/* RESET & BASICS */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f6f8;
    scroll-behavior: smooth;
}

a { color: #0066cc; text-decoration: none; }
a:hover { text-decoration: underline; }

/* NAVIGATION */
.navbar {
    background: #2c3e50;
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand { font-weight: bold; font-size: 1.2rem; }

.nav-links { list-style: none; display: flex; gap: 20px; }
.nav-links a { color: #ecf0f1; font-weight: 500; }

.contact-btn {
    background: #3498db;
    padding: 5px 12px;
    border-radius: 4px;
    transition: background 0.3s;
}
.contact-btn:hover { background: #2980b9; text-decoration: none; }

/* MAIN CONTAINER */
.container {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
}

/* SECTIONS */
.section {
    background: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 40px;
    scroll-margin-top: 80px;
}

h1 { font-size: 2.5rem; margin-bottom: 0.5rem; color: #2c3e50; }
h2 { font-size: 1.8rem; margin-bottom: 1rem; color: #2c3e50; border-bottom: 2px solid #eee; padding-bottom: 10px; }
h3 { font-size: 1.2rem; margin-top: 1.5rem; margin-bottom: 0.5rem; color: #34495e; }
h4 { font-size: 1.0rem; margin-top: 1.0rem; margin-bottom: 0.5rem; color: #555; font-weight: bold; }

p { margin-bottom: 1rem; }
li { margin-bottom: 0.5rem; }
ul { margin-left: 20px; margin-bottom: 1rem; }

.subtitle { font-size: 1.2rem; color: #7f8c8d; margin-bottom: 2rem; }
.date { font-size: 0.9rem; color: #7f8c8d; margin-bottom: 20px; font-style: italic; }

/* ABOUT GRID */
.hero { text-align: center; }
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 30px;
}
.feature {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 6px;
    border-left: 4px solid #3498db;
}
.feature h3 { margin-top: 0; font-size: 1rem; }
.feature p { font-size: 0.9rem; margin-bottom: 0; }

hr { border: 0; height: 1px; background: #ddd; margin: 40px 0; }
footer { text-align: center; color: #95a5a6; font-size: 0.9rem; padding-bottom: 40px; }

/* RESPONSIVE */
@media (max-width: 600px) {
    .section { padding: 25px; }
    h1 { font-size: 2rem; }
}