/* ── Reset & base ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* key sizing */
  --ku: 3rem;
  --kh: 3rem;
  --kgap: 0.28rem;
  --kradius: 0.4rem;

  /* palette – light (default) */
  --bg:           #f0f0f0;
  --surface:      #ffffff;
  --surface-2:    #f7f7f7;
  --border:       #ddd;
  --text:         #1a1a1a;
  --text-muted:   #666;
  --accent:       #2d6be4;

  /* key colours */
  --key-bg:       #e4e4e4;
  --key-border:   #b0b0b0;
  --key-shadow:   #9a9a9a;
  --key-text:     #1a1a1a;
  --key-muted:    #888;

  /* status colours */
  --match-bg:     #d4edda;
  --match-border: #82c99a;
  --diff-bg:      #fff3cd;
  --diff-border:  #f0c040;
  --missing-bg:   #f8d7da;
  --missing-border:#e08090;

  --font: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

/* Auto dark: OS prefers dark and no explicit theme override */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:           #1a1a1a;
    --surface:      #252525;
    --surface-2:    #2e2e2e;
    --border:       #3a3a3a;
    --text:         #e8e8e8;
    --text-muted:   #888;
    --accent:       #5b8ef0;

    --key-bg:       #333333;
    --key-border:   #505050;
    --key-shadow:   #1a1a1a;
    --key-text:     #e8e8e8;
    --key-muted:    #666;

    --match-bg:     #1a3328;
    --match-border: #2d6648;
    --diff-bg:      #3a2e00;
    --diff-border:  #7a6000;
    --missing-bg:   #3a1a1e;
    --missing-border:#7a3040;
  }
}

/* Explicit dark override */
[data-theme="dark"] {
  --bg:           #1a1a1a;
  --surface:      #252525;
  --surface-2:    #2e2e2e;
  --border:       #3a3a3a;
  --text:         #e8e8e8;
  --text-muted:   #888;
  --accent:       #5b8ef0;

  --key-bg:       #333333;
  --key-border:   #505050;
  --key-shadow:   #1a1a1a;
  --key-text:     #e8e8e8;
  --key-muted:    #666;

  --match-bg:     #1a3328;
  --match-border: #2d6648;
  --diff-bg:      #3a2e00;
  --diff-border:  #7a6000;
  --missing-bg:   #3a1a1e;
  --missing-border:#7a3040;
}

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
  min-height: 100vh;
}

/* ── Header ───────────────────────────────────────────── */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.header-title {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  white-space: nowrap;
}

.header-apt  { color: var(--accent); }
.header-name { color: var(--text); }

.header-tagline {
  color: var(--text-muted);
  font-size: 0.85rem;
  flex: 1;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}

.theme-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.theme-select {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.35rem;
  padding: 0.3rem 0.55rem;
  font-size: 0.875rem;
  font-family: var(--font);
  cursor: pointer;
}

/* ── Main layout ──────────────────────────────────────── */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 1.25rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* ── Controls bar ─────────────────────────────────────── */
.controls-bar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  padding: 0.9rem 1.1rem;
  display: flex;
  align-items: flex-end;
  gap: 1rem;
  flex-wrap: wrap;
}

.controls-presets {
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.control-group label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.control-group select {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.35rem;
  padding: 0.35rem 0.6rem;
  font-size: 0.9rem;
  font-family: var(--font);
  cursor: pointer;
  min-width: 140px;
}

/* ── Buttons ──────────────────────────────────────────── */
.btn {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.35rem;
  padding: 0.38rem 0.8rem;
  font-size: 0.875rem;
  font-family: var(--font);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.12s, border-color 0.12s;
}

.btn:hover:not(:disabled) { background: var(--border); }

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-swap {
  font-size: 1.1rem;
  padding: 0.35rem 0.6rem;
  align-self: flex-end;
}

/* ── View bar (above keyboard) ────────────────────────── */
.view-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.view-select-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

.view-select-group label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.view-select-group select {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.35rem;
  padding: 0.3rem 0.55rem;
  font-size: 0.875rem;
  font-family: var(--font);
  cursor: pointer;
}

/* ── Status legend pills ──────────────────────────────── */
.status-legend {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 0.18rem 0.65rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
  border: 1.5px solid transparent;
}

.pill-match   { background: var(--match-bg);   border-color: var(--match-border);   }
.pill-diff    { background: var(--diff-bg);    border-color: var(--diff-border);    }
.pill-missing { background: var(--missing-bg); border-color: var(--missing-border); }
.pill-neutral { background: var(--key-bg);     border-color: var(--key-border);     color: var(--text-muted); }

/* ── Keyboard section ─────────────────────────────────── */
.keyboard-section {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.keyboard-scroll {
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.empty-state {
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: 0.6rem;
}

/* ── Keyboard ─────────────────────────────────────────── */
.keyboard {
  display: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1rem 1.1rem;
  width: fit-content;
}

.keyboard.visible {
  display: flex;
  flex-direction: column;
  gap: var(--kgap);
}

.kb-body {
  display: flex;
  gap: calc(var(--ku) * 0.6);
  align-items: flex-start;
}

.kb-main, .kb-nav {
  display: flex;
  flex-direction: column;
  gap: var(--kgap);
}

/* Extra gap below F-key row */
.kb-row--frow {
  margin-bottom: calc(var(--ku) * 0.25);
}

.kb-row {
  display: flex;
  gap: var(--kgap);
  align-items: stretch;
}

/* ── Key ──────────────────────────────────────────────── */
.key {
  flex: 0 0 auto;
  height: var(--kh);
  background: var(--key-bg);
  border: 1.5px solid var(--key-border);
  border-radius: var(--kradius);
  box-shadow: 0 2px 0 var(--key-shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.1rem 0.3rem;
  cursor: default;
  user-select: none;
  position: relative;
  transition: background 0.1s, border-color 0.1s;
}

/* Tooltip shown on hover for keys with data-tooltip */
.key[data-tooltip]:hover::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 5px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 0.2rem 0.5rem;
  border-radius: 0.3rem;
  font-size: 0.78rem;
  font-family: var(--mono);
  white-space: nowrap;
  pointer-events: none;
  z-index: 100;
}

.key-spacer {
  flex: 0 0 auto;
  height: var(--kh);
  background: transparent;
  border: none;
  box-shadow: none;
}

.key.key-fixed .key-legend {
  color: var(--key-muted);
  font-size: 0.65rem;
}

.key.key-match   { background: var(--match-bg);   border-color: var(--match-border);   }
.key.key-diff    { background: var(--diff-bg);    border-color: var(--diff-border);    }
.key.key-missing { background: var(--missing-bg); border-color: var(--missing-border); }

/* Modifier keys are clickable — show pointer and subtle hover */
.key.key-modifier { cursor: pointer; }
.key.key-modifier:hover:not(.key-modifier-active) {
  background: var(--border);
}

/* Active modifier key — blue accent background, white text */
.key.key-modifier-active {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.45);
}
.key.key-modifier-active .key-legend {
  color: #fff;
}

.key-legend {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--key-text);
  text-align: center;
  line-height: 1.1;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.key-code-hint {
  font-size: 0.5rem;
  color: var(--key-muted);
  letter-spacing: 0.02em;
  opacity: 0.7;
}

/* Dual view: two stacked labels */
.key-dual-top,
.key-dual-bot {
  font-size: 0.7rem;
  font-weight: 600;
  line-height: 1.1;
  text-align: center;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  width: 100%;
}

.key-dual-top {
  color: #4070d0;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.1rem;
  margin-bottom: 0.1rem;
}

.key-dual-bot { color: #c05020; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .key-dual-top { color: #7aacf0; }
  :root:not([data-theme="light"]) .key-dual-bot { color: #f07050; }
}
[data-theme="dark"] .key-dual-top { color: #7aacf0; }
[data-theme="dark"] .key-dual-bot { color: #f07050; }

/* ISO Enter top cap */
.key.key-iso-enter-top {
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
  border-bottom-color: transparent;
  opacity: 0.55;
  justify-content: flex-start;
  padding-top: 0.35rem;
}
.key.key-iso-enter-top::after {
  content: '↵';
  font-size: 0.65rem;
  color: var(--key-muted);
}

/* Space bar */
.key[title="SPCE"] .key-legend { display: none; }

/* ── Layout panels (below keyboard) ───────────────────── */
.layout-panels {
  display: flex;
  gap: 1rem;
}

.layout-panel {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.layout-panel-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.layout-panel-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex: 1;
}

.layout-panel-actions {
  display: flex;
  gap: 0.4rem;
}

.dot {
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

.dot-physical  { background: #5b8ef0; }
.dot-software  { background: #e07040; }

textarea {
  width: 100%;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  padding: 0.6rem 0.75rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.6;
  resize: vertical;
  tab-size: 4;
}

textarea:focus {
  outline: none;
  border-color: var(--accent);
}

textarea[readonly] {
  background: var(--surface-2);
  color: var(--text-muted);
  cursor: default;
}

/* ── Load layout dialog ────────────────────────────────── */
dialog {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  max-width: 360px;
  width: 90%;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.25);
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.45);
}

.dialog-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text);
}

.layout-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-bottom: 1rem;
  max-height: 55vh;
  overflow-y: auto;
}

.layout-list-btn {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.45rem 0.75rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 0.35rem;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.1s, color 0.1s, border-color 0.1s;
}

.layout-list-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.dialog-footer {
  display: flex;
  justify-content: flex-end;
}

/* ── Footer ───────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 1rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 700px) {
  .controls-bar    { flex-direction: column; align-items: flex-start; }
  .controls-presets { flex-direction: column; align-items: flex-start; }
  .layout-panels   { flex-direction: column; }
  .view-bar        { flex-direction: column; align-items: flex-start; }
  :root { --ku: 2.5rem; --kh: 2.5rem; }
}