:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --accent-color: #38bdf8;
    --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem;
    background-image: 
        radial-gradient(at 0% 0%, rgba(56, 189, 248, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(129, 140, 248, 0.15) 0px, transparent 50%);
    background-attachment: fixed;
    animation: pulseBg 10s ease-in-out infinite alternate;
}

/* Animación sutil de fondo */
@keyframes pulseBg {
    0% { background-position: 0% 0%; }
    100% { background-position: 100% 100%; }
}

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

/* --- HEADER & ANIMACIONES DE ENTRADA --- */
header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2.5rem;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
    animation: fadeInDown 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.avatar {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem auto;
    font-size: 2.5rem;
    font-weight: 700;
    color: #fff;
    box-shadow: 0 10px 15px -3px rgba(56, 189, 248, 0.3);
    animation: float 4s ease-in-out infinite;
}

h1 {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 0.5rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    font-weight: 300;
}

/* --- SECCIÓN PRINCIPAL --- */
.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.2s backwards;
}

.section-title::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 24px;
    background: var(--accent-color);
    border-radius: 2px;
}

/* --- TARJETAS --- */
.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.4s backwards;
}

.card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: rgba(56, 189, 248, 0.5);
    box-shadow: 0 20px 30px -10px rgba(0, 0, 0, 0.5);
}

.card-icon {
    font-size: 2.2rem;
    margin-bottom: 1rem;
    display: inline-block;
    transition: transform 0.3s ease;
}

.card:hover .card-icon {
    transform: scale(1.2) rotate(5deg);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.card-desc {
    color: var(--text-muted);
    font-size: 0.925rem;
    line-height: 1.5;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

/* --- BOTONES Y EFECTOS --- */
.card-actions {
    display: flex;
    gap: 0.75rem;
}

.btn {
    flex: 1;
    padding: 0.75rem;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 4px 12px rgba(56, 189, 248, 0.2);
}

.btn-primary:hover {
    opacity: 0.95;
    box-shadow: 0 6px 16px rgba(56, 189, 248, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-2px);
}

footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: auto;
    padding-top: 2rem;
    animation: fadeIn 1s ease 0.6s backwards;
}

/* --- MODAL --- */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(8px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: var(--bg-color);
    width: 90%;
    max-width: 900px;
    height: 85vh;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-header {
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color 0.2s;
}

.close-btn:hover { color: #fff; }
.modal-body { flex: 1; }
.modal-body iframe { width: 100%; height: 100%; border: none; }

/* --- KEYFRAMES DE 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; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}