/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:auto;-webkit-text-size-adjust:100%}
body{
  display:grid;
  grid-template-columns:280px 1fr;
  grid-template-rows:1fr auto;
  min-height:100vh;
  font-family:'Noto Sans SC','PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
  font-weight:400;
  line-height:1.6;
  color:var(--text-primary);
  background:var(--bg-light);
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{cursor:pointer;font:inherit;border:none;background:none}
:focus-visible{outline:2px solid var(--gold);outline-offset:2px}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:0.01ms!important;animation-iteration-count:1!important;transition-duration:0.01ms!important}}

/* ===== CSS Variables ===== */
:root{
  --gold:#D4AF37;
  --gold-light:#F0E68C;
  --gold-dark:#B8960F;
  --red:#C41E3A;
  --red-dark:#8B0000;
  --red-light:#D94A5E;
  --dark:#1A1A1A;
  --mid-dark:#2C2C2C;
  --mid-gray:#5A5A5A;
  --light-gray:#E5E5E5;
  --white:#FFFFFF;
  --bg-light:#F8F8F8;
  --bg-dark:#1A1A1A;
  --text-primary:#1A1A1A;
  --text-on-dark:#F8F8F8;
  --nav-width:280px;
  --gold-line:1px solid var(--gold);
  --red-line:2px solid var(--red);
  --transition:0.2s ease;
  --font-heading:'Noto Serif SC','Source Han Serif SC','SimSun',serif;
  --font-mono:'JetBrains Mono','Fira Code','Consolas',monospace;
}

/* ===== Skip Link ===== */
.skip-link{
  position:fixed;
  top:0;left:0;
  z-index:1000;
  padding:8px 16px;
  background:var(--gold);
  color:var(--dark);
  font-weight:700;
  font-size:0.875rem;
  transform:translateY(-100%);
  transition:transform var(--transition);
}
.skip-link:focus{transform:translateY(0)}

/* ===== Site Header – Sidebar ===== */
.site-header{
  grid-column:1;
  grid-row:1/-1;
  position:sticky;
  top:0;
  height:100vh;
  background:var(--bg-dark);
  color:var(--text-on-dark);
  display:flex;
  flex-direction:column;
  border-right:1px solid rgba(212,175,55,0.15);
  z-index:100;
  overflow-y:auto;
}
.header-inner{
  display:flex;
  flex-direction:column;
  height:100%;
  padding:32px 20px;
  position:relative;
}
.header-inner::before{
  content:'';
  position:absolute;
  top:0;left:20px;right:20px;
  height:1px;
  background:linear-gradient(90deg,transparent,var(--gold),transparent);
  opacity:0.4;
}

/* ===== Brand in Header ===== */
.header-brand{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  margin-bottom:48px;
  padding-bottom:24px;
  border-bottom:var(--gold-line);
  gap:4px;
}
.brand-mark{
  font-size:2rem;
  font-family:var(--font-heading);
  color:var(--gold);
  line-height:1;
  letter-spacing:0.1em;
}
.brand-text{
  font-size:1.25rem;
  font-family:var(--font-heading);
  font-weight:700;
  color:var(--white);
  letter-spacing:0.08em;
}

/* ===== Navigation Toggle (mobile) ===== */
.nav-toggle{
  display:none;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  width:44px;height:44px;
  gap:5px;
  background:transparent;
  border:1px solid var(--gold);
  border-radius:0;
  transition:border-color var(--transition);
}
.nav-toggle:hover{border-color:var(--gold-light)}
.toggle-bar{
  display:block;
  width:22px;height:2px;
  background:var(--gold);
  transition:transform var(--transition),opacity var(--transition);
  border-radius:0;
}
.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== Navigation Drawer ===== */
.nav-drawer{
  flex:1;
  display:flex;
  flex-direction:column;
}
.nav-list{
  display:flex;
  flex-direction:column;
  gap:4px;
  margin-bottom:32px;
  flex:1;
}
.nav-link{
  display:block;
  padding:10px 16px 10px 20px;
  font-size:0.95rem;
  font-weight:400;
  color:rgba(248,248,248,0.8);
  letter-spacing:0.04em;
  border-left:2px solid transparent;
  transition:color var(--transition),border-color var(--transition),background var(--transition);
  position:relative;
}
.nav-link::before{
  content:'';
  position:absolute;
  left:0;top:50%;
  width:0;height:0;
  border-radius:50%;
  background:var(--gold);
  transform:translateY(-50%);
  transition:width 0.3s ease,height 0.3s ease;
}
.nav-link:hover{
  color:var(--gold);
  border-left-color:var(--gold);
  background:rgba(212,175,55,0.06);
}
.nav-link:hover::before{width:6px;height:6px;left:-4px}
.nav-link[aria-current="page"]{
  color:var(--gold);
  border-left-color:var(--gold);
  font-weight:600;
  background:rgba(212,175,55,0.08);
}
.nav-link[aria-current="page"]::before{
  width:8px;height:8px;left:-5px;
  background:var(--gold);
  box-shadow:0 0 8px rgba(212,175,55,0.4);
}

/* ===== CTA Button in Nav ===== */
.nav-cta{
  display:block;
  text-align:center;
  padding:14px 20px;
  background:var(--red);
  color:var(--white);
  font-weight:700;
  font-size:0.95rem;
  letter-spacing:0.06em;
  transition:background var(--transition),box-shadow var(--transition);
  border:1px solid var(--red);
}
.nav-cta:hover{
  background:var(--red-dark);
  box-shadow:0 2px 16px rgba(196,30,58,0.3);
}

/* ===== Site Footer ===== */
.site-footer{
  grid-column:2;
  grid-row:2/3;
  background:var(--mid-dark);
  color:rgba(248,248,248,0.85);
  border-top:1px solid rgba(212,175,55,0.2);
}
.footer-inner{
  max-width:1200px;
  margin:0 auto;
  padding:48px 40px 32px;
  display:grid;
  grid-template-columns:1fr 1fr 1fr;
  gap:40px;
}
.footer-section{}
.footer-brand{
  font-size:1.5rem;
  font-family:var(--font-heading);
  font-weight:700;
  color:var(--gold);
  letter-spacing:0.08em;
  display:inline-block;
  margin-bottom:8px;
}
.footer-tagline{
  font-size:0.875rem;
  color:rgba(248,248,248,0.6);
  margin-top:4px;
}
.footer-heading{
  font-family:var(--font-heading);
  font-size:0.9rem;
  font-weight:700;
  color:var(--gold);
  letter-spacing:0.06em;
  margin-bottom:16px;
  padding-bottom:8px;
  border-bottom:1px solid rgba(212,175,55,0.2);
}
.footer-contact li,
.footer-legal li{
  font-size:0.875rem;
  line-height:1.8;
  color:rgba(248,248,248,0.75);
}
.contact-label{color:var(--gold-light);font-weight:600}
.footer-legal a{
  color:rgba(248,248,248,0.75);
  transition:color var(--transition);
  padding:2px 0;
  border-bottom:1px solid transparent;
}
.footer-legal a:hover{color:var(--gold);border-bottom-color:var(--gold)}
.footer-bottom{
  grid-column:1/-1;
  margin-top:24px;
  padding-top:24px;
  border-top:1px solid rgba(212,175,55,0.15);
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  font-size:0.8rem;
  color:rgba(248,248,248,0.5);
}
.footer-icp{font-family:var(--font-mono);letter-spacing:0.04em;color:rgba(248,248,248,0.4)}
.footer-note{color:rgba(248,248,248,0.4)}
.footer-copy{color:rgba(248,248,248,0.4)}

/* ===== Scroll Progress ===== */
.scroll-progress{
  position:fixed;
  top:0;left:280px;right:0;
  height:3px;
  z-index:99;
  background:rgba(212,175,55,0.15);
  pointer-events:none;
}
.scroll-progress-bar{
  height:100%;
  width:0%;
  background:linear-gradient(90deg,var(--gold),var(--gold-light));
  transition:width 0.1s linear;
}
@media(prefers-reduced-motion:reduce){.scroll-progress-bar{transition:none}}

/* ===== Common Components ===== */
.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:1200px;
  margin:0 auto;
  padding:0 40px;
}
.btn-primary{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:12px 32px;
  background:var(--red);
  color:var(--white);
  font-weight:700;
  font-size:0.95rem;
  letter-spacing:0.06em;
  border:1px solid var(--red);
  transition:background var(--transition),box-shadow var(--transition);
}
.btn-primary:hover{
  background:var(--red-dark);
  box-shadow:0 2px 20px rgba(196,30,58,0.25);
}
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  padding:16px 0;
  font-size:0.85rem;
  color:var(--mid-gray);
  font-family:var(--font-mono);
}
.breadcrumb a{color:var(--mid-gray);transition:color var(--transition)}
.breadcrumb a:hover{color:var(--gold)}
.breadcrumb span{color:var(--mid-gray)}
.breadcrumb .current{color:var(--dark);font-weight:600}

/* ===== Grid Helpers ===== */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.grid-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}

/* ===== Image Placeholder Base ===== */
.img-placeholder{
  background:var(--light-gray);
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:200px;
  color:var(--mid-gray);
  font-size:0.85rem;
  font-family:var(--font-mono);
  border:1px solid var(--light-gray);
  position:relative;
  overflow:hidden;
}
.img-placeholder::after{
  content:'📷';
  font-size:2rem;
  opacity:0.3;
}

/* ===== Responsive: Tablet & Mobile ===== */
@media(max-width:1024px){
  body{grid-template-columns:240px 1fr}
  :root{--nav-width:240px}
  .header-inner{padding:24px 16px}
  .brand-mark{font-size:1.6rem}
  .brand-text{font-size:1.1rem}
  .nav-link{font-size:0.875rem;padding:8px 12px 8px 16px}
  .scroll-progress{left:240px}
  .footer-inner{padding:40px 24px 24px;gap:32px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
}

@media(max-width:768px){
  body{
    grid-template-columns:1fr;
    grid-template-rows:auto 1fr auto;
  }
  .site-header{
    grid-column:1;
    grid-row:1/2;
    position:sticky;
    top:0;
    height:auto;
    min-height:0;
    border-right:none;
    border-bottom:1px solid rgba(212,175,55,0.2);
  }
  .header-inner{
    flex-direction:row;
    align-items:center;
    padding:12px 16px;
    height:auto;
    gap:12px;
  }
  .header-inner::before{display:none}
  .header-brand{
    flex-direction:row;
    align-items:center;
    margin-bottom:0;
    padding-bottom:0;
    border-bottom:none;
    gap:8px;
    flex:1;
  }
  .brand-mark{font-size:1.3rem}
  .brand-text{font-size:1rem}
  .nav-toggle{display:flex}
  .nav-drawer{
    position:fixed;
    top:0;left:0;
    width:300px;
    height:100vh;
    background:var(--bg-dark);
    padding:80px 24px 32px;
    flex-direction:column;
    transform:translateX(-100%);
    transition:transform 0.35s ease,box-shadow 0.35s ease;
    z-index:90;
    overflow-y:auto;
    box-shadow:none;
  }
  .nav-drawer[data-open]{
    transform:translateX(0);
    box-shadow:4px 0 40px rgba(0,0,0,0.5);
  }
  .nav-list{margin-bottom:24px}
  .nav-link{font-size:1rem;padding:12px 16px 12px 20px}
  .nav-link::before{display:none}
  .scroll-progress{left:0}
  
  /* Footer mobile */
  .site-footer{
    grid-column:1;
    grid-row:3/4;
  }
  .footer-inner{
    grid-template-columns:1fr;
    gap:32px;
    padding:32px 20px 24px;
  }
  .footer-bottom{
    flex-direction:column;
    align-items:flex-start;
    text-align:left;
    gap:8px;
  }
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .container{padding:0 20px}
}

@media(max-width:480px){
  .nav-drawer{width:100%}
  .footer-inner{padding:24px 16px 20px}
}