/* ===== layout.css ===== */

/* Header */
.site-header{
    position: sticky; top: 0; z-index: 50;
    background: rgba(255,255,255,.72);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line);
  }
  .site-header.is-scrolled{ box-shadow: var(--shadow); }
  
  .header__bar{
    display:flex; align-items:center; justify-content:space-between;
    height: 64px;
  }
  .brand{ display:flex; align-items:center; gap:10px; font-weight:700; }
  .brand__logo{ width: 2.5rem; height: 2.5rem; }
  .brand__text{ font-size: 16px; }
  
  .nav--desktop{ display:flex; gap:18px; align-items:center; }
  .nav__link{ color: var(--text-2); font-size: 14px; }
  .nav__link.is-active{ color: var(--text); font-weight:600; }
  .header__cta{ display:flex; gap:10px; align-items:center; }
  
  /* Hamburger（移动端） */
  .hamburger{ display:none; background:none; border:0; }
  .hamburger__bar{ display:block; width:22px; height:2px; background:#111; margin:4px 0; border-radius:4px; }
  
  @media (max-width: 960px){
    .nav--desktop,.header__cta{ display:none; }
    .hamburger{ display:block; }
  }
  
  /* Mobile Drawer */
  .mobile-nav{
    position: fixed; inset:0; z-index: 60;
  }
  .mobile-nav__panel{
    position:absolute; right:0; top:0; height:100%; width:min(86vw, 360px);
    background:#fff; border-left:1px solid var(--line);
    padding: 18px;
    display:flex; flex-direction:column; gap:12px;
    box-shadow: var(--shadow);
  }
  .mobile-nav__link{ padding:10px 8px; border-radius:10px; color: var(--text-2); }
  .mobile-nav__link:hover{ background:#f3f4f6; color: var(--text); }
  .mobile-nav__cta{ margin-top:auto; display:grid; gap:8px; }
  
  .mobile-nav__backdrop{
    position:absolute; inset:0; background: rgba(15,23,42,.28);
  }
  
  /* Grid */
  .grid{ display:grid; gap:18px; }
  .grid--2{ grid-template-columns: repeat(2, minmax(0,1fr)); }
  .grid--3{ grid-template-columns: repeat(3, minmax(0,1fr)); }
  @media (max-width: 960px){
    .grid--2, .grid--3{ grid-template-columns: 1fr; }
  }
  
  /* Hero */
  .hero__badge{
    display:inline-block; font-size:12px; color:var(--muted);
    border:1px solid var(--line); border-radius:999px; padding:6px 10px; margin-bottom:10px;
  }
  .hero__title{ font-size: var(--h1); font-weight: 800; line-height:1.15; }
  .hero__subtitle{ color: var(--text-2); font-size: 18px; margin-top:12px; }
  .hero__cta{ display:flex; gap:10px; margin-top:18px; }
  
  /* Footer */
  .site-footer{ background:#0b1220; color:#d0d6e1; margin-top: 40px; }
  .footer__grid{ display:grid; gap:20px; grid-template-columns: repeat(4, minmax(0,1fr)); padding: 40px 0; }
  .footer__title{ color:#fff; font-size:14px; margin-bottom:10px; }
  .footer__tagline{ color:#cbd5e1; margin-top:8px; }
  .footer__bar{ border-top:1px solid rgba(255,255,255,.08); }
  .footer__bar-inner{ display:flex; justify-content:space-between; align-items:center; padding: 14px 0; font-size:12px; color:#94a3b8; }
  .brand--footer .brand__logo{ filter: invert(1) brightness(1.4); }
  .social{ display:flex; gap:10px; margin-top:10px; }
  .social__link{ color:#cbd5e1; font-size:14px; }
  .qr{ margin-top:10px; }
  .qr__img{ width:120px; height:auto; border-radius:10px; border:1px solid rgba(255,255,255,.12); }
  .qr__caption{ font-size:12px; color:#94a3b8; margin-top:6px; }
  
  @media (max-width: 960px){
    .footer__grid{ grid-template-columns: 1fr; }
    .footer__bar-inner{ flex-direction:column; gap:8px; }
  }
  
  /* 表单 */
  .form-grid{ display:grid; gap:12px; grid-template-columns: repeat(2, minmax(0,1fr)); }
  .form-field{ display:flex; flex-direction:column; gap:6px; }
  .form-field--full{ grid-column: 1/-1; }
  .form-field input, .form-field textarea{
    border:1px solid var(--line); border-radius:12px; padding:10px 12px; background:#fff; color:var(--text);
  }
  .form-field input:focus, .form-field textarea:focus{ outline:2px solid #e1e7ff; border-color:#c7d2fe; }
  .form-tip{ color: var(--muted); font-size: 13px; margin-top: 8px; }