/* === TEACHING PAGE STYLING === */

:root {
    --tea-primary: #084c8b;
    --tea-secondary: #063a6b;
    --tea-white: #ffffff;
    --tea-text-dark: #2c3e50;
    --tea-text-muted: #6c757d;
    --tea-gradient: linear-gradient(135deg, var(--tea-primary) 0%, var(--tea-secondary) 100%);
    --tea-radius: 12px;
    --tea-transition: all 0.25s ease;
}

.teaching-header {
    background: var(--tea-gradient);
    color: var(--tea-white);
    padding: 26px 20px 22px;
    margin-bottom: 24px;
    text-align: center;
    border-radius: 0 0 var(--tea-radius) var(--tea-radius);
}
.teaching-header-content { max-width: 820px; margin: 0 auto; }
.teaching-header .header-icon { font-size: 1.9rem; margin-bottom: 4px; opacity: 0.95; }
.teaching-title { font-size: 1.95rem; font-weight: 700; margin-bottom: 6px; letter-spacing: -0.5px; }
.teaching-subtitle { font-size: 1.02rem; opacity: 0.9; line-height: 1.5; margin: 0 auto; max-width: 640px; }

.teaching-content { max-width: 1000px; margin: 0 auto 40px; padding: 0 20px; }

.teaching-sec-title {
    display: flex; align-items: center; gap: 10px;
    font-size: 1.35rem; font-weight: 700; color: var(--tea-text-dark);
    border-left: 4px solid var(--tea-primary); padding-left: 12px; margin: 30px 0 16px;
}

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

.course-row {
    padding: 12px 0;
    border-bottom: 1px solid #e9ecef;
}
.course-row:last-child { border-bottom: none; }

.course-row-head {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 10px;
}

.course-code {
    flex-shrink: 0;
    font-size: 0.82rem; font-weight: 700; color: var(--tea-primary);
    background: rgba(8,76,139,0.08);
    padding: 3px 9px; border-radius: 6px; white-space: nowrap;
}
.course-row.current .course-code { color: #2e7d32; background: rgba(46,125,50,0.1); }

.course-name { font-size: 1.02rem; font-weight: 700; color: var(--tea-text-dark); line-height: 1.35; }

.course-sessions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
}

.session-chip {
    display: inline-flex; align-items: center; gap: 5px;
    font-size: 0.82rem; color: var(--tea-text-muted);
    background: rgba(0,0,0,0.03);
    border: 1px solid rgba(0,0,0,0.06);
    padding: 4px 10px; border-radius: 20px;
}
.session-chip i { color: var(--tea-text-muted); }
.session-chip.current {
    color: #2e7d32;
    background: rgba(46,125,50,0.08);
    border-color: rgba(46,125,50,0.25);
    font-weight: 600;
}
.session-chip.current i { color: #2e7d32; }

/* Past Courses toggle */
.teaching-collapse-btn {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-top: 30px;
    padding: 12px 16px;
    background: #f8f9fa;
    border: 1px solid rgba(0,0,0,0.08);
    border-radius: 8px;
    color: var(--tea-text-dark);
    font-weight: 700;
    font-size: 1.05rem;
    text-align: left;
    cursor: pointer;
    transition: var(--tea-transition);
}
.teaching-collapse-btn:hover { background: #eef1f4; border-color: rgba(0,0,0,0.15); }
.teaching-collapse-btn[aria-expanded="true"] {
    background: rgba(8,76,139,0.06);
    border-color: var(--tea-primary);
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}
.teaching-collapse-label { display: inline-flex; align-items: center; gap: 10px; }
.teaching-collapse-count {
    background: rgba(8,76,139,0.1); color: var(--tea-primary);
    font-size: 0.78rem; font-weight: 700;
    padding: 2px 9px; border-radius: 20px;
}
.teaching-collapse-caret { transition: transform 0.25s ease; color: var(--tea-primary); }
.teaching-collapse-btn[aria-expanded="true"] .teaching-collapse-caret { transform: rotate(180deg); }

#pastCourses { border: 1px solid var(--tea-primary); border-top: none; border-bottom-left-radius: 8px; border-bottom-right-radius: 8px; padding: 16px; }

.teaching-empty { text-align: center; color: var(--tea-text-muted); padding: 50px 20px; }

@media (max-width: 768px) {
    .teaching-header { padding: 20px 15px 18px; }
    .teaching-title { font-size: 1.6rem; }
    .teaching-subtitle { font-size: 0.95rem; }
    .teaching-sec-title { font-size: 1.18rem; }
    .course-row-head { flex-direction: column; align-items: flex-start; gap: 4px; }
}