/* ==========================================================
   JBO 竞博官网 · Site Kit 共享样式
   设计变量 / Reset / 正文容器 / 栅格 / 卡片 / 头部 / 页脚
   ========================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  --c-bg: #0A192F;
  --c-bg-2: #112240;
  --c-bg-3: #1A2C4A;
  --c-accent: #7F00FF;
  --c-accent-rgb: 127, 0, 255;
  --c-neon: #39FF14;
  --c-neon-rgb: 57, 255, 20;
  --c-text: #FFFFFF;
  --c-text-2: #A8B2D1;
  --c-border: #233554;
  --c-hover: #3E5C76;
  --c-overlay: rgba(10, 25, 47, 0.8);
  --gradient-cta: linear-gradient(135deg, #7F00FF 0%, #0A192F 100%);
  --font-headline: 'Archivo Black', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --container: 1240px;
  --header-h: 72px;
  --radius: 8px;
  --transition: 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --space-7: 96px;
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--c-text);
  background-color: var(--c-bg);
  background-image:
    linear-gradient(to right, rgba(35, 53, 84, 0.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(35, 53, 84, 0.16) 1px, transparent 1px);
  background-size: 44px 44px;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

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

ul, ol, menu {
  list-style: none;
}

a {
  color: var(--c-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 3px;
  border-radius: 3px;
}

::selection {
  background: var(--c-accent);
  color: var(--c-text);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headline);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

/* ---------- 3. 正文容器与基础分区 ---------- */
.main-content, [id="main-content"] {
  scroll-margin-top: calc(var(--header-h) + 8px);
}

.main-content {
  display: block;
  padding: var(--space-5) 0 var(--space-6);
  min-height: 60vh;
}

.page-container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.section {
  padding-block: var(--space-5);
}

/* ---------- 4. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  padding: var(--space-2) 0 var(--space-4);
  font-size: 13px;
  color: var(--c-text-2);
}

.breadcrumbs li {
  display: inline-flex;
  align-items: center;
}

.breadcrumbs li + li::before {
  content: "/";
  margin-inline: var(--space-2);
  color: var(--c-accent);
}

.breadcrumbs a {
  color: var(--c-text-2);
}

.breadcrumbs a:hover {
  color: var(--c-neon);
}

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

/* ---------- 5. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.06em;
  line-height: 1;
  border-radius: var(--radius);
  cursor: pointer;
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    background-color var(--transition),
    border-color var(--transition),
    color 0.2s ease;
}

.btn-primary {
  background: var(--gradient-cta);
  color: var(--c-text);
  border: 1px solid rgba(var(--c-accent-rgb), 0.7);
  box-shadow: 0 4px 20px rgba(var(--c-accent-rgb), 0.28);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 34px rgba(var(--c-accent-rgb), 0.45);
  color: var(--c-text);
}

.btn-ghost {
  background: transparent;
  color: var(--c-text);
  border: 1px solid var(--c-border);
}

.btn-ghost:hover {
  border-color: var(--c-neon);
  color: var(--c-neon);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(var(--c-neon-rgb), 0.16);
}

/* ---------- 6. 栅格 / 卡片 / 图片容器 ---------- */
.grid {
  display: grid;
  gap: var(--space-3);
}

.grid-cols-2 {
  grid-template-columns: 1fr 1fr;
}

.grid-cols-3 {
  grid-template-columns: 1fr;
}

.grid-cols-4 {
  grid-template-columns: 1fr;
}

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

  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1100px) {
  .grid-cols-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.card {
  position: relative;
  overflow: hidden;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: var(--space-4);
  transition:
    transform var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-accent), transparent 70%);
  opacity: 0.5;
  transition: opacity var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--c-hover);
  box-shadow: 0 14px 44px rgba(0, 0, 0, 0.35);
}

.card:hover::after {
  opacity: 1;
}

.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--c-bg-2);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.media-frame:hover img {
  transform: scale(1.04);
}

.aspect-16\/9 {
  aspect-ratio: 16 / 9;
}

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

.aspect-1\/1 {
  aspect-ratio: 1 / 1;
}

/* ---------- 7. 辅助类 ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: var(--space-3);
  z-index: 2000;
  padding: 12px 22px;
  background: var(--c-neon);
  color: var(--c-bg);
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.06em;
  border-radius: 0 0 var(--radius) var(--radius);
  transition: top 0.25s ease;
}

.skip-link:focus {
  top: 0;
  outline: none;
}

/* ---------- 8. 顶部滚动进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-neon));
  box-shadow: 0 0 12px rgba(var(--c-neon-rgb), 0.55);
  z-index: 1200;
  pointer-events: none;
}

/* ---------- 9. 头部命令栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background: rgba(10, 25, 47, 0.9);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--c-border);
}

.site-header::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-accent) 0%, var(--c-neon) 45%, transparent 90%);
  opacity: 0.9;
  pointer-events: none;
}

.header-shell {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
  position: relative;
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: var(--space-3);
}

.brand-lockup {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  color: var(--c-text);
}

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

.brand-mark {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 26px;
  color: var(--c-neon);
  text-shadow: 0 0 14px rgba(var(--c-neon-rgb), 0.75);
  transform: translateY(1px);
}

.brand-word {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: 0.04em;
}

.brand-dot {
  color: var(--c-neon);
}

.brand-tagline {
  font-size: 12px;
  color: var(--c-text-2);
  letter-spacing: 0.1em;
  border-left: 1px solid var(--c-border);
  padding-left: 10px;
  white-space: nowrap;
}

.header-bar .brand-tagline {
  display: none;
}

/* ---------- 10. 移动端导航按钮 ---------- */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.nav-toggle:hover {
  border-color: var(--c-accent);
  box-shadow: 0 0 16px rgba(var(--c-accent-rgb), 0.25);
}

.toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.2s ease;
}

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

.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0.4);
}

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

/* ---------- 11. 导航面板（移动端基础态） ---------- */
.site-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 910;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-3) var(--space-4);
  background: var(--c-overlay);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border-top: 1px solid rgba(var(--c-accent-rgb), 0.45);
  border-bottom: 1px solid var(--c-border);
  border-radius: 0 0 var(--radius) var(--radius);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  pointer-events: none;
  transition:
    opacity var(--transition),
    visibility var(--transition),
    transform var(--transition);
}

.site-nav[data-open="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.nav-list {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 4px;
}

.nav-item {
  display: flex;
  width: 100%;
}

.nav-link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 7px;
  width: 100%;
  padding: 14px 16px;
  font-size: 16px;
  color: var(--c-text-2);
  border: 1px solid transparent;
  border-radius: var(--radius);
  position: relative;
  transition:
    color 0.2s ease,
    background-color 0.2s ease,
    border-color 0.2s ease,
    transform var(--transition);
}

.nav-label {
  line-height: 1;
}

.nav-index {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--c-accent);
}

.nav-link:hover {
  color: var(--c-text);
  background: var(--c-bg-2);
  border-color: var(--c-border);
  transform: translateY(-2px);
}

.nav-link:hover .nav-index {
  color: var(--c-neon);
}

.nav-link[aria-current="page"] {
  color: var(--c-neon);
  background: rgba(var(--c-neon-rgb), 0.07);
  border-color: rgba(var(--c-neon-rgb), 0.35);
}

.nav-link[aria-current="page"] .nav-index {
  color: var(--c-neon);
}

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 4px;
  height: 2px;
  background: var(--c-neon);
  box-shadow: 0 0 8px rgba(var(--c-neon-rgb), 0.7);
}

.nav-actions {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.status-chip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-text-2);
  border: 1px solid var(--c-border);
  border-radius: 999px;
  white-space: nowrap;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-neon);
  box-shadow: 0 0 10px rgba(var(--c-neon-rgb), 0.8);
  animation: jbo-pulse 2.2s ease-in-out infinite;
}

@keyframes jbo-pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.45;
    transform: scale(0.72);
  }
}

.header-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 14px 20px;
  background: var(--gradient-cta);
  border: 1px solid rgba(var(--c-accent-rgb), 0.75);
  border-radius: var(--radius);
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-text);
  box-shadow: 0 4px 18px rgba(var(--c-accent-rgb), 0.3);
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    border-color 0.2s ease;
}

.header-cta:hover {
  color: var(--c-text);
  border-color: var(--c-neon);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(var(--c-accent-rgb), 0.5);
}

.cta-arrow {
  display: inline-block;
  transition: transform 0.25s ease;
}

.header-cta:hover .cta-arrow {
  transform: translateX(4px);
}

/* ---------- 12. 桌面端头部 ---------- */
@media (min-width: 768px) {
  .header-bar .brand-tagline {
    display: inline;
  }

  .footer-bottom {
    font-size: 13px;
  }
}

@media (min-width: 992px) {
  .header-shell {
    display: flex;
    align-items: center;
    gap: var(--space-4);
  }

  .header-bar {
    flex: 0 0 auto;
    width: auto;
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    flex: 1;
    flex-direction: row;
    justify-content: flex-end;
    align-items: center;
    gap: var(--space-3);
    margin-left: auto;
    padding: 0;
    background: transparent;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: row;
    align-items: center;
    gap: 2px;
  }

  .nav-item {
    width: auto;
  }

  .nav-link {
    justify-content: flex-start;
    width: auto;
    padding: 9px 10px;
    font-size: 14px;
  }

  .nav-link[aria-current="page"]::after {
    bottom: 2px;
  }

  .nav-actions {
    flex-direction: row;
    align-items: center;
    gap: var(--space-3);
    margin-top: 0;
  }

  .status-chip {
    padding: 6px 12px;
  }

  .header-cta {
    width: auto;
    padding: 12px 20px;
    transform: skewX(-5deg);
  }

  .header-cta:hover {
    transform: skewX(-5deg) translateY(-2px);
  }
}

/* ---------- 13. 页脚叠层面板 ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  overflow: hidden;
  background: linear-gradient(180deg, var(--c-bg-2) 0%, #060D1B 100%);
  border-top: 1px solid var(--c-border);
}

.site-footer::before {
  content: "JBO";
  position: absolute;
  right: -30px;
  bottom: -80px;
  z-index: 0;
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: clamp(160px, 24vw, 300px);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(var(--c-neon-rgb), 0.07);
  pointer-events: none;
  user-select: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 10%, var(--c-accent) 40%, var(--c-neon) 75%, transparent 100%);
  z-index: 1;
}

.footer-inner {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-6) var(--space-3) var(--space-3);
}

.footer-top {
  display: grid;
  gap: var(--space-5) var(--space-4);
}

@media (min-width: 768px) {
  .footer-top {
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: var(--space-5);
  }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-3);
}

.brand-lockup--footer .brand-mark {
  font-size: 30px;
}

.brand-lockup--footer .brand-word {
  font-size: 26px;
}

.footer-trust {
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-text-2);
  max-width: 42em;
  border-left: 3px solid var(--c-accent);
  padding-left: var(--space-3);
  margin-top: var(--space-2);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: var(--c-text-2);
}

.footer-heading {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-text);
  margin-bottom: var(--space-3);
  padding-bottom: 10px;
  position: relative;
}

.footer-heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 30px;
  height: 2px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-neon));
}

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

.footer-links a {
  display: inline-block;
  font-size: 14px;
  color: var(--c-text-2);
  padding: 2px 0;
  position: relative;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-links a:hover {
  color: var(--c-neon);
  padding-left: 8px;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  margin-top: var(--space-5);
  padding-top: var(--space-3);
  border-top: 1px solid var(--c-border);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-text-2);
}

.copyright {
  color: var(--c-text);
}

.footer-icp a {
  color: var(--c-text-2);
}

.footer-icp a:hover {
  color: var(--c-neon);
}

.footer-address {
  margin-left: auto;
}

@media (max-width: 767.98px) {
  .footer-address {
    margin-left: 0;
    width: 100%;
  }
}

/* ---------- 14. 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 950;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  background: var(--c-accent);
  border: 1px solid rgba(var(--c-accent-rgb), 0.6);
  border-radius: 50%;
  color: var(--c-text);
  font-size: 18px;
  box-shadow: 0 6px 22px rgba(var(--c-accent-rgb), 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition:
    opacity var(--transition),
    visibility var(--transition),
    transform var(--transition),
    box-shadow 0.2s ease,
    color 0.2s ease,
    border-color 0.2s ease;
}

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

.back-to-top:hover {
  border-color: var(--c-neon);
  color: var(--c-neon);
  box-shadow: 0 0 26px rgba(var(--c-neon-rgb), 0.45);
}

/* ---------- 15. 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;
  }

  .scroll-progress {
    display: none;
  }
}