/* Container */
.container { width: 100%; max-width: var(--max-w); margin-inline: auto; padding-inline: var(--space-lg); }

/* Navigation */
.nav {
  position: sticky; top: 0; z-index: 200;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  height: var(--nav-h);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%;
}
.nav-logo { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.nav-logo-icon {
  width: 80px; height: 80px; background: transparent;
  border-radius: var(--radius); display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.nav-logo-text { line-height: 1.2; }
.nav-logo-text .brand { font-size: 32px; font-weight: 700; color: var(--primary); font-family: "Ma Shan Zheng", "华文行楷", "STXingkai", "KaiTi", serif; }
.nav-logo-text .sub { display: none; }

.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-menu a {
  padding: 8px 14px; border-radius: var(--radius-sm); font-size: 14px; font-weight: 500;
  color: var(--text-secondary); transition: all .15s;
}
.nav-menu a:hover, .nav-menu a.active { color: var(--primary); background: var(--primary-light); }
.nav-cta { background: var(--primary); color: #fff !important; border-radius: var(--radius) !important; }
.nav-cta:hover { background: var(--primary-dark) !important; color: #fff !important; }

.nav-hamburger {
  display: none; flex-direction: column; gap: 5px; padding: 8px;
  border-radius: var(--radius-sm);
}
.nav-hamburger span { display: block; width: 22px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: all .25s; }

/* Mobile menu */
.nav-mobile {
  display: none; position: fixed; top: var(--nav-h); left: 0; right: 0;
  background: var(--surface); border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow); z-index: 199; padding: 12px 16px 16px;
}
.nav-mobile.open { display: block; }
.nav-mobile a {
  display: block; padding: 12px 16px; border-radius: var(--radius-sm);
  font-size: 15px; color: var(--text-secondary); font-weight: 500;
  border-bottom: 1px solid var(--border);
}
.nav-mobile a:last-child { border-bottom: none; }
.nav-mobile a:hover { color: var(--primary); background: var(--primary-light); }

/* Page Hero */
.page-hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--accent) 100%);
  color: var(--text-inverse); padding: var(--space-xl) 0;
}
.page-hero h1 { font-size: var(--font-size-2xl); font-weight: 700; margin-bottom: 8px; }
.page-hero p { font-size: var(--font-size-lg); opacity: .85; }

/* Section */
.section { padding: var(--space-3xl) 0; }
.section-alt { background: var(--surface); }
.section-title { font-size: var(--font-size-2xl); font-weight: 700; text-align: center; margin-bottom: 12px; color: var(--text-primary); }
.section-subtitle { font-size: var(--font-size-base); color: var(--text-muted); text-align: center; margin-bottom: var(--space-2xl); max-width: 600px; margin-inline: auto; }
.section-header-line {
  width: 48px; height: 3px; background: var(--primary); border-radius: 2px;
  margin: 12px auto var(--space-2xl);
}

/* Grid layouts */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-lg); }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--space-lg); }
.grid-auto-sm { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: var(--space-md); }

/* Breadcrumb */
.breadcrumb { padding: 14px 0; font-size: var(--font-size-sm); color: var(--text-muted); display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: var(--border-dark); }

/* Footer */
.footer {
  background: #1a2332; color: #c9d1d9; padding: var(--space-2xl) 0 var(--space-lg);
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--space-xl); margin-bottom: var(--space-xl); }
.footer-brand .brand-name { font-size: 18px; font-weight: 700; color: #fff; margin-bottom: 10px; }
.footer-brand .brand-desc { font-size: 13px; line-height: 1.7; color: #8b949e; }
.footer h4 { font-size: 14px; font-weight: 600; color: #fff; margin-bottom: 14px; }
.footer ul { display: flex; flex-direction: column; gap: 8px; }
.footer ul a { font-size: 13px; color: #8b949e; transition: color .15s; }
.footer ul a:hover { color: var(--primary-mid); }
.footer-contact p { font-size: 13px; color: #8b949e; margin-bottom: 8px; display: flex; align-items: flex-start; gap: 8px; }
.footer-contact p svg { width: 14px; height: 14px; flex-shrink: 0; margin-top: 2px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.08); padding-top: var(--space-lg); display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer-bottom p { font-size: 12px; color: #6b7280; }

/* Pagination */
.pagination { display: flex; align-items: center; justify-content: center; gap: 8px; padding: var(--space-xl) 0; flex-wrap: wrap; }
.pagination button {
  padding: 8px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface); font-size: 14px; transition: all .15s;
}
.pagination button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination button:hover:not(.active):not(:disabled) { background: var(--primary-light); border-color: var(--primary); color: var(--primary); }
.pagination button:disabled { opacity: .4; cursor: default; }

/* Loading / Empty states */
.loading { text-align: center; padding: var(--space-2xl); color: var(--text-muted); }
.loading .spinner { width: 32px; height: 32px; border: 3px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin .7s linear infinite; margin: 0 auto 12px; }
@keyframes spin { to { transform: rotate(360deg); } }
.empty-state { text-align: center; padding: var(--space-2xl); color: var(--text-muted); }
.empty-state h3 { font-size: 18px; margin-bottom: 8px; }