/* --- Base Styles & Typography --- */
:root {
    /* Colors */
    --primary-color: #3B82F6; /* A vibrant blue for main actions */
    --secondary-color: #10B981; /* A green for positive accents */
    --text-color: #334155; /* Dark grey for body text */
    --heading-color: #1F2937; /* Even darker grey for headings */
    --background-color: #FFFFFF;
    --light-gray-bg: #F9FAFB; /* Light background for alternating sections */
    --border-color: #E5E7EB;

    /* Fonts */
    --font-family-sans: 'Inter', sans-serif; /* Recommended modern sans-serif font */
    --font-family-serif: 'Georgia', serif; /* Optional: for a touch of elegance */

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    --spacing-xxl: 6rem;
}

/* Import Google Fonts (if you use them) */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

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

body {
    font-family: var(--font-family-sans);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    -webkit-font-smoothing: antialiased; /* Improves font rendering on macOS/iOS */
    scroll-behavior: smooth; /* Smooth scrolling for anchor links */
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-sans);
    color: var(--heading-color);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

h1 { font-size: 3.5rem; } /* Hero headline */
h2 { font-size: 2.5rem; } /* Section headlines */
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; font-weight: 600; } /* Feature group titles */
h5 { font-size: 1.25rem; font-weight: 600; } /* Feature item titles */
p { margin-bottom: var(--spacing-sm); }

.highlight {
    color: var(--primary-color);
    white-space: nowrap;
}

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

a:hover {
    color: var(--secondary-color);
}

ul {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

ul li {
    position: relative;
    padding-left: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

ul li::before {
    content: '•'; /* Simple bullet point */
    color: var(--secondary-color);
    position: absolute;
    left: 0;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 0.375rem; /* Equivalent to 6px */
    font-weight: 600;
    text-align: center;
    transition: background-color 0.3s ease, transform 0.2s ease;
    text-decoration: none;
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background-color: #3B6FD6; /* Slightly darker primary */
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background-color: #0F966B; /* Slightly darker secondary */
    transform: translateY(-2px);
}

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

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

/* --- Header & Navigation --- */
header {
    background-color: var(--background-color);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--border-color);
    text-align: center; /* Center logo and tagline */
}

.header-content {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon {
    width: 80px;
    height: 80px;
    object-fit: contain;
    position: absolute;
    left: calc(50% - 200px);
}

.header-text {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.logo {
    font-size: 2rem;
    font-weight: 800;
    color: var(--heading-color);
    margin-bottom: var(--spacing-xs);
}

.tagline {
    font-size: 1rem;
    color: var(--text-color);
    margin-bottom: 0;
}

/* --- Hero Section --- */
.hero {
    background-color: var(--light-gray-bg);
    padding: var(--spacing-xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero h2 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
}

.hero .sub-headline {
    font-size: 1.5rem;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    color: var(--text-color);
}

.hero-media {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -1;
    filter: brightness(0.7); /* Darken video/image slightly for text readability */
}
.hero-image { width: 100%; height: 100%; display: block; }
.hero video { width: 100%; height: 100%; display: block; }


/* --- Feature Sections --- */
.features-section {
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.features-section h3 {
    margin-bottom: var(--spacing-sm);
}

.features-section h4 {
    margin-bottom: var(--spacing-xl);
    color: var(--text-color); /* Lighter than main heading */
}

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

.feature-item {
    background-color: var(--background-color);
    padding: var(--spacing-lg);
    border-radius: 0.5rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.feature-item img {
    width: 150px; /* Extra large icon size */
    height: 150px;
    margin-bottom: var(--spacing-md);
}

.feature-item h5 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.feature-item p {
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--text-color);
    margin-bottom: 0;
}

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

/* --- Open Ecosystem / Text Content Section --- */
.text-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: left;
}

.text-content ul {
    list-style: none; /* Remove default list style */
    padding-left: 0;
}

.text-content ul li {
    position: relative;
    padding-left: var(--spacing-lg); /* Space for custom bullet */
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

.text-content ul li::before {
    content: '✓'; /* Checkmark bullet */
    color: var(--secondary-color);
    position: absolute;
    left: 0;
    font-weight: 700;
}


/* --- How It Works Section --- */
.how-it-works {
    padding: var(--spacing-xl) 0;
    text-align: center;
}

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

.step-item {
    padding: var(--spacing-lg);
    border-radius: 0.5rem;
    background-color: var(--background-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
    border: 1px solid var(--border-color);
}

.step-item .step-number {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: var(--background-color);
    border-radius: 50%;
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.step-item h5 {
    color: var(--heading-color);
    margin-bottom: var(--spacing-sm);
}

.step-item p {
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* --- Call to Action Section --- */
.cta-section {
    background-color: var(--primary-color);
    color: var(--background-color);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.cta-section h3 {
    color: var(--background-color);
    margin-bottom: var(--spacing-md);
}

.cta-section .btn {
    background-color: var(--background-color);
    color: var(--primary-color);
    font-size: 1.25rem;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: 0.5rem;
}

.cta-section .btn:hover {
    background-color: #E5E7EB; /* Slightly darker white */
    color: var(--primary-color);
}

.cta-section .small-text {
    font-size: 0.9rem;
    margin-top: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.8);
}

/* --- Signup Form --- */
.signup-form {
    max-width: 500px;
    margin: 0 auto var(--spacing-lg);
    text-align: left;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 0.375rem;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--background-color);
    font-size: 1rem;
    transition: border-color 0.3s ease, background-color 0.3s ease;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--background-color);
    background-color: rgba(255, 255, 255, 0.2);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.signup-form .btn {
    width: 100%;
    margin-top: var(--spacing-sm);
}

.form-success {
    background-color: rgba(16, 185, 129, 0.2);
    border: 2px solid var(--secondary-color);
    border-radius: 0.375rem;
    padding: var(--spacing-md);
    text-align: center;
    margin-top: var(--spacing-md);
}

.form-success p {
    color: var(--background-color);
    font-size: 1.1rem;
    margin: 0;
}

/* --- Testimonials Section (Optional) --- */
.testimonials-section {
    padding: var(--spacing-xl) 0;
    text-align: center;
}

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

.testimonial-item {
    background-color: var(--background-color);
    padding: var(--spacing-lg);
    border-radius: 0.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    text-align: left;
}

.testimonial-item p {
    font-style: italic;
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
}

.testimonial-item cite {
    display: block;
    font-style: normal;
    font-weight: 600;
    color: var(--primary-color);
}

.press-logos {
    margin-top: var(--spacing-xl);
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
}

.press-logos img {
    max-height: 50px; /* Adjust logo height */
    filter: grayscale(100%); /* Make logos grayscale */
    opacity: 0.7;
    transition: filter 0.3s ease, opacity 0.3s ease;
}

.press-logos img:hover {
    filter: grayscale(0%);
    opacity: 1;
}

/* --- Footer --- */
footer {
    background-color: var(--heading-color); /* Dark footer */
    color: rgba(255, 255, 255, 0.7);
    padding: var(--spacing-lg) 0;
    text-align: center;
    font-size: 0.9rem;
}

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

.footer-nav a {
    color: rgba(255, 255, 255, 0.7);
    margin: 0 var(--spacing-sm);
}

.footer-nav a:hover {
    color: var(--background-color);
}

.social-links {
    margin-top: var(--spacing-sm);
}

.social-links a {
    display: inline-block;
    margin: 0 var(--spacing-xs);
}

.social-links img {
    width: 24px;
    height: 24px;
    filter: invert(100%) opacity(70%); /* Make social icons light */
    transition: filter 0.3s ease, opacity 0.3s ease;
}

.social-links img:hover {
    filter: invert(100%) opacity(100%);
}


/* --- Responsive Design (Media Queries) --- */

/* Tablets and small desktops */
@media (max-width: 992px) {
    h1 { font-size: 2.8rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.75rem; }
    .hero .sub-headline { font-size: 1.25rem; }

    .feature-grid,
    .process-steps {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

/* Mobile devices */
@media (max-width: 768px) {
    h1 { font-size: 2.2rem; }
    h2 { font-size: 1.8rem; }
    h3 { font-size: 1.5rem; }
    h4 { font-size: 1.3rem; }
    h5 { font-size: 1.1rem; }
    .hero .sub-headline { font-size: 1.1rem; }

    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 1rem;
    }
    .cta-section .btn {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 1.1rem;
    }

    .features-section,
    .how-it-works,
    .cta-section,
    .testimonials-section {
        padding: var(--spacing-lg) 0;
    }

    .feature-grid,
    .process-steps,
    .testimonial-grid {
        grid-template-columns: 1fr; /* Stack columns on small screens */
        gap: var(--spacing-md);
    }

    .footer-nav {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
}

/* Very small mobile devices */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    h1 { font-size: 1.8rem; }
    h2 { font-size: 1.5rem; }
    .hero .sub-headline { font-size: 1rem; }
}

/* Modal-specific form field fix */
#signup-modal .form-group input,
#signup-modal .form-group textarea {
    background-color: #fff;
    color: #334155;
    border: 2px solid #E5E7EB;
}
#signup-modal .form-group input::placeholder,
#signup-modal .form-group textarea::placeholder {
    color: #94a3b8;
}