/* Praxis Engine - Main Stylesheet */
/* Systems Architecture for Governed Intelligence */

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

:root {
    /* Brand Colors - From Style Guide */
    --color-primary: #000000;
    --color-background: #FFFFFF;
    --color-accent: #4FA3A5;

    /* Extended Palette */
    --color-text: #000000;
    --color-text-secondary: #666666;
    --color-text-muted: #888888;
    --color-border: #E5E5E5;
    --color-border-light: #F0F0F0;
    --color-surface: #FAFAFA;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Space Grotesk', 'Inter', sans-serif;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
    --spacing-2xl: 6rem;

    /* Layout */
    --max-width: 1200px;
    --header-height: 72px;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 16px;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.125rem; }

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

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Navigation */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    height: var(--header-height);
}

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

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo img {
    height: 32px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color 0.2s ease;
}

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

.nav-cta {
    background: var(--color-primary);
    color: var(--color-background) !important;
    padding: 0.625rem 1.25rem;
    border-radius: 6px;
    font-weight: 500;
    transition: opacity 0.2s ease;
}

.nav-cta:hover {
    opacity: 0.9;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    font-family: var(--font-primary);
    font-size: 0.9375rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    opacity: 0.9;
}

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

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
}

.hero-content {
    max-width: 720px;
}

.hero-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 560px;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.hero-meta {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* What You Get Section */
.what-you-get {
    padding: var(--spacing-2xl) 0;
    border-top: 1px solid var(--color-border);
}

.section-header {
    margin-bottom: var(--spacing-xl);
}

.section-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.feature-card {
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: border-color 0.2s ease;
}

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

.feature-card h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.125rem;
}

.feature-card p {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
}

/* Three Layers Section */
.three-layers {
    padding: var(--spacing-2xl) 0;
    background: var(--color-surface);
}

.three-layers h2 {
    margin-bottom: var(--spacing-sm);
}

.three-layers > .container > p {
    max-width: 640px;
    margin-bottom: var(--spacing-xl);
}

.layers-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.layer-card {
    background: var(--color-background);
    padding: var(--spacing-lg);
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.layer-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.layer-card h3 {
    margin-bottom: var(--spacing-sm);
}

.layer-card p {
    font-size: 0.9375rem;
}

/* Use Cases Section */
.use-cases {
    padding: var(--spacing-2xl) 0;
    border-top: 1px solid var(--color-border);
}

.use-cases h2 {
    margin-bottom: var(--spacing-xl);
}

.use-case-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.use-case-card {
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
}

.use-case-card h3 {
    margin-bottom: var(--spacing-sm);
}

/* CTA Section */
.cta-section {
    padding: var(--spacing-2xl) 0;
    background: var(--color-primary);
    color: var(--color-background);
    text-align: center;
}

.cta-section h2 {
    color: var(--color-background);
    margin-bottom: var(--spacing-md);
}

.cta-section p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-lg);
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

.cta-section .btn-primary {
    background: var(--color-background);
    color: var(--color-primary);
}

/* Page Hero (for subpages) */
.page-hero {
    padding: calc(var(--header-height) + var(--spacing-2xl)) 0 var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
}

.page-hero h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

/* Footer */
footer {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
}

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

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
}

.footer-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.2s ease;
}

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

.footer-copy {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Responsive */
@media (max-width: 968px) {
    .feature-grid,
    .layers-grid,
    .use-case-grid {
        grid-template-columns: 1fr;
    }

    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
}

@media (max-width: 768px) {
    /* Mobile Menu Toggle Button */
    .menu-toggle {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        width: 44px;
        height: 44px;
        cursor: pointer;
        z-index: 1001;
    }

    .menu-toggle span {
        display: block;
        width: 24px;
        height: 2px;
        background: var(--color-primary);
        transition: all 0.3s ease;
        margin: 3px 0;
    }

    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    /* Mobile Navigation */
    .nav-links {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        max-width: 320px;
        height: 100vh;
        background: var(--color-background);
        padding: calc(var(--header-height) + var(--spacing-lg)) var(--spacing-lg) var(--spacing-lg);
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.1);
        transition: right 0.3s ease;
        gap: 0;
        z-index: 1000;
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links li {
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links li:last-child {
        border-bottom: none;
        margin-top: var(--spacing-md);
    }

    .nav-links a {
        display: block;
        padding: var(--spacing-md) 0;
        font-size: 1.125rem;
    }

    .nav-links .nav-cta {
        text-align: center;
        padding: var(--spacing-md);
    }

    /* Overlay when menu is open */
    body.menu-open::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }

    body.menu-open {
        overflow: hidden;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .page-hero h1 {
        font-size: 2rem;
    }

    .page-hero {
        padding-top: calc(var(--header-height) + var(--spacing-xl));
    }
}

/* Hide menu toggle on desktop */
.menu-toggle {
    display: none;
}

/* ==========================================
   ABOUT PAGE STYLES
   ========================================== */

.about-mission {
    padding: var(--spacing-2xl) 0;
}

.about-content h2 {
    margin-bottom: var(--spacing-lg);
}

.about-content p {
    margin-bottom: var(--spacing-md);
    max-width: 720px;
}

.belief-list {
    list-style: none;
    margin-top: var(--spacing-lg);
}

.belief-list li {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
}

.belief-list li:last-child {
    border-bottom: none;
}

.about-approach {
    padding: var(--spacing-2xl) 0;
    background: var(--color-surface);
}

.about-approach > .container > h2 {
    margin-bottom: var(--spacing-sm);
}

.about-approach > .container > p {
    margin-bottom: var(--spacing-xl);
    max-width: 640px;
}

.approach-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.approach-card {
    background: var(--color-background);
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
}

.approach-card h3 {
    margin-bottom: var(--spacing-sm);
}

.about-values {
    padding: var(--spacing-2xl) 0;
}

.about-values h2 {
    margin-bottom: var(--spacing-xl);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.value-item {
    text-align: center;
}

.value-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.value-item p {
    font-size: 0.9375rem;
}

/* ==========================================
   SOLUTIONS PAGE STYLES
   ========================================== */

.solutions-overview {
    padding: var(--spacing-2xl) 0;
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.solution-card {
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: border-color 0.2s ease;
}

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

.solution-icon {
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.solution-card h3 {
    margin-bottom: var(--spacing-md);
}

.solution-features {
    list-style: none;
    margin: var(--spacing-lg) 0;
    padding-left: 0;
}

.solution-features li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

.solution-features li::before {
    content: "—";
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

.solution-outcome {
    font-size: 0.875rem;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-md);
}

.engagement-models {
    padding: var(--spacing-2xl) 0;
    background: var(--color-surface);
}

.engagement-models > .container > h2 {
    margin-bottom: var(--spacing-sm);
}

.engagement-models > .container > p {
    margin-bottom: var(--spacing-xl);
}

.engagement-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.engagement-card {
    background: var(--color-background);
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
}

.engagement-card h3 {
    margin-bottom: var(--spacing-sm);
}

.engagement-duration {
    display: inline-block;
    margin-top: var(--spacing-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-accent);
}

.process-section {
    padding: var(--spacing-2xl) 0;
}

.process-section h2 {
    margin-bottom: var(--spacing-xl);
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.process-step {
    text-align: center;
}

.step-number {
    display: block;
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-border);
    margin-bottom: var(--spacing-sm);
}

.process-step h3 {
    margin-bottom: var(--spacing-sm);
}

/* ==========================================
   CONTACT PAGE STYLES
   ========================================== */

.contact-section {
    padding: var(--spacing-2xl) 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
}

.contact-info h2 {
    margin-bottom: var(--spacing-md);
}

.contact-info > p {
    margin-bottom: var(--spacing-xl);
}

.contact-methods {
    margin-bottom: var(--spacing-xl);
}

.contact-method {
    margin-bottom: var(--spacing-lg);
}

.contact-method h3 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.contact-method a,
.contact-method p {
    font-size: 1.125rem;
    color: var(--color-text);
    text-decoration: none;
}

.contact-method a:hover {
    color: var(--color-accent);
}

.contact-cta {
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: 8px;
}

.contact-cta h3 {
    margin-bottom: var(--spacing-sm);
}

.contact-cta p {
    margin-bottom: var(--spacing-md);
}

.contact-form-wrapper {
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: 8px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-family: var(--font-primary);
    font-size: 1rem;
    background: var(--color-background);
    transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.btn-full {
    width: 100%;
}

/* ==========================================
   BLOG PAGE STYLES
   ========================================== */

.blog-section {
    padding: var(--spacing-2xl) 0;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.blog-card {
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    transition: border-color 0.2s ease;
}

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

.blog-card-content {
    padding: var(--spacing-lg);
}

.blog-category {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.blog-card h2 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.blog-card h2 a {
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.2s ease;
}

.blog-card h2 a:hover {
    color: var(--color-accent);
}

.blog-card p {
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-md);
}

.blog-meta {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.newsletter-section {
    padding: var(--spacing-2xl) 0;
    background: var(--color-surface);
}

.newsletter-content {
    max-width: 480px;
    margin: 0 auto;
    text-align: center;
}

.newsletter-content h2 {
    margin-bottom: var(--spacing-sm);
}

.newsletter-content p {
    margin-bottom: var(--spacing-lg);
}

.newsletter-form {
    display: flex;
    gap: var(--spacing-sm);
}

.newsletter-form input {
    flex: 1;
    padding: 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-family: var(--font-primary);
    font-size: 1rem;
}

.newsletter-form input:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* ==========================================
   RESPONSIVE - PAGE SPECIFIC
   ========================================== */

@media (max-width: 968px) {
    .approach-grid,
    .solutions-grid,
    .engagement-grid,
    .process-steps {
        grid-template-columns: 1fr;
    }

    .values-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .blog-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .values-grid {
        grid-template-columns: 1fr;
    }

    .newsletter-form {
        flex-direction: column;
    }
}