/**
 * Main Stylesheet
 * Multi-Tool Platform
 */

:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --border-color: #dee2e6;
    --text-color: #212529;
    --bg-color: #ffffff;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 6px rgba(0,0,0,0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* Header */
.header {
    background-color: var(--bg-color);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
}

.logo {
    margin: 0;
}

.logo a {
    text-decoration: none;
    color: var(--primary-color);
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.main-nav {
    display: flex;
}

.nav-list {
    list-style: none;
    display: flex;
    gap: 0.5rem;
    margin: 0;
    padding: 0;
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-size: 0.95rem;
}

.nav-link:hover {
    background-color: var(--light-color);
    color: var(--primary-color);
}

.nav-link.active {
    background-color: var(--primary-color);
    color: white;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem 0;
}

/* Home Page */
.hero-section {
    text-align: center;
    padding: 2rem 0 1.5rem;
    margin-bottom: 1.5rem;
}

.hero-section h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--dark-color);
    font-weight: 600;
}

.subtitle {
    font-size: 1rem;
    color: var(--secondary-color);
    margin: 0;
}

/* Search and Filter */
.search-filter-section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.search-box {
    position: relative;
    margin-bottom: 1rem;
}

.search-input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.search-icon {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    pointer-events: none;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.filter-btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--border-color);
    background: var(--bg-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    font-weight: 500;
}

.filter-btn:hover {
    border-color: var(--primary-color);
    background: var(--light-color);
}

.filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.category-section {
    margin-bottom: 2rem;
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.category-title {
    font-size: 0.85rem;
    color: var(--dark-color);
    font-weight: 600;
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.category-icon {
    display: none;
}

.category-count {
    font-size: 0.75rem;
    color: var(--secondary-color);
    background: var(--light-color);
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
}

.tools-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
}

.tool-card {
    background: var(--bg-color);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    text-align: center;
    display: flex;
    flex-direction: column;
    height: 100%;
    cursor: pointer;
}

.tool-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(0, 123, 255, 0.1);
    transform: translateY(-2px);
}

.tool-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
    line-height: 1;
}

.tool-name {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--dark-color);
    font-weight: 600;
    flex-grow: 0;
}

.tool-description {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-size: 0.85rem;
    line-height: 1.4;
    flex-grow: 1;
}

.tool-card .btn {
    margin-top: auto;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.no-results {
    text-align: center;
    padding: 3rem;
    color: var(--secondary-color);
    font-size: 1.1rem;
}

.category-section.hidden {
    display: none;
}

.tool-card.hidden {
    display: none;
}

/* Responsive */
@media (max-width: 768px) {
    .tools-list {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 0.75rem;
    }
    
    .hero-section h1 {
        font-size: 1.75rem;
    }
    
    .category-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }
    
    .filter-buttons {
        justify-content: flex-start;
    }
    
    .search-filter-section {
        padding: 0.75rem;
    }
    
    .tool-card {
        padding: 1rem;
    }
    
    .tool-icon {
        font-size: 1.75rem;
    }
}

/* Tool Page */
.tool-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.tool-icon-large {
    font-size: 4rem;
}

.tool-info h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.tool-workspace {
    background: var(--bg-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

/* Upload Area */
.upload-section {
    margin-bottom: 2rem;
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background-color: var(--light-color);
}

.upload-area:hover,
.upload-area.drag-over {
    border-color: var(--primary-color);
    background-color: rgba(0, 123, 255, 0.05);
}

.upload-area.uploading {
    opacity: 0.6;
    pointer-events: none;
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.upload-text {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.upload-hint {
    color: var(--secondary-color);
    font-size: 0.9rem;
}

.uploaded-files {
    margin-top: 1.5rem;
    padding: 1rem;
    background-color: var(--light-color);
    border-radius: var(--border-radius);
}

.uploaded-files h4 {
    margin-bottom: 1rem;
}

.uploaded-files ul {
    list-style: none;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--bg-color);
    margin-bottom: 0.5rem;
    border-radius: var(--border-radius);
}

.file-name {
    flex: 1;
    margin-right: 1rem;
}

.file-size {
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-right: 1rem;
}

.btn-remove {
    background: var(--danger-color);
    color: white;
    border: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
    transition: var(--transition);
}

.btn-remove:hover {
    background: #c82333;
}

/* Tool Form */
.tool-form-section {
    margin-bottom: 2rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-color);
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    cursor: pointer;
}

.form-hint {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: var(--secondary-color);
}

.info-box {
    margin-top: 1.5rem;
    padding: 1rem;
    background-color: #e7f3ff;
    border-left: 4px solid var(--info-color);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
}

.info-box strong {
    color: var(--dark-color);
}

.info-box ul {
    margin-top: 0.5rem;
    margin-left: 1.5rem;
}

.info-box li {
    margin-bottom: 0.25rem;
}

/* Loading indicator */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

.progress-indicator {
    margin: 1rem 0;
    padding: 1rem;
    background-color: var(--light-color);
    border-radius: var(--border-radius);
}

.progress-bar {
    width: 100%;
    height: 20px;
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    margin: 1rem 0;
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.75rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: #0056b3;
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-download {
    background-color: var(--success-color);
    color: white;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.btn-download:hover {
    background-color: #218838;
}

/* Tool Actions */
.tool-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

/* Results */
.results-section {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: var(--light-color);
    border-radius: var(--border-radius);
}

.results-section h4 {
    margin-bottom: 1rem;
}

.result-message {
    padding: 1rem;
    background-color: var(--success-color);
    color: white;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
}

.result-files {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.result-file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--bg-color);
    border-radius: var(--border-radius);
}

/* Footer */
.footer {
    background-color: var(--dark-color);
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 3rem;
}

/* Error Page */
.error-page {
    text-align: center;
    padding: 4rem 0;
}

.error-page h1 {
    font-size: 6rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.error-page p {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--secondary-color);
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .main-nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .tools-list {
        grid-template-columns: 1fr;
    }
    
    .tool-header {
        flex-direction: column;
        text-align: center;
    }
    
    .tool-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}