/* Certes Institute - Variant 1a: Deep Purple & Forest Green Dark Mode (10% Lighter) */
/* WCAG Contrast Notes included for key combinations */

/* CSS Custom Properties */
:root {
    /* Primary Colors - Deep Purple base */
    --color-primary: #A88BD7;          /* Soft lavender (slightly brighter) */
    --color-primary-dark: #8B6BB7;     /* Deeper lavender */
    --color-primary-light: #C8ABE7;    /* Light lavender */

    /* Secondary - Forest Green */
    --color-secondary: #6AAE7B;        /* Forest green (slightly brighter) */
    --color-secondary-dark: #4A8E5B;   /* Darker forest */
    --color-secondary-light: #8ACE9B;  /* Lighter green */

    /* Background - Lighter with more saturation/richness */
    --color-background: #261A38;       /* Rich deep purple - more saturated */
    --color-background-alt: #302448;   /* Richer purple alt */
    --color-surface: #3C2E55;          /* More vibrant surface */

    /* Text - Dusty off-whites (unchanged for contrast) */
    --color-text: #EBE8F0;             /* Primary text - Contrast ~11:1 with background */
    --color-text-light: #C0B8CC;       /* Secondary text - Contrast ~6:1 */
    --color-text-muted: #948CA4;       /* Muted text - Contrast ~4:1 */

    /* Borders */
    --color-border: #4A4060;           /* Slightly lighter border */

    /* Typography */
    --font-serif: 'Cormorant Garamond', 'Georgia', serif;
    --font-sans: 'Source Sans Pro', 'Helvetica Neue', sans-serif;

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

    /* Container */
    --container-max: 1200px;
    --container-narrow: 800px;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    background-color: var(--color-background);
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 600;
    line-height: 1.2;
    margin: 0 0 var(--spacing-sm);
    color: var(--color-text);
}

h1 {
    font-size: 3rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.25rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin: 0 0 var(--spacing-sm);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-secondary-light);
}

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

.container-narrow {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.site-header {
    background: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.site-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.site-logo h1 {
    font-size: 1.5rem;
    margin: 0;
    color: var(--color-primary);
}

.site-logo .tagline {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Navigation */
.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: var(--spacing-md);
}

.main-nav a {
    color: var(--color-text-light);
    font-weight: 500;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--spacing-xs) 0;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-secondary);
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    margin: 5px 0;
    transition: 0.3s;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--color-background) 0%, #332850 50%, #233530 100%);
    color: var(--color-text);
    padding: var(--spacing-xl) 0;
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}

.hero h1 {
    color: var(--color-text);
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
}

.hero .lead {
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto var(--spacing-md);
    opacity: 0.9;
    line-height: 1.7;
    color: var(--color-text-light);
}

.hero .cta-group {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
}

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

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

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-text-light);
}

.btn-outline:hover {
    background: var(--color-text);
    color: var(--color-background);
}

/* Content Sections */
.section {
    padding: var(--spacing-xl) 0;
}

.section-alt {
    background: var(--color-background-alt);
}

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

.section-header h2 {
    margin-bottom: var(--spacing-xs);
}

.section-header .subtitle {
    color: var(--color-text-light);
    font-size: 1.1rem;
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-md);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    transform: translateY(-2px);
}

.card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.card p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.card-icon {
    width: 48px;
    height: 48px;
    background: var(--color-background-alt);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
    color: var(--color-secondary);
    font-size: 1.5rem;
}

/* Team Grid */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.team-member {
    text-align: center;
}

.team-member img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: var(--spacing-sm);
    border: 3px solid var(--color-border);
}

.team-member h3 {
    margin-bottom: var(--spacing-xs);
    font-size: 1.25rem;
}

.team-member .role {
    color: var(--color-secondary-light);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.team-member .bio {
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* Partners/Logos Section */
.partners {
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
}

.partners h3 {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-md);
}

.partners-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
}

.partners-grid img {
    height: 40px;
    opacity: 0.5;
    filter: grayscale(100%) brightness(2);
    transition: all 0.2s ease;
}

.partners-grid img:hover {
    opacity: 0.8;
    filter: grayscale(0%);
}

/* Footer */
.site-footer {
    background: #18121F;
    color: var(--color-text);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.footer-about h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.footer-about p {
    opacity: 0.8;
    font-size: 0.9rem;
}

.footer-links h4,
.footer-contact h4 {
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
}

.footer-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links a {
    color: var(--color-text-light);
    font-size: 0.9rem;
    display: block;
    padding: var(--spacing-xs) 0;
}

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

.footer-contact p {
    color: var(--color-text-light);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-md);
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.text-muted {
    color: var(--color-text-muted);
}

.mb-0 {
    margin-bottom: 0;
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}

/* Responsive Design */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .nav-toggle {
        display: block;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-background);
        border-bottom: 1px solid var(--color-border);
        padding: var(--spacing-sm);
    }

    .main-nav.active {
        display: block;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 0;
    }

    .main-nav a {
        display: block;
        padding: var(--spacing-sm);
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}

/* Page-specific styles */

/* About Page */
.about-intro {
    font-size: 1.2rem;
    color: var(--color-text-light);
    max-width: var(--container-narrow);
    margin: 0 auto var(--spacing-lg);
}

.values-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.value-item {
    padding: var(--spacing-md);
    border-left: 3px solid var(--color-secondary);
    background: var(--color-surface);
}

.value-item h3 {
    color: var(--color-primary);
}

/* Research Page */
.research-item {
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
}

.research-item:last-child {
    border-bottom: none;
}

.research-item h3 {
    margin-bottom: var(--spacing-xs);
}

.research-meta {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-xs);
}

/* Contact Page */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.contact-form label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--color-text);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-family: var(--font-sans);
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    background: var(--color-surface);
    color: var(--color-text);
}

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

.contact-form textarea {
    min-height: 150px;
    resize: vertical;
}

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