:root {
    /* Paleta de colores inspirada en una versión moderna y oscura de la UI de Windows */
    --bg-color: #0b1c2c;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: #a0b2c6;
    --accent-color: #0078d7; /* Azul clásico de Windows */
    --accent-hover: #1084ea;
    --success-color: #4ade80;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Inter', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(circle at 80% 0%, #11304d 0%, transparent 40%),
        radial-gradient(circle at 20% 100%, #05101a 0%, transparent 40%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    overflow-x: hidden;
}

.container {
    max-width: 900px;
    width: 100%;
    /* Glassmorphism effect */
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    background: rgba(11, 28, 44, 0.6);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 3rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), 
                inset 0 1px 0 rgba(255, 255, 255, 0.1);
    animation: slideUpFade 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Header & Logo */
.header {
    text-align: center;
    margin-bottom: 3rem;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

/* Logo animado puro CSS (evita usar imágenes innecesarias para mayor rendimiento) */
.window-logo {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px;
    width: 44px;
    height: 44px;
    transform: perspective(100px) rotateY(-10deg);
    transition: transform 0.5s ease;
}

.window-logo:hover {
    transform: perspective(100px) rotateY(0deg) scale(1.1);
}

.window-logo span {
    background-color: var(--accent-color);
    width: 100%;
    height: 100%;
    display: block;
    box-shadow: 0 0 15px rgba(0, 120, 215, 0.4);
    transition: background-color 0.3s ease;
}

.window-logo:hover span {
    background-color: var(--accent-hover);
    box-shadow: 0 0 20px rgba(0, 120, 215, 0.6);
}

.header h1 {
    font-size: 2.8rem;
    font-weight: 300;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.2rem;
    font-weight: 400;
}

/* Content Grid */
.content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 2.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
}

.card h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* System Info */
.info-grid {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 0.8rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.info-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.label {
    color: var(--text-secondary);
}

.value {
    font-weight: 600;
}

.clock-display {
    font-variant-numeric: tabular-nums;
    color: var(--text-primary);
    background: rgba(0,0,0,0.2);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    border: 1px solid rgba(255,255,255,0.05);
}

.status-online {
    color: var(--success-color);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 600;
}

.status-online::before {
    content: '';
    display: block;
    width: 8px;
    height: 8px;
    background-color: var(--success-color);
    border-radius: 50%;
    box-shadow: 0 0 12px var(--success-color);
    animation: pulse 2s infinite ease-in-out;
}

/* Quick Links */
.links-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.link-btn {
    text-decoration: none;
    color: var(--text-primary);
    background: rgba(0, 120, 215, 0.1);
    border: 1px solid rgba(0, 120, 215, 0.2);
    padding: 1.2rem 1rem;
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    font-size: 0.95rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.btn-icon {
    font-size: 1.5rem;
    margin-bottom: 0.2rem;
    transition: transform 0.3s ease;
}

.link-btn:hover {
    background: var(--accent-color);
    border-color: var(--accent-hover);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 120, 215, 0.4);
}

.link-btn:hover .btn-icon {
    transform: scale(1.1);
}

/* Footer */
.footer {
    margin-top: 3.5rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--card-border);
    padding-top: 2rem;
}

/* Animations */
@keyframes slideUpFade {
    0% {
        opacity: 0;
        transform: translateY(40px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(74, 222, 128, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(74, 222, 128, 0); }
}

/* Responsive constraints */
@media (max-width: 768px) {
    .content {
        grid-template-columns: 1fr;
    }
    .container {
        padding: 2rem;
    }
    .header h1 {
        font-size: 2.2rem;
    }
}