --font-headline: 'Arial Black', 'Impact', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Roboto', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;

  --container-max: 1320px;
  --header-height: 72px;
  --radius: 14px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
}

/* ---------- 3. 排版基准 ---------- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-headline);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.section-number {
  font-family: var(--font-headline);
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 900;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 2px var(--c-accent);
  letter-spacing: -0.02em;
  display: inline-block;
}

.section-title {
  font-family: var(--font-headline);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--c-white);
  text-transform: uppercase;
  margin-top: 0.5rem;
}

.section {
  padding-block: clamp(3rem, 8vw, 5rem);
}

#main-content {
  min-height: 60vh;
  scroll-margin-top: calc(var(--header-height) + 1rem);
}

/* ---------- 4. 容器 ---------- */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 3vw, 2rem);
}

/* ---------- 5. 无障碍跳转 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  background: var(--c-accent);
  color: var(--c-white);
  font-weight: 700;
  padding: 0.875rem 1.5rem;
  border-radius: 0 0 12px 0;
  transform: translateY(-200%);
  transition: transform 0.3s ease;
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.9375rem;
  line-height: 1;
  padding: 0.85rem 1.75rem;
  border-radius: 8px;
  white-space: nowrap;
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    background var(--transition),
    border-color var(--transition);
}

.btn-accent {
  background: var(--c-accent);
  color: var(--c-white);
  box-shadow: 0 4px 18px rgba(255, 107, 53, 0.35);
}

.btn-accent:hover {
  background: #FF8255;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.45);
}

.btn-ghost {
  background: var(--c-glass-light);
  border: 1px solid var(--c-glass-medium);
  color: var(--c-white);
}

.btn-ghost:hover {
  background: var(--c-glass-medium);
  border-color: rgba(255, 255, 255, 0.24);
  transform: translateY(-2px);
}

/* ---------- 7. 头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(11, 30, 58, 0.72);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition:
    background var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.site-header[data-scrolled] {
  background: rgba(11, 30, 58, 0.96);
  border-bottom-color: rgba(255, 107, 53, 0.28);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: 1rem;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.brand-mark {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--c-accent), var(--c-accent-pale));
  clip-path: polygon(12% 0, 100% 0, 88% 100%, 0 100%);
  position: relative;
  display: inline-block;
  flex-shrink: 0;
  transition: transform var(--transition);
}

.brand-mark::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-35%, -50%);
  width: 0;
  height: 0;
  border-left: 10px solid var(--c-primary);
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
}

.site-brand:hover .brand-mark,
.footer-brand__logo:hover .brand-mark {
  transform: rotate(-8deg) scale(1.05);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-text__name {
  font-family: var(--font-headline);
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.brand-text__sub {
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  color: var(--c-secondary);
  text-transform: uppercase;
  margin-top: 0.25rem;
  white-space: nowrap;
}

/* ---------- 8. 导航 ---------- */
.site-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: inline-block;
  padding: 0.5rem 0.9rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--c-secondary);
  border-radius: 6px;
  position: relative;
  transition:
    color var(--transition),
    background var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0.15rem;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--c-accent);
  border-radius: 2px;
  transition: width var(--transition);
}

.nav-link:hover {
  color: var(--c-white);
  background: var(--c-glass-light);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  width: 60%;
}

.nav-link[aria-current="page"] {
  color: var(--c-white);
  font-weight: 700;
}

.nav-cta {
  margin-left: 0.5rem;
}

/* ---------- 9. 移动汉堡按钮 ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: 8px;
  background: var(--c-glass-light);
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: background var(--transition);
}

.nav-toggle:hover {
  background: var(--c-glass-medium);
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--c-white);
  border-radius: 2px;
  transition:
    transform var(--transition),
    opacity var(--transition);
}

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

/* ---------- 10. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--c-primary-deep);
  border-top: 1px solid var(--c-glass-light);
  margin-top: var(--space-xl);
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-accent) 0%, rgba(255, 107, 53, 0.15) 70%, transparent 100%);
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr 1.3fr;
  gap: clamp(2rem, 5vw, 4rem);
  padding-top: var(--space-lg);
  padding-bottom: var(--space-md);
}

.footer-brand__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.footer-trust {
  color: var(--c-secondary);
  font-size: 0.9375rem;
  line-height: 1.8;
  max-width: 38ch;
  margin-bottom: 1.5rem;
}

.footer-cert {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.footer-cert__item {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  color: var(--c-secondary);
  background: var(--c-glass-light);
  padding: 0.375rem 0.875rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.footer-cert__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-success);
  box-shadow: 0 0 6px rgba(45, 212, 191, 0.5);
}

.footer-col__title {
  font-family: var(--font-headline);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1.25rem;
  position: relative;
  padding-left: 0.875rem;
}

.footer-col__title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.15em;
  bottom: 0.15em;
  width: 3px;
  background: var(--c-accent);
  border-radius: 2px;
}

.footer-links li + li {
  margin-top: 0.625rem;
}

.footer-links a {
  display: inline-block;
  color: var(--c-secondary);
  font-size: 0.9375rem;
  transition:
    color var(--transition),
    padding-left var(--transition);
}

.footer-links a:hover {
  color: var(--c-white);
  padding-left: 0.25rem;
}

.contact-list {
  margin-top: 0;
}

.contact-list__item {
  padding-bottom: 0.875rem;
  margin-bottom: 0.875rem;
  border-bottom: 1px solid var(--c-glass-light);
}

.contact-list__item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.contact-list__label {
  display: block;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--c-secondary);
  margin-bottom: 0.25rem;
}

.contact-list__value {
  display: block;
  color: var(--c-white);
  font-size: 0.9375rem;
  line-height: 1.5;
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-block: 1.25rem;
}

.footer-copy {
  font-size: 0.8125rem;
  color: var(--c-secondary);
}

.footer-icp {
  font-size: 0.8125rem;
  color: var(--c-secondary);
  letter-spacing: 0.04em;
}

/* ---------- 11. 面包屑 ---------- */
.breadcrumb {
  padding-block: 0.5rem;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--c-secondary);
}

.breadcrumb__link {
  transition: color var(--transition);
}

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

.breadcrumb__sep {
  color: var(--c-accent);
  font-weight: 700;
}

.breadcrumb__item[aria-current="page"] {
  color: var(--c-white);
  font-weight: 500;
}

/* ---------- 12. 组件基础：玻璃卡片 / 图片框 / 标签 ---------- */
.glass-card {
  position: relative;
  background: var(--c-glass-light);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition:
    transform var(--transition),
    background var(--transition),
    border-color var(--transition);
}

.glass-card:hover {
  background: var(--c-glass-medium);
  border-color: rgba(255, 255, 255, 0.14);
  transform: translateY(-3px);
}

.img-frame {
  position: relative;
  aspect-ratio: var(--aspect, 16 / 9);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--c-surface);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.img-frame::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 26px;
  height: 26px;
  background: var(--c-accent);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
  z-index: 2;
  opacity: 0.85;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  background: var(--c-glass-light);
  color: var(--c-secondary);
  border: 1px solid rgba(255, 255, 255, 0.06);
  white-space: nowrap;
}

.tag--accent {
  background: rgba(255, 107, 53, 0.15);
  color: var(--c-accent);
  border-color: rgba(255, 107, 53, 0.2);
}

.tag--warning {
  background: rgba(250, 204, 21, 0.12);
  color: var(--c-warning);
  border-color: rgba(250, 204, 21, 0.18);
}

.tag--success {
  background: rgba(45, 212, 191, 0.12);
  color: var(--c-success);
  border-color: rgba(45, 212, 191, 0.18);
}

/* ---------- 13. 滚动进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent-pale));
  border-radius: 0 2px 2px 0;
  z-index: 2000;
  pointer-events: none;
  will-change: width;
}

/* ---------- 14. 返回顶部 ---------- */
.btn-back-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--c-accent);
  color: var(--c-white);
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 900;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition:
    opacity var(--transition),
    transform var(--transition),
    visibility var(--transition),
    box-shadow var(--transition);
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.4);
}

.btn-back-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.btn-back-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(255, 107, 53, 0.55);
}

/* ---------- 15. 滚动显现 ---------- */
.js-enabled [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.js-enabled [data-reveal="shown"] {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 16. 响应式：平板 ---------- */
@media (max-width: 1024px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(11, 30, 58, 0.95);
    -webkit-backdrop-filter: blur(22px);
    backdrop-filter: blur(22px);
    border-bottom: 1px solid rgba(255, 107, 53, 0.2);
    padding: 1rem clamp(1rem, 4vw, 2rem) 1.5rem;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition:
      opacity var(--transition),
      transform var(--transition),
      visibility var(--transition);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }

  .site-nav[data-open] {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.125rem;
  }

  .nav-link {
    display: block;
    padding: 0.85rem 0.75rem;
    font-size: 1rem;
    border-radius: 8px;
  }

  .nav-link::after {
    display: none;
  }

  .nav-link:hover {
    background: var(--c-glass-light);
  }

  .nav-cta {
    margin-top: 1rem;
    margin-left: 0;
    width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    padding-top: var(--space-lg);
  }

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

  .footer-trust {
    max-width: 60ch;
  }
}

/* ---------- 17. 响应式：手机 ---------- */
@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  body {
    padding-top: 64px;
  }

  .brand-text__name {
    font-size: 1.125rem;
  }

  .brand-text__sub {
    font-size: 0.5625rem;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .brand-mark::after {
    border-left-width: 8px;
    border-top-width: 5px;
    border-bottom-width: 5px;
  }

  .header-inner {
    min-height: 64px;
  }

  .nav-toggle {
    width: 40px;
    height: 40px;
    padding: 9px;
  }

  .btn-back-top {
    bottom: 1.25rem;
    right: 1.25rem;
    width: 44px;
    height: 44px;
  }

  .site-footer {
    margin-top: var(--space-lg);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

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

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.375rem;
  }
}

/* ---------- 18. 缩小范围：小手机 ---------- */
@media (max-width: 480px) {
  .brand-text__sub {
    display: none;
  }

  .site-brand {
    gap: 0.5rem;
  }

  .nav-toggle {
    width: 38px;
    height: 38px;
    padding: 8px;
  }
}

/* ---------- 19. 动效降级 ---------- */
@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;
    transition-delay: 0ms !important;
  }

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

  .btn-back-top {
    transition: none;
  }

  .site-header,
  .site-nav,
  .nav-toggle__bar {
    transition: none;
  }
}