/* ===== reset ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{min-height:100vh;line-height:1.6;font-family:'IBM Plex Sans',system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;font-size:16px;color:#3A2A1A;background:#FFF8E7;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
img,svg{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button,input{font:inherit;color:inherit;border:none;background:none;cursor:pointer}
button:focus-visible,input:focus-visible{outline:2px solid #D4AF37;outline-offset:2px}
:focus-visible{outline:2px solid #D4AF37;outline-offset:2px}
.skip-link:not(:focus):not(:focus-visible){position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
.skip-link{position:absolute;top:0;left:0;z-index:2000;padding:12px 24px;background:#4A0E4E;color:#D4AF37;font-weight:700;transform:translateY(-100%);transition:transform 0.3s ease}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

/* ===== variables ===== */
:root{--primary-deep-purple:#4A0E4E;--primary-gold:#D4AF37;--accent-neon-blue:#00D4FF;--background-cream:#FFF8E7;--text-dark-brown:#2C1A0E;--text-body:#3A2A1A;--surface-glass:rgba(74,14,78,0.15);--highlight-red-orange:#FF6B35;--heading-font:'Compacta Bold',Impact,'Arial Black',sans-serif;--body-font:'IBM Plex Sans',system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;--header-height:68px;--content-max-width:1200px;--grid-gap:24px;--border-radius:8px;--shadow-card:0 4px 20px rgba(74,14,78,0.12);--shadow-glass:0 8px 32px rgba(74,14,78,0.18)}

/* ===== typography ===== */
h1,h2,h3,h4,h5,h6{font-family:var(--heading-font);letter-spacing:-0.02em;line-height:1.1;color:var(--primary-deep-purple)}
h1{font-size:clamp(2.8rem,8vw,5.6rem)}h2{font-size:clamp(2rem,5vw,3.2rem)}h3{font-size:clamp(1.4rem,3vw,2rem)}h4{font-size:clamp(1.1rem,2vw,1.4rem)}
p{font-family:var(--body-font);line-height:1.6;color:var(--text-body);max-width:72ch}
.section-title{background:linear-gradient(135deg,#4A0E4E,#D4AF37);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

/* ===== header ===== */
.site-header{position:fixed;top:0;left:0;right:0;z-index:1000;height:var(--header-height);background:transparent;transition:background 0.4s ease,box-shadow 0.4s ease;color:#FFF8E7}
.site-header[data-scrolled="true"]{background:#4A0E4E;box-shadow:0 2px 24px rgba(74,14,78,0.35)}
.site-header[data-scrolled="true"] .brand-name,.site-header[data-scrolled="true"] .brand-sub{color:#D4AF37}
.site-header[data-scrolled="true"] .nav-link{color:#FFF8E7}
.site-header[data-scrolled="true"] .nav-link:hover,.site-header[data-scrolled="true"] .nav-link:focus-visible{color:#D4AF37}
.header-inner{display:flex;align-items:center;justify-content:space-between;max-width:var(--content-max-width);margin:0 auto;padding:0 24px;height:100%}
.header-brand{display:flex;align-items:center;flex-shrink:0}
.brand-link{display:flex;flex-direction:column;line-height:1.1}
.brand-name{font-family:var(--heading-font);font-size:1.6rem;color:#D4AF37;letter-spacing:-0.02em;transition:color 0.3s ease}
.brand-sub{font-family:var(--body-font);font-size:0.65rem;font-weight:600;color:rgba(255,255,255,0.7);letter-spacing:0.08em;text-transform:uppercase;transition:color 0.3s ease}
.header-nav{display:flex;align-items:center}
.nav-list{display:flex;gap:8px}
.nav-link{display:block;padding:8px 14px;font-family:var(--body-font);font-size:0.88rem;font-weight:500;color:rgba(255,255,248,0.85);border-radius:6px;transition:color 0.25s ease,background 0.25s ease;white-space:nowrap}
.nav-link:hover,.nav-link:focus-visible{color:#D4AF37;background:rgba(212,175,55,0.12)}
.nav-link[aria-current="page"]{color:#D4AF37;background:rgba(212,175,55,0.18);font-weight:700}
.header-actions{display:flex;align-items:center;gap:16px;flex-shrink:0}
.search-icon{display:flex;align-items:center;justify-content:center;width:36px;height:36px;color:rgba(255,255,248,0.8);border-radius:50%;transition:color 0.25s ease,background 0.25s ease}
.search-icon:hover,.search-icon:focus-visible{color:#D4AF37;background:rgba(212,175,55,0.12)}
.lang-switch{font-family:var(--body-font);font-size:0.8rem;font-weight:600;color:rgba(255,255,248,0.7);letter-spacing:0.04em;padding:4px 8px;border:1px solid rgba(255,255,248,0.25);border-radius:4px;line-height:1}
.site-header[data-scrolled="true"] .lang-switch{border-color:rgba(212,175,55,0.4);color:#D4AF37}
.nav-toggle{display:none;flex-direction:column;justify-content:center;align-items:center;width:40px;height:40px;gap:5px;padding:8px;border-radius:6px;transition:background 0.2s ease}
.nav-toggle:hover,.nav-toggle:focus-visible{background:rgba(212,175,55,0.15)}
.nav-toggle-line{display:block;width:24px;height:2px;background:#FFF8E7;border-radius:2px;transition:transform 0.3s ease,opacity 0.3s ease}
[data-open] .nav-toggle-line:nth-child(1){transform:translateY(7px) rotate(45deg)}
[data-open] .nav-toggle-line:nth-child(2){opacity:0}
[data-open] .nav-toggle-line:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== scroll progress ===== */
.scroll-progress-track{position:absolute;bottom:0;left:0;right:0;height:3px;background:rgba(255,255,248,0.15);overflow:hidden}
.scroll-progress-bar{display:block;height:100%;width:0%;background:linear-gradient(90deg,#D4AF37,#00D4FF);transition:width 0.1s linear;will-change:width}
.site-header:not([data-scrolled="true"]) .scroll-progress-track{opacity:0;transition:opacity 0.4s ease}

/* ===== mobile nav ===== */
@media(max-width:820px){
  .nav-toggle{display:flex}
  .header-nav{position:fixed;top:var(--header-height);left:0;right:0;bottom:0;background:#4A0E4E;padding:32px 24px;transform:translateX(100%);transition:transform 0.4s cubic-bezier(0.22,1,0.36,1),opacity 0.3s ease;opacity:0;overflow-y:auto;z-index:999}
  .header-nav[data-open]{transform:translateX(0);opacity:1}
  .nav-list{flex-direction:column;gap:4px}
  .nav-link{padding:14px 20px;font-size:1.1rem;border-radius:8px;color:#FFF8E7}
  .nav-link:hover,.nav-link:focus-visible{background:rgba(212,175,55,0.15);color:#D4AF37}
  .nav-link[aria-current="page"]{background:rgba(212,175,55,0.2);color:#D4AF37}
  .header-actions{gap:10px}
  .lang-switch{font-size:0.75rem;padding:2px 6px}
}

/* ===== footer ===== */
.site-footer{background:#4A0E4E;color:#FFF8E7;padding:60px 24px 32px}
.footer-inner{max-width:var(--content-max-width);margin:0 auto}
.footer-brand{margin-bottom:40px}
.footer-brand .brand-name{font-family:var(--heading-font);font-size:2rem;color:#D4AF37;letter-spacing:-0.02em}
.footer-brand .brand-sub{font-family:var(--body-font);font-size:0.75rem;font-weight:600;color:rgba(255,255,248,0.55);letter-spacing:0.1em;text-transform:uppercase;margin-top:2px}
.footer-columns{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;margin-bottom:48px}
.footer-col{min-width:0}
.footer-heading{font-family:var(--heading-font);font-size:1.1rem;color:#D4AF37;margin-bottom:16px;letter-spacing:-0.01em}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{font-family:var(--body-font);font-size:0.9rem;color:rgba(255,255,248,0.75);transition:color 0.25s ease,padding-left 0.25s ease;padding-left:0}
.footer-links a:hover,.footer-links a:focus-visible{color:#D4AF37;padding-left:4px}
.footer-contact p{font-family:var(--body-font);font-size:0.88rem;color:rgba(255,255,248,0.75);line-height:1.7;margin-bottom:4px}
.footer-contact p:last-child{margin-bottom:0}
.footer-bottom{border-top:1px solid rgba(212,175,55,0.2);padding-top:24px;display:flex;flex-wrap:wrap;gap:12px 24px;align-items:center;justify-content:center;text-align:center}
.footer-icp,.footer-copyright,.footer-note{font-family:var(--body-font);font-size:0.78rem;color:rgba(255,255,248,0.5)}
.footer-note{width:100%;margin-top:4px;font-style:italic}
@media(max-width:768px){
  .footer-columns{grid-template-columns:1fr;gap:32px}
  .footer-bottom{flex-direction:column;gap:8px}
}

/* ===== shared components ===== */
.glass-card{background:rgba(255,255,248,0.55);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid rgba(212,175,55,0.18);border-radius:var(--border-radius);padding:24px;box-shadow:var(--shadow-glass);transition:transform 0.3s ease,box-shadow 0.3s ease}
.glass-card:hover{transform:translateY(-4px);box-shadow:0 12px 40px rgba(74,14,78,0.2)}
.btn-gold{display:inline-flex;align-items:center;justify-content:center;padding:12px 32px;font-family:var(--body-font);font-weight:600;font-size:0.95rem;color:#FFF8E7;background:linear-gradient(135deg,#D4AF37,#b8962e);border-radius:var(--border-radius);transition:background 0.3s ease,transform 0.2s ease;box-shadow:0 4px 14px rgba(212,175,55,0.3)}
.btn-gold:hover,.btn-gold:focus-visible{background:linear-gradient(135deg,#b8962e,#a07d1f);transform:translateY(-2px)}
.btn-outline{display:inline-flex;align-items:center;justify-content:center;padding:10px 28px;font-family:var(--body-font);font-weight:600;font-size:0.9rem;color:#D4AF37;border:2px solid #D4AF37;border-radius:var(--border-radius);background:transparent;transition:background 0.3s ease,color 0.3s ease}
.btn-outline:hover,.btn-outline:focus-visible{background:#D4AF37;color:#4A0E4E}
.grid-8{display:grid;grid-template-columns:repeat(8,1fr);gap:var(--grid-gap)}
.img-container{position:relative;width:100%;border-radius:var(--border-radius);overflow:hidden;background:rgba(212,175,55,0.08)}
.img-container::before{content:"";display:block;padding-bottom:56.25%}
.img-placeholder{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,rgba(74,14,78,0.06),rgba(212,175,55,0.1));border:1px dashed rgba(212,175,55,0.25);border-radius:var(--border-radius);font-family:var(--body-font);font-size:0.85rem;color:rgba(74,14,78,0.35)}
.img-placeholder::after{content:"📷 图片占位"}
.diagonal-split{display:grid;grid-template-columns:1fr 1fr;gap:0;position:relative;overflow:hidden}
.diagonal-split::before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,transparent 48%,rgba(212,175,55,0.06) 48.5%,rgba(212,175,55,0.06) 51.5%,transparent 52%);pointer-events:none}
.time-axis{display:flex;align-items:center;gap:12px;padding:12px 0;position:relative}
.time-axis::before{content:"";flex:1;height:2px;background:linear-gradient(90deg,#D4AF37,transparent)}
.time-axis-label{font-family:var(--heading-font);font-size:0.85rem;color:#D4AF37;letter-spacing:0.04em;white-space:nowrap}

/* ===== utilities ===== */
.content-container{max-width:var(--content-max-width);margin:0 auto;padding:0 24px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}

/* ===== reduced motion ===== */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:0.01ms!important;animation-iteration-count:1!important;transition-duration:0.01ms!important}
  html{scroll-behavior:auto}
  .glass-card:hover{transform:none}
  .btn-gold:hover,.btn-outline:hover{transform:none}
  .header-nav{transition:none}
  .scroll-progress-bar{transition:none}
}

/* ===== responsive adjustments ===== */
@media(max-width:1024px){
  .grid-8{grid-template-columns:repeat(4,1fr)}
  .diagonal-split{grid-template-columns:1fr}
  .diagonal-split::before{display:none}
}
@media(max-width:480px){
  :root{--header-height:60px}
  .header-inner{padding:0 16px}
  .brand-name{font-size:1.3rem}
  .brand-sub{font-size:0.55rem}
  .site-footer{padding:40px 16px 24px}
  .footer-columns{gap:24px}
  .footer-brand .brand-name{font-size:1.6rem}
}