:root {
    --hunter-green: #386641ff;
    --asparagus: #6a994eff;
    --yellow-green: #a7c957ff;
    --parchment: #f2e8cfff;
    --bittersweet-shimmer: #bc4749ff;
    --yellow-green-light: #e4f2d1;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --dark-green: #2d6a4f;
    --medium-green: #40916c;
    --light-green: #74c69d;
    --pale-green: #d8f3dc;
    --shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    --bg-light: #f2e8cf;
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
}

body {
    font-family: var(--font-family);
    margin: 0;
    color: #1a1a1a;
}

h1 {
    text-align: center;
    font-weight: bold;
    /*box-shadow: var(--shadow);*/
    color: black;
    
}

header {
    background: linear-gradient(90deg, var(--medium-green), var(--light-green));
    color: white;
    padding: 5px 0;
    font-weight: bold;
    box-shadow: var(--shadow);
}

header p {
    margin-left: 15px;
}

.intro {
    border: 2px solid var(--light-green);
    border-radius: 10px;
    padding: 30px;
    max-width: 1200px;
    margin: 30px auto;
    text-align: center;
    background-color: white;
    box-shadow: var(--shadow);
}

.intro h1 {
    margin-top: 0;
    margin-bottom: 20px;
    color: var(--dark-green);
}

.nav-links {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.nav-links a {
    text-decoration: none;
    font-weight: bold;
    padding: 10px 15px;
    border-radius: 8px;
    color: var(--dark-green);
    transition: background-color 0.5s ease;
}

.nav-links a:hover {
    background-color: var(--light-green);
    color: white;
}

.main-content {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px 100px 20px;
}

.class-header {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 30px;
}

.info-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.info-card {
    background: linear-gradient(135deg, var(--light-green), #52b788);
    border-radius: 12px;
    padding: 25px;
    box-shadow: var(--shadow-md);
    text-align: center;
    color: white;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.info-label {
    font-size: 14px;
    font-weight: 600;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.info-value {
    font-size: 36px;
    font-weight: bold;
    margin-bottom: 12px;
}

.invite-btn {
    display: inline-block;
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 8px 16px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 12px;
    transition: background-color 0.3s ease;
    border: 2px solid white;
}

.invite-btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

.content-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.section-block {
    background-color: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow-md);
    border-left: 5px solid var(--medium-green);
    transition: box-shadow 0.3s ease;
}

.section-block:hover {
    box-shadow: var(--shadow-lg);
}

.section-block h3 {
    color: var(--dark-green);
    margin-top: 0;
    margin-bottom: 20px;
    font-size: 22px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.section-actions .btn {
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.section-actions .btn-primary {
    background-color: var(--medium-green);
    color: white;
}

.section-actions .btn-primary:hover {
    background-color: var(--dark-green);
    box-shadow: var(--shadow-md);
}

.section-actions .btn-secondary {
    background-color: var(--yellow-green-light);
    color: var(--dark-green);
    border: 2px solid var(--light-green);
}

.section-actions .btn-secondary:hover {
    background-color: var(--light-green);
    color: white;
    box-shadow: var(--shadow-md);
}

.subjects-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.subjects-list li {
    margin-bottom: 10px;
}

.subjects-list a {
    display: block;
    padding: 12px 16px;
    background-color: var(--pale-green);
    color: var(--dark-green);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
}

.subjects-list a:hover {
    background-color: var(--light-green);
    color: white;
    border-left-color: var(--medium-green);
    box-shadow: var(--shadow-md);
}

.empty-state {
    color: #999;
    font-style: italic;
    padding: 20px;
    text-align: center;
    background-color: var(--pale-green);
    border-radius: 8px;
}

.btn-edit {
    display: inline-block;
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--medium-green), var(--dark-green));
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    border: none;
}

.btn-edit:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.alert {
    padding: 15px 20px;
    margin-bottom: 20px;
    border-radius: 8px;
    border-left: 5px solid;
}

.alert-success {
    background-color: #d8f3dc;
    color: #1b4332;
    border-left-color: var(--medium-green);
}

.sidebar {
    width: 250px;
    border-left: 2px solid var(--medium-green);
    padding: 20px;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    background-color: white;
    overflow-y: auto;
    box-shadow: -2px 0 6px rgba(0, 0, 0, 0.1);
    z-index: 1001;
    background: linear-gradient(to bottom, var(--bg-light), #ffffff);
}

.sidebar h2 {
    color: var(--dark-green);
    text-align: center;
    border-bottom: 2px solid var(--light-green);
    padding-bottom: 10px;
    margin-bottom: 10px;
}

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

.sidebar li {
    margin-bottom: 12px;
}

.sidebar a {
    text-decoration: none;
    color: var(--medium-green);
    font-weight: 600;
    display: block;
    padding: 10px;
    border-radius: 6px;
    transition: background-color 0.5s ease;
}

.sidebar a:hover {
    background-color: var(--light-green);
    color: white;
}

footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0px;
    text-align: center;
    padding: 5px 0;
    background-color: var(--medium-green);
    color: white;
    border-top: 2px solid var(--dark-green);
    box-shadow: var(--shadow);
    z-index: 1000;
}