/* ─────────────────────────────────────────────────────────────────────────────
   app.css — FileCompare MVP application styles
   FileCompare · 3K Digital
───────────────────────────────────────────────────────────────────────────── */

/* ── App shell ─────────────────────────────────────────────────────────────── */
#app {
  display: none;          /* shown by JS */
  flex-direction: column;
  height: 100vh;
  background: var(--bg);
}

/* ── App toolbar ───────────────────────────────────────────────────────────── */
.app-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  flex-shrink: 0;
}

.app-bar-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.back-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 6px 11px;
  border-radius: var(--radius);
  border: 1px solid var(--border2);
  font-size: 12px;
  color: var(--text2);
  background: none;
  cursor: pointer;
  transition: all 0.18s;
  font-family: var(--font);
}
.back-btn:hover { border-color: var(--border3); color: var(--text); background: var(--bg3); }

.app-name {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
}

.app-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ctrl {
  padding: 5px 11px;
  border-radius: 6px;
  border: 1px solid var(--border2);
  font-size: 12px;
  color: var(--text2);
  background: var(--bg3);
  cursor: pointer;
  transition: all 0.18s;
  font-family: var(--font);
  display: flex;
  align-items: center;
  gap: 5px;
}
.ctrl:hover   { border-color: var(--border3); color: var(--text); }
.ctrl.on      { border-color: var(--border3); color: var(--text); background: var(--bg4); }

.vsep {
  width: 1px;
  height: 20px;
  background: var(--border);
  flex-shrink: 0;
}

/* ── Upload view ───────────────────────────────────────────────────────────── */
#upload-view {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
}

.up-pane {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px;
}
.up-pane:first-child { border-right: 1px solid var(--border); }

.up-label {
  font-size: 11px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 20px;
  font-weight: 500;
}

.drop-zone {
  position: relative;
  width: 100%;
  max-width: 340px;
  border: 2px dashed var(--border2);
  border-radius: var(--radius-lg);
  padding: 48px 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}
.drop-zone:hover,
.drop-zone.drag {
  border-color: var(--border3);
  background: var(--bg2);
}
.drop-zone.drag {
  border-color: #444;
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.03);
}

/* Hidden file input covers entire zone */
.drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

.dz-icon {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-lg);
  background: var(--bg3);
  border: 1px solid var(--border2);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.dz-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--text2);
}

.dz-title { font-size: 14px; font-weight: 500; color: var(--text); }
.dz-hint  { font-size: 12px; color: var(--text3); }
.dz-types { font-size: 11px; color: var(--text3); }

/* File chip — shown after successful load */
.file-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 13px;
  border-radius: var(--radius);
  background: var(--bg3);
  border: 1px solid var(--border2);
  margin-top: 12px;
  width: 100%;
  max-width: 340px;
}

.chip-icon {
  width: 30px;
  height: 30px;
  border-radius: 6px;
  background: var(--bg4);
  border: 1px solid var(--border2);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.chip-icon svg { width: 13px; height: 13px; stroke: var(--text2); }

.chip-info  { flex: 1; min-width: 0; }
.chip-name  { font-size: 13px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chip-size  { font-size: 11px; color: var(--text3); margin-top: 1px; }

.chip-rm {
  padding: 4px;
  border-radius: 4px;
  color: var(--text3);
  cursor: pointer;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  transition: color 0.18s;
  flex-shrink: 0;
}
.chip-rm:hover { color: var(--red-text); }

/* Error box */
.err-box {
  padding: 11px 14px;
  border-radius: var(--radius);
  background: var(--red-bg);
  border: 1px solid var(--red-border);
  color: var(--red-text);
  font-size: 13px;
  margin-top: 10px;
  width: 100%;
  max-width: 340px;
  line-height: 1.5;
}

/* ── Compare view ──────────────────────────────────────────────────────────── */
#compare-view {
  flex: 1;
  display: none;           /* shown by JS */
  flex-direction: column;
  overflow: hidden;
}

.panels {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

.panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
  flex: 1;
}
.panel:first-child { border-right: 1px solid var(--border); }

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  flex-shrink: 0;
}

.panel-fn {
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 220px;
  color: var(--text);
}

.panel-stat { font-size: 11px; }
.pstat-a    { color: var(--green-text); }
.pstat-d    { color: var(--red-text); }

.panel-body {
  flex: 1;
  overflow: auto;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.7;
  will-change: scroll-position;
}

/* ── Diff lines ────────────────────────────────────────────────────────────── */
.dl {
  display: flex;
  min-width: max-content;
  width: 100%;
}

/* Line type backgrounds */
.dl.add   { background: var(--green-bg); }
.dl.del   { background: var(--red-bg); }
.dl.chg-a { background: var(--green-bg); }
.dl.chg-d { background: var(--red-bg); }
.dl.empty { background: rgba(255, 255, 255, 0.015); }

/* Gutter */
.dl-gutter { display: flex; flex-shrink: 0; }

.dl-num {
  width: 44px;
  padding: 0 8px;
  text-align: right;
  color: var(--text3);
  font-size: 11px;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-shrink: 0;
}
.dl.empty .dl-num { color: transparent; }

.dl-sign {
  width: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  flex-shrink: 0;
}
.dl.add   .dl-sign { color: var(--green-text); }
.dl.del   .dl-sign { color: var(--red-text); }
.dl.chg-d .dl-sign { color: var(--red-text); }
.dl.chg-a .dl-sign { color: var(--green-text); }

/* Content */
.dl-content {
  padding: 0 12px;
  white-space: pre;
  color: var(--text);
}
.dl.add   .dl-content,
.dl.chg-a .dl-content { color: var(--green-text); }
.dl.del   .dl-content,
.dl.chg-d .dl-content { color: var(--red-text); }

/* Character-level diff highlights */
.ch-a {
  background: rgba(74, 222, 128, 0.28);
  border-radius: 2px;
}
.ch-d {
  background: rgba(248, 113, 113, 0.28);
  border-radius: 2px;
  text-decoration: line-through;
  text-decoration-color: var(--red-text);
}

/* ── Resizer ───────────────────────────────────────────────────────────────── */
.resizer {
  width: 4px;
  background: var(--border);
  cursor: col-resize;
  flex-shrink: 0;
  transition: background 0.2s;
  position: relative;
  z-index: 5;
}
.resizer:hover,
.resizer.active { background: var(--border3); }

/* ── Status bar ────────────────────────────────────────────────────────────── */
.status-bar {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 7px 18px;
  border-top: 1px solid var(--border);
  background: var(--bg2);
  font-size: 12px;
  color: var(--text3);
  flex-shrink: 0;
}

.sb-dot {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  display: inline-block;
  margin-right: 5px;
}

/* ── Loading overlay ───────────────────────────────────────────────────────── */
.loading {
  position: absolute;
  inset: 0;
  background: rgba(10, 10, 10, 0.88);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  z-index: 50;
  backdrop-filter: blur(6px);
}

.spinner {
  width: 28px;
  height: 28px;
  border: 2px solid var(--border2);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}

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

.loading p {
  font-size: 13px;
  color: var(--text2);
}

/* ── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 700px) {
  #upload-view {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr;
  }
  .up-pane:first-child {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
}