/* ========================
   CSS Variables & Theme System
   ======================== */

:root {
    /* Light Theme Colors - K19 Brand */
    --color-primary: #1E3A5F;      /* Navy Blue (C:94% M:69% Y:21% K:30%) */
    --color-primary-dark: #0F2341;
    --color-primary-light: #2C5282;

    --color-secondary: #D4AF37;     /* Gold */
    --color-secondary-dark: #B8941E;
    --color-secondary-light: #E8C35E;

    --color-accent: #F5F5F5;
    --color-accent-dark: #E0E0E0;

    --color-background: #FFFFFF;
    --color-background-alt: #F8F9FA;
    --color-surface: #FFFFFF;

    --color-text-primary: #1D3557;
    --color-text-secondary: #457B9D;
    --color-text-muted: #6C757D;

    --color-border: #DEE2E6;
    --color-shadow: rgba(0, 0, 0, 0.1);

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-secondary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

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

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;

    /* Shadows */
    --shadow-sm: 0 1px 3px var(--color-shadow);
    --shadow-md: 0 4px 6px var(--color-shadow);
    --shadow-lg: 0 10px 25px var(--color-shadow);
    --shadow-xl: 0 20px 40px var(--color-shadow);
}

/* Dark Theme */
[data-theme="dark"] {
    --color-primary: #3B5F8F;      /* Lighter Navy for dark mode */
    --color-primary-dark: #1E3A5F;
    --color-primary-light: #4A6FA5;

    --color-secondary: #E8C35E;     /* Brighter Gold for dark mode */
    --color-secondary-dark: #D4AF37;
    --color-secondary-light: #F0D78C;

    --color-accent: #1A1A1A;
    --color-accent-dark: #0A0A0A;

    --color-background: #0D1B2A;
    --color-background-alt: #14213D;
    --color-surface: #1D3557;

    --color-text-primary: #F1FAEE;
    --color-text-secondary: #A8DADC;
    --color-text-muted: #8B949E;

    --color-border: #30363D;
    --color-shadow: rgba(0, 0, 0, 0.3);
}

/* ========================
   Global Styles & Reset
   ======================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-secondary);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-base), color var(--transition-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text-primary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul {
    list-style: none;
}

/* ========================
   Container & Layout
   ======================== */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

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

/* ========================
   Header & Navigation
   ======================== */

.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    gap: var(--spacing-md);
}

.nav-brand {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.logo {
    display: block;
}

.logo-img {
    height: 50px;
    width: auto;
    display: block;
    transition: opacity var(--transition-fast);
}

.logo-dark {
    display: none;
}

[data-theme="dark"] .logo-light {
    display: none;
}

[data-theme="dark"] .logo-dark {
    display: block;
}

.logo-text {
    font-family: var(--font-primary);
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--color-primary);
    letter-spacing: 0.5px;
}

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

.nav-link {
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background-color: var(--color-background-alt);
}

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

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-background-alt);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background-color: var(--color-primary);
    color: white;
    transform: scale(1.1);
}

.theme-icon {
    width: 20px;
    height: 20px;
}

.sun-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-links a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.social-links a:hover {
    color: var(--color-primary);
    transform: translateY(-2px);
}

.social-links svg {
    width: 20px;
    height: 20px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    width: 40px;
    height: 40px;
    justify-content: center;
    align-items: center;
    background-color: var(--color-background-alt);
    border-radius: var(--radius-md);
}

.hamburger {
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    position: relative;
    transition: all var(--transition-base);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: all var(--transition-base);
}

.hamburger::before {
    transform: translateY(-8px);
}

.hamburger::after {
    transform: translateY(8px);
}

/* ========================
   Hero Section
   ======================== */

.hero {
    position: relative;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-3xl) 0;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-background) 0%, var(--color-background-alt) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.highlight {
    color: var(--color-primary);
    position: relative;
    display: inline-block;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.hero-decoration {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-primary) 0%, transparent 70%);
    opacity: 0.05;
    z-index: 1;
    pointer-events: none;
}

/* ========================
   Buttons
   ======================== */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    text-align: center;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: 2px solid transparent;
}

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

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

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

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

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

/* ========================
   Section Styles
   ======================== */

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ========================
   Services Section
   ======================== */

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

.service-card {
    background-color: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--color-border);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.service-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    color: white;
}

.service-icon svg {
    width: 32px;
    height: 32px;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.service-card p {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ========================
   Benefits Section
   ======================== */

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.benefit-item {
    text-align: center;
}

.benefit-number {
    font-family: var(--font-primary);
    font-size: 3rem;
    font-weight: 900;
    color: var(--color-primary);
    opacity: 0.3;
    margin-bottom: var(--spacing-sm);
}

.benefit-item h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.benefit-item p {
    color: var(--color-text-secondary);
}

/* ========================
   CTA Section
   ======================== */

.cta-section {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    color: white;
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-md);
}

.cta-content p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
}

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

.cta-content .btn:hover {
    background-color: var(--color-accent);
    transform: translateY(-2px);
}

/* ========================
   Footer
   ======================== */

.footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-col h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.footer-tagline {
    font-family: var(--font-primary);
    font-weight: 100;
    font-style: italic;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.footer-col p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-contact li {
    display: flex;
    align-items: start;
    gap: var(--spacing-sm);
    color: var(--color-text-secondary);
}

.footer-contact svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-top: 2px;
}

.footer-contact a {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background-color: var(--color-background-alt);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

.footer-social svg {
    width: 20px;
    height: 20px;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
}

.footer-bottom p {
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
}

/* ========================
   Responsive Design
   ======================== */

@media (max-width: 1024px) {
    .nav-menu {
        gap: var(--spacing-md);
    }

    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-background);
        border-top: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: var(--spacing-xs);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all var(--transition-base);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-link {
        width: 100%;
        text-align: left;
    }

    .nav-actions {
        order: -1;
    }

    .social-links {
        display: none;
    }

    .hero {
        min-height: 500px;
        padding: var(--spacing-2xl) 0;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .hero-cta .btn {
        width: 100%;
        max-width: 300px;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .benefits-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
        --spacing-3xl: 4rem;
    }

    .logo-text {
        font-size: 1.25rem;
    }

    .service-card {
        padding: var(--spacing-lg);
    }
}

/* ========================
   Utility Classes
   ======================== */

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

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }