:root {
    --bg-color: #0a0a0a;
    --text-color: #e0e0e0;
    --primary-color: #ffffff;
    --accent-color: #00d9ff;
    --secondary-bg: #1a1a1a;
    --nav-height: 70px;
    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* Improved Dark Theme */
@media (prefers-color-scheme: light) {
    :root {
        --bg-color: #0a0a0a;
        --text-color: #e0e0e0;
        --primary-color: #ffffff;
        --secondary-bg: #1a1a1a;
    }
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Navigation */
header {
    background-color: var(--bg-color);
    height: var(--nav-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary-color);
    text-decoration: none;
}

.logo img {
    height: 30px;
    margin-right: 10px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 20px;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--accent-color);
}

/* Hero Section */
.hero {
    background-color: var(--secondary-bg);
    padding: 4rem 2rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.hero p {
    font-size: 1.2rem;
    max-width: 600px;
    margin-bottom: 2rem;
    color: var(--text-color);
    opacity: 0.9;
}

/* UI Elements: Buttons */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    margin-left: 10px;
}

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

/* Main Content Grid */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    flex: 1;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.card {
    background: var(--bg-color);
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 8px;
    padding: 1.5rem;
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
}

.card h3 {
    margin-bottom: 10px;
}

/* Forms */
.newsletter {
    background: var(--secondary-bg);
    padding: 3rem 1rem;
    text-align: center;
    margin-top: 3rem;
}

.form-group {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 1rem;
    flex-wrap: wrap;
}

input[type="email"], input[type="text"] {
    padding: 10px 15px;
    border: 1px solid #ccc;
    border-radius: 4px;
    min-width: 250px;
    font-size: 1rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background-color: var(--bg-color);
    border-top: 1px solid rgba(0,0,0,0.05);
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.7;
}

/* Utilities */
img.fluid {
    max-width: 100%;
    height: auto;
}

/* Mobile Navigation Toggle */
.mobile-menu-toggle {
    display: none !important;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    :root {
        --nav-height: auto;
    }

    header {
        padding: 1rem;
        height: auto;
        flex-direction: column;
        gap: 0.75rem;
    }

    nav ul {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }

    nav a {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }

    .hero {
        padding: 3rem 1.5rem;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

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

    .container {
        padding: 1.5rem;
    }

    .grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .btn {
        padding: 12px 20px;
        font-size: 0.95rem;
    }

    .cta-group {
        display: flex;
        flex-direction: column;
        gap: 0.75rem;
        width: 100%;
        max-width: 300px;
    }

    .btn-secondary {
        margin-left: 0;
    }

    .form-group {
        flex-direction: column;
        gap: 0.75rem;
    }

    input[type="email"], input[type="text"] {
        width: 100%;
        min-width: auto;
    }

    footer {
        font-size: 0.8rem;
        padding: 1.5rem 1rem;
    }
}

/* Tablet Responsive */
@media (min-width: 769px) and (max-width: 1024px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
    }

    header {
        padding: 0 1.5rem;
    }

    .container {
        padding: 2rem 1.5rem;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .logo {
        font-size: 1rem;
    }

    .logo img {
        height: 24px;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .hero p {
        font-size: 0.9rem;
    }

    .card {
        padding: 1rem;
    }
}