:root {
  /* Colors (from restyle design tokens) */
  --primary: #006b58;
  --primary-container: #1abc9c;
  --on-primary: #ffffff;
  --on-primary-container: #004538;
  --secondary: #4e6073;
  --on-secondary: #ffffff;
  --on-secondary-container: #526478;
  --background: #f7f9fb;
  --surface: #f7f9fb;
  --surface-container-lowest: #ffffff;
  --surface-container-low: #f2f4f6;
  --surface-container: #eceef0;
  --surface-container-high: #e6e8ea;
  --surface-container-highest: #e0e3e5;
  --on-surface: #191c1e;
  --on-surface-variant: #3c4a45;
  --on-background: #191c1e;
  --text-muted: #64748b;
  --border-subtle: #e2e8f0;
  --outline: #6c7a75;
  --outline-variant: #bbcac3;
  --editor-bg: #1e1e1e;
  --error: #ba1a1a;

  /* Radii */
  --radius: 0.125rem;
  --radius-lg: 0.25rem;
  --radius-xl: 0.5rem;
  --radius-full: 0.75rem;

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  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 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topnav-left {
  display: flex;
  align-items: center;
  gap: 32px;
}

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

.topnav-links {
  display: flex;
  gap: 24px;
}

.topnav-links a {
  color: var(--secondary);
  font-weight: 500;
  font-size: 14px;
}

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

.topnav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.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: sidebar + main ---- */

.layout {
  display: flex;
  gap: 32px;
  max-width: 1200px;
  margin: auto;
  padding: 32px 24px 64px;
  align-items: flex-start;
}

.sidebar {
  position: sticky;
  top: 96px;
  flex: 0 0 220px;
  width: 220px;
  background: var(--surface-container-low);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 24px 0;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--secondary);
  border-right: 3px solid transparent;
}

.sidebar-link:hover {
  background: var(--surface-container-high);
  text-decoration: none;
}

.sidebar-link.active {
  color: var(--primary);
  font-weight: 700;
  background: rgba(26, 188, 156, 0.1);
  border-right-color: var(--primary);
}

.sidebar-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 4px;
  background: var(--surface-container-high);
  color: var(--secondary);
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}

.sidebar-link.active .sidebar-num {
  background: var(--primary);
  color: var(--on-primary);
}

.wrapper {
  display: flex;
  flex-direction: column;
  gap: 24px;
  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: 32px;
  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-subtle);
  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-subtle);
  z-index: 1;
}

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

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

h1 {
  font-size: 30px;
  line-height: 38px;
  letter-spacing: -0.02em;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 8px;
}

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 12px;
}

p {
  margin: 16px 0;
  color: var(--on-surface-variant);
}

a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

a:hover {
  text-decoration: underline;
}

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-subtle);
  border-radius: var(--radius-xl);
  padding: 32px;
}

/* First (intro) section: keep it flush/light */
.section:first-child {
  background: transparent;
  border: none;
  padding: 8px 0 0;
}

.section h2 {
  margin-bottom: 16px;
}

/* Legacy divider no longer needed; cards separate content */
.bottom-divider {
  border-bottom: none;
  padding-bottom: 32px;
}

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

.section {
  width: 100%;
}

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

.column {
  float: left;
}

.column-center {
  min-width: 120px;
  text-align: center;
  color: var(--text-muted);
}

.column-right {
  float: right;
}

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

.table {
  display: table;
  margin: 8px 0 0;
  width: 100%;
  border-collapse: collapse;
}

.table-row {
  display: table-row;
  width: 100%;
}

.table-cell {
  display: table-cell;
  padding: 10px 0;
  vertical-align: top;
}

.table-cell:first-child {
  width: 30%;
  padding-right: 16px;
}

.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: 10px;
  color: var(--on-surface-variant);
  font-size: 14px;
}

.nested-table {
  margin: 0;
}

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

#format-caption-container div {
  color: var(--text-muted);
  display: none;
  font-size: 14px;
  line-height: 1.5em;
  padding: 10px 0 15px;
  width: 100%;
}

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

.note {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.5em;
  margin: 4px 0;
}

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

.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: 14px;
  color: var(--on-surface-variant);
  background: var(--surface-container);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  padding: 8px 10px;
  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 rgba(0, 107, 88, 0.25);
}

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: 14px;
  line-height: 22px;
  resize: vertical;
}

.text-input-size {
  margin: 8px 0;
  color: var(--on-surface-variant);
  font-size: 14px;
}

.size-input {
  width: 72px;
}

.glyph-input {
  width: 80px;
  margin-left: 10px;
}

.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: 10px 8px 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: 14px;
  padding: 16px 20px;
  margin: 10px 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: 12px;
  cursor: pointer;
}

.generate-button {
  background: var(--primary);
  color: var(--on-primary);
  margin: 32px 8px 20px 0;
  padding: 10px 20px;
}

#copy-button,
#download-button {
  background: var(--secondary);
  color: var(--on-secondary);
  margin-top: 32px;
}

.remove-button {
  margin: 0 0 0 10px;
  padding: 2px 8px;
  background: var(--surface-container-high);
  color: var(--on-surface-variant);
}

/* ---- File info / size list ---- */

.file-input-entry {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
}

.file-info {
  color: var(--text-muted);
  font-size: 12px;
  margin-left: 20px;
  max-width: 320px;
  white-space: pre;
}

.file-name {
  display: block;
  margin-left: 0;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--on-surface-variant);
}

/* 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 {
  margin: 6px 0;
}

/* ---- 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(--editor-bg);
  margin: 10px 15px 10px 0;
  padding: 4px;
}

.inlineImg {
  border-radius: var(--radius-lg);
  margin-top: 8px;
}

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

.code-output {
  height: 400px;
  width: 100%;
  margin-top: 16px;
  background: var(--editor-bg);
  color: #dcdcaa;
  border: 1px solid var(--on-surface-variant);
  border-radius: var(--radius-xl);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 22px;
  padding: 20px;
  resize: vertical;
}

.code-output:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(0, 107, 88, 0.25);
}

/* ---- 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: 12px;
}

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

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

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

  .sidebar {
    position: static;
    width: 100%;
    flex: none;
  }

  .sidebar-nav {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .sidebar-link {
    border-right: none;
    border-radius: var(--radius-lg);
  }

  .sidebar-link.active {
    border-right: none;
  }
}

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

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

  .step-num {
    position: static;
    margin-bottom: 16px;
  }

  .step::before {
    display: none;
  }

  .column,
  .column-right {
    float: none;
    width: 100%;
  }

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

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

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

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

:root[data-theme="dark"] {
  --primary: #4eddbb;
  --primary-container: #1abc9c;
  --on-primary: #003a2e;
  --on-primary-container: #e5fff7;
  --secondary: #b5c8df;
  --on-secondary: #17293b;
  --on-secondary-container: #cfe2f9;
  --background: #0f1416;
  --surface: #0f1416;
  --surface-container-lowest: #171d1f;
  --surface-container-low: #1a2124;
  --surface-container: #22282b;
  --surface-container-high: #2a3033;
  --surface-container-highest: #343a3d;
  --on-surface: #e0e3e5;
  --on-surface-variant: #c3d0c9;
  --on-background: #e0e3e5;
  --text-muted: #8a9a94;
  --border-subtle: #2d3133;
  --outline: #8a938f;
  --outline-variant: #414a47;
  --editor-bg: #0b0e0f;
}

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

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

:root[data-theme="dark"] .sidebar-link.active {
  background: rgba(26, 188, 156, 0.18);
}