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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #121212;
    color: #ffffff;
    display: flex;
    min-height: 100vh;
}

/* ===== Sidebar ===== */
.sidebar {
    width: 260px;
    min-height: 100vh;
    background-color: #1a1a2e;
    border-right: 1px solid #333;
    padding: 20px 15px;
    padding-top: 65px;
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
}

.sidebar-title {
    font-size: 1.3rem;
    text-align: center;
    margin-bottom: 2rem;
    color: #e0e0e0;
    border-bottom: 1px solid #333;
    padding-bottom: 15px;
}

.category-list {
    list-style: none;
    flex: 1;
}

.category-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 12px;
    margin-bottom: 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s;
    font-size: 0.9rem;
    position: relative;
}

.category-item.active {
    background-color: #16213e;
    border: 1px solid #007bff;
    color: #ffffff;
}

.category-item.active:hover {
    background-color: #1a2745;
}

.category-item.disabled {
    background-color: #2a2a2a;
    color: #666;
    cursor: not-allowed;
    border: 1px solid #333;
}

.category-icon {
    font-size: 1.5rem;
}

.coming-soon {
    position: absolute;
    top: 5px;
    right: 8px;
    font-size: 0.6rem;
    background-color: #555;
    color: #aaa;
    padding: 2px 6px;
    border-radius: 3px;
}

/* ===== Top Bar ===== */
.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: #0d0d1a;
    border-bottom: 1px solid #333;
    padding: 10px 0;
    z-index: 100;
    text-align: center;
}

.lang-selector {
    display: flex;
    gap: 8px;
    justify-content: center;
}

.lang-selector button {
    background-color: #1e1e1e;
    color: #ffffff;
    border: 1px solid #333;
    padding: 8px 14px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
    font-size: 0.85rem;
}

.lang-selector button:hover,
.lang-selector button.active {
    background-color: #007bff;
}

/* ===== Main Content ===== */
.main-content {
    margin-left: 260px;
    flex: 1;
    padding: 30px;
    padding-top: 65px;
    text-align: center;
}

/* ===== Landing Page ===== */
.landing-page {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.landing-title {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.landing-subtitle {
    color: #aaa;
    margin-bottom: 2rem;
    font-size: 1rem;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    max-width: 800px;
    margin-bottom: 2rem;
}

.preview-item {
    border-radius: 8px;
    overflow: hidden;
    border: 2px solid #333;
    transition: border-color 0.3s, transform 0.3s;
}

.preview-item:hover {
    border-color: #007bff;
    transform: scale(1.03);
}

.preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.start-btn {
    background: linear-gradient(135deg, #007bff, #0056b3);
    color: #ffffff;
    border: none;
    padding: 15px 50px;
    border-radius: 30px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}

.start-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 20px rgba(0, 123, 255, 0.4);
}

/* ===== Tournament ===== */
#round-title {
    font-size: 2rem;
    margin-bottom: 2rem;
}

.tournament-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.image-wrapper {
    cursor: pointer;
    border: 2px solid transparent;
    transition: transform 0.3s, border-color 0.3s;
    border-radius: 10px;
    overflow: hidden;
    position: relative;
}

.image-wrapper:hover {
    transform: scale(1.05);
    border-color: #007bff;
}

.image-wrapper img {
    max-width: 400px;
    max-height: 400px;
    display: block;
}

.image-wrapper p {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.7);
    color: #fff;
    padding: 5px 10px;
    border-radius: 5px;
}

/* ===== Winner ===== */
.winner-container {
    display: none;
    flex-direction: column;
    align-items: center;
}

.winner-container img {
    max-width: 80%;
    max-height: 500px;
    margin-bottom: 1rem;
}

#feedback-form {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 500px;
}

#feedback-form h3 {
    margin-bottom: 1rem;
}

#feedback-text {
    width: 100%;
    height: 100px;
    background-color: #1e1e1e;
    color: #ffffff;
    border: 1px solid #333;
    border-radius: 5px;
    padding: 10px;
    margin-bottom: 1rem;
}

#submit-feedback {
    background-color: #007bff;
    color: #ffffff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#submit-feedback:hover {
    background-color: #0056b3;
}

#submit-feedback:disabled {
    background-color: #555;
    cursor: not-allowed;
}

.feedback-status {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    min-height: 1.2em;
}

.feedback-status.success {
    color: #4caf50;
}

.feedback-status.error {
    color: #f44336;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }
    .main-content {
        margin-left: 200px;
    }
    .preview-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .image-wrapper img {
        max-width: 250px;
        max-height: 250px;
    }
}