body {
    font-family: 'Inter', sans-serif;
    background-color: #0f172a;
}
.hero-bg {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('https://plus.unsplash.com/premium_photo-1679830513880-67584d7327e2?w=600&auto=format&fit=crop&q=60&ixlib=rb-4.1.0&ixid=M3wxMjA3fDB8MHxzZWFyY2h8MXx8dHJpcCUyMHBsYW5uZXIlMjBiYWNrZ3JvdW5kJTIwc29tdGhpbmclMjBkYXJrfGVufDB8fDB8fHww');
    background-size: cover;
    background-position: center;
}
.glassmorphism {
    background: rgba(30, 41, 59, 0.5);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}
.page { display: none; }
.page.active { display: block; }
.nav-btn.active { background-color: #06b6d4; color: white; }
.mood-image {
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
}
.mood-image:hover { transform: scale(1.05); }
.mood-image.selected::after {
    content: '✔';
    position: absolute;
    top: 8px; right: 8px;
    background-color: #06b6d4; color: white;
    border-radius: 50%;
    width: 24px; height: 24px;
    display: flex; align-items: center; justify-content: center;
    font-size: 14px;
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.7);
}
.mood-image .overlay {
    transition: background-color 0.3s;
}
.mood-image:hover .overlay {
    background-color: rgba(0,0,0,0.6);
}
.mood-image.selected .overlay {
    background-color: rgba(6, 182, 212, 0.5);
}
#smart-notification {
    transition: transform 0.5s ease-in-out;
    transform: translateY(200%);
}
#smart-notification.show {
    transform: translateY(0);
}
.iti-tab-btn.active {
    background-color: #06b6d4;
    color: white;
}
.iti-tab-btn {
    background-color: rgba(55, 65, 81, 0.5);
}
.activity-item {
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
}
.activity-item:hover {
    background-color: rgba(55, 65, 81, 0.7);
}
@keyframes plane-fly {
    0% { transform: translateX(-150px) translateY(40px) rotate(-20deg); }
    100% { transform: translateX(150px) translateY(-40px) rotate(10deg); }
}
.plane-animation {
    animation: plane-fly 4s ease-in-out infinite alternate;
}