:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #9b59b6;
    --dark-bg: #1a1a2e;
    --card-bg: rgba(255, 255, 255, 0.08);
    --text-color: #e6e6e6;
    --border-color: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Segoe UI', 'Roboto', sans-serif;
    background: linear-gradient(135deg, var(--dark-bg) 0%, #16213e 100%);
    color: var(--text-color);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: 700;
}

.lang-switcher {
    position: absolute;
    top: 20px;
    right: 20px;
}

.lang-dropdown {
    position: relative;
    display: inline-block;
}

.lang-dropdown-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px 12px;
    cursor: pointer;
    font-size: 0.9rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.lang-dropdown-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-color);
}

.dropdown-arrow {
    font-size: 0.7rem;
    transition: transform 0.2s ease;
}

.lang-dropdown.open .dropdown-arrow {
    transform: rotate(180deg);
}

.lang-dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 5px 0;
    min-width: 120px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    z-index: 1000;
    margin-top: 5px;
}

.lang-dropdown.open .lang-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    background: none;
    border: none;
    color: var(--text-color);
    padding: 8px 15px;
    cursor: pointer;
    font-size: 0.9rem;
    width: 100%;
    text-align: left;
    transition: all 0.2s ease;
}

.lang-option:hover {
    background: rgba(255, 255, 255, 0.1);
}

.lang-option.active {
    background: var(--primary-color);
    color: white;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.8;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 25px;
    margin-bottom: 25px;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.upload-area {
    border: 2px dashed var(--primary-color);
    border-radius: 12px;
    padding: 40px 20px;
    text-align: center;
    margin-bottom: 20px;
    transition: all 0.3s ease;
    background: rgba(52, 152, 219, 0.05);
    position: relative;
}

.upload-area.drag-over {
    border-color: var(--accent-color);
    background: rgba(155, 89, 182, 0.2);
    box-shadow: 0 0 20px rgba(155, 89, 182, 0.4);
}

.upload-area:hover {
    border-color: var(--accent-color);
    background: rgba(155, 89, 182, 0.1);
}

.file-input {
    display: none;
}

.file-label {
    display: inline-block;
    padding: 14px 28px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.file-label:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.drag-text {
    margin-top: 15px;
    font-size: 0.9rem;
    opacity: 0.8;
}

.preview-container {
    display: flex;
    justify-content: center;
    margin: 20px 0;
}

.preview-container.hidden {
    display: none;
}

.preview-box {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    background: rgba(0, 0, 0, 0.2);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.preview-title {
    text-align: center;
    margin-bottom: 10px;
    font-weight: 500;
    color: var(--text-color);
    opacity: 0.8;
}

.preview-img {
    max-width: 120px;
    max-height: 120px;
    border-radius: 4px;
}

.size-options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 12px;
    margin: 20px 0;
}

.size-option {
    display: flex;
    align-items: center;
    padding: 10px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.size-option:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-color);
}

.size-option input {
    margin-right: 8px;
}

.select-all {
    grid-column: 1 / -1;
    padding: 12px;
    background: rgba(52, 152, 219, 0.1);
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.select-all:hover {
    background: rgba(52, 152, 219, 0.2);
}

.action-buttons {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.btn {
    flex: 1;
    padding: 16px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.923);
    color: #9b59b6;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.status-container {
    margin-top: 25px;
    padding: 20px;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
}

.progress-bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
    margin: 15px 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 4px;
    width: 0%;
    transition: width 0.3s ease;
}

.status-text {
    text-align: center;
    font-weight: 500;
}

.status-ready {
    color: var(--secondary-color);
}

.status-loading {
    color: var(--primary-color);
}

.status-error {
    color: #e74c3c;
}

.status-success {
    color: var(--secondary-color);
}

.file-info {
    text-align: center;
    margin-top: 10px;
    opacity: 0.8;
}

footer {
    text-align: center;
    margin-top: 40px;
    opacity: 0.7;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .lang-switcher {
        position: relative;
        top: auto;
        right: auto;
        margin: 10px auto;
        text-align: center;
    }
    
    .lang-dropdown-menu {
        right: auto;
        left: 50%;
        transform: translateX(-50%) translateY(-10px);
    }
    
    .lang-dropdown.open .lang-dropdown-menu {
        transform: translateX(-50%) translateY(0);
    }
    
    .size-options {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }

    .action-buttons {
        flex-direction: column;
    }

    h1 {
        font-size: 2rem;
    }
}