/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
    /* Colors */
    --color-primary: #4F2683;
    --color-primary-dark: #3d1d66;
    --color-primary-light: #6b3ba3;
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Layout */
    --container-max: 1200px;
    --header-height: 80px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

/* ========================================
   Layout
   ======================================== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-4xl) 0;
}

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

.section--light {
    background-color: var(--color-gray-50);
}

.section--dark {
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4 {
    font-family: var(--font-serif);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-gray-900);
}

.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4 {
    color: var(--color-white);
}

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

p:last-child {
    margin-bottom: 0;
}

/* ========================================
   Header
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    z-index: 1000;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

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

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--color-primary);
    color: var(--color-white);
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 1.25rem;
    border-radius: 8px;
}

.logo-icon--small {
    width: 32px;
    height: 32px;
    font-size: 1rem;
}

.logo-text {
    font-family: var(--font-serif);
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--color-gray-900);
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-gray-600);
    transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus {
    color: var(--color-primary);
}

.nav-link--cta {
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: 6px;
    transition: background-color var(--transition-fast);
}

.nav-link--cta:hover,
.nav-link--cta:focus {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    width: 44px;
    height: 44px;
    background: none;
    border: none;
    cursor: pointer;
    position: relative;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-gray-700);
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    transition: background-color var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-gray-700);
    position: absolute;
    left: 0;
    transition: transform var(--transition-base);
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

.mobile-menu-btn[aria-expanded="true"] .hamburger {
    background-color: transparent;
}

.mobile-menu-btn[aria-expanded="true"] .hamburger::before {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn[aria-expanded="true"] .hamburger::after {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    padding-top: calc(var(--header-height) + var(--spacing-4xl));
    padding-bottom: var(--spacing-4xl);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: 720px;
}

.hero-title {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.7;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn--primary:hover,
.btn--primary:focus {
    background-color: var(--color-gray-100);
    transform: translateY(-1px);
}

/* ========================================
   Section Headers
   ======================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-gray-500);
    font-weight: 500;
}

.section-header--light .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

/* ========================================
   About Section
   ======================================== */
.about-content {
    display: grid;
    gap: var(--spacing-3xl);
}

.about-text {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
}

.about-text p {
    font-size: 1.0625rem;
    margin-bottom: var(--spacing-lg);
}

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

.value-card {
    text-align: center;
    padding: var(--spacing-xl);
}

.value-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: 12px;
    margin-bottom: var(--spacing-lg);
}

.value-title {
    font-family: var(--font-sans);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.value-description {
    color: var(--color-gray-600);
    font-size: 0.9375rem;
}

/* ========================================
   Criteria Section
   ======================================== */
.criteria-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.criteria-card {
    background-color: var(--color-gray-50);
    padding: var(--spacing-xl);
    border-radius: 12px;
    border: 1px solid var(--color-gray-200);
}

.criteria-title {
    font-family: var(--font-sans);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--color-primary);
}

.criteria-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.criteria-list li {
    position: relative;
    padding-left: var(--spacing-lg);
    font-size: 0.9375rem;
    color: var(--color-gray-600);
}

.criteria-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5em;
    width: 6px;
    height: 6px;
    background-color: var(--color-primary);
    border-radius: 50%;
}

/* ========================================
   Background Section
   ======================================== */
.background-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-3xl);
    max-width: 900px;
    margin: 0 auto;
}

.background-text p {
    font-size: 1.0625rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-lg);
}

.credentials {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
}

.credential-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.credential-label {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: rgba(255, 255, 255, 0.7);
}

.credential-value {
    font-size: 1rem;
    color: var(--color-white);
}

/* ========================================
   Contact Section
   ======================================== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.contact-text p {
    font-size: 1.0625rem;
}

.contact-card {
    display: flex;
    justify-content: center;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg) var(--spacing-xl);
    background-color: var(--color-gray-50);
    border-radius: 12px;
    border: 1px solid var(--color-gray-200);
}

.contact-method svg {
    color: var(--color-primary);
    flex-shrink: 0;
}

.contact-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
}

.contact-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-500);
}

.contact-value {
    font-size: 1.0625rem;
    font-weight: 500;
    color: var(--color-primary);
    transition: color var(--transition-fast);
}

.contact-value:hover {
    color: var(--color-primary-dark);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-gray-900);
    color: var(--color-gray-400);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-name {
    font-family: var(--font-serif);
    font-weight: 600;
    color: var(--color-white);
}

.footer-copy {
    font-size: 0.875rem;
    margin: 0;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }

    .section {
        padding: var(--spacing-3xl) 0;
    }

    /* Mobile Navigation */
    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background-color: var(--color-white);
        border-bottom: 1px solid var(--color-gray-200);
        padding: var(--spacing-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

    .nav.is-open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .nav-link {
        display: block;
        padding: var(--spacing-md);
        text-align: center;
    }

    .nav-link--cta {
        width: 100%;
    }

    .mobile-menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* Hero adjustments */
    .hero {
        min-height: auto;
        padding-top: calc(var(--header-height) + var(--spacing-3xl));
        padding-bottom: var(--spacing-3xl);
    }

    /* Criteria cards stack */
    .criteria-grid {
        grid-template-columns: 1fr;
    }

    /* Contact */
    .contact-method {
        flex-direction: column;
        text-align: center;
    }

    .contact-info {
        align-items: center;
    }
}

@media (max-width: 480px) {
    .logo-text {
        font-size: 1rem;
    }

    .about-values {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Accessibility
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Skip link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 9999;
    transition: top var(--transition-fast);
}

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

/* Print styles */
@media print {
    .header,
    .mobile-menu-btn {
        display: none;
    }

    .hero {
        padding-top: var(--spacing-2xl);
        min-height: auto;
        background: var(--color-gray-100);
        color: var(--color-gray-900);
    }

    .hero-title,
    .hero-subtitle {
        color: var(--color-gray-900);
    }

    .section--dark {
        background: var(--color-gray-100);
        color: var(--color-gray-900);
    }

    .section--dark h1,
    .section--dark h2,
    .section--dark h3,
    .section--dark p {
        color: var(--color-gray-900);
    }
}