/* ============================================
   Color System - PD Blues, Greens & Neutrals
   ============================================ */
:root {
    /* Primary Blues */
    --pd-blue-dark: #1a365d;
    --pd-blue-medium: #2c5282;
    --pd-blue-light: #4299e1;
    --pd-blue-lighter: #90cdf4;
    
    /* Greens */
    --pd-green-dark: #22543d;
    --pd-green-medium: #38a169;
    --pd-green-light: #68d391;
    
    /* Neutrals */
    --pd-neutral-dark: #2d3748;
    --pd-neutral-medium: #4a5568;
    --pd-neutral-light: #718096;
    --pd-neutral-lighter: #e2e8f0;
    --pd-white: #ffffff;
    
    /* Spacing System */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Typography */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--pd-blue-dark);
    line-height: 1.7;
    background-color: var(--pd-white);
    font-weight: var(--font-weight-normal);
    letter-spacing: -0.01em;
}

/* ============================================
   Header & Navigation
   ============================================ */
header {
    background-color: var(--pd-white);
    padding: var(--spacing-md) 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
    transition: box-shadow var(--transition-base);
}

header:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    transition: transform var(--transition-base);
}

.logo:hover {
    transform: scale(1.05);
}

.logo img {
    height: 50px;
    width: auto;
    display: block;
}

nav {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    align-items: center;
}

nav a {
    color: var(--pd-blue-dark);
    text-decoration: none;
    font-size: 14px;
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.02em;
    position: relative;
    padding: var(--spacing-xs) 0;
    transition: color var(--transition-base), transform var(--transition-fast);
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--pd-blue-medium), var(--pd-green-medium));
    transition: width var(--transition-base);
}

nav a:hover {
    color: var(--pd-blue-medium);
    transform: translateY(-1px);
}

nav a:hover::after {
    width: 100%;
}

nav a.active {
    color: var(--pd-blue-medium);
    font-weight: var(--font-weight-semibold);
}

nav a.active::after {
    width: 100%;
    background: linear-gradient(90deg, var(--pd-blue-medium), var(--pd-green-medium));
}

/* ============================================
   Hero Section with Enhanced Overlays
   ============================================ */
.hero {
    position: relative;
    width: 100%;
    min-height: 75vh;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* Vignette Effect */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at center, transparent 0%, rgba(0, 0, 0, 0.4) 100%);
    z-index: 1;
    pointer-events: none;
}

/* Gradient Mask for Better Readability */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.2) 0%,
        rgba(0, 0, 0, 0.1) 50%,
        rgba(0, 0, 0, 0.4) 100%
    );
    z-index: 1;
    pointer-events: none;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 54, 93, 0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
}

.hero-content {
    text-align: center;
    color: var(--pd-white);
    padding: var(--spacing-xl) var(--spacing-lg);
    max-width: 1000px;
    z-index: 3;
    position: relative;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease forwards;
}

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

.hero-content h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    line-height: 1.15;
    letter-spacing: -0.02em;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.5), 0 4px 8px rgba(0, 0, 0, 0.3);
    animation-delay: 0.2s;
}

.hero-subtitle {
    font-size: clamp(1.2rem, 2.5vw, 1.75rem);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.01em;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4), 0 1px 4px rgba(0, 0, 0, 0.3);
    animation-delay: 0.3s;
}

.hero-description {
    font-size: clamp(1rem, 2vw, 1.35rem);
    font-weight: var(--font-weight-normal);
    line-height: 1.7;
    letter-spacing: 0.01em;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4), 0 1px 4px rgba(0, 0, 0, 0.3);
    animation-delay: 0.4s;
}

/* ============================================
   Main Content with Fade-in Animations
   ============================================ */
.content {
    max-width: 1000px;
    margin: var(--spacing-2xl) auto;
    padding: 0 var(--spacing-lg);
}

.content-block {
    margin-bottom: var(--spacing-xl);
    text-align: center;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.content-block.visible {
    opacity: 1;
    transform: translateY(0);
}

.content-block p {
    font-size: clamp(1rem, 1.5vw, 1.15rem);
    color: var(--pd-blue-dark);
    line-height: 1.85;
    letter-spacing: 0.01em;
    font-weight: var(--font-weight-normal);
}

.content-block .bold-text {
    font-weight: var(--font-weight-bold);
    font-size: clamp(1.15rem, 2vw, 1.4rem);
    line-height: 1.6;
    letter-spacing: -0.01em;
    color: var(--pd-blue-dark);
}

.content-block .large-heading {
    font-size: clamp(1.3rem, 2.5vw, 1.6rem);
    font-weight: var(--font-weight-bold);
    line-height: 1.5;
    letter-spacing: -0.015em;
}

/* ============================================
   Footer
   ============================================ */
footer {
    background-color: var(--pd-white);
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--pd-neutral-lighter);
    margin-top: var(--spacing-2xl);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-container .logo img {
    height: 40px;
    width: auto;
    opacity: 0.8;
    transition: opacity var(--transition-base);
}

.footer-container .logo:hover img {
    opacity: 1;
}

.copyright {
    color: var(--pd-blue-dark);
    font-size: 14px;
    font-weight: var(--font-weight-normal);
    letter-spacing: 0.02em;
}

.website-link a {
    color: var(--pd-blue-dark);
    text-decoration: none;
    font-size: 14px;
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.02em;
    position: relative;
    transition: color var(--transition-base);
}

.website-link a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--pd-blue-medium);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-base);
}

.website-link a:hover {
    color: var(--pd-blue-medium);
}

.website-link a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* ============================================
   Responsive Design & Mobile Optimizations
   ============================================ */
@media (max-width: 1024px) {
    .header-container {
        padding: 0 var(--spacing-md);
    }
    
    nav {
        gap: var(--spacing-md);
    }
    
    .content {
        padding: 0 var(--spacing-md);
    }
}

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

    nav {
        justify-content: center;
        gap: var(--spacing-sm);
        width: 100%;
    }

    nav a {
        font-size: 12px;
        padding: var(--spacing-xs);
    }
    
    .hero {
        min-height: 60vh;
        background-position: center 30%;
    }
    
    .hero-content {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .hero-content h1 {
        margin-bottom: var(--spacing-sm);
    }

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

    .content {
        margin: var(--spacing-xl) auto;
        padding: 0 var(--spacing-md);
    }
    
    .content-block {
        margin-bottom: var(--spacing-lg);
    }

    .content-block p {
        line-height: 1.75;
    }

    .footer-container {
        flex-direction: column;
        text-align: center;
        padding: 0 var(--spacing-md);
    }
    
    .footer-container .logo {
        order: 1;
    }
    
    .copyright {
        order: 2;
    }
    
    .website-link {
        order: 3;
    }
}

@media (max-width: 480px) {
    .header-container {
        padding: 0 var(--spacing-sm);
    }
    
    nav {
        flex-direction: column;
        gap: var(--spacing-xs);
        align-items: stretch;
    }
    
    nav a {
        text-align: center;
        padding: var(--spacing-xs);
    }
    
    .hero {
        min-height: 50vh;
        background-position: center 40%;
    }
    
    .hero-content {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .content {
        margin: var(--spacing-lg) auto;
        padding: 0 var(--spacing-sm);
    }
    
    .content-block {
        margin-bottom: var(--spacing-md);
    }
    
    footer {
        padding: var(--spacing-lg) 0;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    header, footer {
        box-shadow: none;
    }
    
    .hero {
        min-height: 40vh;
    }
    
    .hero-overlay {
        background: rgba(0, 0, 0, 0.5);
    }
}