:root {
  --ink: #162029;
  --muted: #657282;
  --paper: #f5f7f9;
  --panel: #ffffff;
  --line: #d9e1e8;
  --line-strong: #b9c5d1;
  --blue: #2554d8;
  --blue-dark: #1d3fa9;
  --teal: #008476;
  --amber: #c47a00;
  --danger: #c2410c;
  --shadow: 0 18px 44px rgba(22, 32, 41, 0.08);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.45;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 62px;
  padding: 0 24px;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.brand {
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

.topnav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topnav a,
.secondary-btn,
.primary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.topnav a,
.secondary-btn {
  color: var(--ink);
  background: var(--panel);
  border: 1px solid var(--line);
}

.topnav a:hover,
.secondary-btn:hover {
  border-color: var(--line-strong);
}

.primary-btn {
  width: 100%;
  color: #ffffff;
  background: var(--blue);
  border: 1px solid var(--blue);
  cursor: pointer;
}

.primary-btn:hover {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
}

.primary-btn:disabled {
  background: #8793a1;
  border-color: #8793a1;
  cursor: not-allowed;
}

.builder-shell {
  width: min(1760px, 100%);
  margin: 0 auto;
  padding: 22px;
}

.builder-grid {
  display: grid;
  grid-template-columns: 220px minmax(420px, 1fr) 360px;
  gap: 18px;
  align-items: start;
}

.step-rail,
.template-panel,
.builder-panel,
.preview-area {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.step-rail {
  position: sticky;
  top: 84px;
  padding: 16px;
}

.steps {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.step {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 10px;
  align-items: center;
  min-height: 52px;
  color: var(--muted);
}

.step-number {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  color: var(--muted);
  background: #eef2f6;
  border: 1px solid var(--line);
  border-radius: 50%;
  font-weight: 800;
  font-size: 0.82rem;
}

.step strong,
.rail-note strong {
  display: block;
  color: var(--ink);
  font-size: 0.9rem;
}

.step small {
  display: block;
  max-width: 150px;
  overflow: hidden;
  color: inherit;
  font-size: 0.75rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.step.is-active .step-number,
.step.is-done .step-number {
  color: #ffffff;
  background: var(--blue);
  border-color: var(--blue);
}

.step.is-done .step-number {
  background: var(--teal);
  border-color: var(--teal);
}

.rail-note {
  display: grid;
  gap: 4px;
  margin-top: 20px;
  padding: 14px;
  background: #f7fafc;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--muted);
  font-size: 0.8rem;
}

.note-label,
.eyebrow {
  color: var(--teal);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-head,
.panel-head,
.preview-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 14px;
}

.template-panel {
  padding: 18px;
}

.eyebrow {
  margin: 0 0 4px;
}

h1,
h2 {
  margin: 0;
  line-height: 1.1;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(1.45rem, 2vw, 2rem);
}

h2 {
  font-size: 1.05rem;
}

.template-tools {
  display: grid;
  grid-template-columns: minmax(170px, 1fr) 150px;
  gap: 8px;
  width: min(430px, 48%);
}

input,
select,
textarea {
  width: 100%;
  min-height: 40px;
  color: var(--ink);
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

input,
select {
  padding: 0 11px;
}

textarea {
  padding: 10px 11px;
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus,
button:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(37, 84, 216, 0.18);
  outline-offset: 2px;
  border-color: var(--blue);
}

.template-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(184px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.template-card {
  display: grid;
  gap: 9px;
  min-height: 274px;
  padding: 10px;
  color: var(--ink);
  text-align: left;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
}

.template-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-1px);
}

.template-card.is-selected {
  border-color: var(--blue);
  box-shadow: 0 0 0 2px rgba(37, 84, 216, 0.22);
}

.template-thumb {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 10.5;
  background: var(--swatch, #d8dee7);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.template-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
}

.template-name {
  display: -webkit-box;
  overflow: hidden;
  min-height: 2.4em;
  font-size: 0.86rem;
  font-weight: 800;
  line-height: 1.2;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.template-copy {
  display: -webkit-box;
  overflow: hidden;
  min-height: 3.15em;
  color: var(--muted);
  font-size: 0.74rem;
  line-height: 1.4;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
}

.template-meta {
  display: flex;
  gap: 6px;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  color: var(--muted);
  font-size: 0.68rem;
}

.swatch-dot {
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  background: var(--swatch, var(--blue));
  border: 1px solid rgba(22, 32, 41, 0.18);
  border-radius: 50%;
}

.builder-panel {
  position: sticky;
  top: 84px;
  padding: 18px;
}

.field {
  display: grid;
  gap: 6px;
  margin-top: 12px;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

label,
legend {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 750;
}

label span {
  color: var(--danger);
}

.brand-fields {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  padding: 12px 0 0;
  margin: 14px 0 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.brand-fields legend {
  grid-column: 1 / -1;
  padding: 0 0 2px;
}

.brand-fields label {
  display: grid;
  gap: 6px;
}

.brand-fields label span {
  color: var(--muted);
  font-size: 0.7rem;
}

.brand-fields input[type="color"] {
  min-height: 36px;
  padding: 3px;
  cursor: pointer;
}

#generate-btn {
  margin-top: 16px;
}

.status-box {
  display: grid;
  gap: 8px;
  margin-top: 14px;
  padding: 12px;
  background: #f7fafc;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.status-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.84rem;
}

.status-dot {
  width: 10px;
  height: 10px;
  background: var(--teal);
  border-radius: 50%;
}

.status-dot.is-busy {
  background: var(--amber);
}

.status-dot.is-error {
  background: var(--danger);
}

.progress-log {
  display: grid;
  gap: 4px;
  max-height: 124px;
  overflow-y: auto;
  color: var(--muted);
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.72rem;
}

.log-line {
  overflow-wrap: anywhere;
}

.log-line.error {
  color: var(--danger);
}

.result-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 12px;
}

.preview-area {
  margin-top: 18px;
  padding: 16px;
}

.preview-controls {
  display: inline-flex;
  padding: 3px;
  background: #eef2f6;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.size-btn {
  min-width: 86px;
  min-height: 32px;
  padding: 0 12px;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 800;
}

.size-btn.is-active {
  color: var(--ink);
  background: #ffffff;
  box-shadow: 0 1px 4px rgba(22, 32, 41, 0.12);
}

.preview-frame-wrap {
  width: 100%;
  height: 760px;
  margin-top: 14px;
  overflow: hidden;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.preview-frame-wrap.mobile {
  width: 390px;
  max-width: 100%;
  margin-right: auto;
  margin-left: auto;
}

.preview-frame-wrap iframe {
  width: 100%;
  height: 100%;
  border: 0;
  background: #ffffff;
}

.empty-state {
  grid-column: 1 / -1;
  display: grid;
  place-items: center;
  min-height: 180px;
  color: var(--muted);
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
}

@media (max-width: 1280px) {
  .builder-grid {
    grid-template-columns: 190px minmax(360px, 1fr);
  }

  .builder-panel {
    position: static;
    grid-column: 1 / -1;
  }
}

@media (max-width: 860px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px;
  }

  .topnav {
    width: 100%;
    overflow-x: auto;
  }

  .builder-shell {
    padding: 14px;
  }

  .builder-grid {
    grid-template-columns: 1fr;
  }

  .step-rail {
    position: static;
  }

  .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .step {
    grid-template-columns: 28px 1fr;
    gap: 8px;
  }

  .step-number {
    width: 28px;
    height: 28px;
  }

  .section-head,
  .preview-head {
    align-items: stretch;
    flex-direction: column;
  }

  .template-tools {
    width: 100%;
    grid-template-columns: 1fr;
  }

  .field-row,
  .result-actions {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .brand-fields {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .preview-frame-wrap {
    height: 620px;
  }
}