/**
 * Main Stylesheet - Tools.SologenX.com
 * Commercial-Grade Web Tools Platform
 * Mobile-first responsive design
 */

/* ========================================
   CSS Variables (Theme System)
======================================== */
:root {
    /* Colors - Light Theme */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #3b82f6;
    --color-secondary: #64748b;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #06b6d4;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-input: #ffffff;
    --bg-hover: #f1f5f9;
    
    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-inverse: #ffffff;
    
    /* Border Colors */
    --border-color: #e2e8f0;
    --border-focus: #2563eb;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Fira Code', 'Monaco', 'Consolas', monospace;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 300;
    --z-toast: 400;
    --z-loading: 500;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;
    --bg-input: #1e293b;
    --bg-hover: #334155;
    
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --border-color: #334155;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4);
}

/* ========================================
   Reset & Base Styles
======================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
    color: var(--color-primary-dark);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: var(--color-primary);
    color: var(--text-inverse);
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: var(--z-modal);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

/* ========================================
   Layout
======================================== */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.main {
    flex: 1;
    padding: var(--spacing-lg) 0;
}

/* ========================================
   Header
======================================== */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    gap: var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo:hover {
    color: var(--color-primary);
}

.logo-icon {
    color: var(--color-primary);
    font-size: 1.5rem;
}

.header-search {
    flex: 1;
    max-width: 400px;
    display: none;
}

@media (min-width: 768px) {
    .header-search {
        display: block;
    }
}

.search-form {
    position: relative;
    display: flex;
}

.search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: 40px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    background: var(--bg-input);
    color: var(--text-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.search-btn {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.search-btn:hover {
    color: var(--color-primary);
}

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

.theme-toggle,
.mobile-menu-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.theme-toggle:hover,
.mobile-menu-toggle:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.mobile-menu-toggle {
    display: flex;
}

@media (min-width: 1024px) {
    .mobile-menu-toggle {
        display: none;
    }
}

/* ========================================
   Navigation
======================================== */
.nav {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: none;
}

.nav.active {
    display: block;
}

@media (min-width: 768px) {
    .nav {
        display: block;
    }
}

.nav-list {
    display: flex;
    flex-direction: column;
    list-style: none;
    padding: var(--spacing-xs) 0;
    gap: 0;
}

@media (min-width: 768px) {
    .nav-list {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        padding: 0;
        gap: 0;
    }
}

.nav-item {
    flex-shrink: 0;
}

.nav-link {
    display: block;
    padding: 10px 14px;
    color: var(--text-secondary);
    font-size: 0.8125rem;
    font-weight: 500;
    white-space: nowrap;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background: rgba(37, 99, 235, 0.1);
}

/* ========================================
   Buttons
======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    text-decoration: none;
}

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

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

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

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

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

.btn-success {
    background: var(--color-success);
    color: var(--text-inverse);
}

.btn-danger {
    background: var(--color-danger);
    color: var(--text-inverse);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

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

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.75rem;
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
}

.btn-block {
    width: 100%;
}

/* ========================================
   Forms
======================================== */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input,
.form-select,
.form-textarea,
.form-control,
input[type="text"],
input[type="number"],
input[type="email"],
input[type="url"],
input[type="tel"],
input[type="password"],
input[type="search"],
input[type="date"],
input[type="time"],
input[type="datetime-local"],
select,
textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-card);
    color: var(--text-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
    font-size: 1rem;
    line-height: 1.5;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus,
.form-control:focus,
input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
    background: var(--bg-primary);
}

.form-textarea,
textarea {
    min-height: 150px;
    resize: vertical;
    font-family: var(--font-mono);
    line-height: 1.6;
}

/* Better input/textarea contrast in dark mode */
[data-theme="dark"] .form-input,
[data-theme="dark"] .form-select,
[data-theme="dark"] .form-textarea,
[data-theme="dark"] .form-control,
[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
}

[data-theme="dark"] .form-input:focus,
[data-theme="dark"] .form-select:focus,
[data-theme="dark"] .form-textarea:focus,
[data-theme="dark"] .form-control:focus,
[data-theme="dark"] input:focus,
[data-theme="dark"] select:focus,
[data-theme="dark"] textarea:focus {
    background: var(--bg-secondary);
    border-color: var(--color-primary);
}

.form-hint {
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.form-error {
    color: var(--color-danger);
}

/* Range Slider */
.form-range {
    width: 100%;
    height: 6px;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    appearance: none;
    cursor: pointer;
}

.form-range::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.form-range::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

/* ========================================
   Cards
======================================== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.card-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-body {
    padding: var(--spacing-lg);
}

.card-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

/* ========================================
   Tool Page Layout
======================================== */
.tool-page {
    display: grid;
    gap: var(--spacing-lg);
}

@media (min-width: 1024px) {
    .tool-page {
        grid-template-columns: 1fr 300px;
    }
}

.tool-main {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.tool-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

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

.tool-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

@media (min-width: 768px) {
    .tool-title {
        font-size: 2rem;
    }
}

.tool-description {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ========================================
   File Upload Area
======================================== */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    background: var(--bg-secondary);
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
    cursor: pointer;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--color-primary);
    background: rgba(37, 99, 235, 0.05);
}

.upload-area.has-files {
    border-style: solid;
    border-color: var(--color-success);
}

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

.upload-area:hover .upload-icon,
.upload-area.dragover .upload-icon {
    color: var(--color-primary);
}

.upload-text {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.upload-hint {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.upload-input {
    display: none;
}

/* File List */
.file-list {
    margin-top: var(--spacing-md);
}

.file-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
}

.file-icon {
    font-size: 1.5rem;
    color: var(--color-primary);
}

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

.file-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-size {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.file-remove {
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.file-remove:hover {
    color: var(--color-danger);
}

/* ========================================
   Options Panel
======================================== */
.options-panel {
    display: grid;
    gap: var(--spacing-md);
}

@media (min-width: 768px) {
    .options-panel {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .options-panel {
        grid-template-columns: repeat(3, 1fr);
    }
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.option-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* ========================================
   Output Area
======================================== */
.output-area {
    position: relative;
}

.output-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.output-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.output-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.output-content {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    min-height: 200px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    overflow: auto;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Image Preview Grid */
.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.preview-item {
    position: relative;
    aspect-ratio: 1;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-tertiary);
}

.preview-item img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.preview-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-sm);
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    color: white;
    font-size: 0.75rem;
}

/* ========================================
   Progress Bar
======================================== */
.progress {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--color-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-normal);
}

.progress-bar.success {
    background: var(--color-success);
}

.progress-bar.error {
    background: var(--color-danger);
}

/* ========================================
   Tabs
======================================== */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-md);
    overflow-x: auto;
}

.tab-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: color var(--transition-fast), border-color var(--transition-fast);
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ========================================
   Toast Notifications
======================================== */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 300px;
    max-width: 400px;
    animation: slideIn var(--transition-normal);
}

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

.toast-icon {
    font-size: 1.25rem;
}

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

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

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

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

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.toast-message {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.toast-close {
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.toast-close:hover {
    color: var(--text-primary);
}

/* ========================================
   Loading Overlay
======================================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: var(--z-loading);
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

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

.loading-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ========================================
   Footer
======================================== */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: auto;
}

.footer-grid {
    display: grid;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
}

.footer-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.footer-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.footer-tagline {
    font-size: 0.75rem;
}

.text-danger {
    color: var(--color-danger);
}

/* ========================================
   Utilities
======================================== */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-muted {
    color: var(--text-muted);
}

.text-success {
    color: var(--color-success);
}

.text-danger {
    color: var(--color-danger);
}

.text-primary {
    color: var(--color-primary);
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.flex-wrap { flex-wrap: wrap; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-md); }
.gap-3 { gap: var(--spacing-lg); }

/* ========================================
   Homepage Specific
======================================== */
.hero {
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.hero-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

@media (min-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.category-grid {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

@media (min-width: 640px) {
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .category-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1280px) {
    .category-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-xl);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.category-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(37, 99, 235, 0.1);
    border-radius: var(--radius-lg);
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.category-name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.category-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Tool Cards */
.tools-grid {
    display: grid;
    gap: var(--spacing-md);
}

@media (min-width: 640px) {
    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .tools-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 1280px) {
    .tools-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.tool-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.tool-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.tool-card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    color: var(--color-primary);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.tool-card-content {
    flex: 1;
    min-width: 0;
}

.tool-card-name {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.tool-card-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ========================================
   Responsive Adjustments
======================================== */
@media (max-width: 767px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .tool-title {
        font-size: 1.25rem;
    }
    
    .upload-area {
        padding: var(--spacing-lg);
    }
    
    .upload-icon {
        font-size: 2rem;
    }
    
    .btn-lg {
        padding: var(--spacing-sm) var(--spacing-lg);
    }
}