:root {
  --bg: #f5f5f7;
  --panel: rgba(255, 255, 255, 0.72);
  --panel-strong: #ffffff;
  --border: rgba(15, 23, 42, 0.08);
  --text: #1d1d1f;
  --muted: #5f6368;
  --accent: #0a84ff;
  --accent-strong: #0066d6;
  --shadow: 0 20px 40px rgba(15, 23, 42, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "SF Pro Display", "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(10, 132, 255, 0.12), transparent 32%),
    radial-gradient(circle at bottom right, rgba(88, 166, 255, 0.08), transparent 28%),
    var(--bg);
  color: var(--text);
  line-height: 1.7;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
}

header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  background: rgba(245, 245, 247, 0.7);
  border-bottom: 1px solid rgba(255, 255, 255, 0.5);
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
}

.brand {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.04em;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0 14px;
  border-radius: 999px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.nav-list a:hover {
  background: rgba(10, 132, 255, 0.08);
  color: var(--accent-strong);
}

.hero {
  padding: 72px 0 40px;
}

.hero-box {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 30px;
  align-items: center;
}

.hero-text,
.hero-image,
.card,
.article-item {
  background: var(--panel);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 24px;
}

.hero-text {
  padding: 42px 36px;
}

.hero-text h1 {
  margin: 0 0 16px;
  font-size: clamp(2.3rem, 5vw, 4.1rem);
  line-height: 1.04;
  letter-spacing: -0.06em;
}

.hero-text p {
  margin: 0 0 24px;
  max-width: 640px;
  color: var(--muted);
  font-size: 1.04rem;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  border: 1px solid rgba(0, 0, 0, 0.04);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #fff;
  box-shadow: 0 12px 24px rgba(10, 132, 255, 0.2);
}

.secondary-btn {
  background: rgba(255, 255, 255, 0.7);
  color: var(--text);
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: none;
}

.hero-image {
  min-height: 260px;
  display: grid;
  place-items: center;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: #2e3a46;
  background: linear-gradient(160deg, #edf6ff, rgba(255, 255, 255, 0.9));
}

.section {
  padding: 30px 0 56px;
}

.section h2 {
  margin: 0 0 20px;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  letter-spacing: -0.05em;
}

.card-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.card {
  padding: 22px 20px;
}

.card h3 {
  margin-top: 0;
  margin-bottom: 12px;
  font-size: 1.2rem;
}

.card p,
.card li,
.article-item p {
  color: var(--muted);
}

ul {
  padding-left: 18px;
  margin: 0;
}

.article-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.article-item {
  padding: 22px 24px;
  margin-bottom: 18px;
}

.article-item h3 {
  margin: 0 0 8px;
  font-size: 1.3rem;
}

footer {
  padding: 26px 0 34px;
  color: var(--muted);
  text-align: center;
}

@media (max-width: 760px) {
  .hero-box {
    grid-template-columns: 1fr;
  }

  .nav-list {
    gap: 4px;
  }

  .nav-list a {
    padding: 0 10px;
    font-size: 0.82rem;
  }

  .hero-text {
    padding: 28px 20px;
  }
}