/* ===== SORTING VISUALIZER STYLES ===== */

/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
    /* Color Palette */
    --primary-color: #151f32;
    --secondary-color: #1c2382;
    --accent-color: #00d4ff;
    --success-color: #00ff88;
    --warning-color: #ffd700;
    --error-color: #ff4757;
    --text-primary: #ffffff;
    --text-secondary: #b8c5d6;
    --text-muted: #8892a0;
    
    /* Typography */
    --font-primary: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Unbounded', 'Fira Sans', sans-serif;
    --font-mono: 'Fira Code', 'Consolas', 'Monaco', monospace;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Header */
    --header-bg: rgba(0, 0, 0, 0.3);
    --max-width: 1400px;
    --font-size-2xl: clamp(1.5rem, 4vw, 2.5rem);
    --font-size-3xl: clamp(2rem, 5vw, 3rem);
    --font-size-xl: 1.2em;
    --font-size-lg: 1.1em;
    --font-size-sm: 0.875rem;
    --font-size-xs: 0.75rem;
    --font-weight-bold: 700;
    --font-weight-semibold: 600;

    /* Slider */
    --slider-bg: rgba(255, 255, 255, 0.2);
}

/* ===== TYPOGRAPHY ===== */
@import url('https://fonts.googleapis.com/css2?family=Unbounded:wght@400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Fira+Sans:ital,wght@0,300;0,400;0,500;0,600;1,400&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

/* ===== BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background var(--transition-slow);
}

body.algorithm-running {
    background: linear-gradient(135deg, #1a0f2e 0%, #2d1b4e 100%);
}

/* ===== UTILITY CLASSES ===== */
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* ===== HEADER STYLES ===== */
.app-header {
    background: var(--header-bg);
    border-bottom: 2px solid var(--accent-color);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.header-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

.app-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.app-title .big {
    font-size: var(--font-size-3xl);
    color: var(--accent-color);
    text-shadow: 0 0 10px var(--accent-color);
}

.app-title .emoji {
    font-size: var(--font-size-xl);
    margin-left: var(--spacing-xs);
}

/* ===== NAVIGATION TOGGLE ===== */
.nav-toggle {
    display: flex;
    align-items: center;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--accent-color);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-semibold);
    transition: all var(--transition-normal);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.nav-link:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.nav-link:active {
    transform: translateY(0);
}

.nav-icon {
    font-size: var(--font-size-lg);
}

.nav-text {
    font-size: var(--font-size-sm);
}

/* ===== CONTROLS PANEL ===== */
.controls-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.control-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    flex: 1;
}

.control-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    min-width: 120px;
}

.control-item.compact {
    min-width: 100px;
}

.control-label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.slider {
    flex: 1;
    height: 6px;
    background: var(--slider-bg);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.slider::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: all var(--transition-normal);
}

.slider::-webkit-slider-thumb:hover {
    background: var(--secondary-color);
    transform: scale(1.1);
}

.slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.slider-value {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: var(--accent-color);
    min-width: 30px;
    text-align: center;
}

.action-buttons {
    display: flex;
    gap: var(--spacing-md);
}

/* ===== BUTTON STYLES ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
}

.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;
}

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

.btn:active {
    transform: translateY(1px);
}

.btn-icon {
    font-size: var(--font-size-lg);
}

.btn-text {
    white-space: nowrap;
}

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

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

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-algorithm {
    background: linear-gradient(45deg, var(--warning-color), var(--accent-color));
    color: var(--text-primary);
    font-size: 1rem;
    padding: var(--spacing-lg) var(--spacing-xl);
}

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

.btn-algorithm:disabled,
.btn-algorithm.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ===== MAIN CONTENT ===== */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* ===== VISUALIZATION SECTION ===== */
.visualization-section {
    margin-bottom: var(--spacing-3xl);
}

.array-container {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    min-height: 400px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 2px;
    overflow-x: auto;
}

.array-display {
    display: flex;
    align-items: flex-end;
    gap: 2px;
    min-height: 350px;
    width: 100%;
    justify-content: center;
}

/* ===== ARRAY BARS ===== */
.bar {
    background: var(--warning-color);
    border-radius: 2px 2px 0 0;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: var(--spacing-xs);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
    transition: all var(--transition-fast);
    min-width: 8px;
    position: relative;
}

.bar:hover {
    transform: scale(1.05);
    z-index: 10;
}

/* ===== ALGORITHM CONTROLS ===== */
.algorithm-controls {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.controls-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.algorithm-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

/* ===== NAVIGATION CONTROLS ===== */
.navigation-controls {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* ===== DOCUMENTATION SECTION ===== */
.documentation-section {
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2rem;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    color: var(--text-primary);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), var(--success-color));
    border-radius: 2px;
}

.documentation-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-2xl);
}

/* ===== CODE EXAMPLE ===== */
.code-example {
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.code-header {
    background: rgba(0, 0, 0, 0.5);
    padding: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.code-header h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.code-tabs {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.tab-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 0.875rem;
}

.tab-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--accent-color);
    color: var(--text-primary);
    border-color: var(--accent-color);
}

.code-content {
    padding: var(--spacing-lg);
}

.tab-content {
    display: none;
}

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

.tab-content pre {
    background: rgba(0, 0, 0, 0.5);
    border-radius: var(--radius-sm);
    padding: var(--spacing-lg);
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
}

/* ===== COMPLEXITY ANALYSIS ===== */
.complexity-analysis {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.complexity-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}

.complexity-card h3 {
    color: var(--accent-color);
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.complexity-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.complexity-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-sm);
}

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

.complexity-value {
    color: var(--success-color);
    font-weight: 600;
    font-family: var(--font-mono);
}

/* ===== NOTIFICATION SYSTEM ===== */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: 600;
    z-index: 1000;
    animation: slideInRight 0.3s ease-out;
    max-width: 300px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.notification-info {
    background: var(--accent-color);
    border-left: 4px solid var(--secondary-color);
}

.notification-success {
    background: var(--success-color);
    border-left: 4px solid var(--primary-color);
    color: var(--primary-color);
}

.notification-warning {
    background: var(--warning-color);
    border-left: 4px solid var(--primary-color);
    color: var(--primary-color);
}

.notification-error {
    background: var(--error-color);
    border-left: 4px solid var(--primary-color);
}

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

/* ===== BUTTON DISABLED STATE ===== */
.btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

/* ===== ALGORITHM RUNNING STATE ===== */
body.algorithm-running {
    cursor: wait;
}

body.algorithm-running .btn:not(.disabled) {
    cursor: wait;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1200px) {
    .header-content {
        padding: 0 var(--spacing-md);
    }
    
    .control-group {
        gap: var(--spacing-md);
    }
    
    .control-item {
        min-width: 110px;
    }
    
    .control-item.compact {
        min-width: 90px;
    }
}

@media (max-width: 768px) {
    .header-top {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .app-title {
        font-size: var(--font-size-xl);
    }
    
    .app-title .big {
        font-size: var(--font-size-2xl);
    }
    
    .controls-panel {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .control-group {
        flex-direction: column;
        gap: var(--spacing-md);
        width: 100%;
    }
    
    .control-item {
        min-width: 100%;
        align-items: center;
    }
    
    .control-item.compact {
        min-width: 100%;
    }
    
    .slider-container {
        width: 100%;
        max-width: 200px;
    }
    
    .action-buttons {
        width: 100%;
        justify-content: center;
    }
    
    .btn.compact {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }
    
    .nav-link {
        padding: var(--spacing-sm) var(--spacing-lg);
    }
    
    .nav-text {
        display: none;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .documentation-section {
        padding: var(--spacing-lg);
    }
    
    .code-tabs {
        flex-direction: column;
    }
    
    .tab-btn {
        text-align: center;
    }
}

/* ===== ACCESSIBILITY IMPROVEMENTS ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===== ADDITIONAL IMPROVEMENTS ===== */
.controls-panel {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.control-item.compact .control-label {
    text-align: center;
    margin-bottom: var(--spacing-xs);
}

.slider-container {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.slider-value {
    background: var(--accent-color);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-weight: var(--font-weight-bold);
    min-width: 35px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.btn.compact {
    background: linear-gradient(45deg, var(--accent-color), var(--secondary-color));
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn.compact:hover {
    background: linear-gradient(45deg, var(--secondary-color), var(--accent-color));
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

/* ===== SMOOTH TRANSITIONS ===== */
.app-header,
.controls-panel,
.control-item,
.slider-container,
.btn {
    transition: all var(--transition-normal);
}

/* ===== FOCUS STATES ===== */
.slider:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.btn:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.nav-link:focus {
    outline: 2px solid var(--text-primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --text-primary: #000000;
        --text-secondary: #333333;
        --primary-color: #ffffff;
        --secondary-color: #f0f0f0;
    }
}