/* ===== Reset & Base ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-bg:        #f8f9fa;
    --color-surface:   #ffffff;
    --color-text:      #212529;
    --color-muted:     #6c757d;
    --color-primary:   #0d6efd;
    --color-primary-h: #0b5ed7;
    --color-success:   #198754;
    --color-danger:    #dc3545;
    --color-warning-bg:#fff3cd;
    --color-warning-text:#664d03;
    --color-border:    #dee2e6;
    --radius:          0.5rem;
    --max-w:           600px;
    --tap-min:         2.75rem;
}

html {
    font-size: 100%;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100dvh;
}

/* ===== App Shell ===== */
.app-shell {
    width: 100%;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 1rem 0.75rem 2rem;
}

.app-title {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.app-footer {
    text-align: center;
    color: var(--color-muted);
    font-size: 0.75rem;
    margin-top: 2rem;
}

.privacy-note {
    text-align: center;
    color: var(--color-muted);
    font-size: 0.7rem;
    margin-top: 1rem;
    line-height: 1.45;
    padding: 0 0.25rem;
}

/* ===== Upload Form ===== */
.upload-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.form-label {
    font-weight: 600;
    font-size: 0.9rem;
}

/* ---- Drop Zone ---- */
.drop-zone {
    position: relative;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius);
    padding: 1.75rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
}

.drop-zone input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--color-primary);
    background: rgba(13, 110, 253, 0.04);
}

.drop-zone:focus-within {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.drop-zone.has-file {
    border-style: solid;
    border-color: var(--color-success);
    background: rgba(25, 135, 84, 0.04);
}

.drop-zone-icon {
    font-size: 1.75rem;
    color: var(--color-muted);
    line-height: 1;
}

.drop-zone-text {
    font-size: 0.9rem;
}

.drop-zone-hint {
    font-size: 0.72rem;
    color: var(--color-muted);
}

/* ---- File badge (selected filename) ---- */
.file-badge {
    font-size: 0.85rem;
    color: var(--color-success);
    display: none;
    align-items: center;
    gap: 0.5rem;
    word-break: break-word;
    overflow-wrap: break-word;
    line-height: 1.4;
    padding: 0.5rem 0.7rem;
    background: rgba(25, 135, 84, 0.06);
    border: 1px solid rgba(25, 135, 84, 0.2);
    border-radius: var(--radius);
    margin-top: 0.35rem;
}

.file-badge.is-visible {
    display: flex;
}

.file-badge::before {
    content: '\2713';
    font-weight: 700;
    flex-shrink: 0;
    font-size: 1rem;
}

/* ---- Field errors ---- */
.field-error {
    font-size: 0.82rem;
    color: var(--color-danger);
    min-height: 1.3em;
    line-height: 1.4;
}

.field-error:empty {
    min-height: 0;
}

/* ===== Task Options ===== */
.task-group {
    border: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.task-group legend {
    margin-bottom: 0.15rem;
}

.task-option {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.85rem 0.9rem;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    min-height: var(--tap-min);
}

.task-option:hover {
    border-color: var(--color-primary);
}

.task-option:has(input:checked) {
    border-color: var(--color-primary);
    background: rgba(13, 110, 253, 0.05);
}

.task-option:focus-within {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.task-option input[type="checkbox"] {
    width: 1.25rem;
    height: 1.25rem;
    flex-shrink: 0;
    margin-top: 0.1rem;
    accent-color: var(--color-primary);
}

.task-option-body {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
    min-width: 0;
}

.task-option-title {
    font-weight: 600;
    font-size: 0.92rem;
}

.task-option-desc {
    font-size: 0.78rem;
    color: var(--color-muted);
}

/* ===== Alerts ===== */
.alert {
    padding: 0.75rem 0.9rem;
    border-radius: var(--radius);
    font-size: 0.88rem;
    line-height: 1.45;
}

.alert-error {
    background: #f8d7da;
    color: #842029;
    border: 1px solid #f5c2c7;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    font-size: 0.95rem;
    font-weight: 600;
    min-height: var(--tap-min);
    padding: 0.6rem 1rem;
    border: 1px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: background 0.15s, opacity 0.15s;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-full {
    width: 100%;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-h);
}

.btn-primary:active:not(:disabled) {
    transform: scale(0.98);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background: #e9ecef;
}

.btn-ghost {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-border);
}

.btn-ghost:hover:not(:disabled) {
    background: rgba(13, 110, 253, 0.06);
}

/* ---- Loading spinner ---- */
.btn-spinner {
    display: none;
    width: 1.1em;
    height: 1.1em;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    flex-shrink: 0;
}

.btn.is-loading {
    pointer-events: none;
}

.btn.is-loading .btn-spinner {
    display: inline-block;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== Result Page ===== */
.result-header {
    margin-bottom: 0.35rem;
}

.result-meta {
    color: var(--color-muted);
    font-size: 0.85rem;
    margin-bottom: 0.65rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.3rem;
    word-break: break-word;
}

.result-meta strong {
    color: var(--color-text);
}

.result-meta-sep {
    opacity: 0.4;
}

.result-meta-text {
    color: var(--color-muted);
    font-size: 0.78rem;
    margin-bottom: 0.4rem;
}

.result-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1rem 0.9rem;
    margin-bottom: 0.75rem;
}

.result-card h2 {
    font-size: 1.05rem;
    margin-bottom: 0.6rem;
}

.result-content {
    white-space: pre-wrap;
    word-break: break-word;
    line-height: 1.65;
    font-size: 0.9rem;
}

.result-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.6rem;
    margin-bottom: 0.4rem;
}

.result-card-header h2 {
    margin-bottom: 0;
}

.status-badge {
    display: inline-block;
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.15em 0.5em;
    border-radius: 99px;
    vertical-align: middle;
    flex-shrink: 0;
}

.status-uploaded    { background: #e9ecef; color: #495057; }
.status-text_extracted { background: #cff4fc; color: #055160; }
.status-analyzed    { background: #d1e7dd; color: #0a3622; }
.status-failed      { background: #f8d7da; color: #842029; }

.result-card-error {
    border-color: #f5c2c7;
    background: #fff5f5;
}

.result-card-warning {
    border-color: #ffe69c;
    background: #fffdf5;
}

.result-card-info {
    border-color: rgba(13, 110, 253, 0.2);
    background: rgba(13, 110, 253, 0.03);
}

.result-card-warning-inline {
    background: #fff8e1;
    border-left: 3px solid #ffc107;
    padding: 0.6rem 0.8rem;
    margin-bottom: 0.6rem;
    border-radius: 0 var(--radius) var(--radius) 0;
    font-size: 0.85rem;
    word-break: break-word;
}

/* ---- Result Items ---- */
.result-list {
    padding-left: 1.15rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.result-item {
    line-height: 1.6;
}

.result-item-question,
.result-item-issue {
    margin-bottom: 0.35rem;
}

.result-item-issue .confidence {
    display: inline-block;
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    padding: 0.1em 0.4em;
    border-radius: 99px;
    margin-right: 0.4rem;
    vertical-align: middle;
    flex-shrink: 0;
}

.confidence-high   { background: #d1e7dd; color: #0a3622; }
.confidence-medium { background: #fff3cd; color: #664d03; }
.confidence-low    { background: #f8d7da; color: #842029; }

.result-item-details {
    display: block;
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

.result-item-details dt {
    font-weight: 600;
    color: var(--color-muted);
    font-size: 0.78rem;
    margin-top: 0.5rem;
    margin-bottom: 0.15rem;
}

.result-item-details dt:first-child {
    margin-top: 0;
}

.result-item-details dd {
    margin: 0 0 0.35rem 0;
    word-break: break-word;
}

.result-item-details q {
    font-style: italic;
    color: var(--color-muted);
}

.text-preview {
    margin-top: 0.4rem;
}

.text-preview summary {
    cursor: pointer;
    font-size: 0.82rem;
    color: var(--color-primary);
    font-weight: 500;
    min-height: var(--tap-min);
    display: flex;
    align-items: center;
}

.result-card-empty {
    text-align: center;
    padding: 1.75rem 1rem;
    color: var(--color-muted);
}

.result-card-empty h2 {
    color: var(--color-text);
}

/* ---- Question Groups ---- */
.question-group {
    margin-bottom: 0.6rem;
}

.question-group-title {
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-muted);
    margin-bottom: 0.4rem;
    padding-bottom: 0.35rem;
    border-bottom: 1px solid var(--color-border);
}

.question-group-count {
    display: inline-block;
    font-size: 0.68rem;
    background: var(--color-border);
    color: var(--color-muted);
    padding: 0.05em 0.45em;
    border-radius: 99px;
    vertical-align: middle;
}

/* ---- Accordion ---- */
.accordion {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    margin-bottom: 0.4rem;
    overflow: hidden;
}

.accordion[open] {
    border-color: var(--color-primary);
}

.accordion-summary {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.4rem;
    padding: 0.7rem 0.75rem;
    cursor: pointer;
    list-style: none;
    user-select: none;
    min-height: var(--tap-min);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.accordion-summary::-webkit-details-marker {
    display: none;
}

.accordion-summary::before {
    content: '\25B6';
    display: inline-block;
    font-size: 0.55rem;
    margin-right: 0.4rem;
    margin-top: 0.35rem;
    flex-shrink: 0;
    transition: transform 0.15s;
    color: var(--color-muted);
}

.accordion[open] > .accordion-summary::before {
    transform: rotate(90deg);
}

.accordion-text {
    flex: 1;
    min-width: 0;
    font-size: 0.9rem;
    line-height: 1.5;
    word-break: break-word;
}

.accordion-actions {
    flex-shrink: 0;
    display: flex;
    gap: 0.2rem;
    align-items: center;
}

/* ---- Copy Buttons ---- */
.btn-sm {
    font-size: 0.8rem;
    padding: 0.4rem 0.7rem;
    min-height: auto;
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: var(--tap-min);
    height: var(--tap-min);
    padding: 0;
    border: 1px solid transparent;
    border-radius: var(--radius);
    background: transparent;
    color: var(--color-muted);
    cursor: pointer;
    transition: color 0.15s, background 0.15s, border-color 0.15s;
    flex-shrink: 0;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    min-height: var(--tap-min);
}

.btn-icon:hover {
    color: var(--color-primary);
    background: rgba(13, 110, 253, 0.06);
    border-color: var(--color-border);
}

.btn-icon:active {
    background: rgba(13, 110, 253, 0.12);
}

.copy-all-btn {
    white-space: nowrap;
    flex-shrink: 0;
    font-size: 0.8rem;
    padding: 0.35rem 0.7rem;
    min-height: auto;
}

.copy-all-btn.btn-copied {
    background: #d1e7dd;
    color: #0a3622;
    border-color: #b7dfc9;
}

.copy-btn.btn-copied {
    color: var(--color-success);
    background: rgba(25, 135, 84, 0.08);
    border-color: rgba(25, 135, 84, 0.3);
}

/* ---- Export Bar ---- */
.export-bar {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 1.25rem;
    padding: 0.85rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.export-bar .btn {
    width: 100%;
    white-space: normal;
}

.copy-full-btn.btn-copied,
.download-btn.btn-downloaded {
    background: #d1e7dd;
    color: #0a3622;
    border-color: #b7dfc9;
}

.result-back {
    margin-top: 1.25rem;
    text-align: center;
}

.result-back .btn {
    min-width: 0;
    width: 100%;
}

/* ===== Add More Questions ===== */
.add-questions-card {
    margin-top: 1rem;
}

.add-questions-card h2 {
    margin-bottom: 0.2rem;
}

.add-questions-hint {
    font-size: 0.8rem;
    color: var(--color-muted);
    margin-bottom: 0.65rem;
}

.add-questions-controls {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.6rem;
}

@media (min-width: 400px) {
    .add-questions-controls {
        flex-direction: row;
    }
}

.add-questions-field {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    flex: 1 1 0;
    min-width: 0;
}

.add-questions-label {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-muted);
}

.add-questions-select {
    width: 100%;
    min-height: var(--tap-min);
    padding: 0.45rem 0.65rem;
    font-family: inherit;
    font-size: 0.9rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' stroke='%236c757d' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.65rem center;
    padding-right: 2rem;
}

.add-questions-select:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.add-questions-btn {
    width: 100%;
}

.add-questions-btn.is-loading {
    pointer-events: none;


/* ===== Practice Mode ===== */
.practice-section {
    border-color: var(--color-primary);
    border-left: 3px solid var(--color-primary);
}

.practice-section-hint {
    font-size: 0.78rem;
    color: var(--color-muted);
    display: block;
    margin-top: -0.3rem;
}

/* ---- Practice summary card ---- */
.practice-summary {
    margin-bottom: 0.75rem;
    padding: 0.65rem 0.75rem;
    background: rgba(13, 110, 253, 0.03);
    border: 1px solid rgba(13, 110, 253, 0.1);
    border-radius: var(--radius);
}

.practice-summary-title {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.4rem;
}

.practice-summary-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.4rem;
}

.practice-summary-grid-scores {
    margin-bottom: 0.35rem;
}

.practice-summary-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.1rem;
    flex: 1 1 auto;
    min-width: 3.5rem;
    padding: 0.35rem 0.4rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.practice-summary-stat-attention {
    border-color: rgba(255, 193, 7, 0.4);
    background: rgba(255, 193, 7, 0.04);
}

.practice-summary-stat-attention .practice-summary-value {
    color: #856404;
}

.practice-summary-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1.2;
}

.practice-summary-score {
    color: var(--color-text);
}

.practice-summary-label {
    font-size: 0.62rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-muted);
    text-align: center;
    line-height: 1.3;
}

.practice-summary-note {
    font-size: 0.78rem;
    padding: 0.3rem 0.55rem;
    border-radius: var(--radius);
    margin-bottom: 0.35rem;
    line-height: 1.45;
}

.practice-summary-note-warn {
    background: rgba(220, 53, 69, 0.06);
    color: #842029;
}

.practice-summary-retry {
    margin-top: 0.35rem;
}

.practice-summary-retry-title {
    display: block;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-muted);
    margin-bottom: 0.3rem;
}

.practice-summary-retry-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.practice-summary-retry-link {
    display: block;
    font-size: 0.82rem;
    color: var(--color-primary);
    text-decoration: none;
    padding: 0.3rem 0.5rem;
    border-radius: var(--radius);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    min-height: var(--tap-min);
    display: flex;
    align-items: center;
    word-break: break-word;
    line-height: 1.4;
    transition: background 0.15s, border-color 0.15s;
}

.practice-summary-retry-link:hover {
    background: rgba(13, 110, 253, 0.04);
    border-color: var(--color-primary);
}

.practice-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.85rem;
    margin-bottom: 0.65rem;
    background: var(--color-surface);
}

.practice-card[hidden] {
    display: none;
}

.practice-card:last-child {
    margin-bottom: 0;
}

.practice-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    gap: 0.5rem;
}

.practice-category {
    display: inline-block;
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-primary);
    background: rgba(13, 110, 253, 0.08);
    padding: 0.15em 0.55em;
    border-radius: 99px;
}

.practice-qnum {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--color-muted);
    flex-shrink: 0;
    margin-left: auto;
}

.practice-focus-badge {
    font-size: 0.62rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    background: rgba(13, 110, 253, 0.07);
    color: var(--color-primary);
    padding: 0.15em 0.5em;
    border-radius: 99px;
    flex-shrink: 0;
}

/* ---- Focus filters ---- */
.practice-filters {
    margin-bottom: 0.5rem;
}

.practice-filters-label {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-muted);
    margin-bottom: 0.3rem;
    display: block;
}

.practice-filters-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
}

.practice-filter-btn {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 0.25rem 0.6rem;
    border: 1px solid var(--color-border);
    border-radius: 99px;
    background: var(--color-surface);
    color: var(--color-muted);
    cursor: pointer;
    min-height: 2rem;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    white-space: nowrap;
}

.practice-filter-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.practice-filter-btn.is-active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.practice-question {
    font-size: 0.92rem;
    font-weight: 600;
    line-height: 1.55;
    margin-bottom: 0.5rem;
    word-break: break-word;
}

.practice-reference {
    margin: 0 0 0.5rem 0;
    padding: 0.45rem 0.65rem;
    background: rgba(0, 0, 0, 0.03);
    border-left: 3px solid var(--color-border);
    border-radius: 0 4px 4px 0;
    font-size: 0.82rem;
    font-style: italic;
    color: var(--color-muted);
    word-break: break-word;
    line-height: 1.5;
}

.practice-reference-label {
    font-size: 0.68rem;
    font-weight: 600;
    font-style: normal;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-muted);
    display: block;
    margin-bottom: 0.15rem;
}

.practice-toggle-direction {
    margin-bottom: 0.45rem;
    font-size: 0.8rem;
    padding: 0.35rem 0.65rem;
    min-height: var(--tap-min);
    width: 100%;
    text-align: left;
}

.practice-toggle-direction[aria-expanded="true"] {
    background: rgba(13, 110, 253, 0.06);
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.practice-direction {
    margin-bottom: 0.65rem;
    padding: 0.65rem 0.75rem;
    background: rgba(13, 110, 253, 0.03);
    border: 1px solid rgba(13, 110, 253, 0.15);
    border-radius: var(--radius);
    font-size: 0.85rem;
    line-height: 1.55;
}

.practice-direction-text {
    margin-bottom: 0.35rem;
}

.practice-direction-context {
    font-size: 0.8rem;
    color: var(--color-muted);
    margin-top: 0.35rem;
    padding-top: 0.35rem;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.practice-direction-context strong {
    color: var(--color-text);
}

/* ---- Practice progress indicator ---- */
.practice-progress {
    margin: 0.5rem 0 0.65rem 0;
    padding: 0.55rem 0.65rem;
    background: rgba(13, 110, 253, 0.04);
    border: 1px solid rgba(13, 110, 253, 0.1);
    border-radius: var(--radius);
}

.practice-progress-items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.practice-progress-item {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.8rem;
}

.practice-progress-label {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-muted);
}

.practice-progress-value {
    font-weight: 700;
    color: var(--color-primary);
    background: var(--color-surface);
    padding: 0.1em 0.5em;
    border-radius: 99px;
    border: 1px solid var(--color-border);
    font-size: 0.82rem;
}

.practice-trend {
    margin-top: 0.4rem;
    font-size: 0.78rem;
    padding: 0.3rem 0.55rem;
    border-radius: var(--radius);
    line-height: 1.45;
}

.practice-trend-first {
    background: rgba(13, 110, 253, 0.06);
    color: #0a58ca;
}

.practice-trend-up {
    background: rgba(25, 135, 84, 0.07);
    color: #0a3622;
}

.practice-trend-neutral {
    background: rgba(0, 0, 0, 0.04);
    color: var(--color-muted);
}

.practice-answer-area {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.35rem;
}

.practice-answer-label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-muted);
}

.practice-textarea {
    width: 100%;
    min-height: 5rem;
    padding: 0.65rem 0.75rem;
    font-family: inherit;
    font-size: 0.9rem;
    line-height: 1.6;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    resize: vertical;
    background: var(--color-surface);
    color: var(--color-text);
    transition: border-color 0.15s;
    -webkit-appearance: none;
}

.practice-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.12);
}

.practice-textarea::placeholder {
    color: #adb5bd;
}

.practice-grade-btn {
    align-self: flex-start;
}

.practice-grade-btn.is-grading {
    pointer-events: none;
    opacity: 0.7;
}

/* ---- Practice Feedback ---- */
.practice-feedback {
    margin-top: 0.5rem;
    padding: 0.65rem 0.75rem;
    border-radius: var(--radius);
    font-size: 0.85rem;
    line-height: 1.55;
}

.practice-feedback-success {
    background: rgba(25, 135, 84, 0.06);
    border: 1px solid rgba(25, 135, 84, 0.2);
}

.practice-feedback-error {
    background: rgba(220, 53, 69, 0.06);
    border: 1px solid rgba(220, 53, 69, 0.2);
    color: var(--color-danger);
}

.practice-feedback-grade {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 0.3rem;
}

.practice-feedback-grade.excellent       { color: #0d6efd; }
.practice-feedback-grade.good            { color: #198754; }
.practice-feedback-grade.needs_improvement { color: #fd7e14; }
.practice-feedback-grade.incorrect       { color: #dc3545; }

.practice-feedback-text {
    margin-bottom: 0.4rem;
}

.practice-feedback-scores {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-bottom: 0.4rem;
}

.practice-feedback-scores .practice-score-item {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.78rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.2rem 0.5rem;
}

.practice-feedback-scores .practice-score-label {
    color: var(--color-muted);
}

.practice-feedback-scores .practice-score-value {
    font-weight: 700;
}

.practice-feedback-unsupported,
.practice-feedback-improvements {
    margin-top: 0.4rem;
    font-size: 0.82rem;
}

.practice-feedback-unsupported strong,
.practice-feedback-improvements strong {
    display: block;
    margin-bottom: 0.15rem;
}

.practice-feedback-unsupported ul,
.practice-feedback-improvements ul {
    margin: 0;
    padding-left: 1.15rem;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.practice-feedback-unsupported li,
.practice-feedback-improvements li {
    word-break: break-word;
}

/* ---- Previous Attempts ---- */
.practice-attempts {
    margin-top: 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.practice-attempts[open] {
    border-color: var(--color-muted);
}

.practice-attempts-summary {
    padding: 0.5rem 0.7rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-muted);
    cursor: pointer;
    min-height: var(--tap-min);
    display: flex;
    align-items: center;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.practice-attempts-summary::-webkit-details-marker {
    display: none;
}

.practice-attempts-summary::before {
    content: '\25B6';
    display: inline-block;
    font-size: 0.5rem;
    margin-right: 0.45rem;
    transition: transform 0.15s;
    color: var(--color-muted);
}

.practice-attempts[open] > .practice-attempts-summary::before {
    transform: rotate(90deg);
}

.practice-attempt-accordion {
    border-top: 1px solid var(--color-border);
    font-size: 0.82rem;
}

.practice-attempt-accordion[open] {
    background: rgba(0, 0, 0, 0.012);
}

.practice-attempt-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem 0.7rem;
    cursor: pointer;
    list-style: none;
    user-select: none;
    min-height: var(--tap-min);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.practice-attempt-header::-webkit-details-marker {
    display: none;
}

.practice-attempt-header::before {
    content: '\25B6';
    display: inline-block;
    font-size: 0.45rem;
    margin-right: 0.4rem;
    flex-shrink: 0;
    transition: transform 0.15s;
    color: var(--color-muted);
}

.practice-attempt-accordion[open] > .practice-attempt-header::before {
    transform: rotate(90deg);
}

.practice-attempt-num {
    font-weight: 700;
    font-size: 0.8rem;
}

.practice-score {
    font-size: 0.78rem;
    background: rgba(13, 110, 253, 0.08);
    color: var(--color-primary);
    padding: 0.1em 0.5em;
    border-radius: 99px;
    font-weight: 600;
}

.practice-attempt-status {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.15em 0.5em;
    border-radius: 99px;
    margin-left: auto;
}

.practice-attempt-status.status-submitted { background: #e9ecef; color: #495057; }
.practice-attempt-status.status-graded    { background: #d1e7dd; color: #0a3622; }
.practice-attempt-status.status-failed    { background: #f8d7da; color: #842029; }

.practice-attempt-body {
    padding: 0 0.7rem 0.65rem 0.7rem;
}

.practice-attempt-error {
    margin-bottom: 0.5rem;
    padding: 0.5rem 0.65rem;
    background: rgba(220, 53, 69, 0.05);
    border: 1px solid rgba(220, 53, 69, 0.15);
    border-radius: var(--radius);
    font-size: 0.8rem;
    color: var(--color-danger);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
}

.practice-attempt-error p {
    flex: 1 1 200px;
    min-width: 0;
    word-break: break-word;
    line-height: 1.45;
}

.practice-retry-btn {
    flex-shrink: 0;
}

.practice-attempt-answer {
    margin-bottom: 0.5rem;
}

.practice-attempt-answer strong {
    display: block;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-muted);
    margin-bottom: 0.1rem;
}

.practice-attempt-answer p {
    white-space: pre-wrap;
    word-break: break-word;
    line-height: 1.5;
    font-size: 0.85rem;
}

.practice-attempt-scores {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
    margin-bottom: 0.35rem;
}

.practice-score-item {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.72rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.15rem 0.45rem;
}

.practice-score-label {
    color: var(--color-muted);
}

.practice-score-value {
    font-weight: 700;
    color: var(--color-text);
}

/* ---- Feedback blocks inside attempts ---- */
.practice-fb-block {
    margin-top: 0.3rem;
    padding: 0.35rem 0.5rem;
    border-radius: var(--radius);
    font-size: 0.82rem;
}

.practice-fb-block strong {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-muted);
    margin-bottom: 0.15rem;
}

.practice-fb-block ul {
    margin: 0.1rem 0 0 0;
    padding-left: 1.1rem;
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.practice-fb-block li {
    word-break: break-word;
    line-height: 1.45;
}

.practice-fb-block p {
    white-space: pre-wrap;
    word-break: break-word;
    line-height: 1.5;
    margin: 0;
}

.practice-fb-reason {
    background: rgba(220, 53, 69, 0.05);
    border: 1px solid rgba(220, 53, 69, 0.12);
}

.practice-fb-strengths {
    background: rgba(25, 135, 84, 0.05);
    border: 1px solid rgba(25, 135, 84, 0.12);
}

.practice-fb-strengths strong {
    color: #198754;
}

.practice-fb-missing {
    background: rgba(255, 193, 7, 0.06);
    border: 1px solid rgba(255, 193, 7, 0.15);
}

.practice-fb-unsupported {
    background: rgba(220, 53, 69, 0.06);
    border: 1px solid rgba(220, 53, 69, 0.15);
}

.practice-fb-unsupported strong {
    color: var(--color-danger);
}

.practice-fb-unsupported li {
    color: #842029;
}

.practice-fb-suggestions {
    background: rgba(13, 110, 253, 0.04);
    border: 1px solid rgba(13, 110, 253, 0.1);
}

.practice-fb-revision {
    background: rgba(13, 110, 253, 0.03);
    border: 1px solid rgba(13, 110, 253, 0.08);
}

.practice-fb-revision p {
    font-style: italic;
}

.practice-fb-references {
    background: rgba(0, 0, 0, 0.025);
    border: 1px solid var(--color-border);
}

.practice-confidence {
    font-size: 0.72rem;
    color: var(--color-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-top: 0.35rem;
}

/* ===== Mobile-first responsive ===== */
@media (min-width: 400px) {
    .export-bar {
        flex-direction: row;
    }

    .export-bar .btn {
        flex: 1 1 0;
        width: auto;
    }

    .result-back .btn {
        width: auto;
    }
}

@media (min-width: 480px) {
    .app-shell {
        padding: 1.5rem 1rem 2rem;
    }

    .app-title {
        font-size: 1.6rem;
    }

    .drop-zone {
        padding: 2.25rem 1.75rem;
    }

    .task-option {
        padding: 0.85rem 1rem;
    }

    .result-card {
        padding: 1.15rem 1.1rem;
    }
}

@media (min-width: 768px) {
    .app-shell {
        padding: 2.5rem 1rem 2.5rem;
    }

    .app-title {
        font-size: 1.8rem;
        margin-bottom: 1.25rem;
    }
}