/* ==========================================================================
   博澳娱乐 · 全站基础样式
   文件：/assets/site.css
   作用：reset、CSS 变量、中文排版、头部与页脚、通用按钮、面包屑、
        正文容器、网格与基础组件。页面特色布局由页面专属 CSS 补充。
   ========================================================================== */

/* ---------- 1. Reset 与变量 ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* 珠宝色系 */
  --color-deep-blue: #0A1E3C;
  --color-blue-mid: #12294D;
  --color-gold: #D4AF37;
  --color-gold-soft: #E8C766;
  --color-gold-dim: #A88925;
  --color-teal: #123F3D;
  --color-burgundy: #5E1224;
  --color-indigo: #3B2A5E;
  --color-body-light: #E8E6E3;
  --color-body-muted: rgba(232, 230, 227, 0.68);
  --color-body-dark: #1A1A1A;
  --color-glass: rgba(255, 255, 255, 0.12);
  --color-glass-strong: rgba(255, 255, 255, 0.2);
  --color-near-white: #F4F0EB;
  --color-border-dark: rgba(212, 175, 55, 0.25);
  --gradient-accent: linear-gradient(135deg, #8A2BE2, #FF4B8C);

  /* 字体 */
  --font-heading: 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
  --font-body: 'Songti SC', 'STSong', 'SimSun', serif;
  --font-data: 'SF Mono', 'Consolas', 'Menlo', monospace;

  /* 布局与圆角 */
  --content-max: 1280px;
  --header-z: 100;
  --radius-lg: 14px;
  --radius-md: 8px;
  --radius-sm: 4px;

  /* 间距 */
  --spacing-1: 4px;
  --spacing-2: 8px;
  --spacing-3: 16px;
  --spacing-4: 24px;
  --spacing-5: 32px;
  --spacing-6: 48px;
  --spacing-7: 64px;

  /* 效果 */
  --shadow-panel: 0 8px 30px rgba(0, 0, 0, 0.35);
  --transition-base: 0.25s ease;
}

/* ---------- 2. 基础排版 ---------- */
html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-deep-blue);
  color: var(--color-body-light);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

p {
  overflow-wrap: break-word;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-base), border-color var(--transition-base);
}

ul, ol {
  list-style: none;
}

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

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

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

::selection {
  background: var(--color-gold);
  color: var(--color-deep-blue);
}

main {
  width: 100%;
  flex: 1;
}

/* ---------- 3. 布局工具 ---------- */
.container {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--spacing-5);
}

.section {
  padding-block: var(--spacing-7);
}

#main-content {
  scroll-margin-top: 120px;
  min-height: 60vh;
}

.grid {
  display: grid;
  gap: var(--spacing-5);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.hero-split {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: var(--spacing-6);
  align-items: center;
}

.divider {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, var(--color-gold), transparent);
  margin-block: var(--spacing-5);
}

/* ---------- 4. 页面标题区 ---------- */
.page-header {
  margin-bottom: var(--spacing-6);
}

.page-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--color-body-light);
}

.page-subtitle {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  color: var(--color-body-muted);
  margin-top: var(--spacing-3);
  max-width: 60ch;
}

.text-block {
  max-width: 65ch;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-body-muted);
}

.text-block > * + * {
  margin-top: var(--spacing-3);
}

/* ---------- 5. 滚动进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--gradient-accent);
  z-index: calc(var(--header-z) + 200);
  pointer-events: none;
}

/* ---------- 6. 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: -60px;
  left: var(--spacing-4);
  z-index: calc(var(--header-z) + 300);
  background: var(--color-gold);
  color: var(--color-deep-blue);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.875rem;
  padding: 12px 24px;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  transition: top var(--transition-base);
}

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

/* ---------- 7. 公告条 ---------- */
.announce-bar {
  background: var(--color-burgundy);
  border-bottom: 1px solid rgba(212, 175, 55, 0.35);
  text-align: center;
  padding-block: 8px;
}

.announce-text {
  font-family: var(--font-data);
  font-size: 0.8125rem;
  color: var(--color-gold-soft);
  letter-spacing: 0.04em;
  line-height: 1.4;
}

/* ---------- 8. 头部主体 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--header-z);
  background: var(--color-deep-blue);
  border-bottom: 2px solid var(--color-gold);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-4);
  padding-block: var(--spacing-4);
}

/* 品牌区 */
.brand-lockup {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: #fff;
}

.brand-mark {
  display: inline-block;
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  background: var(--color-gold);
  border-radius: 3px;
  transform: rotate(45deg);
  box-shadow: 0 0 12px rgba(212, 175, 55, 0.4);
}

.brand-name {
  transition: color var(--transition-base);
}

.brand-logo:hover .brand-name {
  color: var(--color-gold-soft);
}

.brand-tagline {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  color: var(--color-body-muted);
  letter-spacing: 0.08em;
  padding-left: 24px;
}

/* 状态徽标 */
.header-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-body-muted);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  padding: 6px 14px;
  background: var(--color-glass);
  white-space: nowrap;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #4DB690;
  box-shadow: 0 0 8px rgba(77, 182, 144, 0.6);
  animation: status-pulse 2s ease-in-out infinite;
}

@keyframes status-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* 移动端导航按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  background: transparent;
  transition: border-color var(--transition-base), background var(--transition-base);
}

.nav-toggle:hover {
  border-color: var(--color-gold);
  background: var(--color-glass);
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 1px;
  background: var(--color-gold);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* 双层导航 */
.site-nav {
  border-top: 1px solid rgba(212, 175, 55, 0.15);
  background: var(--color-blue-mid);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-4);
}

.nav-primary {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.nav-primary a {
  display: block;
  padding: 16px 18px;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-body-light);
  border-bottom: 3px solid transparent;
  transition: color var(--transition-base), border-color var(--transition-base), background var(--transition-base);
}

.nav-primary a:hover {
  color: var(--color-gold);
  background: rgba(212, 175, 55, 0.08);
}

.nav-primary a[aria-current="page"] {
  color: var(--color-gold);
  border-bottom-color: var(--color-gold);
}

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

.nav-secondary a {
  display: block;
  padding: 14px;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-body-muted);
  transition: color var(--transition-base);
}

.nav-secondary a:hover {
  color: var(--color-gold-soft);
}

/* ---------- 9. 页脚 ---------- */
.site-footer {
  margin-top: auto;
  background: linear-gradient(180deg, var(--color-teal) 0%, var(--color-deep-blue) 100%);
  border-top: 3px solid var(--color-gold);
}

.footer-main {
  display: grid;
  grid-template-columns: 2.2fr 1fr 1fr 1.6fr;
  gap: var(--spacing-6);
  padding-block: var(--spacing-7);
}

/* 返回顶部按钮 */
.to-top {
  position: fixed;
  right: var(--spacing-5);
  bottom: var(--spacing-5);
  z-index: calc(var(--header-z) - 10);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-teal);
  border: 1px solid var(--color-gold);
  color: var(--color-gold);
  font-size: 1.125rem;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-base), background var(--transition-base), color var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.to-top:hover {
  background: var(--color-gold);
  color: var(--color-deep-blue);
  transform: translateY(-3px);
}

/* 页脚品牌与信任声明 */
.footer-brand {
  display: flex;
  flex-direction: column;
}

.footer-brand-name {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 800;
  color: #fff;
}

.footer-trust {
  margin-top: var(--spacing-3);
  max-width: 36em;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--color-body-muted);
}

.footer-service-time {
  margin-top: var(--spacing-3);
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--color-body-light);
}

/* 页脚导航列 */
.footer-nav-col {
  display: flex;
  flex-direction: column;
}

.footer-col-title {
  margin-bottom: var(--spacing-3);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-dark);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-body-light);
  transition: color var(--transition-base), padding-left var(--transition-base);
}

.footer-links a:hover {
  color: var(--color-gold-soft);
  padding-left: 6px;
}

/* 页脚联系信息 */
.footer-contact {
  display: flex;
  flex-direction: column;
}

.footer-contact-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-contact-list li {
  font-family: var(--font-body);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-body-muted);
}

.data-num {
  font-family: var(--font-data);
  font-size: 0.9375em;
  color: var(--color-gold);
}

/* 页脚底部 */
.footer-bottom {
  border-top: 1px solid rgba(212, 175, 55, 0.2);
  background: rgba(0, 0, 0, 0.25);
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-3);
  padding-block: var(--spacing-3);
  font-size: 0.8125rem;
  color: var(--color-body-muted);
}

.footer-copy,
.footer-icp {
  font-family: var(--font-data);
}

.footer-legal {
  display: flex;
  gap: var(--spacing-4);
}

.footer-legal a {
  color: var(--color-body-muted);
  transition: color var(--transition-base);
}

.footer-legal a:hover {
  color: var(--color-gold);
}

/* ---------- 10. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.4;
  text-align: center;
  cursor: pointer;
  transition: background var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-gold {
  background: var(--color-gold);
  color: var(--color-deep-blue);
}

.btn-gold:hover {
  background: var(--color-gold-soft);
  box-shadow: 0 4px 20px rgba(212, 175, 55, 0.35);
}

.btn-ghost {
  background: transparent;
  border-color: var(--color-gold);
  color: var(--color-body-light);
}

.btn-ghost:hover {
  background: rgba(212, 175, 55, 0.12);
  color: var(--color-gold);
}

/* ---------- 11. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: var(--spacing-5);
  font-family: var(--font-heading);
  font-size: 0.8125rem;
}

.breadcrumb a {
  color: var(--color-body-muted);
}

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

.breadcrumb [aria-current="page"] {
  color: var(--color-gold);
}

.breadcrumb-sep {
  color: var(--color-body-muted);
  opacity: 0.5;
}

/* ---------- 12. 通用组件 ---------- */
.card {
  background: var(--color-teal);
  padding: var(--spacing-5);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-panel);
}

.glass-panel {
  background: var(--color-glass);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-lg);
  padding: var(--spacing-5);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.tag {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid var(--color-border-dark);
  border-radius: 999px;
  background: rgba(212, 175, 55, 0.15);
  font-family: var(--font-heading);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gold-soft);
  white-space: nowrap;
}

.archive-list {
  display: flex;
  flex-direction: column;
}

.archive-list > * + * {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.entry-meta {
  font-family: var(--font-data);
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
  color: var(--color-body-muted);
}

/* 图片来源框架 */
.image-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: linear-gradient(135deg, var(--color-indigo), var(--color-teal));
}

.image-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-frame--circuit {
  background-image:
    linear-gradient(135deg, rgba(212, 175, 55, 0.12) 25%, transparent 25%),
    linear-gradient(225deg, rgba(212, 175, 55, 0.12) 25%, transparent 25%);
  background-size: 24px 24px;
}

.image-frame--landmark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 40%;
  background: linear-gradient(180deg, transparent, rgba(10, 30, 60, 0.85));
  z-index: 1;
}

/* ---------- 13. 响应式 ---------- */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-main {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-5);
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-contact {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  .container {
    padding-inline: var(--spacing-4);
  }

  .header-main {
    padding-block: var(--spacing-3);
  }

  .header-status {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
  }

  .site-nav[data-open] {
    max-height: 420px;
    overflow-y: auto;
  }

  .nav-inner {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-3);
    padding-block: var(--spacing-3);
  }

  .nav-primary {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-primary a {
    padding: 14px 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    border-left: 3px solid transparent;
  }

  .nav-primary a:hover {
    background: rgba(212, 175, 55, 0.06);
  }

  .nav-primary a[aria-current="page"] {
    border-left-color: var(--color-gold);
    border-bottom-color: transparent;
    background: rgba(212, 175, 55, 0.06);
  }

  .nav-secondary {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-top: var(--spacing-2);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
  }

  .nav-secondary a {
    padding: 10px 12px;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 0.9375rem;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .hero-split {
    grid-template-columns: 1fr;
    gap: var(--spacing-4);
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: var(--spacing-5);
    padding-block: var(--spacing-5);
  }

  .footer-bottom-inner {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-2);
  }

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

  .announce-text {
    font-size: 0.75rem;
  }

  .to-top {
    right: var(--spacing-3);
    bottom: var(--spacing-3);
    width: 42px;
    height: 42px;
  }
}

/* ---------- 14. 偏好减少动效 ---------- */
@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-behavior: auto !important;
  }

  .status-dot {
    animation: none;
  }
}