/* ===== BODY ===== */
body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f9f9f9;
    color: #333;
}

/* ===== HEADER ===== */
header {
    background: #222;
    color: white;
    padding: 15px;
    text-align: center;
    font-size: 1.5rem;
}

/* ===== CONTAINER LAYOUT ===== */
.container {
    display: flex;
    min-height: 80vh;
}

/* ===== SIDEBAR ===== */
.sidebar {
    width: 220px;
    background: #333;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sidebar button {
    padding: 10px;
    border: none;
    background: #444;
    color: white;
    cursor: pointer;
    border-radius: 5px;
    transition: 0.3s;
    font-size: 14px;
    text-align: left;
}

.sidebar button:hover {
    background: #007bff;
}

/* ===== MAIN CONTENT ===== */
.content {
    flex: 1;
    padding: 20px;
}

/* ===== CONTENT SECTIONS ===== */
.content-section {
    display: none;
}

.content-section.active {
    display: block;
}

/* ===== ACTIVITY CARDS ===== */
.activity-card {
    background: #f4f4f4;
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 6px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.activity-card h2 {
    margin-top: 0;
    font-size: 1.1rem;
}

.activity-card button {
    padding: 8px 12px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

/* ===== EXERCISE CARDS ===== */
.exercise-card {
    background: #f4f4f4;
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 6px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.exercise-card h2 {
    margin-top: 0;
    font-size: 1.1rem;
}

.exercise-card button {
    background-color: #4CAF50;
    color: white;
    padding: 10px 15px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.exercise-card button:hover {
    background-color: #45a049;
}

/* ===== INPUTS ===== */
.exercise-card input[type="text"],
.exercise-card input[type="number"] {
    padding: 6px;
    margin: 5px 5px 5px 0;
    border-radius: 4px;
    border: 1px solid #ccc;
}

/* ===== LISTS ===== */
.exercise-card ul {
    padding-left: 20px;
}

/* ===== FOOTER ===== */
footer {
    background: #222;
    color: white;
    text-align: center;
    padding: 10px;
}

/* ===== DARK MODE ===== */
body.dark-mode {
    background-color: #121212;
    color: #e0e0e0;
}

body.dark-mode .exercise-card {
    background-color: #1e1e1e;
}

/* ===== GRADE CALCULATOR (SCOPED FIX) ===== */
.exercise-card input {
    width: 100%;
}

.exercise-card p {
    font-weight: bold;
}

.main-content {
  max-width: 600px;
  margin: 30px auto;
}
.content-section {
  display: none;
}

.content-section.active {
  display: block;
}