* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

:root {
    --primary-color: #ff4757;
    --secondary-color: #ff6b6b;
    --accent-color: #ff8fa3;
    --bg-gradient: linear-gradient(135deg, #ff6b9d 0%, #c94b6e 50%, #d88edd 100%);
    --glass-bg: rgba(255, 255, 255, 0.25);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    --text-color: #2d3436;
}

html,
body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: 'Poppins', sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(-45deg, #f76186, #ffb199, #fa7cd8, #bd6bf4);
    background-size: 400% 400%;
    animation: romanticGradient 12s ease infinite;
    color: var(--text-color);
    overscroll-behavior: none;
    touch-action: none;
}

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

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

@keyframes float {
    0% {
        transform: translateY(110vh) rotate(0deg) scale(0.8);
        opacity: 0;
    }

    10% {
        opacity: 1;
    }

    90% {
        opacity: 1;
    }

    100% {
        transform: translateY(-20vh) rotate(360deg) scale(1.2);
        opacity: 0;
    }
}

@keyframes popIn {
    from {
        transform: scale(0.8) translateY(20px);
        opacity: 0;
    }

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

@keyframes heartbeat {
    0% {
        transform: scale(1);
    }

    14% {
        transform: scale(1.1);
    }

    28% {
        transform: scale(1);
    }

    42% {
        transform: scale(1.1);
    }

    70% {
        transform: scale(1);
    }
}

@keyframes pulse-ring {
    0% {
        box-shadow: 0 0 0 0 rgba(255, 71, 87, 0.4);
    }

    70% {
        box-shadow: 0 0 0 20px rgba(255, 71, 87, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(255, 71, 87, 0);
    }
}

.background-animation {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.floating-heart {
    position: absolute;
    color: rgba(255, 255, 255, 0.9);
    animation: float linear infinite;
    user-select: none;
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.8);
    font-size: 2rem;
}

.card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    padding: 2rem 3rem;
    border-radius: 24px;
    box-shadow: var(--glass-shadow);
    text-align: center;
    max-width: 450px;
    width: 90%;
    position: relative;
    z-index: 10;
    animation: popIn 1s cubic-bezier(0.19, 1, 0.22, 1);
    touch-action: none;
    user-select: none;
}

.heart-icon {
    font-size: 5rem;
    margin-bottom: 1.5rem;
    animation: heartbeat 1.5s ease-in-out infinite both;
    filter: drop-shadow(0 0 15px rgba(255, 71, 87, 0.4));
}

h1 {
    font-family: 'Dancing Script', cursive;
    color: var(--primary-color);
    font-size: 3.2rem;
    margin: 0 0 0.5rem;
    letter-spacing: 1px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

#valentineName {
    font-family: 'Dancing Script', cursive;
    font-size: 3.8rem;
    margin: 1rem 0;
    line-height: 1.2;
    background: linear-gradient(45deg, var(--primary-color), #ff9a9e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.message {
    color: var(--text-color);
    line-height: 1.8;
    font-size: 1.1rem;
}

.love-note {
    font-size: 1.25rem;
    margin: 2rem 0;
    color: #4a4a4a;
    font-weight: 500;
}

.signature {
    font-weight: 600;
    color: var(--primary-color);
    margin-top: 2.5rem;
    font-size: 1.4rem;
    font-family: 'Dancing Script', cursive;
}

.music-control {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 100;
}

#musicBtn {
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
    color: var(--primary-color);
    cursor: pointer;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: flex;
    align-items: center;
    justify-content: center;
}

#musicBtn:hover {
    transform: scale(1.15) rotate(15deg);
    background: rgba(255, 255, 255, 0.8);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.25);
}

#musicBtn.playing {
    animation: pulse-ring 2s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
    background: rgba(255, 255, 255, 0.9);
}

@media (max-width: 480px) {
    .card {
        padding: 2rem 1.25rem;
        width: 85%;
        margin: 1rem auto;
        max-width: none;
        left: 0;
        right: 0;
    }

    h1 {
        font-size: 2.2rem;
        margin-bottom: 0.5rem;
    }

    #valentineName {
        font-size: 2.8rem;
        line-height: 1.1;
    }

    .love-note {
        font-size: 1rem;
        margin: 1.5rem 0;
    }

    .signature {
        font-size: 1.2rem;
        margin-top: 2rem;
    }

    .music-control {
        top: 10px;
        right: 10px;
    }

    #musicBtn {
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }
}

@media (max-width: 350px) {
    h1 {
        font-size: 1.8rem;
    }

    #valentineName {
        font-size: 2.2rem;
    }

    .card {
        padding: 2rem 1rem;
    }
}