/* ==========================================================================
   易游全球站 · Site Kit
   路径 /assets/site.css
   ========================================================================== */

/* ---------- 重置与基础 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font: inherit; color: inherit; }
ul, ol { list-style: none; }
a { text-decoration: none; color: var(--color-primary); transition: color .2s ease, background .2s ease, border-color .2s ease, box-shadow .2s ease, transform .2s ease; }
a:hover { color: var(--color-primary-dark); }

#main-content {
  flex: 1;
  scroll-margin-top: 100px;
}

/* ---------- CSS 变量 ---------- */
:root {
  --color-bg: #F4F7FC;
  --color-primary: #0052D9;
  --color-primary-dark: #1A2B4A;
  --color-accent: #FF7A2F;
  --color-success: #00A870;
  --color-warning: #B54768;
  --color-violet: #6C4AB6;
  --color-text: #2B2F36;
  --color-text-secondary: #4E5969;
  --color-border: #E5E8EF;
  --font-sans: -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --font-heading: 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
  --container-w: 1200px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 12px rgba(26, 43, 74, .06);
  --shadow-md: 0 10px 36px rgba(26, 43, 74, .12);
  --transition: .25s ease;
  --gradient-brand: linear-gradient(135deg, #0052D9 0%, #6C4AB6 100%);
  --gradient-accent: linear-gradient(135deg, #FF7A2F 0%, #FFB65C 100%);
  --gradient-live: linear-gradient(90deg, #0052D9, #00A870);
}

/* ---------- 中文排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-primary-dark);
}
h1 { font-size: 34px; margin-bottom: 20px; letter-spacing: -.02em; }
h2 { font-size: 26px; margin: 40px 0 16px; letter-spacing: -.01em; }
h3 { font-size: 20px; margin: 24px 0 12px; }
h4 { font-size: 17px; margin: 20px 0 10px; }
p { margin-bottom: 16px; }
::selection { background: rgba(0, 82, 217, .14); color: var(--color-primary-dark); }

/* ---------- 容器与工具 ---------- */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.lede {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 56ch;
}

.mono {
  font-family: var(--font-mono);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -200px;
  left: 16px;
  z-index: 200;
  background: var(--color-primary);
  color: #fff;
  padding: 12px 24px;
  border-radius: 0 0 12px 12px;
  font-weight: 600;
  box-shadow: var(--shadow-md);
  transition: top .25s ease;
}
.skip-link:focus { top: 0; }
.skip-link:hover { color: #fff; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-sans);
  border: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 4px 18px rgba(0, 82, 217, .3);
  color: #fff;
}

.btn-accent {
  background: var(--color-accent);
  color: #fff;
}
.btn-accent:hover {
  background: #E5661D;
  box-shadow: 0 4px 18px rgba(255, 122, 47, .32);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-primary-dark);
}
.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(0, 82, 217, .04);
}

.btn-small {
  padding: 6px 16px;
  font-size: 13px;
  border-radius: 999px;
}

/* ---------- 章节索引 ---------- */
.section-index {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .5px;
  color: var(--color-accent);
  background: rgba(255, 122, 47, .1);
  border: 1px solid rgba(255, 122, 47, .16);
  padding: 2px 10px;
  border-radius: 999px;
}
.section-index::before {
  content: '//';
  opacity: .55;
  font-size: 11px;
}

/* ---------- 玻璃卡片 ---------- */
.glass-card {
  background: rgba(255, 255, 255, .7);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, .8);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 28px;
  transition: transform .3s ease, box-shadow .3s ease;
}
.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* ---------- 栅格 ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* ---------- 图片容器基类 ---------- */
.figure {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-border);
  aspect-ratio: 16 / 9;
}
.figure--square { aspect-ratio: 1; }
.figure--tall { aspect-ratio: 4 / 5; }
.figure--wide { aspect-ratio: 21 / 9; }
.figure--placeholder {
  background: linear-gradient(135deg, rgba(0, 82, 217, .06), rgba(108, 74, 182, .06));
  border: 1.5px dashed rgba(0, 82, 217, .25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-secondary);
}
.figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  inset: 0;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding: 16px 0;
  margin-bottom: 24px;
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 14px;
}
.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb li:not(:last-child)::after {
  content: '/';
  font-family: var(--font-mono);
  color: var(--color-border);
}
.breadcrumb a { color: var(--color-primary); }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb [aria-current="page"] {
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* ==========================================================================
   头部
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(244, 247, 252, .8);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--color-border);
}

.header-progress {
  position: absolute;
  bottom: -2px;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--gradient-live);
  z-index: 105;
  pointer-events: none;
  border-radius: 0 3px 3px 0;
}

.site-header__top {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, .78);
  border-bottom: 1px solid rgba(255, 255, 255, .06);
}
.site-header__top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 36px;
}

.site-header__status {
  display: flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__pulse {
  position: relative;
  flex-shrink: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-success);
  margin-right: 8px;
}
.site-header__pulse::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1px solid var(--color-success);
  animation: pulse-ring 2s ease-out infinite;
}
@keyframes pulse-ring {
  0% { transform: scale(.5); opacity: 1; }
  80% { transform: scale(1.6); opacity: 0; }
  100% { transform: scale(1.6); opacity: 0; }
}

.site-header__since {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, .5);
  white-space: nowrap;
}

.site-header__main {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 72px;
}

/* ---------- 品牌 ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--color-primary-dark);
}
.brand:hover { color: var(--color-primary-dark); }

.brand__mark {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--gradient-brand);
  box-shadow: 0 4px 12px rgba(0, 82, 217, .25);
}
.brand__mark::before {
  content: '';
  width: 0;
  height: 0;
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  border-left: 10px solid #fff;
  margin-left: 3px;
}

.brand__name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: .5px;
  white-space: nowrap;
}

/* ---------- 主导航 ---------- */
.site-nav { margin: 0 auto; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  position: relative;
}
.site-nav__link::after {
  content: '';
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s ease;
}
.site-nav__link:hover {
  color: var(--color-primary);
  background: rgba(0, 82, 217, .06);
}
.site-nav__link:hover::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"] {
  color: var(--color-primary);
  background: rgba(0, 82, 217, .08);
  font-weight: 700;
}
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 10px;
  opacity: .55;
  letter-spacing: .5px;
  transform: translateY(1px);
}

/* ---------- 主行操作区 ---------- */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

/* ---------- 移动导航按钮 ---------- */
.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, .7);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 3px;
  padding: 0;
  flex-shrink: 0;
}
.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-primary-dark);
  transition: transform .3s ease, opacity .3s ease;
}
.nav-toggle[data-open] .nav-toggle__bar:first-child {
  transform: translateY(5px) rotate(45deg);
}
.nav-toggle[data-open] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle[data-open] .nav-toggle__bar:last-child {
  transform: translateY(-5px) rotate(-45deg);
}

/* ---------- 头部响应式 ---------- */
@media (max-width: 1080px) {
  .site-header__main { min-height: 64px; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin: 0;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    background: rgba(255, 255, 255, .97);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transition: max-height .4s ease, opacity .3s ease, visibility 0s .4s;
  }
  .site-nav[data-open] {
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    overscroll-behavior: contain;
    opacity: 1;
    visibility: visible;
    transition: max-height .4s ease, opacity .3s ease;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 24px 20px;
  }
  .site-nav__item {
    border-bottom: 1px solid var(--color-border);
  }
  .site-nav__item:last-child { border-bottom: none; }
  .site-nav__link {
    padding: 13px 8px;
    border-radius: 0;
    font-size: 16px;
    gap: 10px;
  }
  .site-nav__link::after {
    left: 8px;
    right: auto;
    bottom: 0;
    width: 36px;
    height: 2px;
  }
  .site-nav__num {
    font-size: 12px;
    width: 20px;
  }

  .nav-toggle {
    display: inline-flex;
  }
}

@media (max-width: 640px) {
  .site-header__since { display: none; }
  .site-header__status { font-size: 11px; }
  .site-header__actions .btn-small { display: none; }
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  background-color: var(--color-primary-dark);
  background-image:
    radial-gradient(circle at 15% -30%, rgba(108, 74, 182, .35) 0%, transparent 50%),
    radial-gradient(circle at 100% 20%, rgba(0, 82, 217, .25) 0%, transparent 45%);
  color: rgba(255, 255, 255, .72);
  position: relative;
  overflow: hidden;
  margin-top: auto;
}

.site-footer__deco {
  display: block;
  height: 4px;
  background: var(--gradient-brand);
  opacity: .8;
}

.site-footer__main {
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr;
  gap: 48px;
  padding: 56px 0 40px;
}

.site-footer__brand-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.brand--footer { color: #fff; }
.brand--footer:hover { color: #fff; }
.brand--footer .brand__mark {
  background: linear-gradient(135deg, #3D84FF, #7B61FF);
  box-shadow: none;
  border: 1px solid rgba(255, 255, 255, .2);
}
.brand--footer .brand__name { color: #fff; }

.site-footer__slogan {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .5px;
  color: rgba(255, 255, 255, .45);
}

.site-footer__trust {
  margin-top: 20px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, .55);
  border-left: 3px solid var(--color-accent);
  padding-left: 16px;
  max-width: 38ch;
}

.site-footer__support {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, .4);
  font-family: var(--font-mono);
  border: 1px dashed rgba(255, 255, 255, .14);
  border-radius: 8px;
  padding: 8px 12px;
  max-width: 100%;
}

.site-footer__title {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
  font-weight: 600;
}

.site-footer__links {
  display: grid;
  gap: 2px;
}
.site-footer__links a {
  display: inline-block;
  padding: 5px 0;
  color: rgba(255, 255, 255, .7);
  font-size: 15px;
  transition: color .2s ease, padding-left .2s ease;
}
.site-footer__links a:hover {
  color: #fff;
  padding-left: 5px;
}

.site-footer__address {
  font-style: normal;
  display: grid;
  gap: 4px;
  margin-top: 14px;
  font-size: 14px;
  color: rgba(255, 255, 255, .55);
  line-height: 1.6;
}

.site-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, .08);
  padding: 18px 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(255, 255, 255, .45);
}
.site-footer__bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px 24px;
}

/* ---------- 页脚响应式 ---------- */
@media (max-width: 900px) {
  .site-footer__main {
    grid-template-columns: 1fr 1fr;
    gap: 32px 40px;
    padding: 44px 0 32px;
  }
  .site-footer__brand-col {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .site-footer__main {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-top: 36px;
  }
  .site-footer__trust {
    max-width: 100%;
  }
  .site-footer__bottom-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ---------- 滚动进入动画 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .6s ease, transform .6s ease;
  transition-delay: calc(var(--reveal-delay, 0) * 80ms);
}
[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 焦点可见 ---------- */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 6px;
}
:focus:not(:focus-visible) {
  outline: none;
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .header-progress { display: none; }
  .site-header__pulse::after { display: none; }
}

/* ---------- 栅格响应式 ---------- */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  h1 { font-size: 28px; }
  h2 { font-size: 22px; }
}