body {
    background-color: #121212;
    color: #FFFFFF;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    overflow: hidden;
    height: 100vh;
    width: 100vw;
    margin: 0;
}

.app-container {
    height: 100vh;
    width: 100%;
    max-width: 480px; /* Mobile-first constraint */
    margin: 0 auto;
    position: relative;
    overflow: hidden;
    border-left: 1px solid #1F1F1F;
    border-right: 1px solid #1F1F1F;
}

.video-feed {
    height: 100%;
    width: 100%;
    scroll-snap-type: y mandatory;
    overflow-y: scroll;
    overflow-x: hidden;
    -ms-overflow-style: none;  /* IE and Edge */
    scrollbar-width: none;  /* Firefox */
}

.video-feed::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

.video-slide {
    height: 100%;
    width: 100%;
    scroll-snap-align: start;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-slide video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-overlay {
    position: absolute;
    bottom: 70px; /* Above bottom nav */
    left: 0;
    width: 100%;
    padding: 16px;
    background: linear-gradient(to top, rgba(0,0,0,0.7), rgba(0,0,0,0));
    color: #fff;
}

.video-overlay .username {
    font-weight: 700;
    font-size: 1rem;
}

.video-overlay .caption {
    font-size: 0.9rem;
    margin-top: 4px;
}

.video-actions {
    position: absolute;
    bottom: 90px;
    right: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.video-actions .action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: #fff;
    text-decoration: none;
    font-size: 0.8rem;
}

.video-actions .action-btn i {
    font-size: 2rem;
}

.video-actions .action-btn .bi-heart-fill {
    color: #FF3B6C;
}

.bottom-nav {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 60px;
    background-color: #000000;
    border-top: 1px solid #1F1F1F;
    display: flex;
    justify-content: space-around;
    align-items: center;
}

.bottom-nav .nav-item {
    color: #fff;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    font-size: 0.7rem;
    opacity: 0.7;
}

.bottom-nav .nav-item.active {
    opacity: 1;
    font-weight: 600;
}

.bottom-nav .nav-item i {
    font-size: 1.5rem;
    margin-bottom: 2px;
}

.bottom-nav .upload-btn i {
    font-size: 2.2rem;
    color: #FF3B6C;
}