/*
 * modern.css — Aegis Cloud complementary styles
 *
 * ── JS REQUIRED (add before </body> in every HTML page) ──────────────────────
 *
 * <script>
 * // Dark mode
 * const root = document.documentElement;
 * const saved = localStorage.getItem('theme');
 * if (saved) root.setAttribute('data-theme', saved);
 *
 * document.getElementById('theme-toggle')?.addEventListener('click', () => {
 *   const next = root.getAttribute('data-theme') === 'dark' ? 'light' : 'dark';
 *   root.setAttribute('data-theme', next);
 *   localStorage.setItem('theme', next);
 * });
 *
 * // Hamburger menu
 * document.getElementById('nav-toggle')?.addEventListener('click', () => {
 *   document.getElementById('nav-menu').classList.toggle('open');
 * });
 *
 * // Fade-in on scroll
 * const observer = new IntersectionObserver(
 *   entries => entries.forEach(e => { if (e.isIntersecting) e.target.classList.add('visible'); }),
 *   { threshold: 0.1 }
 * );
 * document.querySelectorAll('.fade-in').forEach(el => observer.observe(el));
 * </script>
 *
 * ── HTML SNIPPETS ─────────────────────────────────────────────────────────────
 *
 * Dark mode button (inside .header-content):
 * <button id="theme-toggle" class="theme-toggle" aria-label="Toggle dark mode">☀️</button>
 *
 * Hamburger button (inside .header-content, before <nav>):
 * <button id="nav-toggle" class="nav-toggle" aria-label="Menu">
 *   <span></span><span></span><span></span>
 * </button>
 *
 * Nav wrapper (wrap existing <nav> links):
 * <nav id="nav-menu">...</nav>
 * ─────────────────────────────────────────────────────────────────────────────
 */

/* ── Dark mode toggle button ── */
.theme-toggle {
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 20px;
    padding: 4px 10px;
    cursor: pointer;
    font-size: 1rem;
    color: #fff;
    margin-left: 20px;
    transition: border-color 0.25s ease, background 0.25s ease;
    line-height: 1;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-accent);
}

/* ── Hamburger button ── */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: #ffffff;
    border-radius: 2px;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

/* ── Fade-in animation ── */
.fade-in {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.45s ease, transform 0.45s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ── Cards ── */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px;
    transition: box-shadow 0.25s ease, transform 0.25s ease, background 0.25s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

/* ── Mobile ── */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .site-header nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--color-primary);
        padding: 16px 20px 20px;
        flex-direction: column;
        gap: 4px;
        box-shadow: var(--shadow-md);
    }

    .site-header nav.open {
        display: flex;
    }

    .site-header nav a {
        margin-left: 0;
        padding: 10px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        font-size: 1rem;
    }

    .site-header nav a:last-child {
        border-bottom: none;
    }

    .site-header .header-content {
        position: relative;
    }

    .content {
        padding: 32px 16px;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }

    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.4rem; }
}

@media (max-width: 480px) {
    .button {
        width: 100%;
        text-align: center;
    }
}