/* ── Base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body { margin: 0; }

/* ── Navbar ─────────────────────────────────────────── */
#navbar {
    background: rgba(255, 255, 255, 0);
    transition: background 0.4s ease, box-shadow 0.4s ease, padding 0.4s ease;
}
#navbar.scrolled {
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
}

/* ── Buttons ────────────────────────────────────────── */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #1a5f5f;
    color: #fff;
    padding: 0.75rem 1.75rem;
    border-radius: 0.75rem;
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: background 0.25s ease, transform 0.2s ease, box-shadow 0.25s ease;
}
.btn-primary:hover {
    background: #154a4a;
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(26, 95, 95, 0.3);
}

/* ── Scroll Reveal ──────────────────────────────────── */
.reveal {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.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; }

/* ── Mobile Menu ────────────────────────────────────── */
#mobile-menu {
    box-shadow: none;
}
#mobile-menu.open {
    box-shadow: 0 0 60px rgba(0,0,0,0.1);
}

/* ── Image hover ─────────────────────────────────────── */
img {
    display: block;
    max-width: 100%;
}

/* ── Selection ───────────────────────────────────────── */
::selection {
    background: #1a5f5f;
    color: #fff;
}

/* ── Focus ───────────────────────────────────────────── */
:focus-visible {
    outline: 2px solid #3a7e7a;
    outline-offset: 2px;
}

/* ── Responsive tweaks ──────────────────────────────── */
@media (max-width: 640px) {
    .font-serif { line-height: 1.1; }
}