:root {
  --ink: #111827;
  --muted: #667085;
  --line: #ddd7ca;
  --line-strong: #c9c0ad;
  --page: #fffdf8;
  --surface: #ffffff;
  --soft: #f7f4ec;
  --accent: #0f8b8d;
  --accent-dark: #0a696b;
  --amber: #b7791f;
  --shadow: 0 18px 42px rgba(32, 28, 20, 0.08);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  overflow-x: hidden;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  background:
    linear-gradient(180deg, rgba(15, 139, 141, 0.05), transparent 320px),
    var(--page);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(15, 139, 141, 0.22);
  outline-offset: 2px;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(250px, 1fr) auto minmax(160px, 1fr);
  gap: 24px;
  align-items: center;
  min-height: 72px;
  padding: 12px clamp(18px, 4vw, 56px);
  border-bottom: 1px solid rgba(221, 215, 202, 0.8);
  background: rgba(255, 253, 248, 0.92);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  gap: 12px;
  font-weight: 800;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--surface);
  color: var(--accent-dark);
  font-size: 14px;
  box-shadow: 0 8px 18px rgba(15, 139, 141, 0.08);
}

.main-nav {
  display: flex;
  gap: 34px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.main-nav a:hover {
  color: var(--ink);
}

.header-action,
.primary-action,
.secondary-action,
.segment,
.toggle,
.template-card {
  border-radius: 6px;
  font-weight: 800;
}

.header-action {
  justify-self: end;
  min-height: 42px;
  padding: 0 18px;
  border: 0;
  background: var(--ink);
  color: #fff;
}

.page {
  max-width: 1480px;
  margin: 0 auto;
  padding: 30px clamp(16px, 4vw, 56px) 56px;
}

.intro {
  max-width: 860px;
  margin-bottom: 22px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 10px;
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1;
}

.intro p:not(.eyebrow) {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.6;
}

.tool-shell {
  display: grid;
  grid-template-columns: minmax(360px, 0.82fr) minmax(0, 1.18fr);
  gap: 24px;
  align-items: start;
}

.editor-panel,
.preview-panel,
.support-panel,
.examples,
.faq,
.trust-note {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.editor-panel,
.preview-panel {
  padding: 22px;
}

.panel-heading {
  margin-bottom: 18px;
}

.panel-heading h2,
.section-heading h2,
.support-panel h2 {
  margin-bottom: 6px;
  font-size: 22px;
}

.panel-heading p,
.support-panel p,
.examples p,
.faq p {
  color: var(--muted);
  line-height: 1.65;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

label {
  display: grid;
  gap: 7px;
  color: #344054;
  font-size: 13px;
  font-weight: 800;
}

.span-2 {
  grid-column: 1 / -1;
}

input {
  display: block;
  align-self: stretch;
  min-height: 43px;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fffefa;
  color: var(--ink);
  padding: 0 12px;
  font-size: 14px;
}

.choice-group {
  margin: 18px 0 0;
  padding: 0;
  border: 0;
}

legend {
  margin-bottom: 9px;
  color: #344054;
  font-size: 13px;
  font-weight: 800;
}

.segmented,
.view-toggle {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
}

.segment,
.toggle {
  min-height: 34px;
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 0 12px;
  font-size: 13px;
}

.segment.is-selected,
.toggle.is-selected {
  background: #fff;
  color: var(--ink);
  box-shadow: 0 4px 12px rgba(32, 28, 20, 0.08);
}

.swatches {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.swatch {
  width: 34px;
  height: 34px;
  border: 2px solid #fff;
  border-radius: 8px;
  background: #0f8b8d;
  box-shadow: 0 0 0 1px var(--line-strong);
}

.swatch.is-selected {
  box-shadow: 0 0 0 3px rgba(15, 139, 141, 0.25);
}

.swatch.amber {
  background: var(--amber);
}

.swatch.blue {
  background: #2f5fb3;
}

.swatch.plum {
  background: #7b345f;
}

.swatch.charcoal {
  background: #344054;
}

.action-row,
.preview-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.primary-action,
.secondary-action {
  min-height: 44px;
  border: 1px solid var(--line);
  padding: 0 16px;
}

.primary-action {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.primary-action:hover {
  background: var(--accent-dark);
}

.secondary-action {
  background: #fff;
  color: var(--accent-dark);
}

.preview-heading {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: start;
}

.email-frame {
  min-height: 430px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffefa;
  padding: clamp(16px, 2.4vw, 28px);
}

.email-meta {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 8px 18px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.email-meta strong {
  color: var(--ink);
  font-weight: 600;
}

.email-body {
  color: var(--ink);
  line-height: 1.7;
}

.signature-preview {
  margin-top: 22px;
}

.signature-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  max-width: 620px;
}

.avatar {
  display: grid;
  width: 86px;
  height: 86px;
  place-items: center;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 15%, #fff 85%);
  color: var(--accent-dark);
  font-size: 28px;
  font-weight: 900;
}

.signature-content {
  min-width: 0;
  padding-left: 18px;
  border-left: 3px solid var(--accent);
}

.signature-content.compact {
  padding-left: 0;
  border-left: 0;
}

.signature-name {
  margin: 0 0 3px;
  color: var(--accent-dark);
  font-size: 22px;
  font-weight: 900;
}

.signature-role,
.signature-line,
.signature-links {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 14px;
}

.signature-company {
  color: var(--ink);
  font-weight: 800;
}

.signature-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
}

.signature-links a,
.signature-cta {
  color: var(--accent-dark);
  font-weight: 800;
}

.signature-cta {
  display: inline-flex;
  margin-top: 8px;
  border-radius: 6px;
  background: color-mix(in srgb, var(--accent) 12%, #fff 88%);
  padding: 8px 11px;
}

.plain-preview {
  min-height: 260px;
  margin: 0;
  white-space: pre-wrap;
  color: var(--ink);
  font: 14px/1.7 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.template-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.template-card {
  display: grid;
  gap: 10px;
  min-height: 104px;
  border: 1px solid var(--line);
  background: #fff;
  padding: 12px;
  color: var(--ink);
  text-align: left;
}

.template-card.is-selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 139, 141, 0.12);
}

.mini {
  display: block;
  height: 42px;
  border-radius: 6px;
  background:
    linear-gradient(90deg, var(--accent) 0 24%, transparent 24%),
    repeating-linear-gradient(0deg, #d8d1c4 0 4px, transparent 4px 11px);
}

.classic-mini {
  background:
    radial-gradient(circle at 15% 50%, #d8d1c4 0 14px, transparent 15px),
    repeating-linear-gradient(0deg, #d8d1c4 0 4px, transparent 4px 11px);
}

.compact-mini {
  background:
    linear-gradient(90deg, var(--accent) 0 12%, transparent 12%),
    repeating-linear-gradient(0deg, #d8d1c4 0 4px, transparent 4px 12px);
}

.trust-note {
  margin: 20px 0;
  padding: 16px 18px;
  border-color: #e8c887;
  background: #fff8e8;
  color: #4b3a19;
  line-height: 1.5;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.support-panel,
.examples,
.faq {
  padding: 24px;
}

.steps,
.check-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding-left: 22px;
  color: var(--muted);
  line-height: 1.65;
}

.examples,
.faq {
  margin-top: 20px;
}

.section-heading {
  margin-bottom: 18px;
}

.example-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.example-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffefa;
  padding: 16px;
}

.example-grid h3 {
  margin-bottom: 8px;
  color: var(--accent-dark);
}

.faq-list {
  display: grid;
  gap: 10px;
}

details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffefa;
  padding: 14px 16px;
}

summary {
  color: var(--ink);
  font-weight: 800;
  cursor: pointer;
}

details p {
  margin: 10px 0 0;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 40;
  max-width: min(360px, calc(100vw - 36px));
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  padding: 12px 14px;
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity 160ms ease,
    transform 160ms ease;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1050px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .main-nav {
    display: none;
  }

  .tool-shell,
  .support-grid {
    grid-template-columns: 1fr;
  }

  .preview-panel {
    order: 2;
  }
}

@media (max-width: 720px) {
  .site-header {
    min-height: 64px;
    padding-inline: 14px;
  }

  .brand span:last-child {
    max-width: 190px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .header-action {
    min-height: 38px;
    padding-inline: 13px;
  }

  .page {
    padding-inline: 14px;
  }

  h1 {
    font-size: 38px;
  }

  .intro p:not(.eyebrow) {
    font-size: 16px;
  }

  .editor-panel,
  .preview-panel,
  .support-panel,
  .examples,
  .faq {
    padding: 16px;
  }

  .field-grid,
  .template-strip,
  .example-grid {
    grid-template-columns: 1fr;
  }

  .preview-heading {
    display: grid;
  }

  .email-meta {
    grid-template-columns: 58px 1fr;
  }

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

  .signature-content {
    padding-left: 0;
    border-left: 0;
    border-top: 3px solid var(--accent);
    padding-top: 14px;
  }
}