/* Custom modern dark theme for Whiteout landing page - Reverted to original Master Orange theme */

:root {
    --bg-dark: #070708;
    --bg-card: rgba(18, 18, 20, 0.6);
    --bg-card-border: rgba(255, 255, 255, 0.05);
    
    /* Branding Accent Color: Original master orange colors */
    --accent-primary: #ff7600;
    --accent-hover: #ff8e26;
    --accent-light: rgba(255, 118, 0, 0.1);
    
    --yellow-secondary: #ffb800;
    --yellow-light: rgba(255, 184, 0, 0.1);
    
    --text-primary: #f4f4f5;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-display: 'Outfit', var(--font-sans);
    --font-mono: 'JetBrains Mono', sfmono-regular, Consolas, Menlo, monospace;
    
    --container-width: 1100px;
    --border-radius-lg: 16px;
    --border-radius-md: 10px;
    --border-radius-sm: 6px;
    
    --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset and base styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-sans);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Bilingual content switching */
html[lang="en"] .lang-ko { display: none !important; }
html[lang="ko"] .lang-en { display: none !important; }

body {
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
}

p {
    color: var(--text-secondary);
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Badge styling */
.badge {
    display: inline-block;
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 20px;
    font-size: 11.5px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 20px;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
    background: #27272a;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: #3f3f46;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(7, 7, 8, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
    height: 70px;
    transition: var(--transition-smooth);
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 800;
    color: var(--text-primary);
}

.logo-icon {
    width: 26px;
    height: 26px;
    color: var(--accent-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 30px;
    font-size: 14px;
    font-weight: 500;
}

.nav-links a {
    color: var(--text-secondary);
    transition: var(--transition-smooth);
}

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

/* Language selector on header navbar */
.site-lang-switch {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 4px 10px;
}

.site-lang-btn {
    background: transparent;
    border: none;
    font-family: var(--font-sans);
    font-size: 11px;
    font-weight: 700;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition-smooth);
    padding: 2px 4px;
}

.site-lang-btn.active {
    color: var(--accent-primary);
}

.site-lang-btn:hover:not(.active) {
    color: var(--text-primary);
}

.site-lang-divider {
    font-size: 10px;
    color: rgba(255, 255, 255, 0.1);
}

.github-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 30px;
    color: var(--text-primary) !important;
}

.github-link:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.15);
}

/* Hero Section */
.hero {
    position: relative;
    padding-top: 150px;
    padding-bottom: 100px;
    overflow: hidden;
}

/* Ambient gradient background blobs */
.hero-bg-gradients {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.gradient-blob {
    position: absolute;
    width: 450px;
    height: 450px;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
}

.gradient-blob.orange {
    top: -100px;
    right: 15%;
    background: var(--accent-primary);
}

.gradient-blob.yellow {
    bottom: -50px;
    left: 10%;
    background: var(--yellow-secondary);
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text {
    max-width: 620px;
}

.hero-title {
    font-size: 52px;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
    line-height: 1.1;
}

.highlight-text {
    background: linear-gradient(135deg, var(--accent-primary), var(--yellow-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 18px;
    margin-bottom: 36px;
    line-height: 1.7;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 30px;
}

/* Button styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 15px;
    border-radius: 30px;
    transition: var(--transition-smooth);
    cursor: pointer;
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
    box-shadow: 0 10px 20px rgba(255, 118, 0, 0.15);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(255, 118, 0, 0.25);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

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

.app-meta {
    display: flex;
    gap: 12px;
    font-size: 12.5px;
    color: var(--text-muted);
}

/* Hero App Preview Window */
.hero-preview {
    display: flex;
    justify-content: center;
}

.mac-window {
    width: 320px;
    background: rgba(24, 24, 27, 0.55);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border: 1px solid var(--bg-card-border);
    border-radius: 12px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

.mac-header {
    background: rgba(255, 255, 255, 0.03);
    padding: 10px 14px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.mac-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 6px;
}

.mac-dot.red { background: #ff5f56; }
.mac-dot.yellow { background: #ffbd2e; }
.mac-dot.green { background: #27c93f; }

.mac-title {
    margin: 0 auto;
    font-size: 10px;
    color: var(--text-muted);
    font-family: var(--font-mono);
    transform: translateX(-15px); /* Balance the dots */
}

/* App Mockup UI styling matching swift ui popover with original orange theme */
.app-popover-ui {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
}

.ui-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-row {
    gap: 12px;
}

.ui-icon-box {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

.ui-icon-box.enabled {
    background: var(--accent-light);
    color: var(--accent-primary);
}

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

.ui-text-column {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.ui-title {
    font-size: 13px;
    font-weight: 600;
}

.ui-subtitle {
    font-size: 10.5px;
    color: var(--text-muted);
}

.ui-subtitle.status-text {
    color: var(--accent-primary);
}

.ui-toggle {
    width: 38px;
    height: 22px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 11px;
    position: relative;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.ui-toggle.active {
    background: var(--accent-primary);
}

.ui-toggle-thumb {
    width: 18px;
    height: 18px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    transition: var(--transition-smooth);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

.ui-toggle.active .ui-toggle-thumb {
    left: 18px;
}

.ui-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.06);
}

.ui-section {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.section-label {
    font-size: 11.5px;
    font-weight: 500;
    color: var(--text-primary);
}

.slider-value {
    font-size: 11.5px;
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--accent-primary);
}

.ui-slider-container {
    height: 14px;
    display: flex;
    align-items: center;
}

.ui-slider-track {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 2px;
    position: relative;
}

.ui-slider-fill {
    height: 100%;
    background: var(--accent-primary);
    border-radius: 2px;
}

.ui-slider-thumb {
    width: 14px;
    height: 14px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: -5px;
    transform: translateX(-50%);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.ui-visualizer-bar {
    height: 16px;
    background: linear-gradient(to right, black, white);
    border-radius: 4px;
    position: relative;
    overflow: visible;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.dimmed-overlay {
    position: absolute;
    right: 0;
    height: 100%;
    background: rgba(120, 120, 120, 0.7);
    border-radius: 0 4px 4px 0;
}

.orange-marker {
    position: absolute;
    width: 2px;
    height: 100%;
    background: var(--accent-primary);
    transform: translateX(-50%);
}

.orange-triangle {
    position: absolute;
    width: 0;
    height: 0;
    border-left: 3.5px solid transparent;
    border-right: 3.5px solid transparent;
    border-bottom: 4px solid var(--accent-primary);
    bottom: -4px;
    transform: translateX(-50%);
}

.footer-info {
    font-size: 9.5px;
}

.info-green { color: #34c759; font-weight: 500; }
.info-gray { color: var(--text-muted); }

.exponent-label {
    font-size: 11px;
    font-family: var(--font-mono);
    color: var(--accent-primary);
    font-weight: 600;
}

.ui-segmented-control {
    background: rgba(255, 255, 255, 0.04);
    padding: 3px;
    border-radius: 6px;
    display: flex;
    gap: 4px;
}

.segment {
    flex: 1;
    text-align: center;
    font-size: 10px;
    padding: 5px 0;
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.segment.active {
    background: var(--accent-primary);
    color: black;
    font-weight: 600;
}

/* Mini option switchers */
.opt-row {
    gap: 6px !important;
}

.opt-label {
    font-size: 11px;
    color: var(--text-secondary);
}

.ui-switch {
    width: 32px;
    height: 18px;
    background: rgba(255, 255, 255, 0.12);
    border-radius: 9px;
    position: relative;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.ui-switch.active {
    background: var(--accent-primary);
}

.ui-switch-thumb {
    width: 14px;
    height: 14px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    transition: var(--transition-smooth);
}

.ui-switch.active .ui-switch-thumb {
    left: 16px;
}

/* Popover Footer elements */
.popover-footer {
    font-size: 9.5px;
    font-weight: 600;
    color: var(--text-muted);
}

.popover-lang-switch {
    display: flex;
    align-items: center;
    gap: 4px;
}

.popover-lang {
    cursor: pointer;
    transition: var(--transition-smooth);
    padding: 1px 3px;
}

.popover-lang.active {
    color: var(--accent-primary);
}

.popover-lang-slash {
    color: rgba(255, 255, 255, 0.1);
}

.popover-quit-btn {
    cursor: pointer;
    transition: var(--transition-smooth);
}

.popover-quit-btn:hover {
    color: var(--text-primary);
}


/* Section 1: How It Works & Comparison */
.how-it-works {
    background: #0c0c0e;
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px auto;
}

.section-header h2 {
    font-size: 38px;
    letter-spacing: -0.01em;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 16px;
}

.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 60px;
}

.comparison-card {
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.card-badge {
    align-self: flex-start;
    padding: 4px 10px;
    font-size: 10.5px;
    font-weight: 700;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-red {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.badge-orange {
    background: var(--accent-light);
    color: var(--accent-primary);
    border: 1px solid rgba(255, 118, 0, 0.2);
}

.comparison-card h3 {
    font-size: 24px;
}

.screen-simulator {
    height: 180px;
    border-radius: var(--border-radius-md);
    margin-top: 10px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

/* Simulated screen styles */
.overlay-sim {
    background: #9ca3af; /* Overlay makes background look grey */
}

.overlay-sim .sim-content {
    filter: opacity(0.6); /* simulate transparent overlay */
}

.whiteout-sim {
    background: #e4e4e7; /* Dimmed background, but elements remain high contrast */
}

.sim-bg-title {
    font-family: var(--font-display);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 12px;
    display: block;
}

.txt-primary {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 4px;
}

.overlay-sim .txt-primary {
    color: #4b5563; /* black text gets washed out and greyed */
}

.whiteout-sim .txt-primary {
    color: #000000; /* true solid black text */
}

.txt-secondary {
    font-size: 12px;
    margin-bottom: 16px;
}

.overlay-sim .txt-secondary {
    color: #6b7280;
}

.whiteout-sim .txt-secondary {
    color: #27272a;
}

.sim-contrast-badge {
    align-self: flex-start;
    padding: 4px 8px;
    font-size: 11px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(4px);
    color: #000000;
}

/* Interactive Split-Screen Slider Widget */
.interactive-slider-section {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    margin-top: 40px;
    text-align: center;
}

.interactive-slider-section h3 {
    font-size: 22px;
    margin-bottom: 8px;
}

.slider-helper {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

/* Container for comparison screens */
.comparison-container {
    position: relative;
    width: 100%;
    height: 350px;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    user-select: none;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.side {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.simulated-screen {
    width: 100%;
    height: 100%;
    padding: 50px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    text-align: left;
}

/* Left side (Overlay filter): transparent black overlay */
.before-side {
    z-index: 2;
    width: 50%; /* JS will control this */
    border-right: 1px solid rgba(255,255,255,0.1);
}

.before-side .simulated-screen {
    width: 100%; /* must enforce full layout size even when width is clipped */
}

.overlay-dimmed {
    background: #ffffff;
    position: relative;
}

.overlay-dimmed::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.45); /* 45% overlay window */
    pointer-events: none;
}

/* Right side (Whiteout dimming): bright white compressed, black stays pure */
.after-side {
    z-index: 1;
}

.after-side .simulated-screen {
    width: 100%;
}

.whiteout-dimmed {
    background: #c5c5c9; /* Background scaled down to 77% brightness */
}

/* Text elements inside screen simulated panels */
.screen-text-content {
    max-width: 500px;
}

.screen-text-content h4 {
    font-size: 16px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 20px;
}

.overlay-dimmed h4 { color: #888888; }
.whiteout-dimmed h4 { color: #66666a; }

.text-white-bg {
    font-size: 26px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 12px;
}

.overlay-dimmed .text-white-bg { color: #ffffff; } /* inside overlay, color looks grey due to black filter */
.whiteout-dimmed .text-white-bg { color: #111111; } /* bright grey background */

.text-black-fg {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 24px;
}

.text-faded {
    color: #000000; /* overlay will darken this black text into muddy grey */
}

.text-pure-black {
    color: #000000; /* true contrast */
}

.contrast-pill {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.contrast-pill.bad {
    background: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.contrast-pill.good {
    background: rgba(52, 199, 89, 0.2);
    color: #a7f3d0;
    border: 1px solid rgba(52, 199, 89, 0.3);
}

/* Slider center handle */
.slider-handle {
    position: absolute;
    top: 0;
    left: 50%; /* JS will control */
    height: 100%;
    width: 2px;
    background: var(--accent-primary);
    z-index: 3;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: ew-resize;
    transform: translateX(-50%);
}

.handle-line {
    flex-grow: 1;
    width: 1px;
    background: var(--accent-primary);
    opacity: 0.5;
}

.handle-button {
    width: 40px;
    height: 40px;
    background: var(--accent-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: black;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
    border: 2px solid white;
}


/* Section 2: Curve Details & Live Visualizer */
.curve-details {
    padding: 100px 0;
}

.curve-split-grid {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 60px;
    align-items: center;
}

.curve-info-panel {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* Exponents Explainer list */
.presets-explainer {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.presets-explainer h3 {
    font-size: 20px;
    margin-bottom: 4px;
}

.preset-item {
    display: flex;
    gap: 16px;
    padding: 16px;
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.preset-item:hover, .preset-item.active {
    border-color: rgba(255, 118, 0, 0.3);
    background: rgba(255, 118, 0, 0.03);
}

.preset-badge {
    align-self: flex-start;
    padding: 6px 12px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 13px;
    min-width: 75px;
    text-align: center;
}

.preset-badge.orange {
    background: var(--accent-light);
    color: var(--accent-primary);
    border: 1px solid rgba(255, 118, 0, 0.2);
}

.preset-badge.platinum {
    background: var(--yellow-light);
    color: var(--yellow-secondary);
    border: 1px solid rgba(255, 184, 0, 0.2);
}

.preset-badge.dark {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.preset-desc {
    font-size: 13.5px;
    line-height: 1.5;
}

.preset-desc strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: 2px;
}

/* Live visualizer Panel */
.curve-visualizer-panel {
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    box-shadow: 0 30px 60px rgba(0,0,0,0.4);
}

.graph-header {
    margin-bottom: 24px;
}

.graph-header h3 {
    font-size: 20px;
    margin-bottom: 4px;
}

.graph-header p {
    font-size: 13px;
    color: var(--text-muted);
}

.canvas-wrapper {
    background: #000000;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    aspect-ratio: 580 / 220;
    position: relative;
}

#live-curve-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.graph-controls {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.control-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.control-header label {
    font-size: 13.5px;
    font-weight: 600;
    color: var(--text-secondary);
}

.control-value {
    font-family: var(--font-mono);
    font-weight: 700;
    color: var(--accent-primary);
    font-size: 14px;
}

/* Range input customization */
input[type=range] {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
}

input[type=range]:focus {
    outline: none;
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 6px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

input[type=range]::-webkit-slider-thumb {
    height: 18px;
    width: 18px;
    border-radius: 50%;
    background: var(--accent-primary);
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -6px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.5);
    transition: var(--transition-smooth);
}

input[type=range]::-webkit-slider-thumb:hover {
    background: var(--accent-hover);
    transform: scale(1.1);
}

.slider-ticks {
    display: flex;
    justify-content: space-between;
    font-size: 10.5px;
    color: var(--text-muted);
    font-family: var(--font-mono);
    padding: 0 4px;
}

/* Exponents 3-way toggle buttons */
.preset-buttons-group {
    display: flex;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-sm);
    padding: 4px;
}

.btn-preset {
    flex: 1;
    background: transparent;
    border: none;
    padding: 10px 0;
    font-family: var(--font-sans);
    font-size: 12.5px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-preset:hover {
    color: var(--text-primary);
}

.btn-preset.active {
    background: var(--accent-primary);
    color: black;
    font-weight: 600;
}


/* Section 3: Feature Matrix */
.features {
    background: #0c0c0e;
    padding: 100px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.02);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-tile {
    background: var(--bg-card);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--border-radius-md);
    padding: 30px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: var(--transition-smooth);
}

.feature-tile:hover {
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.3);
}

.tile-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--border-radius-sm);
    background: var(--accent-light);
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.tile-icon svg {
    width: 22px;
    height: 22px;
}

.feature-tile h3 {
    font-size: 18px;
}

.feature-tile p {
    font-size: 14px;
}


/* Footer Section */
.footer {
    background: var(--bg-dark);
    padding: 80px 0 40px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.03);
}

.footer-container {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 80px;
    margin-bottom: 60px;
}

.footer-info h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.footer-info p {
    max-width: 400px;
    font-size: 14px;
    margin-bottom: 16px;
}

.footer-info .license {
    font-size: 12px;
    color: var(--text-muted);
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.link-group h4 {
    font-size: 13.5px;
    color: var(--text-primary);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.link-group a {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    transition: var(--transition-smooth);
}

.link-group a:hover {
    color: var(--accent-primary);
}

/* Gatekeeper box styling */
.gatekeeper-box {
    background: rgba(239, 68, 68, 0.02);
    border: 1px solid rgba(239, 68, 68, 0.12);
    border-radius: var(--border-radius-md);
    padding: 30px;
    margin-bottom: 40px;
    display: none; /* expanded on click */
}

.gatekeeper-box.visible {
    display: block;
    animation: slideDown 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.gatekeeper-box h4 {
    color: #fca5a5;
    font-size: 16px;
    margin-bottom: 12px;
}

.gatekeeper-box p {
    font-size: 14px;
    margin-bottom: 16px;
}

.code-instructions {
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--border-radius-sm);
    padding: 20px;
    border: 1px solid rgba(255, 255, 255, 0.03);
}

.divider-text {
    font-size: 11px;
    color: var(--text-muted);
    font-family: var(--font-mono);
    text-transform: uppercase;
    margin: 12px 0;
    position: relative;
    text-align: center;
}

.divider-text::before, .divider-text::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 40%;
    height: 1px;
    background: rgba(255,255,255,0.05);
}

.divider-text::before { left: 0; }
.divider-text::after { right: 0; }

.gatekeeper-box pre {
    background: #000000;
    padding: 12px;
    border-radius: 4px;
    border: 1px solid rgba(255,255,255,0.08);
    font-family: var(--font-mono);
    font-size: 12px;
    overflow-x: auto;
    color: #ff9d00;
}

.copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.03);
    padding-top: 30px;
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
}

/* Animations */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive design styles */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    .hero-text {
        max-width: 100%;
    }
    .cta-buttons {
        justify-content: center;
    }
    .app-meta {
        justify-content: center;
    }
    .curve-split-grid {
        grid-template-columns: 1fr;
        gap: 50px;
    }
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 40px;
    }
    .comparison-grid {
        grid-template-columns: 1fr;
    }
    .features-grid {
        grid-template-columns: 1fr;
    }
    .footer-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .interactive-slider-section {
        padding: 24px 16px;
    }
    .simulated-screen {
        padding: 24px;
    }
}