/* 
   macOS Sequoia Inspired Design System for Prime Tree Encoding Visualizer
*/

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --bg-main: #09090b;
    --bg-window: #131316;
    --bg-sidebar: rgba(24, 24, 28, 0.65);
    --bg-card: #1c1c21;
    --bg-card-hover: #25252c;
    --bg-input: #0f0f12;
    
    --border-color: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    
    --text-primary: #f4f4f5;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    --accent-blue: #3b82f6;
    --accent-purple: #a855f7;
    --accent-green: #10b981;
    --accent-orange: #f97316;
    
    --glow-blue: rgba(59, 130, 246, 0.25);
    --glow-green: rgba(16, 185, 129, 0.25);
    
    --titlebar-height: 52px;
    --sidebar-width: 300px;
    
    --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-sans);
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* macOS App Container */
.app-container {
    width: 95vw;
    height: 90vh;
    max-width: 1400px;
    max-height: 900px;
    background-color: var(--bg-window);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    animation: fadeIn 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.97) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

/* macOS Title Bar */
.title-bar {
    height: var(--titlebar-height);
    background-color: rgba(19, 19, 22, 0.95);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    user-select: none;
    z-index: 10;
}

/* Traffic Lights */
.traffic-lights {
    display: flex;
    gap: 8px;
}
.traffic-light {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    position: relative;
}
.traffic-light.red { background-color: #ff5f56; }
.traffic-light.yellow { background-color: #ffbd2e; }
.traffic-light.green { background-color: #27c93f; }

/* Tab Bar Control */
.view-selector {
    display: flex;
    background-color: rgba(255, 255, 255, 0.04);
    border-radius: 8px;
    padding: 3px;
    border: 1px solid var(--border-color);
}
.tab-btn {
    padding: 6px 16px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}
.tab-btn:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.02);
}
.tab-btn.active {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.08);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

/* App Logo Title */
.app-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}
.app-title span {
    font-size: 10px;
    text-transform: uppercase;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 700;
}

/* Main Body Window */
.window-body {
    flex: 1;
    display: flex;
    overflow: hidden;
}

/* Translucent Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-sidebar);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-right: 1px solid var(--border-color);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
}

/* Main Workspace */
.workspace {
    flex: 1;
    background-color: var(--bg-window);
    overflow: hidden;
    position: relative;
}

.tab-content {
    width: 100%;
    height: 100%;
    display: none;
    padding: 24px;
    overflow-y: auto;
}
.tab-content.active {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Sidebar Section Headers */
.section-title {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    font-weight: 700;
    margin-bottom: 8px;
}

/* Inputs & Form Controls */
.control-group {
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.input-label {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
}

.number-input-row {
    display: flex;
    gap: 8px;
}

input[type="number"] {
    flex: 1;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 12px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 15px;
    font-weight: 500;
    outline: none;
    transition: all 0.2s ease;
}
input[type="number"]:focus {
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 2px var(--glow-blue);
}

.scan-slider {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
}
.scan-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--text-primary);
    border: 2px solid var(--accent-blue);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

/* Select Dropdown */
select {
    width: 100%;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 12px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 500;
    outline: none;
    cursor: pointer;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a1a1aa' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    -webkit-appearance: none;
    -moz-appearance: none;
}
select:focus {
    border-color: var(--accent-purple);
}

/* Preset Cards Grid */
.presets-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}
.preset-btn {
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 4px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
}
.preset-btn:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.08);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}
.preset-btn.active {
    background-color: rgba(59, 130, 246, 0.15);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

/* Workspace Layout Split */
.split-view {
    display: flex;
    flex: 1;
    gap: 20px;
    height: 100%;
}

.visualizer-pane {
    flex: 1.5;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    min-height: 400px;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.4);
}

.inspector-pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
    height: 100%;
    overflow-y: auto;
}

/* Interactive SVG Styles */
.interactive-svg {
    width: 100%;
    height: 100%;
    cursor: default;
}
.svg-node {
    cursor: pointer;
}
.svg-node circle {
    transition: r 0.2s cubic-bezier(0.16, 1, 0.3, 1), stroke 0.3s, fill 0.3s;
}

@keyframes pulse {
    0% { filter: drop-shadow(0 0 2px var(--accent-green)); }
    50% { filter: drop-shadow(0 0 10px var(--accent-green)); }
    100% { filter: drop-shadow(0 0 2px var(--accent-green)); }
}
.pulse-active {
    animation: pulse 2s infinite;
}

/* Inspector Cards */
.inspector-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.card-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-value {
    font-family: var(--font-mono);
    font-size: 18px;
    color: var(--text-primary);
    background-color: rgba(0,0,0,0.2);
    border-radius: 8px;
    padding: 8px 12px;
    border: 1px solid rgba(255,255,255,0.03);
    word-break: break-all;
}

/* Walkthrough Drawer & Alert cards */
.math-walkthrough {
    background-color: rgba(255, 255, 255, 0.015);
    border-left: 3px solid var(--accent-purple);
    border-radius: 0 12px 12px 0;
    padding: 14px;
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-secondary);
}
.math-walkthrough strong {
    color: var(--text-primary);
}

.math-step {
    margin-bottom: 12px;
}
.math-step:last-child {
    margin-bottom: 0;
}

/* Info pill badges */
.badge {
    display: inline-block;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    padding: 2px 8px;
    border-radius: 9999px;
}
.badge.blue {
    background-color: rgba(59, 130, 246, 0.15);
    color: var(--accent-blue);
    border: 1px solid rgba(59, 130, 246, 0.2);
}
.badge.purple {
    background-color: rgba(168, 85, 247, 0.15);
    color: var(--accent-purple);
    border: 1px solid rgba(168, 85, 247, 0.2);
}
.badge.green {
    background-color: rgba(16, 185, 129, 0.15);
    color: var(--accent-green);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

/* Tooltip (floating overlay) */
.tooltip-overlay {
    position: absolute;
    background-color: rgba(19, 19, 22, 0.95);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 12px;
    line-height: 1.5;
    color: var(--text-secondary);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    pointer-events: none;
    z-index: 1000;
    display: none;
    backdrop-filter: blur(10px);
}
.tooltip-overlay strong {
    color: var(--text-primary);
}

/* Playground View Styles */
.playground-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.input-area {
    width: 100%;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 14px;
    outline: none;
    resize: none;
    height: 80px;
}
.input-area:focus {
    border-color: var(--accent-blue);
}

.eval-btn {
    align-self: flex-start;
    background: linear-gradient(135deg, var(--accent-blue), #2563eb);
    border: none;
    border-radius: 8px;
    color: #ffffff;
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 600;
    padding: 10px 20px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.3);
}
.eval-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 12px -2px rgba(59, 130, 246, 0.4);
}

/* Binary complexity table */
.complexity-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
    font-size: 13px;
}
.complexity-table th {
    text-align: left;
    padding: 8px 12px;
    border-bottom: 2px solid var(--border-color);
    color: var(--text-secondary);
    font-weight: 600;
}
.complexity-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border-color);
    font-family: var(--font-sans);
}
.complexity-table tr:last-child td {
    border-bottom: none;
}
.complexity-table code {
    font-family: var(--font-mono);
    background-color: rgba(255,255,255,0.04);
    padding: 2px 6px;
    border-radius: 4px;
}

/* Helper details list */
.detail-item {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    border-bottom: 1px solid rgba(255,255,255,0.03);
    padding: 8px 0;
}
.detail-item:last-child {
    border-bottom: none;
}
.detail-item .label {
    color: var(--text-secondary);
}
.detail-item .value {
    font-family: var(--font-mono);
    color: var(--text-primary);
}

/* Floating Controls inside Visualizer */
.zoom-controls {
    position: absolute;
    bottom: 16px;
    right: 16px;
    display: flex;
    gap: 8px;
    background-color: rgba(19, 19, 22, 0.85);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 4px;
}

.zoom-btn {
    width: 28px;
    height: 28px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: background 0.2s;
}
.zoom-btn:hover {
    background-color: rgba(255,255,255,0.1);
}

/* Empty states */
.empty-state {
    font-size: 14px;
    color: var(--text-muted);
    font-style: italic;
}