/* ===== RESET & BASE ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,"Helvetica Neue",Arial,sans-serif;font-weight:400;line-height:1.6;color:#E0E6ED;background-color:#0B1A2E;min-height:100vh;display:flex;flex-direction:row;overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button{cursor:pointer;font:inherit;color:inherit;background:none;border:none;outline:none}
:focus-visible{outline:2px solid #00FF88;outline-offset:2px}

/* ===== CSS VARIABLES ===== */
:root{
  --color-bg:#0B1A2E;
  --color-card:#1A2D44;
  --color-primary:#00FF88;
  --color-accent:#FF6B35;
  --color-text:#E0E6ED;
  --color-text-secondary:#8899AA;
  --color-glass:rgba(255,255,255,0.08);
  --color-border:rgba(255,255,255,0.1);
  --color-primary-dim:rgba(0,255,136,0.15);
  --color-accent-dim:rgba(255,107,53,0.15);
  --nav-width-expanded:220px;
  --nav-width-collapsed:68px;
  --header-top-height:0px;
  --transition-speed:0.35s;
  --font-display:"Impact","Arial Black","Helvetica Neue",Arial,sans-serif;
  --font-mono:"Courier New","Consolas","Liberation Mono",monospace;
}

/* ===== SKIP LINK ===== */
.skip-link{
  position:fixed;top:-100px;left:16px;z-index:10000;
  background:#00FF88;color:#0B1A2E;padding:8px 20px;border-radius:0 0 6px 6px;
  font-weight:700;font-size:0.875rem;transition:top 0.3s ease
}
.skip-link:focus{top:0}

/* ===== SITE HEADER (左侧品牌轨道) ===== */
.site-header{
  position:fixed;top:0;left:0;height:100vh;z-index:1000;
  display:flex;flex-direction:column;
  background:var(--color-glass);backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-right:1px solid var(--color-border);
  width:var(--nav-width-expanded);
  transition:width var(--transition-speed) ease,transform var(--transition-speed) ease;
  overflow:hidden;flex-shrink:0
}
.site-header[data-open="false"]{width:var(--nav-width-collapsed)}
.site-header[data-open="false"] .brand-name,
.site-header[data-open="false"] .nav-label,
.site-header[data-open="false"] .header-decor{display:none}
.site-header[data-open="false"] .nav-index{font-size:1.1rem}
.site-header[data-open="false"] .brand-mark{font-size:1.8rem}
.site-header[data-open="false"] .brand-rail{padding:16px 10px}

/* brand rail */
.brand-rail{
  display:flex;align-items:center;justify-content:space-between;
  padding:20px 16px;border-bottom:1px solid var(--color-border);
  flex-shrink:0;gap:8px
}
.brand-link{
  display:flex;align-items:baseline;gap:8px;white-space:nowrap
}
.brand-mark{
  font-family:var(--font-display);font-size:2.2rem;font-weight:900;
  color:var(--color-primary);line-height:1;letter-spacing:-0.02em
}
.brand-name{
  font-size:0.85rem;font-weight:600;color:var(--color-text);
  letter-spacing:0.06em;text-transform:uppercase;opacity:0.85
}

/* hamburger toggle */
.nav-toggle{
  position:relative;width:28px;height:28px;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:4px;flex-shrink:0;
  border-radius:4px;transition:background 0.2s
}
.nav-toggle:hover{background:var(--color-primary-dim)}
.toggle-bar{
  display:block;width:18px;height:2px;background:var(--color-text);
  border-radius:2px;transition:all 0.3s ease;transform-origin:center
}
.site-header[data-open="false"] .toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg);width:20px}
.site-header[data-open="false"] .toggle-bar:nth-child(2){opacity:0}
.site-header[data-open="false"] .toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg);width:20px}

/* navigation */
.site-nav{
  flex:1;display:flex;flex-direction:column;overflow-y:auto;
  padding:12px 0
}
.nav-list{display:flex;flex-direction:column;gap:2px;padding:0 8px}
.nav-item{display:flex}
.nav-link{
  display:flex;align-items:center;gap:10px;
  padding:12px 10px;border-radius:8px;
  font-size:0.9rem;font-weight:500;color:var(--color-text-secondary);
  transition:all 0.2s ease;white-space:nowrap;
  border-left:3px solid transparent
}
.nav-link:hover{color:var(--color-text);background:var(--color-primary-dim)}
.nav-link[aria-current="page"]{
  color:var(--color-primary);background:var(--color-primary-dim);
  border-left-color:var(--color-primary);font-weight:600
}
.nav-index{
  font-family:var(--font-mono);font-size:0.8rem;font-weight:600;
  min-width:1.8em;text-align:right;opacity:0.6;letter-spacing:0.02em
}
.nav-link[aria-current="page"] .nav-index{opacity:1;color:var(--color-primary)}

/* header decor (live score) */
.header-decor{
  display:flex;align-items:center;justify-content:center;gap:6px;
  padding:14px 8px;border-top:1px solid var(--color-border);
  font-family:var(--font-mono);font-size:1.2rem;flex-shrink:0;
  color:var(--color-accent);background:var(--color-accent-dim)
}
.decor-score{font-weight:700;font-size:1.3rem;animation:pulse-score 1.8s ease-in-out infinite}
.decor-score--1{animation-delay:0s}
.decor-score--2{animation-delay:0.6s}
.decor-sep{color:var(--color-text-secondary);font-weight:300}
.decor-status{font-size:0.6rem;font-weight:700;color:var(--color-primary);text-transform:uppercase;letter-spacing:0.1em;margin-left:4px}
@keyframes pulse-score{0%,100%{opacity:1}50%{opacity:0.4}}

/* ===== MAIN CONTENT ===== */
#main-content{flex:1;margin-left:var(--nav-width-expanded);min-height:100vh;transition:margin-left var(--transition-speed) ease}
.site-header[data-open="false"] ~ #main-content{margin-left:var(--nav-width-collapsed)}
.page-container{max-width:1200px;margin:0 auto;padding:32px 40px 60px}

/* ===== SITE FOOTER ===== */
.site-footer{
  background:var(--color-card);border-top:1px solid var(--color-border);
  padding:40px 40px 20px;margin-top:60px
}
.footer-content{
  display:grid;grid-template-columns:1fr 1fr 1.5fr;gap:32px;
  max-width:1200px;margin:0 auto 24px
}
.footer-brand{display:flex;flex-direction:column;gap:6px}
.footer-brand-mark{
  font-family:var(--font-display);font-size:2rem;font-weight:900;
  color:var(--color-primary);line-height:1
}
.footer-brand-name{font-size:1.1rem;font-weight:700;color:var(--color-text)}
.footer-tagline{font-size:0.85rem;color:var(--color-text-secondary);line-height:1.5}
.footer-links{display:flex;flex-direction:column;gap:10px;padding-top:4px}
.footer-link{color:var(--color-text-secondary);font-size:0.9rem;transition:color 0.2s}
.footer-link:hover{color:var(--color-primary)}
.footer-info{display:flex;flex-direction:column;gap:8px;font-size:0.85rem;color:var(--color-text-secondary);line-height:1.6}
.footer-icp{color:var(--color-text);font-weight:500}
.footer-contact{display:flex;flex-wrap:wrap;gap:4px}
.contact-sep{color:var(--color-border);padding:0 4px}
.footer-address{color:var(--color-text-secondary)}
.footer-trust{
  max-width:1200px;margin:0 auto 16px;padding:14px 20px;
  background:var(--color-glass);border-radius:8px;
  font-size:0.8rem;color:var(--color-text-secondary);line-height:1.6;
  border-left:3px solid var(--color-accent)
}
.footer-copy{
  text-align:center;font-size:0.8rem;color:var(--color-text-secondary);
  border-top:1px solid var(--color-border);padding-top:16px;
  max-width:1200px;margin:0 auto
}

/* ===== GENERIC COMPONENTS ===== */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 24px;border-radius:6px;font-weight:600;font-size:0.9rem;
  transition:all 0.25s ease;border:1px solid transparent;white-space:nowrap
}
.btn-primary{background:var(--color-primary);color:#0B1A2E;border-color:var(--color-primary)}
.btn-primary:hover{background:transparent;color:var(--color-primary);box-shadow:inset 0 0 0 1px var(--color-primary)}
.btn-accent{background:var(--color-accent);color:#0B1A2E;border-color:var(--color-accent)}
.btn-accent:hover{background:transparent;color:var(--color-accent);box-shadow:inset 0 0 0 1px var(--color-accent)}
.card{
  background:var(--color-card);border-radius:12px;padding:24px;
  border:1px solid var(--color-border);transition:border-color 0.3s
}
.card:hover{border-color:var(--color-primary)}
.glass-panel{
  background:var(--color-glass);backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);border-radius:12px;padding:24px;
  border:1px solid rgba(255,255,255,0.06)
}
.section-number{
  font-family:var(--font-display);font-size:4rem;font-weight:900;
  color:var(--color-primary);opacity:0.3;line-height:1;margin-bottom:-0.3em;
  letter-spacing:-0.03em;user-select:none
}

/* ===== BREADCRUMBS ===== */
.breadcrumb{display:flex;flex-wrap:wrap;gap:6px;font-size:0.85rem;color:var(--color-text-secondary);padding:12px 0}
.breadcrumb a{color:var(--color-text-secondary);transition:color 0.2s}
.breadcrumb a:hover{color:var(--color-primary)}
.breadcrumb-sep{color:var(--color-border);padding:0 4px}

/* ===== RESPONSIVE ===== */
@media(max-width:1024px){
  .footer-content{grid-template-columns:1fr 1fr;gap:24px}
  .page-container{padding:24px 28px 48px}
}
@media(max-width:768px){
  body{flex-direction:column}
  .site-header{
    position:fixed;top:0;left:0;width:100%;height:auto;flex-direction:row;
    flex-wrap:wrap;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
    border-right:none;border-bottom:1px solid var(--color-border);
    padding:0;z-index:1000;transform:translateX(0);transition:transform 0s
  }
  .site-header[data-open="true"],
  .site-header[data-open="false"]{width:100%}
  .brand-rail{width:100%;padding:14px 16px;border-bottom:none}
  .site-header[data-open="false"] .brand-name{display:inline}
  .site-header[data-open="false"] .brand-mark{font-size:2.2rem}
  .site-nav{
    position:fixed;top:0;left:0;width:280px;height:100vh;
    background:var(--color-card);backdrop-filter:blur(20px);
    -webkit-backdrop-filter:blur(20px);
    transform:translateX(-100%);transition:transform var(--transition-speed) ease;
    border-right:1px solid var(--color-border);padding-top:80px;z-index:999;
    box-shadow:4px 0 40px rgba(0,0,0,0.4)
  }
  .site-header[data-open="true"] .site-nav{transform:translateX(0)}
  .site-header[data-open="false"] .site-nav{transform:translateX(-100%)}
  .site-header[data-open="false"] .nav-label{display:inline}
  .site-header[data-open="false"] .nav-index{font-size:0.8rem}
  .nav-list{padding:0 16px;gap:4px}
  .nav-link{padding:14px 12px}
  .header-decor{display:none}
  .toggle-bar{background:var(--color-text)}
  .site-header[data-open="true"] .toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg);width:20px}
  .site-header[data-open="true"] .toggle-bar:nth-child(2){opacity:0}
  .site-header[data-open="true"] .toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg);width:20px}
  .site-header[data-open="false"] .toggle-bar:nth-child(1){transform:none;width:18px}
  .site-header[data-open="false"] .toggle-bar:nth-child(2){opacity:1}
  .site-header[data-open="false"] .toggle-bar:nth-child(3){transform:none;width:18px}
  #main-content{margin-left:0;padding-top:62px}
  .site-header[data-open="false"] ~ #main-content,
  .site-header[data-open="true"] ~ #main-content{margin-left:0}
  .page-container{padding:20px 18px 40px}
  .footer-content{grid-template-columns:1fr;gap:20px}
  .site-footer{padding:28px 18px 16px}
  .footer-contact{flex-direction:column;gap:2px}
  .contact-sep{display:none}
  .footer-trust{padding:12px 16px}
}
@media(min-width:769px){
  .site-header[data-open="false"] .nav-toggle .toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg);width:20px}
  .site-header[data-open="false"] .nav-toggle .toggle-bar:nth-child(2){opacity:0}
  .site-header[data-open="false"] .nav-toggle .toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg);width:20px}
  .site-header[data-open="true"] .nav-toggle .toggle-bar:nth-child(1){transform:none;width:18px}
  .site-header[data-open="true"] .nav-toggle .toggle-bar:nth-child(2){opacity:1}
  .site-header[data-open="true"] .nav-toggle .toggle-bar:nth-child(3){transform:none;width:18px}
}

/* ===== PREFERS REDUCED MOTION ===== */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:0.01ms!important;transition-duration:0.01ms!important;scroll-behavior:auto}
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar{width:4px;height:4px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:var(--color-text-secondary)}