:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f5f5f7;
  --color-text: #222222;
  --color-muted: #666666;
  --color-border: #e0e0e0;
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --max-width: 1040px;
}

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

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Noto Sans JP", sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 15px;
}

/* Layout */

.container {
  width: 100%;
  max-width: var(--max-width);
  padding: 0 16px;
  margin: 0 auto;
}

/* Header */

.site-header {
  border-bottom: 1px solid var(--color-border);
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
}

.logo {
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: inherit;
  transition: opacity 0.15s ease;
}

.logo:hover {
  opacity: 0.8;
}

.nav {
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 14px;
}

.nav a {
  text-decoration: none;
  color: var(--color-muted);
  padding: 4px 8px;
  border-radius: 999px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.nav a:hover {
  background-color: var(--color-bg-alt);
  color: var(--color-text);
}

.nav-cta {
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
}

.nav-cta:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

/* Hero */

.hero {
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--color-border);
}

.hero-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  align-items: center;
}

.hero-text {
  flex: 1 1 320px;
  min-width: 0;
}

.hero-text h1 {
  font-size: 26px;
  line-height: 1.4;
  margin-bottom: 16px;
}

.hero-text p {
  font-size: 15px;
  color: var(--color-muted);
  margin: 0 0 16px;
}

.hero-note {
  font-size: 12px;
  color: var(--color-muted);
  margin-top: 8px;
}

.hero-image {
  flex: 1 1 260px;
  min-width: 0;
}

.hero-image img {
  width: 100%;
  max-width: 420px;
  display: block;
  border-radius: 12px;
  object-fit: cover;
  margin-left: auto;
}

/* Sections */

.section {
  padding: 40px 0;
}

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

.section-title {
  font-size: 20px;
  margin: 0 0 20px;
}

.section p {
  font-size: 14px;
  color: var(--color-muted);
  margin: 0;
}

/* Cards */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}

.card {
  background-color: #ffffff;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  padding: 16px 18px;
}

.section-alt .card {
  background-color: #ffffff;
}

.card h3 {
  font-size: 16px;
  margin: 0 0 8px;
}

.card p {
  font-size: 14px;
  color: var(--color-muted);
  margin: 0;
}

/* Flow */

.flow-list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: flow-counter;
}

.flow-list li {
  border-left: 2px solid var(--color-border);
  padding-left: 16px;
  margin-left: 4px;
  padding-bottom: 16px;
  position: relative;
}

.flow-list li:last-child {
  padding-bottom: 0;
}

.flow-list li::before {
  counter-increment: flow-counter;
  content: counter(flow-counter);
  position: absolute;
  left: -13px;
  top: 4px;
  width: 20px;
  height: 20px;
  border-radius: 999px;
  background-color: #ffffff;
  border: 1px solid var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--color-primary);
}

.flow-list h3 {
  font-size: 15px;
  margin: 0 0 4px;
}

.flow-list p {
  font-size: 14px;
  color: var(--color-muted);
  margin: 0;
}

/* Company */

.company-table {
  margin: 0;
}

.company-table > div {
  display: grid;
  grid-template-columns: 130px 1fr;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}

.company-table dt {
  font-weight: 500;
  font-size: 14px;
}

.company-table dd {
  margin: 0;
  font-size: 14px;
  color: var(--color-muted);
}

/* Contact */

.contact-form {
  margin-top: 20px;
  max-width: 520px;
}

.form-field {
  margin-bottom: 12px;
}

.form-field label {
  display: block;
  font-size: 13px;
  margin-bottom: 4px;
}

.form-field input,
.form-field textarea {
  width: 100%;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  font-size: 14px;
  font-family: inherit;
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.15);
}

.form-note {
  font-size: 12px;
  color: var(--color-muted);
  margin: 4px 0 12px;
}

/* Buttons */

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 18px;
  border-radius: 999px;
  border: none;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, opacity 0.15s ease;
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
}

.btn-primary[disabled] {
  cursor: not-allowed;
  opacity: 0.5;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 14px 0;
  font-size: 12px;
  color: var(--color-muted);
  text-align: center;
}

/* Responsive */

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .hero {
    padding-top: 32px;
  }

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

  .hero-image img {
    margin: 0 auto;
  }

  .company-table > div {
    grid-template-columns: 1fr;
    row-gap: 2px;
  }
}

[id] {
  scroll-margin-top: 30px;
}

@media (max-width: 768px) {
  [id] {
    scroll-margin-top: 120px;
  }
}