/* ── CSS Variables ── */
:root {
  --color-bg: #FFFFFF;
  --color-primary: #0D9488;
  --color-accent: #5EEAD4;
  --color-text: #1A1A1A;
  --color-subtext: #666666;
  --color-border: #E8E8E8;
  --color-surface: #F5FAFA;
  --font-heading: 'Noto Sans JP', sans-serif;
  --font-body: 'Noto Sans JP', sans-serif;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

/* ── Reset ── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  text-wrap: balance;
  overflow-wrap: anywhere;
  word-break: auto-phrase;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul, ol {
  list-style: none;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ── Utility ── */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 40px;
  text-align: center;
  letter-spacing: 0.02em;
  text-wrap: balance;
}

h1, h2, h3, p, li, td, th, .btn {
  text-wrap: pretty;
}

.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background: var(--color-primary);
  margin: 12px auto 0;
  border-radius: 2px;
}

/* ── Buttons ── */
.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  transition: opacity 0.2s, transform 0.2s;
  letter-spacing: 0.02em;
}

.btn:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

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

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

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

/* ── Header ── */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.logo {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.04em;
}

.logo a {
  color: inherit;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.header-nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  transition: color 0.2s;
}

.header-nav a:hover {
  color: var(--color-primary);
}

.header-nav a.header-cta {
  margin-left: 8px;
  padding: 10px 20px;
  font-size: 13px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 600;
  transition: opacity 0.2s;
}

.header-nav a.header-cta:hover {
  opacity: 0.85;
  color: #fff;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform 0.3s, opacity 0.3s;
}

.hamburger.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.is-open span:nth-child(2) {
  opacity: 0;
}

.hamburger.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav overlay */
.mobile-nav {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.98);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 48px;
  gap: 32px;
}

.mobile-nav.is-open {
  display: flex;
}

.mobile-nav a {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-text);
}

.mobile-nav a:hover {
  color: var(--color-primary);
}

/* ── Footer ── */
.footer {
  background: var(--color-text);
  color: #fff;
  padding: 48px 0 32px;
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  margin-bottom: 24px;
}

.footer-nav a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  transition: color 0.2s;
}

.footer-nav a:hover {
  color: #fff;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  margin-bottom: 24px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.footer-legal a {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  transition: color 0.2s;
}

.footer-legal a:hover {
  color: #fff;
}

.footer-copy {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .header-nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .section {
    padding: 56px 0;
  }

  .section-title {
    font-size: 24px;
  }

  .container {
    padding: 0 20px;
  }
}

@media (max-width: 480px) {
  .section {
    padding: 40px 0;
  }

  .section-title {
    font-size: 22px;
    margin-bottom: 32px;
  }

  .btn {
    padding: 12px 24px;
    font-size: 14px;
  }
}