:root {
  --paper: #f3ecdd;
  --paper-alt: #ece2cd;
  --card: #faf6ec;
  --ink: #1c2433;
  --ink-dim: #4b5769;
  --ink-faint: #7c8494;
  --accent: #3f5c78;
  --accent-deep: #24374a;
  --border: rgba(28, 36, 51, 0.14);
  --border-strong: rgba(28, 36, 51, 0.26);
  --radius: 6px;
  --wrap: 1040px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

html, body {
  overflow-x: hidden;
  max-width: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding-inline: 24px;
}

a {
  color: inherit;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: rgba(63, 92, 120, 0.12);
  color: var(--accent-deep);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.92em;
}

h1, h2, h3 {
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0;
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--paper);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 22px;
  padding-block: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--ink);
  margin-right: auto;
  min-width: 0;
}

.brand-mark {
  display: block;
  border-radius: 5px;
}

.site-nav {
  display: flex;
  gap: 20px;
}

.site-nav a {
  text-decoration: none;
  color: var(--ink-dim);
  font-size: 0.92rem;
}

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

@media (max-width: 720px) {
  .site-nav {
    display: none;
  }
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.94rem;
  text-align: center;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.btn-primary:hover {
  background: var(--accent-deep);
  border-color: var(--accent-deep);
}

.btn-ghost {
  border-color: var(--border-strong);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: var(--ink);
}

.btn-small {
  padding: 8px 16px;
  font-size: 0.85rem;
}

/* ---------- hero ---------- */

.hero {
  padding-block: 60px 44px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 48px;
  align-items: center;
}

.hero-inner > * {
  min-width: 0;
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }
}

.hero h1 {
  font-size: clamp(1.7rem, 3.2vw, 2.35rem);
  line-height: 1.2;
  margin-bottom: 16px;
  max-width: 18ch;
}

.lede {
  color: var(--ink-dim);
  font-size: 1.04rem;
  max-width: 48ch;
  margin: 0 0 24px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 14px;
}

.hero-note {
  color: var(--ink-faint);
  font-size: 0.85rem;
  margin: 0;
}

/* ---------- chat mock ---------- */

.chat-window {
  width: 100%;
  max-width: 100%;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.chat-window-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 15px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--ink);
}

.chat-window-bar img {
  border-radius: 4px;
}

.chat-log {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 16px;
}

.bubble {
  padding: 9px 13px;
  border-radius: 8px;
  font-size: 0.9rem;
  max-width: 88%;
  line-height: 1.42;
}

.bubble-in {
  align-self: flex-end;
  background: var(--ink);
  color: var(--paper);
}

.bubble-out {
  align-self: flex-start;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--border);
}

/* ---------- strip ---------- */

.strip {
  margin: 0;
  text-align: center;
  padding-block: 16px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  color: var(--ink-dim);
  font-size: 0.92rem;
}

/* ---------- sections ---------- */

.section {
  padding-block: 60px;
}

.section-alt {
  background: var(--paper-alt);
}

.section h2 {
  font-size: clamp(1.4rem, 2.4vw, 1.7rem);
  margin-bottom: 10px;
}

.section-lede {
  color: var(--ink-dim);
  max-width: 60ch;
  margin: 0 0 32px;
}

.section-para {
  color: var(--ink-dim);
  max-width: 66ch;
  margin: 20px 0 0;
}

.section-footnote {
  color: var(--ink-faint);
  font-size: 0.88rem;
  margin: 28px 0 0;
}

/* ---------- feature grid ---------- */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.feature-grid > * {
  min-width: 0;
}

@media (max-width: 720px) {
  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }
}

.feature {
  background: var(--card);
  padding: 18px 20px;
}

.feature h3 {
  font-size: 0.98rem;
  margin-bottom: 6px;
  color: var(--ink);
}

.feature p {
  margin: 0;
  color: var(--ink-dim);
  font-size: 0.9rem;
}

/* ---------- pricing ---------- */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.pricing-grid > * {
  min-width: 0;
}

@media (max-width: 720px) {
  .pricing-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 420px) {
  .pricing-grid {
    grid-template-columns: 1fr;
  }
}

.price-card {
  background: var(--card);
  padding: 20px 18px;
}

.price-card h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
  margin-bottom: 10px;
}

.price-amount {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 8px;
}

.price-amount span {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--ink-faint);
  margin-left: 5px;
}

.price-detail {
  margin: 0;
  color: var(--ink-dim);
  font-size: 0.86rem;
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 24px;
}

.footer-inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 18px;
  font-size: 0.85rem;
  color: var(--ink-faint);
}

.footer-inner a {
  text-decoration: none;
  margin-left: auto;
}

.footer-inner a:hover {
  color: var(--ink);
}

.footer-dim {
  color: var(--ink-faint);
}