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

:root {
  --bg:        #0c1520;
  --win-bg:    #111e2f;
  --titlebar:  #0055aa;
  --titlebar2: #003d80;
  --toolbar:   #162236;
  --list-bg:   #0c1824;
  --border:    #243550;
  --text:      #dce8f8;
  --dim:       #8aa4c0;
  --orange:    #ff8800;
  --green:     #44cc77;
  --red:       #ff4455;
  --scrollbar: #1e3254;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  user-select: none;
}

/* ── Title bar ─────────────────────────────────────────────────── */
#titleBar {
  background: linear-gradient(180deg, var(--titlebar), var(--titlebar2));
  padding: .55rem 1rem;
  display: flex; align-items: center; gap: .7rem;
  flex-shrink: 0;
}
#titleBar .tb-appname { font-weight: 700; letter-spacing: .5px; }
#titleBar .tb-version { font-weight: 400; opacity: .75; font-size: .82rem; }

/* ── Drag overlay ──────────────────────────────────────────────── */
#dropOverlay {
  position: fixed; inset: 0;
  background: rgba(0,85,170,.18);
  border: 4px dashed #3388ff;
  z-index: 900;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem; color: #66aaff;
  pointer-events: none;
  opacity: 0; transition: opacity .2s;
}
#dropOverlay.active { opacity: 1; }

/* ── Drop zone (initial screen) ────────────────────────────────── */
#dropZone {
  flex: 1;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 1.2rem;
}
#dropZone.hidden { display: none; }

.dz-icon  { font-size: 5rem; line-height: 1; filter: drop-shadow(0 0 24px #0055aa88); }
.dz-title { font-size: 2rem; font-weight: 700; letter-spacing: 1px; }
.dz-sub   { font-size: .95rem; color: var(--dim); }

.dz-tags { display: flex; gap: .5rem; }
.tag {
  background: var(--toolbar); border: 1px solid var(--border);
  border-radius: 4px; padding: 3px 9px;
  font-size: .78rem; color: var(--dim);
}
.tag.hi { border-color: var(--orange); color: var(--orange); }

.btn-primary {
  background: var(--titlebar); border: none; color: #fff;
  padding: 10px 26px; border-radius: 6px;
  font-size: .95rem; cursor: pointer; transition: background .15s;
}
.btn-primary:hover { background: #0066cc; }

/* ── Viewer ────────────────────────────────────────────────────── */
#viewer { flex: 1; display: flex; flex-direction: column; min-height: 0; }
#viewer.hidden { display: none; }

#statusBar {
  background: var(--toolbar);
  border-bottom: 1px solid var(--border);
  padding: .5rem .9rem;
  display: flex; align-items: center; gap: .9rem;
  flex-shrink: 0; flex-wrap: wrap;
}
#statusBar .sb-info { font-size: .85rem; color: var(--dim); flex: 1; }
#statusBar .sb-filename { color: var(--text); font-weight: 600; margin-right: .4rem; }

.tool-btn {
  background: var(--list-bg); border: 1px solid var(--border); color: var(--text);
  padding: 6px 12px; border-radius: 5px; font-size: .85rem; cursor: pointer;
  transition: background .15s, border-color .15s;
}
.tool-btn:hover:not(:disabled) { background: var(--scrollbar); border-color: var(--titlebar); }
.tool-btn:disabled { opacity: .4; cursor: not-allowed; }
.tool-btn.primary { background: var(--titlebar); border-color: var(--titlebar2); }
.tool-btn.primary:hover:not(:disabled) { background: #0066cc; }

#imgWrap {
  flex: 1; min-height: 0;
  background:
    linear-gradient(45deg, #182338 25%, transparent 25%),
    linear-gradient(-45deg, #182338 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #182338 75%),
    linear-gradient(-45deg, transparent 75%, #182338 75%);
  background-size: 24px 24px;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0px;
  background-color: var(--list-bg);
  overflow: auto;
  display: flex; align-items: flex-start; justify-content: flex-start;
  cursor: grab;
  position: relative;
}
#imgWrap.panning { cursor: grabbing; }

#imgCanvas {
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
  margin: auto;
  box-shadow: 0 0 0 1px var(--border);
}
#imgCanvas.hidden { display: none; }

#imgError {
  margin: auto; color: var(--red); font-size: .9rem; text-align: center; padding: 2rem;
}
#imgError.hidden { display: none; }

/* ── Zoom controls ─────────────────────────────────────────────── */
.zoom-group { display: flex; align-items: center; gap: 4px; }
.zoom-display { font-size: .82rem; color: var(--dim); min-width: 3.6em; text-align: center; }

/* ── Animation bar ─────────────────────────────────────────────── */
#animBar {
  background: var(--toolbar);
  border-top: 1px solid var(--border);
  padding: .45rem .9rem;
  display: flex; align-items: center; gap: .9rem;
  flex-shrink: 0;
}
#animBar.hidden { display: none; }
.anim-bar-left, .anim-speed-group { display: flex; align-items: center; gap: 4px; }
.anim-frame-info { font-size: .82rem; color: var(--dim); margin-left: auto; }
.anim-speed-display { font-size: .82rem; color: var(--dim); min-width: 2.4em; text-align: center; }

/* ── Toast ─────────────────────────────────────────────────────── */
#toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--win-bg); border: 1px solid var(--border);
  color: var(--text); padding: .7rem 1.2rem; border-radius: 6px;
  font-size: .88rem; z-index: 950;
  opacity: 0; pointer-events: none; transition: opacity .25s;
}
#toast.show { opacity: 1; }
#toast.error { border-color: var(--red); color: #ffb3ba; }

/* ── Scrollbars ────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: var(--list-bg); }
::-webkit-scrollbar-thumb { background: var(--scrollbar); border-radius: 6px; border: 2px solid var(--list-bg); }
::-webkit-scrollbar-thumb:hover { background: #294274; }

/* ── Export settings dialog ────────────────────────────────────── */
#exportModal.hidden { display: none; }
.export-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.55);
  z-index: 850;
}
.export-box {
  position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%);
  z-index: 851;
  background: var(--win-bg); border: 1px solid var(--border); border-radius: 8px;
  width: 360px; max-width: 90vw;
  box-shadow: 0 10px 40px rgba(0,0,0,.5);
}
.export-titlebar {
  background: linear-gradient(180deg, var(--titlebar), var(--titlebar2));
  padding: .6rem 1rem;
  display: flex; align-items: center; justify-content: space-between;
  border-radius: 8px 8px 0 0;
  font-weight: 600;
}
.export-close-btn {
  background: transparent; border: none; color: #fff;
  font-size: .95rem; cursor: pointer; opacity: .85;
}
.export-close-btn:hover { opacity: 1; }
.export-body { padding: 1.2rem 1.4rem; display: flex; flex-direction: column; gap: .5rem; }
.export-label { font-size: .82rem; color: var(--dim); text-transform: uppercase; letter-spacing: .5px; }
.export-scale-options { display: flex; flex-direction: column; gap: .5rem; margin: .3rem 0 .2rem; }
.export-scale-options label { display: flex; align-items: center; gap: .5rem; font-size: .92rem; cursor: pointer; }
.export-hint { font-size: .78rem; color: var(--dim); line-height: 1.4; }
.export-size-info { font-size: .85rem; color: var(--text); min-height: 1.2em; }
.export-footer { display: flex; gap: .7rem; justify-content: flex-end; margin-top: .6rem; }
.export-repeat-row { display: flex; flex-direction: column; gap: .35rem; margin-top: .3rem; }
.export-repeat-row.hidden { display: none; }
.export-repeat-row select {
  background: var(--list-bg); color: var(--text); border: 1px solid var(--border);
  border-radius: 5px; padding: 6px 10px; font-size: .88rem; cursor: pointer;
}