* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Poppins", sans-serif;
}

body {
    background: #f7f9fc;
    color: #333;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #111;
    color: #fff;
    padding: 18px 50px;
}

header .logo {
    font-weight: 600;
    font-size: 1.3em;
}

nav a {
    color: #dcdcdc;
    text-decoration: none;
    margin-left: 25px;
    transition: 0.3s;
}

nav a:hover,
nav a.active {
    color: #fff;
}

/* Intro */
.intro {
    text-align: center;
    margin: 60px auto 30px;
    padding: 0 20px;
}

.intro h1 {
    font-size: 2.2em;
    margin-bottom: 10px;
    color: #1b1b1b;
}

.intro p {
    color: #555;
    font-size: 1.1em;
}

/* Cards */
.card {
    width: 90%;
    max-width: 850px;
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    margin: 25px auto;
    padding: 35px;
}

.card h2 {
    font-size: 1.6em;
    margin-bottom: 15px;
    color: #222;
}

.card p {
    margin-bottom: 10px;
    color: #555;
}

/* Checklists (no bullets) */
.checklist div {
    background: #f3f7ff;
    padding: 12px 16px;
    border-radius: 12px;
    margin-bottom: 10px;
}

.checklist.wrong div {
    background: #ffecec;
}

/* Modern link cards */
.links {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 15px;
}

.link-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 18px;
    background: #f7faff;
    border-radius: 14px;
    text-decoration: none;
    color: #1b1b1b;
    font-weight: 500;
    box-shadow: 0 2px 10px rgba(0,0,0,0.04);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid #e6eef9;
}

.link-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 18px rgba(0,0,0,0.08);
}

.link-card .icon {
    font-size: 1.2em;
    opacity: 0.7;
}


/* Footer */
footer {
    text-align: center;
    padding: 25px;
    margin-top: 40px;
    color: #666;
    font-size: 0.9em;
}