/* ── Reset + Variables ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #232733;
  --border: #2e3340;
  --text: #e8eaf0;
  --text2: #8b90a0;
  --text3: #4a4f5c;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --red: #ef4444;
  --green: #22c55e;
  --orange: #f59e0b;
  --cyan: #06b6d4;
  --header-h: 56px;
  --radius: 10px;
}
html, body { height: 100%; font-family: -apple-system, BlinkMacSystemFont, 'SF Pro', 'Segoe UI', sans-serif; font-size: 13px; color: var(--text); background: var(--bg); overflow: hidden; }

/* ── Header ── */
.header { height: var(--header-h); background: var(--surface); border-bottom: 1px solid var(--border); display: flex; align-items: center; padding: 0 20px; gap: 16px; position: fixed; top: 0; left: 0; right: 0; z-index: 100; }
.header-title { font-size: 15px; font-weight: 700; letter-spacing: -.3px; display: flex; align-items: center; gap: 8px; }
.header-title svg { opacity: .7; }
.header-sep { width: 1px; height: 24px; background: var(--border); }
.header-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }

/* ── Buttons ── */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 7px 14px; border-radius: 7px; font-size: 12px; font-weight: 500; cursor: pointer; border: none; transition: all .15s; white-space: nowrap; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled { opacity: .4; cursor: not-allowed; }
.btn-ghost { background: var(--surface2); color: var(--text2); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--border); color: var(--text); }
.btn-danger { background: rgba(239,68,68,.15); color: var(--red); border: 1px solid rgba(239,68,68,.25); }
.btn-danger:hover { background: rgba(239,68,68,.25); }
.btn-sm { padding: 4px 10px; font-size: 11px; }

/* ── Layout ── */
.app { display: flex; flex-direction: column; height: 100vh; padding-top: var(--header-h); }
.content { flex: 1; display: flex; flex-direction: column; overflow: hidden; }

/* ── Upload Section ── */
.upload-section { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; padding: 12px 20px; flex-shrink: 0; transition: all .25s ease; }
.upload-section.collapsed { grid-template-columns: 1fr 1fr; gap: 8px; padding: 6px 20px; }

/* Folder picker row (spans both columns) */
.folder-row { grid-column: 1 / -1; display: flex; align-items: center; gap: 8px; }
.folder-pick-btn { flex: 1; display: flex; align-items: center; gap: 5px; background: var(--surface2); border: 1px solid var(--border); border-radius: 7px; color: var(--text2); font-size: 10px; padding: 5px 10px; cursor: pointer; transition: border-color .15s, color .15s; overflow: hidden; }
.folder-pick-btn:hover { border-color: var(--accent); color: var(--text); }
.folder-pick-info { margin-left: auto; color: var(--accent); font-size: 9px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 120px; }

/* Folder match navigator */
.folder-nav { grid-column: 1 / -1; display: flex; flex-direction: column; gap: 6px; background: var(--surface2); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; }
.folder-nav-head { display: flex; align-items: center; justify-content: space-between; }
.folder-match-chips { display: flex; flex-wrap: wrap; gap: 4px; }
.folder-match-chip { border: 1px solid var(--border); background: var(--surface); color: var(--text2); font-size: 9px; padding: 2px 8px; border-radius: 5px; cursor: pointer; transition: all .15s; font-family: monospace; }
.folder-match-chip:hover { border-color: var(--accent); color: var(--accent); }
.folder-match-chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }

/* Hide folder rows in collapsed state */
.upload-section.collapsed .folder-row,
.upload-section.collapsed .folder-nav { display: none !important; }
.drop-zone { border: 2px dashed var(--border); border-radius: var(--radius); padding: 20px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px; cursor: pointer; transition: all .2s; min-height: 100px; position: relative; overflow: hidden; }
.upload-section.collapsed .drop-zone { min-height: 0; padding: 0; flex-direction: row; gap: 10px; border-radius: 8px; }
.upload-section.collapsed .drop-zone svg,
.upload-section.collapsed .drop-zone-hint { display: none; }
.upload-section.collapsed .drop-zone-label { font-size: 11px; }
.drop-zone:hover, .drop-zone.drag-over { border-color: var(--accent); background: rgba(99,102,241,.06); }
.drop-zone.loaded { border-color: var(--green); border-style: solid; padding: 6px; }
.upload-section.collapsed .drop-zone.loaded { padding: 4px 8px; }
.drop-zone-label { font-size: 13px; font-weight: 600; color: var(--text); }
.drop-zone-hint { font-size: 11px; color: var(--text2); }
.drop-zone-thumb { width: 100%; height: 100%; object-fit: contain; border-radius: 6px; max-height: 80px; }
.upload-section.collapsed .drop-zone-thumb { width: 32px; height: 32px; max-height: 32px; flex-shrink: 0; }
.drop-zone-badge { position: absolute; top: 6px; left: 6px; background: var(--green); color: #fff; font-size: 9px; font-weight: 700; padding: 2px 7px; border-radius: 4px; text-transform: uppercase; }
.upload-section.collapsed .drop-zone-badge { position: static; font-size: 8px; padding: 1px 5px; }
.drop-zone-clear { position: absolute; top: 6px; right: 6px; background: rgba(0,0,0,.6); color: #fff; border: none; font-size: 11px; cursor: pointer; border-radius: 4px; padding: 2px 6px; opacity: 0; transition: opacity .15s; }
.upload-section.collapsed .drop-zone-clear { position: static; opacity: 1; margin-left: auto; }
.drop-zone:hover .drop-zone-clear { opacity: 1; }
.drop-zone-info { font-size: 10px; color: var(--text2); display: none; }
.upload-section.collapsed .drop-zone-info { display: inline; }

/* Upload toggle button */
.upload-toggle { display: flex; align-items: center; gap: 6px; padding: 0 20px 0; flex-shrink: 0; }
.upload-toggle-btn { background: none; border: none; color: var(--text2); font-size: 10px; cursor: pointer; display: flex; align-items: center; gap: 4px; padding: 3px 0; }
.upload-toggle-btn:hover { color: var(--text); }
.upload-toggle-btn .arrow { transition: transform .2s; display: inline-block; font-size: 8px; }
.upload-toggle-btn .arrow.up { transform: rotate(180deg); }

/* ── Controls Bar ── */
.controls-bar { display: flex; align-items: center; gap: 12px; padding: 10px 20px; background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); flex-shrink: 0; flex-wrap: wrap; }
.control-group { display: flex; align-items: center; gap: 8px; }
.control-label { font-size: 11px; color: var(--text2); white-space: nowrap; }
.toggle { position: relative; width: 36px; height: 20px; background: var(--border); border-radius: 10px; cursor: pointer; transition: background .2s; flex-shrink: 0; }
.toggle.on { background: var(--accent); }
.toggle::after { content: ''; position: absolute; top: 2px; left: 2px; width: 16px; height: 16px; background: #fff; border-radius: 50%; transition: transform .2s; }
.toggle.on::after { transform: translateX(16px); }
.slider-wrap { display: flex; align-items: center; gap: 6px; }
.slider-wrap input[type=range] { width: 100px; accent-color: var(--accent); }
.slider-val { font-size: 10px; color: var(--text2); min-width: 28px; }
.threshold-input { width: 44px; padding: 3px 6px; border: 1px solid var(--border); border-radius: 5px; background: var(--surface2); color: var(--text); font-size: 11px; text-align: center; }
.controls-sep { width: 1px; height: 24px; background: var(--border); margin: 0 4px; }

/* ── 3-Column Main Layout ── */
.main-cols { flex: 1; display: flex; flex-direction: row; overflow: hidden; }

/* ── LEFT: Pair list column ── */
.pairs-col { width: 220px; flex-shrink: 0; display: flex; flex-direction: column; background: var(--surface); border-right: 1px solid var(--border); overflow: hidden; }
.pairs-header { display: flex; align-items: center; gap: 5px; padding: 8px 10px; border-bottom: 1px solid var(--border); flex-shrink: 0; }
.check-all-label { display: flex; align-items: center; gap: 4px; font-size: 10px; color: var(--text2); cursor: pointer; white-space: nowrap; flex-shrink: 0; margin-right: 2px; }
.check-all-label input { cursor: pointer; accent-color: var(--accent); }
.pairs-list { flex: 1; overflow-y: auto; display: flex; flex-direction: column; }
.pairs-empty { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; color: var(--text3); font-size: 11px; text-align: center; padding: 20px; gap: 4px; }
.pairs-empty span { font-size: 10px; opacity: .7; }
.pairs-footer { flex-shrink: 0; border-top: 1px solid var(--border); padding: 6px 8px; display: flex; flex-direction: column; gap: 4px; }
.pair-add-btn { display: flex; align-items: center; gap: 5px; background: var(--surface2); border: 1px solid var(--border); border-radius: 6px; color: var(--text2); font-size: 10px; padding: 5px 8px; cursor: pointer; transition: all .15s; width: 100%; }
.pair-add-btn:hover { border-color: var(--accent); color: var(--accent); background: rgba(99,102,241,.06); }
.pair-refresh-btn { border-color: rgba(6,182,212,.35); color: var(--cyan); }
.pair-refresh-btn:hover { border-color: var(--cyan); color: var(--cyan); background: rgba(6,182,212,.08); }
.pair-refresh-btn:disabled { opacity: .35; cursor: not-allowed; border-color: var(--border); color: var(--text3); background: var(--surface2); }

/* Pair item */
.pair-item { display: flex; align-items: center; gap: 6px; padding: 7px 10px; cursor: pointer; border-bottom: 1px solid rgba(46,51,64,.4); transition: background .12s; position: relative; }
.pair-item:hover { background: var(--surface2); }
.pair-item.active { background: rgba(99,102,241,.12); }
.pair-item.active::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 2px; background: var(--accent); border-radius: 0 2px 2px 0; }
.pair-check { cursor: pointer; accent-color: var(--accent); flex-shrink: 0; }
.pair-thumbs { display: flex; gap: 2px; flex-shrink: 0; }
.pair-thumb { width: 26px; height: 26px; object-fit: cover; border-radius: 4px; border: 1px solid var(--border); background: var(--surface2); }
.pair-thumb-empty { width: 26px; height: 26px; border: 1px dashed var(--border); border-radius: 4px; display: flex; align-items: center; justify-content: center; color: var(--text3); }
.pair-info { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.pair-name { font-size: 10px; font-weight: 500; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pair-meta { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.pair-status-badge { font-size: 9px; color: var(--text3); }
.pair-status-badge.status-running { color: var(--orange); }
.pair-status-badge.status-ok { color: var(--green); }
.pair-status-badge.status-issues { color: var(--red); }
.pair-status-badge.status-error { color: var(--red); }
.pai-badge { font-size: 8px; padding: 1px 5px; border-radius: 3px; font-weight: 600; }
.pai-badge.queued { background: rgba(99,102,241,.15); color: var(--accent); }
.pai-badge.running { background: rgba(245,158,11,.15); color: var(--orange); }
.pai-badge.done { background: rgba(34,197,94,.15); color: var(--green); }
.pai-badge.err { background: rgba(239,68,68,.15); color: var(--red); }
.pair-remove-btn { background: none; border: none; color: var(--text3); cursor: pointer; font-size: 11px; padding: 2px 3px; border-radius: 3px; opacity: 0; transition: opacity .15s; flex-shrink: 0; }
.pair-item:hover .pair-remove-btn { opacity: 1; }
.pair-remove-btn:hover { color: var(--red); }

/* ── CENTER: Controls + Viewer column ── */
.center-col { flex: 1; min-width: 0; display: flex; flex-direction: column; overflow: hidden; border-right: 1px solid var(--border); }
.viewer-area { flex: 1; overflow: hidden; display: flex; flex-direction: column; min-height: 0; }
.viewer-area .result-placeholder { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; color: var(--text2); gap: 8px; }
.viewer-area .result-tabs { flex-shrink: 0; align-self: flex-start; margin: 8px 12px 0; }
/* viewer-content fills remaining height; diff tab fills all; other tabs scroll */
#viewerContent { flex: 1; min-height: 0; overflow: hidden; width: 100%; display: flex; flex-direction: column; align-items: stretch; }
#tabDiff { display: flex; flex-direction: column; flex: 1; min-height: 0; width: 100%; }
#tabOverlay, #tabSideBySide, #tabSlider { overflow: hidden; display: flex; flex-direction: column; flex: 1; min-height: 0; }

/* ── Result Area: left-right split (legacy, still referenced) ── */
.result-area { flex: 1; overflow: hidden; display: flex; flex-direction: row; }

/* LEFT — image viewer column */
.viewer-col { flex: 1; min-width: 0; display: flex; flex-direction: column; overflow: hidden; border-right: 1px solid var(--border); }
.viewer-col .result-tabs { flex-shrink: 0; align-self: flex-start; margin: 8px 12px 0; }
.viewer-content { flex: 1; overflow: auto; display: flex; flex-direction: column; align-items: center; gap: 12px; padding: 12px; width: 100%; box-sizing: border-box; }

/* RIGHT — always-visible report column */
.report-col { width: 380px; flex-shrink: 0; display: flex; flex-direction: column; overflow: hidden; }
.report-col-head { display: flex; align-items: center; justify-content: space-between; padding: 10px 14px; border-bottom: 1px solid var(--border); flex-shrink: 0; background: var(--surface); }
#tabReport { flex: 1; overflow-y: auto; min-height: 0; }
.result-placeholder { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; color: var(--text2); gap: 8px; }
.result-placeholder svg { opacity: .3; }
.result-tabs { display: flex; gap: 4px; background: var(--surface); border-radius: 8px; padding: 3px; align-self: flex-start; }
.result-tab { padding: 5px 14px; border-radius: 6px; font-size: 11px; font-weight: 500; cursor: pointer; color: var(--text2); transition: all .15s; border: none; background: none; }
.result-tab.active { background: var(--accent); color: #fff; }
.result-tab:hover:not(.active) { color: var(--text); background: var(--surface2); }
.result-canvas-wrap { position: relative; display: inline-block; border-radius: var(--radius); overflow: hidden; box-shadow: 0 4px 24px rgba(0,0,0,.4); background: #222; }
.result-canvas-wrap canvas { display: block; max-width: 100%; height: auto; }
.result-info { display: flex; flex-wrap: wrap; gap: 16px; font-size: 11px; color: var(--text2); align-self: flex-start; flex-shrink: 0; padding: 6px 12px; }
.result-info-item { display: flex; align-items: center; gap: 4px; }
.result-info-dot { width: 8px; height: 8px; border-radius: 2px; }

/* ── Overlay Mode ── */
.overlay-container { position: relative; display: inline-block; border-radius: var(--radius); overflow: hidden; box-shadow: 0 4px 24px rgba(0,0,0,.4); }
.overlay-container img { display: block; max-width: 100%; height: auto; }
.overlay-top { position: absolute; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; }

/* ── Status Bar ── */
.status-bar { height: 28px; background: var(--surface); border-top: 1px solid var(--border); display: flex; align-items: center; padding: 0 16px; font-size: 10px; color: var(--text2); gap: 16px; flex-shrink: 0; }
.status-dot { width: 6px; height: 6px; border-radius: 50%; }
.status-dot.ok { background: var(--green); }
.status-dot.warn { background: var(--orange); }
.status-dot.err { background: var(--red); }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ── Animations ── */
@keyframes toastIn { from{opacity:0;transform:translateY(8px);} to{opacity:1;transform:translateY(0);} }
@keyframes spin { from{transform:rotate(0deg)} to{transform:rotate(360deg)} }