/* =========================
   GLOBAL RESET
========================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    line-height: 1.7;
    background: #f4f6f8;
    color: #1f2937;
}

/* =========================
   HEADER
========================= */
header {
    background: linear-gradient(135deg, #0f172a, #1e3a8a);
    color: white;
    padding: 28px 20px;
}

header h1 {
    font-size: 1.8rem;
    margin-bottom: 6px;
}

header p {
    opacity: 0.9;
    font-size: 0.95rem;
}

/* NAVIGATION */
nav {
    margin-top: 14px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.08);
    transition: 0.2s ease;
    font-size: 0.9rem;
}

nav a:hover {
    background: rgba(255, 255, 255, 0.18);
    transform: translateY(-1px);
}

/* =========================
   MAIN LAYOUT
========================= */
main {
    max-width: 1000px;
    margin: 30px auto;
    padding: 0 20px;
}

/* =========================
   SECTIONS (CARD DESIGN)
========================= */
section {
    background: white;
    padding: 22px;
    margin-bottom: 18px;
    border-radius: 14px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.06);
    transition: 0.2s ease;
}

section:hover {
    transform: translateY(-2px);
}

h2 {
    font-size: 1.4rem;
    margin-bottom: 12px;
    color: #0f172a;
}

/* =========================
   TEXT STYLING
========================= */
p {
    margin-bottom: 10px;
}

strong {
    color: #1d4ed8;
}

/* =========================
   LISTS
========================= */
ul, ol {
    margin-left: 18px;
    margin-top: 10px;
}

li {
    margin-bottom: 6px;
}

/* =========================
   ROADMAP (INDEX PAGE)
========================= */
.roadmap {
    display: grid;
    gap: 12px;
    margin-top: 15px;
}

.step {
    background: #f8fafc;
    border-left: 5px solid #1d4ed8;
    padding: 14px 16px;
    border-radius: 10px;
}

.step h3 {
    margin-bottom: 6px;
    color: #0f172a;
}

/* =========================
   BUTTONS
========================= */
button {
    background: #1d4ed8;
    color: white;
    border: none;
    padding: 10px 14px;
    border-radius: 10px;
    cursor: pointer;
    margin-top: 10px;
    margin-right: 8px;
    font-size: 0.95rem;
    transition: 0.2s ease;
}

button:hover {
    background: #2563eb;
    transform: translateY(-1px);
}

/* =========================
   QUIZ AREA
========================= */
#quiz-container button {
    display: block;
    width: 100%;
    margin: 8px 0;
    background: #334155;
}

#quiz-container button:hover {
    background: #475569;
}

#feedback {
    margin-top: 10px;
    font-weight: bold;
}

/* =========================
   FOOTER
========================= */
footer {
    text-align: center;
    padding: 18px;
    margin-top: 30px;
    background: #0f172a;
    color: white;
    font-size: 0.9rem;
}

/* =========================
   RESPONSIVE DESIGN
========================= */
@media (max-width: 700px) {
    header h1 {
        font-size: 1.4rem;
    }

    nav {
        flex-direction: column;
    }

    section {
        padding: 16px;
    }
}