/* Course requirements page */
.requirements-page {
    --requirements-accent: #7c83ff;
    --requirements-cyan: #4fd1c5;
    background:
        radial-gradient(circle at 90% 0%, rgba(99, 102, 241, 0.15), transparent 28rem),
        var(--bg-primary);
}

.requirements-header {
    padding-bottom: 2.6rem;
}

.requirements-kicker,
.eyebrow,
.sidebar-label {
    color: var(--requirements-cyan);
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.13em;
    text-transform: uppercase;
}

.requirements-header h1 {
    max-width: 780px;
    margin-top: 0.7rem;
    font-size: clamp(2rem, 5vw, 3.9rem);
    letter-spacing: -0.04em;
}

.requirements-layout {
    display: grid;
    grid-template-columns: 235px minmax(0, 1fr);
    gap: 2.25rem;
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem 1.5rem 4rem;
}

.requirements-sidebar {
    position: sticky;
    top: 1.5rem;
    align-self: start;
}

.sidebar-label {
    margin-bottom: 0.75rem;
    color: var(--text-muted);
}

.fach-nav {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.fach-nav a {
    display: flex;
    align-items: baseline;
    gap: 0.65rem;
    padding: 0.55rem 0.65rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.86rem;
    line-height: 1.35;
}

.fach-nav a:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.fach-nav span {
    min-width: 1.45rem;
    color: var(--requirements-accent);
    font-family: 'SF Mono', 'Menlo', monospace;
    font-size: 0.72rem;
}

.sidebar-note {
    margin-top: 1.5rem;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: rgba(28, 28, 38, 0.72);
    color: var(--text-secondary);
    font-size: 0.82rem;
    line-height: 1.55;
}

.sidebar-note strong {
    display: block;
    margin-bottom: 0.35rem;
    color: var(--text-primary);
    font-size: 0.85rem;
}

.requirements-content {
    min-width: 0;
}

.requirements-intro {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 2rem;
    align-items: end;
    padding: 2rem;
    border: 1px solid rgba(124, 131, 255, 0.32);
    border-radius: calc(var(--radius) + 4px);
    background:
        linear-gradient(135deg, rgba(99, 102, 241, 0.18), transparent 62%),
        var(--bg-card);
    box-shadow: 0 18px 55px rgba(0, 0, 0, 0.2);
}

.requirements-intro h2 {
    max-width: 680px;
    margin-top: 0.55rem;
    font-size: clamp(1.55rem, 3vw, 2.35rem);
    letter-spacing: -0.03em;
}

.requirements-intro p {
    max-width: 700px;
    margin-top: 0.85rem;
    color: var(--text-secondary);
}

.intro-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(72px, 1fr));
    gap: 0.5rem;
}

.intro-stats div {
    min-width: 75px;
    padding: 0.75rem;
    border-left: 1px solid var(--border);
}

.intro-stats strong,
.intro-stats span {
    display: block;
}

.intro-stats strong {
    color: var(--text-primary);
    font-size: 1.6rem;
    line-height: 1;
}

.intro-stats span {
    margin-top: 0.35rem;
    color: var(--text-muted);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.requirements-alert {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
    margin: 1.25rem 0 2.5rem;
    padding: 0.9rem 1rem;
    border: 1px solid rgba(245, 158, 11, 0.28);
    border-radius: var(--radius-sm);
    background: rgba(245, 158, 11, 0.08);
    color: var(--text-secondary);
    font-size: 0.86rem;
}

.requirements-alert p {
    margin: 0;
}

.requirements-filter-panel {
    margin: 1.5rem 0 2.5rem;
    padding: 1.35rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: rgba(28, 28, 38, 0.72);
}

.filter-panel-heading {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: end;
}

.filter-panel-heading h2 {
    margin-top: 0.35rem;
    font-size: 1.2rem;
}

.filter-panel-heading p {
    margin-top: 0.3rem;
    color: var(--text-muted);
    font-size: 0.84rem;
}

.filter-panel-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    align-items: center;
    justify-content: flex-end;
}

.filter-result-count {
    color: var(--text-secondary);
    font-size: 0.8rem;
    white-space: nowrap;
}

.filter-clear {
    padding: 0.42rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    font: inherit;
    font-size: 0.78rem;
}

.filter-clear:hover:not(:disabled) {
    border-color: var(--requirements-accent);
    color: var(--text-primary);
}

.filter-clear:disabled {
    cursor: not-allowed;
    opacity: 0.45;
}

.requirement-filter-options {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.15rem;
}

.requirement-filter-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.5rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    font: inherit;
    font-size: 0.8rem;
    transition: all var(--transition);
}

.requirement-filter-chip:hover,
.requirement-filter-chip.is-active {
    border-color: var(--requirements-accent);
    background: rgba(124, 131, 255, 0.14);
    color: var(--text-primary);
}

.filter-chip-dot {
    width: 0.45rem;
    height: 0.45rem;
    border-radius: 50%;
    background: var(--text-muted);
    transition: background var(--transition), box-shadow var(--transition);
}

.requirement-filter-chip.is-active .filter-chip-dot {
    background: var(--requirements-cyan);
    box-shadow: 0 0 0 3px rgba(79, 209, 197, 0.13);
}

.requirements-alert strong {
    color: var(--text-primary);
}

.alert-mark {
    display: grid;
    width: 1.35rem;
    height: 1.35rem;
    flex: 0 0 auto;
    place-items: center;
    border-radius: 50%;
    background: var(--warning);
    color: #1c1c26;
    font-weight: 800;
}

.fach-section {
    scroll-margin-top: 1.2rem;
    margin-top: 3rem;
}

.fach-heading {
    display: flex;
    justify-content: space-between;
    gap: 1.5rem;
    align-items: end;
    margin-bottom: 1rem;
    padding-bottom: 0.9rem;
    border-bottom: 1px solid var(--border);
}

.fach-number {
    display: block;
    margin-bottom: 0.25rem;
    color: var(--requirements-accent);
    font-family: 'SF Mono', 'Menlo', monospace;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
}

.fach-heading h2 {
    font-size: clamp(1.35rem, 2.4vw, 2rem);
    letter-spacing: -0.025em;
}

.fach-heading p {
    margin-top: 0.25rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.fach-sources {
    display: flex;
    gap: 0.45rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.fach-sources a,
.source-link {
    color: var(--requirements-cyan);
    font-size: 0.78rem;
}

.fach-sources a {
    padding: 0.38rem 0.6rem;
    border: 1px solid rgba(79, 209, 197, 0.25);
    border-radius: 999px;
    background: rgba(79, 209, 197, 0.07);
}

.fach-sources a:hover,
.source-link:hover {
    color: var(--text-primary);
}

.course-list {
    display: grid;
    gap: 0.75rem;
}

.course-card {
    padding: 1.25rem 1.35rem 1.05rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-card);
    transition: border-color var(--transition), transform var(--transition), background var(--transition);
}

.course-card:hover {
    border-color: rgba(124, 131, 255, 0.5);
    background: #20202c;
    transform: translateY(-1px);
}

.course-card-top {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: center;
}

.course-code {
    color: var(--requirements-accent);
    font-family: 'SF Mono', 'Menlo', monospace;
    font-size: 0.85rem;
    font-weight: 700;
}

.semester-badge {
    padding: 0.25rem 0.55rem;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.06em;
}

.semester-badge.summer {
    background: rgba(79, 209, 197, 0.13);
    color: var(--requirements-cyan);
}

.semester-badge.winter {
    background: rgba(124, 131, 255, 0.14);
    color: #aeb2ff;
}

.course-card h3 {
    max-width: 850px;
    margin-top: 0.65rem;
    font-size: 1.15rem;
    line-height: 1.35;
}

.course-flags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-top: 0.65rem;
}

.course-flag {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.2rem 0.48rem;
    border: 1px solid rgba(160, 160, 176, 0.18);
    border-radius: 999px;
    background: rgba(160, 160, 176, 0.08);
    color: var(--text-secondary);
    font-size: 0.7rem;
    font-weight: 600;
    line-height: 1.2;
}

.course-flag::before {
    content: '';
    width: 0.4rem;
    height: 0.4rem;
    border-radius: 50%;
    background: currentColor;
    opacity: 0.8;
}

.flag-exam { color: #aeb2ff; background: rgba(124, 131, 255, 0.12); border-color: rgba(124, 131, 255, 0.25); }
.flag-project { color: #80d8a4; background: rgba(34, 197, 94, 0.1); border-color: rgba(34, 197, 94, 0.22); }
.flag-written { color: #e9b2ff; background: rgba(192, 132, 252, 0.1); border-color: rgba(192, 132, 252, 0.22); }
.flag-presentation { color: #f5c27a; background: rgba(245, 158, 11, 0.1); border-color: rgba(245, 158, 11, 0.22); }
.flag-quiz { color: #8dd8ed; background: rgba(79, 209, 197, 0.1); border-color: rgba(79, 209, 197, 0.22); }
.flag-participation { color: #c2c7d6; background: rgba(194, 199, 214, 0.09); border-color: rgba(194, 199, 214, 0.2); }
.flag-attendance { color: #ff9c9c; background: rgba(239, 68, 68, 0.11); border-color: rgba(239, 68, 68, 0.25); }
.flag-ai { color: #ffa9c9; background: rgba(236, 72, 153, 0.1); border-color: rgba(236, 72, 153, 0.23); }
.flag-incomplete { color: var(--warning); background: rgba(245, 158, 11, 0.1); border-color: rgba(245, 158, 11, 0.23); }

.course-card[hidden],
.fach-section[hidden] {
    display: none;
}

.course-details {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.course-details > div {
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

.course-details h4 {
    color: var(--text-muted);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.course-details p {
    margin-top: 0.35rem;
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.6;
}

.source-link {
    display: inline-block;
    margin-top: 1rem;
}

.requirements-footer {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 3rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.82rem;
}

.requirements-footer p {
    max-width: 650px;
}

.requirements-footer a {
    color: var(--text-secondary);
}

.requirements-footer a:hover {
    color: var(--requirements-cyan);
}

@media (max-width: 1000px) {
    .requirements-layout {
        grid-template-columns: 1fr;
    }

    .requirements-sidebar {
        position: static;
    }

    .fach-nav {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .sidebar-note {
        display: none;
    }
}

@media (max-width: 650px) {
    .requirements-layout {
        padding: 1.25rem 1rem 3rem;
    }

    .requirements-intro {
        grid-template-columns: 1fr;
        padding: 1.35rem;
    }

    .intro-stats {
        grid-template-columns: repeat(3, 1fr);
    }

    .intro-stats div {
        padding: 0.55rem;
    }

    .intro-stats strong {
        font-size: 1.25rem;
    }

    .fach-nav {
        grid-template-columns: 1fr;
    }

    .fach-heading,
    .requirements-footer {
        align-items: flex-start;
        flex-direction: column;
    }

    .fach-sources {
        justify-content: flex-start;
    }

    .course-card {
        padding: 1rem;
    }

    .course-details {
        grid-template-columns: 1fr;
        gap: 0.85rem;
    }

    .filter-panel-heading {
        align-items: flex-start;
        flex-direction: column;
    }

    .filter-panel-actions {
        justify-content: flex-start;
    }
}