/* ========== BASE & RESET ========== */
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; scroll-padding-top: 80px; }
  body { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
  img { max-width: 100%; height: auto; display: block; }
  a { text-decoration: none; }
  button { cursor: pointer; border: none; background: none; font-family: inherit; }
  input, textarea, select { font-family: inherit; }

  /* ========== NAV ========== */
  #site-header {
    transition: background 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease;
  }
  #site-header.scrolled {
    background: rgba(2, 6, 23, 0.85);
    backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(255,255,255,0.05);
  }
  .nav-link {
    position: relative;
  }
  .nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: #2dd4bf;
    transition: width 0.3s ease;
  }
  .nav-link:hover::after { width: 100%; }

  /* ========== MOBILE MENU ========== */
  #mobile-menu.open {
    opacity: 1;
    pointer-events: all;
  }

  /* ========== HERO ========== */
  .hero-bg {
    will-change: transform;
  }
  @supports (height: 100dvh) {
    #hero { min-height: 100dvh; }
  }

  /* ========== ROOM CARDS ========== */
  .room-card {
    transform: translateY(0);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
  }
  .room-card:hover {
    transform: translateY(-6px);
  }

  /* ========== SCROLL ANIMATIONS ========== */
  .reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  }
  .reveal.visible {
    opacity: 1;
    transform: translateY(0);
  }
  .reveal-delay-1 { transition-delay: 0.1s; }
  .reveal-delay-2 { transition-delay: 0.2s; }
  .reveal-delay-3 { transition-delay: 0.3s; }
  .reveal-delay-4 { transition-delay: 0.4s; }

  /* ========== GEOMETRIC DECORATIONS ========== */
  .geo-diamond {
    position: absolute;
    width: 20px;
    height: 20px;
    background: #2dd4bf;
    opacity: 0.3;
    transform: rotate(45deg);
  }

  /* ========== FORM ========== */
  input:focus, textarea:focus {
    outline: none;
  }

  /* ========== CUSTOM SCROLLBAR ========== */
  ::-webkit-scrollbar { width: 8px; }
  ::-webkit-scrollbar-track { background: #0f172a; }
  ::-webkit-scrollbar-thumb { background: #0d9488; border-radius: 4px; }
  ::-webkit-scrollbar-thumb:hover { background: #14b8a6; }

  /* ========== RESPONSIVE ========== */
  @media (max-width: 768px) {
    .font-display { font-size: clamp(2rem, 8vw, 3rem); }
  }

  /* ========== FOCUS VISIBLE ========== */
  :focus-visible {
    outline: 2px solid #2dd4bf;
    outline-offset: 2px;
  }

  /* ========== SELECTION ========== */
  ::selection {
    background: rgba(13, 148, 136, 0.3);
    color: #0f172a;
  }