:root {
    --primary: #2c5aa0;
    --primary-dark: #1e3f73;
    --secondary: #6c757d;
    --accent: #3a86ff;
    --success: #4bb543;
    --warning: #ff9800;
    --error: #f44336;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --light-gray: #e9ecef;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    --box-shadow-hover: 0 15px 35px rgba(0, 0, 0, 0.12);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e9f2 100%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 30px 20px;
    color: var(--dark);
    line-height: 1.6;
}

.app-container {
    max-width: 1200px;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 30px;
}

header {
    grid-column: 1 / -1;
    text-align: center;
    margin-bottom: 30px;
    padding: 0 15px;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 15px;
}

.logo i {
    font-size: 2.8rem;
    color: var(--primary);
}

h1 {
    font-size: 2.6rem;
    color: var(--primary-dark);
    font-weight: 700;
    letter-spacing: -0.5px;
}

.subtitle {
    color: var(--gray);
    font-size: 1.15rem;
    max-width: 700px;
    margin: 0 auto 30px;
    font-weight: 400;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-hover);
}

.card-header {
    padding: 20px 25px;
    border-bottom: 1px solid var(--light-gray);
    font-weight: 600;
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.1rem;
    background: linear-gradient(to bottom, #f9fafb, #f1f3f5);
}

.card-body {
    padding: 30px;
}

.upload-area {
    border: 2px dashed #d1d8e0;
    border-radius: var(--border-radius-sm);
    padding: 50px 20px;
    text-align: center;
    transition: var(--transition);
    background: #fafbff;
    cursor: pointer;
    position: relative;
}

.upload-area.active {
    border-color: var(--primary);
    background: rgba(44, 90, 160, 0.03);
}

.upload-icon {
    font-size: 3.8rem;
    color: var(--primary);
    margin-bottom: 20px;
    opacity: 0.8;
}

.upload-text {
    margin-bottom: 25px;
    color: var(--gray);
    font-size: 1.1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: var(--primary);
    color: white;
    border: none;
    padding: 14px 28px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 4px 6px rgba(44, 90, 160, 0.15);
}

.btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(44, 90, 160, 0.2);
}

.btn:active {
    transform: translateY(0);
}

.btn:disabled {
    background: #bdc3c7;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-primary {
    background: var(--primary);
}

.btn-success {
    background: var(--success);
    box-shadow: 0 4px 6px rgba(75, 181, 67, 0.15);
}

.btn-success:hover {
    background: #3f9c38;
    box-shadow: 0 6px 12px rgba(75, 181, 67, 0.2);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.1rem;
}

.btn-full {
    width: 100%;
}

.file-input {
    display: none;
}

.preview-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 20px;
    margin: 25px 0;
}

.preview-item {
    position: relative;
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    background: white;
    border: 1px solid #eee;
}

.preview-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.preview-item img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    display: block;
}

.preview-item .remove-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(231, 76, 60, 0.9);
    color: white;
    border: none;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    line-height: 1;
    transition: var(--transition);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.preview-item .remove-btn:hover {
    background: rgba(192, 57, 43, 1);
    transform: scale(1.1);
}

.settings-panel {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.settings-group {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.settings-content {
    padding: 25px;
}

.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: var(--dark);
    font-size: 0.95rem;
}

.form-control {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid #d1d8e0;
    border-radius: var(--border-radius-sm);
    font-size: 15px;
    transition: var(--transition);
    background: white;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(44, 90, 160, 0.15);
}

.range-value {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
    font-size: 0.9rem;
}

.range-value span {
    font-weight: 600;
    color: var(--primary);
}

input[type="range"] {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    background: #e9ecef;
    border-radius: 5px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--primary);
}

.checkbox-group label {
    margin: 0;
    cursor: pointer;
}

.actions {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.status {
    padding: 18px;
    border-radius: var(--border-radius-sm);
    margin: 25px 0;
    text-align: center;
    font-weight: 500;
    font-size: 1rem;
}

.status.success {
    background: rgba(75, 181, 67, 0.1);
    color: #3f9c38;
    border: 1px solid rgba(75, 181, 67, 0.2);
}

.status.error {
    background: rgba(244, 67, 54, 0.1);
    color: #d32f2f;
    border: 1px solid rgba(244, 67, 54, 0.2);
}

.loading {
    display: none;
    text-align: center;
    margin: 25px 0;
}

.spinner {
    width: 55px;
    height: 55px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

.loading p {
    color: var(--gray);
    font-weight: 500;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

footer {
    margin-top: 50px;
    text-align: center;
    color: var(--gray);
    font-size: 0.95rem;
    grid-column: 1 / -1;
    padding: 20px 0;
    border-top: 1px solid var(--light-gray);
}

.image-counter {
    background: var(--primary);
    color: white;
    border-radius: 50%;
    width: 26px;
    height: 26px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    margin-left: 10px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    margin-bottom: 20px;
    color: var(--gray);
}

.breadcrumb a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb i {
    font-size: 0.7rem;
    opacity: 0.6;
}

.feature-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin: 20px 0 30px;
}

.badge {
    background: rgba(44, 90, 160, 0.1);
    color: var(--primary);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

@media (max-width: 992px) {
    .app-container {
        grid-template-columns: 1fr;
    }
    
    .preview-container {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 2.2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .card-body {
        padding: 20px;
    }
    
    .upload-area {
        padding: 30px 15px;
    }
    
    .preview-container {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 15px;
    }
    
    .preview-item img {
        height: 140px;
    }
    
    .settings-content {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.9rem;
    }
    
    .logo i {
        font-size: 2.2rem;
    }
    
    .upload-icon {
        font-size: 3rem;
    }
    
    .preview-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .btn {
        padding: 12px 20px;
        font-size: 15px;
    }
}