/* Image to Math — shared modal for all math calculator tools */

.itm-overlay {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99999;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.itm-modal {
    background: var(--bg-primary, #fff);
    border-radius: 0.75rem;
    width: 100%;
    max-width: 540px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

/* Header */
.itm-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 0.875rem 1.25rem;
    border-bottom: 1px solid var(--border, #e2e8f0);
}
.itm-title { font-weight: 700; font-size: 0.9375rem; color: var(--text-primary, #0f172a); }
.itm-close {
    background: none; border: none; font-size: 1.5rem; line-height: 1;
    color: var(--text-muted, #94a3b8); cursor: pointer;
}
.itm-close:hover { color: var(--text-primary, #0f172a); }

/* Body */
.itm-body { padding: 1.25rem; }

/* Drop zone */
.itm-dropzone {
    border: 2px dashed var(--border, #cbd5e1);
    border-radius: 0.5rem; padding: 2rem 1rem;
    text-align: center; cursor: pointer; transition: all 0.15s;
    background: var(--bg-secondary, #f8fafc);
}
.itm-dropzone:hover, .itm-dropzone.dragover {
    border-color: var(--primary, #6366f1);
    background: rgba(99, 102, 241, 0.04);
}
.itm-dropzone-icon { font-size: 2.5rem; margin-bottom: 0.5rem; }
.itm-dropzone-text { color: var(--text-secondary, #475569); font-size: 0.875rem; }
.itm-browse { color: var(--primary, #6366f1); cursor: pointer; font-weight: 600; text-decoration: underline; }
.itm-dropzone-hint { color: var(--text-muted, #94a3b8); font-size: 0.75rem; margin-top: 0.375rem; }

/* File input hidden */
.itm-file-input { position: absolute; width: 0; height: 0; opacity: 0; }

/* PDF page picker */
.itm-pdf-header {
    font-size: 0.875rem; font-weight: 600; color: var(--text-primary, #0f172a);
    margin-bottom: 0.75rem;
}
.itm-pdf-pages {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 0.625rem; max-height: 320px; overflow-y: auto;
    padding: 0.25rem;
}
.itm-pdf-page {
    border: 2px solid var(--border, #e2e8f0); border-radius: 0.5rem;
    cursor: pointer; text-align: center; padding: 0.375rem;
    transition: all 0.12s; background: var(--bg-primary, #fff);
}
.itm-pdf-page:hover { border-color: var(--primary, #6366f1); }
.itm-pdf-page.selected {
    border-color: var(--primary, #6366f1);
    background: rgba(99, 102, 241, 0.04);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}
.itm-pdf-thumb {
    width: 100%; height: auto; border-radius: 0.25rem;
    border: 1px solid var(--border, #e2e8f0); background: #fff;
}
.itm-pdf-page-num {
    font-size: 0.6875rem; color: var(--text-secondary, #475569);
    margin-top: 0.25rem; font-weight: 500;
}
.itm-pdf-actions {
    display: flex; gap: 0.5rem; margin-top: 0.875rem; flex-wrap: wrap;
}

/* URL input row */
.itm-url-row { margin-top: 0.75rem; }
.itm-url-divider {
    text-align: center; font-size: 0.6875rem; color: var(--text-muted, #94a3b8);
    margin-bottom: 0.5rem; position: relative;
}
.itm-url-divider span {
    background: var(--bg-primary, #fff); padding: 0 0.75rem; position: relative; z-index: 1;
}
.itm-url-divider::before {
    content: ''; position: absolute; left: 0; right: 0; top: 50%;
    border-top: 1px solid var(--border, #e2e8f0);
}
.itm-url-input-row { display: flex; gap: 0.375rem; }
.itm-url-input {
    flex: 1; padding: 0.4rem 0.625rem;
    border: 1px solid var(--border, #cbd5e1); border-radius: 0.375rem;
    font-size: 0.75rem; color: var(--text-primary, #0f172a);
    background: var(--bg-primary, #fff); outline: none;
}
.itm-url-input:focus { border-color: var(--primary, #6366f1); }
.itm-url-input::placeholder { color: var(--text-muted, #94a3b8); }
.itm-url-input:disabled { opacity: 0.5; }
.itm-url-btn {
    padding: 0.4rem 0.75rem; background: var(--bg-tertiary, #f1f5f9);
    color: var(--text-secondary, #475569); border: 1px solid var(--border, #cbd5e1);
    border-radius: 0.375rem; font-size: 0.75rem; font-weight: 500;
    cursor: pointer; white-space: nowrap;
}
.itm-url-btn:hover { background: var(--border, #e2e8f0); color: var(--text-primary, #0f172a); }
.itm-url-btn:disabled { opacity: 0.5; cursor: default; }

[data-theme="dark"] .itm-url-input { background: #0f172a; border-color: #334155; color: #e2e8f0; }
[data-theme="dark"] .itm-url-divider span { background: var(--bg-primary, #1e293b); }
[data-theme="dark"] .itm-url-divider::before { border-top-color: rgba(255,255,255,0.06); }
[data-theme="dark"] .itm-url-btn { background: #334155; color: #cbd5e1; border-color: #475569; }
[data-theme="dark"] .itm-url-btn:hover { background: #475569; color: #fff; }

/* Preview */
.itm-preview {
    display: flex; align-items: center; gap: 0.75rem;
    padding: 0.625rem; background: var(--bg-secondary, #f8fafc);
    border: 1px solid var(--border, #e2e8f0); border-radius: 0.5rem;
    position: relative; margin-top: 0.75rem;
}
.itm-preview img {
    max-width: 120px; max-height: 80px; border-radius: 0.375rem;
    border: 1px solid var(--border, #e2e8f0); object-fit: contain; background: #fff;
}
.itm-preview-info { font-size: 0.75rem; color: var(--text-secondary, #475569); }
.itm-remove {
    position: absolute; top: 6px; right: 6px;
    background: #ef4444; color: #fff; border: none;
    border-radius: 50%; width: 22px; height: 22px; font-size: 0.8rem;
    cursor: pointer; display: flex; align-items: center; justify-content: center;
}

/* Error */
.itm-error {
    padding: 0.5rem 0.75rem; background: rgba(239, 68, 68, 0.08);
    color: #dc2626; border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 0.375rem; font-size: 0.8125rem; margin-top: 0.75rem;
}

/* Scan button */
.itm-scan-btn {
    margin-top: 0.75rem; padding: 0.625rem 1.5rem;
    background: var(--primary, #6366f1); color: #fff;
    border: none; border-radius: 0.5rem; font-size: 0.875rem; font-weight: 600;
    cursor: pointer; transition: all 0.12s;
}
.itm-scan-btn:hover:not(:disabled) { filter: brightness(1.1); }
.itm-scan-btn:disabled { opacity: 0.4; cursor: default; }

/* Processing */
.itm-processing {
    text-align: center; padding: 2rem 1rem;
}
.itm-spinner {
    width: 36px; height: 36px; margin: 0 auto 1rem;
    border: 3px solid var(--border, #e2e8f0);
    border-top-color: var(--primary, #6366f1);
    border-radius: 50%;
    animation: itm-spin 0.7s linear infinite;
}
@keyframes itm-spin { to { transform: rotate(360deg); } }
.itm-processing-text {
    font-size: 0.875rem; color: var(--text-secondary, #475569); font-weight: 500;
}
.itm-quote {
    margin-top: 1.5rem; padding: 1rem 1.25rem;
    background: var(--bg-secondary, #f8fafc);
    border-radius: 0.5rem; border-left: 3px solid var(--primary, #6366f1);
    animation: itm-quote-in 0.4s ease;
}
@keyframes itm-quote-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
.itm-quote-text {
    font-size: 0.8125rem; color: var(--text-primary, #0f172a);
    line-height: 1.5; font-style: italic;
}
.itm-quote-author {
    font-size: 0.6875rem; color: var(--text-muted, #94a3b8);
    margin-top: 0.375rem; font-weight: 500;
}

[data-theme="dark"] .itm-quote { background: rgba(255,255,255,0.03); }
[data-theme="dark"] .itm-quote-text { color: #e2e8f0; }

/* Problem picker */
.itm-pick-header {
    font-size: 0.875rem; font-weight: 600; color: var(--text-primary, #0f172a);
    margin-bottom: 0.75rem;
}
.itm-pick-list {
    display: flex; flex-direction: column; gap: 0.5rem;
    max-height: 300px; overflow-y: auto;
}
.itm-problem {
    display: flex; align-items: flex-start; gap: 0.625rem;
    padding: 0.625rem 0.75rem;
    border: 1px solid var(--border, #e2e8f0);
    border-radius: 0.5rem; cursor: pointer;
    transition: all 0.12s;
    background: var(--bg-primary, #fff);
}
.itm-problem:hover { border-color: var(--primary, #6366f1); background: rgba(99, 102, 241, 0.03); }
.itm-problem.selected { border-color: var(--primary, #6366f1); background: rgba(99, 102, 241, 0.06); }
.itm-problem-check { padding-top: 2px; }
.itm-problem-cb { accent-color: var(--primary, #6366f1); width: 16px; height: 16px; cursor: pointer; }
.itm-problem-content { flex: 1; min-width: 0; }
.itm-problem-display {
    font-size: 1rem; color: var(--text-primary, #0f172a); line-height: 1.5;
    overflow-x: auto;
}
.itm-problem-meta {
    font-size: 0.6875rem; color: var(--text-muted, #94a3b8); margin-top: 2px;
}
.itm-problem-expr {
    margin-top: 3px;
}
.itm-problem-expr code {
    font-family: 'JetBrains Mono', monospace; font-size: 0.75rem;
    background: var(--bg-tertiary, #f1f5f9); padding: 2px 6px; border-radius: 3px;
    color: var(--text-secondary, #475569);
}

/* Picker actions */
.itm-pick-actions {
    display: flex; gap: 0.5rem; margin-top: 0.875rem; flex-wrap: wrap;
}
.itm-btn-primary, .itm-btn {
    padding: 0.5rem 1rem; border-radius: 0.375rem; font-size: 0.8125rem;
    font-weight: 600; cursor: pointer; transition: all 0.12s; border: none;
}
.itm-btn-primary { background: var(--primary, #6366f1); color: #fff; }
.itm-btn-primary:hover:not(:disabled) { filter: brightness(1.1); }
.itm-btn-primary:disabled { opacity: 0.4; cursor: default; }
.itm-btn { background: var(--bg-tertiary, #f1f5f9); color: var(--text-secondary, #475569); }
.itm-btn:hover { background: var(--border, #e2e8f0); color: var(--text-primary, #0f172a); }

/* Select-all row */
.itm-select-all {
    display: flex; align-items: center; gap: 0.5rem;
    padding: 0.375rem 0.75rem; margin-bottom: 0.5rem;
    font-size: 0.8125rem; color: var(--text-secondary, #475569);
    cursor: pointer; user-select: none;
}
.itm-select-all input { accent-color: var(--primary, #6366f1); width: 15px; height: 15px; cursor: pointer; }

/* ── Batch Results Modal ── */
.itm-results-overlay {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(0, 0, 0, 0.55);
    z-index: 100000;
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding: 2rem 1rem;
    overflow-y: auto;
}
.itm-results-modal {
    background: var(--bg-primary, #fff);
    border-radius: 0.75rem;
    width: 100%; max-width: 700px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    margin: 1rem auto;
}
.itm-results-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 0.875rem 1.25rem;
    border-bottom: 1px solid var(--border, #e2e8f0);
}
.itm-results-title { font-weight: 700; font-size: 0.9375rem; color: var(--text-primary, #0f172a); }
.itm-results-body { padding: 1.25rem; }

/* Individual result card */
.itm-result-card {
    border: 1px solid var(--border, #e2e8f0);
    border-radius: 0.5rem;
    margin-bottom: 0.75rem;
    overflow: hidden;
    transition: border-color 0.15s;
}
.itm-result-card.solving { border-color: var(--primary, #6366f1); }
.itm-result-card.solved { border-color: #22c55e; }
.itm-result-card.error { border-color: #ef4444; }

.itm-result-card-header {
    display: flex; align-items: center; gap: 0.625rem;
    padding: 0.625rem 0.875rem;
    background: var(--bg-secondary, #f8fafc);
    border-bottom: 1px solid var(--border, #e2e8f0);
    font-size: 0.8125rem;
}
.itm-result-num {
    background: var(--primary, #6366f1); color: #fff;
    width: 22px; height: 22px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.6875rem; font-weight: 700; flex-shrink: 0;
}
.itm-result-problem { flex: 1; min-width: 0; overflow-x: auto; }
.itm-result-status {
    font-size: 0.6875rem; font-weight: 600; padding: 2px 8px;
    border-radius: 10px; white-space: nowrap;
}
.itm-result-status.pending { background: var(--bg-tertiary, #f1f5f9); color: var(--text-muted, #94a3b8); }
.itm-result-status.solving { background: rgba(99,102,241,0.1); color: var(--primary, #6366f1); }
.itm-result-status.done { background: rgba(34,197,94,0.1); color: #16a34a; }
.itm-result-status.fail { background: rgba(239,68,68,0.08); color: #dc2626; }

.itm-result-card-body {
    padding: 0.75rem 0.875rem;
    min-height: 2.5rem;
}
.itm-result-card-body .itm-spinner {
    width: 20px; height: 20px; margin: 0.5rem auto;
}

/* Result answer display */
.itm-result-integral { font-size: 0.9rem; margin-bottom: 0.375rem; }
.itm-result-answer { font-size: 1.05rem; font-weight: 500; }
.itm-result-method {
    display: inline-block; margin-top: 0.375rem;
    font-size: 0.6875rem; padding: 2px 8px;
    background: var(--bg-tertiary, #f1f5f9); color: var(--text-secondary, #475569);
    border-radius: 10px;
}
.itm-result-error-msg {
    color: #dc2626; font-size: 0.8125rem;
}

/* Steps toggle inside result card */
.itm-result-steps-btn {
    background: none; border: none; color: var(--primary, #6366f1);
    font-size: 0.75rem; font-weight: 600; cursor: pointer;
    padding: 0.25rem 0; margin-top: 0.375rem;
}
.itm-result-steps-btn:hover { text-decoration: underline; }
.itm-result-steps-area {
    display: none; margin-top: 0.5rem; padding: 0.625rem;
    background: var(--bg-secondary, #f8fafc);
    border-radius: 0.375rem; font-size: 0.8125rem;
    overflow-x: auto;
}
.itm-result-steps-area.open { display: block; }
.itm-result-step { margin-bottom: 0.5rem; }
.itm-result-step-title {
    font-size: 0.6875rem; font-weight: 600;
    color: var(--text-muted, #94a3b8);
    margin-bottom: 2px;
}

/* Footer */
.itm-results-footer {
    display: flex; gap: 0.5rem; justify-content: flex-end;
    padding: 0.75rem 1.25rem;
    border-top: 1px solid var(--border, #e2e8f0);
}

/* ── Dark mode ── */
[data-theme="dark"] .itm-modal { background: var(--bg-primary, #1e293b); }
[data-theme="dark"] .itm-header { border-bottom-color: rgba(255,255,255,0.06); }
[data-theme="dark"] .itm-title { color: #f1f5f9; }
[data-theme="dark"] .itm-dropzone { border-color: #334155; background: #0f172a; }
[data-theme="dark"] .itm-dropzone:hover, [data-theme="dark"] .itm-dropzone.dragover { border-color: #6366f1; background: rgba(99,102,241,0.08); }
[data-theme="dark"] .itm-preview { background: #0f172a; border-color: #334155; }
[data-theme="dark"] .itm-problem { background: #0f172a; border-color: #334155; }
[data-theme="dark"] .itm-problem:hover { border-color: #6366f1; background: rgba(99,102,241,0.06); }
[data-theme="dark"] .itm-problem.selected { background: rgba(99,102,241,0.1); }
[data-theme="dark"] .itm-problem-display { color: #f1f5f9; }
[data-theme="dark"] .itm-problem-expr code { background: #334155; color: #cbd5e1; }
[data-theme="dark"] .itm-btn { background: #334155; color: #cbd5e1; }
[data-theme="dark"] .itm-btn:hover { background: #475569; color: #fff; }

[data-theme="dark"] .itm-results-modal { background: var(--bg-primary, #1e293b); }
[data-theme="dark"] .itm-results-header { border-bottom-color: rgba(255,255,255,0.06); }
[data-theme="dark"] .itm-results-title { color: #f1f5f9; }
[data-theme="dark"] .itm-result-card { border-color: #334155; }
[data-theme="dark"] .itm-result-card-header { background: #0f172a; border-bottom-color: #334155; }
[data-theme="dark"] .itm-result-method { background: #334155; color: #cbd5e1; }
[data-theme="dark"] .itm-result-steps-area { background: #0f172a; }
[data-theme="dark"] .itm-results-footer { border-top-color: rgba(255,255,255,0.06); }
[data-theme="dark"] .itm-select-all { color: #94a3b8; }
[data-theme="dark"] .itm-pdf-header { color: #f1f5f9; }
[data-theme="dark"] .itm-pdf-page { background: #0f172a; border-color: #334155; }
[data-theme="dark"] .itm-pdf-page:hover { border-color: #6366f1; }
[data-theme="dark"] .itm-pdf-page.selected { background: rgba(99,102,241,0.08); }
[data-theme="dark"] .itm-pdf-thumb { border-color: #334155; }

/* ── Mobile ── */
@media (max-width: 640px) {
    .itm-modal { max-width: 100%; margin: 0.5rem; }
    .itm-body { padding: 0.875rem; }
    .itm-pick-list { max-height: 200px; }
    .itm-results-modal { max-width: 100%; margin: 0.5rem; }
    .itm-results-body { padding: 0.875rem; }
}