/* Paleta de colores verde oscuro elegante (Dark Mode Ultra Negro) */
:root {
    --color-primary: #6AC586;      /* Verde fresco vibrante */
    --color-dark: #0f2818;         /* Verde bosque ultra oscuro */
    --color-light: #1a3a28;        /* Verde oscuro medio */
    --color-lighter: #000000;      /* Fondo negro puro */
    --color-text: #ffffff;         /* Texto blanco */
    --color-text-light: #88aa88;   /* Texto más tenue */
    --color-accent: #81d4be;       /* Verde accento brillante */
    --color-white: #0a0f14;        /* Fondo de tarjetas casi negro */
    --color-shadow: rgba(106, 197, 134, 0.3);
    --color-glow: rgba(106, 197, 134, 0.5);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #000000;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    color: var(--color-text);
}

.container {
    text-align: center;
    max-width: 900px;
    width: 100%;
}

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

h1 {
    font-size: 3.5rem;
    color: var(--color-accent);
    font-weight: 300;
    letter-spacing: -1px;
    margin-bottom: 15px;
    text-shadow: 0 0 20px var(--color-glow);
    transition: text-shadow 0.3s ease;
}

h1:hover {
    text-shadow: 0 0 40px var(--color-glow);
}

.subtitle {
    font-size: 1.1rem;
    color: var(--color-text-light);
    font-weight: 300;
    letter-spacing: 1px;
}

.divider {
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    margin: 30px auto;
    border-radius: 2px;
    box-shadow: 0 0 20px var(--color-primary);
    animation: dividerGlow 2s ease-in-out infinite;
}

@keyframes dividerGlow {
    0%, 100% { box-shadow: 0 0 20px var(--color-primary); }
    50% { box-shadow: 0 0 40px var(--color-primary); }
}

/* Sección de explicación */
.about-section {
    background: var(--color-white);
    padding: 40px 35px;
    border-radius: 15px;
    box-shadow: 0 8px 25px var(--color-shadow), 0 0 30px var(--color-glow);
    margin-bottom: 50px;
    animation: fadeInUp 0.8s ease-out 0.1s both;
    border-top: 5px solid var(--color-primary);
    transition: all 0.3s ease;
    border: 2px solid transparent;
    border-top: 5px solid var(--color-primary);
}

.about-section:hover {
    box-shadow: 0 8px 35px var(--color-shadow), 0 0 50px var(--color-glow);
    border-color: var(--color-primary);
}

.about-section h2 {
    font-size: 1.8rem;
    color: var(--color-accent);
    margin-bottom: 20px;
    font-weight: 600;
}

.about-section p {
    font-size: 1rem;
    color: var(--color-text-light);
    line-height: 1.8;
    font-weight: 300;
}

.features-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 25px;
}

.feature-tag {
    background: var(--color-light);
    color: var(--color-accent);
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    border: 2px solid var(--color-primary);
    transition: all 0.3s ease;
    cursor: pointer;
}

.feature-tag:hover {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: 0 0 20px var(--color-primary);
    transform: translateY(-3px);
}

/* Secciones de tarjetas */
.sections {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 20px;
}

.card {
    background: var(--color-white);
    padding: 40px 30px;
    border-radius: 15px;
    box-shadow: 0 8px 25px var(--color-shadow);
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.23, 1, 0.320, 1);
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    animation: fadeInUp 0.8s ease-out;
    animation-fill-mode: forwards;
    opacity: 0;
    position: relative;
    border: 2px solid transparent;
    overflow: hidden;
}

.card:nth-child(1) {
    animation-delay: 0.2s;
}

.card:nth-child(2) {
    animation-delay: 0.4s;
}

.card:hover {
    transform: translateY(-12px);
    box-shadow: 0 20px 50px var(--color-shadow), 0 0 30px var(--color-glow);
    border-color: var(--color-primary);
}

.card-icon {
    font-size: 3.5rem;
    margin-bottom: 20px;
    transition: transform 0.4s ease;
}

.card:hover .card-icon {
    transform: scale(1.15) rotate(5deg);
}

.card h2 {
    font-size: 1.6rem;
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: 10px;
}

.card p {
    font-size: 0.95rem;
    color: var(--color-text-light);
    font-weight: 300;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transition: left 0.4s ease-out;
    border-radius: 2px;
    box-shadow: 0 0 15px var(--color-primary);
}

.card:hover::before {
    left: 0;
}

.card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, var(--color-glow), transparent);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

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

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

footer {
    margin-top: 80px;
    color: var(--color-text-light);
    font-size: 0.9rem;
    font-weight: 300;
    animation: fadeIn 1.2s ease-out 0.6s both;
}

/* Animaciones */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

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

    .card {
        padding: 30px 20px;
    }

    .about-section {
        padding: 30px 20px;
    }
}

@media (max-width: 600px) {
    h1 {
        font-size: 2rem;
    }

    header {
        margin-bottom: 40px;
    }

    .subtitle {
        font-size: 0.95rem;
    }

    .card h2 {
        font-size: 1.3rem;
    }

    .about-section h2 {
        font-size: 1.4rem;
    }

    .about-section p {
        font-size: 0.9rem;
    }
}