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

:root {
    --primary: #ff6b35;
    --primary-dark: #e55a2b;
    --secondary: #4ecdc4;
    --dark: #2c3e50;
    --light: #ecf0f1;
    --success: #27ae60;
    --warning: #f39c12;
    --danger: #e74c3c;
    --border: #dfe6e9;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-lg: rgba(0, 0, 0, 0.2);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--dark);
    line-height: 1.6;
}

/* Landing Page */
.landing-page {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.landing-container {
    max-width: 1200px;
    width: 100%;
}

.landing-hero {
    text-align: center;
    margin-bottom: 60px;
}

.logo-container {
    animation: fadeInDown 0.8s ease;
}

.logo {
    font-size: 6rem;
    margin-bottom: 20px;
    animation: bounce 2s infinite;
}

.landing-hero h1 {
    color: white;
    font-size: 4rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.tagline {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.5rem;
    font-style: italic;
}

.selection-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.selection-card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    text-decoration: none;
    color: var(--dark);
    box-shadow: 0 10px 30px var(--shadow-lg);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.selection-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.selection-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px var(--shadow-lg);
}

.selection-card:hover::before {
    transform: scaleX(1);
}

.card-icon {
    font-size: 5rem;
    margin-bottom: 20px;
    filter: grayscale(0.3);
    transition: all 0.3s ease;
}

.selection-card:hover .card-icon {
    filter: grayscale(0);
    transform: scale(1.1);
}

.selection-card h2 {
    font-size: 2rem;
    margin-bottom: 15px;
    color: var(--dark);
}

.selection-card > p {
    color: #7f8c8d;
    margin-bottom: 25px;
    font-size: 1.1rem;
}

.card-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 30px;
    width: 100%;
}

.card-features span {
    background: var(--light);
    padding: 12px 20px;
    border-radius: 10px;
    font-size: 0.95rem;
    color: var(--dark);
}

.btn-enter {
    background: var(--primary);
    color: white;
    border: none;
    padding: 15px 40px;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
}

.btn-enter:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
}

.btn-enter.admin {
    background: var(--secondary);
    box-shadow: 0 4px 15px rgba(78, 205, 196, 0.3);
}

.btn-enter.admin:hover {
    background: #45b7af;
    box-shadow: 0 6px 20px rgba(78, 205, 196, 0.4);
}

.landing-footer {
    text-align: center;
    color: white;
    padding: 20px;
    font-size: 0.9rem;
    opacity: 0.8;
}

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

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

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

    .tagline {
        font-size: 1.2rem;
    }

    .logo {
        font-size: 4rem;
    }

    .selection-cards {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .selection-card {
        padding: 30px 20px;
    }

    .card-icon {
        font-size: 4rem;
    }

    .selection-card h2 {
        font-size: 1.6rem;
    }
}

/* Common Styles */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow);
}

.btn-secondary {
    background: var(--light);
    color: var(--dark);
}

.btn-secondary:hover {
    background: var(--border);
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.card {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 4px 6px var(--shadow);
    margin-bottom: 25px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

/* Header común */
.header {
    background: white;
    padding: 20px 30px;
    box-shadow: 0 2px 10px var(--shadow);
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.header h1 {
    color: var(--dark);
    font-size: 1.8rem;
}

.header-actions {
    display: flex;
    gap: 10px;
    align-items: center;
}

/* Alert messages */
.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-weight: 500;
}

.alert-success {
    background: #d1e7dd;
    color: #0f5132;
    border: 1px solid #badbcc;
}

.alert-error {
    background: #f8d7da;
    color: #842029;
    border: 1px solid #f5c2c7;
}

.alert-info {
    background: #cff4fc;
    color: #055160;
    border: 1px solid #b6effb;
}

/* Loading spinner */
.loading {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid var(--light);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.text-center {
    text-align: center;
}

.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }