/* ==========================================================================
   Design Tokens & Themes (Strict Minimalist B&W)
   ========================================================================== */
:root {
    /* Color Palette - Light Mode */
    --bg-primary: #FFFFFF;
    --bg-secondary: #FAFAFA;
    --bg-header: rgba(255, 255, 255, 0.85);
    --bg-card: #FFFFFF;
    
    /* Code Blocks (Always Dark for contrast) */
    --bg-code-block: #0D1117;
    --border-code-block: #30363D;
    --text-code-block: #C9D1D9;
    
    /* Inline Code */
    --bg-inline-code: #F6F8FA;
    --text-inline-code: #24292F;
    --border-inline-code: #AFB8C1;
    
    /* Text Colors */
    --text-primary: #111111;
    --text-secondary: #666666;
    --text-muted: #8E8E93;
    
    /* Borders */
    --border-color: #E5E5E5;
    --border-hover: #D1D1D6;
    
    /* Buttons */
    --btn-bg: #111111;
    --btn-text: #FFFFFF;
    --btn-hover: #222222;
    --btn-sec-bg: #FFFFFF;
    --btn-sec-text: #111111;
    --btn-sec-border: #E5E5E5;
    --btn-sec-hover: #FAFAFA;
    
    /* Shadows (Very soft, almost invisible) */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.02);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.06);
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Constants */
    --max-width: 960px;
    --header-height: 64px;
    --transition-speed: 0.2s;
    --border-radius: 12px;
}

@media (prefers-color-scheme: dark) {
    html:not(.light) {
        /* Color Palette - Dark Mode */
        --bg-primary: #0A0A0A;
        --bg-secondary: #000000;
        --bg-header: rgba(10, 10, 10, 0.85);
        --bg-card: #121212;
        
        /* Text Colors */
        --text-primary: #FAFAFA;
        --text-secondary: #A1A1AA;
        --text-muted: #52525B;
        
        /* Inline Code */
        --bg-inline-code: #161B22;
        --text-inline-code: #E6EDF0;
        --border-inline-code: #30363D;
        
        /* Borders */
        --border-color: #27272A;
        --border-hover: #3F3F46;
        
        /* Buttons */
        --btn-bg: #FAFAFA;
        --btn-text: #111111;
        --btn-hover: #E4E4E7;
        --btn-sec-bg: #0A0A0A;
        --btn-sec-text: #FAFAFA;
        --btn-sec-border: #27272A;
        --btn-sec-hover: #121212;
        
        /* Shadows */
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
        --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.5);
    }
}

html.dark {
    /* Color Palette - Dark Mode */
    --bg-primary: #0A0A0A;
    --bg-secondary: #000000;
    --bg-header: rgba(10, 10, 10, 0.85);
    --bg-card: #121212;
    
    /* Text Colors */
    --text-primary: #FAFAFA;
    --text-secondary: #A1A1AA;
    --text-muted: #52525B;
    
    /* Inline Code */
    --bg-inline-code: #161B22;
    --text-inline-code: #E6EDF0;
    --border-inline-code: #30363D;
    
    /* Borders */
    --border-color: #27272A;
    --border-hover: #3F3F46;
    
    /* Buttons */
    --btn-bg: #FAFAFA;
    --btn-text: #111111;
    --btn-hover: #E4E4E7;
    --btn-sec-bg: #0A0A0A;
    --btn-sec-text: #FAFAFA;
    --btn-sec-border: #27272A;
    --btn-sec-hover: #121212;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   Base CSS & Resets
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    overflow-x: hidden;
    width: 100%;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.625;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    width: 100%;
}

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

code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background-color: var(--bg-inline-code);
    color: var(--text-inline-code);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    border: 1px solid var(--border-inline-code);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: var(--bg-header);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1.5rem;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    margin-right: auto;
}

.logo-icon {
    width: 18px;
    height: 18px;
    color: var(--text-primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    order: 3;
}

.menu-toggle-btn {
    display: none; /* hidden on desktop */
    background: none;
    border: 1px solid var(--border-color);
    width: 44px;
    height: 44px;
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.menu-toggle-btn:hover {
    background-color: var(--bg-secondary);
    border-color: var(--border-hover);
}

.menu-icon {
    width: 20px;
    height: 20px;
    stroke: currentColor;
}

/* Hamburger lines transition */
.menu-toggle-btn .line-top,
.menu-toggle-btn .line-mid,
.menu-toggle-btn .line-bot {
    transition: transform 0.2s ease, opacity 0.2s ease;
    transform-origin: center;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    order: 2;
    margin-right: 1.25rem;
}

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

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

.github-nav-link {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.35rem 0.7rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
}

.github-nav-link:hover {
    background-color: var(--bg-secondary);
    border-color: var(--border-hover);
}

.github-icon {
    width: 14px;
    height: 14px;
}

/* Theme Toggle Button & SVG Icon Visibility */
.theme-toggle-btn {
    background: none;
    border: 1px solid var(--border-color);
    width: 44px;
    height: 44px;
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.theme-toggle-btn:hover {
    background-color: var(--bg-secondary);
    border-color: var(--border-hover);
}

.theme-toggle-btn svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    fill: none;
    display: none;
}

/* Light Mode / Default Light state: show sun, hide moon */
html.light .sun-icon,
html:not(.dark):not(.light) .sun-icon {
    display: block;
}
html.light .moon-icon,
html:not(.dark):not(.light) .moon-icon {
    display: none;
}

/* Dark Mode / Default Dark state: show moon, hide sun */
html.dark .moon-icon {
    display: block;
}
html.dark .sun-icon {
    display: none;
}

@media (prefers-color-scheme: dark) {
    html:not(.light) .moon-icon {
        display: block;
    }
    html:not(.light) .sun-icon {
        display: none;
    }
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
    padding: calc(var(--header-height) + 5rem) 1.5rem 5rem 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.hero-container {
    max-width: 680px;
    width: 100%;
    min-width: 0;
}

.hero-badge {
    display: inline-flex;
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    margin-bottom: 1.75rem;
}

.badge-text {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.hero-title {
    font-size: clamp(2.25rem, 5vw, 3.25rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.04em;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: clamp(0.95rem, 2vw, 1.15rem);
    color: var(--text-secondary);
    max-width: 580px;
    width: 100%;
    margin: 0 auto 2.5rem auto;
}

/* Copy Terminal Code Box */
.command-box-wrapper {
    max-width: 520px;
    width: 100%;
    min-width: 0;
    margin: 0 auto 2.5rem auto;
}

.command-box {
    display: flex;
    align-items: center;
    background-color: var(--bg-code-block);
    border: 1px solid var(--border-code-block);
    border-radius: 8px;
    padding: 0.7rem 1rem;
    position: relative;
    box-shadow: var(--shadow-sm);
    width: 100%;
    min-width: 0;
}

.command-prompt {
    color: #58A6FF;
    font-family: var(--font-mono);
    font-weight: 700;
    user-select: none;
    margin-right: 0.5rem;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.command-text {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-code-block);
    background: none;
    border: none;
    padding: 0;
    border-radius: 0;
    overflow-x: auto;
    white-space: nowrap;
    text-align: left;
    flex-grow: 1;
    min-width: 0;
    scrollbar-width: none;
}

.command-text::-webkit-scrollbar {
    display: none;
}

.copy-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.4rem;
    border-radius: 4px;
    margin-left: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-speed), color var(--transition-speed);
    position: relative;
}

.copy-btn:hover {
    background-color: rgba(255, 255, 255, 0.08);
    color: var(--text-code-block);
}

.copy-btn svg {
    width: 16px;
    height: 16px;
}

.check-icon {
    display: none;
    color: var(--success-color, #10B981);
}

.copy-btn.copied .copy-icon {
    display: none;
}

.copy-btn.copied .check-icon {
    display: block;
}

/* Tooltip */
.copy-tooltip {
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%) translateY(2px);
    background-color: var(--text-primary);
    color: var(--bg-primary);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 500;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s, transform 0.15s;
    white-space: nowrap;
}

.copy-btn:hover .copy-tooltip {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Hero Action Buttons */
.hero-actions {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.65rem 1.25rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
    min-height: 44px;
    transition: background var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

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

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

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

.btn-secondary:hover {
    background-color: var(--btn-sec-hover);
    border-color: var(--border-hover);
}

.btn-icon {
    width: 16px;
    height: 16px;
}

/* ==========================================================================
   Section Layout General
   ========================================================================== */
.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 3rem auto;
    padding: 0 1rem;
}

.section-title {
    font-size: clamp(1.5rem, 3.5vw, 2rem);
    font-weight: 800;
    margin-bottom: 0.75rem;
    letter-spacing: -0.03em;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   Why I Built This Section
   ========================================================================== */
.why-built-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 5rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.why-built-container {
    display: flex;
    gap: 3rem;
}

.why-built-content {
    flex: 1.2;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    min-width: 0;
}

.why-built-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.65;
}

.why-built-content strong {
    color: var(--text-primary);
}

.why-built-quote {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    border-left: 2px solid var(--text-primary);
    padding-left: 1rem;
    margin-top: 0.5rem;
    letter-spacing: -0.01em;
}

.story-intro {
    font-size: 1.05rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.story-problem, .story-solution {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding-left: 1rem;
    border-left: 2px solid var(--border-color);
}

.story-problem {
    border-left-color: #F85149;
}

.story-solution {
    border-left-color: var(--text-primary);
}

.story-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.story-problem .story-label {
    color: #F85149;
}

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

.command-badge-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.25rem;
}

.command-badge-grid span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    color: var(--text-secondary);
}

.why-built-terminal {
    flex: 0.8;
    align-self: stretch;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.terminal-card {
    background-color: var(--bg-code-block);
    border: 1px solid var(--border-code-block);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-code-block);
}

.terminal-header {
    background-color: rgba(255,255,255,0.03);
    border-bottom: 1px solid var(--border-code-block);
    padding: 0.5rem 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: #30363d;
}

.dot-red { background-color: #f85149; }
.dot-yellow { background-color: #d29922; }
.dot-green { background-color: #3fb950; }

.terminal-title {
    margin-left: auto;
    margin-right: auto;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.terminal-body {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    overflow-x: auto;
}

.term-cmd {
    color: var(--text-code-block);
}

.term-prompt {
    color: #58A6FF;
}

.term-err {
    color: #F85149;
    padding-left: 0.75rem;
    font-size: 0.75rem;
}

.term-line, .term-err {
    white-space: nowrap;
}

/* ==========================================================================
   Installation Guide Section
   ========================================================================== */
.installation-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 5rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.steps-list {
    display: flex;
    flex-direction: column;
    gap: 5rem;
}

.step-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 3rem;
    transition: border-color var(--transition-speed) ease;
}

.step-card:hover {
    border-color: var(--border-hover);
}

.step-card:nth-child(even) {
    flex-direction: row-reverse;
}

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

.step-badge {
    display: inline-flex;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.25rem 0.5rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.step-card-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.step-card-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
}

/* Embedded GitHub Style Code Blocks */
.step-code-wrapper {
    margin-bottom: 1.25rem;
}

.step-code-block {
    background-color: var(--bg-code-block);
    border: 1px solid var(--border-code-block);
    border-radius: 6px;
    padding: 0.6rem 0.9rem;
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
    min-width: 0;
}

.step-code-block code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-code-block);
    background: none;
    border: none;
    padding: 0 2.2rem 0 0;
    border-radius: 0;
    overflow-x: auto;
    white-space: nowrap;
    width: 100%;
    min-width: 0;
}

.step-code-block .copy-btn {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
}

.step-card-visual {
    flex: 1.1;
    display: flex;
    justify-content: center;
    min-width: 0;
}

.step-images-sidebyside {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    width: 100%;
}

.doc-image-wrapper {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    cursor: pointer;
    background-color: var(--bg-secondary);
    transition: transform var(--transition-speed) ease, border-color var(--transition-speed) ease;
}

.doc-image-wrapper:hover {
    transform: scale(1.015);
    border-color: var(--border-hover);
}

.step-doc-img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    aspect-ratio: auto;
}

.zoom-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-speed) ease;
}

.doc-image-wrapper:hover .zoom-overlay {
    opacity: 1;
}

.zoom-icon {
    width: 24px;
    height: 24px;
    color: var(--bg-primary);
}

/* ==========================================================================
   What Gets Configured Section
   ========================================================================== */
.configured-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 5rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.configured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.configured-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition-speed) ease;
}

.configured-card:hover {
    border-color: var(--border-hover);
}

.configured-icon-wrapper {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 6px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.configured-icon {
    width: 18px;
    height: 18px;
}

.configured-card-title {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.configured-card-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ==========================================================================
   Quote & Footer Section
   ========================================================================== */
.quote-section {
    text-align: center;
    max-width: 600px;
    margin: 4rem auto 0 auto;
    padding: 0 1.5rem;
}

.quote-text {
    font-size: 0.95rem;
    font-style: italic;
    color: var(--text-secondary);
    line-height: 1.6;
}

.footer {
    padding: 3rem 1.5rem;
    background-color: var(--bg-primary);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
}

.footer-left {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.footer-text {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.footer-author-link {
    font-weight: 500;
    color: var(--text-primary);
}

.footer-author-link:hover {
    border-bottom: 1px solid var(--text-primary);
}

.footer-right {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.footer-link {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

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

.footer-icon {
    width: 14px;
    height: 14px;
}

/* ==========================================================================
   Lightbox / Modal Components
   ========================================================================== */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    padding: 1.5rem;
}

.lightbox.active {
    opacity: 1;
    pointer-events: auto;
}

.lightbox-close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: none;
    border: none;
    color: #FFFFFF;
    font-size: 2rem;
    font-weight: 300;
    cursor: pointer;
    line-height: 1;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    background-color: rgba(255, 255, 255, 0.1);
    transition: background-color var(--transition-speed);
}

.lightbox-close:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.lightbox-wrapper {
    max-width: 85%;
    max-height: 80%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.lightbox-content {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transform: scale(0.98);
    transition: transform 0.2s ease;
}

.lightbox.active .lightbox-content {
    transform: scale(1);
}

.lightbox-caption {
    margin-top: 1rem;
    color: #A1A1AA;
    font-size: 0.875rem;
    text-align: center;
}

/* ==========================================================================
   Animations & Transitions
   ========================================================================== */
.scroll-animate {
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.scroll-animate.active {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 820px) {
    .why-built-container {
        flex-direction: column;
        gap: 2.5rem;
    }
    
    .why-built-terminal {
        width: 100%;
    }

    .step-card, .step-card:nth-child(even) {
        flex-direction: column;
        gap: 1.75rem;
        padding: 1.5rem;
    }
    
    .step-info-block, .step-card-visual {
        width: 100%;
    }
}

@media (max-width: 768px) {
    .menu-toggle-btn {
        display: flex;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background-color: var(--bg-header);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 1.5rem;
        gap: 1.25rem;
        align-items: stretch;
        box-shadow: var(--shadow-md);
        z-index: 99;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-item {
        padding: 0.5rem 0;
        border-bottom: 1px solid var(--border-color);
        text-align: center;
    }
    
    .github-nav-link {
        justify-content: center;
        border-bottom: none;
        padding: 0.75rem 1.25rem;
    }
}

@media (max-width: 580px) {
    :root {
        --header-height: 56px;
    }
    
    .nav-container {
        padding: 0 1rem;
    }
    
    .logo-text {
        display: none;
    }
    
    .hero-section {
        padding: calc(var(--header-height) + 3rem) 1rem 3rem 1rem;
    }
    
    .hero-title {
        font-size: clamp(1.65rem, 6vw, 2.2rem);
        letter-spacing: -0.03em;
    }
    
    .hero-subtitle {
        font-size: 0.95rem;
    }
    
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .why-built-section,
    .installation-section,
    .configured-section {
        padding: 3rem 1.25rem;
    }
    
    .steps-list {
        gap: 3rem;
    }
    
    .step-card {
        padding: 1.25rem;
    }
    
    .step-images-sidebyside {
        grid-template-columns: 1fr;
    }
    
    .copy-btn {
        padding: 0.75rem;
    }
    
    .terminal-body {
        padding: 0.75rem;
    }
    
    .footer-container {
        flex-direction: column;
        text-align: center;
        align-items: center;
        gap: 1rem;
    }
    
    .footer-right {
        justify-content: center;
    }
}