/* ========================================
   PDF Power Suite - Professional Styling
   ======================================== */

/* ========================================
   CSS Reset & Base Styles
   ======================================== */

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

:root {
    /* Color Palette */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #dbeafe;
    --accent-color: #f59e0b;
    
    /* Neutrals */
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --background: #ffffff;
    --surface: #f9fafb;
    --surface-elevated: #ffffff;
    --border: #e5e7eb;
    --border-light: #f3f4f6;
    
    /* Status Colors */
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    
    /* Spacing Scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    background-color: var(--surface);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ========================================
   Header Styles
   ======================================== */

.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    padding: var(--space-2xl) 0;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
    opacity: 0.1;
}

.header-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.header-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
}

.header-title svg {
    width: 2.5rem;
    height: 2.5rem;
}

.header-subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    font-weight: 300;
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   Main Layout
   ======================================== */

.main {
    padding: var(--space-2xl) 0;
    min-height: calc(100vh - 200px);
}

.tool-nav {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-sm);
    margin-bottom: var(--space-2xl);
    background: var(--surface-elevated);
    padding: var(--space-sm);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.tool-tab {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-lg);
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    overflow: hidden;
}

.tool-tab::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary-light);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.tool-tab:hover::before {
    opacity: 0.5;
}

.tool-tab.active::before {
    opacity: 1;
}

.tool-tab:hover,
.tool-tab.active {
    color: var(--primary-color);
    transform: translateY(-1px);
}

.tool-tab svg {
    width: 1.25rem;
    height: 1.25rem;
    position: relative;
    z-index: 1;
}

.tool-tab span {
    position: relative;
    z-index: 1;
}

/* ========================================
   Application Layout
   ======================================== */

.app-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: start;
}

/* ========================================
   File Section
   ======================================== */

.file-section {
    position: sticky;
    top: var(--space-lg);
}

.file-dropzone {
    position: relative;
    border: 2px dashed var(--border);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    text-align: center;
    transition: all var(--transition-normal);
    background: var(--surface-elevated);
    cursor: pointer;
    overflow: hidden;
}

.file-dropzone:hover {
    border-color: var(--primary-color);
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.file-dropzone.dragover {
    border-color: var(--primary-color);
    background: var(--primary-light);
    transform: scale(1.02);
}

.dropzone-content {
    position: relative;
    z-index: 2;
}

.dropzone-icon {
    width: 3rem;
    height: 3rem;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

.dropzone-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.dropzone-subtitle {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.dropzone-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(37, 99, 235, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
    border-radius: var(--radius-xl);
}

.file-dropzone.dragover .dropzone-overlay {
    opacity: 1;
}

.dropzone-overlay-content {
    color: white;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.overlay-icon {
    width: 2rem;
    height: 2rem;
}

/* File Info Card */
.file-info-card {
    margin-top: var(--space-lg);
    background: var(--surface-elevated);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.file-info-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.file-icon {
    width: 2rem;
    height: 2rem;
    color: var(--primary-color);
    flex-shrink: 0;
}

.file-details {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-weight: 600;
    margin-bottom: var(--space-xs);
    word-break: break-word;
}

.file-meta {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.file-remove {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--space-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.file-remove:hover {
    color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

.file-info-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-light);
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--primary-color);
}

.stat-label {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: var(--space-xs);
}

/* ========================================
   Configuration Section
   ======================================== */

.config-section {
    background: var(--surface-elevated);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
    overflow: hidden;
}

.tool-panel {
    display: none;
    padding: var(--space-2xl);
}

.tool-panel.active {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.panel-header {
    margin-bottom: var(--space-2xl);
    text-align: center;
}

.panel-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.panel-description {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
}

.config-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.config-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.config-group.full-width {
    grid-column: 1 / -1;
}

.config-label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    letter-spacing: 0.025em;
}

/* Form Controls */
.config-input,
.config-select {
    padding: var(--space-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
    background: var(--background);
    font-family: var(--font-family);
}

.config-input:focus,
.config-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.config-range {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border-light);
    outline: none;
    cursor: pointer;
}

.config-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.config-range::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

.config-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
}

.config-color {
    width: 60px;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.config-color:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

/* Radio Groups */
.radio-group {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.radio-option {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.radio-option:hover {
    background: var(--surface);
}

.radio-option input[type="radio"] {
    display: none;
}

.radio-indicator {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: 50%;
    position: relative;
    transition: all var(--transition-fast);
}

.radio-option input[type="radio"]:checked + .radio-indicator {
    border-color: var(--primary-color);
}

.radio-indicator::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
    transform: translate(-50%, -50%) scale(0);
    transition: transform var(--transition-fast);
}

.radio-option input[type="radio"]:checked + .radio-indicator::after {
    transform: translate(-50%, -50%) scale(1);
}

/* Checkbox Groups */
.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
}

.checkbox-option {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.checkbox-option:hover {
    background: var(--surface);
}

.checkbox-option input[type="checkbox"] {
    display: none;
}

.checkbox-indicator {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    position: relative;
    transition: all var(--transition-fast);
}

.checkbox-option input[type="checkbox"]:checked + .checkbox-indicator {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-indicator::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: translate(-50%, -60%) rotate(45deg) scale(0);
    transition: transform var(--transition-fast);
}

.checkbox-option input[type="checkbox"]:checked + .checkbox-indicator::after {
    transform: translate(-50%, -60%) rotate(45deg) scale(1);
}

/* File Input Styling */
.file-input-wrapper {
    position: relative;
}

.file-input-wrapper .file-input {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.file-input-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--background);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 500;
}

.file-input-label:hover {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

.file-input-label svg {
    width: 1.25rem;
    height: 1.25rem;
}

/* ========================================
   Process Button
   ======================================== */

.process-btn {
    width: 100%;
    padding: var(--space-lg) var(--space-xl);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    position: relative;
    overflow: hidden;
}

.process-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.process-btn:hover::before {
    left: 100%;
}

.process-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

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

.process-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.process-btn:disabled::before {
    display: none;
}

.process-btn.processing {
    background: var(--text-muted);
    cursor: not-allowed;
}

.process-btn svg {
    width: 1.25rem;
    height: 1.25rem;
}

/* ========================================
   Toast Notifications
   ======================================== */

.toast-container {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.toast {
    background: var(--surface-elevated);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border);
    min-width: 300px;
    max-width: 400px;
    transform: translateX(100%);
    animation: slideInRight 0.3s ease-out forwards;
    position: relative;
    overflow: hidden;
}

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left: 4px solid var(--error);
}

.toast.warning {
    border-left: 4px solid var(--warning);
}

@keyframes slideInRight {
    to {
        transform: translateX(0);
    }
}

.toast-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.toast-icon {
    width: 1.25rem;
    height: 1.25rem;
}

.toast.success .toast-icon {
    color: var(--success);
}

.toast.error .toast-icon {
    color: var(--error);
}

.toast.warning .toast-icon {
    color: var(--warning);
}

.toast-title {
    font-weight: 600;
    flex: 1;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--space-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.toast-close:hover {
    background: var(--surface);
}

.toast-message {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.5;
}

.toast-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background: var(--primary-color);
    animation: progressBar 5s linear forwards;
}

@keyframes progressBar {
    from {
        width: 100%;
    }
    to {
        width: 0%;
    }
}

/* ========================================
   Loading Overlay
   ======================================== */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-content {
    background: var(--surface-elevated);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    text-align: center;
    box-shadow: var(--shadow-xl);
    max-width: 400px;
    margin: var(--space-lg);
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--border-light);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-lg);
}

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

.loading-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.loading-message {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 1024px) {
    .app-layout {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .file-section {
        position: static;
    }
    
    .config-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-md);
    }
    
    .header {
        padding: var(--space-xl) 0;
    }
    
    .header-title {
        font-size: var(--font-size-2xl);
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .header-title svg {
        width: 2rem;
        height: 2rem;
    }
    
    .header-subtitle {
        font-size: var(--font-size-base);
    }
    
    .tool-nav {
        grid-template-columns: 1fr;
        gap: var(--space-xs);
    }
    
    .tool-tab {
        padding: var(--space-md);
        font-size: var(--font-size-sm);
    }
    
    .main {
        padding: var(--space-xl) 0;
    }
    
    .tool-panel {
        padding: var(--space-lg);
    }
    
    .panel-title {
        font-size: var(--font-size-xl);
    }
    
    .file-dropzone {
        padding: var(--space-xl);
    }
    
    .dropzone-title {
        font-size: var(--font-size-lg);
    }
    
    .process-btn {
        padding: var(--space-md) var(--space-lg);
        font-size: var(--font-size-base);
    }
    
    .radio-group {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .checkbox-grid {
        grid-template-columns: 1fr;
    }
    
    .toast-container {
        top: var(--space-sm);
        right: var(--space-sm);
        left: var(--space-sm);
    }
    
    .toast {
        min-width: auto;
        max-width: none;
    }
    
    /* Mobile-responsive disclaimer boxes */
    .panel-header > div[style*="background"] {
        padding: 12px !important;
        margin: 12px 0 !important;
        font-size: 12px !important;
        border-radius: 6px !important;
    }
    
    .panel-header > div[style*="background"] h4 {
        font-size: 14px !important;
        margin-bottom: 6px !important;
    }
    
    .panel-header > div[style*="background"] p {
        font-size: 12px !important;
        line-height: 1.3 !important;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-sm);
    }
    
    .header-title {
        font-size: var(--font-size-xl);
    }
    
    .header-subtitle {
        font-size: var(--font-size-sm);
    }
    
    .config-grid {
        gap: var(--space-md);
    }
    
    .file-dropzone {
        padding: var(--space-lg);
    }
    
    .dropzone-icon {
        width: 2rem;
        height: 2rem;
    }
    
    .loading-content {
        padding: var(--space-lg);
        margin: var(--space-sm);
    }
}

/* ========================================
   High Contrast & Accessibility
   ======================================== */

@media (prefers-contrast: high) {
    :root {
        --border: #000000;
        --text-secondary: #000000;
        --text-muted: #333333;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .header,
    .toast-container,
    .loading-overlay {
        display: none !important;
    }
    
    .main {
        padding: 0;
    }
    
    .app-layout {
        grid-template-columns: 1fr;
    }
}