/* =============================================
   site.css — 亚美娱乐共享样式
   仅供 /assets/site.css 加载使用
   ============================================= */

/* ---------- 1. 变量 ---------- */
:root {
  /* 色彩体系 */
  --color-base: #0A0E24;
  --color-base-2: #1A1438;
  --color-base-3: #2A1B4A;
  --color-gold: #D4AF37;
  --color-magenta: #FF2E88;
  --color-bronze: #2D8F82;
  --color-chu-red: #B22222;
  --color-text: #F4F4F8;
  --color-text-2: #A0A5B8;
  --color-line: #3A4066;

  /* 字体 */
  --font-title: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', serif;

  /* 布局 */
  --rail-width: 280px;
  --topbar-h: 64px;
  --container-w: 1200px;
  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 20px;

  /* 动效 */
  --speed: 0.3s;
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background: linear-gradient(135deg, #0A0E24 0%, #1A1438 50%, #2A1B4A 100%);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-title);
  font-weight: 300;
  letter-spacing: 0.1em;
  line-height: 1.4;
  color: var(--color-text);
}

h1 {
  font-size: 44px;
  font-style: italic;
}

h2 {
  font-size: 32px;
}

h3 {
  font-size: 24px;
}

p {
  color: var(--color-text);
}

a {
  color: var(--color-gold);
  text-decoration: none;
  transition: color 0.25s ease;
}

a:hover {
  color: var(--color-magenta);
}

hr {
  border: none;
  border-top: 1px solid var(--color-line);
  margin: 32px 0;
}

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

ul, ol {
  padding-left: 1.4em;
}

/* 焦点可见 */
:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---------- 3. 桌面端主体偏移 ---------- */
@media (min-width: 1024px) {
  body {
    padding-left: var(--rail-width);
  }
}

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -48px;
  left: 16px;
  z-index: 2000;
  padding: 8px 16px;
  background: var(--color-gold);
  color: var(--color-base);
  font-family: var(--font-title);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  border-radius: 0 0 6px 6px;
  transition: top var(--speed) ease;
}

.skip-link:focus-visible {
  top: 0;
}

@media (min-width: 1024px) {
  .skip-link {
    left: calc(var(--rail-width) + 16px);
  }
}

/* ---------- 5. 通用容器与分区 ---------- */
.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 32px;
}

.section {
  padding: 96px 0;
}

.section--tight {
  padding: 48px 0;
}

.page-heading {
  padding: 64px 0 24px;
}

.page-heading__title {
  font-size: 44px;
  font-style: italic;
  font-weight: 300;
  letter-spacing: 0.1em;
  color: var(--color-text);
}

.page-heading__lead {
  margin-top: 16px;
  max-width: 640px;
  color: var(--color-text-2);
  font-size: 16px;
  line-height: 1.9;
}

/* ---------- 6. 栏目索引标签 ---------- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-title);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.24em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 1px;
  background: var(--color-gold);
}

.section-label--bronze {
  color: var(--color-bronze);
}

.section-label--bronze::before {
  background: var(--color-bronze);
}

/* ---------- 7. 头部：顶栏 ---------- */
.site-header {
  position: relative;
  z-index: 1000;
}

.site-header__topbar {
  display: none;
}

.site-header__mobile-brand {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-title);
  font-size: 18px;
  font-weight: 300;
  font-style: italic;
  letter-spacing: 0.1em;
  color: var(--color-text);
  text-decoration: none;
}

.site-header__mobile-brand::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 8px;
  background: var(--color-gold);
  border-radius: 50%;
}

.site-nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  background: none;
  border: none;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.25s ease;
}

.site-nav-toggle:hover {
  background: rgba(255, 255, 255, 0.06);
}

.site-nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-gold);
  border-radius: 1px;
  transition: background 0.25s ease, transform 0.25s ease, opacity 0.25s ease;
}

.site-nav-toggle__text {
  font-family: var(--font-title);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--color-text-2);
}

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

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

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

/* ---------- 8. 头部：侧边轨道 ---------- */
.site-header__rail {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1200;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: var(--rail-width);
  height: 100vh;
  height: 100dvh;
  padding: 48px 28px 32px;
  background: linear-gradient(180deg, #0A0E24 0%, #1A1438 100%);
  border-right: 1px solid var(--color-line);
  overflow-y: auto;
  overflow-x: hidden;
  transform: translateX(0);
  transition: transform var(--speed) var(--ease);
}

.site-header__rail::after {
  content: '';
  position: absolute;
  bottom: -60px;
  right: -60px;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

/* 品牌区 */
.site-header__brand {
  position: relative;
  padding-top: 26px;
  margin-bottom: 40px;
}

.site-header__brand::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-gold);
  transform: rotate(45deg);
  border-radius: 2px;
  opacity: 0.8;
}

.site-header__brand::after {
  content: '';
  display: block;
  width: 48px;
  height: 1px;
  margin-top: 20px;
  background: linear-gradient(90deg, var(--color-gold) 0%, transparent 100%);
}

.site-header__brand-link {
  display: inline-block;
  text-decoration: none;
}

.site-header__brand-name {
  display: block;
  font-family: var(--font-title);
  font-weight: 300;
  font-style: italic;
  font-size: 28px;
  letter-spacing: 0.12em;
  color: var(--color-text);
  transition: color 0.25s ease;
}

.site-header__brand-slogan {
  display: block;
  margin-top: 8px;
  font-family: var(--font-title);
  font-size: 12px;
  font-weight: 300;
  letter-spacing: 0.2em;
  color: var(--color-text-2);
  text-transform: uppercase;
}

.site-header__brand-link:hover .site-header__brand-name {
  color: var(--color-gold);
}

.site-header__brand-link:hover .site-header__brand-slogan {
  color: var(--color-text);
}

/* 导航 */
.site-header__nav {
  flex: 1;
}

.site-header__nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-header__nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  font-family: var(--font-title);
  font-weight: 300;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--color-text-2);
  border-left: 2px solid transparent;
  border-radius: 0 6px 6px 0;
  position: relative;
  overflow: hidden;
  transition: color 0.25s ease, border-color 0.25s ease, padding-left 0.25s ease, background 0.25s ease;
}

.site-header__nav-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: linear-gradient(90deg, rgba(212, 175, 55, 0.12) 0%, transparent 100%);
  transition: width 0.35s ease;
  z-index: 0;
}

.site-header__nav-link:hover {
  color: var(--color-text);
  border-left-color: var(--color-gold);
  padding-left: 18px;
}

.site-header__nav-link:hover::before {
  width: 100%;
}

.site-header__nav-link[aria-current="page"] {
  color: var(--color-gold);
  border-left-color: var(--color-gold);
  background: rgba(212, 175, 55, 0.08);
}

.site-header__nav-index {
  font-family: var(--font-title);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--color-gold);
  opacity: 0.55;
  min-width: 22px;
  position: relative;
  z-index: 1;
}

.site-header__nav-link[aria-current="page"] .site-header__nav-index {
  opacity: 1;
}

.site-header__nav-label {
  position: relative;
  z-index: 1;
}

/* 轨道底部 */
.site-header__rail-footer {
  position: relative;
  padding-top: 24px;
  border-top: 1px solid var(--color-line);
}

.site-header__rail-line {
  display: block;
  width: 100%;
  height: 1px;
  margin-bottom: 16px;
  background: linear-gradient(90deg, var(--color-gold) 0%, transparent 100%);
  opacity: 0.5;
}

.site-header__slogan {
  font-family: var(--font-title);
  font-size: 12px;
  font-weight: 300;
  letter-spacing: 0.16em;
  color: var(--color-text-2);
  line-height: 1.8;
}

/* 滚动进度 */
.site-header__progress {
  position: absolute;
  top: 0;
  right: -1px;
  width: 2px;
  height: 0;
  background: linear-gradient(180deg, var(--color-gold) 0%, var(--color-magenta) 100%);
  opacity: 0.7;
  pointer-events: none;
}

/* 遮罩层 */
.site-nav-overlay {
  display: none;
}

/* ---------- 9. 头部：移动端适配 ---------- */
@media (max-width: 1023px) {
  body {
    padding-top: var(--topbar-h);
  }

  body[data-nav-open] {
    overflow: hidden;
  }

  .site-header__topbar {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1100;
    align-items: center;
    justify-content: space-between;
    height: var(--topbar-h);
    padding: 0 20px;
    background: rgba(10, 14, 36, 0.85);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-line);
  }

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

  .site-header__rail {
    width: min(320px, 85vw);
    transform: translateX(-100%);
    visibility: hidden;
    box-shadow: 18px 0 48px rgba(0, 0, 0, 0.45);
    transition: transform var(--speed) var(--ease), visibility 0s linear var(--speed);
  }

  .site-header__rail[data-open] {
    transform: translateX(0);
    visibility: visible;
    transition: transform var(--speed) var(--ease), visibility 0s;
  }

  .site-header__brand {
    margin-bottom: 32px;
  }

  .site-nav-overlay {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 1050;
    background: rgba(5, 8, 20, 0.6);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--speed) ease, visibility var(--speed) ease;
  }

  .site-nav-overlay[data-open] {
    opacity: 1;
    visibility: visible;
  }

  #main-content {
    scroll-margin-top: var(--topbar-h);
  }
}

/* ---------- 10. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 80px;
  background: linear-gradient(180deg, var(--color-base) 0%, var(--color-base-2) 100%);
  border-top: 1px solid var(--color-line);
  overflow: hidden;
}

/* 有机光晕装饰 */
.site-footer::before {
  content: '';
  position: absolute;
  top: -140px;
  right: 10%;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(45, 143, 130, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.site-footer::after {
  content: '';
  position: absolute;
  bottom: -80px;
  left: 30%;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(178, 34, 34, 0.09) 0%, transparent 70%);
  pointer-events: none;
}

.site-footer__body {
  position: relative;
  z-index: 1;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 64px 32px 48px;
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 48px;
}

.site-footer__brand-name {
  font-family: var(--font-title);
  font-weight: 300;
  font-style: italic;
  font-size: 28px;
  letter-spacing: 0.14em;
  color: var(--color-text);
}

.site-footer__slogan {
  margin-top: 8px;
  font-family: var(--font-title);
  font-size: 13px;
  font-weight: 300;
  letter-spacing: 0.18em;
  color: var(--color-text-2);
}

.site-footer__trust {
  max-width: 280px;
  margin-top: 24px;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.9;
  color: var(--color-text-2);
  letter-spacing: 0.02em;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.site-footer__heading {
  font-family: var(--font-title);
  font-weight: 300;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-line);
  position: relative;
}

.site-footer__heading::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 32px;
  height: 1px;
  background: var(--color-gold);
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__link {
  display: inline-block;
  font-family: var(--font-title);
  font-size: 14px;
  font-weight: 300;
  letter-spacing: 0.05em;
  color: var(--color-text-2);
  padding: 2px 0;
  transition: color 0.25s ease, padding-left 0.25s ease;
}

.site-footer__link:hover {
  color: var(--color-gold);
  padding-left: 8px;
}

.site-footer__contact {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.site-footer__meta {
  font-family: var(--font-title);
  font-size: 13px;
  font-weight: 300;
  letter-spacing: 0.04em;
  color: var(--color-text-2);
  line-height: 1.6;
  overflow-wrap: anywhere;
}

.site-footer__bottom {
  position: relative;
  z-index: 1;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 20px 32px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid var(--color-line);
}

.site-footer__icp {
  font-family: var(--font-title);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-text-2);
}

.site-footer__copy {
  font-family: var(--font-title);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--color-chu-red);
}

/* ---------- 11. 页脚：移动端适配 ---------- */
@media (max-width: 1023px) {
  .site-footer__body {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 48px 24px 36px;
  }
}

@media (max-width: 767px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

  .site-footer__contact {
    grid-column: 1 / -1;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 24px;
  }
}

/* ---------- 12. 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 2px;
  font-family: var(--font-title);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  text-align: center;
  transition: all 0.3s ease;
}

.btn--primary {
  background: linear-gradient(135deg, #D4AF37 0%, #B89833 100%);
  color: var(--color-base);
  border-color: #D4AF37;
}

.btn--primary:hover {
  background: linear-gradient(135deg, #E8C550 0%, #D4AF37 100%);
  box-shadow: 0 4px 24px rgba(212, 175, 55, 0.3);
  transform: translateY(-2px);
  color: var(--color-base);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-line);
}

.btn--ghost:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
  background: rgba(212, 175, 55, 0.04);
}

/* ---------- 13. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 0 0 24px;
  font-family: var(--font-title);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--color-text-2);
  list-style: none;
}

.breadcrumb__link {
  color: var(--color-text-2);
  text-decoration: none;
  transition: color 0.25s ease;
}

.breadcrumb__link:hover {
  color: var(--color-gold);
}

.breadcrumb__sep {
  color: var(--color-line);
  margin: 0 4px;
}

.breadcrumb__current {
  color: var(--color-gold);
}

/* ---------- 14. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: linear-gradient(145deg, var(--color-base-2) 0%, var(--color-base) 100%);
  aspect-ratio: 16 / 9;
  border: 1px solid var(--color-line);
}

.media-frame--tall {
  aspect-ratio: 4 / 5;
}

.media-frame--wide {
  aspect-ratio: 21 / 9;
}

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media-frame__caption {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 4px 12px;
  background: rgba(10, 14, 36, 0.7);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  color: var(--color-text-2);
  font-family: var(--font-title);
  font-size: 12px;
  letter-spacing: 0.08em;
  border-radius: 2px;
}

/* ---------- 15. 间距工具 ---------- */
.u-mt-1 { margin-top: 8px; }
.u-mt-2 { margin-top: 16px; }
.u-mt-3 { margin-top: 24px; }
.u-mt-4 { margin-top: 32px; }
.u-mt-5 { margin-top: 48px; }
.u-mt-6 { margin-top: 64px; }
.u-mb-1 { margin-bottom: 8px; }
.u-mb-2 { margin-bottom: 16px; }
.u-mb-3 { margin-bottom: 24px; }
.u-mb-4 { margin-bottom: 32px; }
.u-mb-5 { margin-bottom: 48px; }
.u-mb-6 { margin-bottom: 64px; }

/* ---------- 16. 响应式通配 ---------- */
@media (max-width: 767px) {
  html {
    font-size: 15px;
  }

  .container {
    padding: 0 20px;
  }

  .section {
    padding: 56px 0;
  }

  .page-heading {
    padding: 40px 0 16px;
  }

  .page-heading__title {
    font-size: 32px;
  }
}

/* ---------- 17. 减少动态偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  html {
    scroll-behavior: auto;
  }
}