/* ==========================================================
   非凡体育 /assets/site.css
   全站共享样式：Reset、变量、排版、页头、页脚、基础组件
   ========================================================== */

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

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

/* ---------- 2. CSS Variables ---------- */
:root {
  --c-primary: #FF6B35;
  --c-accent: #FF4500;
  --c-deep: #0F1F3D;
  --c-gold: #FFC849;
  --c-bg: #F7F8FA;
  --c-blue: #E8EFF8;
  --c-ink: #1A1A2E;
  --c-muted: #6C7A8A;
  --c-white: #FFFFFF;

  --font-title: "Noto Sans CJK SC Heavy", "Source Han Sans SC Heavy", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans CJK SC Regular", "Source Han Sans SC Regular", "PingFang SC", "Microsoft YaHei", sans-serif;

  --r-card: 20px;
  --r-pill: 999px;
  --shadow-card: 0 8px 30px rgba(15, 31, 61, 0.08);
  --shadow-lift: 0 16px 40px rgba(15, 31, 61, 0.16);

  --header-top: 16px;
  --header-h: 64px;
  --body-pad-top: calc(var(--header-top) + var(--header-h) + 32px);
  --max-width: 1200px;
  --ease: 0.25s ease;
}

/* ---------- 3. Base Elements ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--c-ink);
  background: var(--c-bg);
  padding-top: var(--body-pad-top);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-title);
  line-height: 1.25;
  color: var(--c-deep);
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(36px, 6vw, 60px);
  font-weight: 900;
  line-height: 1.15;
}

h2 {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 900;
}

h3 {
  font-size: 24px;
  font-weight: 800;
}

p {
  line-height: 1.7;
}

a {
  color: var(--c-primary);
  text-decoration: none;
  transition: color var(--ease);
}

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

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

ul,
ol {
  list-style: none;
}

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

/* ---------- 4. Focus & Selection & Reduced Motion ---------- */
:focus-visible {
  outline: 3px solid var(--c-primary);
  outline-offset: 2px;
}

.skip-link:focus-visible,
.main-nav__link:focus-visible,
.site-footer__list a:focus-visible {
  outline: 2px solid var(--c-gold);
  outline-offset: 2px;
}

::selection {
  background: var(--c-primary);
  color: var(--c-white);
}

@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;
  }
}

/* ---------- 5. Layout Helpers ---------- */
#main-content {
  scroll-margin-top: calc(var(--body-pad-top) + 8px);
}

.content-wrap {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: 56px;
}

.section--narrow {
  max-width: 780px;
  margin-inline: auto;
  padding-inline: 24px;
}

.section__label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--c-primary);
  margin-bottom: 14px;
  white-space: nowrap;
}

.section__label::before {
  content: "";
  width: 28px;
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-gold));
  flex-shrink: 0;
}

.section__title {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 16px;
  color: var(--c-deep);
}

.section__title--display {
  font-size: clamp(40px, 7vw, 60px);
  line-height: 1.12;
}

.section__lead {
  font-size: 17px;
  color: var(--c-muted);
  max-width: 640px;
  line-height: 1.75;
}

.text-small {
  font-size: 14px;
  color: var(--c-muted);
}

/* ---------- 6. Skip Link ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 16px;
  z-index: 1100;
  padding: 10px 22px;
  background: var(--c-primary);
  color: var(--c-white);
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--r-pill);
  box-shadow: 0 6px 20px rgba(255, 69, 0, 0.4);
  transform: translateY(-200%);
  transition: transform var(--ease), background-color var(--ease);
  pointer-events: none;
}

.skip-link:focus-visible {
  transform: translateY(0);
  pointer-events: auto;
  background: var(--c-accent);
}

/* ---------- 7. Site Header ---------- */
.site-header {
  position: fixed;
  top: var(--header-top);
  left: 0;
  right: 0;
  z-index: 1000;
  padding-inline: 20px;
  pointer-events: none;
}

.site-header__inner {
  position: relative;
  max-width: var(--max-width);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 14px 10px 12px;
  background: rgba(15, 31, 61, 0.88);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--r-pill);
  box-shadow: 0 12px 40px rgba(15, 31, 61, 0.32);
  pointer-events: auto;
}

/* Brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  color: var(--c-white);
}

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

.brand__mark {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-primary) 48%, var(--c-gold) 52%, var(--c-gold) 100%);
  font-family: var(--font-title);
  font-size: 18px;
  font-weight: 900;
  color: var(--c-white);
  box-shadow: 0 4px 14px rgba(255, 107, 53, 0.45);
  overflow: hidden;
}

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

.brand__name {
  font-family: var(--font-title);
  font-size: 18px;
  font-weight: 900;
  color: var(--c-white);
  letter-spacing: 0.06em;
  line-height: 1.3;
}

.brand__tagline {
  font-family: var(--font-body);
  font-size: 11px;
  color: rgba(255, 255, 255, 0.56);
  letter-spacing: 0.08em;
  line-height: 1.3;
  white-space: nowrap;
}

/* Main Nav — Desktop */
.main-nav {
  display: flex;
  align-items: center;
}

.main-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav__link {
  display: inline-block;
  padding: 10px 16px;
  border-radius: var(--r-pill);
  color: rgba(255, 255, 255, 0.85);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  transition: background-color var(--ease), color var(--ease), box-shadow var(--ease);
}

.main-nav__link:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--c-white);
}

.main-nav__link[aria-current="page"] {
  background: var(--c-primary);
  color: var(--c-white);
  box-shadow: 0 4px 14px rgba(255, 107, 53, 0.4);
}

.main-nav__link[aria-current="page"]:hover {
  background: var(--c-accent);
  color: var(--c-white);
}

/* Mobile Nav Toggle */
.nav-toggle {
  display: none;
  position: relative;
  z-index: 2;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: 50%;
  transition: background-color var(--ease);
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
}

.nav-toggle__line {
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-white);
  transition: transform 0.3s ease, opacity 0.3s ease, width 0.2s ease, background-color 0.2s ease;
}

.nav-toggle__line:nth-child(2) {
  width: 14px;
  background: var(--c-gold);
}

.nav-toggle:hover .nav-toggle__line:nth-child(2) {
  width: 22px;
}

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

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

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

/* ---------- 8. Mobile Nav States ---------- */
@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
  }

  .main-nav {
    position: absolute;
    top: calc(100% + 12px);
    left: 8px;
    right: 8px;
    display: block;
    background: rgba(15, 31, 61, 0.97);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 20px;
    padding: 12px;
    box-shadow: 0 24px 60px rgba(15, 31, 61, 0.45);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px) scale(0.98);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0s linear 0.25s;
  }

  .main-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0s linear 0s;
  }

  .main-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .main-nav__link {
    display: block;
    padding: 13px 20px;
    border-radius: 14px;
    font-size: 15px;
  }

  .main-nav__link[aria-current="page"] {
    background: var(--c-primary);
  }
}

@media (max-width: 520px) {
  .brand__tagline {
    display: none;
  }

  .site-header {
    padding-inline: 12px;
  }

  .site-header__inner {
    padding: 8px 10px;
  }
}

/* ---------- 9. Scroll Progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  border-radius: 0 3px 3px 0;
  background: linear-gradient(90deg, var(--c-primary), var(--c-gold));
  z-index: 1200;
  pointer-events: none;
}

/* ---------- 10. Site Footer ---------- */
.site-footer {
  background: var(--c-deep);
  color: rgba(255, 255, 255, 0.78);
  margin-top: 80px;
  position: relative;
}

.site-footer::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-gold), var(--c-accent));
}

.site-footer__inner {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding: 64px 24px 28px;
}

.site-footer__top {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1.1fr 0.8fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.site-footer__brand-block {
  min-width: 0;
}

.brand--footer .brand__mark {
  box-shadow: 0 4px 14px rgba(255, 200, 73, 0.3);
}

.brand--footer .brand__name {
  font-size: 20px;
}

.site-footer__note {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.55);
}

.site-footer__heading {
  position: relative;
  padding-left: 14px;
  font-family: var(--font-title);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--c-white);
  margin-bottom: 18px;
}

.site-footer__heading::before {
  content: "";
  position: absolute;
  left: 0;
  top: 2px;
  bottom: 2px;
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--c-primary), var(--c-gold));
}

.site-footer__list {
  display: grid;
  gap: 10px;
}

.site-footer__list a {
  display: inline-block;
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
  line-height: 1.5;
  transition: color var(--ease), transform 0.2s ease;
}

.site-footer__list a:hover {
  color: var(--c-primary);
  transform: translateX(3px);
}

.site-footer__contact-item {
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
  line-height: 1.6;
  word-break: break-all;
}

.site-footer__response-note {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.4);
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 24px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.46);
}

.site-footer__copyright {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.46);
}

.site-footer__icp {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.46);
}

/* Footer Responsive */
@media (max-width: 960px) {
  .site-footer__top {
    grid-template-columns: 1fr 1fr;
    gap: 40px 32px;
  }
}

@media (max-width: 560px) {
  .site-footer__top {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .site-footer__inner {
    padding-top: 48px;
  }

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

/* ---------- 11. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--r-pill);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  border: 2px solid transparent;
  transition: background-color var(--ease), border-color var(--ease), transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  text-decoration: none;
}

.btn:focus-visible {
  outline: 3px solid var(--c-gold);
  outline-offset: 3px;
}

.btn--primary {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: var(--c-white);
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.3);
}

.btn--primary:hover {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-white);
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(255, 69, 0, 0.35);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(15, 31, 61, 0.25);
  color: var(--c-deep);
}

.btn--ghost:hover {
  background: var(--c-blue);
  border-color: var(--c-deep);
  color: var(--c-deep);
  transform: translateY(-2px);
}

/* ---------- 12. Cards ---------- */
.card {
  background: var(--c-white);
  border: 1px solid rgba(15, 31, 61, 0.04);
  border-radius: var(--r-card);
  padding: 32px;
  box-shadow: var(--shadow-card);
}

.card--blue {
  background: var(--c-blue);
  border-color: transparent;
}

.card--dark {
  background: var(--c-deep);
  border-color: transparent;
  color: rgba(255, 255, 255, 0.85);
}

.card--dark h3,
.card--dark h4 {
  color: var(--c-white);
}

/* ---------- 13. Stats ---------- */
.stat {
  background: var(--c-white);
  border-radius: var(--r-card);
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
  border-left: 5px solid var(--c-primary);
  position: relative;
}

.stat--gold {
  border-left-color: var(--c-gold);
}

.stat__number {
  font-family: var(--font-title);
  font-size: clamp(40px, 5vw, 60px);
  font-weight: 900;
  line-height: 1;
  color: var(--c-deep);
  letter-spacing: -0.02em;
}

.stat--gold .stat__number {
  color: var(--c-primary);
}

.stat__label {
  margin-top: 10px;
  font-size: 14px;
  color: var(--c-muted);
}

/* ---------- 14. Tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  border-radius: var(--r-pill);
  background: var(--c-blue);
  color: var(--c-deep);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.4;
  white-space: nowrap;
}

.tag--gold {
  background: var(--c-gold);
  color: var(--c-deep);
}

.tag--primary {
  background: rgba(255, 107, 53, 0.14);
  color: var(--c-primary);
}

/* ---------- 15. Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding-block: 16px;
  font-size: 14px;
  color: var(--c-muted);
}

.breadcrumb a {
  color: var(--c-muted);
  text-decoration: none;
  transition: color var(--ease);
}

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

.breadcrumb__sep {
  color: rgba(15, 31, 61, 0.3);
  user-select: none;
}

/* ---------- 16. Grid ---------- */
.grid {
  display: grid;
  gap: 24px;
}

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

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

@media (max-width: 960px) {
  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- 17. Image Ratio ---------- */
.image-ratio {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: var(--r-card);
  background: var(--c-blue);
}

.image-ratio--4-3 {
  aspect-ratio: 4 / 3;
}

.image-ratio--square {
  aspect-ratio: 1 / 1;
}

.image-ratio img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 18. Decorative Diagonal Line ---------- */
.diag-line {
  display: block;
  width: min(200px, 100%);
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-gold));
  transform: rotate(-8deg);
  opacity: 0.7;
}

/* ---------- 19. Scroll Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
    will-change: auto;
  }
}