/* ARCG Website Styles - Improved & Modular */
/* Certified Prime Consulting for Government Contract Execution */

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

/* ===== CSS Custom Properties (Design Tokens) ===== */
:root {
    /* Colors */
    --color-text: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-bg: #ffffff;
    --color-bg-secondary: #f5f5f7;
    --color-accent: #0071e3;
    --color-accent-hover: #0077ed;
    --color-accent-dark: #0051a8;
    
    /* Spacing */
    --spacing-unit: 8px;
    --spacing-xs: calc(var(--spacing-unit) * 2);
    --spacing-sm: calc(var(--spacing-unit) * 3);
    --spacing-md: calc(var(--spacing-unit) * 4);
    --spacing-lg: calc(var(--spacing-unit) * 6);
    --spacing-xl: calc(var(--spacing-unit) * 8);
    --spacing-2xl: calc(var(--spacing-unit) * 12);
    
    /* Layout */
    --max-width: 1200px;
    --header-height: 48px;
    
    /* Typography */
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-heading: 'Playfair Display', Georgia, serif;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
}

/* ===== Base Styles ===== */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== Skip Navigation (Accessibility) ===== */
.skip-nav {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-accent);
    color: white;
    padding: var(--spacing-xs);
    text-decoration: none;
    z-index: 100;
}

.skip-nav:focus {
    top: 0;
}

/* ===== Header - Apple Style ===== */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

/* Fallback for browsers without backdrop-filter support */
@supports not (backdrop-filter: blur(20px)) {
    header {
        background: rgba(255, 255, 255, 0.95);
    }
}

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

.logo {
    font-family: var(--font-heading);
    font-size: 28px;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: 0.1em;
    white-space: nowrap;
    text-transform: uppercase;
}

.logo:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 4px;
}

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

.nav-links a {
    color: var(--color-text);
    text-decoration: none;
    font-size: 14px;
    font-weight: 400;
    transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a:focus {
    color: var(--color-accent);
    outline: none;
}

.nav-cta {
    background: var(--color-accent);
    color: white;
    padding: var(--spacing-xs) calc(var(--spacing-unit) * 2.5);
    border-radius: 20px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: background var(--transition-fast);
}

.nav-cta:hover,
.nav-cta:focus {
    background: var(--color-accent-hover);
    outline: 2px solid var(--color-accent-dark);
    outline-offset: 2px;
}

/* ===== Hero Section ===== */
.hero {
    padding: calc(var(--header-height) + var(--spacing-2xl)) var(--spacing-sm) var(--spacing-2xl);
    text-align: center;
    background: linear-gradient(135deg, #f5f5f7 0%, #ffffff 100%);
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(40px, 6vw, 72px);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.hero-subtitle {
    font-size: clamp(18px, 2.5vw, 24px);
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

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

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: calc(var(--spacing-unit) * 2) var(--spacing-lg);
    border-radius: 24px;
    font-size: 17px;
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover,
.btn-primary:focus {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    outline: 2px solid var(--color-accent-dark);
    outline-offset: 2px;
}

.btn-secondary {
    background: transparent;
    color: var(--color-accent);
    border: 2px solid var(--color-accent);
}

.btn-secondary:hover,
.btn-secondary:focus {
    background: var(--color-accent);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===== Section Styles ===== */
.section {
    padding: var(--spacing-2xl) var(--spacing-sm);
}

.section-container {
    max-width: var(--max-width);
    margin: 0 auto;
}

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

.section-label {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.section-title {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.01em;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.section-description {
    font-size: 19px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    max-width: 700px;
    margin: 0 auto;
}

/* ===== Value Props Grid ===== */
.value-props {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.value-prop {
    padding: var(--spacing-lg);
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-medium);
    opacity: 0;
    transform: translateY(30px);
}

.value-prop.visible {
    opacity: 1;
    transform: translateY(0);
    animation: fadeInUp 0.6s ease-out forwards;
}

.value-prop:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.value-prop-icon {
    width: 60px;
    height: 60px;
    background: var(--color-accent);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    font-size: 28px;
}

.value-prop h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.01em;
}

.value-prop p {
    font-size: 17px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===== Solutions Grid ===== */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-top: var(--spacing-xl);
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.solution-card {
    display: flex;
    flex-direction: column;
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-medium);
    opacity: 0;
    transform: translateY(30px);
    height: 100%;
}

.solution-card.visible {
    opacity: 1;
    transform: translateY(0);
    animation: fadeInUp 0.6s ease-out forwards;
}

.solution-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.solution-image {
    width: 100%;
    height: 240px;
    object-fit: cover;
    object-position: center;
}

.solution-content {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    padding: var(--spacing-lg);
}

.solution-content h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.01em;
}

.solution-content p {
    font-size: 16px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.solution-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
    transition: gap var(--transition-fast);
    margin-top: auto;
}

.solution-link:hover,
.solution-link:focus {
    gap: 12px;
    outline: 2px solid var(--color-accent);
    outline-offset: 4px;
    border-radius: 4px;
    padding: 2px;
}

.solution-link::after {
    content: '→';
    font-size: 20px;
}

/* ===== Process Section ===== */
.process {
    background: var(--color-bg-secondary);
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.process-step {
    text-align: center;
    opacity: 0;
    transform: translateY(30px);
}

.process-step.visible {
    opacity: 1;
    transform: translateY(0);
    animation: fadeInUp 0.6s ease-out forwards;
}

.process-number {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.process-step h3 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.01em;
}

.process-step p {
    font-size: 17px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===== CTA Section ===== */
.cta-section {
    background: var(--color-text);
    color: white;
    text-align: center;
}

.cta-section .section-title {
    color: white;
}

.cta-section .section-description {
    color: rgba(255, 255, 255, 0.7);
}

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

.cta-section .btn-primary:hover,
.cta-section .btn-primary:focus {
    background: var(--color-bg-secondary);
}

/* ===== Footer ===== */
footer {
    background: var(--color-bg-secondary);
    padding: var(--spacing-xl) var(--spacing-sm);
    text-align: center;
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
}

.footer-company-name {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color var(--transition-fast);
}

.footer-links a:hover,
.footer-links a:focus {
    color: var(--color-accent);
    outline: 2px solid var(--color-accent);
    outline-offset: 4px;
    border-radius: 4px;
    padding: 2px 4px;
}

.footer-copyright {
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* ===== Animations ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero {
        min-height: 60vh;
        padding-top: calc(var(--header-height) + var(--spacing-xl));
    }
    
    .value-props,
    .solutions-grid,
    .process-grid {
        grid-template-columns: 1fr;
    }
    
    .solution-image {
        height: 200px;
    }
    
    .section {
        padding: var(--spacing-xl) var(--spacing-sm);
    }
}

/* ===== Tablet Responsive ===== */
@media (max-width: 1024px) {
    /* Solutions grid stays at 2 columns */
}

/* ===== Print Styles ===== */
@media print {
    header {
        position: static;
    }
    
    .nav-cta,
    .btn,
    .solution-link {
        display: none;
    }
}