:root {
    --primary-color: #4cc9f0;
    --secondary-color: #480ca8;
    --accent-color: #f72585;
    --light-bg: #f8f9fa;
    --dark-text: #212529;
}

body {
    background: linear-gradient(135deg, #f0f4ff 0%, #d9e2ff 100%);
    font-family: 'Segoe UI', sans-serif;
    min-height: 100vh;
}

.navbar {
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.navbar-brand img {
    height: 50px;
}

.main-container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    padding: 30px;
    margin-top: 40px;
}

.sidebar {
    border-right: 1px solid #dee2e6;
    padding-right: 20px;
}

.folder-item {
    padding: 15px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    background: var(--light-bg);
    margin-bottom: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.folder-item:hover {
    background: rgba(76, 201, 240, 0.1);
    transform: translateX(5px);
}

.folder-item .form-check-input {
    margin-right: 10px;
}

.video-thumbnail {
    height: 200px;
    background: #e9ecef;
    border-radius: 10px 10px 0 0;
    overflow: hidden;
    position: relative;
}

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

.play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    color: rgba(255,255,255,0.8);
    cursor: pointer;
}

.video-card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: all 0.3s;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.action-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.action-btn:hover {
    background: rgba(76, 201, 240, 0.1);
    transform: scale(1.1);
}

.login-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 30px;
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.share-link {
    background: var(--light-bg);
    padding: 10px;
    border-radius: 10px;
    word-break: break-all;
}