/* ======================================
   Brand Color Palette (from source)
   ====================================== */
:root {
    --color-bg: #eeeeee;
    --color-fg: #000000;
    --color-primary: #000000;
    --color-surface-dark: #000000;
    --color-surface-blue: #304088;

    /* Typography */
    --font-family: system-ui, -apple-system, sans-serif;
    --font-weight-normal: 400;
    --font-weight-bold: 700;

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

    /* Layout */
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-weight: var(--font-weight-normal);
    color: var(--color-fg);
    background-color: var(--color-bg);
    line-height: 1.6;
    font-size: 1rem;
}

/* ======================================
   Typography
   ====================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

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

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: opacity 0.3s ease;
}

a:hover {
    opacity: 0.7;
}

/* ======================================
   Header & Navigation
   ====================================== */
.header {
    background-color: var(--color-bg);
    border-bottom: 2px solid var(--color-primary);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

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

.logo {
    flex: 1;
}

.logo-text {
    font-size: 1.5rem;
    margin: 0;
    font-weight: var(--font-weight-bold);
}

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

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:not(.cta-link)::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width 0.3s ease;
}

.nav-link:not(.cta-link):hover::after {
    width: 100%;
}

.cta-link {
    background-color: var(--color-primary);
    color: var(--color-bg);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 4px;
    font-weight: var(--font-weight-bold);
}

.cta-link:hover {
    opacity: 0.9;
    background-color: var(--color-surface-blue);
}

/* ======================================
   Hero Section
   ====================================== */
.hero {
    background: linear-gradient(135deg, var(--color-bg) 0%, #f5f5f5 100%);
    padding: var(--spacing-2xl) var(--spacing-lg);
    text-align: center;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content {
    max-width: 800px;
    animation: fadeInUp 0.8s ease-out;
}

.hero-headline {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.hero-subheadline {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    color: var(--color-fg);
    opacity: 0.85;
    line-height: 1.7;
}

.cta-button {
    background-color: var(--color-primary);
    color: var(--color-bg);
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: var(--font-weight-bold);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-block;
}

.cta-button:hover {
    background-color: var(--color-surface-blue);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.cta-button:active {
    transform: translateY(0);
}

/* ======================================
   Features Section
   ====================================== */
.features {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
    background-color: #ffffff;
}

.features h2 {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

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

.feature-card {
    background-color: var(--color-bg);
    padding: var(--spacing-lg);
    border-radius: 8px;
    border-left: 4px solid var(--color-primary);
    transition: all 0.3s ease;
    animation: fadeInUp 0.8s ease-out;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.feature-card h3 {
    color: var(--color-primary);
    font-size: 1.25rem;
}

.feature-card p {
    margin-bottom: 0;
    opacity: 0.85;
}

/* ======================================
   Use Cases Section
   ====================================== */
.use-cases {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
    background-color: var(--color-bg);
}

.use-cases h2 {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    color: var(--color-primary);
}

.use-cases-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.use-cases-list li {
    padding: var(--spacing-md);
    background-color: #ffffff;
    border-radius: 6px;
    border-left: 4px solid var(--color-surface-blue);
    transition: all 0.3s ease;
    animation: fadeInUp 0.8s ease-out;
}

.use-cases-list li:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.08);
}

.use-cases-list strong {
    color: var(--color-primary);
    display: block;
    margin-bottom: var(--spacing-xs);
}

/* ======================================
   CTA Section
   ====================================== */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-surface-blue) 100%);
    color: var(--color-bg);
    padding: var(--spacing-2xl) var(--spacing-lg);
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
    animation: fadeInUp 0.8s ease-out;
}

.cta-content h2 {
    color: var(--color-bg);
    margin-bottom: var(--spacing-md);
}

.cta-content p {
    color: rgba(238, 238, 238, 0.9);
    margin-bottom: var(--spacing-lg);
    font-size: 1.1rem;
}

.cta-button-large {
    background-color: var(--color-bg);
    color: var(--color-primary);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
    border: 2px solid var(--color-bg);
}

.cta-button-large:hover {
    background-color: transparent;
    color: var(--color-bg);
}

/* ======================================
   Footer
   ====================================== */
.footer {
    background-color: var(--color-primary);
    color: var(--color-bg);
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
    border-top: 2px solid var(--color-bg);
}

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

.footer-content p {
    margin-bottom: var(--spacing-sm);
    opacity: 0.9;
    font-size: 0.95rem;
}

/* ======================================
   Animations
   ====================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ======================================
   Responsive Design (Mobile First)
   ====================================== */

/* Tablet (768px and up) */
@media (min-width: 768px) {
    h1 {
        font-size: 3rem;
    }

    h2 {
        font-size: 2.5rem;
    }

    .nav-links {
        gap: var(--spacing-xl);
    }

    .hero {
        min-height: 600px;
    }

    .hero-headline {
        font-size: 3.5rem;
    }

    .hero-subheadline {
        font-size: 1.4rem;
    }

    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .use-cases-list {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }
}

/* Desktop (1024px and up) */
@media (min-width: 1024px) {
    .header {
        position: sticky;
    }

    .hero-headline {
        font-size: 4rem;
    }
}

/* Mobile (max 767px) */
@media (max-width: 767px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.25rem;
    }

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

    .nav-links {
        flex-direction: column;
        gap: var(--spacing-md);
        width: 100%;
    }

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

    .hero {
        padding: var(--spacing-xl) var(--spacing-md);
        min-height: 400px;
    }

    .hero-headline {
        font-size: 2rem;
    }

    .hero-subheadline {
        font-size: 1rem;
    }

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

    .use-cases-list {
        gap: var(--spacing-md);
    }

    .features, .use-cases {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .cta-section {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .footer {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .cta-button {
        width: 100%;
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .cta-button-large {
        width: 100%;
    }
}

/* Ensure no horizontal scroll on mobile */
@media (max-width: 768px) {
    body {
        width: 100%;
        overflow-x: hidden;
    }

    .nav-container,
    .hero,
    .features,
    .use-cases,
    .cta-section,
    .footer {
        width: 100%;
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
        box-sizing: border-box;
    }
}