:root {
  color-scheme: dark;
  --bg: #071018;
  --bg-elevated: #101b27;
  --bg-panel: #121f2d;
  --bg-soft: #182636;
  --text: #edf6f7;
  --text-muted: #a9bac2;
  --border: #284050;
  --accent: #5dbdb3;
  --accent-strong: #8ee6dc;
  --danger: #ff7d8b;
  --danger-bg: #3a1720;
  --warning: #ffd166;
  --warning-bg: #312817;
  --success: #89e894;
  --shadow: 0 20px 70px rgba(0, 0, 0, 0.35);
  --radius: 18px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f8fb;
  --bg-elevated: #ffffff;
  --bg-panel: #ffffff;
  --bg-soft: #edf4f7;
  --text: #12202a;
  --text-muted: #526776;
  --border: #ccdae2;
  --accent: #147b78;
  --accent-strong: #0f5f5c;
  --danger: #b4233b;
  --danger-bg: #ffe6eb;
  --warning: #8a5a00;
  --warning-bg: #fff4cf;
  --success: #176b2c;
  --shadow: 0 18px 45px rgba(35, 57, 70, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--bg);
}

body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  color: var(--text);
  background:
    radial-gradient(circle at top left, color-mix(in srgb, var(--accent) 24%, transparent), transparent 34rem),
    var(--bg);
  font-family: var(--sans);
  line-height: 1.5;
}

a {
  color: var(--accent-strong);
}

code,
pre,
input,
select,
button {
  font: inherit;
}

code,
pre {
  font-family: var(--mono);
}

button,
input,
select {
  border: 1px solid var(--border);
}

button,
select,
input[type="color"] {
  cursor: pointer;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
pre:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 72%, white);
  outline-offset: 3px;
}

.site-header,
.site-footer,
.app-shell {
  width: min(1280px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  padding-top: clamp(1.25rem, 4vw, 3rem);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
}

.hero-copy {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 0.35rem;
  color: var(--accent-strong);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0.6rem;
  font-size: clamp(2.25rem, 8vw, 5.5rem);
  line-height: 0.9;
  letter-spacing: -0.07em;
}

h2 {
  margin-bottom: 0.2rem;
  font-size: clamp(1.35rem, 3vw, 2rem);
}

h3 {
  margin-bottom: 0.35rem;
  font-size: 1rem;
}

.lede {
  color: var(--text-muted);
  font-size: clamp(1rem, 2vw, 1.18rem);
}

.header-actions,
.toolbar,
.row-actions,
.block-actions,
.field-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.button,
.icon-button {
  min-height: 2.55rem;
  padding: 0.65rem 0.9rem;
  border-radius: 999px;
  color: #061113;
  background: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 72%, black);
  font-weight: 800;
  text-decoration: none;
  transition: transform 140ms ease, background 140ms ease, border-color 140ms ease;
}

.button:hover,
.icon-button:hover {
  transform: translateY(-1px);
  background: var(--accent-strong);
}

.button.secondary,
.button.subtle,
.icon-button {
  color: var(--text);
  background: var(--bg-soft);
  border-color: var(--border);
}

.button.secondary:hover,
.button.subtle:hover,
.icon-button:hover {
  background: color-mix(in srgb, var(--bg-soft) 76%, var(--accent));
}

.button.danger {
  color: var(--text);
  background: var(--danger-bg);
  border-color: color-mix(in srgb, var(--danger) 55%, var(--border));
}

.button:disabled,
.icon-button:disabled {
  cursor: not-allowed;
  opacity: 0.58;
  transform: none;
}

.icon-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.icon {
  width: 1.12rem;
  height: 1.12rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

[data-theme="dark"] .icon-moon,
[data-theme="light"] .icon-sun {
  display: none;
}

.app-shell {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.panel {
  padding: clamp(1rem, 2.5vw, 1.6rem);
  background: color-mix(in srgb, var(--bg-panel) 94%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.hint,
.status-line {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.status-line {
  min-height: 1.4em;
  margin: 0.35rem 0 0.75rem;
}

.messages {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
}

.message {
  padding: 0.75rem 0.9rem;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
}

.message.error {
  color: var(--danger);
  background: var(--danger-bg);
  border-color: color-mix(in srgb, var(--danger) 42%, var(--border));
}

.message.warning {
  color: var(--warning);
  background: var(--warning-bg);
  border-color: color-mix(in srgb, var(--warning) 42%, var(--border));
}

.message.success {
  color: var(--success);
}

.rows-stack {
  display: grid;
  gap: 1rem;
}

.empty-state {
  padding: 1rem;
  color: var(--text-muted);
  border: 1px dashed var(--border);
  border-radius: 14px;
  background: var(--bg-soft);
}

.builder-row {
  padding: 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 16px;
}

.row-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 0.9rem;
}

.row-title {
  margin: 0;
}

.field,
.inline-field {
  display: grid;
  gap: 0.3rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 700;
}

.inline-field {
  grid-template-columns: auto auto;
  align-items: center;
}

.field input[type="text"],
.field select,
.inline-field input,
.hex-input {
  min-height: 2.35rem;
  padding: 0.48rem 0.65rem;
  color: var(--text);
  background: var(--bg-soft);
  border-radius: 10px;
}

.field select {
  min-width: min(18rem, 100%);
}

.font-field {
  min-width: min(18rem, 100%);
}

.font-combobox {
  position: relative;
  display: grid;
  gap: 0.35rem;
  min-width: min(18rem, 100%);
}

.font-tag-controls {
  display: grid;
  gap: 0.35rem;
}

.font-tag-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 2rem;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 0.05rem;
  scrollbar-width: thin;
}

.font-tag-chip {
  flex: 0 0 auto;
  min-height: 1.8rem;
  padding: 0.28rem 0.58rem;
  color: var(--text-muted);
  background: color-mix(in srgb, var(--bg-soft) 86%, transparent);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 800;
  line-height: 1;
  text-transform: capitalize;
  transition: background 140ms ease, border-color 140ms ease, color 140ms ease;
}

.font-tag-chip:hover,
.font-tag-chip.active {
  color: #061113;
  background: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 76%, black);
}

.font-tag-more {
  color: var(--text);
  background: var(--bg-panel);
}

.font-tag-panel {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  max-height: 8.5rem;
  overflow-y: auto;
  padding: 0.55rem;
  color: var(--text);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.font-tag-panel-chip {
  text-transform: capitalize;
}

.font-tag-empty {
  align-self: center;
  color: var(--text-muted);
  font-size: 0.76rem;
  font-weight: 700;
}

.font-combobox-input {
  width: 100%;
}

.font-listbox {
  position: absolute;
  z-index: 20;
  top: calc(100% + 0.25rem);
  left: 0;
  width: max-content;
  min-width: 100%;
  max-width: min(500px, calc(100vw - 2rem));
  max-height: 18rem;
  overflow-y: auto;
  padding: 0.35rem;
  color: var(--text);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.font-listbox[hidden] {
  display: none;
}

.font-option {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.45rem 0.55rem;
  border-radius: 9px;
  cursor: pointer;
  color: var(--text);
}

.font-option-name {
  flex: 1 1 auto;
  min-width: 7rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.font-option-tags {
  display: flex;
  flex: 0 1 auto;
  flex-wrap: wrap;
  gap: 0.25rem;
  justify-content: flex-end;
}

.font-option-tags:empty {
  display: none;
}

.font-option-tag {
  padding: 0.1rem 0.35rem;
  color: var(--text-muted);
  background: color-mix(in srgb, var(--bg-soft) 78%, transparent);
  border: 1px solid color-mix(in srgb, var(--border) 72%, transparent);
  border-radius: 999px;
  font-size: 0.65rem;
  font-weight: 800;
  line-height: 1.15;
  text-transform: capitalize;
  white-space: nowrap;
}

.font-option-status {
  flex: 0 0 auto;
  margin-left: auto;
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.font-option.failed .font-option-status {
  color: var(--danger);
}

.font-option.unloaded:not(.loaded) {
  opacity: 0.58;
}

.font-option.highlighted,
.font-option:hover {
  background: color-mix(in srgb, var(--bg-soft) 72%, var(--accent));
  opacity: 1;
}

.font-option.empty {
  cursor: default;
  color: var(--text-muted);
  opacity: 1;
}

input[type="color"] {
  width: 3.25rem;
  min-height: 2.35rem;
  padding: 0.18rem;
  background: var(--bg-soft);
  border-radius: 10px;
}

.blocks-stack {
  display: grid;
  gap: 0.75rem;
}

.block-card {
  display: grid;
  grid-template-columns: minmax(12rem, 1fr) auto minmax(8rem, 11rem) auto;
  gap: 0.75rem;
  align-items: end;
  padding: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: color-mix(in srgb, var(--bg-soft) 84%, transparent);
}

.hex-input.invalid {
  color: var(--danger);
  border-color: var(--danger);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--danger) 22%, transparent);
}

.ascii-preview,
.export-output {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #0b1020;
  color: #edf6f7;
  font-family: var(--mono);
  font-size: clamp(0.74rem, 1.5vw, 0.92rem);
  line-height: 1.1;
  white-space: pre;
}

.ascii-preview {
  min-height: 13rem;
  padding: 1rem;
}

.preview-line {
  min-height: 1.1em;
}

.export-output {
  min-height: 16rem;
  max-height: 32rem;
  margin: 0;
  padding: 1rem;
  line-height: 1.35;
}

.site-footer {
  padding: 0 0 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

@media (max-width: 860px) {
  .site-header,
  .panel-header,
  .row-header {
    grid-template-columns: 1fr;
  }

  .site-header,
  .panel-header,
  .row-header {
    display: grid;
  }

  .header-actions,
  .toolbar,
  .row-actions {
    justify-content: flex-start;
  }

  .block-card {
    grid-template-columns: 1fr;
  }

  .field select {
    min-width: 100%;
  }

  .font-field,
  .font-combobox {
    min-width: 100%;
  }
}

@media (max-width: 520px) {
  .site-header,
  .site-footer,
  .app-shell {
    width: min(100% - 1rem, 1280px);
  }

  .panel,
  .builder-row {
    border-radius: 14px;
    padding: 0.85rem;
  }

  .button,
  .icon-button {
    width: 100%;
    justify-content: center;
  }

  .toolbar,
  .header-actions,
  .row-actions,
  .block-actions {
    width: 100%;
  }

  .inline-field {
    grid-template-columns: 1fr;
  }
}