:root {
    /* Brand Palette - Modern, Clean, Inspiring */
    --primary-color: #0F766E;
    /* Teal: Professional, Trustworthy, Growth */
    --primary-dark: #115E59;
    --secondary-color: #3B82F6;
    /* Soft Blue: Calmness (Hilton/Corporate feel) */
    --accent-color: #F59E0B;
    /* Amber: Warmth/Energy */

    --text-main: #334155;
    /* Slate 700 */
    --text-muted: #64748B;
    --text-light: #94A3B8;
    --text-white: #FFFFFF;

    --bg-body: #F8FAFC;
    /* Slate 50 */
    --bg-white: #FFFFFF;
    --bg-light: #F1F5F9;

    /* Gradients */
    --gradient-hero: linear-gradient(135deg, #0F766E 0%, #0E7490 100%);
    --gradient-accent: linear-gradient(135deg, #3B82F6 0%, #2563EB 100%);

    /* Modern Typography */
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --font-display: 'Outfit', sans-serif;

    /* Spacing */
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --container-width: 1200px;
    --radius-md: 12px;
    --radius-full: 9999px;

    /* Effects */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: var(--font-main);
    color: var(--text-main);
    background-color: var(--bg-body);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    color: var(--primary-dark);
    line-height: 1.2;
}

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

/* Navbar */
header {
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-main);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--secondary-color);
    font-weight: 600;
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    cursor: pointer;
    text-align: center;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--text-white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    border: 2px solid var(--text-white);
    color: var(--text-white);
}

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

/* Hero Section */
.hero {
    background: var(--gradient-hero), url('../images/group-photo.jpg');
    background-blend-mode: overlay;
    /* Ensure text is readable over photo */
    background-size: cover;
    background-position: center;
    color: var(--text-white);
    padding: var(--spacing-xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero h1 {
    color: var(--text-white);
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Section Styles */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--primary-dark);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

/* Impact Stats */
.impact-section {
    background: var(--bg-white);
    padding: var(--spacing-lg) 0;
}

.stat-card {
    text-align: center;
    padding: 2rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-color);
    display: block;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Timeline (Retaining structure) */
.timeline-section {
    padding: var(--spacing-lg) 0;
    background: var(--bg-light);
}

/* ... (Timeline styles can be added if we keep the timeline) ... */

/* Footer */
footer {
    background: #1e293b;
    color: #cbd5e1;
    padding: var(--spacing-lg) 0 var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.footer-column h4 {
    color: var(--text-white);
    margin-bottom: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background: white;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-menu-btn {
        display: block;
    }

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

/* Utility */
.animate {
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}