:root {
    /* Colors based on Mentzer Design Tokens */
    --bg-base: #0A0A0A;
    --bg-surface: #141414;
    --bg-elevated: #1C1C1C;
    
    --border-color: #2A2A2A;
    
    --text-primary: #FFFFFF;
    --text-secondary: #666666;
    --text-tertiary: #444444;
    
    --accent-green: #1A5C38;
    --success-green: #2A8A55;
    --error-red: #CC3333;

    /* Typography Defaults - using closest Google Fonts matches as fallbacks */
    --font-heading: 'Syne', sans-serif; /* Fallback for Monument Extended */
    --font-body: 'Jost', sans-serif;    /* Fallback for Glacial Indifference */
    
    /* Spacing Grid */
    --space-1: 8px;
    --space-2: 16px;
    --space-3: 24px;
    --space-4: 32px;
    --space-6: 48px;
    --space-8: 64px;
    --space-12: 96px;
}

/* Global Reset & Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography Classes */
h1, h2, h3, h4, h5, h6, .brand-name, .btn-primary, .btn-secondary, .btn-primary-small, .mockup-title, .feature-title, .section-title, .mockup-btn {
    font-family: var(--font-heading);
    text-transform: uppercase;
    letter-spacing: -0.02em;
    font-weight: 800;
}

a {
    text-decoration: none;
    color: inherit;
    transition: opacity 0.2s ease;
}

a:hover {
    opacity: 0.8;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3) var(--space-6);
    border-bottom: 1px solid var(--border-color);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.logo {
    height: 32px;
    width: auto;
    filter: invert(1); /* Ensure black logo turns white on dark bg */
}

.brand-name {
    font-size: 1.2rem;
    letter-spacing: 0.1em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.nav-link {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

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

/* Buttons */
.btn-primary, .btn-primary-small {
    background-color: var(--accent-green);
    color: var(--text-primary);
    display: inline-block;
    border: none;
    cursor: pointer;
    text-align: center;
    /* Sharp corners only */
    border-radius: 0;
}

.btn-primary {
    padding: var(--space-2) var(--space-4);
    font-size: 1rem;
}

.btn-primary-small {
    padding: var(--space-1) var(--space-2);
    font-size: 0.8rem;
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: var(--space-2) var(--space-4);
    font-size: 1rem;
    border-radius: 0;
    display: inline-block;
    text-align: center;
}

.btn-secondary:hover {
    background-color: var(--bg-surface);
}

/* Hero Section */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
    padding: var(--space-12) var(--space-6);
    min-height: 80vh;
    align-items: center;
}

.hero-label {
    font-family: var(--font-body);
    color: var(--accent-green);
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-2);
    text-transform: uppercase;
    font-weight: 700;
}

.headline {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: var(--space-3);
}

.subtext {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
    max-width: 480px;
}

.cta-group {
    display: flex;
    gap: var(--space-2);
}

/* App Mockup Visual */
.hero-visual {
    display: flex;
    justify-content: center;
}

.app-mockup {
    width: 340px;
    background-color: var(--bg-base);
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}

.mockup-header {
    text-align: center;
    padding: var(--space-2);
    border-bottom: 1px solid var(--border-color);
}

.mockup-title {
    font-size: 0.8rem;
    color: var(--text-primary);
}

.mockup-chat {
    padding: var(--space-3);
    min-height: 400px;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    background-color: var(--bg-base);
}

.chat-bubble {
    padding: var(--space-2);
    font-family: var(--font-body);
    font-size: 0.9rem;
    border-radius: 0; /* Sharp corners */
}

.chat-bubble.user {
    align-self: flex-end;
    background-color: var(--bg-elevated);
    max-width: 80%;
}

.chat-bubble.ai {
    align-self: flex-start;
    border: 1px solid var(--border-color);
    width: 100%;
}

.ai-header {
    margin-bottom: var(--space-2);
}

.food-name {
    font-weight: 700;
    color: var(--text-primary);
}

.macro-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-1);
    margin-bottom: var(--space-2);
}

.macro-stat {
    display: flex;
    flex-direction: column;
}

.macro-label {
    font-family: var(--font-heading);
    font-size: 0.5rem;
    color: var(--text-secondary);
}

.macro-value {
    font-weight: 700;
    color: var(--text-primary);
}

.mockup-btn {
    width: 100%;
    background-color: var(--accent-green);
    color: var(--text-primary);
    border: none;
    padding: var(--space-1);
    font-size: 0.8rem;
    cursor: pointer;
}

.mockup-input {
    padding: var(--space-2);
    border-top: 1px solid var(--border-color);
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

/* Features Section */
.features-section {
    padding: var(--space-12) var(--space-6);
    background-color: var(--bg-base);
    border-top: 1px solid var(--border-color);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.section-title {
    font-size: 2rem;
    margin-bottom: var(--space-1);
}

.section-subtext {
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
}

.feature-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: var(--space-4);
}

.feature-icon {
    color: var(--accent-green);
    margin-bottom: var(--space-3);
}

.feature-title {
    font-size: 1rem;
    margin-bottom: var(--space-2);
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Bottom CTA */
.bottom-cta {
    padding: var(--space-12) var(--space-6);
    text-align: center;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-surface);
}

.cta-headline {
    font-size: 2.5rem;
    margin-bottom: var(--space-2);
}

.cta-subtext {
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
}

/* Footer */
.footer {
    padding: var(--space-4) var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
}

.footer-logo {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

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

/* Responsive */
@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-6);
    }
    
    .cta-group {
        justify-content: center;
    }
    
    .subtext {
        margin: 0 auto var(--space-4);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-links {
        display: none; /* Hide on mobile for simplicity in MVP */
    }
}

@media (max-width: 600px) {
    .headline {
        font-size: 2.5rem;
    }
    
    .hero, .features-section, .bottom-cta {
        padding-left: var(--space-3);
        padding-right: var(--space-3);
    }
    
    .cta-group {
        flex-direction: column;
    }
}