@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700&family=Quicksand:wght@400;500;600;700&display=swap');

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

body {
    font-family: 'Quicksand', 'Nunito', -apple-system, BlinkMacSystemFont, sans-serif;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Sfondo animato molto dinamico */
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #a8d8ea 0%, #d4f1f9 25%, #b8e6f0 50%, #c5e9f5 75%, #aad5e8 100%);
    z-index: -1;
    overflow: hidden;
}

/* Sfere gradiente che si muovono */
.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(90px);
    opacity: 0.5;
    animation: moveOrb 25s ease-in-out infinite;
}

.orb1 {
    width: 450px;
    height: 450px;
    background: radial-gradient(circle, rgba(135, 206, 235, 0.8), rgba(174, 214, 241, 0.3));
    top: -10%;
    left: -10%;
    animation-delay: 0s;
}

.orb2 {
    width: 550px;
    height: 550px;
    background: radial-gradient(circle, rgba(176, 224, 230, 0.7), rgba(193, 234, 241, 0.2));
    bottom: -15%;
    right: -15%;
    animation-delay: 8s;
}

.orb3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(158, 216, 235, 0.6), rgba(201, 237, 246, 0.2));
    top: 40%;
    left: 50%;
    animation-delay: 16s;
}

@keyframes moveOrb {
    0%, 100% {
        transform: translate(0, 0) scale(1) rotate(0deg);
    }
    25% {
        transform: translate(60px, 120px) scale(1.15) rotate(90deg);
    }
    50% {
        transform: translate(-40px, 60px) scale(0.85) rotate(180deg);
    }
    75% {
        transform: translate(80px, -60px) scale(1.08) rotate(270deg);
    }
}

/* Bolle dinamiche */
.bubble {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.6), rgba(174, 214, 241, 0.15));
    box-shadow: 0 8px 32px rgba(135, 206, 235, 0.25);
    animation: float linear infinite;
}

@keyframes float {
    0% {
        transform: translateY(100vh) scale(0) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 0.75;
    }
    90% {
        opacity: 0.75;
    }
    100% {
        transform: translateY(-120px) scale(1) rotate(360deg);
        opacity: 0;
    }
}

/* Girasoli stilizzati celeste (decorativi nello sfondo) */
.sunflower-deco {
    position: absolute;
    width: 60px;
    height: 60px;
    opacity: 0.12;
    animation: rotateSunflower 30s linear infinite;
}

.sunflower-deco::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(135, 206, 235, 0.3) 20%, transparent 20%),
                radial-gradient(circle, transparent 30%, rgba(174, 214, 241, 0.2) 30%, rgba(174, 214, 241, 0.2) 45%, transparent 45%);
    border-radius: 50%;
}

@keyframes rotateSunflower {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Container principale */
.container {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    position: relative;
}

/* Form effetto vetro con transizioni */
.glass-form {
    background: rgba(255, 255, 255, 0.78);
    backdrop-filter: blur(28px) saturate(200%);
    -webkit-backdrop-filter: blur(28px) saturate(200%);
    border-radius: 32px;
    border: 2.5px solid rgba(255, 255, 255, 0.65);
    box-shadow: 0 25px 70px rgba(135, 206, 235, 0.4),
                0 0 0 1px rgba(255, 255, 255, 0.35) inset;
    padding: 50px 40px;
    max-width: 560px;
    width: 100%;
    position: relative;
    z-index: 10;
    animation: slideIn 1s cubic-bezier(0.16, 1, 0.3, 1);
    transition: transform 0.3s ease;
}

.glass-form:hover {
    transform: translateY(-3px);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(50px) scale(0.93);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Immagine nella slide del form */
.slide-image {
    width: 100%;
    max-width: 330px;
    height: 290px;
    object-fit: cover;
    border-radius: 22px;
    margin: 0 auto 32px;
    display: block;
    box-shadow: 0 18px 45px rgba(0, 0, 0, 0.2);
    border: 4px solid rgba(255, 255, 255, 0.88);
    transition: transform 0.4s ease;
}

.slide-image:hover {
    transform: scale(1.02);
}

/* Foto fluttuanti laterali */
.floating-photo {
    position: fixed;
    width: 135px;
    height: 135px;
    object-fit: cover;
    border-radius: 20px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.28);
    border: 4px solid rgba(255, 255, 255, 0.92);
    opacity: 0;
    transition: opacity 1.2s ease;
    z-index: 5;
    pointer-events: none;
}

.floating-photo.active {
    opacity: 0.9;
    animation: floatGentle 8s ease-in-out infinite;
}

@keyframes floatGentle {
    0%, 100% {
        transform: translateY(0) rotate(-3deg);
    }
    50% {
        transform: translateY(-25px) rotate(3deg);
    }
}

.floating-photo.left {
    left: 5%;
    top: 18%;
}

.floating-photo.right {
    right: 5%;
    top: 58%;
}

/* Contenuto slide con transizioni fluide */
.slide-content {
    text-align: center;
    animation: fadeSlide 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeSlide {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-content.transitioning {
    animation: fadeOut 0.4s ease forwards;
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: translateY(-15px);
    }
}

.slide-content h2 {
    color: #4fa8d5;
    font-size: 32px;
    margin-bottom: 28px;
    font-weight: 700;
    line-height: 1.4;
    font-family: 'Nunito', sans-serif;
    letter-spacing: 0.3px;
}

.slide-content p {
    color: #2c3e50;
    font-size: 19px;
    line-height: 2;
    margin-bottom: 38px;
    white-space: pre-line;
    font-weight: 500;
    letter-spacing: 0.2px;
}

/* Bottoni con micro-animazioni */
.buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 17px 42px;
    border: none;
    border-radius: 50px;
    font-size: 19px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.16);
    -webkit-tap-highlight-color: transparent;
    font-family: 'Nunito', sans-serif;
    letter-spacing: 0.3px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn-next {
    background: linear-gradient(135deg, #a8d8ea, #5dade2);
    color: white;
}

.btn-back {
    background: linear-gradient(135deg, #e0e7ea, #bdc8ce);
    color: #34495e;
}

.btn-yes {
    background: linear-gradient(135deg, #b4ecd4, #85d8ab);
    color: white;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-no {
    background: linear-gradient(135deg, #ffc4ca, #ff9ba3);
    color: white;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Schermata finale cuore */
.heart-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, #ff9a9e 0%, #fad0c4 50%, #ffecd2 100%);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    overflow: hidden;
}

.heart-screen.active {
    display: flex;
    animation: fadeIn 2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Canvas per il cuore di particelle */
#heartCanvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* Responsive canvas */
@media (max-width: 768px) {
    #heartCanvas {
        max-width: 90vw;
        max-height: 90vh;
    }
}

@media (max-width: 480px) {
    #heartCanvas {
        max-width: 95vw;
        max-height: 80vh;
    }
}

/* Responsive per dispositivi Apple */
@media (max-width: 768px) {
    .glass-form {
        padding: 38px 28px;
        max-width: 95%;
        border-radius: 28px;
    }

    .slide-content h2 {
        font-size: 28px;
        margin-bottom: 24px;
    }

    .slide-content p {
        font-size: 18px;
        line-height: 1.9;
    }

    .btn {
        padding: 15px 36px;
        font-size: 18px;
    }

    .floating-photo {
        width: 95px;
        height: 95px;
        border-radius: 16px;
    }

    .floating-photo.left {
        left: 3%;
        top: 12%;
    }

    .floating-photo.right {
        right: 3%;
        top: 68%;
    }

    .slide-image {
        max-width: 290px;
        height: 250px;
        border-radius: 20px;
    }

    .final-message {
        font-size: 30px;
        padding: 0 20px;
    }

    .sunflower-deco {
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 480px) {
    .glass-form {
        padding: 32px 22px;
        border-radius: 26px;
    }

    .slide-content h2 {
        font-size: 26px;
        margin-bottom: 22px;
    }

    .slide-content p {
        font-size: 17px;
        line-height: 1.85;
    }

    .btn {
        padding: 14px 32px;
        font-size: 17px;
    }

    .floating-photo {
        width: 80px;
        height: 80px;
        border-radius: 14px;
    }

    .slide-image {
        max-width: 270px;
        height: 230px;
        border-radius: 18px;
    }

    .final-message {
        font-size: 26px;
    }

    .sunflower-deco {
        width: 35px;
        height: 35px;
    }
}

.hidden {
    display: none;
}