/* ---- reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
body { line-height: 1.6; -webkit-font-smoothing: antialiased; }
ul, ol { list-style: none; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
button { background: none; border: none; cursor: pointer; font: inherit; }
.visually-hidden:not(:focus):not(:active) { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; border: 0; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }

/* ---- variables ---- */
:root {
  --primary-gold: #D4AF37;
  --primary-red: #E74C3C;
  --secondary-black: #1A1A1A;
  --accent-white: #F5F5F5;
  --background-dark: #0D0D0D;
  --background-light: #FEFCF3;
  --text-primary: #1A1A1A;
  --text-on-dark: #F5F5F5;
  --link-hover: #FFD700;
  --border-gold: #C9A96E;

  --heading-font: 'Noto Serif SC','Songti SC',Georgia,serif;
  --body-font: 'Noto Sans SC','PingFang SC','Microsoft YaHei',-apple-system,sans-serif;

  --h1-size: clamp(2rem, 5vw, 2.5rem);
  --h2-size: clamp(1.5rem, 4vw, 1.75rem);
  --h3-size: clamp(1.125rem, 3vw, 1.25rem);
  --body-size: 1rem;
  --small-size: 0.875rem;

  --shadow-card: 0 4px 20px rgba(0,0,0,0.1);
  --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.2);
  --border-radius: 0.375rem;
  --transition-base: 0.2s ease;
}

/* ---- base typography ---- */
body { font-family: var(--body-font); font-size: var(--body-size); color: var(--text-primary); background: var(--accent-white); }
h1, h2, h3 { font-family: var(--heading-font); line-height: 1.2; color: var(--secondary-black); }
h1 { font-size: var(--h1-size); font-weight: 700; }
h2 { font-size: var(--h2-size); }
h3 { font-size: var(--h3-size); }
p, li { font-size: var(--body-size); }
.text-small { font-size: var(--small-size); color: #666; }

/* ---- container ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1rem; }

/* ---- section ---- */
.section { padding: 3rem 0; }
.section-dark { background: var(--background-dark); color: var(--text-on-dark); }
.section-light { background: var(--background-light); }
.section-pattern { background-image: radial-gradient(circle, rgba(212,175,55,0.08) 1px, transparent 1px); background-size: 20px 20px; }

/* ---- skip link ---- */
.skip-link { position: absolute; top: -100%; left: 50%; transform: translateX(-50%); background: var(--primary-gold); color: var(--secondary-black); padding: 0.75rem 1.5rem; z-index: 1000; border-radius: 0 0 var(--border-radius) var(--border-radius); }
.skip-link:focus { top: 0; }

/* ---- header ---- */
.site-header {
  background: var(--background-dark);
  border-bottom: 3px solid var(--border-gold);
  position: sticky; top: 0; z-index: 100;
}
.header-inner {
  display: flex; align-items: center; justify-content: center;
  position: relative; min-height: 70px;
}
.nav-wrapper { display: flex; align-items: center; width: 100%; justify-content: space-between; }
.nav-list { display: flex; gap: 0.5rem; }
.nav-item { white-space: nowrap; }
.nav-link {
  display: inline-block; padding: 0.5rem 1rem; color: var(--text-on-dark);
  font-family: var(--heading-font); font-size: 0.9rem; letter-spacing: 0.05em;
  border: 1px solid transparent; transition: var(--transition-base);
}
.nav-link:hover, .nav-link:focus-visible { color: var(--primary-gold); border-color: var(--primary-gold); border-radius: var(--border-radius); }
.nav-link[aria-current="page"] { color: var(--primary-gold); border-bottom: 2px solid var(--primary-gold); }
.logo { text-align: center; flex: 0 0 auto; margin: 0 1.5rem; }
.logo-link { display: flex; flex-direction: column; align-items: center; }
.logo-text { font-family: var(--heading-font); font-size: 1.8rem; color: var(--primary-gold); font-weight: 700; line-height: 1; }
.logo-tagline { font-size: 0.75rem; color: var(--accent-white); letter-spacing: 0.2em; margin-top: 2px; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 1px solid var(--border-gold); padding: 0.5rem; border-radius: var(--border-radius); }
.toggle-bar { width: 24px; height: 2px; background: var(--primary-gold); transition: var(--transition-base); }
.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }
.nav-toggle:hover, .nav-toggle:focus-visible { border-color: var(--primary-gold); }

/* ---- footer ---- */
.site-footer {
  background: var(--background-dark); color: var(--text-on-dark);
  border-top: 3px solid var(--border-gold); padding: 2rem 0;
  font-size: var(--small-size);
}
.footer-inner { display: flex; flex-wrap: wrap; gap: 2rem; justify-content: space-between; align-items: flex-start; }
.footer-brand { min-width: 180px; }
.footer-logo { font-family: var(--heading-font); font-size: 1.5rem; color: var(--primary-gold); font-weight: 700; }
.footer-tagline { font-size: 0.8rem; color: #aaa; letter-spacing: 0.1em; }
.footer-links ul { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-links a { color: var(--accent-white); transition: var(--transition-base); }
.footer-links a:hover, .footer-links a:focus-visible { color: var(--primary-gold); }
.footer-contact p { margin-bottom: 0.25rem; }
.footer-contact a { color: var(--primary-gold); }
.footer-contact a:hover { color: var(--link-hover); }
.footer-icp { width: 100%; text-align: center; border-top: 1px solid var(--border-gold); padding-top: 1rem; margin-top: 1rem; }
.icp-text { color: #888; }

/* ---- buttons ---- */
.btn { display: inline-block; padding: 0.75rem 2rem; font-family: var(--body-font); font-size: 1rem; font-weight: 500; border: 2px solid var(--primary-gold); border-radius: var(--border-radius); transition: var(--transition-base); cursor: pointer; }
.btn-primary { background: var(--primary-gold); color: var(--secondary-black); }
.btn-primary:hover, .btn-primary:focus-visible { background: transparent; color: var(--primary-gold); }
.btn-outline { background: transparent; color: var(--primary-gold); }
.btn-outline:hover, .btn-outline:focus-visible { background: var(--primary-gold); color: var(--secondary-black); }
.btn:focus-visible { outline: 2px solid var(--primary-red); outline-offset: 2px; }

/* ---- breadcrumb ---- */
.breadcrumb { padding: 1rem 0; }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 0.25rem 0.5rem; }
.breadcrumb li::after { content: '/'; margin-left: 0.25rem; color: #999; }
.breadcrumb li:last-child::after { content: none; }
.breadcrumb a { color: var(--primary-gold); }
.breadcrumb a:hover { color: var(--link-hover); }
.breadcrumb .current { color: var(--text-primary); }

/* ---- card ---- */
.card { background: var(--accent-white); border: 2px solid var(--border-gold); border-radius: var(--border-radius); padding: 1.5rem; box-shadow: var(--shadow-card); transition: var(--transition-base); }
.card:hover, .card:focus-within { box-shadow: var(--shadow-card-hover); border-color: var(--primary-gold); transform: translateY(-2px); }
.card img { border-radius: var(--border-radius); margin-bottom: 1rem; }

/* ---- grid ---- */
.grid { display: flex; flex-wrap: wrap; gap: 1.5rem; }
.grid-item { flex: 1 1 100%; min-width: 0; }
@media (min-width: 640px) { .grid-2 .grid-item { flex: 1 1 calc(50% - 0.75rem); } }
@media (min-width: 768px) { .grid-3 .grid-item { flex: 1 1 calc(33.333% - 1rem); } }
@media (min-width: 1024px) { .grid-4 .grid-item { flex: 1 1 calc(25% - 1.125rem); } }

/* ---- reveal animation (respect prefers-reduced-motion) ---- */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
  .reveal.revealed { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}

/* ---- focus visible ---- */
:focus-visible { outline: 2px solid var(--primary-gold); outline-offset: 2px; }

/* ---- responsive header ---- */
@media (max-width: 767px) {
  .nav-wrapper { display: none; position: absolute; top: 100%; left: 0; width: 100%; background: var(--background-dark); border-top: 2px solid var(--border-gold); padding: 1rem; flex-direction: column; gap: 0; }
  .nav-wrapper[data-open="true"] { display: flex; }
  .nav-list { flex-direction: column; width: 100%; }
  .nav-left, .nav-right { width: 100%; }
  .nav-item { text-align: center; }
  .nav-link { padding: 0.75rem 1rem; width: 100%; }
  .logo { margin: 0; }
  .logo-text { font-size: 1.5rem; }
  .logo-tagline { font-size: 0.65rem; }
  .nav-toggle { display: flex; position: absolute; right: 1rem; top: 50%; transform: translateY(-50%); }
}
@media (min-width: 768px) {
  .nav-toggle { display: none; }
}

/* ---- responsive footer ---- */
@media (max-width: 599px) {
  .footer-inner { flex-direction: column; text-align: center; }
  .footer-links ul { align-items: center; }
}