:root {
  --bg: #fbfaf7;
  --panel: #ffffff;
  --ink: #15151a;
  --ink-soft: #44444d;
  --ink-mute: #7a7a82;
  --line: #e8e6df;
  --line-soft: #f0eee7;
  --brand: #ff5a1f;
  --brand-ink: #b93500;
  --radius: 14px;
  --radius-lg: 22px;
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-serif: "Instrument Serif", Georgia, serif;
  --focus: 0 0 0 3px rgba(255, 90, 31, 0.28);
}

@media (prefers-color-scheme: dark) {
  /* stays light — intentional */
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.55;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; }
input, textarea { font: inherit; color: inherit; }
img, svg { max-width: 100%; display: block; }

.container {
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 20px;
}

@media (min-width: 720px) {
  .container { padding: 0 28px; }
}

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251, 250, 247, 0.82);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px;
  min-height: 64px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 700; letter-spacing: -0.01em;
  color: var(--ink);
}
.brand-mark {
  width: 22px; height: 22px; border-radius: 6px; flex: none;
  background:
    radial-gradient(120% 120% at 20% 10%, #ffd27a 0%, var(--brand) 55%, #b93500 100%);
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.08);
}
.brand-name { font-size: 16px; }
.brand-tld { color: var(--brand); font-weight: 700; }

.nav-links {
  display: none;
  gap: 24px;
  margin-left: auto; margin-right: 18px;
}
.nav-links a { color: var(--ink-soft); font-size: 14.5px; }
.nav-links a:hover { color: var(--ink); }

.nav-cta { padding: 9px 14px; font-size: 14px; }

@media (min-width: 720px) {
  .nav-links { display: flex; }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 600; font-size: 14.5px; letter-spacing: -0.005em;
  border-radius: 999px; padding: 11px 18px; line-height: 1;
  min-height: 44px;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: transform 0.08s ease, background 0.15s ease, box-shadow 0.15s ease, color 0.15s ease, filter 0.15s ease;
}
.btn:focus-visible { outline: none; box-shadow: var(--focus); }
.btn:active { transform: translateY(1px); }
.btn-primary {
  color: #fff;
  background: linear-gradient(180deg, #ff6a31 0%, var(--brand) 70%, #e84a10 100%);
  box-shadow: 0 4px 14px rgba(255,90,31,0.28), inset 0 1px 0 rgba(255,255,255,0.3);
}
.btn-primary:hover { filter: brightness(1.04); }
.btn-primary:disabled { filter: saturate(0.6) brightness(0.95); cursor: progress; }
.btn-ghost { color: var(--ink); background: transparent; border-color: var(--line); }
.btn-ghost:hover { background: #fff; }
.btn-lg { padding: 14px 22px; font-size: 15.5px; min-height: 50px; }
.btn-block { width: 100%; }

/* ---------- hero ---------- */
.hero {
  padding: 64px 0 32px;
}
.hero-inner { max-width: 760px; margin: 0 auto; text-align: center; }
.hero-title {
  font-weight: 800;
  font-size: clamp(34px, 6.4vw, 62px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 18px;
}
.hero-title em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--brand);
  letter-spacing: -0.005em;
}
.br-lg { display: none; }
@media (min-width: 720px) { .br-lg { display: inline; } }

.hero-sub {
  font-size: clamp(16px, 2.2vw, 18px);
  color: var(--ink-soft);
  max-width: 560px;
  margin: 0 auto 26px;
}

@media (min-width: 720px) {
  .hero { padding: 96px 0 40px; }
}

/* ---------- builder ---------- */
.builder { padding: 24px 0 72px; }
.builder-inner { max-width: 980px; margin: 0 auto; }
.builder-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 900px) {
  .builder { padding: 40px 0 96px; }
  .builder-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px;
}
@media (min-width: 720px) {
  .panel { padding: 28px; }
}

.form { display: flex; flex-direction: column; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field label {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-soft);
  letter-spacing: 0.005em;
}
.field input, .field textarea {
  width: 100%;
  background: #fbfaf7;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 14px;
  font-size: 16px; /* prevents iOS zoom on focus */
  color: var(--ink);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.field textarea { resize: vertical; min-height: 92px; font-family: inherit; }
.field input::placeholder,
.field textarea::placeholder { color: var(--ink-mute); }
.field input:focus,
.field textarea:focus {
  border-color: var(--brand);
  background: #fff;
  box-shadow: var(--focus);
}
.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.note {
  margin: 2px 0 0;
  font-size: 12.5px;
  color: var(--ink-mute);
  line-height: 1.45;
}

/* submit button with spinner */
.submit-spinner {
  width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.35);
  border-top-color: #fff;
  animation: spin 0.8s linear infinite;
  display: none;
}
#submit.loading .submit-label { opacity: 0.7; }
#submit.loading .submit-spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- output ---------- */
.output {
  min-height: 240px;
  display: flex; flex-direction: column; gap: 14px;
  position: relative;
}
.output-empty {
  margin: auto; text-align: center; color: var(--ink-mute);
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  font-size: 14.5px;
}
.output-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 6px rgba(255, 90, 31, 0.12);
}
.output[aria-busy="true"] .output-dot { animation: pulse 1.2s ease-in-out infinite; }
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 90, 31, 0.25); }
  50% { box-shadow: 0 0 0 10px rgba(255, 90, 31, 0.02); }
}

.output-content {
  font-size: 15px;
  color: var(--ink);
  line-height: 1.6;
}
.output-content h3 {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--brand);
  font-size: 22px;
  letter-spacing: -0.005em;
  margin: 16px 0 6px;
}
.output-content h3:first-child { margin-top: 0; }
.output-content p { margin: 0 0 10px; }
.output-content ol, .output-content ul {
  margin: 6px 0 10px;
  padding-left: 22px;
}
.output-content li { margin: 4px 0; }
.output-content strong { color: var(--ink); font-weight: 600; }
.output-content em { font-style: italic; }

.output-actions { display: flex; gap: 10px; }
.output-error {
  background: #fff2ec;
  border: 1px solid #ffd6c1;
  color: var(--brand-ink);
  border-radius: var(--radius);
  padding: 12px 14px;
  font-size: 14px;
}

/* typing cursor during stream */
.cursor {
  display: inline-block;
  width: 2px; height: 1em;
  background: var(--brand);
  margin-left: 2px;
  vertical-align: -2px;
  animation: blink 1s steps(2, start) infinite;
}
@keyframes blink { to { visibility: hidden; } }

/* ---------- sections ---------- */
.section { padding: 72px 0; }
.section-alt { background: #f3f1ea; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-inner { max-width: 880px; margin: 0 auto; }
.section-narrow { max-width: 680px; }
.h2 {
  font-size: clamp(26px, 4vw, 36px);
  letter-spacing: -0.025em;
  font-weight: 800;
  margin: 0 0 28px;
  text-align: center;
}

@media (min-width: 720px) {
  .section { padding: 96px 0; }
}

/* steps */
.steps {
  list-style: none; padding: 0; margin: 0;
  display: grid; grid-template-columns: 1fr; gap: 14px;
}
.steps li {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px;
}
.step-n {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 8px;
  background: #fff2ec; color: var(--brand-ink);
  font-size: 13px; font-weight: 700;
  margin-bottom: 10px;
}
.steps h3 { margin: 0 0 6px; font-size: 17px; letter-spacing: -0.01em; }
.steps p { margin: 0; color: var(--ink-soft); font-size: 14.5px; }

@media (min-width: 820px) {
  .steps { grid-template-columns: repeat(3, 1fr); gap: 18px; }
}

/* ---------- faq ---------- */
.faq { border-top: 1px solid var(--line); }
.faq details {
  border-bottom: 1px solid var(--line);
  padding: 14px 2px;
}
.faq summary {
  list-style: none; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  font-weight: 600; font-size: 15.5px; letter-spacing: -0.005em;
  padding: 6px 0;
  min-height: 32px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-size: 20px; color: var(--ink-mute); flex: none;
}
.faq details[open] summary::after { content: "\2013"; }
.faq p { margin: 8px 0 4px; color: var(--ink-soft); font-size: 14.5px; }

/* ---------- footer ---------- */
.foot {
  padding: 32px 0 40px;
  border-top: 1px solid var(--line);
  background: var(--bg);
}
.foot-inner {
  display: flex; flex-direction: column; gap: 14px;
  align-items: flex-start;
}
.foot-links { display: flex; gap: 18px; }
.foot-links a {
  font-size: 14px; color: var(--ink-mute);
}
.foot-links a:hover { color: var(--ink); }

@media (min-width: 600px) {
  .foot-inner { flex-direction: row; justify-content: space-between; align-items: center; }
}

/* ---------- motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}