/* ============================================================
   /assets/site.css
   雅博速递 · 最新雅博体育APP中国站 — 全站共享样式
   设计基因：深空蓝 × 荧光绿 × 亮橙 / 斜切 / 速度线 / 数据流
   ============================================================ */

/* ---------- 1. 设计变量与重置 ---------- */

:root {
  --yb-bg: #0B1020;
  --yb-bg-2: #121A2E;
  --yb-bg-glass: rgba(10, 14, 26, 0.72);
  --yb-green: #39FF88;
  --yb-orange: #FF6B35;
  --yb-text: #F2F5F7;
  --yb-muted: #8A94A6;
  --yb-teal: #4DE3C0;
  --yb-border: rgba(57, 255, 136, 0.2);

  --yb-font-display: "Archivo Black", "DIN Condensed", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --yb-font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --yb-font-mono: "DIN Alternate", "Bahnschrift", "Roboto Mono", "Consolas", monospace;

  --yb-header-h: 72px;
  --yb-container: 1240px;
  --yb-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
  --yb-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --yb-speed: 0.25s;
  --yb-space-1: 8px;
  --yb-space-2: 16px;
  --yb-space-3: 24px;
  --yb-space-4: 48px;
  --yb-space-5: 88px;
  --yb-space-6: 128px;
}

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

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

body {
  font-family: var(--yb-font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--yb-text);
  background-color: var(--yb-bg);
  background-image:
    linear-gradient(rgba(57, 255, 136, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 136, 0.02) 1px, transparent 1px),
    repeating-linear-gradient(-45deg, rgba(255, 107, 53, 0.014) 0 2px, transparent 2px 18px);
  background-size: 56px 56px, 56px 56px, 56px 56px;
  min-height: 100vh;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}

body.nav-open {
  overflow: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--yb-font-display);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: 0.02em;
  color: var(--yb-text);
}

h1 {
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
}

h2 {
  font-size: clamp(1.7rem, 3vw, 2.6rem);
  margin-bottom: var(--yb-space-3);
}

h3 {
  font-size: clamp(1.15rem, 1.6vw, 1.4rem);
  margin-bottom: var(--yb-space-2);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--yb-speed) ease;
}

a:hover {
  color: var(--yb-green);
}

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

ul, ol {
  padding-left: 1.25em;
}

ul[class], ol[class] {
  list-style: none;
  padding-left: 0;
}

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

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

::selection {
  background: var(--yb-green);
  color: var(--yb-bg);
}

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

/* ---------- 2. 布局基类 ---------- */

.container {
  width: min(100% - 48px, var(--yb-container));
  margin-inline: auto;
}

.main-content {
  min-height: 60vh;
  padding-top: var(--yb-header-h);
}

.page-top {
  padding-top: var(--yb-space-4);
  padding-bottom: var(--yb-space-2);
}

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

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--yb-space-4);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--yb-space-4);
}

/* ---------- 3. 无障碍 ---------- */

.skip-link {
  position: fixed;
  top: 0;
  left: 16px;
  z-index: 400;
  transform: translateY(-120%);
  background: var(--yb-green);
  color: var(--yb-bg);
  font-weight: 800;
  font-size: 14px;
  padding: 10px 24px;
  border-radius: 0 0 10px 10px;
  transition: transform 0.25s var(--yb-ease);
}

.skip-link:hover {
  color: var(--yb-bg);
}

.skip-link:focus {
  transform: translateY(0);
  color: var(--yb-bg);
}

/* ---------- 4. 顶部读取进度线 ---------- */

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 500;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--yb-green), var(--yb-teal) 55%, var(--yb-orange));
  box-shadow: 0 0 12px rgba(57, 255, 136, 0.5);
  pointer-events: none;
}

/* ---------- 5. 头部 ---------- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 300;
  height: var(--yb-header-h);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition:
    background-color 0.4s ease,
    border-color 0.4s ease,
    box-shadow 0.4s ease;
}

.site-header[data-scrolled="true"] {
  background: var(--yb-bg-glass);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom-color: var(--yb-border);
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.35);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--yb-space-3);
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding-top: 2px;
  background: linear-gradient(135deg, var(--yb-green), var(--yb-teal));
  color: var(--yb-bg);
  font-family: var(--yb-font-display);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: 0.06em;
  line-height: 1;
  clip-path: polygon(20% 0, 100% 0, 100% 80%, 80% 100%, 0 100%, 0 20%);
  filter: drop-shadow(0 0 8px rgba(57, 255, 136, 0.4));
  transition: filter 0.3s ease;
}

.brand:hover .brand-mark {
  filter: drop-shadow(0 0 14px rgba(57, 255, 136, 0.75));
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-text strong {
  font-family: var(--yb-font-display);
  font-size: 18px;
  font-weight: 900;
  letter-spacing: 0.06em;
  color: var(--yb-text);
  transition: color 0.25s ease;
}

.brand-text small {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--yb-green);
}

.brand:hover .brand-text strong {
  color: var(--yb-green);
}

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

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

.nav-list a {
  position: relative;
  display: inline-block;
  padding: 10px 15px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  color: rgba(242, 245, 247, 0.82);
  white-space: nowrap;
  transition: color 0.25s ease;
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 15px;
  right: 15px;
  bottom: 5px;
  height: 2px;
  background: var(--yb-green);
  transform: scaleX(0) skewX(-30deg);
  transform-origin: left center;
  transition: transform 0.35s var(--yb-ease);
}

.nav-list a:hover,
.nav-list a[aria-current="page"] {
  color: var(--yb-green);
}

.nav-list a:hover::after,
.nav-list a[aria-current="page"]::after {
  transform: scaleX(1) skewX(-30deg);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 20px;
  background: var(--yb-orange);
  color: var(--yb-bg);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.06em;
  white-space: nowrap;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: filter 0.25s ease, transform 0.25s var(--yb-ease), box-shadow 0.3s ease;
  flex-shrink: 0;
}

.nav-cta:hover {
  color: var(--yb-bg);
  filter: brightness(1.12);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.35);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  background: rgba(57, 255, 136, 0.08);
  border: 1px solid var(--yb-border);
  border-radius: 10px;
  padding: 10px;
  flex-shrink: 0;
  transition: background-color 0.25s ease, border-color 0.25s ease;
}

.nav-toggle:hover {
  background: rgba(57, 255, 136, 0.16);
  border-color: rgba(57, 255, 136, 0.45);
}

.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--yb-text);
  border-radius: 2px;
  transition: transform 0.3s var(--yb-ease), opacity 0.25s ease;
}

.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;
  transform: scaleX(0.4);
}

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

/* ---------- 6. 通用按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  font-family: var(--yb-font-body);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.04em;
  border: none;
  border-radius: 0;
  color: var(--yb-text);
  background: transparent;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: transform 0.25s var(--yb-ease), box-shadow 0.3s ease, filter 0.25s ease, border-color 0.25s ease, color 0.25s ease, background-color 0.25s ease;
}

.btn-primary {
  background: var(--yb-green);
  color: var(--yb-bg);
}

.btn-primary:hover {
  color: var(--yb-bg);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(57, 255, 136, 0.35);
  filter: brightness(1.06);
}

.btn-accent {
  background: var(--yb-orange);
  color: var(--yb-bg);
}

.btn-accent:hover {
  color: var(--yb-bg);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(255, 107, 53, 0.35);
  filter: brightness(1.06);
}

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

.btn-ghost:hover {
  color: var(--yb-green);
  border-color: rgba(57, 255, 136, 0.55);
  transform: translateY(-2px);
}

/* ---------- 7. 卡片与章节标记 ---------- */

.chamfer-card {
  position: relative;
  background: var(--yb-bg-2);
  border: 1px solid var(--yb-border);
  padding: var(--yb-space-4);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: transform 0.35s var(--yb-ease), border-color 0.3s ease, box-shadow 0.35s ease;
}

.chamfer-card:hover {
  transform: translateY(-5px);
  border-color: rgba(57, 255, 136, 0.55);
  box-shadow: var(--yb-shadow);
}

.chamfer-card--orange {
  border-color: rgba(255, 107, 53, 0.35);
}

.chamfer-card--orange:hover {
  border-color: rgba(255, 107, 53, 0.7);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--yb-font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--yb-green);
}

.section-label::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--yb-orange);
  transform: skewX(-32deg);
  flex-shrink: 0;
}

.section-label--alt {
  color: var(--yb-orange);
}

.section-label--alt::before {
  background: var(--yb-green);
}

/* ---------- 8. 面包屑 ---------- */

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: var(--yb-space-3);
  font-size: 13px;
  color: var(--yb-muted);
}

.breadcrumbs a {
  color: var(--yb-muted);
  transition: color 0.25s ease;
}

.breadcrumbs a:hover {
  color: var(--yb-green);
}

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

.breadcrumbs .breadcrumb-sep {
  opacity: 0.5;
}

/* ---------- 9. 页脚 ---------- */

.site-footer {
  position: relative;
  margin-top: var(--yb-space-6);
  background: var(--yb-bg-2);
  border-top: 1px solid var(--yb-border);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--yb-green) 0%, transparent 28%, var(--yb-teal) 50%, transparent 72%, var(--yb-orange) 100%);
  opacity: 0.75;
}

.site-footer::after {
  content: "YABO EXPRESS";
  position: absolute;
  top: 24px;
  right: 20px;
  font-family: var(--yb-font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.32em;
  color: rgba(242, 245, 247, 0.06);
  pointer-events: none;
  writing-mode: vertical-rl;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2.2fr 1fr 1fr 1.8fr;
  gap: var(--yb-space-4);
  padding-block: var(--yb-space-5) var(--yb-space-4);
}

.footer-brand .brand-mark {
  width: 46px;
  height: 46px;
}

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

.footer-brand .brand-text small {
  font-size: 12px;
}

.footer-trust {
  margin-top: var(--yb-space-3);
  font-size: 14px;
  line-height: 1.9;
  color: var(--yb-muted);
  max-width: 34em;
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: var(--yb-space-2);
  padding-bottom: var(--yb-space-1);
  font-family: var(--yb-font-display);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--yb-green);
  border-bottom: 1px solid var(--yb-border);
}

.footer-heading::before {
  content: "";
  width: 16px;
  height: 2px;
  background: var(--yb-orange);
  transform: skewX(-32deg);
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: var(--yb-space-2);
}

.footer-links a {
  display: inline-block;
  color: var(--yb-muted);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.25s ease, transform 0.25s var(--yb-ease);
}

.footer-links a:hover {
  color: var(--yb-green);
  transform: translateX(6px);
}

.footer-contact {
  margin-top: var(--yb-space-2);
}

.footer-contact p {
  color: var(--yb-muted);
  font-size: 14px;
  line-height: 2.2;
}

.footer-contact strong {
  color: var(--yb-text);
  font-weight: 600;
}

.footer-bottom {
  border-top: 1px solid rgba(138, 148, 166, 0.16);
  background:
    repeating-linear-gradient(-45deg, rgba(57, 255, 136, 0.028) 0 1px, transparent 1px 9px),
    rgba(0, 0, 0, 0.28);
  padding-block: var(--yb-space-3);
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--yb-space-2);
  font-size: 13px;
  color: var(--yb-muted);
}

.footer-bottom-inner a {
  color: var(--yb-muted);
  transition: color 0.25s ease;
}

.footer-bottom-inner a:hover {
  color: var(--yb-green);
}

.footer-bottom-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--yb-space-1);
}

/* ---------- 10. 返回顶部 ---------- */

.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 200;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  background: var(--yb-bg-2);
  border: 1px solid var(--yb-border);
  border-radius: 10px;
  color: var(--yb-green);
  font-size: 20px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity 0.3s ease, transform 0.35s var(--yb-ease), visibility 0.3s ease, border-color 0.25s ease, color 0.25s ease, box-shadow 0.3s ease;
}

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

.back-top:hover {
  color: var(--yb-orange);
  border-color: rgba(255, 107, 53, 0.6);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

/* ---------- 11. 滚动显现 ---------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.75s var(--yb-ease);
  will-change: opacity, transform;
}

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

/* ---------- 12. 响应式 ---------- */

@media (max-width: 1024px) {
  .nav-toggle {
    display: flex;
  }

  .nav-cta {
    display: none;
  }

  .site-nav {
    position: fixed;
    top: var(--yb-header-h);
    left: 12px;
    right: 12px;
    z-index: 299;
    max-height: calc(100vh - var(--yb-header-h) - 24px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    background: var(--yb-bg-glass);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid var(--yb-border);
    border-radius: 0 0 18px 18px;
    padding: 10px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.4s var(--yb-ease), visibility 0.3s ease;
  }

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

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

  .nav-list a {
    display: block;
    padding: 13px 16px;
    font-size: 16px;
    color: var(--yb-text);
    border-radius: 8px;
    border-left: 3px solid transparent;
  }

  .nav-list a::after {
    display: none;
  }

  .nav-list a:hover,
  .nav-list a[aria-current="page"] {
    background: rgba(57, 255, 136, 0.1);
    border-left-color: var(--yb-green);
    color: var(--yb-green);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--yb-space-4);
  }
}

@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 32px, var(--yb-container));
  }

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

  .back-top {
    right: 16px;
    bottom: 16px;
    width: 42px;
    height: 42px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    padding-top: var(--yb-space-4);
  }

  .footer-bottom-inner {
    flex-direction: column;
    text-align: center;
  }
}

/* ---------- 13. 兼容与降级 ---------- */

@supports not ((backdrop-filter: blur(8px)) or (-webkit-backdrop-filter: blur(8px))) {
  .site-header[data-scrolled="true"],
  .site-nav {
    background: var(--yb-bg);
  }
}

/* ---------- 14. 减少动态偏好 ---------- */

@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;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    will-change: auto;
  }

  .scroll-progress {
    display: none;
  }
}