/* ===== RESET & VARIABLES ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --戈壁黄: #C8A96E;
  --天山蓝: #3A6B8F;
  --雪白: #F5F5F0;
  --赛博橙: #FF6B35;
  --霓虹绿: #00E676;
  --深色背景: #1A1A1A;
  --浅色背景: #FAFAF5;
  --正文灰: #2C2C2C;
  --高亮数据: #FFB300;
  --标题字体: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --正文字体: 'Inter', -apple-system, 'Helvetica Neue', Arial, sans-serif;
  --数字字体: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --max-width: 1200px;
  --header-height: 64px;
  --radius: 9999px;
  --radius-sm: 8px;
}
html { scroll-behavior: smooth; }
body { font-family: var(--正文字体); color: var(--正文灰); background: var(--浅色背景); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--天山蓝); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--赛博橙); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
h1, h2, h3, h4 { font-family: var(--标题字体); font-weight: 700; line-height: 1.2; letter-spacing: 0.01em; }
h1 { font-size: clamp(2.2rem, 6vw, 4rem); }
h2 { font-size: clamp(1.6rem, 4vw, 2.8rem); }
h3 { font-size: clamp(1.2rem, 3vw, 2rem); }
p { margin-bottom: 1rem; max-width: 70ch; }
:focus-visible { outline: 3px solid var(--赛博橙); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition-duration: 0s !important; animation-duration: 0s !important; } }

/* ===== CONTAINER & GRID ===== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--spacing-md); }
.grid { display: grid; gap: var(--spacing-lg); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 768px) { .grid-cols-2, .grid-cols-3 { grid-template-columns: 1fr; } }

/* ===== SKIP LINK ===== */
.skip-link { position: fixed; top: -100px; left: var(--spacing-md); z-index: 10000; background: var(--赛博橙); color: #fff; padding: var(--spacing-sm) var(--spacing-md); border-radius: var(--radius-sm); font-weight: 600; transition: top 0.2s; }
.skip-link:focus { top: var(--spacing-sm); }

/* ===== SCROLL PROGRESS ===== */
.scroll-progress { position: fixed; top: 0; left: 0; height: 3px; width: 0%; background: linear-gradient(90deg, var(--赛博橙), var(--霓虹绿)); z-index: 9999; transition: width 0.1s linear; }

/* ===== HEADER ===== */
.site-header { position: fixed; top: 3px; left: 0; right: 0; z-index: 9000; background: rgba(250, 250, 245, 0.88); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid rgba(58, 107, 143, 0.12); height: var(--header-height); display: flex; align-items: center; transition: background 0.3s; }
.header-inner { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--spacing-lg); width: 100%; display: flex; align-items: center; gap: var(--spacing-lg); position: relative; }
.brand { font-family: var(--标题字体); font-size: 1.6rem; font-weight: 700; color: var(--戈壁黄); letter-spacing: 0.04em; white-space: nowrap; text-shadow: 0 1px 3px rgba(0,0,0,0.04); flex-shrink: 0; }

/* ===== NAVIGATION ===== */
.nav-capsule { display: flex; align-items: center; gap: var(--spacing-xs); background: rgba(245, 245, 240, 0.6); border-radius: var(--radius); padding: 4px; border: 1px solid rgba(58, 107, 143, 0.15); flex: 1; justify-content: center; }
.nav-link { font-family: var(--正文字体); font-size: 0.9rem; font-weight: 500; padding: 6px 18px; border-radius: var(--radius); color: var(--正文灰); transition: all 0.2s; white-space: nowrap; letter-spacing: 0.02em; }
.nav-link:hover { background: rgba(58, 107, 143, 0.08); color: var(--天山蓝); }
.nav-link[aria-current="page"] { background: var(--天山蓝); color: #fff; box-shadow: 0 2px 8px rgba(58, 107, 143, 0.25); }
.nav-link[aria-current="page"]:hover { background: var(--天山蓝); color: #fff; }

/* ===== COUNTDOWN ===== */
.countdown-widget { display: flex; align-items: center; gap: var(--spacing-sm); background: var(--天山蓝); padding: 6px 16px; border-radius: var(--radius); color: #fff; flex-shrink: 0; box-shadow: 0 2px 10px rgba(58, 107, 143, 0.2); }
.countdown-label { font-size: 0.7rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; opacity: 0.85; }
.countdown-digits { font-family: var(--数字字体); font-size: 1.2rem; font-weight: 600; color: var(--赛博橙); min-width: 3.8ch; text-align: center; letter-spacing: 0.04em; }

/* ===== NAV TOGGLE (mobile) ===== */
.nav-toggle { display: none; flex-direction: column; justify-content: center; align-items: center; width: 40px; height: 40px; background: none; border: 2px solid var(--天山蓝); border-radius: var(--radius-sm); cursor: pointer; gap: 4px; padding: 6px; flex-shrink: 0; transition: border-color 0.2s; }
.nav-toggle:hover { border-color: var(--赛博橙); }
.nav-toggle-line { display: block; width: 20px; height: 2px; background: var(--天山蓝); border-radius: 2px; transition: transform 0.3s, opacity 0.3s; }
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
.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: rotate(-45deg) translate(4px, -4px); }

/* ===== FOOTER ===== */
.site-footer { background: var(--深色背景); color: rgba(245, 245, 240, 0.8); padding: var(--spacing-xl) 0 var(--spacing-lg); border-top: 4px solid var(--天山蓝); position: relative; }
.site-footer::before { content: ''; position: absolute; top: -4px; left: 0; right: 0; height: 4px; background: linear-gradient(90deg, var(--戈壁黄), var(--天山蓝), var(--霓虹绿)); }
.footer-inner { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--spacing-lg); }
.footer-main { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: space-between; gap: var(--spacing-lg); padding-bottom: var(--spacing-lg); border-bottom: 1px solid rgba(200, 169, 110, 0.2); }
.footer-brand { font-family: var(--标题字体); font-size: 1.8rem; font-weight: 700; color: var(--戈壁黄); letter-spacing: 0.04em; }
.footer-tagline { font-size: 0.85rem; color: rgba(245, 245, 240, 0.5); margin-top: var(--spacing-xs); width: 100%; }
.footer-links { display: flex; flex-wrap: wrap; gap: var(--spacing-md); align-items: center; }
.footer-link { color: rgba(245, 245, 240, 0.7); font-size: 0.9rem; padding: 4px 12px; border: 1px solid transparent; border-radius: var(--radius-sm); transition: all 0.2s; }
.footer-link:hover { color: var(--戈壁黄); border-color: rgba(200, 169, 110, 0.3); background: rgba(200, 169, 110, 0.06); }
.footer-link-highlight { border-color: rgba(0, 230, 118, 0.2); color: var(--霓虹绿); }
.footer-link-highlight:hover { border-color: var(--霓虹绿); color: var(--霓虹绿); background: rgba(0, 230, 118, 0.06); }
.footer-contact { display: flex; flex-wrap: wrap; gap: var(--spacing-lg); padding: var(--spacing-md) 0; font-size: 0.85rem; color: rgba(245, 245, 240, 0.6); border-bottom: 1px solid rgba(200, 169, 110, 0.1); }
.footer-contact span { display: flex; align-items: center; gap: var(--spacing-xs); }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: var(--spacing-sm); padding-top: var(--spacing-md); font-size: 0.8rem; color: rgba(245, 245, 240, 0.4); }
.footer-icp { font-family: var(--数字字体); letter-spacing: 0.02em; }
.footer-note { opacity: 0.6; }
.footer-copy { font-family: var(--正文字体); }

/* ===== BUTTONS ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--spacing-sm); font-family: var(--正文字体); font-size: 0.95rem; font-weight: 600; padding: 10px 28px; border-radius: var(--radius); border: 2px solid transparent; cursor: pointer; transition: all 0.25s; letter-spacing: 0.02em; }
.btn-primary { background: var(--赛博橙); color: #fff; border-color: var(--赛博橙); box-shadow: 0 4px 14px rgba(255, 107, 53, 0.25); }
.btn-primary:hover { background: #e55a2b; border-color: #e55a2b; color: #fff; transform: translateY(-1px); box-shadow: 0 6px 20px rgba(255, 107, 53, 0.35); }
.btn-secondary { background: transparent; color: var(--天山蓝); border-color: var(--天山蓝); }
.btn-secondary:hover { background: var(--天山蓝); color: #fff; }
.btn-ghost { background: transparent; color: var(--正文灰); border-color: transparent; }
.btn-ghost:hover { background: rgba(58, 107, 143, 0.06); color: var(--天山蓝); }

/* ===== BREADCRUMB ===== */
.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: var(--spacing-xs); font-size: 0.85rem; color: rgba(44, 44, 44, 0.5); padding: var(--spacing-sm) 0; }
.breadcrumb a { color: var(--天山蓝); }
.breadcrumb a:hover { color: var(--赛博橙); }
.breadcrumb-sep { color: var(--天山蓝); opacity: 0.3; margin: 0 4px; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .nav-capsule { gap: 2px; }
  .nav-link { font-size: 0.8rem; padding: 5px 14px; }
  .countdown-digits { font-size: 1rem; min-width: 3.4ch; }
}
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-capsule { position: absolute; top: calc(var(--header-height) - 4px); left: var(--spacing-md); right: var(--spacing-md); flex-direction: column; background: var(--雪白); border-radius: var(--radius-sm); padding: var(--spacing-sm); box-shadow: 0 8px 30px rgba(0,0,0,0.12); border: 1px solid rgba(58, 107, 143, 0.1); gap: 2px; display: none; }
  .nav-capsule[data-open] { display: flex; }
  .nav-link { width: 100%; text-align: center; padding: 10px 16px; font-size: 1rem; border-radius: var(--radius-sm); }
  .countdown-widget { padding: 4px 12px; }
  .countdown-digits { font-size: 0.95rem; min-width: 3ch; }
  .countdown-label { font-size: 0.6rem; }
  .brand { font-size: 1.3rem; }
  .header-inner { padding: 0 var(--spacing-md); gap: var(--spacing-sm); }
  .footer-main { flex-direction: column; gap: var(--spacing-md); }
  .footer-links { width: 100%; }
  .footer-contact { flex-direction: column; gap: var(--spacing-sm); }
  .footer-bottom { flex-direction: column; text-align: center; gap: var(--spacing-sm); }
}
@media (max-width: 480px) {
  .brand { font-size: 1.1rem; }
  .countdown-digits { font-size: 0.85rem; min-width: 2.8ch; }
  .countdown-widget { padding: 3px 10px; }
  .nav-link { font-size: 0.9rem; padding: 8px 12px; }
  .footer-brand { font-size: 1.4rem; }
}

/* ===== IMAGE CONTAINER (base) ===== */
.img-container { position: relative; overflow: hidden; background: rgba(200, 169, 110, 0.08); border-radius: var(--radius-sm); aspect-ratio: 16 / 9; display: flex; align-items: center; justify-content: center; color: rgba(44, 44, 44, 0.2); font-size: 0.85rem; border: 1px dashed rgba(58, 107, 143, 0.12); }
.img-container img { width: 100%; height: 100%; object-fit: cover; }
.img-container--tall { aspect-ratio: 4 / 5; }
.img-container--square { aspect-ratio: 1 / 1; }