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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: #2c2c2c;
    line-height: 1.7;

    background-image: url("bg.png");
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

/* layout */
.container {
    max-width: 900px;
    margin: auto;
    padding: 2rem 1.5rem;
}

/* header */
.header {
    background: #ffffff;
    border-bottom: 1px solid #e0e0e0;
}

.logo {
    font-size: 1.4rem;
    font-weight: 600;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav a {
    margin-left: 1.2rem;
    text-decoration: none;
    color: #444;
    font-weight: 500;
}

nav a:hover {
    color: #000;
}

/* sections */
.card {
    background: #ffffff;
    padding: 2.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.card h2 {
    margin-bottom: 1.5rem;
    font-size: 1.6rem;
}

.card p {
    margin-bottom: 1rem;
}

.muted {
    opacity: 0.7;
}

/* footer */
.footer {
    text-align: center;
    padding: 2rem;
    color: #777;
}
.hidden {
    display: none;
}

/* HERO */
.hero {
    text-align: center;
}

.hero h2 {
    font-size: 2.2rem;
    letter-spacing: 1px;
    margin-bottom: 1.5rem;
}

.hero-text {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.hero-note {
    font-size: 0.95rem;
    opacity: 0.8;
}