:root {
  --bg: #ffffff;
  --bg-soft: #f5f5f5;
  --ink: #111111;
  --muted: #606060;
  --line: #d9d9d9;
  --line-strong: #c3c3c3;
  --accent: #111111;
  --radius: 14px;
  --max: 1200px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Inter", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  opacity: 0.82;
}

img {
  max-width: 100%;
  display: block;
  border-radius: 10px;
}

.container {
  width: min(100% - 48px, var(--max));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  backdrop-filter: blur(8px);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border: 1px solid var(--ink);
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 700;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.main-nav a {
  font-size: 14px;
  font-weight: 600;
  color: #2e2e2e;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line-strong);
  background: #fff;
  color: var(--ink);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 12px;
  font-weight: 700;
}

.hero {
  padding: 76px 0 50px;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 42px;
  align-items: center;
}

.kicker {
  margin: 0 0 8px;
  color: var(--muted);
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.14em;
}

h1,
h2,
h3,
h4 {
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0;
}

h1 {
  font-size: clamp(30px, 5vw, 58px);
  margin-bottom: 18px;
}

h2 {
  font-size: clamp(24px, 3vw, 38px);
  margin-bottom: 16px;
}

h3 {
  font-size: clamp(20px, 2.2vw, 28px);
  margin-bottom: 12px;
}

p {
  margin: 0 0 16px;
  color: #2f2f2f;
}

.subcopy {
  font-size: 18px;
  color: #3f3f3f;
  max-width: 680px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.btn {
  border-radius: 999px;
  padding: 12px 20px;
  border: 1px solid var(--ink);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.01em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

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

.btn-ghost {
  background: #fff;
  color: var(--ink);
}

.section {
  padding: 62px 0;
  border-bottom: 1px solid var(--line);
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: end;
  margin-bottom: 22px;
}

.section-head p {
  margin: 0;
  color: var(--muted);
}

.grid {
  display: grid;
  gap: 16px;
}

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

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 20px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: #999;
}

.card h3,
.card h4 {
  margin-bottom: 10px;
}

.meta {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 10px;
}

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

.badge {
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 12px;
  color: #4b4b4b;
  background: #fff;
}

.logo-wall {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.logo-box {
  border: 1px solid var(--line);
  padding: 16px;
  border-radius: 10px;
  text-align: center;
  color: #5a5a5a;
  font-size: 14px;
  font-weight: 600;
  background: #fafafa;
}

.article-cover {
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--line);
}

.post-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
}

.post-content p {
  margin-bottom: 18px;
}

.post-content h2,
.post-content h3 {
  margin-top: 30px;
}

.post-content ul {
  margin: 0 0 18px 20px;
  padding: 0;
}

.post-content li {
  margin-bottom: 10px;
}

.aside-box {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  background: #fff;
  margin-bottom: 14px;
}

.faq-item {
  border-top: 1px solid var(--line);
  padding: 16px 0;
}

.faq-item h4 {
  margin-bottom: 8px;
}

.form {
  display: grid;
  gap: 12px;
  max-width: 620px;
}

.input,
.textarea {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 14px;
  font-family: inherit;
}

.textarea {
  min-height: 150px;
  resize: vertical;
}

.site-footer {
  padding: 36px 0 42px;
  background: #fafafa;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 20px;
}

.footer-title {
  font-size: 14px;
  margin-bottom: 10px;
  color: #383838;
}

.footer-list {
  display: grid;
  gap: 8px;
}

.footer-list a,
.footer-list span {
  font-size: 14px;
  color: #595959;
}

.note {
  font-size: 12px;
  color: #6c6c6c;
  margin-top: 16px;
}

.mobile-only {
  display: none;
}

@media (max-width: 1024px) {
  .hero-grid,
  .post-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 760px) {
  .container {
    width: min(100% - 28px, var(--max));
  }

  .main-nav {
    position: absolute;
    left: 14px;
    right: 14px;
    top: 74px;
    display: none;
    flex-direction: column;
    align-items: start;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: #fff;
  }

  .main-nav.open {
    display: flex;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .grid-3,
  .grid-4,
  .logo-wall {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 42px 0;
  }

  .mobile-only {
    display: inline;
  }
}