.metrics-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
      margin-top: 12px;
    }

    .metric-card {
      background: var(--surface-elevated);
      border: 1px solid var(--surface-border);
      border-radius: 12px;
      padding: 14px;
      text-align: center;
      color: var(--text-primary);
      box-shadow: var(--shadow-soft);
      transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
    }

    .metric-card:hover {
      background: var(--surface-hover);
      border-color: color-mix(in srgb, var(--surface-border), var(--text-primary) 20%);
      transform: translateY(-1px);
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-secondary);
      margin-bottom: 6px;
    }

    .metric-value {
      font-size: 26px;
      font-weight: 600;
      color: var(--text-primary);
    }

    .metric-value.good {
      color: #22c55e;
    }

    .metric-value.bad {
      color: #ef4444;
    }

    /* Responsive */
    @media (max-width: 800px) {
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

/* ===============================
   Review Modal
   =============================== */
.review-modal {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
    padding-bottom: clamp(12px, 3vh, 20px);
}

.review-title {
    margin: 0 0 clamp(8px, 2vh, 16px);
    color: var(--text-primary);
}

.review-section-title {
    margin: 0;
    color: var(--text-primary);
}

.review-body {
    flex: 1;
    overflow: auto;
    min-height: 0;
    padding-top: clamp(12px, 3vh, 24px);
    padding-bottom: clamp(24px, 6vh, 48px);
    padding-right: 4px;
}

.review-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: clamp(8px, 2vh, 12px);
}

.review-section-header + * {
    margin-bottom: clamp(14px, 3vh, 20px);
}

.metrics-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
    margin-bottom: 18px;
}

.metrics-stats-card {
    background: var(--surface-elevated);
    border: 1px solid var(--surface-border);
    border-radius: 12px;
    padding: 12px;
    box-shadow: var(--shadow-soft);
}

.metrics-stats-title {
    font-weight: 600;
    margin-bottom: 8px;
}

.metrics-stats-row {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.review-row {
    padding: 14px;
    margin-bottom: 10px;
    border-radius: 12px;
    background: color-mix(in srgb, var(--accent-primary), transparent 90%);
    border: 1px solid color-mix(in srgb, var(--accent-primary), var(--surface-border) 55%);
    box-shadow: var(--shadow-soft);
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.review-row:hover {
    background: color-mix(in srgb, var(--accent-primary), transparent 85%);
    border-color: color-mix(in srgb, var(--accent-primary), var(--text-primary) 20%);
    transform: translateY(-1px);
}

.review-row-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.review-row-meta {
    margin-top: 4px;
}

.review-row.exam-row {
    padding: 12px;
}

.review-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.actions {
    margin-top: 16px;
    display: flex;
    justify-content: flex-end;
}

.question-card {
    background: var(--surface-elevated);
    border-radius: 12px;
    padding: 14px;
    margin-bottom: 12px;
    border: 1px solid var(--surface-border);
    box-shadow: var(--shadow-soft);
}

.question-card + .question-card {
    margin-top: 16px;
}

.question-title {
    padding-bottom: 6px;
    border-bottom: 1px dashed color-mix(in srgb, var(--surface-border), transparent 35%);
}

.question-title {
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.question-prompt {
    margin-top: 6px;
}

.question-answer {
    margin-top: 8px;
    opacity: 0.85;
}

.question-correct {
    margin-top: 6px;
    color: var(--accent-primary);
}

.metrics-section {
    margin-top: 12px;
}

.metrics-note {
    margin-top: 12px;
    opacity: 0.7;
    font-size: 14px;
}

:is(#testConfigModal, #studySetBuilderModal) .modal-backdrop {
    position: absolute;
    inset: 0;
    background: color-mix(in srgb, var(--surface-base), transparent 35%);
}

:is(#testConfigModal, #studySetBuilderModal) {
    position: fixed;
    inset: 0;
    z-index: 1000000;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: clamp(12px, 3vh, 24px);
}

:is(#testConfigModal, #studySetBuilderModal) .modal-box {
    position: relative;
    background: var(--surface-elevated);
    border: 2px solid var(--surface-border);
    border-radius: 16px;
    width: min(460px, 90vw);
    height: auto;
    max-height: 84vh;
    padding:
        clamp(10px, 2vh, 14px)
        clamp(16px, 3vw, 22px)
        clamp(16px, 3vh, 22px);
    font-size: calc(1rem * var(--ui-scale, 1));
    display: grid;
    grid-template-rows: auto minmax(0, 1fr) auto;
    overflow: hidden;
    box-shadow: var(--shadow-elevated);
}

:is(#testConfigModal, #studySetBuilderModal) .review-modal {
    width: min(760px, 90vw);
    max-height: 84vh;
}

:is(#testConfigModal, #studySetBuilderModal) .metrics-modal-close-x {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 24px;
    line-height: 1;
    cursor: pointer;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s ease, background 0.2s ease;
}

:is(#testConfigModal, #studySetBuilderModal) .metrics-modal-close-x:hover {
    color: var(--text-primary);
    background: color-mix(in srgb, var(--surface-hover), transparent 12%);
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding-right: 42px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--surface-border);
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-title {
    margin: 0;
    font-size: clamp(1.35rem, 2.6vw, 1.6rem);
    font-weight: 600;
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-subtitle {
    margin-top: 6px;
    color: var(--text-secondary);
    font-size: 14px;
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-badge {
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    background: color-mix(in srgb, var(--accent-primary), transparent 78%);
    color: var(--accent-primary);
    border: 1px solid color-mix(in srgb, var(--accent-primary), transparent 65%);
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin-top: 18px;
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 600;
}

#studySetBuilderModal .test-config-grid > .test-config-field > .test-config-label {
    display: flex;
    align-items: center;
    min-height: 22px;
}

#studySetBuilderModal .study-set-mode-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

#studySetBuilderModal .study-set-mode-section .mode-info-inline {
    justify-content: center;
}

#studySetBuilderModal .study-set-mode-section .test-config-select,
#studySetBuilderModal .study-set-mode-section .mode-info-box {
    width: min(100%, 360px);
}

#studySetBuilderModal .study-set-mode-section .test-config-select {
    text-align: center;
    text-align-last: center;
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-select {
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid var(--surface-border);
    background: var(--surface-base);
    color: var(--text-primary);
    font-size: 14px;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-select:hover {
    background: var(--surface-hover);
    border-color: color-mix(in srgb, var(--surface-border), var(--text-primary) 14%);
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-select:focus,
:is(#testConfigModal, #studySetBuilderModal) .test-config-select:focus-visible {
    outline: none;
    border-color: color-mix(in srgb, var(--accent-primary), var(--surface-border) 40%);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-primary), transparent 78%);
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-select option {
    background: var(--surface-muted);
    color: var(--text-primary);
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-select option:checked,
:is(#testConfigModal, #studySetBuilderModal) .test-config-select option:hover {
    background: color-mix(in srgb, var(--accent-primary), transparent 78%);
    color: var(--text-primary);
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-section {
    margin-top: 18px;
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-options {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-top: 10px;
    margin-bottom: 14px;
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 12px;
    background: var(--surface-base);
    border: 1px solid var(--surface-border);
    cursor: pointer;
    font-size: 13px;
    color: var(--text-primary);
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-option input {
    accent-color: var(--accent-primary);
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-note {
    margin-top: 18px;
    padding: 12px 14px;
    border-radius: 12px;
    background: var(--surface-base);
    border: 1px solid var(--surface-border);
    color: var(--text-secondary);
    font-size: 14px;
}

#studySetBuilderModal #studySetFiles {
    width: 100%;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid var(--surface-border);
    background: var(--surface-base);
    color: var(--text-secondary);
    font-size: 13px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

#studySetBuilderModal #studySetFiles:hover {
    background: var(--surface-hover);
    border-color: color-mix(in srgb, var(--surface-border), var(--text-primary) 14%);
}

#studySetBuilderModal #studySetFiles:focus,
#studySetBuilderModal #studySetFiles:focus-visible {
    outline: none;
    border-color: color-mix(in srgb, var(--accent-primary), var(--surface-border) 40%);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-primary), transparent 78%);
}

#studySetBuilderModal #studySetFiles::file-selector-button {
    margin-right: 10px;
    padding: 7px 10px;
    border-radius: 8px;
    border: 1px solid var(--surface-border);
    background: color-mix(in srgb, var(--accent-primary), transparent 84%);
    color: var(--text-primary);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
}

#studySetBuilderModal #studySetFiles::file-selector-button:hover {
    background: color-mix(in srgb, var(--accent-primary), transparent 74%);
    border-color: color-mix(in srgb, var(--accent-primary), var(--surface-border) 45%);
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding-top: 16px;
    margin-top: 12px;
    border-top: 1px solid var(--surface-border);
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-btn {
    padding: 10px 18px;
    border-radius: 12px;
    border: 1px solid transparent;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease,
        background 0.2s ease;
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-btn.primary {
    background: var(--accent-primary);
    color: var(--text-on-accent);
    box-shadow: 0 10px 24px color-mix(in srgb, var(--accent-primary), transparent 70%);
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-btn.secondary {
    background: var(--surface-base);
    color: var(--text-primary);
    border-color: var(--surface-border);
}

:is(#testConfigModal, #studySetBuilderModal) .test-config-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-elevated);
}

:is(#testConfigModal, #studySetBuilderModal) .modal-box > .modal-body {
    padding-right: 4px;
}

@media (max-width: 600px) {
    :is(#testConfigModal, #studySetBuilderModal) .test-config-grid,
    :is(#testConfigModal, #studySetBuilderModal) .test-config-options {
        grid-template-columns: 1fr;
    }
}

:is(#testConfigModal, #studySetBuilderModal) .modal-box > .modal-body,
:is(#testConfigModal, #studySetBuilderModal) .review-body {
    overflow-y: auto;
    overflow-x: hidden;
    min-height: 0;
}

#testsList.collapsed,
#examsList.collapsed {
    display: none;
}