* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #1e90ff;
  color: #1a1a1a;
  line-height: 1.8;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
header {
  padding: 20px 0;
  border-bottom: 1px solid #f0f0f0;
}

.header-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  font-weight: 700;
  font-size: 1.1rem;
}

/* Hero */
.hero {
  padding: 100px 0 80px;
  background: #1a1a1a;
  color: #fff;
}

.hero-label {
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: #aaa;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: 2.8rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 1rem;
  color: #bbb;
  margin-bottom: 40px;
  line-height: 1.9;
}

/* Button */
.btn {
  display: inline-block;
  background: #fff;
  color: #1a1a1a;
  padding: 14px 32px;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: opacity 0.2s;
}

.btn:hover {
  opacity: 0.85;
}

.btn-white {
  background: #fff;
  color: #1a1a1a;
}

/* Sections */
section {
  padding: 80px 0;
}

.section-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 40px;
}

/* Problem */
.problem {
  background: #f8f8f8;
}

.check-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.check-list li {
  padding-left: 28px;
  position: relative;
  color: #444;
  font-size: 0.95rem;
}

.check-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: #aaa;
}

/* Cards */
.cards {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.card {
  border: 1px solid #eee;
  border-radius: 8px;
  padding: 28px;
}

.card-icon {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #aaa;
  margin-bottom: 12px;
}

.card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.card p {
  font-size: 0.9rem;
  color: #666;
}

/* Price */
.price {
  background: #f8f8f8;
}

.price-box {
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 40px;
  background: #fff;
  text-align: center;
}

.price-label {
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: #aaa;
  margin-bottom: 12px;
}

.price-num {
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.price-num span {
  font-size: 1rem;
  font-weight: 400;
  color: #888;
}

.price-note {
  margin-top: 12px;
  font-size: 0.8rem;
  color: #aaa;
}

/* About */
.about-inner {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}

.about-text h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.about-text p {
  font-size: 0.95rem;
  color: #555;
}

/* Contact */
.contact {
  background: #1a1a1a;
  color: #fff;
  text-align: center;
}

.contact h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.contact p {
  color: #bbb;
  margin-bottom: 36px;
  font-size: 0.95rem;
}

/* Footer */
footer {
  padding: 32px 0;
  text-align: center;
  font-size: 0.8rem;
  color: #aaa;
  border-top: 1px solid #f0f0f0;
}