/* =========================================================
   悟空体育 — 全站共享样式
   ========================================================= */

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

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}

:root {
  --wk-orange: #FF3D00;
  --wk-orange-soft: #FF6A33;
  --wk-black: #0A0A0A;
  --wk-ink: #141414;
  --wk-silver: #A9A9A9;
  --wk-green: #39FF14;
  --wk-white: #FFFFFF;
  --wk-teal: #004D40;
  --wk-wine: #800020;
  --wk-indigo: #4B0082;
  --wk-text: #E8E8E8;
  --wk-muted: rgba(169,169,169,0.72);
  --wk-border: rgba(169,169,169,0.18);
  --wk-header-h: 72px;
  --wk-header-h-mobile: 60px;
  --wk-content-w: 1200px;
  --font-head: 'DIN Alternate', 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  --font-mono: 'Roboto Mono', 'SF Mono', 'Cascadia Code', 'Consolas', 'Liberation Mono', monospace;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--wk-text);
  background: var(--wk-black);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  padding-top: var(--wk-header-h);
}

body.has-hero {
  padding-top: 0;
}

body.nav-lock {
  overflow: hidden;
}

#main-content {
  min-height: 60vh;
}

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

a {
  color: inherit;
}

button {
  font-family: inherit;
  cursor: pointer;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--wk-green);
  outline-offset: 2px;
}

.btn:focus-visible,
.header-cta:focus-visible,
.back-to-top:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 3px var(--wk-green);
}

/* ---------- 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 12px;
  z-index: 2000;
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 6px 18px;
  background: var(--wk-green);
  color: #052e00;
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform 0.3s;
}

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

/* ---------- 全局页头 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: linear-gradient(180deg, rgba(10,10,10,0.92) 0%, rgba(10,10,10,0.78) 100%);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background 0.4s, border-color 0.4s, box-shadow 0.4s;
}

.site-header.is-scrolled {
  background: rgba(10,10,10,0.98);
  border-bottom-color: rgba(255,61,0,0.3);
  box-shadow: 0 8px 28px rgba(0,0,0,0.35);
}

body.has-hero .site-header:not(.is-scrolled) {
  background: linear-gradient(180deg, rgba(10,10,10,0.75) 0%, rgba(10,10,10,0.28) 65%, rgba(10,10,10,0) 100%);
  border-bottom-color: transparent;
}

.header-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: var(--wk-content-w);
  height: var(--wk-header-h);
  margin-inline: auto;
  padding-inline: 24px;
}

.header-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  text-decoration: none;
  position: relative;
  z-index: 310;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--wk-orange);
  color: var(--wk-white);
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 900;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
  transition: background 0.3s;
}

.header-brand:hover .brand-mark,
.footer-brand:hover .brand-mark {
  background: var(--wk-orange-soft);
}

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

.brand-name {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--wk-white);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  color: var(--wk-orange);
  text-transform: uppercase;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

.header-nav-link {
  display: inline-block;
  position: relative;
  padding: 8px 14px;
  color: rgba(255,255,255,0.7);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.3s;
}

.header-nav-link::after {
  content: '';
  position: absolute;
  left: 10px;
  bottom: 0;
  width: calc(100% - 20px);
  height: 3px;
  background: var(--wk-orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s;
}

.header-nav-link:hover,
.header-nav-link[aria-current="page"] {
  color: var(--wk-white);
}

.header-nav-link:hover::after,
.header-nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  min-height: 38px;
  padding: 7px 18px;
  background: var(--wk-orange);
  color: var(--wk-white);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
  transition: background 0.3s, transform 0.3s, filter 0.3s;
}

.header-cta:hover {
  background: var(--wk-orange-soft);
  transform: translateY(-2px);
  filter: drop-shadow(0 4px 12px rgba(255,61,0,0.4));
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.2);
  padding: 0;
  position: relative;
  z-index: 300;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--wk-white);
  transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle-bar + .nav-toggle-bar {
  margin-top: 5px;
}

.nav-toggle.is-active .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-active .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-active .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.page-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--wk-orange), var(--wk-green));
  transform: scaleX(0);
  transform-origin: left;
  pointer-events: none;
  z-index: 250;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--wk-black);
  border-top: 1px solid rgba(255,61,0,0.22);
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--wk-orange) 0%, var(--wk-green) 100%);
  transform: scaleX(0.92);
  transform-origin: left;
}

.footer-shell {
  max-width: var(--wk-content-w);
  margin-inline: auto;
  padding: 56px 24px 32px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--wk-border);
  margin-bottom: 32px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.footer-tagline {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.15em;
  color: var(--wk-orange);
}

.footer-mid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--wk-border);
}

.footer-title {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.45);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.footer-title::after {
  content: '';
  display: block;
  width: 28px;
  height: 3px;
  background: var(--wk-orange);
  margin-top: 8px;
  transform: skewX(-30deg);
}

.footer-link {
  display: block;
  padding: 6px 0;
  color: rgba(255,255,255,0.65);
  text-decoration: none;
  font-size: 14px;
  border-bottom: 1px solid transparent;
  transition: color 0.3s, border-color 0.3s, padding-left 0.3s;
}

.footer-link:hover {
  color: var(--wk-orange);
  border-bottom-color: rgba(255,61,0,0.4);
  padding-left: 6px;
}

.footer-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 0;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255,255,255,0.72);
}

.footer-meta::before {
  content: '';
  width: 6px;
  height: 6px;
  display: inline-block;
  background: var(--wk-green);
  transform: skewX(-30deg);
  flex-shrink: 0;
}

.footer-bottom {
  padding-top: 24px;
}

.footer-trust {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(169,169,169,0.72);
  max-width: 920px;
  margin-bottom: 20px;
  padding: 16px 20px;
  background: rgba(255,255,255,0.03);
  border-left: 3px solid var(--wk-green);
}

.footer-legal-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 20px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.07);
}

.footer-copy,
.footer-icp {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(169,169,169,0.55);
}

/* ---------- 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  padding: 0;
  background: var(--wk-orange);
  border: none;
  color: var(--wk-white);
  font-size: 20px;
  line-height: 1;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  opacity: 0;
  transform: translateY(16px) scale(0.9);
  pointer-events: none;
  transition: opacity 0.3s, transform 0.3s, background 0.3s, filter 0.3s;
}

.back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--wk-orange-soft);
  filter: drop-shadow(0 4px 14px rgba(255,61,0,0.5));
}

/* ---------- 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--wk-content-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.container-narrow {
  max-width: 860px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 24px;
}

/* ---------- 章节 ---------- */
.section {
  padding-block: clamp(60px, 8vw, 96px);
}

.section--black { background: var(--wk-black); }
.section--dark { background: var(--wk-ink); }
.section--teal { background: var(--wk-teal); }
.section--wine { background: var(--wk-wine); }
.section--indigo { background: var(--wk-indigo); }
.section--orange { background: var(--wk-orange); }

.section-title {
  font-family: var(--font-head);
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 900;
  line-height: 1.12;
  color: var(--wk-white);
  margin-bottom: 12px;
}

.section-title::after {
  content: '';
  display: block;
  width: 64px;
  height: 6px;
  background: linear-gradient(90deg, var(--wk-orange), var(--wk-green));
  transform: skewX(-30deg);
  margin-top: 12px;
}

.lead {
  font-size: 1.125rem;
  line-height: 1.75;
  color: rgba(255,255,255,0.68);
}

.label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--wk-orange);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--wk-green);
  background: rgba(57,255,20,0.08);
  border: 1px solid rgba(57,255,20,0.3);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 24px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-decoration: none;
  color: var(--wk-white);
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 100%, 10px 100%);
  transition: background 0.3s, color 0.3s, border-color 0.3s, transform 0.3s, filter 0.3s;
}

.btn:hover {
  transform: translateY(-2px);
}

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

.btn-primary:hover {
  background: var(--wk-orange-soft);
  filter: drop-shadow(0 4px 16px rgba(255,61,0,0.4));
}

.btn-outline {
  background: transparent;
  border-color: rgba(169,169,169,0.5);
  color: var(--wk-white);
}

.btn-outline:hover {
  border-color: var(--wk-orange);
  color: var(--wk-orange);
  filter: drop-shadow(0 0 12px rgba(255,61,0,0.2));
}

.btn-green {
  background: var(--wk-green);
  border-color: transparent;
  color: #052e00;
  font-weight: 800;
}

.btn-green:hover {
  background: #9dff8a;
  filter: drop-shadow(0 4px 16px rgba(57,255,20,0.35));
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  background: #111111;
  border: 1px solid var(--wk-border);
  padding: 28px;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 56px;
  height: 4px;
  background: var(--wk-orange);
  transform: skewX(-30deg);
  transition: width 0.3s;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(255,61,0,0.5);
  box-shadow: 0 12px 32px rgba(0,0,0,0.3);
}

.card:hover::before {
  width: 100px;
}

.card--teal { background: var(--wk-teal); }
.card--wine { background: var(--wk-wine); }
.card--indigo { background: var(--wk-indigo); }
.card--dark { background: var(--wk-ink); }

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  font-size: 13px;
  color: var(--wk-muted);
}

.breadcrumbs .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  padding-top: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--wk-border);
}

.breadcrumbs a {
  color: var(--wk-orange);
  text-decoration: none;
}

.breadcrumbs a:hover {
  text-decoration: underline;
}

.breadcrumbs .sep {
  margin-inline: 8px;
  color: var(--wk-muted);
}

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

/* ---------- 媒体帧 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--wk-border);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  background:
    linear-gradient(135deg, rgba(255,61,0,0.06) 0%, transparent 50%),
    linear-gradient(180deg, #1a1a1a 0%, #0d0d0d 100%);
}

.media-frame::before {
  content: '';
  display: block;
  padding-top: 56.25%;
}

.media-frame--vertical::before {
  padding-top: 75%;
}

.media-frame--portrait::before {
  padding-top: 125%;
}

.media-frame > img,
.media-frame > svg,
.media-frame > video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 专题研究板 ---------- */
.study-board {
  background: var(--wk-ink);
  border: 1px solid var(--wk-border);
  border-top: 4px solid var(--wk-orange);
  padding: 28px;
}

.study-board h3 {
  margin-bottom: 8px;
}

.study-board .term {
  color: var(--wk-green);
  font-family: var(--font-mono);
}

.study-board .source {
  border-top: 1px solid var(--wk-border);
  margin-top: 16px;
  padding-top: 12px;
  font-size: 13px;
  color: var(--wk-muted);
}

/* ---------- 列表 ---------- */
.list-box {
  list-style: none;
  border-left: 3px solid var(--wk-orange);
}

.list-box li {
  padding: 8px 0 8px 16px;
  border-bottom: 1px solid var(--wk-border);
}

.mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .header-cta {
    display: none;
  }
}

@media (max-width: 880px) {
  :root {
    --wk-header-h: 60px;
  }

  body {
    padding-top: var(--wk-header-h);
  }

  .nav-toggle {
    display: flex;
  }

  .header-shell {
    gap: 12px;
    padding-inline: 16px;
  }

  .header-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    height: 100vh;
    height: 100dvh;
    flex-direction: column;
    justify-content: center;
    align-items: stretch;
    gap: 0;
    padding: 80px 24px 48px;
    background: #050505;
    overflow-y: auto;
    z-index: 20;
    opacity: 0;
    visibility: hidden;
    transform: translateX(100%);
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.5s, visibility 0s 0.5s;
  }

  .header-nav::before {
    content: '';
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(-45deg, transparent 0 8px, rgba(255,61,0,0.02) 8px 9px);
    pointer-events: none;
  }

  .header-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.5s, visibility 0s;
  }

  .header-nav .header-nav-link {
    display: block;
    text-align: center;
    font-family: var(--font-head);
    font-size: 30px;
    font-weight: 900;
    line-height: 1.3;
    color: rgba(255,255,255,0.85);
    padding: 15px 20px;
  }

  .header-nav .header-nav-link:hover,
  .header-nav .header-nav-link[aria-current="page"] {
    color: var(--wk-orange);
    background: rgba(255,61,0,0.06);
  }

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

  .footer-mid {
    grid-template-columns: 1fr 1fr;
    gap: 32px 20px;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

@media (max-width: 640px) {
  .container {
    padding-inline: 16px;
  }

  .footer-shell {
    padding: 40px 16px 24px;
  }

  .footer-top {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-mid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-legal-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .back-to-top {
    right: 16px;
    bottom: 16px;
  }
}