:root {
    --itc-azul: #003366;
    --itc-naranja: #FF6B35;
    --itc-oro: #D9B348;
    --itc-azul-claro: #4B9CD3;
    --texto-blanco: #FFFFFF;
    --texto-negro: #333333;
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, var(--itc-azul), var(--itc-azul-claro));
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    color: var(--texto-blanco);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0;
    padding: 20px;
    text-align: center;
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.container {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    max-width: 800px;
    width: 100%;
    position: relative;
    margin: 20px;
}

.back-button {
    position: absolute;
    top: 20px;
    left: 20px;
    padding: 10px 15px;
    background-color: var(--itc-naranja);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 5px;
    z-index: 10;
}

.back-button:hover {
    background-color: var(--itc-oro);
    transform: translateX(-3px);
}

.logo-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    margin: 0 auto 1.5rem;
    position: relative;
}

.main-logo {
    max-width: 250px;
    width: 100%;
    height: auto;
    filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.3));
    animation: float 6s ease-in-out infinite;
}

.institutional-logo {
    max-width: 150px;
    width: 100%;
    height: auto;
    filter: drop-shadow(0 5px 10px rgba(0, 0, 0, 0.2));
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.celebration-title {
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--itc-oro);
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    background: linear-gradient(to right, var(--itc-naranja), var(--itc-oro));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.institution-name {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    font-weight: 600;
    color: var(--texto-blanco);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.countdown-container {
    margin: 2rem 0;
}

.countdown-label {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.countdown-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

.countdown-card {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    padding: 1.5rem 1rem;
    border: 1px solid var(--itc-naranja);
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

.countdown-number {
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--itc-oro);
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.countdown-unit {
    font-size: 1rem;
    font-weight: 500;
    color: var(--texto-blanco);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.event-date {
    margin-top: 1.5rem;
    font-size: 1.2rem;
    color: var(--itc-oro);
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.social-media {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 2rem;
}

.social-icon {
    color: var(--texto-blanco);
    background: rgba(255, 255, 255, 0.1);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    font-size: 1.1rem;
    border: 1px solid var(--itc-naranja);
}

.social-icon:hover {
    background: var(--itc-naranja);
    transform: translateY(-3px);
}

/* Animaciones y estados especiales */
@keyframes pulse {
    0% { transform: scale(1); box-shadow: 0 0 5px rgba(255, 107, 53, 0.5); }
    100% { transform: scale(1.05); box-shadow: 0 0 20px rgba(255, 107, 53, 0.8); }
}

.last-week .countdown-card { 
    animation: pulse 1.5s infinite alternate; 
    background: rgba(255, 107, 53, 0.1);
}

.last-day .countdown-card { 
    animation: pulse 1s infinite alternate; 
    background: rgba(255, 107, 53, 0.2);
    border-color: var(--itc-oro);
}

.last-hour .countdown-card { 
    animation: pulse 0.5s infinite alternate; 
    background: rgba(255, 107, 53, 0.3);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1.5rem;
    }
    
    .celebration-title {
        font-size: 2.2rem;
    }
    
    .institution-name {
        font-size: 1.3rem;
    }
    
    .countdown-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.8rem;
    }
    
    .countdown-number {
        font-size: 2.2rem;
    }
    
    .main-logo {
        max-width: 200px;
    }
    
    .institutional-logo {
        max-width: 120px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 1rem;
        margin: 10px;
    }
    
    .celebration-title {
        font-size: 1.8rem;
        margin-top: 1rem;
    }
    
    .institution-name {
        font-size: 1.1rem;
    }
    
    .countdown-number {
        font-size: 1.8rem;
    }
    
    .countdown-unit {
        font-size: 0.8rem;
    }
    
    .event-date {
        font-size: 1rem;
    }
    
    .back-button {
        top: 10px;
        left: 10px;
        padding: 8px 12px;
        font-size: 0.9rem;
    }
    
    .main-logo {
        max-width: 180px;
    }
    
    .institutional-logo {
        max-width: 100px;
    }
    
    .social-media {
        margin-top: 1.5rem;
    }
    
    .social-icon {
        width: 35px;
        height: 35px;
        font-size: 1rem;
    }
}