/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-color-rgb: 37, 99, 235;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --primary-surface: rgba(var(--primary-color-rgb), 0.12);
    --primary-faint: rgba(var(--primary-color-rgb), 0.06);
    --primary-ring: rgba(var(--primary-color-rgb), 0.2);
    --primary-shadow: rgba(var(--primary-color-rgb), 0.25);
    --accent-gradient: linear-gradient(135deg, #7dd3fc 0%, #2563eb 100%);
    --glow-color: rgba(var(--primary-color-rgb), 0.2);
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    
    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    
    /* Border Colors */
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --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;
    
    /* Layout */
    --sidebar-width: 280px;
    --header-height: 64px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Dark Mode Variables - IT-Tools inspired color scheme */
[data-theme="dark"] {
    /* Color Palette - vibrant green accent like IT-Tools */
    --primary-color: #18a058;
    --primary-color-rgb: 24, 160, 88;
    --primary-hover: #3b956f;
    --secondary-color: #a1a1a1;
    --success-color: #14a058;
    --error-color: #ff8a8a;
    --warning-color: #fbbf24;
    
    /* Background Colors - dark slate like IT-Tools */
    --bg-primary: #141414;
    --bg-secondary: #080808;
    --bg-tertiary: #1f1f1f;
    
    /* Text Colors - light slate like IT-Tools */
    --text-primary: #f5f5f5;
    --text-secondary: #c8c8c8;
    --text-muted: #838587;
    
    /* Border Colors - dark slate like IT-Tools */
    --border-color: #232323;
    --border-hover: #333333;

    /* Accent helpers */
    --primary-surface: rgba(var(--primary-color-rgb), 0.28);
    --primary-faint: rgba(var(--primary-color-rgb), 0.12);
    --primary-ring: rgba(var(--primary-color-rgb), 0.45);
    --primary-shadow: rgba(var(--primary-color-rgb), 0.5);
    --accent-gradient: linear-gradient(130deg, #25636c 0%, #3b956f 55%, #14a058 100%);
    --glow-color: rgba(var(--primary-color-rgb), 0.4);
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    line-height: 1.6;
}

/* Global textarea styles - make all textareas default to full width of container */
textarea {
    width: 100%;
    box-sizing: border-box;
}

html[data-theme="dark"] body {
    background-color: #050505;
    background-image:
        radial-gradient(circle at 20% 20%, rgba(var(--primary-color-rgb), 0.18), transparent 45%),
        radial-gradient(circle at 80% 0%, rgba(37, 99, 108, 0.35), transparent 52%),
        linear-gradient(180deg, #050505 0%, #080808 100%);
    background-attachment: fixed;
    color: var(--text-primary);
}

/* App Container */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
    transition: transform var(--transition-base);
}

html[data-theme="dark"] .sidebar {
    background: rgba(8, 8, 8, 0.92);
    border-right: 1px solid rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(18px);
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

[data-theme="dark"] .sidebar-header {
    background: var(--accent-gradient);
    border-bottom: none;
    box-shadow: 0 15px 35px var(--primary-shadow);
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

[data-theme="dark"] .logo {
    color: white;
}

.sidebar-nav {
    padding: var(--spacing-md);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 50;
}

html[data-theme="dark"] .main-header {
    background: rgba(10, 10, 10, 0.85);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(16px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.6);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.sidebar-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.sidebar-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition-base);
}

.page-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.content-area {
    flex: 1;
    padding: var(--spacing-xl);
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
}

/* Home Page */
.home-page {
    animation: fadeIn var(--transition-base);
}

.hero-section {
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.hero-section h1 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.tool-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    color: inherit;
    display: block;
    position: relative;
    overflow: hidden;
}

.tool-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(var(--primary-color-rgb), 0.15);
    transform: translateY(-2px);
}

.tool-card-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.tool-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
}

.tool-card p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

html[data-theme="dark"] .tool-card {
    border: 1px solid transparent;
    background-image: linear-gradient(var(--bg-primary), var(--bg-primary)), var(--accent-gradient);
    background-origin: border-box;
    background-clip: padding-box, border-box;
    box-shadow: 0 25px 45px rgba(0, 0, 0, 0.65);
}

html[data-theme="dark"] .tool-card:hover {
    box-shadow: 0 35px 65px var(--primary-shadow);
    transform: translateY(-4px);
}

html[data-theme="dark"] .tool-card-icon {
    color: var(--primary-color);
    text-shadow: 0 0 30px var(--glow-color);
}

html[data-theme="dark"] .tool-card p {
    color: rgba(255, 255, 255, 0.75);
}

.features-section {
    margin-top: var(--spacing-2xl);
}

.features-section h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    font-size: var(--font-size-2xl);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-xl);
    text-align: center;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-lg);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* Tool Page */
.tool-page {
    animation: fadeIn var(--transition-base);
}

.tool-header {
    margin-bottom: var(--spacing-xl);
}

.tool-header h1 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
}

.tool-container {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-xl);
}

.upload-section {
    margin-bottom: var(--spacing-xl);
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--bg-secondary);
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: var(--bg-tertiary);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(var(--primary-color-rgb), 0.05);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.upload-content h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.upload-content p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.file-list {
    margin-top: var(--spacing-lg);
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 4px;
    margin-bottom: var(--spacing-sm);
}

html[data-theme="dark"] .tool-container,
html[data-theme="dark"] .options-section,
html[data-theme="dark"] .progress-section,
html[data-theme="dark"] .file-item,
html[data-theme="dark"] .result-item {
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.65);
}

html[data-theme="dark"] .upload-area {
    background-color: rgba(255, 255, 255, 0.02);
    border-color: rgba(255, 255, 255, 0.12);
}

html[data-theme="dark"] .upload-area.dragover {
    background: var(--primary-faint);
}

.options-section {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: 8px;
}

.format-selector {
    margin-bottom: var(--spacing-lg);
}

.format-selector label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.format-selector select {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: var(--font-size-base);
    background: var(--bg-primary);
}

.action-section {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: 4px;
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

html[data-theme="dark"] .btn-primary {
    background-image: var(--accent-gradient);
    box-shadow: 0 18px 40px var(--primary-shadow);
    border: none;
}

html[data-theme="dark"] .btn-primary:hover:not(:disabled) {
    filter: brightness(1.05);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

html[data-theme="dark"] .btn-secondary {
    background-color: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

html[data-theme="dark"] .btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.08);
}

.progress-section {
    margin-bottom: var(--spacing-xl);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    transition: width var(--transition-base);
    width: 0%;
}

html[data-theme="dark"] .progress-fill {
    background-image: var(--accent-gradient);
    box-shadow: 0 0 15px var(--glow-color);
}

.progress-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

html[data-theme="dark"] .progress-text {
    color: rgba(255, 255, 255, 0.65);
}

.results-section {
    margin-top: var(--spacing-xl);
}

.results-section h3 {
    margin-bottom: var(--spacing-lg);
}

.error-section {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error-color);
    border-radius: 4px;
    color: var(--error-color);
}

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

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

/* Dark Mode Toggle */
.dark-mode-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
    background-color: var(--bg-secondary);
}

.dark-mode-toggle:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--border-hover);
}

.dark-mode-toggle:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--primary-ring);
}

.dark-mode-toggle-icon {
    font-size: var(--font-size-lg);
    transition: transform var(--transition-base);
}

.dark-mode-toggle[aria-pressed="true"] .dark-mode-toggle-icon {
    transform: rotate(180deg);
}

html[data-theme="dark"] .dark-mode-toggle {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.12);
    color: var(--text-primary);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04), 0 12px 28px rgba(0, 0, 0, 0.55);
}

html[data-theme="dark"] .dark-mode-toggle:hover {
    background-color: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.18);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .sidebar-toggle {
        display: flex;
    }
    
    .content-area {
        padding: var(--spacing-md);
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .tool-container {
        padding: var(--spacing-md);
    }
    
    .options-section {
        padding: var(--spacing-md);
    }
}

/* Logo Link Styling */
.logo-link {
    text-decoration: none;
    color: inherit;
    display: block;
    transition: opacity 0.2s ease;
}

.logo-link:hover {
    opacity: 0.8;
}

.logo-link .logo {
    cursor: pointer;
}