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

:root {
    /* Color Palette */
    --bg-main: #1A1D24;
    --bg-navbar: #222831;
    --bg-sidebar: #1F232B;
    --bg-card: #252A34;
    --bg-button: #2A2F3A;
    --text-primary: #F0F0F0;
    --text-secondary: #A0A0B0;
    --accent-cyan: #00F5D4;
    --glow-shadow: rgba(0, 245, 212, 0.5);
    --glow-shadow-strong: rgba(0, 245, 212, 0.8);
    --border-color: #3A3F4A;
    --success-color: #00FF88;
    --error-color: #FF4757;
    --warning-color: #FFA726;
    
    /* 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: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px var(--glow-shadow);
    --shadow-glow-strong: 0 0 30px var(--glow-shadow-strong);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-main);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-cyan);
    border-radius: 4px;
    box-shadow: 0 0 10px var(--glow-shadow);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-cyan);
    box-shadow: 0 0 15px var(--glow-shadow-strong);
}

/* Navbar Styles */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-navbar);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    height: 70px;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 800;
    font-size: 1.25rem;
}

.logo-icon {
    font-size: 2rem;
    color: var(--accent-cyan);
    text-shadow: 0 0 20px var(--glow-shadow);
    animation: pulse 2s infinite;
}

.logo-text {
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--accent-cyan), #00D4AA);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

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

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--accent-cyan);
    border-radius: 2px;
    transition: var(--transition-normal);
    box-shadow: 0 0 10px var(--glow-shadow);
}

/* Main Container */
.main-container {
    display: flex;
    margin-top: 70px;
    min-height: calc(100vh - 70px);
}

/* Sidebar Styles */
.sidebar {
    width: 280px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0;
    position: fixed;
    height: calc(100vh - 70px);
    overflow-y: auto;
    transition: var(--transition-normal);
    z-index: 100;
}

.sidebar-header {
    padding: 0 var(--spacing-xl) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-lg);
}

.sidebar-header h3 {
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: 0 var(--spacing-md);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.nav-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 3px;
    background: var(--accent-cyan);
    transform: scaleY(0);
    transition: var(--transition-normal);
    box-shadow: 0 0 10px var(--glow-shadow);
}

.nav-item:hover,
.nav-item.active {
    background: rgba(0, 245, 212, 0.1);
    color: var(--text-primary);
    box-shadow: 0 0 20px rgba(0, 245, 212, 0.2);
}

.nav-item:hover::before,
.nav-item.active::before {
    transform: scaleY(1);
}

.nav-icon {
    font-size: 1.25rem;
    min-width: 24px;
}

.nav-text {
    font-weight: 500;
    font-size: 0.9rem;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 280px;
    padding: var(--spacing-2xl);
    background: var(--bg-main);
    min-height: calc(100vh - 70px);
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: var(--spacing-2xl) 0;
    margin-bottom: var(--spacing-2xl);
    background: linear-gradient(135deg, rgba(0, 245, 212, 0.05), rgba(0, 212, 170, 0.05));
    border-radius: var(--radius-xl);
    border: 1px solid rgba(0, 245, 212, 0.2);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 245, 212, 0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
    pointer-events: none;
}

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

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent-cyan), #00D4AA, #00B8D4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px var(--glow-shadow);
    display: block;
}

.hero-subtitle {
    display: block;
    color: var(--text-secondary);
    font-size: 0.6em;
    font-weight: 600;
    margin-top: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
    flex-wrap: wrap;
}

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

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-cyan);
    text-shadow: 0 0 20px var(--glow-shadow);
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: var(--spacing-xs);
}

/* Tools Grid */
.tools-grid {
    display: grid;
    gap: var(--spacing-xl);
}

.tool-card {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
    display: none;
}

.tool-card.active {
    display: block;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-cyan), #00D4AA);
    transform: scaleX(0);
    transition: var(--transition-normal);
}

.tool-card:hover {
    border-color: var(--accent-cyan);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.tool-card:hover::before {
    transform: scaleX(1);
}

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

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

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

.tool-description {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
}

/* File Upload Area */
.file-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    transition: var(--transition-normal);
    margin-bottom: var(--spacing-xl);
    background: rgba(0, 245, 212, 0.02);
}

.file-upload-area:hover,
.file-upload-area.dragover {
    border-color: var(--accent-cyan);
    background: rgba(0, 245, 212, 0.05);
    box-shadow: 0 0 20px rgba(0, 245, 212, 0.2);
}

.upload-icon {
    font-size: 3rem;
    color: var(--accent-cyan);
    margin-bottom: var(--spacing-md);
    opacity: 0.7;
}

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

.upload-btn {
    background: var(--bg-button);
    color: var(--text-primary);
    border: 1px solid var(--accent-cyan);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.upload-btn:hover {
    background: var(--accent-cyan);
    color: var(--bg-main);
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

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

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: rgba(0, 245, 212, 0.05);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    border: 1px solid rgba(0, 245, 212, 0.2);
}

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

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

.file-details {
    display: flex;
    flex-direction: column;
}

.file-name {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.9rem;
}

.file-size {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.file-remove {
    background: none;
    border: none;
    color: var(--error-color);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.file-remove:hover {
    background: rgba(255, 71, 87, 0.1);
}

/* Options */
.split-options,
.compress-options,
.convert-options,
.watermark-options,
.protect-options,
.unlock-options {
    background: rgba(0, 245, 212, 0.03);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    border: 1px solid rgba(0, 245, 212, 0.1);
}

.option-group {
    margin-bottom: var(--spacing-lg);
}

.option-group:last-child {
    margin-bottom: 0;
}

.option-label {
    display: block;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
}

.option-select,
.option-input {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-button);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: var(--transition-normal);
}

.option-select:focus,
.option-input:focus {
    outline: none;
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px rgba(0, 245, 212, 0.1);
}

.option-range {
    width: 100%;
    height: 6px;
    background: var(--bg-button);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

.option-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--accent-cyan);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--glow-shadow);
}

.option-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--accent-cyan);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 0 10px var(--glow-shadow);
}

.range-value {
    color: var(--accent-cyan);
    font-weight: 600;
    margin-left: var(--spacing-md);
}

/* Checkbox */
.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 0.9rem;
}

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

.checkmark {
    width: 20px;
    height: 20px;
    background: var(--bg-button);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin-right: var(--spacing-md);
    position: relative;
    transition: var(--transition-normal);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
    box-shadow: 0 0 10px var(--glow-shadow);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--bg-main);
    font-weight: bold;
    font-size: 0.8rem;
}

/* Text Output */
.text-output {
    width: 100%;
    min-height: 200px;
    padding: var(--spacing-md);
    background: var(--bg-button);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    line-height: 1.5;
    resize: vertical;
}

.text-output:focus {
    outline: none;
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px rgba(0, 245, 212, 0.1);
}

/* Action Buttons */
.tool-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: var(--transition-normal);
    border: none;
    font-size: 0.9rem;
    position: relative;
    overflow: hidden;
}

.action-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: var(--transition-slow);
}

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

.action-btn.primary {
    background: var(--accent-cyan);
    color: var(--bg-main);
    box-shadow: 0 4px 15px rgba(0, 245, 212, 0.3);
}

.action-btn.primary:hover {
    background: #00D4AA;
    box-shadow: var(--shadow-glow-strong);
    transform: translateY(-2px);
}

.action-btn.primary:disabled {
    background: var(--bg-button);
    color: var(--text-secondary);
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

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

.action-btn.secondary:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    box-shadow: 0 0 15px rgba(0, 245, 212, 0.2);
}

.btn-icon {
    font-size: 1rem;
}

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

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.footer-section h4 {
    color: var(--text-primary);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.9rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.footer-section ul li:hover {
    color: var(--accent-cyan);
    cursor: pointer;
}

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

.footer-bottom p {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    max-width: 400px;
    width: 90%;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-glow);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--accent-cyan);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-lg);
    box-shadow: 0 0 20px var(--glow-shadow);
}

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

.success-icon,
.error-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
}

.success-icon {
    color: var(--success-color);
    text-shadow: 0 0 20px rgba(0, 255, 136, 0.5);
}

.error-icon {
    color: var(--error-color);
    text-shadow: 0 0 20px rgba(255, 71, 87, 0.5);
}

.modal-content h3 {
    color: var(--text-primary);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

/* Animations */
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 20px var(--glow-shadow);
    }
    50% {
        box-shadow: 0 0 30px var(--glow-shadow-strong);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-content {
        margin-left: 0;
        padding: var(--spacing-lg);
    }
    
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-stats {
        gap: var(--spacing-lg);
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .tool-actions {
        justify-content: stretch;
    }
    
    .action-btn {
        flex: 1;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .nav-container {
        padding: 0 var(--spacing-lg);
    }
    
    .logo-text {
        font-size: 1rem;
    }
    
    .logo-subtitle {
        display: none;
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
    
    .hero-section {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .tool-card {
        padding: var(--spacing-lg);
    }
    
    .file-upload-area {
        padding: var(--spacing-lg);
    }
    
    .upload-icon {
        font-size: 2rem;
    }
    
    .tool-actions {
        flex-direction: column;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        padding: 0 var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 var(--spacing-md);
    }
    
    .main-content {
        padding: var(--spacing-sm);
    }
    
    .hero-section {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .tool-card {
        padding: var(--spacing-md);
    }
    
    .modal-content {
        padding: var(--spacing-lg);
        margin: var(--spacing-md);
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

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

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

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

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: var(--spacing-xs) !important; }
.mb-2 { margin-bottom: var(--spacing-sm) !important; }
.mb-3 { margin-bottom: var(--spacing-md) !important; }
.mb-4 { margin-bottom: var(--spacing-lg) !important; }
.mb-5 { margin-bottom: var(--spacing-xl) !important; }

.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: var(--spacing-xs) !important; }
.mt-2 { margin-top: var(--spacing-sm) !important; }
.mt-3 { margin-top: var(--spacing-md) !important; }
.mt-4 { margin-top: var(--spacing-lg) !important; }
.mt-5 { margin-top: var(--spacing-xl) !important; }

/* Print Styles */
@media print {
    .navbar,
    .sidebar,
    .footer {
        display: none;
    }
    
    .main-content {
        margin-left: 0;
        padding: 0;
    }
    
    .tool-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}