:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --line: rgba(0, 0, 0, 0.08);
  --blue: #0066cc;
  --radius: 18px;
  --radius-sm: 12px;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Hiragino Sans",
    "Yu Gothic UI", "BIZ UDPGothic", sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.shell {
  width: min(1080px, calc(100% - 48px));
  margin-inline: auto;
}

/* ── NAV ── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
}

.brand {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  gap: 4px;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--muted);
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}

.nav-links a:hover {
  background: var(--bg-alt);
  color: var(--ink);
  text-decoration: none;
}

/* ── SECTIONS ── */

.s-hero {
  padding: 88px 0 80px;
}

.s-white {
  padding: 80px 0;
}

.s-gray {
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 80px 0;
}

/* ── HERO ── */

.hero {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.eyebrow {
  display: block;
  margin: 0 0 16px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  margin: 0 0 20px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display",
    "Hiragino Sans", sans-serif;
  font-size: clamp(2.2rem, 4.5vw, 3.6rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--ink);
  word-break: keep-all;
  overflow-wrap: break-word;
}

h2 {
  margin: 0 0 16px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display",
    "Hiragino Sans", sans-serif;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--ink);
}

h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}

p {
  margin: 0 0 14px;
  color: var(--muted);
}

p:last-child {
  margin-bottom: 0;
}

.lead {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--muted);
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 32px;
  justify-content: center;
}

.btn,
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 980px;
  font-size: 0.94rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  text-decoration: none;
  transition: opacity 0.15s, transform 0.15s;
  cursor: pointer;
}

.btn:hover,
.button-link:hover {
  opacity: 0.82;
  transform: translateY(-1px);
  text-decoration: none;
}

.btn.primary,
.button-link.primary {
  background: var(--ink);
  color: #fff;
}

.btn.secondary,
.button-link.secondary {
  background: var(--bg-alt);
  color: var(--ink);
}

/* ── HERO POINTS ── */

.hero-points {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 48px;
}

.hero-point {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: var(--bg-alt);
  border-radius: 14px;
  padding: 16px 20px;
  min-width: 140px;
  flex: 1;
  max-width: 200px;
  text-align: center;
}

.hero-point strong {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
  line-height: 1.4;
}

.hero-point span {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.4;
}

.feat-list {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.feat-list li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.feat-list li:first-child { padding-top: 0; }
.feat-list li:last-child { border-bottom: none; padding-bottom: 0; }

.feat-list strong {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.feat-list span {
  font-size: 0.84rem;
  color: var(--muted);
}

/* ── CARD GRID / SPLIT ── */

.grid,
.split {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.card {
  background: var(--bg);
  padding: 40px;
}

/* Cards inside gray section: keep white */
.s-gray .card {
  background: var(--bg);
}

/* ── LISTS ── */

.check-list {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.55;
}

.check-list li:first-child { padding-top: 0; }
.check-list li:last-child { border-bottom: none; padding-bottom: 0; }

.check-list li::before {
  content: "✓";
  flex-shrink: 0;
  font-weight: 700;
  color: var(--ink);
  font-size: 0.85rem;
  margin-top: 2px;
}

.stack-list {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.stack-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.55;
}

.stack-list li:first-child { padding-top: 0; }
.stack-list li:last-child { border-bottom: none; padding-bottom: 0; }

.stack-list li::before {
  content: "—";
  flex-shrink: 0;
  color: var(--muted);
  margin-top: 1px;
}

/* ── META BLOCKS (permission list) ── */

.meta {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-top: 20px;
}

.meta-block {
  background: var(--bg-alt);
  padding: 20px 24px;
}

.meta-label {
  display: block;
  margin: 0 0 6px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ── PILLS ── */

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--muted);
  background: var(--bg);
}

/* ── CONTACT ── */

.contact-list {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-top: 20px;
}

.contact-list div {
  background: var(--bg-alt);
  padding: 20px 24px;
}

.contact-list dt {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 6px;
}

.contact-list dd {
  margin: 0;
  color: var(--ink);
  word-break: break-all;
}

/* ── CODE ── */

code {
  padding: 2px 7px;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.06);
  font-family: "SF Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.87em;
  color: var(--ink);
  letter-spacing: 0;
}

/* ── STEPS ── */

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 12px;
  flex-shrink: 0;
}

.step h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 600;
}

.step p {
  font-size: 0.88rem;
  margin: 0 0 14px;
}

.step img {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--line);
  display: block;
}

@media (max-width: 860px) {
  .steps {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
  }
}

/* ── LIMITED USE (prose block) ── */

.prose {
  max-width: 44rem;
}

.prose .check-list {
  margin-top: 24px;
}

/* ── FOOTER ── */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 32px 0;
}

.site-footer p {
  font-size: 0.88rem;
  color: var(--muted);
  margin: 0;
}

/* ── RESPONSIVE ── */

@media (max-width: 860px) {
  .s-hero { padding: 64px 0 52px; }
  .s-white, .s-gray { padding: 60px 0; }

  .hero {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .grid,
  .split {
    grid-template-columns: 1fr;
  }

  .card { padding: 28px; }
  .hero-panel { padding: 28px; }
}

@media (max-width: 600px) {
  .shell {
    width: calc(100% - 32px);
  }

  .nav {
    height: auto;
    flex-direction: column;
    align-items: flex-start;
    padding: 12px 0;
    gap: 8px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn,
  .button-link {
    width: 100%;
    text-align: center;
  }
}