/* ============================================================
   Aspect Ratio Detector — dark, minimal, dependency-free.
   ============================================================ */

:root {
  --bg:        #0e1116;
  --bg-raised: #161b22;
  --bg-sunken: #0b0e13;
  --line:      #262d38;
  --line-soft: #1d232c;
  --text:      #e6edf3;
  --text-dim:  #9aa7b6;
  --text-mute: #6b7683;
  --accent:    #6ea8fe;
  --accent-dim:#2c4a7c;
  --good:      #62d0a0;
  --warn:      #e3b341;
  --danger:    #f0796a;
  --radius:    12px;
  --radius-sm: 8px;
  --shadow:    0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.25);
}

* { box-sizing: border-box; }

/* Several elements below set display:grid/flex, which would otherwise beat the
   [hidden] attribute we toggle from JS. */
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding: 0 20px 64px;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto,
        "Helvetica Neue", Arial, sans-serif;
  font-variant-numeric: tabular-nums;
}

/* ---------- header ---------- */

.site-header {
  max-width: 1120px;
  margin: 0 auto;
  padding: 44px 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 24px;
}
.header-text { min-width: 0; }
.site-header h1 {
  margin: 0 0 8px;
  font-size: 28px;
  font-weight: 650;
  letter-spacing: -0.02em;
}
.tagline {
  margin: 0;
  max-width: 62ch;
  color: var(--text-dim);
  font-size: 14px;
}

/* ---------- layout ---------- */

.layout {
  max-width: 1120px;
  margin: 28px auto 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}
.card-upload  { grid-column: 1 / -1; }
.card-preview { grid-row: span 2; }
.card-meta    { grid-column: 1 / -1; }

@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .card-preview { grid-row: auto; }
}

.card {
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.card h2 {
  margin: 0 0 16px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--text-mute);
}

/* ---------- dropzone ---------- */

.dropzone {
  border: 1.5px dashed var(--line);
  border-radius: var(--radius);
  background: var(--bg-sunken);
  padding: 34px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s, transform .1s;
}
.dropzone:hover,
.dropzone:focus-visible { border-color: var(--accent-dim); background: #0d1219; }
.dropzone:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.dropzone.is-drag {
  border-color: var(--accent);
  background: #101a2b;
  transform: scale(1.005);
}
.dz-icon { width: 30px; height: 30px; color: var(--text-mute); margin-bottom: 8px; }
.dz-title { margin: 0 0 4px; font-weight: 550; }
.dz-sub   { margin: 0; font-size: 13px; color: var(--text-mute); }

.file-meta {
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--text-dim);
}
.file-meta strong { color: var(--text); font-weight: 550; }

/* ---------- url input row ---------- */

.url-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
}
.url-divider {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--text-mute);
}
.url-form {
  flex: 1;
  display: flex;
  gap: 8px;
  min-width: 0;
}
.url-input {
  flex: 1;
  min-width: 0;
  padding: 9px 11px;
  background: var(--bg-sunken);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font: inherit;
  font-size: 14px;
  line-height: normal;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
}
.url-input::placeholder { color: var(--text-mute); }
.url-input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
/* Edge/Windows draws native clear (x) and reveal icons inside text-like inputs; hide them so the field matches other platforms */
.url-input::-ms-clear,
.url-input::-ms-reveal { display: none; width: 0; height: 0; }

/* ---------- fields ---------- */

.field { display: block; }
.field-label {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--text-mute);
}
.hint { display: block; margin-top: 6px; font-size: 12px; color: var(--text-mute); }
.muted { color: var(--text-mute); font-weight: 400; }

select {
  width: 100%;
  padding: 9px 11px;
  background: var(--bg-sunken);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}
select:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

/* segmented control */
.seg-field { border: 0; margin: 0; padding: 0; min-width: 0; }
.seg-field legend { padding: 0; }
.segmented {
  display: inline-flex;
  background: var(--bg-sunken);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 3px;
  gap: 3px;
}
.segmented label { position: relative; }
.segmented input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.segmented span {
  display: block;
  padding: 6px 12px;
  font-size: 13px;
  color: var(--text-dim);
  border-radius: 6px;
  cursor: pointer;
  white-space: nowrap;
  transition: background .12s, color .12s;
}
.segmented input:checked + span { background: var(--accent-dim); color: #fff; }
.segmented input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 1px; }

.overlay-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: flex-end;
  margin-bottom: 16px;
}
.overlay-controls .field:first-child { flex: 1 1 240px; }

/* ---------- preview ---------- */

.preview-shell {
  background: var(--bg-sunken);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  min-height: 220px;
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  /* checkerboard so transparent PNGs read correctly */
  background-image:
    linear-gradient(45deg, #12161d 25%, transparent 25%),
    linear-gradient(-45deg, #12161d 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #12161d 75%),
    linear-gradient(-45deg, transparent 75%, #12161d 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}
.preview-empty { margin: 0; color: var(--text-mute); font-size: 13px; }

.preview-frame {
  position: relative;
  line-height: 0;
  max-width: 100%;
}
.preview-frame img {
  display: block;
  max-width: 100%;
  max-height: 62vh;
  width: auto;
  height: auto;   /* never stretch — true aspect ratio always preserved */
}
.overlay-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;   /* clicks fall through to the <img> for the eyedropper fallback */
}
.preview-frame.is-picking { cursor: crosshair; }
.preview-frame.is-picking img { cursor: crosshair; }

.overlay-info {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--text-dim);
}
.crop-info {
  color: var(--good);
}
.eyedropper-hint {
  margin-top: 10px;
  color: var(--accent);
}

/* Save / export row under the preview. */
.save-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}
.save-info { margin-top: 0; flex: 1 1 220px; }
#saveError { margin-top: 12px; }
kbd {
  font: inherit;
  font-size: 11px;
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg-sunken);
}

/* ---------- colour picker ---------- */

.color-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: flex-end;
  margin-bottom: 18px;
}
.color-field { flex: 1 1 200px; }
.color-input-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}
input[type="color"] {
  width: 46px;
  height: 34px;
  padding: 2px;
  background: var(--bg-sunken);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.swatch {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: #000;
  flex: none;
}
.hexcode {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
  color: var(--text-dim);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  font: inherit;
  font-size: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--bg-sunken);
  color: var(--text);
  cursor: pointer;
  transition: border-color .12s, background .12s, color .12s;
}
.btn:hover:not(:disabled) { border-color: var(--accent-dim); color: #fff; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn.is-active { background: var(--accent-dim); border-color: var(--accent); color: #fff; }
.btn-icon { width: 16px; height: 16px; }

/* ---------- slider ---------- */

.slider-field { margin-bottom: 18px; }
.slider-field output { color: var(--text); font-variant-numeric: tabular-nums; }
input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ---------- checkboxes ---------- */

.checks {
  border-top: 1px solid var(--line-soft);
  padding-top: 16px;
}
.check {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  padding: 5px 0;
  cursor: pointer;
  font-size: 14px;
}
.check input {
  margin: 2px 0 0;
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
  flex: none;
}
.check em { font-style: normal; color: var(--text-mute); font-size: 13px; }
.check-master { font-weight: 550; }
.check:has(input:disabled) { opacity: .42; cursor: not-allowed; }
.check:has(input:disabled) input { cursor: not-allowed; }
.check-sub {
  margin: 4px 0 0 26px;
  padding-left: 12px;
  border-left: 1px solid var(--line-soft);
}
.check-sub.is-disabled { opacity: .42; }
.check-sub.is-disabled .check { cursor: not-allowed; }
.check-sub.is-disabled .check input { cursor: not-allowed; }

/* ---------- border sizes readout ---------- */

.border-sizes {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-top: 16px;
}
.bs-cell {
  background: var(--bg-sunken);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  padding: 9px 10px;
  text-align: center;
}
.bs-cell .bs-label {
  display: block;
  font-size: 11px;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--text-mute);
}
.bs-cell .bs-value {
  display: block;
  margin-top: 2px;
  font-size: 15px;
  font-weight: 600;
}
.bs-cell.is-hit .bs-value { color: var(--good); }

/* ---------- results ---------- */

.results { display: grid; gap: 16px; }
.result-block {
  background: var(--bg-sunken);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  padding: 16px;
}
.result-block-adj { border-color: var(--accent-dim); }
.result-kicker {
  margin: 0 0 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-mute);
}
.tag {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 7px;
  border-radius: 999px;
  background: var(--accent-dim);
  color: #dce9ff;
  font-size: 10px;
  letter-spacing: .04em;
}
.result-main {
  margin: 0 0 10px;
  font-size: 40px;
  line-height: 1.05;
  font-weight: 650;
  letter-spacing: -0.025em;
}
.result-sub { margin: 0; display: flex; flex-wrap: wrap; gap: 7px; }
.pill {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg-raised);
  font-size: 13px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.pill-quiet { color: var(--text-mute); }
.result-match { margin: 10px 0 0; font-size: 13px; color: var(--good); }

/* ---------- metadata ---------- */

.meta-groups { display: grid; gap: 14px; }
.meta-group {
  background: var(--bg-sunken);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}
.meta-group-title {
  margin: 0 0 8px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-mute);
}
.meta-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 6px 0;
  border-top: 1px solid var(--line-soft);
  font-size: 13.5px;
}
.meta-row:first-of-type { border-top: 0; }
.meta-label { color: var(--text-dim); flex: none; }
.meta-value {
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  text-align: right;
  word-break: break-word;
}
.meta-value a { color: var(--accent); text-decoration: none; }
.meta-value a:hover { text-decoration: underline; }
.meta-group-note {
  margin: 8px 0 0;
  font-size: 12px;
  color: var(--text-mute);
}

/* ---------- messages ---------- */

.error-msg, .warn-msg {
  margin: 14px 0 0;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
}
.error-msg { background: #2a1512; border: 1px solid #5a2a22; color: var(--danger); }
.warn-msg  { background: #2a2313; border: 1px solid #5a4a22; color: var(--warn); }

/* ---------- busy overlay ---------- */

.busy {
  position: fixed;
  inset: 0;
  background: rgba(8, 11, 15, .72);
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}
.busy-box {
  display: flex;
  align-items: center;
  gap: 13px;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 22px;
  box-shadow: var(--shadow);
}
.busy-box p { margin: 0; font-size: 14px; }
.spinner {
  width: 20px; height: 20px;
  border: 2.5px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  .spinner { animation-duration: 2s; }
  .dropzone { transition: none; }
}

/* ---------- repo link ---------- */

.repo-link {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-raised);
  color: var(--text-dim);
  font-size: 13px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  text-decoration: none;
  transition: border-color .15s, color .15s, transform .15s, box-shadow .15s;
}
.repo-link-icon { width: 15px; height: 15px; flex: none; }
.repo-link:hover,
.repo-link:focus-visible {
  color: var(--text);
  border-color: var(--accent-dim);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}
.repo-link:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

@media (max-width: 520px) {
  body { padding: 0 14px 48px; }
  .site-header { padding-top: 30px; }
  .card { padding: 16px; }
  .result-main { font-size: 32px; }
  .border-sizes { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}