:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --card-hover: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #38bdf8;
    --font-main: 'Outfit', sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 1200px;
    text-align: center;
}

header {
    margin-bottom: 60px;
    animation: fadeInDown 0.8s ease-out;
}

header h1 {
    font-size: 3rem;
    font-weight: 600;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-secondary);
    font-size: 1.2rem;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    padding: 0 20px;
}

.card {
    background-color: var(--card-bg);
    border-radius: 20px;
    padding: 40px 30px;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.8s ease-out backwards;
}

/* Stagger animation for cards */
.card:nth-child(1) {
    animation-delay: 0.1s;
}

.card:nth-child(2) {
    animation-delay: 0.2s;
}

.card:nth-child(3) {
    animation-delay: 0.3s;
}

.card:nth-child(4) {
    animation-delay: 0.4s;
}

.card:nth-child(5) {
    animation-delay: 0.5s;
}

.card:nth-child(6) {
    animation-delay: 0.6s;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.1) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    z-index: 0;
}

.card>* {
    position: relative;
    z-index: 1;
}

.card:hover {
    transform: translateY(-5px);
    background-color: var(--card-hover);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    border-color: rgba(56, 189, 248, 0.3);
}

.card:hover::before {
    opacity: 1;
}


.card-logo {
    width: auto;
    height: 120px;
    display: block;
    object-fit: contain;
    margin-bottom: 15px;
    transition: transform 0.3s ease;
}

.card:hover .card-logo {
    transform: scale(1.1);
}

.icon {
    font-size: 4rem;
    margin-bottom: 15px;
    transition: transform 0.3s ease;
}

.card:hover .icon {
    transform: scale(1.1);
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.card p {
    color: var(--text-secondary);
    font-size: 1rem;
}

footer {
    margin-top: 60px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    opacity: 0.6;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

/* Dropdown Card Styles */
.card.dropdown {
    cursor: default;
    padding: 0;
    justify-content: flex-start;
    overflow: visible;
}

.card-content {
    padding: 40px 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    transition: all 0.3s ease;
    cursor: pointer;
}

.device-list {
    max-height: 0;
    overflow: hidden;
    width: 100%;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(0, 0, 0, 0.2);
    position: relative;
    z-index: 10;
}

.card.dropdown:hover .device-list,
.card.dropdown:focus-within .device-list {
    max-height: 500px;
}

.device-link {
    display: block;
    padding: 15px 20px;
    color: var(--text-secondary);
    text-decoration: none;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.2s ease;
    text-align: left;
    font-size: 0.95rem;
    cursor: pointer;
    position: relative;
    z-index: 20;
}

.device-link:hover {
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent);
    padding-left: 25px;
}

.device-link span {
    margin-right: 10px;
}

/* Unavailable State Styles */
.card.unavailable {
    border-color: rgba(239, 68, 68, 0.8) !important;
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.3);
    background-color: rgba(239, 68, 68, 0.1);
}

.card.unavailable::before {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.2) 0%, transparent 100%);
    opacity: 1;
}

.card.unavailable:hover {
    border-color: #ef4444 !important;
    box-shadow: 0 0 30px rgba(239, 68, 68, 0.4);
    background-color: rgba(239, 68, 68, 0.15);
}

.card.unavailable .icon,
.card.unavailable h2,
.card.unavailable p {
    opacity: 0.8;
}

.card.unavailable::after {
    content: '⚠️';
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 1.5rem;
    color: #ef4444;
    z-index: 100;
}