*, *::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; position: relative; min-height: 0; }
#viewer.hidden { display: none; }

#settingsPanel {
  position: absolute;
  top: 20px;
  left: 20px;
  width: 320px;
  max-height: calc(100vh - 100px);
  background: var(--toolbar);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  z-index: 100;
  overflow: hidden;
}

#settingsPanelHeader {
  background: linear-gradient(180deg, var(--titlebar), var(--titlebar2));
  padding: 0.6rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: move;
  user-select: none;
  border-bottom: 1px solid var(--border);
}

.panel-title {
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.3px;
}

.panel-close-btn {
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  padding: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: background 0.15s;
}

.panel-close-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

#statusBar {
  background: var(--toolbar);
  border-top: 1px solid var(--border);
  padding: .9rem;
  display: flex;
  flex-direction: column;
  gap: .6rem;
  flex-shrink: 0;
}
#statusBar .sb-info-group { margin-bottom: .3rem; }
#statusBar .sb-info { font-size: .85rem; color: var(--dim); }
#statusBar .sb-filename { color: var(--text); font-weight: 600; display: block; margin-bottom: .3rem; }


.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;
  width: 100%;
  white-space: nowrap;
}
.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; }

/* ── Effects panel ─────────────────────────────────────────────── */
#effectsPanel {
  padding: .9rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  flex: 1;
  overflow-y: auto;
}

/* Preset section */
.preset-section {
  display: flex;
  flex-direction: column;
  gap: .6rem;
  padding-bottom: .8rem;
  border-bottom: 1px solid var(--border);
}

.preset-dropdown {
  width: 100%;
  padding: .5rem;
  background: var(--list-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: .9rem;
  cursor: pointer;
}

.preset-dropdown:hover {
  border-color: var(--titlebar);
}

.preset-buttons {
  display: flex;
  gap: .5rem;
  justify-content: space-between;
}

.preset-btn {
  flex: 1;
  padding: .4rem .5rem;
  background: var(--secondary-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: .8rem;
  cursor: pointer;
  transition: background .15s, border-color .15s;
  white-space: nowrap;
}

.preset-btn:hover:not(:disabled) {
  background: var(--scrollbar);
  border-color: var(--titlebar);
}

.preset-btn:disabled {
  opacity: .4;
  cursor: not-allowed;
}

.effect-section {
  display: flex;
  flex-direction: column;
  gap: .4rem;
}

.effect-section-row {
  flex-direction: row;
  gap: .8rem;
}

.effect-control {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: .4rem;
}

.effect-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .82rem;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: .5px;
}

.effect-name {
  font-weight: 600;
  display: flex;
  align-items: center;
}

.effect-name-text {
  cursor: pointer;
  user-select: none;
}

.effect-name-text:hover {
  color: var(--orange);
}

.effect-value {
  font-family: 'Consolas', 'Courier New', monospace;
  color: var(--orange);
  font-size: .85rem;
}

.slider {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--list-bg);
  outline: none;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--orange);
  cursor: pointer;
  border: 2px solid var(--toolbar);
  box-shadow: 0 2px 4px rgba(0,0,0,.3);
}

.slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--orange);
  cursor: pointer;
  border: 2px solid var(--toolbar);
  box-shadow: 0 2px 4px rgba(0,0,0,.3);
}

.slider:hover::-webkit-slider-thumb {
  background: #ffaa33;
}

.slider:hover::-moz-range-thumb {
  background: #ffaa33;
}

.effect-checkbox {
  display: flex;
  align-items: center;
  gap: .6rem;
  cursor: pointer;
  font-size: .9rem;
}

.effect-checkbox input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
  accent-color: var(--orange);
}

.color-picker {
  width: 60px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--list-bg);
  cursor: pointer;
  padding: 2px;
}

.color-picker::-webkit-color-swatch-wrapper {
  padding: 0;
}

.color-picker::-webkit-color-swatch {
  border: none;
  border-radius: 3px;
}

.effect-select {
  width: auto;
  max-width: 100px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--list-bg);
  color: var(--text);
  cursor: pointer;
  padding: 0 10px;
  font-size: .9rem;
  font-family: inherit;
}

.effect-select:hover {
  border-color: var(--titlebar);
  background: var(--scrollbar);
}

.effect-select:focus {
  outline: none;
  border-color: var(--orange);
}

.effect-actions {
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
}

/* ── Image display area ────────────────────────────────────────── */
#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: #0c1824;
  overflow: auto;
  display: flex; align-items: flex-start; justify-content: flex-start;
  cursor: grab;
}
#imgWrap.panning { cursor: grabbing; }

#imgCanvas {
  display: block;
  margin: auto;
  box-shadow: 0 0 40px rgba(0,0,0,.8);
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  image-rendering: crisp-edges;
  position: relative;
}

/* ── Zoom overlay (on image) ───────────────────────────────────── */
#zoomOverlay {
  position: fixed;
  z-index: 50;
  pointer-events: none;
  background: rgba(20, 35, 56, 0.85);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  backdrop-filter: blur(8px);
}

#zoomOverlay #zoomDisplay {
  font-size: 1rem;
  color: var(--orange);
  font-weight: 600;
  font-family: 'Consolas', 'Courier New', monospace;
}

/* ── 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; }

/* ── Custom input dialog ────────────────────────────────────────── */
.dialog-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  backdrop-filter: blur(4px);
}

.dialog-box {
  background: var(--win-bg);
  border: 2px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.8);
  width: 90%;
  max-width: 420px;
  animation: dialogFadeIn 0.15s ease-out;
}

@keyframes dialogFadeIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.dialog-header {
  background: linear-gradient(180deg, var(--titlebar), var(--titlebar2));
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border);
  border-radius: 6px 6px 0 0;
  font-weight: 600;
  color: var(--text);
}

.dialog-content {
  padding: 1.2rem 1rem;
}

.dialog-input {
  width: 100%;
  padding: 0.6rem;
  background: var(--list-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}

.dialog-input:focus {
  border-color: var(--titlebar);
  box-shadow: 0 0 0 2px rgba(0, 102, 204, 0.2);
}

.dialog-hint {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  font-style: italic;
}

.dialog-buttons {
  display: flex;
  gap: 0.6rem;
  padding: 1rem;
  border-top: 1px solid var(--border);
  justify-content: flex-end;
}

.dialog-btn {
  padding: 0.5rem 1.2rem;
  background: var(--secondary-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.dialog-btn:hover {
  background: var(--scrollbar);
  border-color: var(--titlebar);
}

.dialog-btn-primary {
  background: var(--titlebar);
  border-color: var(--titlebar2);
  font-weight: 600;
}

.dialog-btn-primary:hover {
  background: #0066cc;
}

/* ── 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; }