* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;

    font-family: Arial, sans-serif;

    background: linear-gradient(
        135deg,
        #90a4ae,
        #78909c
    );

    color: #31536d;

    display: flex;
    flex-direction: column;
    align-items: center;

    padding: 60px 20px;
}



header {
    text-align: center;

    margin-bottom: 45px;

    animation: aparecer 1s ease;
}

header h1 {
    margin: 0;

    font-size: 3rem;

    color: #3d7096;

    letter-spacing: 1px;
}

header p {
    margin-top: 14px;

    font-size: 1.1rem;

    color: #5d7890;
}



.menu {
    width: min(520px, 100%);

    display: flex;
    flex-direction: column;

    gap: 18px;
}




.menu-button {
    position: relative;

    display: block;

    padding: 20px 25px;

    
    background: rgba(255, 255, 255, 0.65);

    border: 2px solid rgba(255, 255, 255, 0.8);

    border-radius: 20px;

    color: #3d7096;

    text-decoration: none;

    text-align: center;

    font-size: 1.08rem;
    font-weight: bold;

    box-shadow:
        0 8px 20px rgba(60, 110, 145, 0.12);

    transition:
        transform 0.25s ease,
        box-shadow 0.25s ease,
        background 0.25s ease;
}



.menu-button:hover {
    transform: translateY(-6px);

    background: rgba(255, 255, 255, 0.9);

    box-shadow:
        0 14px 30px rgba(60, 110, 145, 0.22);
}



.menu-button:active {
    transform: translateY(-1px) scale(0.97);

    box-shadow:
        0 5px 12px rgba(60, 110, 145, 0.18);
}




footer {
    margin-top: 55px;

    text-align: center;

    font-size: 0.9rem;

    color: #66849a;
}




@keyframes aparecer {

    from {
        opacity: 0;

        transform: translateY(-20px);
    }

    to {
        opacity: 1;

        transform: translateY(0);
    }
}




@media (max-width: 600px) {

    body {
        padding: 40px 18px;
    }

    header h1 {
        font-size: 2.3rem;
    }

    header p {
        font-size: 1rem;
    }

    .menu-button {
        padding: 18px 20px;
    }
}


.menu-button {
    opacity: 0;

    animation: aparecerBoton 0.7s ease forwards;
}

.button-1 {
    animation-delay: 0.2s;
}

.button-2 {
    animation-delay: 0.35s;
}

.button-3 {
    animation-delay: 0.5s;
}

.button-4 {
    animation-delay: 0.65s;
}

.button-5 {
    animation-delay: 0.8s;
}


@keyframes aparecerBoton {

    from {
        opacity: 0;
        transform: translateY(25px);
    }

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

}



.decorations {
    position: fixed;

    inset: 0;

    pointer-events: none;

    overflow: hidden;

    z-index: -1;
}


.sparkle {
    position: absolute;

    color: rgba(255, 255, 255, 0.7);

    font-size: 24px;

    animation: flotar 5s ease-in-out infinite;
}



.sparkle-1 {
    top: 15%;
    left: 12%;

    animation-delay: 0s;
}

.sparkle-2 {
    top: 28%;
    right: 15%;

    font-size: 18px;

    animation-delay: 1s;
}

.sparkle-3 {
    top: 70%;
    left: 8%;

    font-size: 20px;

    animation-delay: 2s;
}

.sparkle-4 {
    top: 78%;
    right: 10%;

    animation-delay: 3s;
}

.sparkle-5 {
    top: 45%;
    left: 20%;

    font-size: 30px;

    animation-delay: 1.5s;
}

.sparkle-6 {
    top: 55%;
    right: 22%;

    font-size: 28px;

    animation-delay: 3.5s;
}



@keyframes flotar {

    0% {
        transform: translateY(0);
        opacity: 0.35;
    }

    50% {
        transform: translateY(-15px);
        opacity: 0.8;
    }

    100% {
        transform: translateY(0);
        opacity: 0.35;
    }

}


.coming-soon {
    width: min(600px, 100%);

    text-align: center;

    margin: auto;

    animation: aparecer 1s ease;
}


.heart {
    font-size: 4rem;

    margin-bottom: 20px;

    animation: latido 2s ease-in-out infinite;
}


.coming-soon h1 {
    font-size: 2.5rem;

    color: #3d7096;

    margin-bottom: 25px;
}


.message {
    font-size: 1.1rem;

    line-height: 1.7;

    color: #5d7890;
}


.special-message {
    margin-top: 30px;

    padding: 25px;

    background: rgba(255, 255, 255, 0.55);

    border-radius: 20px;

    font-size: 1.2rem;

    line-height: 1.7;

    color: #397ca8;

    box-shadow:
        0 8px 20px rgba(60, 110, 145, 0.12);
}


.back-button {
    display: inline-block;

    margin-top: 35px;

    padding: 14px 24px;

    background: rgba(255, 255, 255, 0.7);

    border-radius: 15px;

    color: #397ca8;

    text-decoration: none;

    font-weight: bold;

    transition:
        transform 0.25s ease,
        background 0.25s ease;
}


.back-button:hover {
    transform: translateY(-4px);

    background: rgba(255, 255, 255, 0.95);
}


@keyframes latido {

    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.12);
    }

    100% {
        transform: scale(1);
    }

}



.coming-soon {

    width: min(650px, 100%);

    text-align: center;

    margin: auto;

    padding: 50px 30px;

    animation: aparecer 1s ease;

}


.heart {

    font-size: 5rem;

    margin-bottom: 10px;

    filter: drop-shadow(
        0 8px 15px rgba(60, 110, 145, 0.25)
    );

    animation: latido 2.5s ease-in-out infinite;

}



.small-title {

    margin: 0 0 15px 0;

    font-size: 0.75rem;

    letter-spacing: 4px;

    font-weight: bold;

    color: #7197b2;

    opacity: 0;

    animation: aparecerSuave 1s ease forwards;

    animation-delay: 0.3s;

}



.coming-soon h1 {

    margin: 0;

    font-size: clamp(2rem, 6vw, 3.2rem);

    line-height: 1.15;

    color: #3d7096;

    opacity: 0;

    animation: aparecerDesdeAbajo 1s ease forwards;

    animation-delay: 0.5s;

}



.coming-soon .message {

    max-width: 500px;

    margin: 25px auto 0;

    font-size: 1.1rem;

    line-height: 1.8;

    color: #5d7890;

    opacity: 0;

    animation: aparecerDesdeAbajo 1s ease forwards;

    animation-delay: 0.7s;

}



.special-message {

    position: relative;

    margin: 40px auto 0;

    padding: 30px 35px;

    max-width: 560px;

    background: rgba(255, 255, 255, 0.55);

    border: 1px solid rgba(255, 255, 255, 0.8);

    border-radius: 25px;

    box-shadow:
        0 15px 35px rgba(60, 110, 145, 0.12);

    backdrop-filter: blur(8px);

    opacity: 0;

    animation:
        aparecerDesdeAbajo 1s ease forwards,
        flotarCaja 5s ease-in-out infinite;

    animation-delay: 0.9s, 2s;

}


.special-message p {

    margin: 0;

    font-size: 1.25rem;

    line-height: 1.7;

    font-style: italic;

    color: #397ca8;

}




.quote-mark {

    position: absolute;

    top: 5px;

    left: 20px;

    font-size: 4rem;

    color: rgba(61, 112, 150, 0.15);

    font-family: Georgia, serif;

}


.quote-mark.right {

    top: auto;

    left: auto;

    right: 20px;

    bottom: -25px;

}


.future-text {

    margin-top: 30px;

    font-size: 1.15rem;

    color: #5d7890;

    opacity: 0;

    animation: aparecerSuave 1s ease forwards;

    animation-delay: 1.2s;

}



.back-button {

    display: inline-block;

    margin-top: 30px;

    padding: 15px 28px;

    background: rgba(255, 255, 255, 0.7);

    border: 1px solid rgba(255, 255, 255, 0.8);

    border-radius: 18px;

    color: #397ca8;

    text-decoration: none;

    font-weight: bold;

    box-shadow:
        0 8px 20px rgba(60, 110, 145, 0.1);

    transition:
        transform 0.25s ease,
        box-shadow 0.25s ease,
        background 0.25s ease;

    opacity: 0;

    animation: aparecerDesdeAbajo 1s ease forwards;

    animation-delay: 1.4s;

}


.back-button:hover {

    transform: translateY(-5px);

    background: rgba(255, 255, 255, 0.95);

    box-shadow:
        0 12px 25px rgba(60, 110, 145, 0.18);

}


.back-button:active {

    transform: scale(0.96);

}



@keyframes aparecerSuave {

    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }

}


@keyframes aparecerDesdeAbajo {

    from {
        opacity: 0;
        transform: translateY(25px);
    }

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

}


@keyframes flotarCaja {

    0% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-6px);
    }

    100% {
        transform: translateY(0);
    }

}




.decorations {

    position: fixed;

    inset: 0;

    pointer-events: none;

    overflow: hidden;

    z-index: 0;

}


.sparkle {

    position: absolute;

    color: rgba(255, 255, 255, 0.75);

    font-size: 25px;

    animation: flotarEstrella 5s ease-in-out infinite;

}


.sparkle-1 {
    top: 15%;
    left: 10%;
}


.sparkle-2 {
    top: 25%;
    right: 12%;
    font-size: 18px;
    animation-delay: 1s;
}


.sparkle-3 {
    top: 70%;
    left: 8%;
    font-size: 20px;
    animation-delay: 2s;
}


.sparkle-4 {
    top: 78%;
    right: 10%;
    animation-delay: 3s;
}


.sparkle-5 {
    top: 45%;
    left: 18%;
    font-size: 30px;
    animation-delay: 1.5s;
}


.sparkle-6 {
    top: 55%;
    right: 20%;
    font-size: 28px;
    animation-delay: 3.5s;
}


@keyframes flotarEstrella {

    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 0.2;
    }

    50% {
        transform: translateY(-15px) rotate(20deg);
        opacity: 0.9;
    }

    100% {
        transform: translateY(0) rotate(0deg);
        opacity: 0.2;
    }

}



.coming-soon {

    position: relative;

    z-index: 1;

}


.anniversary {

    width: min(700px, 100%);

    margin: auto;

    text-align: center;

    padding: 50px 25px;

    animation: aparecer 1s ease;

}



.anniversary-heart {

    font-size: 4.5rem;

    margin-bottom: 10px;

    animation: latido 2.5s ease-in-out infinite;

    filter: drop-shadow(
        0 8px 15px rgba(60, 110, 145, 0.2)
    );

}



.anniversary-small {

    margin: 0;

    font-size: 0.75rem;

    letter-spacing: 4px;

    font-weight: bold;

    color: #7197b2;

}



.anniversary h1 {

    margin: 12px 0 15px;

    font-size: clamp(2.2rem, 7vw, 3.5rem);

    color: #3d7096;

}



.anniversary-intro {

    margin-bottom: 35px;

    font-size: 1.1rem;

    color: #5d7890;

}



.open-letter {

    border: none;

    padding: 17px 30px;

    border-radius: 18px;

    background: rgba(255, 255, 255, 0.7);

    border: 1px solid rgba(255, 255, 255, 0.9);

    color: #397ca8;

    font-size: 1rem;

    font-weight: bold;

    cursor: pointer;

    box-shadow:
        0 8px 20px rgba(60, 110, 145, 0.12);

    transition:
        transform 0.25s ease,
        box-shadow 0.25s ease,
        background 0.25s ease;

}


.open-letter:hover {

    transform: translateY(-5px);

    background: rgba(255, 255, 255, 0.95);

    box-shadow:
        0 14px 28px rgba(60, 110, 145, 0.2);

}


.open-letter:active {

    transform: scale(0.96);

}



.letter {

    display: none;

    text-align: left;

    margin: 35px auto 0;

    padding: 40px;

    max-width: 620px;

    background: rgba(255, 255, 255, 0.68);

    border: 1px solid rgba(255, 255, 255, 0.9);

    border-radius: 25px;

    box-shadow:
        0 18px 40px rgba(60, 110, 145, 0.15);

    backdrop-filter: blur(10px);

}



.letter-visible {

    display: block;

    animation: cartaAparecer 0.8s ease;

}



.letter p {

    margin: 0 0 22px;

    color: #4f7189;

    font-size: 1.05rem;

    line-height: 1.8;

}



.letter p:first-child {

    color: #397ca8;

    font-size: 1.25rem;

    font-weight: bold;

}



.letter-ending {

    margin-top: 30px;

    text-align: center;

    color: #397ca8;

    font-weight: bold;

    line-height: 1.6;

}



@keyframes cartaAparecer {

    from {

        opacity: 0;

        transform:
            translateY(25px)
            scale(0.97);

    }

    to {

        opacity: 1;

        transform:
            translateY(0)
            scale(1);

    }

}



@media (max-width: 600px) {

    .anniversary {

        padding: 35px 18px;

    }

    .letter {

        padding: 28px 22px;

    }

    .letter p {

        font-size: 1rem;

    }

}


.songs-page{
    width: min(700, 100%);
    margin: auto;
    padding: 50px 25px;
    text-align: center;
    animation: aparecer 1s ease;
}

.songs-small{
    margin: 0 0 15px;
    font-size: 0.75rem;
    letter-spacing: 4px;
    font-weight: bold;
    color: #7197b2;
}

.songs-page h1{
    margin: 0;
    font-size: clamp(2.2rem, 7vw, 3.5rem);
    font-size: 1.05rem;
    line-height: 1.8;
    color: #3d7096;

}

.songs-intro{
    margin: 25px auto 0;
    max-width: 500px;
    font-size: 1.05rem;
    line-height: 1.8;
    color: #5d7890;
}

.songs-list{
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 40px;
}

.songs-card{
    padding: 28px;
    text-align: center;

    background: rgba(255, 255, 255, 0.62);

    border: 1px solid rgba(255, 255, 255, 0.85);

    border-radius: 22px;

    box-shadow: 
    0 12px 30px rgba(60, 110, 145, 0.12);

    backdrop-filter: blur(8px);

    transition: 
    transform 0.25s ease,
    box-shadow 0,25s ease;

}

.songs-card:hover{
    transform: translateY(-4px);

    box-shadow: 
    0 16px 35px rgba(60. 110, 145, 0.17);
}

.song-info h2{
    margin: 0;

    color: #397ca8;

    font-size: 1.45rem;
}

.song-artist{
    margin: 7px 0 20px;

    color: #7190a5;

    font-size: 0.95;
}

.why-button{
    padding: 11px 18px;

    border: 1px solid rgba(255, 255, 255, 0.9);
    border-radius: 14px;

    background: #397ca8;

    font-size: 0.9rem;
    font-weight: bold;

    cursor: pointer;

    transition: 
    transform 0.2s ease,
    background 0.2s ease;
}

.why-button:hover{
    transform: translateY(-2px);

    background: rgba(255, 255, 255, 0.95);
}

.why-button:active{
    transform: scale(0.96);
}

.song-reason{
    max-height: 0;
    overflow: hidden;

    opacity: 0;

    transition: 
    max-height 0.5s ease,
    opacity 0.4s ease,
    margin-top 0.5s ease;
}

.reason-visible{
    max-height: 300px;

    margin-top: 22px;

    opacity: 1;
}

.song-reason p{
    margin: 0 0 15px;

    color: #4f7189;

    font-size: 1rem;
    line-height: 1.8;
}

.song-reason p:last-child{
    margin-bottom: 0;
}