/* ============================================
   安博体育 Anbo Sport — 全站共享样式
   /assets/site.css
   ============================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: "HarmonyOS Sans SC", "MiSans", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: #111111;
  background: #ffffff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  border: 0;
  background: none;
  cursor: pointer;
  color: inherit;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "HarmonyOS Sans SC", "MiSans", "Source Han Sans SC Heavy", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #0a2540;
  line-height: 1.25;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

#main-content {
  flex: 1 0 auto;
  width: 100%;
  display: block;
}

/* ---------- CSS Variables ---------- */
:root {
  --color-primary: #0a2540;
  --color-accent: #ff6b00;
  --color-white: #ffffff;
  --color-light-gray: #f5f5f5;
  --color-mid-gray: #888888;
  --color-black: #111111;
  --color-dark-gray: #333333;
  --color-pale-blue: #e8f0fe;

  --font-heading: "HarmonyOS Sans SC", "MiSans", "Source Han Sans SC Heavy", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "HarmonyOS Sans SC", "MiSans", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Cascadia Code", Consolas, "Liberation Mono", Menlo, monospace;

  --container-max: 1200px;
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Focus & A11y ---------- */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

.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;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 3000;
  padding: 12px 24px;
  background: var(--color-accent);
  color: var(--color-white);
  font-weight: 700;
  border-radius: 999px;
  box-shadow: 0 4px 20px rgba(10, 37, 64, 0.3);
  transform: translateY(-300%);
  transition: transform 0.25s ease;
}
.skip-link:focus-visible {
  transform: translateY(0);
}

/* ---------- Scroll Progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 2000;
  height: 3px;
  width: 0;
  background: var(--color-accent);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ---------- Header / Floating Capsule ---------- */
.site-header {
  position: fixed;
  top: 16px;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 16px;
  pointer-events: none;
}

.nav-capsule {
  position: relative;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 14px 10px 24px;
  background: rgba(10, 37, 64, 0.96);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  box-shadow: 0 10px 36px rgba(10, 37, 64, 0.28);
  pointer-events: auto;
  transition: padding 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}

.site-header.is-scrolled .nav-capsule {
  padding-top: 6px;
  padding-bottom: 6px;
  box-shadow: 0 6px 24px rgba(10, 37, 64, 0.34);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 107, 0, 0.14);
  border: 1px solid rgba(255, 107, 0, 0.4);
  transition: background 0.2s ease;
}

.brand:hover .brand-logo {
  background: rgba(255, 107, 0, 0.24);
}

.brand-text {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--color-white);
  white-space: nowrap;
}

/* ---------- Navigation ---------- */
.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: inline-block;
  padding: 8px 15px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  border-radius: 999px;
  white-space: nowrap;
  transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
}

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

/* ---------- Mobile Nav Toggle ---------- */
.nav-toggle {
  display: none;
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.2s ease;
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
}

.nav-toggle-icon {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: background 0.2s ease;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform 0.3s ease;
}

.nav-toggle-icon::before {
  transform: translateY(-6px);
}

.nav-toggle-icon::after {
  transform: translateY(6px);
}

.nav-toggle.is-active .nav-toggle-icon {
  background: transparent;
}

.nav-toggle.is-active .nav-toggle-icon::before {
  transform: rotate(45deg);
}

.nav-toggle.is-active .nav-toggle-icon::after {
  transform: rotate(-45deg);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.8);
  margin-top: auto;
  position: relative;
}

.footer-accent {
  height: 4px;
  background: var(--color-accent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding: 64px 0 48px;
}

.brand--footer .brand-logo {
  width: 40px;
  height: 40px;
}

.brand--footer .brand-text {
  font-size: 24px;
}

.footer-trust {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.8;
  max-width: 420px;
  color: rgba(255, 255, 255, 0.58);
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 3px;
  color: var(--color-accent);
  margin-bottom: 18px;
}

.footer-links li + li {
  margin-top: 10px;
}

.footer-links a {
  display: inline-block;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.78);
  transition: color 0.2s ease;
}

.footer-links a::before {
  content: "→";
  display: inline-block;
  color: var(--color-accent);
  margin-right: 8px;
  font-family: var(--font-mono);
  transition: transform 0.2s ease;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--color-white);
}

.footer-links a:hover::before {
  transform: translateX(3px);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 24px 0 32px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px 24px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-contact {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-meta a {
  color: rgba(255, 255, 255, 0.55);
  transition: color 0.2s ease;
}

.footer-meta a:hover,
.footer-meta a:focus-visible {
  color: var(--color-accent);
}

.footer-divider {
  color: rgba(255, 255, 255, 0.25);
}

/* ---------- Back to Top ---------- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 28px;
  z-index: 900;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 8px 24px rgba(10, 37, 64, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  line-height: 1;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s, background 0.2s ease;
}

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

.back-to-top:hover,
.back-to-top:focus-visible {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 30px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  border-radius: 999px;
  border: 2px solid transparent;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #e05f00;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-invert {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-invert:hover,
.btn-invert:focus-visible {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.5px;
  color: var(--color-mid-gray);
}

.breadcrumb a {
  color: var(--color-mid-gray);
  transition: color 0.2s ease;
}

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

.breadcrumb-sep {
  color: var(--color-mid-gray);
}

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

/* ---------- Content Areas ---------- */
.content-area {
  padding: 56px 0 88px;
}

.content-area--gray {
  background: var(--color-light-gray);
}

.content-area--dark {
  background: var(--color-primary);
  color: var(--color-white);
}

.content-area--dark .section-title {
  color: var(--color-white);
}

.content-area--dark .section-desc {
  color: rgba(255, 255, 255, 0.68);
}

/* ---------- Page Hero (inner pages) ---------- */
.page-hero {
  position: relative;
  overflow: hidden;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 160px 0 72px;
}

.page-hero::before {
  content: "";
  position: absolute;
  top: -60%;
  right: -4%;
  width: 360px;
  height: 220%;
  background: rgba(255, 107, 0, 0.08);
  transform: rotate(14deg);
  pointer-events: none;
}

.page-hero::after {
  content: "";
  position: absolute;
  left: 10%;
  bottom: -90px;
  width: 220px;
  height: 220px;
  border: 2px dashed rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  pointer-events: none;
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

.page-hero-index {
  position: absolute;
  top: 142px;
  right: 24px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--color-accent);
  background: rgba(10, 37, 64, 0.55);
  border: 1px solid rgba(255, 107, 0, 0.45);
  border-radius: 999px;
  pointer-events: none;
}

.page-hero-title {
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 900;
  letter-spacing: 1px;
  color: var(--color-white);
}

.page-hero-sub {
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.7;
  max-width: 560px;
  color: rgba(255, 255, 255, 0.72);
}

/* ---------- Section Headings ---------- */
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px 24px;
  margin-bottom: 32px;
}

.section-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--color-accent);
  background: rgba(255, 107, 0, 0.08);
  border: 1px solid rgba(255, 107, 0, 0.3);
  border-radius: 999px;
  padding: 4px 14px;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(26px, 3.2vw, 38px);
  font-weight: 900;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.section-desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-dark-gray);
  max-width: 640px;
}

/* ---------- Cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.card {
  position: relative;
  background: var(--color-white);
  border: 1px solid #e0e0e0;
  border-top: 3px solid var(--color-primary);
  border-radius: 6px;
  padding: 28px 24px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

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

.card-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--color-accent);
  background: rgba(255, 107, 0, 0.08);
  border: 1px solid rgba(255, 107, 0, 0.28);
  border-radius: 999px;
  padding: 3px 12px;
  margin-bottom: 14px;
}

.card-title {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.card-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-dark-gray);
}

/* ---------- Boards (exhibit panels) ---------- */
.board {
  position: relative;
  background: var(--color-white);
  border: 1px solid #e4e4e4;
  border-top: 3px solid var(--color-primary);
  border-radius: 6px;
  padding: 30px 28px;
}

.board--accent {
  border-top-color: var(--color-accent);
}

.board-index {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.board-index::before {
  content: "";
  flex-shrink: 0;
  width: 16px;
  height: 2px;
  background: var(--color-accent);
}

.board-title {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.board-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-dark-gray);
}

/* ---------- Tags & Notice ---------- */
.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--color-accent);
  background: rgba(255, 107, 0, 0.08);
  border: 1px solid rgba(255, 107, 0, 0.3);
  border-radius: 999px;
  padding: 3px 10px;
}

.notice {
  background: var(--color-pale-blue);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 6px 6px 0;
  padding: 16px 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-primary);
}

.panel-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.panel-label::before {
  content: "";
  flex-shrink: 0;
  width: 16px;
  height: 2px;
  background: var(--color-accent);
}

/* ---------- FAQ Accordion ---------- */
.faq-item {
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  background: var(--color-white);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item:hover {
  border-color: var(--color-primary);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  text-align: left;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  background: transparent;
  transition: background 0.2s ease;
}

.faq-question:hover,
.faq-question:focus-visible {
  background: var(--color-light-gray);
}

.faq-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--color-accent);
  position: relative;
}

.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10px;
  height: 2px;
  background: var(--color-accent);
  transform: translate(-50%, -50%);
}

.faq-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  transition: transform 0.3s ease;
}

.faq-item[data-open] .faq-icon::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-smooth);
}

.faq-item[data-open] .faq-answer {
  max-height: 600px;
}

.faq-answer-inner {
  padding: 0 24px 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-dark-gray);
}

.faq-answer-inner p + p {
  margin-top: 8px;
}

/* ---------- Diagonal Overlay ---------- */
.diagonal-overlay {
  position: relative;
  overflow: hidden;
}

.diagonal-overlay::after {
  content: "";
  position: absolute;
  top: -60%;
  right: 6%;
  width: 160px;
  height: 220%;
  background: linear-gradient(to bottom, rgba(255, 107, 0, 0.1), rgba(255, 107, 0, 0.02));
  transform: rotate(16deg);
  pointer-events: none;
}

.diagonal-overlay > * {
  position: relative;
  z-index: 1;
}

/* ---------- Scroll Reveal ---------- */
body.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

body.js-reveal [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 992px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    background: var(--color-primary);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 22px;
    padding: 12px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    display: block;
    padding: 12px 18px;
    font-size: 16px;
    border-radius: 14px;
    text-align: center;
  }

  .nav-link[aria-current="page"] {
    background: var(--color-accent);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px 28px;
    padding: 52px 0 36px;
  }

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

@media (max-width: 768px) {
  .site-header {
    top: 10px;
    padding: 0 12px;
  }

  .nav-capsule {
    padding-left: 18px;
    padding-right: 10px;
  }

  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .content-area {
    padding: 40px 0 64px;
  }

  .page-hero {
    padding: 132px 0 48px;
  }

  .page-hero-index {
    top: 118px;
    right: 16px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .breadcrumb {
    padding: 16px 0;
    font-size: 12px;
  }
}

@media (max-width: 420px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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

  .brand-text {
    font-size: 20px;
  }
}

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

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