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

:root {
  --deep: #1a3c2e;
  --mid: #2d6a4f;
  --light: #52b788;
  --pale: #b7e4c7;
  --cream: #f8f5ef;
  --cream2: #ede8df;
  --text: #1c2b22;
  --muted: #3d5a47;
  --white: #fff;
  --accent: #e9c46a;
}

html { scroll-behavior: smooth; scroll-padding-top: 56px; }
body { font: 1rem/1.6 system-ui, sans-serif; background: var(--cream); color: var(--text); overflow-x: hidden; }

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.5rem 1rem;
  min-height: 52px;
  background: var(--deep);
}
.nav-check {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.nav-burger { display: none; }
.nav-logo { font-size: 0.85rem; color: var(--pale); flex: 1; min-width: 0; }
.nav-logo span { color: var(--accent); }
.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.75rem;
  list-style: none;
  justify-content: flex-end;
  margin: 0;
  padding: 0;
}
.nav-links a { color: var(--pale); font-size: 0.65rem; text-decoration: none; text-transform: uppercase; padding: 0.35rem 0.15rem; }

.hero {
  min-height: 100vh;
  padding: 5rem 1rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  background: var(--deep) url('hero-bg-flat-lay.png') center / cover no-repeat;
}
@supports (min-height: 100dvh) {
  .hero {
    min-height: 100dvh;
  }
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(26, 60, 46, 0.88), rgba(26, 60, 46, 0.85));
  pointer-events: none;
}
.hero > * { position: relative; z-index: 1; }

.hero-badge {
  display: inline-block;
  margin-bottom: 1rem;
  padding: 0.35rem 0.9rem;
  border: 1px solid rgba(82, 183, 136, 0.35);
  border-radius: 999px;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--light);
}
.hero h1 { font-size: clamp(1.75rem, 5vw, 3rem); color: var(--white); line-height: 1.15; margin-bottom: 0.35rem; }
.hero h1 em { font-style: italic; color: var(--pale); }
.hero h1.title-two-lines { font-style: italic; color: var(--pale); }
.hero h1.title-two-lines::first-line { font-style: normal; color: var(--white); }
.hero-desc { max-width: 36rem; color: rgba(183, 228, 199, 0.75); font-size: 0.9rem; margin-bottom: 1.25rem; }

.hero-buttons { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; margin-bottom: 1.5rem; }
.btn {
  display: inline-block;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid transparent;
}
.btn-primary { background: var(--light); color: var(--deep); }
.btn-outline { border-color: rgba(82, 183, 136, 0.45); color: var(--pale); }

.hero-cards { display: flex; flex-wrap: wrap; gap: 0.75rem; justify-content: center; max-width: 56rem; }
.hero-card {
  flex: 1 1 14rem;
  max-width: 17rem;
  padding: 1rem;
  text-align: left;
  border-radius: 12px;
  border: 1px solid rgba(82, 183, 136, 0.25);
  background: rgba(255, 255, 255, 0.06);
}
.hero-card-icon { font-size: 1.5rem; display: block; margin-bottom: 0.35rem; }
.hero-card h3 { font-size: 0.88rem; color: var(--pale); margin-bottom: 0.35rem; }
.hero-card p { font-size: 0.78rem; color: rgba(183, 228, 199, 0.65); }

section { padding: 3rem 1rem; }
.container { max-width: 68rem; margin: 0 auto; }

.section-title { font-size: clamp(1.35rem, 3.5vw, 2rem); color: var(--deep); margin-bottom: 0.75rem; line-height: 1.2; }
.section-title em { font-style: italic; color: var(--mid); }
.title-two-lines { font-style: italic; }
.title-two-lines::first-line { font-style: normal; }
.section-title.title-two-lines { color: var(--mid); }
.section-title.title-two-lines::first-line { color: var(--deep); }
.section--dark .section-title.title-two-lines { color: var(--light); }
.section--dark .section-title.title-two-lines::first-line { color: var(--white); }
.section-lead { color: var(--muted); max-width: 40rem; margin-bottom: 1.25rem; font-size: 0.95rem; }

.section-banner {
  margin-bottom: 1.25rem;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--cream2);
  background: var(--cream2);
  display: block;
}
.section-banner img {
  display: block;
  width: 100%;
  height: clamp(11rem, 38vw, 22rem);
  object-fit: cover;
  object-position: center;
}

#healthy-lifestyle, #habits, #memos { background: var(--cream); }
#prevention { background: var(--cream2); }

.section--dark { background: var(--deep); color: var(--white); }
.section--dark .section-title { color: var(--white); }
.section--dark .section-title em { color: var(--light); }
.section--dark .section-lead { color: rgba(183, 228, 199, 0.8); }
.section--dark .section-banner {
  border-color: rgba(82, 183, 136, 0.25);
  background: rgba(12, 32, 24, 0.55);
}

.lifestyle-grid { display: grid; gap: 0.75rem; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.lifestyle-item,
.habit-card,
.memo-card {
  padding: 1rem;
  background: var(--white);
  border: 1px solid var(--cream2);
  border-radius: 12px;
  min-width: 0;
}
.lifestyle-icon { font-size: 1.5rem; margin-bottom: 0.35rem; }
.lifestyle-item h3 { font-size: 0.88rem; color: var(--deep); margin-bottom: 0.25rem; }
.lifestyle-item p { font-size: 0.82rem; color: var(--muted); }

.advice-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); }
.advice-card {
  padding: 1.25rem;
  border-radius: 12px;
  border: 1px solid rgba(82, 183, 136, 0.2);
  background: rgba(255, 255, 255, 0.06);
}
.section--dark .advice-card h3 { color: var(--pale); font-size: 1.05rem; margin-bottom: 0.5rem; }
.section--dark .advice-card p { color: rgba(183, 228, 199, 0.75); font-size: 0.88rem; margin-bottom: 0.65rem; }
.advice-list { list-style: none; padding: 0; }
.advice-list li {
  position: relative;
  padding: 0.35rem 0 0.35rem 1rem;
  font-size: 0.85rem;
  color: rgba(183, 228, 199, 0.85);
  border-bottom: 1px solid rgba(82, 183, 136, 0.12);
}
.advice-list li::before { content: '→'; position: absolute; left: 0; color: var(--light); }

.habits-grid { display: grid; gap: 0.75rem; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.habit-num { font-size: 2rem; color: var(--pale); line-height: 1; margin-bottom: 0.35rem; }
.habit-card h3 { font-size: 0.92rem; color: var(--deep); margin-bottom: 0.25rem; }
.habit-card p { font-size: 0.82rem; color: var(--muted); }

.disease-tabs { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-bottom: 1rem; }
.tab-btn {
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--cream2);
  border-radius: 999px;
  background: var(--white);
  color: var(--muted);
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
}
.tab-btn.active, .tab-btn:hover { background: var(--mid); color: var(--white); border-color: var(--mid); }
.tab-content { display: none; }
.tab-content.active { display: block; }

.disease-tips { display: grid; gap: 0.5rem; grid-template-columns: 1fr; }
.tip-item {
  padding: 0.65rem 0.75rem;
  background: var(--white);
  border-radius: 8px;
  font-size: 0.82rem;
  border-left: 3px solid var(--light);
}

.habits-bad-grid { display: grid; gap: 0.75rem; grid-template-columns: repeat(5, minmax(0, 1fr)); margin-bottom: 1.25rem; }
.bad-habit-card {
  min-width: 0;
  padding: 1rem;
  border-radius: 12px;
  border: 1px solid rgba(82, 183, 136, 0.2);
  background: rgba(255, 255, 255, 0.05);
}
.bad-habit-card .icon { font-size: 1.5rem; display: block; margin-bottom: 0.35rem; }
.bad-habit-card h3 { font-size: 0.82rem; color: var(--pale); margin-bottom: 0.25rem; }
.bad-habit-card p { font-size: 0.75rem; color: rgba(183, 228, 199, 0.65); }

.memo-grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr)); }
.memo-card h3 { font-size: 1rem; color: var(--deep); margin-bottom: 0.65rem; }
.memo-steps { padding-left: 1.1rem; margin: 0; }
.memo-steps li { font-size: 0.82rem; color: var(--muted); margin-bottom: 0.25rem; }

footer { padding: 2rem 1rem; text-align: center; background: var(--deep); border-top: 1px solid rgba(82, 183, 136, 0.2); }
.footer-logo { color: var(--pale); font-size: 1.1rem; margin-bottom: 0.75rem; }
.disclaimer {
  max-width: 40rem;
  margin: 0 auto 0.75rem;
  padding: 0.75rem;
  font-size: 0.75rem;
  line-height: 1.55;
  color: rgba(183, 228, 199, 0.55);
  border: 1px solid rgba(82, 183, 136, 0.2);
  border-radius: 8px;
}
.footer-copy { font-size: 0.7rem; color: rgba(183, 228, 199, 0.35); }

@media (max-width: 64rem) {
  :root {
    --nav-scroll-pad: 4.75rem;
  }
  html {
    scroll-padding-top: var(--nav-scroll-pad);
  }
  html:has(#nav-drawer:checked),
  html:has(#nav-drawer:checked) body {
    overflow: hidden;
    overscroll-behavior: none;
  }
  nav {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-rows: auto;
    align-items: center;
    column-gap: 0.5rem;
    row-gap: 0;
    padding: max(0.45rem, env(safe-area-inset-top)) max(0.75rem, env(safe-area-inset-right)) 0.5rem max(0.75rem, env(safe-area-inset-left));
    min-height: 0;
  }
  .nav-logo {
    grid-column: 1;
    grid-row: 1;
    text-align: left;
    font-size: 0.78rem;
    line-height: 1.35;
    padding-right: 0.25rem;
  }
  .nav-burger {
    display: flex;
    grid-column: 2;
    grid-row: 1;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0.28rem;
    width: 2.75rem;
    height: 2.75rem;
    border: 1px solid rgba(82, 183, 136, 0.35);
    border-radius: 8px;
    cursor: pointer;
    align-self: center;
    justify-self: end;
  }
  .nav-burger span {
    display: block;
    width: 1.1rem;
    height: 2px;
    background: var(--pale);
    border-radius: 1px;
    transition: transform 0.2s, opacity 0.2s;
  }
  #nav-drawer:checked ~ .nav-burger span:nth-child(1) {
    transform: translateY(0.38rem) rotate(45deg);
  }
  #nav-drawer:checked ~ .nav-burger span:nth-child(2) { opacity: 0; }
  #nav-drawer:checked ~ .nav-burger span:nth-child(3) {
    transform: translateY(-0.38rem) rotate(-45deg);
  }
  .nav-links {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 20;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: 0.45rem max(0.75rem, env(safe-area-inset-left)) max(0.65rem, env(safe-area-inset-bottom)) max(0.75rem, env(safe-area-inset-right));
    background: var(--deep);
    border-top: 1px solid rgba(82, 183, 136, 0.2);
    box-shadow: 0 0.5rem 1.25rem rgba(0, 0, 0, 0.22);
    max-height: min(22rem, calc(100dvh - var(--nav-scroll-pad)));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  #nav-drawer:checked ~ .nav-links { display: flex; }
  .nav-links a {
    display: block;
    font-size: 0.8rem;
    letter-spacing: 0.04em;
    padding: 0.65rem 0.15rem;
    text-transform: uppercase;
    border-bottom: 1px solid rgba(82, 183, 136, 0.12);
  }
  .nav-links li:last-child a { border-bottom: none; }

  .hero { padding-top: calc(var(--nav-scroll-pad) + 0.75rem); }

  .lifestyle-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .habits-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .habits-bad-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .memo-grid { grid-template-columns: 1fr; }
  section { padding: 2.5rem 1rem; }
}

@media (max-width: 48rem) {
  .lifestyle-grid { grid-template-columns: 1fr; }
  .habits-bad-grid { grid-template-columns: 1fr; }
  .habits-grid { grid-template-columns: 1fr; }
  .hero-buttons { flex-direction: column; width: 100%; max-width: 20rem; margin-left: auto; margin-right: auto; }
  .btn { text-align: center; width: 100%; box-sizing: border-box; }
  .hero-card { max-width: none; flex: 1 1 auto; width: 100%; }
  .tab-btn { min-height: 2.75rem; padding-left: 1rem; padding-right: 1rem; }
  .hero { padding-bottom: max(1.25rem, env(safe-area-inset-bottom)); }
  footer {
    padding-bottom: max(1.5rem, env(safe-area-inset-bottom));
    padding-left: max(1rem, env(safe-area-inset-left));
    padding-right: max(1rem, env(safe-area-inset-right));
  }
}