@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500;700&family=Inter:wght@300;400;500;600;700&family=Orbitron:wght@500;700;900&display=swap');

/* ==========================================================================
   CSS Variables & Design Tokens
   ========================================================================== */
:root {
    --bg-base: #000000;
    --bg-surface: #0a0a0c;
    --bg-surface-elevated: #111115;
    
    --primary: #9d4edd;
    --primary-light: #c77dff;
    --primary-dark: #7b2cbf;
    --primary-glow: rgba(157, 78, 221, 0.15);
    --primary-glow-strong: rgba(157, 78, 221, 0.4);
    
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    --border-subtle: rgba(157, 78, 221, 0.12);
    --border-medium: rgba(157, 78, 221, 0.25);
    --border-strong: rgba(157, 78, 221, 0.5);
    
    --font-heading: 'Orbitron', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'Fira Code', monospace;
    
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-quick: all 0.15s ease-out;
}

/* ==========================================================================
   Global Reset & Base Styles
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-dark) var(--bg-base);
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* Ambient glow blobs in background */
body::before {
    content: '';
    position: fixed;
    top: -10%;
    left: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, var(--primary-glow) 0%, rgba(0,0,0,0) 70%);
    z-index: -2;
    pointer-events: none;
    filter: blur(80px);
}

body::after {
    content: '';
    position: fixed;
    bottom: -10%;
    right: -10%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, rgba(123, 44, 191, 0.08) 0%, rgba(0,0,0,0) 75%);
    z-index: -2;
    pointer-events: none;
    filter: blur(100px);
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--primary-dark);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-quick);
}

code, pre {
    font-family: var(--font-mono);
}

/* ==========================================================================
   Layout & Scaffolding
   ========================================================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

section {
    padding: 100px 0;
    position: relative;
}

/* ==========================================================================
   Navbar Style
   ========================================================================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 12, 0.75);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-subtle);
    padding: 16px 0;
    transition: var(--transition-smooth);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-logo {
    height: 38px;
    width: auto;
}

.brand-name {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: 0.15em;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--primary);
    transition: var(--transition-quick);
}

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

.nav-link:hover::after {
    width: 100%;
}

.nav-cta {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    border: 1px solid var(--primary-light);
    color: var(--text-primary);
    padding: 10px 20px;
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    border-radius: 4px;
    cursor: pointer;
    box-shadow: 0 0 15px var(--primary-glow);
    transition: var(--transition-smooth);
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 25px var(--primary-glow-strong);
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    position: relative;
    text-align: center;
    overflow: hidden;
    padding-top: 20px;
    padding-bottom: 20px;
}

/* Dotted network overlay */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(var(--border-subtle) 1px, transparent 1px);
    background-size: 30px 30px;
    z-index: -1;
    opacity: 0.6;
}

.slogan-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(157, 78, 221, 0.06);
    border: 1px solid var(--border-medium);
    border-radius: 20px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--primary-light);
    letter-spacing: 0.2em;
    margin-bottom: 24px;
    box-shadow: inset 0 0 10px rgba(157, 78, 221, 0.05);
}

.hero-logo-full {
    max-width: 480px;
    width: 100%;
    height: auto;
    margin-bottom: 32px;
    filter: invert(1) hue-rotate(180deg) drop-shadow(0 0 30px rgba(157, 78, 221, 0.45));
}

.hero-tagline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto 40px auto;
    font-weight: 300;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.btn {
    padding: 16px 36px;
    border-radius: 4px;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    border: 1px solid var(--primary-light);
    color: #fff;
    box-shadow: 0 0 20px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--primary-glow-strong);
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
}

.btn-secondary {
    background: rgba(17, 17, 21, 0.6);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    backdrop-filter: blur(8px);
}

.btn-secondary:hover {
    border-color: var(--border-strong);
    color: #fff;
    background: rgba(20, 20, 26, 0.8);
    transform: translateY(-2px);
}

/* ==========================================================================
   Playground / IDE Section
   ========================================================================== */
.playground-section {
    background: linear-gradient(180deg, var(--bg-base) 0%, var(--bg-surface) 100%);
    border-top: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-label {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--primary-light);
    text-transform: uppercase;
    letter-spacing: 0.3em;
    display: block;
    margin-bottom: 12px;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.25rem;
    font-weight: 900;
    letter-spacing: 0.05em;
    color: #fff;
}

.section-desc {
    color: var(--text-secondary);
    max-width: 500px;
    margin: 12px auto 0 auto;
    font-weight: 300;
}

/* Playground Window Wrapper */
.playground-wrapper {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 24px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5), 0 0 40px var(--primary-glow);
    backdrop-filter: blur(12px);
}

@media (max-width: 900px) {
    .playground-wrapper {
        grid-template-columns: 1fr;
    }
}

/* Editor Frame */
.editor-frame {
    display: flex;
    flex-direction: column;
    background: var(--bg-base);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    overflow: hidden;
}

.frame-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-surface-elevated);
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-subtle);
}

.window-dots {
    display: flex;
    gap: 6px;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--border-medium);
}

.dot.red { background-color: #ef4444; }
.dot.yellow { background-color: #f59e0b; }
.dot.green { background-color: #10b981; }

.frame-title {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.example-selector-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.select-dropdown {
    background: var(--bg-base);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    padding: 4px 12px;
    border-radius: 4px;
    font-family: var(--font-body);
    font-size: 0.75rem;
    outline: none;
    cursor: pointer;
    transition: var(--transition-quick);
}

.select-dropdown:hover, .select-dropdown:focus {
    border-color: var(--primary);
}

/* Editor Text Area */
.editor-container {
    position: relative;
    flex-grow: 1;
    display: flex;
}

.editor-textarea {
    width: 100%;
    min-height: 280px;
    background: transparent;
    border: none;
    outline: none;
    color: #f4f4f5;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.5;
    padding: 16px;
    resize: vertical;
}

/* Controls Bar */
.controls-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-surface-elevated);
    padding: 12px 16px;
    border-top: 1px solid var(--border-subtle);
}

.action-buttons {
    display: flex;
    gap: 12px;
}

.btn-ctrl {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-base);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: 4px;
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: var(--transition-quick);
}

.btn-ctrl:hover {
    border-color: var(--primary);
    background: var(--bg-surface);
}

.btn-ctrl.primary-ctrl {
    background: var(--primary-dark);
    border-color: var(--primary);
}

.btn-ctrl.primary-ctrl:hover {
    background: var(--primary);
    box-shadow: 0 0 10px rgba(157, 78, 221, 0.3);
}

/* Status indicator */
.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.status-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    text-transform: uppercase;
}

.status-tag.ready { background: rgba(161, 161, 170, 0.1); color: var(--text-secondary); }
.status-tag.running { background: rgba(59, 130, 246, 0.1); color: #3b82f6; }
.status-tag.finished { background: rgba(16, 185, 129, 0.1); color: #10b981; }
.status-tag.error { background: rgba(239, 68, 68, 0.1); color: #ef4444; }

/* Visual Trace Panel */
.trace-panel {
    background: var(--bg-surface-elevated);
    border-top: 1px solid var(--border-subtle);
    padding: 12px 16px;
}

.trace-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.token-trace-container {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

.trace-empty {
    color: var(--text-muted);
    font-style: italic;
}

.trace-token {
    background: var(--bg-base);
    border: 1px solid var(--border-subtle);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--text-secondary);
    transition: var(--transition-quick);
}

.trace-token.active-token {
    background: var(--primary);
    border-color: var(--primary-light);
    color: #fff;
    font-weight: bold;
    box-shadow: 0 0 8px var(--primary-glow-strong);
    transform: scale(1.05);
}

.trace-token.calling-token {
    border-color: var(--primary-light);
    background: rgba(157, 78, 221, 0.15);
    color: var(--primary-light);
}

.trace-section {
    margin-bottom: 8px;
}

.trace-section:last-child {
    margin-bottom: 0;
}

.trace-tokens {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.accent-text {
    color: var(--primary-light);
    font-weight: bold;
}

/* Sidebar Info (Stack & Console) */
.playground-sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.sidebar-panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-base);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    overflow: hidden;
}

.sidebar-panel-header {
    background: var(--bg-surface-elevated);
    padding: 10px 16px;
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    justify-content: space-between;
}

.stack-count {
    font-family: var(--font-mono);
    color: var(--primary-light);
}

/* Visual Stack Visualizer */
.stack-visualizer {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-height: 180px;
    max-height: 220px;
    overflow-y: auto;
    background: radial-gradient(circle at top, rgba(157, 78, 221, 0.03) 0%, rgba(0,0,0,0) 80%);
}

.empty-stack-msg {
    margin: auto;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
}

.stack-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    padding: 8px 12px;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    transition: var(--transition-quick);
}

.stack-item.top-item {
    border-color: var(--primary);
    background: linear-gradient(90deg, var(--bg-surface-elevated) 0%, rgba(157, 78, 221, 0.05) 100%);
    box-shadow: 0 2px 10px rgba(157, 78, 221, 0.1);
}

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

.stack-value {
    color: var(--text-primary);
    font-weight: bold;
}

.stack-label {
    background: var(--primary);
    color: #fff;
    font-size: 0.6rem;
    padding: 1px 4px;
    border-radius: 3px;
    font-weight: bold;
}

@keyframes popIn {
    0% { transform: translateY(10px) scale(0.95); opacity: 0; }
    100% { transform: translateY(0) scale(1); opacity: 1; }
}

/* Console Print Panel */
.console-panel {
    padding: 16px;
    background: #050507;
    min-height: 130px;
    max-height: 180px;
    overflow-y: auto;
}

.console-output {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: #34d399; /* Green text console */
    white-space: pre-wrap;
    word-break: break-all;
}

/* Defined Words */
.words-panel {
    padding: 12px 16px;
    min-height: 70px;
}

.words-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
}

.no-words {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
}

.custom-word {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background: rgba(157, 78, 221, 0.1);
    border: 1px solid var(--border-medium);
    padding: 2px 8px;
    border-radius: 4px;
    color: var(--primary-light);
    cursor: help;
}

/* ==========================================================================
   Features Section
   ========================================================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 40px;
}

@media (max-width: 992px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

.feature-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 32px;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    transform: translateX(-100%);
    transition: var(--transition-smooth);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-medium);
    box-shadow: 0 10px 30px rgba(157, 78, 221, 0.05);
}

.feature-card:hover::before {
    transform: translateX(100%);
}

.feature-icon-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: rgba(157, 78, 221, 0.08);
    border: 1px solid var(--border-medium);
    border-radius: 8px;
    color: var(--primary-light);
    margin-bottom: 24px;
}

.feature-icon {
    font-size: 1.5rem;
}

.feature-title {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: 0.05em;
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    font-weight: 300;
}

/* ==========================================================================
   Code Walkthrough & Installing
   ========================================================================== */
.walkthrough-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

@media (max-width: 900px) {
    .walkthrough-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

.walkthrough-content h3 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    margin-bottom: 16px;
}

.walkthrough-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-weight: 300;
}

/* Terminal Shell Card */
.terminal-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    overflow: hidden;
}

.terminal-header {
    background: var(--bg-surface-elevated);
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-subtle);
}

.terminal-body {
    padding: 24px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.terminal-line {
    display: flex;
    margin-bottom: 8px;
}

.terminal-line:last-child {
    margin-bottom: 0;
}

.prompt {
    color: var(--primary-light);
    margin-right: 12px;
    user-select: none;
}

.command {
    color: #fff;
}

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

.output-line {
    color: var(--text-secondary);
}

.copy-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 4px 8px;
    border-radius: 4px;
    transition: var(--transition-quick);
}

.copy-btn:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.05);
}

.static-code-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    overflow: hidden;
    margin-top: 24px;
}

.static-code-body {
    padding: 20px;
    overflow-x: auto;
}

/* ==========================================================================
   Footer Section
   ========================================================================== */
.footer {
    background: var(--bg-surface);
    border-top: 1px solid var(--border-subtle);
    padding: 60px 0 40px 0;
    text-align: center;
}

.footer-logo {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.footer-logo-img {
    height: 32px;
    width: auto;
}

.footer-brand-name {
    font-family: var(--font-heading);
    font-weight: 900;
    font-size: 1.25rem;
    letter-spacing: 0.15em;
}

.footer-slogan {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--primary-light);
    letter-spacing: 0.2em;
    margin-bottom: 24px;
    text-transform: uppercase;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    list-style: none;
    margin-bottom: 32px;
}

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

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

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

/* ==========================================================================
   Stats Section
   ========================================================================== */
.stats-section {
    padding: 60px 0;
    background: linear-gradient(180deg, var(--bg-base) 0%, var(--bg-surface) 100%);
    border-bottom: 1px solid var(--border-subtle);
    border-top: 1px solid var(--border-subtle);
    position: relative;
    z-index: 10;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    text-align: center;
}

.stat-item {
    padding: 24px;
    border-radius: 8px;
    background: rgba(10, 10, 12, 0.4);
    border: 1px solid var(--border-subtle);
    box-shadow: inset 0 0 15px rgba(157, 78, 221, 0.03);
    transition: var(--transition-smooth);
}

.stat-item:hover {
    border-color: var(--border-medium);
    transform: translateY(-2px);
    box-shadow: inset 0 0 20px rgba(157, 78, 221, 0.05), 0 5px 15px rgba(0,0,0,0.4);
}

.stat-val {
    font-family: var(--font-heading);
    font-size: 2.25rem;
    font-weight: 900;
    color: var(--primary-light);
    text-shadow: 0 0 20px var(--primary-glow-strong);
    margin-bottom: 6px;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
    letter-spacing: 0.03em;
}

/* ==========================================================================
   Reference Page Custom Styles
   ========================================================================== */

.reference-page .navbar {
    border-bottom: 1px solid var(--border-medium);
}

.nav-link.nav-active {
    color: var(--text-primary) !important;
}

.nav-link.nav-active::after {
    width: 100% !important;
    background-color: var(--primary-light) !important;
}

/* Reference Hero Layout */
.ref-hero {
    position: relative;
    padding: 80px 0 60px 0;
    overflow: hidden;
    background: radial-gradient(circle at top right, rgba(157, 78, 221, 0.05) 0%, transparent 60%);
}

.ref-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(var(--border-subtle) 1px, transparent 1px);
    background-size: 30px 30px;
    z-index: -1;
    opacity: 0.5;
}

.ref-hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
}

.ref-hero-copy {
    display: flex;
    flex-direction: column;
}

.ref-hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 5.5vw, 4.2rem);
    font-weight: 900;
    line-height: 1.1;
    margin-top: 12px;
    margin-bottom: 24px;
    letter-spacing: 0.03em;
    background: linear-gradient(135deg, #ffffff 40%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.ref-hero-tagline {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 32px;
    font-weight: 300;
}

.command-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.cmd-item {
    background: rgba(157, 78, 221, 0.06);
    border: 1px solid var(--border-medium);
    border-radius: 6px;
    padding: 8px 16px;
}

.cmd-item code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--primary-light);
}

.ref-hero-visual {
    width: 100%;
}

.ref-stack-diagram {
    display: block;
    width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(0,0,0,0.6));
}

/* SVG Styling */
.ref-stack-diagram .panel-shell {
    fill: rgba(10, 10, 12, 0.85);
    stroke: var(--border-medium);
    stroke-width: 1.5;
}

.ref-stack-diagram .trace-line {
    fill: none;
    stroke: url(#trace);
    stroke-width: 5;
    stroke-linecap: round;
    filter: drop-shadow(0 0 6px rgba(157, 78, 221, 0.6));
}

.ref-stack-diagram .stack-card-group rect {
    fill: rgba(17, 17, 21, 0.8);
    stroke: var(--border-subtle);
    stroke-width: 1.5;
    transition: var(--transition-quick);
}

.ref-stack-diagram .stack-card-group:hover rect {
    stroke: var(--primary-light);
    fill: rgba(157, 78, 221, 0.1);
}

.ref-stack-diagram text {
    fill: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 15px;
}

.ref-stack-diagram .node rect {
    fill: rgba(157, 78, 221, 0.12);
    stroke: var(--primary-light);
    stroke-width: 2;
    transition: var(--transition-quick);
}

.ref-stack-diagram .node:hover rect {
    fill: rgba(157, 78, 221, 0.22);
    filter: drop-shadow(0 0 10px rgba(157, 78, 221, 0.3));
}

.ref-stack-diagram .node-title {
    font-family: var(--font-heading);
    font-size: 16px;
    font-weight: 700;
}

.ref-stack-diagram .node-title.bold {
    font-weight: 900;
    fill: var(--primary-light);
}

.ref-stack-diagram .node.small rect {
    fill: rgba(20, 20, 26, 0.7);
    stroke: var(--border-medium);
    stroke-width: 1.5;
}

.ref-stack-diagram .node.small:hover rect {
    stroke: var(--primary-light);
    fill: rgba(157, 78, 221, 0.08);
}

.ref-stack-diagram .node.small text {
    font-size: 14px;
    font-family: var(--font-body);
    font-weight: 500;
}

.ref-stack-diagram .connector {
    fill: none;
    stroke: var(--border-medium);
    stroke-width: 1.5;
    stroke-dasharray: 6 6;
}

.ref-stack-diagram .caption {
    fill: var(--text-secondary);
    font-size: 14px;
    font-family: var(--font-mono);
}

/* Reference Sections */
.ref-section {
    padding: 80px 0;
    border-bottom: 1px solid var(--border-subtle);
    position: relative;
}

.ref-section.quickstart {
    background: radial-gradient(circle at center, rgba(157, 78, 221, 0.03) 0%, transparent 70%);
}

/* Code Blocks */
.code-block-wrapper {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    overflow: hidden;
    max-width: 900px;
    margin: 32px auto 0 auto;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
}

.code-block {
    position: relative;
    padding: 24px;
    background: #060608;
    color: #e4e4e7;
    margin: 0;
    overflow-x: auto;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.6;
}

.copy-button {
    position: absolute;
    top: 14px;
    right: 14px;
    background: rgba(157, 78, 221, 0.1);
    border: 1px solid var(--border-medium);
    color: var(--primary-light);
    border-radius: 4px;
    padding: 4px 10px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition-quick);
}

.copy-button:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary-light);
    box-shadow: 0 0 10px var(--primary-glow);
}

/* Syntax Cards */
.syntax-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.syntax-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: var(--transition-smooth);
}

.syntax-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-medium);
    box-shadow: 0 10px 20px rgba(157, 78, 221, 0.05);
}

.syntax-card-header h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: #fff;
    margin: 0;
}

.syntax-card pre {
    background: #060608;
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 6px;
    padding: 12px;
    overflow-x: auto;
    margin: 0;
}

.syntax-card pre code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--primary-light);
}

.syntax-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 300;
    line-height: 1.5;
    margin: 0;
}

/* Implemented Words Section */
.words-section {
    background: linear-gradient(180deg, var(--bg-base) 0%, var(--bg-surface) 100%);
}

.word-tools-wrapper {
    background: rgba(10, 10, 12, 0.5);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    padding: 24px;
    margin-top: 32px;
    margin-bottom: 40px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.word-tools {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.search-box-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.search-label-text {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--primary-light);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

#word-search {
    width: 100%;
    background: #060608;
    border: 1px solid var(--border-medium);
    color: #fff;
    padding: 12px 16px;
    border-radius: 6px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition-quick);
}

#word-search:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 12px var(--primary-glow);
}

.filter-row-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.filter-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.filter-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.filter-button {
    background: rgba(20, 20, 26, 0.6);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 6px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition-quick);
}

.filter-button:hover {
    border-color: var(--border-medium);
    color: #fff;
}

.filter-button.active {
    background: var(--primary-dark);
    border-color: var(--primary-light);
    color: #fff;
    box-shadow: 0 0 10px var(--primary-glow);
}

.word-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
    min-height: 200px;
}

.word-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    transition: var(--transition-smooth);
}

.word-card:hover {
    border-color: var(--border-medium);
    transform: translateY(-4px);
    box-shadow: 0 10px 25px rgba(157, 78, 221, 0.05);
}

.word-card header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.word-card h3 {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    color: #fff;
    margin: 0;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 4px;
    text-transform: uppercase;
    background: rgba(157, 78, 221, 0.1);
    color: var(--primary-light);
    border: 1px solid var(--border-subtle);
}

/* Category highlights */
.tag.tag-math { color: #f59e0b; background: rgba(245, 158, 11, 0.1); border-color: rgba(245, 158, 11, 0.2); }
.tag.tag-stack { color: #3b82f6; background: rgba(59, 130, 246, 0.1); border-color: rgba(59, 130, 246, 0.2); }
.tag.tag-data { color: #10b981; background: rgba(16, 185, 129, 0.1); border-color: rgba(16, 185, 129, 0.2); }
.tag.tag-collection { color: #14b8a6; background: rgba(20, 184, 166, 0.1); border-color: rgba(20, 184, 166, 0.2); }
.tag.tag-string { color: #0ea5e9; background: rgba(14, 165, 233, 0.1); border-color: rgba(14, 165, 233, 0.2); }
.tag.tag-oop { color: #ec4899; background: rgba(236, 72, 153, 0.1); border-color: rgba(236, 72, 153, 0.2); }
.tag.tag-control { color: #a855f7; background: rgba(168, 85, 247, 0.1); border-color: rgba(168, 85, 247, 0.2); }
.tag.tag-web { color: #06b6d4; background: rgba(6, 182, 212, 0.1); border-color: rgba(6, 182, 212, 0.2); }
.tag.tag-result { color: #f43f5e; background: rgba(244, 63, 94, 0.1); border-color: rgba(244, 63, 94, 0.2); }
.tag.tag-system { color: #f97316; background: rgba(249, 115, 22, 0.1); border-color: rgba(249, 115, 22, 0.2); }
.tag.tag-inspect { color: #d946ef; background: rgba(217, 70, 239, 0.1); border-color: rgba(217, 70, 239, 0.2); }

.stack-effect {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    background: rgba(157, 78, 221, 0.05);
    border: 1px solid var(--border-subtle);
    padding: 8px 12px;
    border-radius: 6px;
    color: var(--primary-light);
    white-space: nowrap;
    overflow-x: auto;
}

.word-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
    flex-grow: 1;
    font-weight: 300;
    margin: 0;
}

.word-card p code {
    background: rgba(255, 255, 255, 0.06);
    color: #fff;
    padding: 1px 4px;
    border-radius: 3px;
    font-size: 0.85rem;
}

.word-example-code {
    position: relative;
    background: #060608;
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 6px;
    padding: 12px;
    overflow-x: auto;
    margin: 0;
}

.word-example-code code {
    font-family: var(--font-mono);
    color: #e4e4e7;
}

.word-example-code .copy-button {
    position: absolute;
    top: 8px;
    right: 8px;
    background: rgba(255, 255, 255, 0.05);
    border: none;
    color: var(--text-muted);
    border-radius: 3px;
    padding: 2px 6px;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    cursor: pointer;
    transition: var(--transition-quick);
}

.word-example-code .copy-button:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary-light);
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
    padding: 40px 0;
}

/* Code Examples Grid */
.code-examples-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.code-example-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.code-example-card.wide-card {
    grid-column: span 2;
}

.code-example-card .card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 12px;
}

.code-example-card h3 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
    color: #fff;
    margin: 0;
}

.file-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--primary-light);
}

.card-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 300;
    margin: 0;
}

.code-example-card .code-block {
    margin: 0;
    border: 1px solid rgba(255, 255, 255, 0.04);
}

/* MVC Section */
.mvc-section {
    background: linear-gradient(180deg, var(--bg-base) 0%, var(--bg-surface) 100%);
}

.stack-rail {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 40px;
    margin-bottom: 40px;
}

.rail-item {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: var(--transition-smooth);
}

.rail-item:hover {
    border-color: var(--border-medium);
    box-shadow: 0 8px 20px rgba(157, 78, 221, 0.05);
}

.rail-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--primary-dark);
    color: #fff;
    border-radius: 50%;
    font-family: var(--font-mono);
    font-weight: bold;
    font-size: 0.9rem;
    border: 1px solid var(--primary-light);
}

.rail-label strong {
    display: block;
    color: #fff;
    font-size: 1.05rem;
    margin-bottom: 4px;
}

.rail-label small {
    display: block;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

/* Debugging Outputs */
.terminal-stdout-box {
    background: #040405;
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 20px;
    overflow-x: auto;
    font-size: 0.85rem;
    margin: 0;
}

.terminal-stdout-box code {
    font-family: var(--font-mono);
    color: #10b981;
    line-height: 1.6;
}

/* CLI Reference List */
.cli-list-wrapper {
    background: rgba(10, 10, 12, 0.5);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    padding: 24px;
    margin-top: 40px;
}

.cli-list-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.cli-row {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 24px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 16px 24px;
    align-items: center;
    transition: var(--transition-quick);
}

.cli-row:hover {
    border-color: var(--border-medium);
    box-shadow: 0 4px 15px rgba(157, 78, 221, 0.03);
}

.cli-cmd-col code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--primary-light);
    background: rgba(157, 78, 221, 0.05);
    padding: 4px 12px;
    border-radius: 4px;
    border: 1px solid var(--border-subtle);
    display: inline-block;
}

.cli-desc-col {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 300;
}

/* Limits List */
.limits-card {
    background: rgba(239, 68, 68, 0.02);
    border: 1px solid rgba(239, 68, 68, 0.1);
    border-radius: 8px;
    padding: 28px 32px;
    margin-top: 40px;
}

.limit-list {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    font-weight: 300;
    padding-left: 20px;
    margin: 0;
}

.limit-list li {
    margin-bottom: 12px;
}

.limit-list li::marker {
    color: #ef4444;
}

.limit-list li code {
    background: rgba(255, 255, 255, 0.05);
    padding: 1px 4px;
    border-radius: 3px;
    font-size: 0.85rem;
}

/* Media Queries for reference-specific layouts */
@media (max-width: 992px) {
    .ref-hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .ref-hero-visual {
        max-width: 600px;
        margin: 0 auto;
    }
    
    .command-strip {
        justify-content: center;
    }
}

@media (max-width: 900px) {
    .code-examples-grid {
        grid-template-columns: 1fr;
    }
    .code-example-card.wide-card {
        grid-column: auto;
    }
    .stack-rail {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .cli-row {
        grid-template-columns: 1fr;
        gap: 12px;
        padding: 16px 20px;
    }
}

@media (max-width: 480px) {
    .stack-rail {
        grid-template-columns: 1fr;
    }
    .ref-hero-title {
        font-size: 2.2rem;
    }
}