/* ============================================================
   Teeth Clean — Design System v2
   Palette: "Alpine White"
   ============================================================ */

/* ---- Tokens ---- */
:root {
  /* Brand */
  --brand:       #006C67;
  --brand-dark:  #004D49;
  --brand-mid:   #009990;
  --brand-light: #94D2BE;
  --brand-tint:  #E6F3F2;

  /* Accent (amber) */
  --amber:       #E9A020;
  --amber-dark:  #C47E0A;
  --amber-tint:  #FFF4D6;

  /* Success / Health */
  --green:       #22A86B;
  --green-tint:  #E6F7EF;

  /* Surfaces */
  --white:       #FFFFFF;
  --bg-1:        #F7F9F8;   /* slight green-white tint */
  --bg-2:        #EEF3F1;
  --bg-3:        #E2ECEB;
  --bg-dark:     #0D2826;   /* footer / dark sections */
  --bg-dark-2:   #1A3D3A;

  /* Text */
  --label-1:     #1C1C1E;
  --label-2:     #48484A;
  --label-3:     #636366;
  --label-4:     #8E8E93;

  /* Borders / Separators */
  --sep:         #C8D6D5;
  --sep-2:       #DDE7E6;

  /* Shadows */
  --shadow-xs:   0 1px 3px rgba(0,0,0,0.06);
  --shadow-sm:   0 2px 8px rgba(0,0,0,0.08);
  --shadow-md:   0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg:   0 8px 32px rgba(0,0,0,0.13);
  --shadow-xl:   0 16px 48px rgba(0,0,0,0.16);

  /* Radius */
  --r-xs:   6px;
  --r-sm:   10px;
  --r-md:   16px;
  --r-lg:   24px;
  --r-xl:   32px;
  --r-full: 9999px;

  /* Typography */
  --font:         'Noto Sans JP', -apple-system, sans-serif;
  --font-display: 'Zen Kaku Gothic Antique', var(--font);

  /* Transition */
  --ease: 0.22s ease;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.75;
  color: var(--label-1);
  background: var(--white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ---- Layout ---- */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}
@media (min-width: 768px) { .container { padding: 0 32px; } }

.section { padding: 64px 0; }
.section--sm { padding: 40px 0; }
.section--lg { padding: 96px 0; }
.section--tint { background: var(--bg-1); }
.section--dark { background: var(--bg-dark); color: var(--white); }
.section--brand { background: var(--brand-tint); }
.section--amber { background: var(--amber-tint); }

/* ---- Typography ---- */
.eyebrow {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brand);
  background: var(--brand-tint);
  padding: 4px 13px;
  border-radius: var(--r-full);
  margin-bottom: 14px;
}
.eyebrow--amber { color: var(--amber-dark); background: var(--amber-tint); }
.eyebrow--white { color: var(--white); background: rgba(255,255,255,0.15); }

.h1 {
  font-family: var(--font-display);
  font-size: clamp(28px, 7vw, 52px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--label-1);
}
.h2 {
  font-family: var(--font-display);
  font-size: clamp(22px, 5vw, 34px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--label-1);
}
.h3 {
  font-size: clamp(18px, 3.5vw, 24px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--label-1);
}
.h4 { font-size: 17px; font-weight: 700; line-height: 1.45; }
.lead { font-size: 16px; line-height: 1.85; color: var(--label-3); }
.caption { font-size: 12px; color: var(--label-4); line-height: 1.6; }

/* Color utilities */
.text-brand { color: var(--brand); }
.text-amber { color: var(--amber-dark); }
.text-muted  { color: var(--label-3); }
.text-white  { color: var(--white); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--r-full);
  font-size: 15px;
  font-weight: 700;
  white-space: nowrap;
  transition: var(--ease);
  text-decoration: none;
  border: none;
  cursor: pointer;
}
.btn--lg { padding: 16px 36px; font-size: 16px; }
.btn--sm { padding: 9px 20px; font-size: 13px; }
.btn--block { width: 100%; justify-content: center; }

.btn--brand {
  background: var(--brand);
  color: var(--white);
  box-shadow: 0 4px 16px rgba(0,108,103,0.30);
}
.btn--brand:hover {
  background: var(--brand-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0,108,103,0.38);
}

.btn--amber {
  background: var(--amber);
  color: var(--label-1);
  box-shadow: 0 4px 16px rgba(233,160,32,0.30);
}
.btn--amber:hover {
  background: var(--amber-dark);
  color: var(--white);
  transform: translateY(-2px);
}

.btn--outline-brand {
  background: transparent;
  color: var(--brand);
  border: 2px solid var(--brand);
}
.btn--outline-brand:hover {
  background: var(--brand-tint);
  transform: translateY(-2px);
}

.btn--outline-white {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.5);
}
.btn--outline-white:hover { background: rgba(255,255,255,0.10); }

.btn--white {
  background: var(--white);
  color: var(--brand);
  box-shadow: var(--shadow-md);
}
.btn--white:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

.btn--line {
  background: #06C755;
  color: var(--white);
  box-shadow: 0 4px 16px rgba(6,199,85,0.28);
}
.btn--line:hover { background: #05a847; transform: translateY(-2px); }

/* ---- Header ---- */
.tc-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--sep-2);
}
.tc-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 58px;
  gap: 12px;
}
.tc-header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}
.tc-header__logo-mark {
  width: 36px;
  height: 36px;
  background: var(--brand);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.tc-header__logo-text {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--brand);
  letter-spacing: -0.02em;
}
.tc-header__logo-text span { color: var(--label-1); }

.tc-header__nav {
  display: none;
  align-items: center;
  gap: 24px;
}
@media (min-width: 768px) { .tc-header__nav { display: flex; } }
.tc-header__nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--label-2);
  transition: color var(--ease);
}
.tc-header__nav a:hover { color: var(--brand); }

.tc-header__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* ---- Footer ---- */
.tc-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.55);
  padding: 56px 0 32px;
}
.tc-footer__inner {
  display: grid;
  gap: 40px;
}
@media (min-width: 768px) {
  .tc-footer__inner { grid-template-columns: 1fr 1fr; gap: 40px 64px; }
}
.tc-footer__brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}
.tc-footer__tagline { font-size: 13px; line-height: 1.7; margin-bottom: 20px; }
.tc-footer__contact a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #06C755;
  color: var(--white);
  border-radius: var(--r-full);
  padding: 10px 22px;
  font-size: 13px;
  font-weight: 700;
  transition: var(--ease);
}
.tc-footer__contact a:hover { background: #05a847; }
.tc-footer__nav-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 14px;
}
.tc-footer__nav-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.tc-footer__nav-links a {
  font-size: 14px;
  color: rgba(255,255,255,0.65);
  transition: color var(--ease);
}
.tc-footer__nav-links a:hover { color: var(--white); }
.tc-footer__bottom {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.10);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  align-items: center;
  justify-content: space-between;
}
.tc-footer__copy { font-size: 11px; }
.tc-footer__legal {
  display: flex;
  gap: 16px;
}
.tc-footer__legal a {
  font-size: 11px;
  color: rgba(255,255,255,0.45);
  transition: color var(--ease);
}
.tc-footer__legal a:hover { color: rgba(255,255,255,0.8); }

/* ---- Price Notice Banner ---- */
.price-notice {
  background: var(--amber-tint);
  border-bottom: 2px solid var(--amber);
  padding: 14px 20px;
}
.price-notice__inner { max-width: 720px; margin: 0 auto; }
.price-notice__title {
  font-size: 14px;
  font-weight: 700;
  color: var(--amber-dark);
  margin-bottom: 6px;
}
.price-notice__body {
  font-size: 13px;
  color: var(--label-2);
  line-height: 1.7;
  margin-bottom: 10px;
}
.price-notice__details {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  color: var(--label-2);
  background: rgba(255,255,255,0.7);
  border-left: 3px solid var(--amber);
  padding: 8px 12px;
  border-radius: 0 var(--r-xs) var(--r-xs) 0;
  margin-bottom: 10px;
}
.price-notice__footer { font-size: 12px; color: var(--label-3); line-height: 1.6; }

/* ---- Cards ---- */
.card {
  background: var(--white);
  border-radius: var(--r-md);
  border: 1px solid var(--sep-2);
  box-shadow: var(--shadow-xs);
  overflow: hidden;
  transition: transform var(--ease), box-shadow var(--ease);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.card__body { padding: 22px; }

/* ---- Steps ---- */
.step-list { display: grid; gap: 0; }
.step-item {
  display: flex;
  gap: 18px;
  position: relative;
  padding-bottom: 32px;
}
.step-item:last-child { padding-bottom: 0; }
.step-item:not(:last-child)::before {
  content: '';
  position: absolute;
  left: 23px;
  top: 50px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--brand-light), var(--sep-2));
}
.step-item__num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--brand);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}
.step-item__body { padding-top: 9px; flex: 1; }
.step-item__title { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.step-item__desc { font-size: 14px; color: var(--label-3); line-height: 1.75; }

/* ---- FAQ ---- */
.faq-list { border-top: 1px solid var(--sep-2); }
.faq-item { border-bottom: 1px solid var(--sep-2); }
.faq-item__q {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 18px 0;
  cursor: pointer;
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  font-size: 15px;
  font-weight: 700;
  color: var(--label-1);
  line-height: 1.5;
  -webkit-tap-highlight-color: transparent;
}
.faq-item__q-label {
  color: var(--brand);
  font-weight: 900;
  font-size: 17px;
  flex-shrink: 0;
  margin-top: 1px;
}
.faq-item__q-icon {
  margin-left: auto;
  flex-shrink: 0;
  font-size: 18px;
  color: var(--brand);
  transition: transform 0.25s;
  padding-left: 8px;
}
.faq-item.open .faq-item__q-icon { transform: rotate(180deg); }
.faq-item__a {
  display: none;
  padding: 0 0 18px 34px;
  font-size: 14px;
  color: var(--label-3);
  line-height: 1.85;
}
.faq-item.open .faq-item__a { display: block; }

/* ---- Floating CTA ---- */
.floating-cta {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 50;
  display: flex;
  gap: 10px;
}
.floating-cta a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: var(--r-full);
  padding: 14px 24px;
  font-size: 14px;
  font-weight: 700;
  box-shadow: 0 4px 24px rgba(0,0,0,0.28);
  white-space: nowrap;
  transition: transform var(--ease);
}
.floating-cta a:hover { transform: translateY(-2px); }
.floating-cta__shop { background: var(--brand); color: var(--white); }
.floating-cta__line { background: #06C755; color: var(--white); }
.pb-space { height: 84px; }

/* ---- Pain points ---- */
.pain-section { background: #FFF8F5; border-top: 3px solid #E56B6F; }
.pain-section--brand { background: var(--brand-tint); border-top: 3px solid var(--brand); }

/* ---- Fade animation ---- */
.fade-up { opacity: 0; transform: translateY(18px); transition: opacity 0.45s ease, transform 0.45s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ---- Utilities ---- */
.text-center { text-align: center; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mt-8 { margin-top: 32px; }
.mt-10 { margin-top: 40px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.mb-8 { margin-bottom: 32px; }
.mb-10 { margin-bottom: 40px; }
.gap-1 { gap: 4px; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.flex-wrap { flex-wrap: wrap; }
.grid-2 { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 600px) { .grid-2 { grid-template-columns: repeat(2, 1fr); } }
.grid-3 { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 600px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }
.grid-4 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
@media (min-width: 900px) { .grid-4 { grid-template-columns: repeat(4, 1fr); } }

/* ---- Product link row ---- */
.product-link-row {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-1);
  border-radius: var(--r-sm);
  padding: 14px 16px;
  border: 1px solid var(--sep-2);
  margin-bottom: 10px;
  transition: background var(--ease);
}
.product-link-row:hover { background: var(--brand-tint); }
.product-link-row__icon { font-size: 26px; flex-shrink: 0; }
.product-link-row__title { font-weight: 700; font-size: 15px; color: var(--label-1); }
.product-link-row__sub { font-size: 13px; color: var(--label-3); }
.product-link-row__arrow { margin-left: auto; color: var(--brand); font-weight: 700; font-size: 18px; }

/* ---- Feature card ---- */
.feat-card {
  background: var(--white);
  border-radius: var(--r-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--sep-2);
  transition: transform var(--ease), box-shadow var(--ease);
}
.feat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.feat-card__visual {
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.feat-card__visual img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.35s ease;
}
.feat-card:hover .feat-card__visual img { transform: scale(1.04); }
.feat-card__visual--brand { background: linear-gradient(135deg, var(--brand-dark), var(--brand-mid)); }
.feat-card__visual--amber { background: linear-gradient(135deg, #7A4500, var(--amber)); }
.feat-card__visual--dark  { background: linear-gradient(135deg, #0D2826, #1A5955); }
.feat-card__visual--green { background: linear-gradient(135deg, #054D2E, var(--green)); }
.feat-card__icon-large { font-size: 68px; position: absolute; opacity: 0.22; right: -6px; bottom: -6px; }
.feat-card__icon-center { font-size: 48px; position: relative; z-index: 1; }
.feat-card__body { padding: 22px; }
.feat-card__num {
  font-size: 11px; font-weight: 700; color: var(--brand);
  letter-spacing: 0.1em; margin-bottom: 6px;
}
.feat-card__title { font-size: 17px; font-weight: 700; color: var(--label-1); margin-bottom: 10px; line-height: 1.35; }
.feat-card__desc { font-size: 14px; color: var(--label-3); line-height: 1.75; }

/* ---- Contact cards ---- */
.contact-card {
  border-radius: var(--r-md);
  padding: 30px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.contact-card--line { background: #06C755; color: var(--white); }
.contact-card--shop { background: var(--brand); color: var(--white); }
.contact-card__icon { font-size: 46px; }
.contact-card__title { font-size: 18px; font-weight: 700; }
.contact-card__desc { font-size: 13px; opacity: 0.85; line-height: 1.6; }
.contact-card__btn {
  display: inline-block;
  background: var(--white);
  border-radius: var(--r-full);
  padding: 10px 28px;
  font-size: 14px;
  font-weight: 700;
  margin-top: 4px;
  transition: opacity var(--ease);
}
.contact-card--line .contact-card__btn { color: #06C755; }
.contact-card--shop .contact-card__btn { color: var(--brand); }