/* =========================================== */
/* CARTAS DE ACEPTACIÓN - HOGWARTS ACADEMY */
/* =========================================== */

.letters-section {
    background: linear-gradient(145deg, rgba(26, 43, 62, 0.92), rgba(35, 52, 71, 0.9));
    border-radius: 25px;
    padding: 60px 50px;
    margin-bottom: 80px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.7),
                inset 0 0 50px rgba(138, 109, 59, 0.1);
    border: 3px solid #8a6d3b;
    position: relative;
    overflow: hidden;
    animation: lettersSectionAppear 1.5s ease-out 1.2s both;
}

@keyframes lettersSectionAppear {
    from { opacity: 0; transform: translateY(50px); }
    to { opacity: 1; transform: translateY(0); }
}

.letters-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('https://www.transparenttextures.com/patterns/parchment.png');
    opacity: 0.08;
    z-index: 0;
    animation: parchmentMove 40s linear infinite;
}

@keyframes parchmentMove {
    0% { background-position: 0 0; }
    100% { background-position: 400px 400px; }
}

.letters-section::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 30%, rgba(240, 217, 163, 0.05) 0%, transparent 50%),
                radial-gradient(circle at 80% 70%, rgba(138, 109, 59, 0.05) 0%, transparent 50%);
    animation: magicDust 20s ease-in-out infinite;
    pointer-events: none;
}

@keyframes magicDust {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
}

.letters-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
    margin-top: 50px;
    position: relative;
    z-index: 1;
}

/* === ESTILOS DE CADA CARTA === */
.letter-card {
    background: linear-gradient(145deg, rgba(249, 245, 235, 0.98), rgba(242, 237, 225, 0.97));
    border-radius: 20px;
    padding: 30px;
    position: relative;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
    transition: all 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 3px solid #d4c19c;
    overflow: hidden;
    min-height: 380px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    animation: cardEntrance 0.8s ease-out forwards;
    opacity: 0;
    transform: translateY(30px);
}

.letter-card:nth-child(1) { animation-delay: 0.2s; }
.letter-card:nth-child(2) { animation-delay: 0.4s; }
.letter-card:nth-child(3) { animation-delay: 0.6s; }
.letter-card:nth-child(4) { animation-delay: 0.8s; }
.letter-card:nth-child(5) { animation-delay: 1s; }

@keyframes cardEntrance {
    to { opacity: 1; transform: translateY(0); }
}

.letter-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('https://www.transparenttextures.com/patterns/paper-fibers.png');
    opacity: 0.4;
    z-index: 0;
    animation: fibersMove 60s linear infinite;
}

@keyframes fibersMove {
    0% { background-position: 0 0; }
    100% { background-position: 500px 500px; }
}

.letter-card::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, #f0d9a3, #8a6d3b, #d4c19c, #f0d9a3);
    background-size: 400% 400%;
    border-radius: 22px;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.5s ease;
    animation: borderGlow 3s ease-in-out infinite;
}

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

.letter-card:hover {
    transform: translateY(-15px) scale(1.03);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4),
                0 0 40px rgba(138, 109, 59, 0.3);
    border-color: #8a6d3b;
}

.letter-card:hover::after {
    opacity: 0.3;
}

/* === CARTA DESBLOQUEADA === */
.letter-card.unlocked {
    border-color: #8a6d3b;
    background: linear-gradient(145deg, rgba(255, 253, 247, 0.99), rgba(250, 247, 237, 0.98));
    box-shadow: 0 15px 35px rgba(138, 109, 59, 0.4),
                inset 0 0 30px rgba(240, 217, 163, 0.2);
    animation: unlockedGlow 2s ease-in-out infinite;
}

@keyframes unlockedGlow {
    0%, 100% { box-shadow: 0 15px 35px rgba(138, 109, 59, 0.4), inset 0 0 30px rgba(240, 217, 163, 0.2); }
    50% { box-shadow: 0 15px 40px rgba(138, 109, 59, 0.6), inset 0 0 40px rgba(240, 217, 163, 0.3); }
}

/* === SELLO DE LA CARTA === */
.letter-seal {
    position: absolute;
    top: -25px;
    right: -25px;
    width: 80px;
    height: 80px;
    background: radial-gradient(circle at 30% 30%, #5a5a5a, #3a3a3a, #5a5a5a);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
    z-index: 2;
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    animation: sealFloat 6s ease-in-out infinite;
}

@keyframes sealFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-5px) rotate(5deg); }
}

.letter-seal i {
    color: #f0d9a3;
    font-size: 1.8rem;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
    animation: lockPulse 2s ease-in-out infinite;
}

@keyframes lockPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* Sello desbloqueado */
.letter-card.unlocked .letter-seal {
    background: radial-gradient(circle at 30% 30%, #8a6d3b, #5a4a1e);
    transform: rotate(15deg);
}

.letter-card.unlocked .letter-seal i {
    display: flex;
    align-items: center;
    justify-content: center;
    color: #f0d9a3;
    font-size: 2rem;
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
    animation: unlockedIconPulse 2s ease-in-out infinite;
}

@keyframes unlockedIconPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); color: #ffffff; text-shadow: 0 0 15px gold; }
}

/* === CONTENIDO DE LA CARTA === */
.letter-content {
    position: relative;
    z-index: 1;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.letter-content h3 {
    font-family: 'Cinzel', serif;
    color: #8a6d3b;
    font-size: 2rem;
    margin-bottom: 20px;
    border-bottom: 3px solid #d4c19c;
    padding-bottom: 15px;
    text-align: center;
    letter-spacing: 2px;
    position: relative;
}

.letter-content h3::after {
    content: '📜';
    position: absolute;
    right: 10px;
    animation: scrollWiggle 3s ease-in-out infinite;
}

@keyframes scrollWiggle {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(-10deg); }
    75% { transform: rotate(10deg); }
}

.letter-date {
    color: #7a6b4a;
    font-size: 1.1rem;
    margin-bottom: 15px;
    font-weight: 700;
    text-align: center;
    background: linear-gradient(90deg, rgba(138, 109, 59, 0.15), rgba(212, 193, 156, 0.1), rgba(138, 109, 59, 0.15));
    padding: 12px;
    border-radius: 10px;
    border: 2px solid rgba(138, 109, 59, 0.3);
    position: relative;
    overflow: hidden;
}

.letter-date::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(240, 217, 163, 0.3), transparent);
    animation: dateShimmer 3s ease-in-out infinite;
}

@keyframes dateShimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* === ESTADO DE LA CARTA === */
.letter-status {
    font-family: 'Cinzel', serif;
    font-weight: 900;
    margin-bottom: 25px;
    font-size: 1.3rem;
    text-align: center;
    letter-spacing: 2px;
    padding: 12px;
    border-radius: 10px;
    transition: all 0.3s ease;
}

/* Estado BLOQUEADA */
.letter-status {
    color: #a94442;
    background: linear-gradient(90deg, rgba(169, 68, 66, 0.15), rgba(169, 68, 66, 0.1), rgba(169, 68, 66, 0.15));
    border: 2px solid rgba(169, 68, 66, 0.3);
}

/* Estado DESBLOQUEADA */
.letter-card.unlocked .letter-status {
    color: #3c763d;
    background: linear-gradient(90deg, rgba(60, 118, 61, 0.2), rgba(60, 118, 61, 0.15), rgba(60, 118, 61, 0.2));
    border-color: rgba(60, 118, 61, 0.5);
    animation: unlockedStatusPulse 1.5s ease-in-out infinite;
}

/* Estado LEÍDA */
.letter-card.unlocked .letter-status.leida,
.letter-card.unlocked .letter-status[style*="#8a6d3b"] {
    color: #8a6d3b;
    background: linear-gradient(90deg, rgba(138, 109, 59, 0.15), rgba(138, 109, 59, 0.1), rgba(138, 109, 59, 0.15));
    border-color: rgba(138, 109, 59, 0.3);
}

@keyframes unlockedStatusPulse {
    0%, 100% { 
        box-shadow: 0 0 10px rgba(60, 118, 61, 0.2);
        transform: scale(1);
    }
    50% { 
        box-shadow: 0 0 20px rgba(60, 118, 61, 0.4);
        transform: scale(1.02);
    }
}

/* === CONTADOR PEQUEÑO === */
.countdown-small {
    font-family: 'Cinzel', serif;
    background: linear-gradient(90deg, rgba(138, 109, 59, 0.2), rgba(212, 193, 156, 0.15), rgba(138, 109, 59, 0.2));
    padding: 15px;
    border-radius: 12px;
    text-align: center;
    margin-bottom: 25px;
    font-size: 1rem;
    color: #8a6d3b;
    font-weight: 800;
    border: 2px solid rgba(138, 109, 59, 0.4);
    letter-spacing: 2px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.countdown-small::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(240, 217, 163, 0.2), transparent);
    animation: countdownShimmer 2s ease-in-out infinite;
}

@keyframes countdownShimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Animación para carta disponible */
@keyframes availablePulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 5px rgba(60, 118, 61, 0.3);
    }
    50% {
        transform: scale(1.02);
        box-shadow: 0 0 15px rgba(60, 118, 61, 0.5);
    }
}

.countdown-small[style*="CARTA DISPONIBLE"] {
    animation: availablePulse 1.5s ease-in-out infinite;
}

/* === DESCRIPCIÓN === */
.letter-description {
    color: #5a523e;
    font-size: 1.15rem;
    line-height: 1.6;
    text-align: center;
    margin-top: auto;
    padding-top: 20px;
    border-top: 2px solid rgba(138, 109, 59, 0.3);
    font-style: italic;
    position: relative;
}

.letter-description::before {
    content: '"';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 3rem;
    color: rgba(138, 109, 59, 0.3);
    font-family: 'Playfair Display', serif;
}

/* === CARTA DE CUMPLEAÑOS === */
.letter-card.birthday {
    background: linear-gradient(145deg, rgba(255, 240, 245, 0.98), rgba(255, 230, 240, 0.97));
    border: 3px solid #ff6b9d;
}

.letter-card.birthday::after {
    background: linear-gradient(45deg, #ff6b9d, #ff8fab, #ffb3c1, #ff6b9d);
}

.letter-card.birthday:hover {
    border-color: #ff4081;
}

.letter-card.birthday .letter-content h3 {
    color: #ff4081;
    border-bottom-color: #ffb3c1;
}

.letter-card.birthday .letter-seal {
    background: radial-gradient(circle at 30% 30%, #ff4081, #ff6b9d, #ff8fab);
}

.letter-card.birthday .letter-seal i {
    color: white;
    animation: giftPulse 2s ease-in-out infinite;
}

@keyframes giftPulse {
    0%, 100% { transform: scale(1) rotate(0deg); }
    50% { transform: scale(1.2) rotate(10deg); }
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .letters-section {
        padding: 40px 30px;
    }
    
    .letters-container {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    
    .letter-card {
        min-height: 360px;
    }
    
    .letter-content h3 {
        font-size: 1.7rem;
    }
    
    .letter-status {
        font-size: 1.1rem;
    }
    
    .letter-seal {
        width: 70px;
        height: 70px;
        top: -15px;
        right: -15px;
    }
    
    .letter-seal i {
        font-size: 1.5rem;
    }
    
    .countdown-small {
        font-size: 0.9rem;
        padding: 12px;
    }
}

@media (max-width: 480px) {
    .letters-section {
        padding: 30px 20px;
    }
    
    .letter-card {
        padding: 25px;
    }
    
    .letter-content h3 {
        font-size: 1.5rem;
    }
    
    .letter-date {
        font-size: 0.9rem;
    }
    
    .letter-status {
        font-size: 1rem;
        padding: 8px;
    }
    
    .countdown-small {
        font-size: 0.8rem;
        padding: 10px;
    }
    
    .letter-description {
        font-size: 1rem;
    }
}
/* Estado Bloqueado */
.letter-card.locked {
    filter: grayscale(0.8);
    opacity: 0.7;
    border: 2px dashed #666;
    pointer-events: none; /* No se puede interactuar */
}

.letter-card.locked .status-badge {
    background: #444;
    color: #eee;
}

/* Estado Desbloqueado */
.letter-card.unlocked {
    filter: none;
    opacity: 1;
    border: 3px solid #8a6d3b;
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
    cursor: pointer;
}

.letter-card.unlocked .status-badge {
    background: #8a6d3b;
    color: #fff;
    font-weight: bold;
}

.status-badge {
    padding: 5px 10px;
    border-radius: 5px;
    font-size: 0.8rem;
    margin-bottom: 10px;
    display: inline-block;
}

.countdown-text {
    font-family: 'Courier New', monospace;
    color: #e74c3c;
    font-weight: bold;
    margin-top: 10px;
}

.open-btn {
    margin-top: 15px;
    padding: 10px 20px;
    background: #8a6d3b;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
}

.open-btn:hover {
    background: #a68b5a;
}