:root {
  /* Colors (from restyle design tokens) */
  --primary: #006b58;
  --primary-container: #1abc9c;
  --on-primary: #ffffff;
  --on-primary-container: #e5fff7;
  --secondary: #4e6073;
  --on-secondary: #ffffff;
  --background: #f7f9fb;
  --surface-container-lowest: #ffffff;
  --surface-container-low: #f2f4f6;
  --surface-container: #eceef0;
  --surface-container-high: #e6e8ea;
  /* --on-surface: #191c1e; */
  --on-surface: #000000;
  /* --on-surface-variant: #3c4a45; */
  --on-surface-variant: #000000;
  /* --on-background: #191c1e; */
  --on-background: #000000;
  --text-muted: #64748b;
  --border-subtle: #e2e8f0;
  --border-hard: #1abc9c;
  --outline-variant: #bbcac3;
  --editor-bg: #ffffff;
  --error: #ba1a1a;
  --focus-ring: rgba(0, 107, 88, 0.25);

  /* Radii */
  --radius-lg: 0.25rem;
  --radius-xl: 0.5rem;

  /* Spacing scale (use these for margin/padding/gap instead of magic numbers) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 32px;
  --space-8: 48px;
  --space-9: 64px;

  /* Fonts */
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-size: 14px;
}

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

body {
  font-family: var(--font-body);
  font-size: var(--font-size);
  line-height: 24px;
  color: var(--on-background);
  background-color: var(--background);
  min-height: 100vh;
}

/* ---- Top nav bar ---- */

.topnav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--surface-container-lowest);
  border-bottom: 1px solid var(--border-subtle);
}

.topnav-inner {
  max-width: 1200px;
  margin: auto;
  height: 64px;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topnav-left {
  display: flex;
  align-items: center;
  gap: var(--space-7);
}

.brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
}

.topnav-links {
  display: flex;
  gap: var(--space-6);
}

.topnav-links a {
  color: var(--secondary);
  font-weight: 500;
  font-size: var(--font-size);
  text-decoration: underline;
}

.topnav-links a:hover {
  color: var(--primary);
  text-decoration: none;
}

.topnav-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.icon-btn {
  background: transparent;
  color: var(--secondary);
  border: none;
  font-size: 18px;
  line-height: 1;
  padding: 6px;
  margin: 0;
  border-radius: var(--radius-lg);
  cursor: pointer;
}

.icon-btn:hover {
  color: var(--primary);
  background: var(--surface-container);
  opacity: 1;
}

.theme-icon-light {
  display: none;
}

.btn-reset {
  margin: 0;
}

/* ---- Layout: main ---- */

.layout {
  display: flex;
  gap: var(--space-7);
  max-width: 1200px;
  margin: auto;
  /* padding: var(--space-7) var(--space-6) var(--space-9); */
  padding: 0 var(--space-6) var(--space-9);
  align-items: flex-start;
}

.wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  flex: 1;
  min-width: 0;
}

/* ---- Step number rail ---- */

.section.step {
  position: relative;
  padding-left: 72px;
  scroll-margin-top: 88px;
}


.step-num {
  position: absolute;
  left: 16px;
  top: var(--space-4);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  background: var(--surface-container-high);
  color: var(--secondary);
  border: 1px solid var(--border-hard);
  z-index: 2;
}

.active .step-num {
  background: var(--primary);
  color: var(--on-primary);
  border-color: var(--primary);
}

.step::before {
  content: "";
  position: absolute;
  left: 35px;
  top: 40px;
  bottom: -24px;
  width: 2px;
  background: var(--border-hard);
  z-index: 1;
}

#step-0.step::before, #step-4.step::before {
  display: none;
}

/* step-3 (Preview) lives as a pinned side panel next to Settings, not
   inline in the vertical step flow, so it doesn't carry a connecting rail */
#step-3.step::before {
  display: none;
}

/* ---- Typography ---- */

h1 {
  font-size: 30px;
  line-height: 38px;
  letter-spacing: -0.02em;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: var(--space-2);
}

.v2 {
  font-size: 18px;
  line-height: 22px;
  font-weight: 500;
  color: var(--secondary);
}

h2 {
  font-size: 20px;
  line-height: 28px;
  font-weight: 600;
  color: var(--on-surface);
}

.sub-section-title {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 16px;
  font-weight: 500;
  color: var(--primary);
  margin: 0 0 var(--space-3);
}

p {
  margin: var(--space-4) 0;
  color: var(--on-surface-variant);
}

a {
  color: var(--primary);
  text-decoration: underline;
  font-weight: 500;
}

a:hover {
  text-decoration: none;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--surface-container);
  padding: 1px 5px;
  border-radius: var(--radius-lg);
}

/* ---- Section cards ---- */

.section {
  background: var(--surface-container-lowest);
  border: 1px solid var(--border-hard);
  border-radius: var(--radius-xl);
  padding: var(--space-2);
}

/* First (intro) section: keep it flush/light */
.section.first-step {
  background: transparent;
  border: none;
  /* padding: var(--space-5) 0 0; */
  /* border: 10px solid red; */
  padding: 0;
}

.section.first-step p {
  margin-top: 0;
  padding-top: 0;
}

.section h2 {
  margin-bottom: var(--space-1);
}

/* Legacy divider no longer needed; cards separate content */
/* .bottom-divider { */
  /* border-bottom: none; */
  /* padding-bottom: var(--space-7); */
/* } */

.sub-section {
  clear: both;
  width: 100%;
}

.section {
  width: 100%;
}

/* ---- Settings + live preview layout (step 2 + step 3) ----
   Preview sits pinned next to Settings so the effect of dithering /
   threshold / invert etc is visible without scrolling away from the
   controls that change it. */

.settings-preview-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-6);
}

.settings-preview-row #step-2 {
  flex: 1 1 auto;
  min-width: 0;
}

.settings-preview-row #step-3 {
  flex: 0 0 300px;
  width: 300px;
  position: sticky;
  top: 96px;
}

/* ---- Multi-column (select image row) ---- */

.input-methods-row {
  display: flex;
  align-items: space-between;
  gap: var(--space-5);
}

.input-methods-row .column-left {
  width: 50%;
}
.input-methods-row .column-right {
  width: 50%;
}

.column-left {
  border-right: 1px solid var(--border-subtle);
  padding-right: var(--space-3);
}

.column-right {
  border-right: none;
}

/* ---- Table layout for settings ---- */

.table {
  display: table;
  /* margin: var(--space-2) 0 0; */
  width: 100%;
  border-collapse: collapse;
}

.table-row {
  display: table-row;
  width: 100%;
  border-bottom: 1px solid var(--border-subtle);
}

.table-cell {
  display: table-cell;
  padding: var(--space-2) 0;
  vertical-align: top;
}

.table-cell:first-child {
  width: 20%;
  padding-right: var(--space-4);
}

.table-cell:last-child {
  width: 70%;
}

.table-cell:first-child > label {
  font-family: var(--font-mono);
  font-size: 13px;
  /* font-weight: 500; */
  color: var(--primary);
}

.table-cell:last-child > label {
  margin-right: var(--space-2);
  color: var(--on-surface-variant);
  font-size: var(--font-size);
}

.nested-table {
  margin: 0;
}

/* ---- Settings rows (step 2) ----
   Single-column label-left / value-right rows, hairline-divided. Denser
   than the old 2-up grid, and keeps each setting's note attached under
   its label instead of floating below the control in the value column. */

.settings-grid {
  display: block;
  margin: var(--space-2) 0 0;
}

.settings-grid .table-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-6);
  padding: var(--space-1) 0;
  border-top: 1px solid var(--border-subtle);
}

.settings-grid .table-row:first-child {
  border-top: none;
  padding-top: 0;
}

.settings-grid .table-cell {
  padding: 0;
}

.settings-grid .table-cell:first-child {
  width: 250px;
  flex-shrink: 0;
}

.settings-grid .table-cell:last-child {
  width: auto;
  flex: 1;
  min-width: 0;
}

.settings-grid .table-cell:first-child .note {
  font-size: 13px;
  line-height: 1.45em;
  margin: var(--space-1) 0 0;
}

.nested-table .table-cell {
  color: var(--text-muted);
  font-size: 0.9em;
  /* width: 200px; */
}

/* #format-caption-container { */
  /* Reserve space for the longest caption so switching output format
     doesn't shift the fields/buttons below it. */
  /* min-height: 100px; */
/* } */

#extra-settings-container {
  /* Reserve space for the tallest combination (Adafruit GFX shows both its
     own fields and the Arduino identifier fields) so the Generate/Copy/
     Download buttons don't jump around when switching output format. */
  /* min-height: 278px; */
  transition: min-height 0.15s ease;
}

#format-caption-container div {
  color: var(--text-muted);
  display: none;
  font-size: var(--font-size);
  line-height: 1.5em;
  padding: var(--space-2) 0 var(--space-4);
  width: 100%;
}

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

.note {
  color: var(--text-muted);
  font-size: var(--font-size);
  line-height: 1.5em;
  margin: var(--space-1) 0;
  font-style: italic;
}

#glyph-name-note {
  display: none;
}

/* .upload-note {
  max-width: 320px;
} */

#continue-note {
  display: none;
  margin-top: var(--space-7);
}

.msg {
  font-size: 16px;
  color: var(--text-muted);
}

.error-msg {
  color: var(--error);
  display: none;
}

/* ---- Form controls ---- */

input[type="text"],
input[type="number"],
textarea,
select {
  font-family: var(--font-body);
  font-size: var(--font-size);
  color: var(--on-surface-variant);
  background: var(--surface-container);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  padding: 4px 4px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input[type="text"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--focus-ring);
}

select {
  cursor: pointer;
}

input[type="checkbox"],
input[type="radio"] {
  accent-color: var(--primary);
  width: 16px;
  height: 16px;
  vertical-align: middle;
  cursor: pointer;
}

.byte-input {
  min-height: 160px;
  min-width: 360px;
  width: 100%;
  font-family: var(--font-mono);
  font-size: var(--font-size);
  line-height: 22px;
  resize: vertical;
}
#text-input-error {
  color: var(--error);
  font-size: var(--font-size);
  margin-top: var(--space-2);
  display: none;
}

.text-input-preview-canvas {
  display: none;
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  /* background: var(--primary-container); */
  margin: var(--space-2) 0;
  /* padding: 4px; */
  max-width: 100%;
}

#read-images-note {
  display: none;
}

.text-input-size {
  margin: var(--space-2) 0;
  color: var(--on-surface-variant);
  font-size: var(--font-size);
}

.size-input {
  width: 72px;
}

.sub-field {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.sub-field:first-child {
  margin-top: 0;
}

.sub-field-label {
  min-width: 200px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--primary);
}

.glyph-input {
  width: 300px;
  margin-left: var(--space-2);
}

.text-input {
  font-family: var(--font-mono);
}

/* ---- Buttons ---- */

button {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  background: var(--primary-container);
  color: var(--on-primary-container);
  border: none;
  border-radius: var(--radius-lg);
  padding: 8px 16px;
  margin: var(--space-2) var(--space-2) 0 0;
  cursor: pointer;
  transition: opacity 0.15s ease, background-color 0.15s ease;
}

button:hover {
  opacity: 0.9;
}

button:active {
  opacity: 0.8;
}

input[type="file"] {
  background: var(--surface-container);
  color: var(--on-surface-variant);
  /* border: 2px dashed var(--outline-variant); */
  border-radius: var(--radius-lg);
  font-size: var(--font-size);
  padding: 4px 4px;
  margin: var(--space-2) 0 0;
  cursor: pointer;
  width: 100%;
  max-width: 360px;
}

input[type="file"]:hover {
  background: var(--surface-container-high);
}

input[type="file"]::file-selector-button {
  font-family: var(--font-mono);
  font-weight: 500;
  background: var(--primary-container);
  color: var(--on-primary-container);
  border: none;
  border-radius: var(--radius-lg);
  padding: 6px 12px;
  margin-right: var(--space-3);
  cursor: pointer;
}

.generate-button {
  background: var(--primary);
  color: var(--on-primary);
  padding: 10px 20px;
}

#copy-button,
#download-button {
  background: var(--secondary);
  color: var(--on-secondary);
}

/* Same margin rhythm across all three action buttons so the gap above
   them and before the code output box is consistent regardless of which
   buttons happen to be in view. */
.generate-button,
#copy-button,
#download-button {
  margin: var(--space-7) var(--space-2) var(--space-6) 0;
}

.remove-button {
  margin: 0 0 0 var(--space-2);
  padding: 2px 8px;
  /* background: var(--surface-container-high); */
  /* color: var(--on-surface-variant); */
}

#no-images-error {
  margin-bottom: var(--space-2);
}
/* ---- File info / size list ---- */

.file-input-entry {
  border: 1px solid var(--border-subtle);
  padding: var(--space-1);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: var(--space-2) 0;
}

.file-input-entry span {
  flex: 1;
  min-width: 0;
}

.file-info {
  color: var(--text-muted);
  font-size: 12px;
}

.file-name {
  flex: 1;
  min-width: 0;
  margin: 0;
  font-weight: 500;
  color: var(--on-surface-variant);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Tighten gap between a row and the explanatory note row that follows */
.note-row .table-cell {
  padding-top: 0;
}

#image-size-settings {
  list-style-type: none;
}

#image-size-settings li {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin: var(--space-2) 0;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-2) var(--space-3);
}

.image-size-thumb-container {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.image-size-thumb {
  width: auto;
  height: auto;
  max-width: 48px;
  max-height: 48px;
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-md, 4px);
  background: var(--surface-variant, #fff);
  flex-shrink: 0;
  vertical-align: middle;
}

.image-size-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.image-size-header {
  justify-content: space-between;
}

/* ---- Preview canvases ---- */

#images-canvas-container {
  align-items: flex-start;
  display: flex;
  flex-wrap: wrap;
}

#images-canvas-container canvas {
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  /* background: var(--primary-container); */
  margin: var(--space-2) var(--space-4) var(--space-2) 0;
  max-width: 100%;
  /* Display width/height/aspect-ratio are set in JS (setCanvasDisplaySize)
     so small glyphs get enlarged without distorting their aspect ratio;
     independent min-width/min-height here would stretch non-square canvases. */
  image-rendering: crisp-edges;
  image-rendering: pixelated;
}

.inlineImg {
  border-radius: var(--radius-lg);
  margin-top: var(--space-2);
}

/* ---- Code output (dark editor look) ---- */

.code-output {
  height: 400px;
  width: 100%;
  /* margin-top: 16px; */
  background: var(--editor-bg);
  color: var(--on-surface);
  border: 1px solid var(--on-surface-variant);
  border-radius: var(--radius-xl);
  font-family: var(--font-mono);
  font-size: var(--font-size);
  line-height: 22px;
  padding: 20px;
  resize: vertical;
}

.code-output:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--focus-ring);
}

/* ---- Hidden by default (toggled via JS) ---- */

#arduino-identifier,
#adafruit-gfx-settings,
#all-same-size {
  display: none;
}

/* ---- Sponsor block ---- */

.sp-block {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.sp-block img {
  vertical-align: middle;
}

/* ---- Responsive ---- */

@media (max-width: 900px) {
  .layout {
    flex-direction: column;
  }

  .settings-preview-row {
    flex-direction: column;
  }

  .settings-preview-row #step-3 {
    position: static;
    width: 100%;
    flex: none;
  }
}

@media (max-width: 640px) {
  .topnav-links {
    display: none;
  }

  .section.step {
    padding-left: 32px;
  }

  .step-num {
    position: static;
    margin-bottom: var(--space-4);
  }

  .step::before {
    display: none;
  }

  .input-methods-row {
    flex-direction: column;
  }

  .column-left,
  .column-right {
    width: 100%;
    margin-left: 0;
  }

  .byte-input {
    min-width: 0;
  }

  .table-cell:first-child,
  .table-cell:last-child {
    display: block;
    width: 100%;
  }

  .table-cell:first-child {
    padding-bottom: 0;
  }

  .settings-grid .table-row {
    flex-direction: column;
    gap: var(--space-1);
  }
}

/* ---- Dark theme ---- */

:root[data-theme="dark"] {
  --primary: #4eddbb;
  --primary-container: #1abc9c;
  --on-primary: #003a2e;
  --on-primary-container: #e5fff7;
  --secondary: #b5c8df;
  --on-secondary: #17293b;
  --background: #0f1416;
  --surface-container-lowest: #171d1f;
  --surface-container-low: #1a2124;
  --surface-container: #22282b;
  --surface-container-high: #2a3033;
  --on-surface: #e0e3e5;
  --on-surface-variant: #c3d0c9;
  --on-background: #e0e3e5;
  --text-muted: #8a9a94;
  --border-subtle: #2d3133;
  --outline-variant: #414a47;
  --editor-bg: #0b0e0f;
  --focus-ring: rgba(78, 221, 187, 0.35);
}

:root[data-theme="dark"] .theme-icon-dark {
  display: none;
}

:root[data-theme="dark"] .theme-icon-light {
  display: inline;
}