/* Dopamin Study - Global Styles */

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #10b981;
    --background: #0f172a;
    --surface: #1e293b;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --error: #ef4444;
    --success: #22c55e;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--background);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

/* Navigation */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--surface);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    text-decoration: none;
}

.nav-brand img {
    width: min(120px, 25vw);
    height: auto;
    object-fit: contain;
}

.nav-links a {
    color: var(--text);
    text-decoration: none;
    margin-left: 2rem;
    transition: color 0.2s;
}

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

/* Hero Section */
.hero {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 3rem;
}

/* Feature Cards */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.feature-card {
    background: var(--surface);
    padding: 2rem;
    border-radius: 1rem;
    border: 1px solid rgba(255,255,255,0.1);
    transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
}

.feature-card h3 {
    color: var(--primary);
    margin-bottom: 0.5rem;
}

/* CTA Button */
.cta-button {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 1rem 2.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: background 0.2s, transform 0.2s;
}

.cta-button:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

/* Forms */
.form-container {
    max-width: 400px;
    margin: 2rem auto;
    padding: 2rem;
    background: var(--surface);
    border-radius: 1rem;
    border: 1px solid rgba(255,255,255,0.1);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 0.5rem;
    background: var(--background);
    color: var(--text);
    font-size: 1rem;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
}

.btn {
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

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

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

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-top: 4rem;
}

/* Utility Classes */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.text-muted { color: var(--text-muted); }
.text-error { color: var(--error); }
.text-success { color: var(--success); }

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

    .navbar {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links a {
        margin-left: 1rem;
    }
}