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

:root {
    --blue-navbar: #010180;
    --blue-dark: #1a365d;
    --blue-mid: #2c5282;
    --blue-light: #3182ce;
    --blue-accent: #4299e1;
    --white: #ffffff;
    --gray-light: #f7fafc;
    --gray-mid: #e2e8f0;
    --text-dark: #1a202c;
    --text-light: #718096;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

/* Navigation */
header {
    background-color: var(--blue-navbar);
    border-bottom: 2px solid var(--blue-dark);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    letter-spacing: -0.5px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: var(--white);
    font-weight: 500;
    transition: opacity 0.2s;
}

nav a:hover {
    opacity: 0.8;
}

/* Main Content */
main {
    padding-top: 60px;
}

section {
    padding: 5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

h1, h2, h3 {
    color: var(--blue-dark);
}

h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--blue-light);
    display: inline-block;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 8rem 2rem;
    background: linear-gradient(180deg, var(--gray-light) 0%, var(--white) 100%);
    border-bottom: 1px solid var(--gray-mid);
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1rem;
    letter-spacing: -1px;
}

.tagline {
    font-size: 1.5rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    padding: 0.75rem 2rem;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--blue-mid);
    border-color: var(--blue-mid);
}

.btn-secondary {
    background-color: var(--white);
    color: var(--blue-dark);
    border-color: var(--blue-dark);
}

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

/* About Section */
.about p {
    font-size: 1.125rem;
    max-width: 800px;
    color: var(--text-dark);
    line-height: 1.8;
}

.demo-container {
    margin-top: 1.5rem;
    background-color: #abc9e6;
    overflow: hidden;
    max-height: 49px;
    transition: max-height 1s ease;
}

.demo-container.open {
    max-height: 800px;
}

.demo-btn {
    display: block;
    width: 100%;
    padding: 0.75rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    background-color: var(--blue-navbar);
    color: var(--white);
    border: none;
    cursor: pointer;
    transition: background-color 0.2s;
    height: 50px;
}

.demo-btn:hover {
    background-color: var(--blue-dark);
}

.demo-container video {
    display: block;
    height: 700px;
}

/* Features Section */
.features {
    background-color: var(--gray-light);
    max-width: 100%;
    padding-left: 2rem;
    padding-right: 2rem;
}

.features h2 {
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    display: block;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background-color: var(--white);
    padding: 2rem;
    border: 1px solid var(--gray-mid);
    border-left: 4px solid var(--blue-light);
}

.feature-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--text-light);
}

/* Getting Started Section */
.code-block {
    background-color: var(--blue-dark);
    padding: 2rem;
    overflow-x: auto;
}

.code-block pre {
    margin: 0;
}

.code-block code {
    color: var(--gray-light);
    font-family: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, monospace;
    font-size: 0.9rem;
    line-height: 1.8;
}

/* Thanks Section */
.thanks {
    text-align: center;
    background-color: var(--gray-light);
    max-width: 100%;
    border-top: 1px solid var(--gray-mid);
}

.thanks-links {
    list-style: none;
    max-width: 400px;
    margin: 0 auto;
}

.thanks-links li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--gray-mid);
}

.thanks-links li:last-child {
    border-bottom: none;
}

.thanks-links a {
    color: var(--blue-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.thanks-links a:hover {
    color: var(--blue-light);
}

/* Footer */
footer {
    background-color: var(--blue-dark);
    color: var(--white);
    text-align: center;
    padding: 2rem;
    border-top: 4px solid var(--blue-mid);
}

footer p {
    opacity: 0.9;
}

/* Responsive */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        gap: 1rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .tagline {
        font-size: 1.125rem;
    }

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

    section {
        padding: 3rem 1rem;
    }

    .demo-container {
        max-height: 50px;
    }

    .demo-container video {
        height: auto;
    }
}