/* Header & Nav */
header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-glass);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.25rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

nav {
    display: flex;
    gap: 4px;
    background: rgba(0, 0, 0, 0.2);
    padding: 4px;
    border-radius: 12px;
}

.nav-item {
    padding: 8px 16px;
    border-radius: 8px;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
    border: none;
    background: transparent;
}

.nav-item:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
}

.nav-item.active {
    background: var(--bg-card);
    color: var(--text-main);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* Main Content Area */
main {
    flex: 1;
    position: relative;
    overflow-y: auto;
    scroll-behavior: smooth;
    padding: 2rem;
}

.section-content {
    display: none;
    max-width: var(--container-width);
    margin: 0 auto;
    animation: fadeIn 0.4s ease forwards;
}

.section-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Cards & Glass Panels */
.card,
.glass-panel {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    width: 100%;
}

.card h3 {
    margin-bottom: 0.75rem;
    color: var(--secondary);
    font-size: 1.2rem;
}

/* Device Grid */
.device-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.device-card {
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    transition:
        transform 0.2s,
        box-shadow 0.2s;
}

.device-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
    border-color: rgba(96, 165, 250, 0.3);
}

.device-media {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 140px;
    margin-bottom: 1rem;
    padding: 0.75rem;
    border-radius: 12px;
    background: rgba(15, 23, 42, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.device-media img {
    width: 100%;
    height: 120px;
    object-fit: contain;
    filter: drop-shadow(0 10px 18px rgba(15, 23, 42, 0.35));
}

.device-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: auto;
    padding-top: 1rem;
}

.tag {
    font-size: 0.75rem;
    padding: 4px 8px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
}

.tag.feat {
    background: rgba(52, 211, 153, 0.2);
    color: #6ee7b7;
}

/* Filters */
.filter-bar {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
    padding: 1rem;
    background: var(--bg-glass);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-glass);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.filter-group label {
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

select {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-glass);
    color: var(--text-main);
    padding: 8px 12px;
    border-radius: 6px;
    outline: none;
    min-width: 140px;
}

select:focus {
    border-color: var(--primary);
}

/* FAQ / Accordion */
.faq-item {
    border-bottom: 1px solid var(--border-glass);
    padding: 1rem 0;
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    cursor: pointer;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    margin-top: 0.5rem;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Tables for Comparison */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-glass);
}

th {
    color: var(--primary);
    font-weight: 600;
}

/* Mobile Nav */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    header {
        padding: 0 1rem;
    }

    .mobile-menu-btn {
        display: block;
    }

    nav {
        display: none;
        /* Hidden by default on mobile, toggled via JS if we add it, or just use stacked layout */
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-body);
        padding: 1rem;
        z-index: 99;
        border-bottom: 1px solid var(--border-glass);
    }

    nav.open {
        display: flex;
    }
}