/* ── Reset / base ───────────────────────────────────────────────────────── */
:root {
  --color-calibrate: #ef4444;
  --color-measure:   #22c55e;
  --color-hover:     #86efac;
  --color-bg-canvas: #111827;
  --sidebar-width:   320px;
}

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

html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

/* ── App shell ──────────────────────────────────────────────────────────── */
#app {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  height: 100dvh;
  overflow: hidden;
}

/* ── Sidebar ────────────────────────────────────────────────────────────── */
#sidebar {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  overflow-y: auto;
  border-right: 1px solid var(--pico-muted-border-color);
  padding: 1.25rem;
  background: var(--pico-background-color);
}

#sidebar header {
  padding: 0;
  margin: 0;
  background: none;
}

#sidebar header h1 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0;
  display: flex;
  align-items: center;
  letter-spacing: -0.02em;
}

/* ── Upload zone ────────────────────────────────────────────────────────── */
#upload-zone {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
}

#drop-target {
  width: 100%;
  border: 2px dashed var(--pico-muted-border-color);
  border-radius: 12px;
  padding: 2.25rem 1.25rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--pico-muted-color);
}

#drop-target svg {
  opacity: 0.45;
  margin-bottom: 0.25rem;
}

#drop-target p {
  margin: 0;
  font-size: 0.95rem;
}

#drop-target .muted {
  font-size: 0.8rem;
  opacity: 0.6;
}

#drop-target label[role="button"] {
  margin-top: 0.25rem;
  font-size: 0.88rem;
  padding: 0.4rem 1.25rem;
  cursor: pointer;
}

#drop-target.drag-over {
  border-color: var(--pico-primary);
  background: color-mix(in srgb, var(--pico-primary) 8%, transparent);
  color: var(--pico-primary);
}

#file-input {
  display: none;
}

/* URL input section */
.url-section {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.url-divider {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--pico-muted-color);
  font-size: 0.78rem;
  opacity: 0.6;
}

.url-divider::before,
.url-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--pico-muted-border-color);
}

#image-url-input {
  width: 100%;
  font-size: 0.88rem;
  margin: 0;
}

.url-hint {
  font-size: 0.75rem;
  color: var(--pico-muted-color);
  opacity: 0.65;
  text-align: center;
  margin: 0;
}

#url-error {
  font-size: 0.8rem;
  color: var(--color-calibrate);
  margin: 0;
  line-height: 1.4;
}

/* ── Mode buttons ───────────────────────────────────────────────────────── */
#mode-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
}

.mode-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  padding: 0.55rem 0.5rem;
  border-radius: 8px;
  font-weight: 600;
  --pico-background-color: transparent;
  border: 1.5px solid var(--pico-muted-border-color);
  color: var(--pico-muted-color);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.mode-btn.active[data-mode="calibrate"],
#btn-calibrate.active {
  border-color: var(--color-calibrate);
  color: var(--color-calibrate);
  background: color-mix(in srgb, var(--color-calibrate) 10%, transparent);
}

.mode-btn.active[data-mode="measure"],
#btn-measure.active {
  border-color: var(--color-measure);
  color: var(--color-measure);
  background: color-mix(in srgb, var(--color-measure) 10%, transparent);
}

.mode-btn:not(.active):hover {
  border-color: var(--pico-color);
  color: var(--pico-color);
}

/* ── Calibration status ─────────────────────────────────────────────────── */
#calibration-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--pico-muted-color);
  padding: 0.3rem 0;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  display: inline-block;
}

.dot.uncalibrated { background: var(--color-calibrate); opacity: 0.5; }
.dot.calibrated   { background: var(--color-measure); }

#btn-edit-scale {
  background: none;
  border: none;
  color: var(--pico-muted-color);
  cursor: pointer;
  padding: 0 0.25rem;
  font-size: 0.9rem;
  line-height: 1;
  opacity: 0.6;
  margin-left: auto;
  transition: opacity 0.15s, color 0.15s;
}

#btn-edit-scale:hover {
  opacity: 1;
  color: var(--pico-color);
}

/* ── Results list ───────────────────────────────────────────────────────── */
#results-header {
  margin-bottom: 0.25rem;
  color: var(--pico-muted-color);
}

#results-list {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.measurement-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.6rem;
  border-radius: 6px;
  cursor: default;
  transition: background 0.1s;
  border: 1px solid transparent;
}

.measurement-row:hover {
  background: color-mix(in srgb, var(--color-measure) 10%, transparent);
  border-color: color-mix(in srgb, var(--color-measure) 30%, transparent);
}

.measurement-index {
  font-size: 0.75rem;
  color: var(--pico-muted-color);
  min-width: 24px;
  font-family: 'JetBrains Mono', monospace;
}

.measurement-value {
  flex: 1;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-measure);
}

.measurement-delete {
  background: none;
  border: none;
  color: var(--pico-muted-color);
  cursor: pointer;
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
  font-size: 0.8rem;
  line-height: 1;
  opacity: 0;
  transition: opacity 0.15s, color 0.15s;
}

.measurement-row:hover .measurement-delete {
  opacity: 1;
}

.measurement-delete:hover {
  color: var(--color-calibrate) !important;
  background: color-mix(in srgb, var(--color-calibrate) 12%, transparent);
}

/* ── Action buttons ─────────────────────────────────────────────────────── */
#action-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
}

#action-buttons button {
  font-size: 0.88rem;
  padding: 0.5rem 0.5rem;
}

/* ── Help text ──────────────────────────────────────────────────────────── */
#help-text {
  color: var(--pico-muted-color);
  text-align: center;
  font-size: 0.78rem;
  padding-top: 0.25rem;
}

#controls hr {
  margin: 0.25rem 0;
  border-color: var(--pico-muted-border-color);
}

/* ── Canvas area ────────────────────────────────────────────────────────── */
#canvas-area {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-canvas);
  position: relative;
  overflow: hidden;
}

#canvas-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  color: #4b5563;
  user-select: none;
}

#canvas-placeholder p {
  margin: 0;
  font-size: 1rem;
}

#mobile-pick-btn {
  display: none;
}

@media (max-width: 700px) {
  #mobile-pick-btn {
    display: inline-block;
    margin-top: 0.5rem;
    font-size: 1rem;
    padding: 0.6rem 1.5rem;
  }
}

#canvas-wrapper {
  position: relative;
  line-height: 0;
}

#main-canvas {
  display: block;
  cursor: crosshair;
  max-width: 100%;
  touch-action: none;
}

#status-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.6);
  color: #e5e7eb;
  font-size: 0.78rem;
  padding: 4px 10px;
  pointer-events: none;
  font-family: 'JetBrains Mono', monospace;
  backdrop-filter: blur(2px);
}

/* ── Dialog ─────────────────────────────────────────────────────────────── */
#calibration-dialog {
  max-width: 380px;
  width: calc(100% - 2rem);
}

#calibration-dialog article {
  padding: 1.5rem;
}

#calibration-dialog header {
  background: none;
  padding: 0;
  margin-bottom: 0.75rem;
}

#calibration-dialog h3 {
  margin: 0;
  font-size: 1.05rem;
}

#calibration-dialog p {
  margin-bottom: 1rem;
  font-size: 0.9rem;
  color: var(--pico-muted-color);
}

.dialog-fields {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.dialog-fields label {
  font-size: 0.85rem;
  margin: 0;
}

.dialog-fields input,
.dialog-fields select {
  margin-top: 0.3rem;
}

#calibration-dialog footer {
  background: none;
  padding: 0;
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

#calibration-dialog footer button {
  margin: 0;
  padding: 0.5rem 1.25rem;
  font-size: 0.88rem;
}

/* ── Privacy notice ─────────────────────────────────────────────────────── */
#privacy-notice {
  margin-top: auto;
  padding: 0.6rem 0 0.25rem;
  border-top: 1px solid var(--pico-muted-border-color);
  font-size: 0.75rem;
  color: var(--pico-muted-color);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  opacity: 0.7;
}

.privacy-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.author-row {
  font-style: italic;
}

/* ── Mobile bar (hidden on desktop) ─────────────────────────────────────── */
#mobile-bar {
  display: none;
}

#drawer-overlay {
  display: none;
}

/* ── Mobile layout ──────────────────────────────────────────────────────── */
@media (max-width: 700px) {

  /* App shell: canvas fills the whole screen */
  #app {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;
    height: 100dvh;
  }

  /* Canvas area fills everything; bottom padding reserves space for mobile bar */
  #canvas-area {
    grid-row: 1;
    height: 100dvh;
    padding-bottom: 64px;
  }

  /* Upload zone: full-screen centered card */
  #canvas-area #canvas-placeholder {
    padding: 2rem;
  }

  /* Sidebar becomes a bottom drawer */
  #sidebar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    top: auto;
    height: auto;
    max-height: 80dvh;
    border-right: none;
    border-top: 1px solid var(--pico-muted-border-color);
    border-radius: 18px 18px 0 0;
    box-shadow: 0 -4px 24px rgba(0,0,0,0.18);
    transform: translateY(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 200;
    overflow-y: auto;
    padding-bottom: max(1.25rem, env(safe-area-inset-bottom));
  }

  #sidebar.drawer-open {
    transform: translateY(0);
  }

  /* Drag handle at top of drawer */
  #sidebar::before {
    content: '';
    display: block;
    width: 36px;
    height: 4px;
    background: var(--pico-muted-border-color);
    border-radius: 2px;
    margin: 0.6rem auto 0.75rem;
  }

  /* Hide desktop-only sidebar elements */
  #sidebar header,
  #upload-zone,
  #help-text {
    display: none;
  }

  /* Upload zone on mobile: full canvas area */
  #canvas-area > #canvas-placeholder {
    text-align: center;
  }

  /* Status bar at TOP on mobile so it's not covered by bottom bar */
  #status-bar {
    top: 0;
    bottom: auto;
  }

  /* Backdrop overlay */
  #drawer-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.45);
    z-index: 199;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
  }

  #drawer-overlay.visible {
    opacity: 1;
    pointer-events: all;
  }

  /* Mobile bottom bar */
  #mobile-bar {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--pico-background-color);
    border-top: 1px solid var(--pico-muted-border-color);
    padding: 0.5rem 1rem;
    padding-bottom: max(0.65rem, env(safe-area-inset-bottom));
    gap: 0.5rem;
    align-items: center;
  }

  #mobile-bar .mode-btn {
    flex: 1;
    font-size: 0.82rem;
    padding: 0.5rem 0.25rem;
  }

  #mobile-cal-indicator {
    padding: 0 0.25rem;
    display: flex;
    align-items: center;
  }

  #btn-drawer-toggle {
    background: none;
    border: 1.5px solid var(--pico-muted-border-color);
    border-radius: 8px;
    padding: 0.4rem 0.6rem;
    cursor: pointer;
    color: var(--pico-color);
    display: flex;
    align-items: center;
    margin-left: auto;
  }

  /* Mobile upload zone inside canvas area */
  #canvas-area {
    position: relative;
  }

  #mobile-upload-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    height: 100%;
    padding: 2rem;
  }
}