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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

nav {
    display: flex;
    gap: 1.5rem;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
}

nav a:hover {
    opacity: 0.8;
}

/* Main Content */
main {
    min-height: calc(100vh - 200px);
    padding: 2rem 0;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 0;
    background: white;
    border-radius: 10px;
    margin-bottom: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #667eea;
}

.hero p {
    font-size: 1.2rem;
    color: #666;
}

/* Videos Section */
.videos-section {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.videos-section h2 {
    margin-bottom: 1.5rem;
    color: #333;
}

.videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.video-card {
    background: #f9f9f9;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
}

.video-embed {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
}

.video-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.video-info {
    padding: 1rem;
}

.video-info h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.video-meta {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
}

.video-meta span {
    margin-right: 1rem;
}

.video-description {
    font-size: 0.9rem;
    color: #555;
    margin-top: 0.5rem;
}

.video-user {
    font-size: 0.85rem;
    color: #667eea;
    font-weight: 500;
    margin-top: 0.5rem;
}

/* Auth Section */
.auth-section {
    max-width: 500px;
    margin: 2rem auto;
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.auth-section h2 {
    margin-bottom: 1.5rem;
    text-align: center;
    color: #667eea;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #333;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
}

.form-group textarea {
    resize: vertical;
    font-family: inherit;
}

.form-group small {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.85rem;
    color: #666;
}

.security-question {
    background: #f9f9f9;
    padding: 1rem;
    border-radius: 5px;
    font-weight: 500;
    color: #333;
    margin-bottom: 1rem;
}

.btn {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 100%;
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(102, 126, 234, 0.4);
}

.auth-link {
    text-align: center;
    margin-top: 1.5rem;
    color: #666;
}

.auth-link a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
}

.auth-link a:hover {
    text-decoration: underline;
}

/* Submit Section */
.submit-section {
    max-width: 700px;
    margin: 2rem auto;
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.submit-section h2 {
    margin-bottom: 1rem;
    color: #667eea;
}

.info-text {
    color: #666;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

/* Profile Section */
.profile-section {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.profile-section h2 {
    margin-bottom: 1.5rem;
    color: #667eea;
}

.profile-section h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: #333;
}

.user-info {
    background: #f9f9f9;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.user-info p {
    margin-bottom: 0.5rem;
}

.user-info strong {
    color: #667eea;
}

/* Messages */
.error-message {
    background: #fee;
    color: #c33;
    padding: 1rem;
    border-radius: 5px;
    margin-top: 1rem;
    border-left: 4px solid #c33;
}

.success-message {
    background: #efe;
    color: #3c3;
    padding: 1rem;
    border-radius: 5px;
    margin-top: 1rem;
    border-left: 4px solid #3c3;
}

.loading {
    text-align: center;
    color: #666;
    padding: 2rem;
}

.empty-state {
    text-align: center;
    color: #999;
    padding: 3rem;
    font-style: italic;
}

/* Footer */
footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 3rem;
}

/* Responsive */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        gap: 1rem;
    }

    nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .videos-grid {
        grid-template-columns: 1fr;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }
}