/* RESET & BASICS */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f4f9f9; /* Soft sleep-friendly blue-grey */
    color: #2c3e50;
    line-height: 1.6;
}

/* LAYOUT UTILITIES */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* NAVIGATION */
nav {
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-weight: 800;
    font-size: 1.5rem;
    color: #2c3e50;
    letter-spacing: -0.5px;
}
.logo span { color: #3498db; } /* Accent color */

/* HERO SECTION */
.hero {
    text-align: center;
    padding: 100px 20px;
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    margin-top: 40px;
}
h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    line-height: 1.1;
}
.tagline {
    font-size: 1.5rem;
    color: #7f8c8d;
    margin-bottom: 40px;
    font-weight: 300;
}

/* BUTTONS */
.btn {
    display: inline-block;
    padding: 15px 30px;
    background-color: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: transform 0.2s, background 0.2s;
}
.btn:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}
.btn-secondary {
    background-color: transparent;
    color: #3498db;
    border: 2px solid #3498db;
    margin-left: 10px;
}
.btn-secondary:hover {
    background-color: #eaf6fc;
}

/* FEATURES GRID */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    padding: 80px 0;
}
.feature-card {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
}
.feature-icon { font-size: 2rem; margin-bottom: 15px; }
.feature-title { font-weight: 700; margin-bottom: 10px; }

/* FOOTER */
footer {
    text-align: center;
    padding: 40px 0;
    color: #95a5a6;
    font-size: 0.9rem;
    border-top: 1px solid #eee;
    margin-top: 40px;
}

/* MOBILE TWEAKS */
@media (max-width: 600px) {
    h1 { font-size: 2.5rem; }
    .hero { padding: 60px 20px; }
    .btn { display: block; margin: 10px 0; width: 100%; text-align: center; }
    .btn-secondary { margin-left: 0; }
}