/* ============================================
   うんちスキャン LP — style.css
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Brand Colors */
  --color-primary:       #E8785E;
  --color-primary-dark:  #C95C42;
  --color-primary-light: #F5A08A;
  --color-primary-bg:    #FFF8F5;
  --color-primary-soft:  #FFF0EB;

  /* Semantic Colors */
  --color-success:       #5CB885;
  --color-success-bg:    #EDFAF3;
  --color-warning:       #E8A84C;
  --color-warning-bg:    #FEF7EC;
  --color-error:         #D4726A;

  /* Neutral */
  --color-text:          #3D3029;
  --color-text-secondary:#8C7B72;
  --color-text-muted:    #B5A8A0;
  --color-border:        #EDE4DF;
  --color-bg:            #FFF8F5;
  --color-card:          #FFFFFF;
  --color-card-alt:      #FFF0EB;

  /* Layout */
  --container-max:       1120px;
  --section-gap:         96px;
  --card-radius:         20px;
  --btn-radius:          100px;

  /* Shadows */
  --shadow-sm:           0 2px 8px rgba(61, 48, 41, 0.06);
  --shadow-md:           0 4px 24px rgba(61, 48, 41, 0.10);
  --shadow-lg:           0 8px 48px rgba(61, 48, 41, 0.14);

  /* Transitions */
  --transition:          0.24s ease;

  /* Typography */
  --font-heading:        'Noto Sans JP', sans-serif;
  --font-body:           'DM Sans', 'Noto Sans JP', sans-serif;
}

/* ---------- 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-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}
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; }

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 24px;
}

/* ---------- Section ---------- */
.section {
  padding-block: var(--section-gap);
}
.section__header {
  text-align: center;
  margin-bottom: 56px;
}
.section__label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: 4px 14px;
  border-radius: 100px;
  margin-bottom: 16px;
}
.section__title {
  font-family: var(--font-heading);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 900;
  line-height: 1.3;
  color: var(--color-text);
  margin-bottom: 16px;
}
.section__desc {
  font-size: 17px;
  color: var(--color-text-secondary);
  max-width: 520px;
  margin-inline: auto;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 15px;
  padding: 12px 28px;
  border-radius: var(--btn-radius);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  cursor: pointer;
  white-space: nowrap;
  line-height: 1;
  text-decoration: none;
}
.btn:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
}
.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 16px rgba(232, 120, 94, 0.36);
}
.btn--primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(232, 120, 94, 0.44);
}
.btn--secondary {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn--secondary:hover {
  background: var(--color-primary-soft);
  transform: translateY(-2px);
}
.btn--white {
  background: #fff;
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
}
.btn--white:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.btn--lg { font-size: 16px; padding: 16px 36px; }
.btn--sm { font-size: 13px; padding: 9px 20px; }
.btn--full { width: 100%; justify-content: center; }

/* ---------- Badge ---------- */
.badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 100px;
}
.badge--primary { background: var(--color-primary-soft); color: var(--color-primary-dark); }
.badge--success { background: var(--color-success-bg); color: var(--color-success); }
.badge--warm    { background: var(--color-warning-bg); color: var(--color-warning); }

/* ---------- HEADER ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 248, 245, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}
.header.is-scrolled { box-shadow: var(--shadow-md); }
.header__inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 68px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 18px;
  color: var(--color-text);
  flex-shrink: 0;
}
.logo__icon { font-size: 22px; }
.logo--light .logo__text { color: #fff; }
.logo--light .logo__icon { filter: none; }

.nav { margin-left: auto; }
.nav__list { display: flex; gap: 4px; }
.nav__link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: 6px 12px;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}
.nav__link:hover {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}
.header__cta { margin-left: 8px; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  margin-left: auto;
  padding: 8px;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 68px;
  right: 0;
  bottom: 0;
  width: 280px;
  background: var(--color-card);
  box-shadow: var(--shadow-lg);
  padding: 32px 24px;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  overflow-y: auto;
}
.mobile-menu.is-open { transform: translateX(0); }
.mobile-menu__list { display: flex; flex-direction: column; gap: 8px; }
.mobile-menu__link {
  display: block;
  padding: 12px 16px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: 12px;
  transition: background var(--transition);
}
.mobile-menu__link:hover { background: var(--color-primary-soft); color: var(--color-primary); }

/* ---------- HERO ---------- */
.hero {
  position: relative;
  padding-top: calc(68px + 80px);
  padding-bottom: 80px;
  overflow: hidden;
}
.hero__bg-decoration {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.25;
}
.blob--1 {
  width: 560px; height: 560px;
  background: var(--color-primary-light);
  top: -100px; right: -100px;
}
.blob--2 {
  width: 400px; height: 400px;
  background: var(--color-warning);
  bottom: -80px; left: -80px;
}
.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.hero__content { max-width: 560px; }
.hero__badges { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 24px;
}
.hero__title em {
  font-style: normal;
  color: var(--color-primary);
  position: relative;
}
.hero__title em::after {
  content: '';
  position: absolute;
  left: 0; bottom: -4px;
  width: 100%; height: 4px;
  background: var(--color-primary-light);
  border-radius: 2px;
}
.hero__sub {
  font-size: 17px;
  color: var(--color-text-secondary);
  line-height: 1.9;
  margin-bottom: 36px;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* Phone Mockup */
.hero__visual { display: flex; justify-content: center; }
.phone-mockup {
  width: 240px;
  background: #1A1A1A;
  border-radius: 36px;
  padding: 12px;
  box-shadow: 0 24px 80px rgba(0,0,0,0.28), 0 0 0 6px #2A2A2A;
  animation: float 4s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-12px); }
}
.phone-mockup__screen {
  background: var(--color-bg);
  border-radius: 28px;
  overflow: hidden;
  min-height: 400px;
}
.mock-app { padding: 20px 16px; }
.mock-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  font-size: 13px;
  font-weight: 700;
}
.mock-score {
  background: var(--color-success-bg);
  color: var(--color-success);
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 11px;
}
.mock-score strong { font-size: 14px; }
.mock-buttons { display: flex; flex-direction: column; gap: 10px; margin-bottom: 20px; }
.mock-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 14px;
  font-size: 13px;
  font-weight: 700;
  font-family: var(--font-heading);
}
.mock-btn--poop { background: var(--color-primary-soft); color: var(--color-primary-dark); }
.mock-btn--face { background: var(--color-success-bg); color: var(--color-success); }
.mock-btn__icon { font-size: 20px; }
.mock-chart { background: var(--color-card); border-radius: 14px; padding: 12px; }
.mock-chart__title { font-size: 11px; font-weight: 700; margin-bottom: 10px; }
.mock-bars { display: flex; gap: 4px; align-items: flex-end; height: 48px; }
.mock-bar {
  flex: 1;
  background: var(--color-primary-light);
  border-radius: 4px 4px 0 0;
  opacity: 0.6;
  transition: opacity var(--transition);
}
.mock-bar--today { background: var(--color-primary); opacity: 1; }

/* ---------- FEATURES ---------- */
.features { background: var(--color-card); }
.features__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 32px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.feature-card__icon { font-size: 36px; margin-bottom: 16px; }
.feature-card__title {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}
.feature-card__desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  line-height: 1.7;
}
.feature-card__list { display: flex; flex-direction: column; gap: 6px; }
.feature-card__list li {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding-left: 4px;
}
.feature-card__list li::before { content: '✓ '; color: var(--color-success); font-weight: 700; }

/* ---------- HOW IT WORKS ---------- */
.how-it-works { background: var(--color-bg); }
.steps {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  max-width: 900px;
  margin-inline: auto;
}
.step {
  flex: 1;
  text-align: center;
  padding: 36px 24px;
  background: var(--color-card);
  border-radius: var(--card-radius);
  border: 1px solid var(--color-border);
}
.step__number {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  margin-bottom: 12px;
}
.step__icon { font-size: 40px; margin-bottom: 16px; }
.step__title {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}
.step__desc { font-size: 14px; color: var(--color-text-secondary); line-height: 1.7; }
.step__arrow {
  font-size: 24px;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 80px;
  opacity: 0.6;
}

/* ---------- PRICING ---------- */
.pricing { background: var(--color-card); }
.pricing__card {
  max-width: 480px;
  margin-inline: auto;
  background: var(--color-bg);
  border: 2px solid var(--color-primary);
  border-radius: var(--card-radius);
  padding: 48px 40px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}
.pricing__badge {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 4px 16px;
  border-radius: 100px;
  margin-bottom: 24px;
}
.pricing__amount {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin-bottom: 16px;
}
.pricing__currency { font-size: 28px; font-weight: 700; color: var(--color-text-secondary); }
.pricing__number {
  font-family: var(--font-body);
  font-size: 72px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}
.pricing__period { font-size: 18px; color: var(--color-text-secondary); }
.pricing__desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
}
.pricing__features {
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 32px;
}
.pricing__features li { font-size: 15px; }
.pricing__note {
  margin-top: 16px;
  font-size: 12px;
  color: var(--color-text-muted);
}

/* ---------- FAQ ---------- */
.faq { background: var(--color-bg); }
.faq__list { max-width: 720px; margin-inline: auto; display: flex; flex-direction: column; gap: 12px; }
.faq__item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  overflow: hidden;
}
.faq__question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  text-align: left;
  color: var(--color-text);
  transition: background var(--transition);
}
.faq__question:hover { background: var(--color-primary-soft); }
.faq__question[aria-expanded="true"] { background: var(--color-primary-soft); }
.faq__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 400;
  transition: transform var(--transition), background var(--transition);
}
.faq__question[aria-expanded="true"] .faq__icon {
  transform: rotate(45deg);
  background: var(--color-primary);
  color: #fff;
}
.faq__answer { padding: 0 24px 20px; }
.faq__answer p { font-size: 15px; color: var(--color-text-secondary); line-height: 1.8; }

/* ---------- CONTACT ---------- */
.contact { background: var(--color-card); }
.contact__form {
  max-width: 640px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.form__group { display: flex; flex-direction: column; gap: 6px; }
.form__label {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
}
.form__required { color: var(--color-error); margin-left: 2px; }
.form__input,
.form__select,
.form__textarea {
  padding: 12px 16px;
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: 12px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  width: 100%;
}
.form__input:focus,
.form__select:focus,
.form__textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(232, 120, 94, 0.18);
}
.form__textarea { resize: vertical; min-height: 120px; }
.form__notice {
  font-size: 14px;
  text-align: center;
  min-height: 20px;
}
.form__notice.is-success { color: var(--color-success); }
.form__notice.is-error { color: var(--color-error); }

/* ---------- CTA SECTION ---------- */
.cta-section { background: var(--color-primary); }
.cta-block {
  text-align: center;
  padding: 16px 0;
}
.cta-block__emoji { font-size: 56px; margin-bottom: 20px; }
.cta-block__title {
  font-family: var(--font-heading);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 900;
  color: #fff;
  margin-bottom: 12px;
}
.cta-block__desc {
  font-size: 17px;
  color: rgba(255,255,255,0.85);
  margin-bottom: 32px;
}

/* ---------- FOOTER ---------- */
.footer {
  background: var(--color-text);
  color: rgba(255,255,255,0.7);
}
.footer__inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
  padding-top: 64px;
  padding-bottom: 48px;
}
.footer__brand .logo__text { color: #fff; }
.footer__tagline { font-size: 13px; margin-top: 12px; }
.footer__links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.footer__col-title {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.9);
  margin-bottom: 16px;
}
.footer__col ul { display: flex; flex-direction: column; gap: 8px; }
.footer__col a {
  font-size: 14px;
  color: rgba(255,255,255,0.55);
  transition: color var(--transition);
}
.footer__col a:hover { color: #fff; }
.footer__bottom {
  background: rgba(0,0,0,0.2);
  padding-block: 24px;
}
.footer__bottom .container {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  text-align: center;
}
.footer__disclaimer {
  font-size: 12px;
  color: rgba(255,255,255,0.45);
  max-width: 640px;
  line-height: 1.6;
}
.footer__copy { font-size: 12px; color: rgba(255,255,255,0.35); }

/* ---------- BACK TO TOP ---------- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition: opacity var(--transition), transform var(--transition);
  z-index: 900;
}
.back-to-top:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.back-to-top[hidden] { display: none; }

/* ---------- ANIMATIONS ---------- */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children inside grids */
.features__grid .feature-card:nth-child(2) { transition-delay: 0.1s; }
.features__grid .feature-card:nth-child(3) { transition-delay: 0.2s; }
.features__grid .feature-card:nth-child(4) { transition-delay: 0.3s; }
.steps .step:nth-child(3)  { transition-delay: 0.1s; }
.steps .step:nth-child(5)  { transition-delay: 0.2s; }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 1024px) {
  .nav { display: none; }
  .header__cta { display: none; }
  .hamburger { display: flex; }
  .hero__inner { grid-template-columns: 1fr; gap: 48px; }
  .hero__content { max-width: 100%; text-align: center; }
  .hero__badges { justify-content: center; }
  .hero__actions { justify-content: center; }
  .hero__visual { display: none; }
  .features__grid { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr; gap: 40px; }
  .footer__links { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  :root { --section-gap: 64px; }
  .steps { flex-direction: column; align-items: stretch; }
  .step__arrow { display: none; }
  .pricing__card { padding: 32px 24px; }
  .pricing__number { font-size: 56px; }
  .footer__links { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  :root { --section-gap: 48px; }
  .hero { padding-top: calc(68px + 48px); }
  .hero__actions { flex-direction: column; }
  .btn--lg { font-size: 15px; padding: 14px 28px; }
  .footer__links { grid-template-columns: 1fr; }
  .footer__inner { padding-top: 48px; }
}