:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #13131a;
    --text-primary: #ffffff;
    --text-secondary: #9ca3af;
    --accent: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.5);
    --card-border: rgba(255, 255, 255, 0.08);
    --card-border-hover: rgba(255, 255, 255, 0.2);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
}

/* Dynamic Background Glows */
.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.5;
    animation: float 10s infinite alternate ease-in-out;
}

.orb-1 {
    top: -10%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, rgba(99,102,241,0.15) 0%, rgba(0,0,0,0) 70%);
}

.orb-2 {
    bottom: -20%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, rgba(139,92,246,0.1) 0%, rgba(0,0,0,0) 70%);
    animation-delay: -5s;
}

@keyframes float {
    0% { transform: translate(0, 0); }
    100% { transform: translate(30px, 30px); }
}

.container {
    width: 100%;
    max-width: 1000px;
    padding: 2rem;
    z-index: 1;
}

header {
    text-align: center;
    margin-bottom: 4rem;
    animation: fadeInDown 1s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 400;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

/* Premium Card Design */
.card {
    position: relative;
    display: block;
    text-decoration: none;
    color: inherit;
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 2px; /* For the gradient border */
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.card:nth-child(2) {
    animation-delay: 0.1s;
}

.card-content {
    position: relative;
    background: var(--bg-secondary);
    border-radius: 18px;
    padding: 2.5rem 2rem;
    height: 100%;
    z-index: 2;
    overflow: hidden;
    transition: background 0.3s ease;
}

.card-hover-border {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 20px;
    background: linear-gradient(135deg, var(--card-border) 0%, transparent 100%);
    z-index: 1;
    transition: opacity 0.3s ease;
}

.card:hover {
    transform: translateY(-5px) scale(1.02);
}

.card:hover .card-hover-border {
    background: linear-gradient(135deg, var(--accent) 0%, transparent 100%);
    opacity: 1;
}

.card:hover .card-content {
    background: linear-gradient(180deg, rgba(30,30,36,1) 0%, rgba(19,19,26,1) 100%);
}

.icon-wrapper {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--accent);
    transition: all 0.3s ease;
}

.card:hover .icon-wrapper {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 0 20px var(--accent-glow);
    border-color: transparent;
}

.card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.placeholder {
    opacity: 0.6;
    border: 1px dashed var(--card-border);
    background: transparent;
}

.placeholder .card-content {
    background: transparent;
}

.placeholder:hover {
    transform: none;
    cursor: default;
    opacity: 1;
}

.placeholder:hover .card-hover-border {
    background: transparent;
}

.placeholder:hover .icon-wrapper {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    box-shadow: none;
    border-color: var(--card-border);
}

/* Mouse tracking light effect via JS */
.card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 20px;
    background: radial-gradient(
        800px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
        rgba(255, 255, 255, 0.06),
        transparent 40%
    );
    z-index: 3;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

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

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 600px) {
    h1 {
        font-size: 2.2rem;
    }
    .grid {
        grid-template-columns: 1fr;
    }
}