/* =====================================================
   CSS Variables - Humanist Modernism Palette
   ===================================================== */
:root {
    /* Color variables - Warm, Human-Centered */
    --color-primary: #2a2a2a;
    --color-secondary: #f9f7f2;
    --color-accent: #d97706;
    --color-text: #2a2a2a;
    --color-text-light: #555555;
    --color-bg: #f9f7f2;
    --color-bg-alt: #ffffff;
    
    /* Font variables - Humanist Sans-Serif */
    --font-primary: 'Open Sans', 'Segoe UI', 'Trebuchet MS', sans-serif;
    --font-secondary: 'Georgia', 'Garamond', serif;
    
    /* Fluid font sizing with clamp() */
    --font-size-h1: clamp(2.5rem, 6vw, 4rem);
    --font-size-h2: clamp(1.75rem, 4.5vw, 2.8rem);
    --font-size-h3: clamp(1.25rem, 3vw, 1.6rem);
    --font-size-body: clamp(0.95rem, 2vw, 1.1rem);
    --font-size-small: clamp(0.85rem, 1.5vw, 0.95rem);
    
    /* Spacing variables */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Line height - Humanist emphasis on legibility */
    --line-height-body: 1.7;
    --line-height-heading: 1.3;
    
    /* Transition variables */
    --transition-fast: 0.2s ease-in-out;
    --transition-smooth: 0.4s ease-in-out;
    --transition-slow: 0.8s ease-in-out;
}

/* =====================================================
   Global Styles
   ===================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: var(--line-height-body);
}

/* 12-Column CSS Grid Container */
.container {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* =====================================================
   Skip to Content Link
   ===================================================== */
.skip-to-content {
    position: absolute;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    width: 1px;
    height: 1px;
    overflow: hidden;
    z-index: 999;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-primary);
    color: var(--color-secondary);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
}

.skip-to-content:focus {
    clip: auto;
    width: auto;
    height: auto;
    overflow: visible;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
}

/* =====================================================
   Hero Header
   ===================================================== */
.hero-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, #3d3d3d 100%);
    color: var(--color-secondary);
    padding: var(--spacing-xxl) 0;
    text-align: center;
}

.hero-header .container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
}

.hero-header h1 {
    font-family: var(--font-primary);
    font-size: var(--font-size-h1);
    font-weight: 600;
    letter-spacing: 0.03em;
    line-height: var(--line-height-heading);
    text-transform: uppercase;
    margin: 0;
}

.hero-subtitle {
    font-size: var(--font-size-body);
    font-weight: 400;
    letter-spacing: 0.08em;
    max-width: 600px;
    opacity: 0.92;
    margin: 0;
    line-height: var(--line-height-body);
}

/* =====================================================
   Main Content
   ===================================================== */
main {
    background-color: var(--color-bg);
}

/* =====================================================
   Section Header Styles
   ===================================================== */
.section-header {
    grid-column: span 12;
    margin-bottom: var(--spacing-xxl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid rgba(42, 42, 42, 0.15);
}

.section-header h2 {
    font-family: var(--font-primary);
    font-size: var(--font-size-h2);
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--color-primary);
    text-transform: uppercase;
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-heading);
}

.section-intro {
    font-size: var(--font-size-body);
    color: var(--color-text-light);
    font-weight: 400;
    letter-spacing: 0.05em;
    margin: 0;
    line-height: var(--line-height-body);
}

/* =====================================================
   Organic Geometry Section
   ===================================================== */
.organic-geometry-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-bg);
}

.geometry-content {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--spacing-xxl);
    grid-column: span 12;
}

.geometry-left {
    grid-column: span 6;
}

.geometry-right {
    grid-column: span 6;
}

.geometry-left h3,
.geometry-right h3 {
    font-family: var(--font-primary);
    font-size: var(--font-size-h3);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.01em;
    line-height: var(--line-height-heading);
}

.geometry-left p,
.geometry-right p {
    font-size: var(--font-size-body);
    color: var(--color-text-light);
    line-height: var(--line-height-body);
    margin-bottom: var(--spacing-lg);
}

.geometry-left p:first-of-type,
.geometry-right p:first-of-type {
    color: var(--color-text);
    font-weight: 500;
}

/* =====================================================
   Human-Centered Clarity Section
   ===================================================== */
.clarity-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-bg-alt);
}

.clarity-content {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--spacing-xxl);
    grid-column: span 12;
}

.clarity-card {
    grid-column: span 4;
    padding: var(--spacing-xxl);
    background-color: var(--color-bg);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(42, 42, 42, 0.08);
    transition: all var(--transition-smooth);
}

.clarity-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 28px rgba(42, 42, 42, 0.12);
}

.clarity-card h3 {
    font-family: var(--font-primary);
    font-size: var(--font-size-h3);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.01em;
    line-height: var(--line-height-heading);
}

.clarity-card p {
    font-size: var(--font-size-body);
    color: var(--color-text-light);
    line-height: var(--line-height-body);
    margin-bottom: var(--spacing-md);
}

.clarity-card p:first-child {
    color: var(--color-text);
    font-weight: 500;
}

.clarity-card p:last-child {
    margin-bottom: 0;
}

/* =====================================================
   Gallery Section
   ===================================================== */
.gallery-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-bg);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--spacing-xxl);
    grid-column: span 12;
}

.gallery-item {
    grid-column: span 6;
    display: flex;
    flex-direction: column;
    margin: 0;
    transition: all var(--transition-smooth);
}

.gallery-item:hover {
    transform: translateY(-8px);
}

.gallery-image {
    width: 100%;
    height: 400px;
    object-fit: cover;
    object-position: center;
    border-radius: 8px;
    margin-bottom: var(--spacing-lg);
    box-shadow: 0 8px 24px rgba(42, 42, 42, 0.12);
    transition: all var(--transition-smooth);
    display: block;
}

.gallery-item:hover .gallery-image {
    box-shadow: 0 16px 40px rgba(217, 119, 6, 0.15);
}

.gallery-item figcaption {
    padding: 0;
}

.gallery-item h3 {
    font-family: var(--font-primary);
    font-size: var(--font-size-h3);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.01em;
    line-height: var(--line-height-heading);
}

.gallery-item p {
    font-size: var(--font-size-body);
    color: var(--color-text-light);
    line-height: var(--line-height-body);
    margin: 0;
}

/* =====================================================
   Modern Legacy Section - Asymmetrical Layout
   ===================================================== */
.legacy-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-bg-alt);
}

.legacy-content {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--spacing-xxl);
    grid-column: span 12;
}

/* Asymmetrical column spans: 4, 5, 3 */
.legacy-left {
    grid-column: span 4;
    padding: var(--spacing-xxl);
    background-color: var(--color-bg);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(42, 42, 42, 0.08);
    transition: all var(--transition-smooth);
}

.legacy-center {
    grid-column: span 5;
    padding: var(--spacing-xxl);
    background-color: var(--color-bg);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(42, 42, 42, 0.08);
    transition: all var(--transition-smooth);
    border-left: 4px solid var(--color-accent);
}

.legacy-right {
    grid-column: span 3;
    padding: var(--spacing-xxl);
    background-color: var(--color-bg);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(42, 42, 42, 0.08);
    transition: all var(--transition-smooth);
}

.legacy-left:hover,
.legacy-center:hover,
.legacy-right:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 28px rgba(42, 42, 42, 0.12);
}

.legacy-left h3,
.legacy-center h3,
.legacy-right h3 {
    font-family: var(--font-primary);
    font-size: var(--font-size-h3);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.01em;
    line-height: var(--line-height-heading);
}

.legacy-left p,
.legacy-center p,
.legacy-right p {
    font-size: var(--font-size-body);
    color: var(--color-text-light);
    line-height: var(--line-height-body);
    margin-bottom: var(--spacing-md);
}

.legacy-left p:first-of-type,
.legacy-center p:first-of-type,
.legacy-right p:first-of-type {
    color: var(--color-text);
    font-weight: 500;
}

.legacy-left p:last-child,
.legacy-center p:last-child,
.legacy-right p:last-child {
    margin-bottom: 0;
}

/* =====================================================
   Core Principles Section
   ===================================================== */
.principles-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-bg);
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--spacing-lg);
    grid-column: span 12;
}

.principle-card {
    grid-column: span 4;
    padding: var(--spacing-xl);
    background-color: var(--color-bg-alt);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(42, 42, 42, 0.08);
    border-top: 4px solid var(--color-accent);
    transition: all var(--transition-smooth);
    text-align: center;
}

.principle-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 28px rgba(42, 42, 42, 0.12);
}

.principle-card h3 {
    font-family: var(--font-primary);
    font-size: var(--font-size-h3);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.01em;
    line-height: var(--line-height-heading);
}

.principle-card p {
    font-size: var(--font-size-body);
    color: var(--color-text-light);
    line-height: var(--line-height-body);
    margin: 0;
}

/* =====================================================
   Footer
   ===================================================== */
.design-footer {
    background-color: var(--color-primary);
    color: var(--color-secondary);
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-xxl);
}

.design-footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
    width: 100%;
}

.design-footer p {
    font-size: var(--font-size-small);
    color: rgba(249, 247, 242, 0.85);
    margin: 0;
    line-height: var(--line-height-body);
}

.footer-nav {
    display: flex;
    gap: var(--spacing-lg);
}

.back-to-hub {
    color: var(--color-secondary);
    text-decoration: none;
    font-size: var(--font-size-small);
    font-weight: 500;
    letter-spacing: 0.05em;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 1px solid var(--color-secondary);
    border-radius: 8px;
    transition: all var(--transition-fast);
    line-height: var(--line-height-body);
}

.back-to-hub:hover {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-primary);
    transform: translateY(-2px);
}

/* =====================================================
   Animations - Fade-in-up with Intersection Observer
   ===================================================== */
section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow) ease-out,
                transform var(--transition-slow) ease-out;
}

section.visible {
    opacity: 1;
    transform: translateY(0);
}

/* =====================================================
   Responsive Design
   ===================================================== */
@media (max-width: 1024px) {
    .geometry-left {
        grid-column: span 12;
    }

    .geometry-right {
        grid-column: span 12;
    }

    .clarity-card {
        grid-column: span 6;
    }

    .gallery-item {
        grid-column: span 12;
    }

    .gallery-image {
        height: 300px;
    }

    .legacy-left {
        grid-column: span 12;
    }

    .legacy-center {
        grid-column: span 12;
        border-left: none;
        border-top: 4px solid var(--color-accent);
    }

    .legacy-right {
        grid-column: span 12;
    }

    .principle-card {
        grid-column: span 6;
    }
}

@media (max-width: 768px) {
    .container {
        gap: var(--spacing-md);
        padding: 0 var(--spacing-md);
    }

    .hero-header h1 {
        font-size: clamp(1.75rem, 4vw, 2.5rem);
    }

    .hero-subtitle {
        font-size: var(--font-size-small);
    }

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

    .section-header h2 {
        font-size: clamp(1.25rem, 3vw, 1.8rem);
    }

    .organic-geometry-section,
    .clarity-section,
    .gallery-section,
    .legacy-section,
    .principles-section {
        padding: var(--spacing-xl) 0;
    }

    .clarity-card {
        grid-column: span 12;
    }

    .principle-card {
        grid-column: span 12;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-nav {
        justify-content: center;
        width: 100%;
    }
}

@media (max-width: 480px) {
    .hero-header {
        padding: var(--spacing-xl) 0;
    }

    .hero-header h1 {
        font-size: clamp(1.25rem, 3vw, 1.75rem);
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .geometry-content,
    .clarity-content,
    .gallery-grid,
    .legacy-content,
    .principles-grid {
        gap: var(--spacing-lg);
    }

    .clarity-card,
    .principle-card,
    .legacy-left,
    .legacy-center,
    .legacy-right {
        padding: var(--spacing-lg);
    }

    .section-header h2 {
        font-size: clamp(1rem, 2.5vw, 1.4rem);
    }

    .gallery-image {
        height: 200px;
    }

    .back-to-hub {
        width: 100%;
        text-align: center;
    }

    .design-footer p,
    .footer-nav {
        width: 100%;
    }
}