/* ===== Reset ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px;line-height:1.6;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:#0D1B2A;color:#333;min-height:100vh;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button,input{font:inherit;color:inherit;border:none;background:none;outline:none}
button{cursor:pointer}
:focus-visible{outline:2px solid #FFD700;outline-offset:2px;border-radius:4px}

/* ===== CSS Variables ===== */
:root{
  --color-primary:#0D1B2A;
  --color-gold:#FFD700;
  --color-secondary:#1B3A5C;
  --color-accent:#4A90D9;
  --color-white:#FFFFFF;
  --color-light-gray:#F5F5F5;
  --color-medium-gray:#CCCCCC;
  --color-dark-gray:#333333;
  --font-heading:700 1.75rem/1.2 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:300 1rem/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-data:300 1rem/1.5 "SF Mono","Fira Code","Consolas",monospace;
  --spacing-unit:8px;
  --container-max:1200px;
  --capsule-radius:48px;
  --transition-fast:0.2s ease;
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:0s!important;animation-duration:0s!important}
  html{scroll-behavior:auto}
}

/* ===== Utility ===== */
.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}
.container{max-width:var(--container-max);margin:0 auto;padding:0 20px}
.section-panel{padding:80px 20px;background:var(--color-white);margin:0}
.section-panel:nth-child(even){background:var(--color-light-gray)}
.skip-link{position:fixed;top:-100%;left:16px;z-index:10000;background:var(--color-gold);color:var(--color-primary);padding:8px 20px;border-radius:0 0 8px 8px;font-weight:600;font-size:14px;transition:top 0.2s}
.skip-link:focus{top:0}

/* ===== Scroll Progress ===== */
.scroll-progress{position:fixed;top:0;left:0;z-index:9999;height:3px;background:var(--color-gold);width:0%;transition:width 0.1s linear;pointer-events:none}

/* ===== Header 悬浮胶囊 ===== */
.site-header{position:fixed;top:12px;left:0;right:0;z-index:9000;display:flex;justify-content:center;pointer-events:none;padding:0 16px}
.header-capsule{pointer-events:auto;background:rgba(13,27,42,0.94);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-radius:var(--capsule-radius);box-shadow:0 8px 40px rgba(0,0,0,0.45),0 2px 8px rgba(0,0,0,0.3);display:flex;align-items:center;width:100%;max-width:var(--container-max);padding:0 24px;min-height:56px;gap:8px;border:1px solid rgba(255,215,0,0.08)}
.brand{font-size:20px;font-weight:800;color:var(--color-white);letter-spacing:1px;white-space:nowrap;padding:8px 0;margin-right:auto;flex-shrink:0}
.brand::after{content:"";width:6px;height:6px;display:inline-block;background:var(--color-gold);border-radius:50%;margin-left:4px;vertical-align:middle}

/* ===== Navigation ===== */
.nav{display:flex;align-items:center;gap:4px}
.nav-link{font-size:14px;font-weight:500;color:rgba(255,255,255,0.75);padding:8px 14px;border-radius:24px;transition:background var(--transition-fast),color var(--transition-fast);white-space:nowrap;letter-spacing:0.3px}
.nav-link:hover,.nav-link:focus-visible{background:rgba(255,215,0,0.12);color:var(--color-gold)}
.nav-link[aria-current="page"]{color:var(--color-gold);background:rgba(255,215,0,0.08);font-weight:600}

/* ===== Nav Toggle ===== */
.nav-toggle{display:none;flex-direction:column;justify-content:center;align-items:center;width:40px;height:40px;border-radius:50%;background:rgba(255,255,255,0.06);color:var(--color-white);gap:4px;flex-shrink:0;transition:background var(--transition-fast)}
.nav-toggle:hover{background:rgba(255,215,0,0.15)}
.nav-toggle-line{display:block;width:18px;height:2px;background:currentColor;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)}

/* ===== Search ===== */
.search-toggle{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;color:rgba(255,255,255,0.6);transition:background var(--transition-fast),color var(--transition-fast);flex-shrink:0}
.search-toggle:hover,.search-toggle[aria-expanded="true"]{background:rgba(255,215,0,0.12);color:var(--color-gold)}
.search-area{overflow:hidden;max-width:0;opacity:0;transition:max-width 0.35s ease,opacity 0.25s ease, margin 0.25s;margin:0;flex-shrink:1;flex-grow:0}
.search-area[data-open]{max-width:260px;opacity:1;margin:0 4px}
.search-input{width:100%;padding:8px 14px;border-radius:24px;background:rgba(255,255,255,0.08);color:var(--color-white);font-size:14px;border:1px solid rgba(255,255,255,0.1);transition:border-color var(--transition-fast),background var(--transition-fast)}
.search-input::placeholder{color:rgba(255,255,255,0.35)}
.search-input:focus{border-color:var(--color-gold);background:rgba(255,255,255,0.12)}

/* ===== Mobile Header ===== */
@media(max-width:820px){
  .site-header{top:0;padding:8px 12px}
  .header-capsule{border-radius:28px;padding:0 16px;min-height:52px;flex-wrap:wrap}
  .brand{font-size:17px}
  .nav{display:none;width:100%;flex-direction:column;padding:12px 0 16px;gap:2px;border-top:1px solid rgba(255,255,255,0.06);margin-top:4px}
  .nav[data-open]{display:flex}
  .nav-toggle{display:flex}
  .nav-link{padding:10px 16px;width:100%;border-radius:12px;font-size:15px}
  .search-area[data-open]{max-width:100%;width:100%;margin:4px 0 8px}
  .search-input{width:100%}
  .search-toggle{margin-left:auto}
}
@media(max-width:480px){
  .header-capsule{border-radius:20px;padding:0 12px}
  .brand{font-size:15px;letter-spacing:0.5px}
  .nav-link{font-size:14px;padding:8px 14px}
}

/* ===== Footer ===== */
.site-footer{background:var(--color-primary);color:rgba(255,255,255,0.8);padding:60px 20px 0;font-size:14px;line-height:1.7}
.footer-grid{max-width:var(--container-max);margin:0 auto;display:grid;grid-template-columns:1.5fr 1fr 1.4fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,0.06)}
.footer-logo{font-size:22px;font-weight:800;color:var(--color-white);letter-spacing:1px;display:inline-block;margin-bottom:12px}
.footer-logo::after{content:"";width:6px;height:6px;display:inline-block;background:var(--color-gold);border-radius:50%;margin-left:4px;vertical-align:middle}
.footer-tagline{color:rgba(255,255,255,0.5);font-size:13px;line-height:1.6;max-width:300px}
.footer-heading{font-size:12px;font-weight:700;color:var(--color-gold);text-transform:uppercase;letter-spacing:1.5px;margin-bottom:16px;opacity:0.8}
.footer-link{display:block;color:rgba(255,255,255,0.65);padding:3px 0;transition:color var(--transition-fast);font-size:14px}
.footer-link:hover,.footer-link:focus-visible{color:var(--color-gold)}
.footer-text{color:rgba(255,255,255,0.55);font-size:13px;line-height:1.6;margin-bottom:4px}
.footer-text .footer-link{display:inline;padding:0}
.footer-note{font-size:12px;color:rgba(255,255,255,0.35);margin-top:8px}
.footer-bottom{max-width:var(--container-max);margin:0 auto;padding:20px 0 32px;display:flex;justify-content:center;align-items:center}
.footer-copy{color:rgba(255,255,255,0.3);font-size:12px;letter-spacing:0.5px;text-align:center}

@media(max-width:820px){
  .site-footer{padding:40px 20px 0}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
  .footer-tagline{max-width:none}
}
@media(max-width:480px){
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .footer-bottom{padding:16px 0 24px}
  .footer-copy{font-size:11px}
}

/* ===== Buttons ===== */
.btn{display:inline-block;padding:12px 32px;border-radius:48px;font-size:15px;font-weight:600;letter-spacing:0.5px;transition:background var(--transition-fast),transform var(--transition-fast),box-shadow var(--transition-fast);cursor:pointer}
.btn-primary{background:var(--color-gold);color:var(--color-primary)}
.btn-primary:hover,.btn-primary:focus-visible{background:#e6c200;transform:translateY(-1px);box-shadow:0 6px 20px rgba(255,215,0,0.25)}
.btn-outline{background:transparent;border:1.5px solid var(--color-gold);color:var(--color-gold)}
.btn-outline:hover,.btn-outline:focus-visible{background:rgba(255,215,0,0.08);border-color:#e6c200;color:#e6c200}

/* ===== Breadcrumb ===== */
.breadcrumb{display:flex;align-items:center;gap:8px;padding:16px 20px;max-width:var(--container-max);margin:0 auto;font-size:13px;color:rgba(255,255,255,0.4)}
.breadcrumb a{color:rgba(255,255,255,0.6);transition:color var(--transition-fast)}
.breadcrumb a:hover{color:var(--color-gold)}
.breadcrumb span{color:rgba(255,255,255,0.3)}
.breadcrumb-sep{margin:0 4px;color:rgba(255,255,255,0.2)}

/* ===== Section Panel ===== */
.section-panel{padding:80px 20px;background:var(--color-white);margin:0}
.section-panel:nth-child(even){background:var(--color-light-gray)}
.panel-inner{max-width:var(--container-max);margin:0 auto}

/* ===== Responsive Images ===== */
.img-wrap{position:relative;overflow:hidden;border-radius:12px;background:var(--color-medium-gray);aspect-ratio:16/9}
.img-wrap img{width:100%;height:100%;object-fit:cover}
.img-caption{font-size:13px;color:var(--color-dark-gray);margin-top:8px;opacity:0.7}

/* ===== Data Highlight ===== */
.data-highlight{font-family:var(--font-data);color:var(--color-gold);font-weight:400}

/* ===== Card ===== */
.card{background:var(--color-white);border-radius:16px;padding:24px;box-shadow:0 2px 12px rgba(0,0,0,0.04);transition:box-shadow var(--transition-fast),transform var(--transition-fast)}
.card:hover{box-shadow:0 8px 32px rgba(0,0,0,0.08);transform:translateY(-2px)}

/* ===== Responsive ===== */
@media(max-width:820px){
  .section-panel{padding:48px 20px}
  .container{padding:0 16px}
  :root{--font-heading:700 1.4rem/1.2 sans-serif}
}
@media(max-width:480px){
  .section-panel{padding:32px 16px}
  :root{--font-heading:700 1.2rem/1.2 sans-serif}
}