:root {
    color-scheme: dark;
    --bg: #0f172a;
    --card: #111827;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --border: #1f2937;
    --teal: #14b8a6;
    --red: #f87171;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: "Inter", "Segoe UI", system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
}
section{ margin-bottom: 40px; }
.secondary-text {
    color: var(--muted);
}
a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}
.container {
    max-width: 880px;
    margin: 0 auto;
    padding: 18px;
}
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    gap: 12px;
    flex-wrap: wrap;
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    font-size: 0.9rem;
}
.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
}
.user-link {
    color: var(--text);
    text-decoration: none;
    transition: color 0.2s;
}
.user-link:hover {
    color: var(--primary);
}
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 18px;
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.5);
}
.hidden{
    display: none !important;  
}
h1, h2 { margin-top: 0; }
h2 { margin-bottom: 8px; opacity:0.7; }
.muted { color: var(--muted); }
.text-small {
    font-size: 0.9rem;
}
.session-list {
    list-style: none;
    padding: 0;
    margin: 16px 0 0;
    display: grid;
    gap: 12px;
}
.session-item {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #0b1220;
}
.session-item.enrolled {
    border-color: var(--teal);
}
.session-item.under-minimum {
    border: 2px solid var(--red);
}
.session-inline {
    display: flex;
    align-items: center;
    align-content: center;
    text-align: center ;   
    justify-content: space-between;
    gap: 6px;
    width: 100%;
}
.session-right {
    display: flex;
    align-items: center;
}
.session-day {
    font-weight: 700;
    text-transform: capitalize;
}
.session-teacher {
    color: var(--red);
}
.month-title {
    margin: 20px 0 8px;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--teal);
}
.session-item-history {
    background: #0a1222;
}
.session-card {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #0b1220;
    margin-bottom: 12px;
}
.session-card.enrolled {
    border-color: var(--teal);
}
.session-card.past {
    opacity: 0.7;
}
.session-group {
    display: grid;
    gap: 8px;
}
.btn {
    border: none;
    border-radius: 6px;
    padding: 6px 8px;
    font-weight: 600;
    cursor: pointer;
    background: var(--primary);
    color: white;
    transition: background 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}
.btn:hover { background: var(--primary-dark); }
.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}
.btn-disabled {
    background: transparent;
    color: var(--red);
    border: 1px solid var(--red);
    cursor: not-allowed;
}
.btn-form{
    border: none;
    border-radius: 10px;
    padding: 10px 12px;
    font-weight: 600;
    cursor: pointer;
    background: var(--primary);
    color: white;
    transition: background 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
}
.full-label {
    color: var(--red);
    font-weight: 700;
    padding: 6px 10px;
    border: 1px solid var(--red);
    border-radius: 6px;
}
.closed-label {
    color: var(--muted);
    font-weight: 700;
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
}
.error {
    background: #7f1d1d;
    color: #fee2e2;
    padding: 10px 12px;
    border-radius: 10px;
    margin-bottom: 12px;
}
.form-card {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    background: #0b1220;
    margin-top: 12px;
}
form {
    display: grid;
    gap: 12px;
}
.form-group {
    display: grid;
    gap: 6px;
}
.form-group label {
    font-weight: 600;
    font-size: 0.9rem;
}
.form-input {
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid var(--border);
    font-size: 1rem;
    background: #0b1220;
    color: var(--text);
    font-family: inherit;
}
.form-input:focus {
    outline: none;
    border-color: var(--primary);
}
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}
.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}
.form-actions {
    margin-top: 8px;
}
.error-message {
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid var(--red);
    color: var(--red);
    padding: 12px 16px;
    border-radius: 10px;
    margin-bottom: 16px;
    font-weight: 500;
}
input, textarea {
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid var(--border);
    font-size: 1rem;
    background: #0b1220;
    color: var(--text);
}
textarea {
    min-height: 120px;
    resize: vertical;
}
.course-header {
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 12px;
}
.course-header h1 {
    margin-bottom: 4px;
}
.course-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #0b1220;
    color: inherit;
    text-decoration: none;
}
.course-card:hover {
    border-color: var(--primary);
}
.course-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin: 10px 0 20px;
}
.align-right {
    text-align: right;
}
.session-short-list {
    margin-top: 8px;
}
.session-short-item {
    background: #0b1220;
}
.session-short-line {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    width: 100%;
}
.session-short-date {
    font-weight: 600;
}
.participant-link {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}
.participant-link:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}
.user-sessions-header {
    margin-bottom: 24px;
}
.user-sessions-header h2 {
    margin-bottom: 4px;
}
@media (max-width: 640px) {
    .session-item {
        flex-direction: column;
        align-items: flex-start;
    }
    .session-right {
        width: 100%;
        justify-content: flex-start;
    }
    .session-right .btn,
    .session-right .btn-disabled {
        width: 100%;
    }
}