body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: #333;
    min-height: 100vh;
}

header {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: #fff;
    text-align: center;
    padding: 2rem 1rem;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.2rem;
    margin-top: 0.5rem;
}

main {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

section {
    margin-bottom: 2rem;
    padding: 2rem;
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

section:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.2);
}

.category-workouts {
    background: linear-gradient(135deg, #34495e, #2c3e50);
    color: #ecf0f1;
}

.category-workouts h2 {
    color: #e74c3c;
}

.category-diet {
    background: linear-gradient(135deg, #27ae60, #2ecc71);
    color: #fff;
}

.category-diet h2 {
    color: #f39c12;
}

.category-sleep {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: #fff;
}

.category-sleep h2 {
    color: #f1c40f;
}

.category-body-factors {
    background: linear-gradient(135deg, #e67e22, #d35400);
    color: #fff;
}

.category-body-factors h2 {
    color: #9b59b6;
}

section h2 {
    border-bottom: 3px solid #e74c3c;
    padding-bottom: 0.5rem;
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.video {
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    border-radius: 10px;
    color: #fff;
    border-left: 5px solid #fff;
    transition: transform 0.2s ease;
}

.video:hover {
    transform: scale(1.02);
}

.video h3 {
    margin-top: 0;
    color: #fff;
    font-size: 1.3rem;
}

.video button {
    background: rgba(255,255,255,0.2);
    color: #fff;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s ease;
}

.video button:hover {
    background: rgba(255,255,255,0.4);
}

.video p {
    margin: 0.5rem 0;
}

footer {
    text-align: center;
    padding: 1rem;
    background: linear-gradient(135deg, #2c3e50, #34495e);
    color: #fff;
    box-shadow: 0 0 10px rgba(0,0,0,0.2);
}

ul {
    list-style: none;
    padding: 0;
}

ul li {
    margin: 1rem 0;
}

ul li a {
    display: inline-block;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: #fff;
    text-decoration: none;
    border-radius: 10px;
    font-size: 1.2rem;
    font-weight: bold;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

ul li a:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.3);
    text-decoration: none;
}