*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg: #0f1117;
    --surface: #1a1d27;
    --surface2: #232733;
    --border: #2e3345;
    --text: #e2e4ed;
    --text-muted: #8b8fa3;
    --accent: #6c8cff;
    --green: #2ea043;
    --green-bg: rgba(46, 160, 67, 0.15);
    --green-text: #56d364;
    --red: #da3633;
    --red-bg: rgba(218, 54, 51, 0.15);
    --red-text: #f85149;
    --yellow-bg: rgba(210, 153, 34, 0.12);
    --yellow-text: #e3b341;
    --blue-bg: rgba(56, 139, 253, 0.12);
    --blue-text: #58a6ff;

    --sug-del-bg: rgba(245, 158, 11, 0.18);
    --sug-del-text: #fbbf24;
    --sug-ins-bg: rgba(6, 182, 212, 0.18);
    --sug-ins-text: #22d3ee;
    --sug-notapplied-bg: rgba(245, 158, 11, 0.08);
    --sug-notapplied-border: rgba(245, 158, 11, 0.35);

    --radius: 10px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

header { text-align: center; padding: 2rem 1rem 0.5rem; }
header h1 { font-size: 1.75rem; font-weight: 700; letter-spacing: -0.02em; }
.subtitle { color: var(--text-muted); margin-top: 0.3rem; font-size: 0.95rem; }

main { max-width: 1200px; margin: 0 auto; padding: 1rem 1.5rem 3rem; }

/* Steps indicator */
.steps {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}
.step {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
    background: var(--surface);
    border: 1px solid var(--border);
    transition: all 0.3s;
}
.step.active {
    color: #fff;
    background: var(--accent);
    border-color: var(--accent);
}
.step.done {
    color: var(--green-text);
    border-color: var(--green);
}
.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 700;
    background: rgba(255,255,255,0.15);
}

/* Step panels */
.step-panel { animation: fadeIn 0.3s ease; }
.step-panel h2 { font-size: 1.2rem; margin-bottom: 0.3rem; }
.step-desc { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 1.25rem; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.hidden { display: none !important; }

/* Drop zone */
.drop-zone {
    background: var(--surface);
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 2.5rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    max-width: 500px;
    margin: 0 auto;
}
.drop-zone:hover, .drop-zone.dragover { border-color: var(--accent); background: var(--surface2); }
.drop-zone.has-file { border-color: var(--green); border-style: solid; }
.drop-icon { font-size: 2.5rem; margin-bottom: 0.5rem; }
.drop-label { font-weight: 600; font-size: 1.1rem; margin-bottom: 0.25rem; }
.drop-hint { color: var(--text-muted); font-size: 0.85rem; }
.file-name { margin-top: 0.75rem; font-size: 0.85rem; color: var(--green-text); word-break: break-all; }

/* Buttons */
.actions { text-align: center; margin-top: 1.5rem; display: flex; gap: 0.75rem; justify-content: center; }

button {
    font-family: inherit;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    border-radius: 8px;
    padding: 0.7rem 2rem;
    font-weight: 600;
    transition: background 0.2s, opacity 0.2s, filter 0.2s;
    background: var(--accent);
    color: #fff;
}
button:disabled { opacity: 0.4; cursor: not-allowed; }
button:not(:disabled):hover { filter: brightness(1.15); }
.btn-secondary {
    background: var(--surface2);
    color: var(--text-muted);
    border: 1px solid var(--border);
}
.btn-secondary:hover { color: var(--text); }

/* Loading / Error */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}
.spinner {
    width: 22px; height: 22px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.error {
    background: var(--red-bg);
    color: var(--red-text);
    padding: 1rem 1.25rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

/* Color cards (Step 2) */
.color-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-bottom: 1rem;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 1rem;
    align-items: center;
}
.color-swatch {
    width: 48px;
    height: 48px;
    border-radius: 8px;
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.03em;
}
.color-info { min-width: 0; }
.color-info .count { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 0.3rem; }
.color-samples {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.5;
}
.color-samples .sample {
    background: var(--surface2);
    padding: 2px 6px;
    border-radius: 4px;
    display: inline-block;
    margin: 2px 4px 2px 0;
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.color-meaning select {
    background: var(--surface2);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
    font-family: inherit;
    cursor: pointer;
    min-width: 180px;
}
.color-meaning select:focus { outline: none; border-color: var(--accent); }

/* Suggestion panel */
.suggestion-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-bottom: 1.25rem;
}
.suggestion-panel h3 { font-size: 1rem; margin-bottom: 0.75rem; }

.suggestion-stats {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}
.sug-stat {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    border: 1px solid var(--border);
}
.sug-stat .num { font-weight: 700; font-size: 1.1rem; }
.sug-stat.applied { border-color: var(--green); }
.sug-stat.applied .num { color: var(--green-text); }
.sug-stat.not-applied { border-color: var(--red); }
.sug-stat.not-applied .num { color: var(--red-text); }

.suggestion-list {
    max-height: 400px;
    overflow-y: auto;
}
.sug-item {
    display: grid;
    grid-template-columns: 28px 1fr auto;
    gap: 0.6rem;
    align-items: start;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.83rem;
    line-height: 1.5;
}
.sug-item:last-child { border-bottom: none; }
.sug-icon { font-size: 1.1rem; text-align: center; padding-top: 2px; }
.sug-text { word-break: break-word; }
.sug-text .para-ctx { color: var(--text-muted); font-size: 0.78rem; margin-top: 2px; }
.sug-badge {
    font-size: 0.72rem;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
    white-space: nowrap;
}
.sug-badge.applied { background: var(--green-bg); color: var(--green-text); }
.sug-badge.not-applied { background: var(--red-bg); color: var(--red-text); }
.sug-badge.note { background: var(--blue-bg); color: var(--blue-text); }

/* Filter tabs for suggestions */
.sug-filters {
    display: flex;
    gap: 0.4rem;
    margin-bottom: 0.75rem;
}
.sug-filter-btn {
    background: var(--surface2);
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 0.3rem 0.8rem;
    font-size: 0.8rem;
    border-radius: 6px;
}
.sug-filter-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Stats bar */
.stats-bar { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 1rem; }
.stat-chip {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.45rem 0.9rem;
    font-size: 0.83rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}
.stat-chip .num { font-weight: 700; font-size: 1rem; }
.stat-chip.added .num { color: var(--green-text); }
.stat-chip.deleted .num { color: var(--red-text); }
.stat-chip.changed .num { color: var(--yellow-text); }

/* View toggle */
.view-toggle { display: flex; gap: 0.5rem; margin-bottom: 1rem; align-items: center; flex-wrap: wrap; }
.view-btn {
    background: var(--surface);
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 0.45rem 1.1rem;
    font-size: 0.85rem;
}
.view-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.download-btn {
    background: var(--surface);
    color: var(--green-text);
    border: 1px solid var(--green);
    padding: 0.45rem 1.1rem;
    font-size: 0.85rem;
}
.download-btn:hover { background: var(--green-bg); }
.download-btn.pdf { color: var(--blue-text); border-color: var(--blue-text); }
.download-btn.pdf:hover { background: var(--blue-bg); }

/* Diff container */
.diff-container {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.diff-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-bottom: 1px solid var(--border);
    font-size: 0.86rem;
    line-height: 1.7;
}
.diff-row:last-child { border-bottom: none; }
.diff-cell { padding: 0.3rem 0.8rem; white-space: pre-wrap; word-break: break-word; min-height: 1.7em; }
.diff-cell.left { border-right: 1px solid var(--border); }
.diff-row.equal .diff-cell { color: var(--text-muted); }

/* Unexpected (not suggested) – red/green */
.diff-row.unexpected_delete .left { background: var(--red-bg); }
.diff-row.unexpected_insert .right { background: var(--green-bg); }
.diff-row.unexpected_change .left { background: var(--red-bg); }
.diff-row.unexpected_change .right { background: var(--green-bg); }

/* Suggested (was in colored segments) – amber/cyan */
.diff-row.suggested_delete .left { background: var(--sug-del-bg); }
.diff-row.suggested_insert .right { background: var(--sug-ins-bg); }
.diff-row.suggested_change .left { background: var(--sug-del-bg); }
.diff-row.suggested_change .right { background: var(--sug-ins-bg); }

/* Suggested but not applied – subtle amber border */
.diff-row.suggested_not_applied .diff-cell {
    border-left: 3px solid var(--sug-notapplied-border);
    background: var(--sug-notapplied-bg);
    color: var(--text-muted);
}

.inline-row {
    padding: 0.3rem 0.8rem;
    font-size: 0.86rem;
    line-height: 1.7;
    border-bottom: 1px solid var(--border);
    white-space: pre-wrap;
    word-break: break-word;
}
.inline-row:last-child { border-bottom: none; }
.inline-row.equal { color: var(--text-muted); }

.inline-row.unexpected_delete { background: var(--red-bg); }
.inline-row.unexpected_insert { background: var(--green-bg); }
.inline-row.unexpected_change-old { background: var(--red-bg); }
.inline-row.unexpected_change-new { background: var(--green-bg); }

.inline-row.suggested_delete { background: var(--sug-del-bg); }
.inline-row.suggested_insert { background: var(--sug-ins-bg); }
.inline-row.suggested_change-old { background: var(--sug-del-bg); }
.inline-row.suggested_change-new { background: var(--sug-ins-bg); }

.inline-row.suggested_not_applied {
    border-left: 3px solid var(--sug-notapplied-border);
    background: var(--sug-notapplied-bg);
    color: var(--text-muted);
}

/* Unexpected (default) word-level diffs: red / green */
.wd-delete { background: rgba(218,54,51,0.3); color: var(--red-text); text-decoration: line-through; border-radius: 3px; padding: 0 2px; }
.wd-insert { background: rgba(46,160,67,0.3); color: var(--green-text); border-radius: 3px; padding: 0 2px; }
/* Suggested word-level diffs: amber / cyan */
.wd-delete.sug { background: rgba(245,158,11,0.35); color: #fbbf24; }
.wd-insert.sug { background: rgba(6,182,212,0.35); color: #22d3ee; }
/* Suggested removal NOT applied: amber dashed underline + subtle bg */
.wd-sug-na {
    background: rgba(245,158,11,0.12);
    text-decoration: underline wavy rgba(245,158,11,0.7);
    text-underline-offset: 2px;
    border-radius: 3px;
    padding: 0 2px;
}
.cd-delete { background: rgba(218,54,51,0.45); text-decoration: line-through; border-radius: 2px; }
.cd-insert { background: rgba(46,160,67,0.45); border-radius: 2px; }
.cd-delete.sug { background: rgba(245,158,11,0.5); color: #fbbf24; }
.cd-insert.sug { background: rgba(6,182,212,0.5); color: #22d3ee; }

.ln {
    display: inline-block;
    width: 3em;
    text-align: right;
    color: var(--text-muted);
    opacity: 0.5;
    margin-right: 0.6rem;
    user-select: none;
    font-size: 0.76rem;
}

/* Diff filter panel */
.diff-filters {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    margin-bottom: 0.75rem;
}

/* Preset buttons row */
.filter-presets {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
    margin-bottom: 0.85rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}
.preset-btn {
    background: var(--surface2);
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 0.3rem 0.75rem;
    font-size: 0.78rem;
    border-radius: 6px;
}
.preset-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Filter groups */
.filter-group { margin-bottom: 0.6rem; }
.filter-group:last-child { margin-bottom: 0; }
.filter-group-title {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.4rem;
}
.filter-checks {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}
.filter-check {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.65rem;
    border-radius: 6px;
    font-size: 0.78rem;
    cursor: pointer;
    border: 1px solid var(--border);
    background: var(--surface2);
    color: var(--text-muted);
    transition: all 0.15s;
    user-select: none;
}
.filter-check:has(input:checked) {
    color: var(--text);
    border-color: var(--accent);
    background: rgba(108, 140, 255, 0.08);
}
.filter-check input[type="checkbox"] {
    width: 14px; height: 14px;
    accent-color: var(--accent);
    cursor: pointer;
    margin: 0;
}
.check-icon {
    font-size: 0.85rem;
    flex-shrink: 0;
    width: 1em;
    text-align: center;
}
.check-label { white-space: nowrap; }
.check-cnt {
    font-weight: 700;
    font-size: 0.7rem;
    background: rgba(255,255,255,0.08);
    padding: 1px 5px;
    border-radius: 4px;
    min-width: 18px;
    text-align: center;
    margin-left: auto;
}

/* Color-coded filter checks */
.filter-check.sug-ok:has(input:checked) { border-color: var(--sug-del-text); background: rgba(245,158,11,0.12); }
.filter-check.sug-ok .check-icon { color: var(--green-text); }
.filter-check.sug-fail:has(input:checked) { border-color: #f87171; background: rgba(248,113,113,0.1); }
.filter-check.sug-fail .check-icon { color: var(--red-text); }
.filter-check.note-tag:has(input:checked) { border-color: var(--blue-text); background: var(--blue-bg); }
.filter-check.note-tag .check-icon { color: var(--blue-text); }
.filter-check.unexp-del:has(input:checked) { border-color: var(--red); background: var(--red-bg); }
.filter-check.unexp-del .check-icon { color: var(--red-text); }
.filter-check.unexp-ins:has(input:checked) { border-color: var(--green); background: var(--green-bg); }
.filter-check.unexp-ins .check-icon { color: var(--green-text); }
.filter-check.unexp-chg:has(input:checked) { border-color: var(--yellow-text); background: var(--yellow-bg); }
.filter-check.unexp-chg .check-icon { color: var(--yellow-text); }
.filter-check.eq-tag:has(input:checked) { border-color: var(--text-muted); }
.filter-check.empty-tag:has(input:checked) { border-color: #94a3b8; background: rgba(148,163,184,0.1); }
.filter-check.empty-tag .check-icon { color: #94a3b8; }
.filter-check.ws-tag:has(input:checked) { border-color: #a78bfa; background: rgba(167,139,250,0.1); }
.filter-check.ws-tag .check-icon { color: #a78bfa; }

/* Filter counter */
.filter-counter {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    padding-left: 0.25rem;
}

/* Filtered out rows */
.diff-row.filtered-out, .inline-row.filtered-out { display: none !important; }

/* Category tags shown on each diff row */
.cat-tags {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 2px;
    margin-right: 0.4rem;
    vertical-align: middle;
}
.cat-tag {
    font-size: 0.6rem;
    padding: 1px 5px;
    border-radius: 3px;
    font-weight: 600;
    white-space: nowrap;
    display: inline-block;
    line-height: 1.4;
}
.cat-tag.sug { background: rgba(245,158,11,0.2); color: var(--sug-del-text); }
.cat-tag.unexp { background: var(--red-bg); color: var(--red-text); }
.cat-tag.sug-na { background: rgba(245,158,11,0.12); color: var(--sug-del-text); }
.cat-tag.note-t { background: var(--blue-bg); color: var(--blue-text); }

/* PDF generation: report wrapper */
#pdfReport { position: absolute; left: -9999px; top: 0; }

@media (max-width: 700px) {
    .diff-row { grid-template-columns: 1fr; }
    .diff-cell.left { border-right: none; border-bottom: 1px solid var(--border); }
    .color-card { grid-template-columns: 1fr; }
}

/* New compare button */
.new-compare-btn {
    background: #8b1a2b;
    color: #fff;
    border: 1px solid #8b1a2b;
    padding: 0.5rem 1.25rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    margin-left: auto;
}
.new-compare-btn:hover {
    background: #a52238;
    border-color: #a52238;
}

@media print {
    body { background: #fff; color: #000; }
    .steps, .actions, .view-toggle, header { display: none; }
}