/* ============================================
   YOTEI SAUNA — STYLESHEET
   ============================================ */

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

:root {
  --color-bg:        #0e0b08;
  --color-surface:   #16120d;
  --color-surface-2: #1e1810;
  --color-border:    #2e2518;
  --color-text:      #e8dfd0;
  --color-text-muted:#9a8e7e;
  --color-accent:    #c4873a;
  --color-accent-lt: #d9a05a;
  --color-cream:     #f5ede0;
  --color-charcoal:  #3a3530;
  --font-serif:      'Cormorant Garamond', Georgia, serif;
  --font-sans:       'Inter', system-ui, sans-serif;
  --max-w:           1200px;
  --radius:          4px;
  --transition:      0.25s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

/* ============================================
   LAYOUT UTILITIES
   ============================================ */

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 5rem;
}

.section-eyebrow {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 300;
  line-height: 1.2;
  color: var(--color-cream);
  margin-bottom: 1.25rem;
}

.section-sub {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}
.btn--primary:hover {
  background: var(--color-accent-lt);
  border-color: var(--color-accent-lt);
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}
.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border-color: rgba(255,255,255,0.15);
}
.btn--ghost:hover {
  color: var(--color-text);
  border-color: rgba(255,255,255,0.3);
}

.btn--sm {
  padding: 0.55rem 1.25rem;
  font-size: 0.72rem;
}

/* ============================================
   NAVIGATION
   ============================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.25rem 0;
  transition: background var(--transition), box-shadow var(--transition);
}

.nav.scrolled {
  background: rgba(14, 11, 8, 0.95);
  box-shadow: 0 1px 0 var(--color-border);
  backdrop-filter: blur(10px);
}

.nav__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav__logo {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 300;
  font-style: italic;
  color: var(--color-cream);
  letter-spacing: 0.05em;
  flex-shrink: 0;
}

.nav__links {
  display: flex;
  gap: 2rem;
  margin-left: auto;
}

.nav__links a {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.nav__links a:hover {
  color: var(--color-text);
}

/* ============================================
   HERO
   ============================================ */

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 65% 50%, rgba(196, 135, 58, 0.07) 0%, transparent 60%),
              radial-gradient(ellipse at 15% 70%, rgba(196, 135, 58, 0.04) 0%, transparent 50%),
              linear-gradient(180deg, var(--color-bg) 0%, #120e09 100%);
}

.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 80px, rgba(196,135,58,0.02) 80px, rgba(196,135,58,0.02) 81px),
    repeating-linear-gradient(90deg, transparent, transparent 80px, rgba(196,135,58,0.02) 80px, rgba(196,135,58,0.02) 81px);
}

.hero__inner {
  position: relative;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 8rem 2rem 5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero__content {
  max-width: 560px;
}

.hero__eyebrow {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 5vw, 5rem);
  font-weight: 300;
  line-height: 1.1;
  color: var(--color-cream);
  margin-bottom: 1.75rem;
}

.hero__title em {
  font-style: italic;
  color: var(--color-accent-lt);
}

.hero__sub {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

.hero__cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero__visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero__kanji {
  font-family: 'Hiragino Mincho ProN', 'Yu Mincho', 'MS Mincho', serif;
  font-size: clamp(10rem, 18vw, 18rem);
  font-weight: 300;
  color: transparent;
  -webkit-text-stroke: 1px rgba(196, 135, 58, 0.2);
  line-height: 1;
  user-select: none;
  background: linear-gradient(135deg, rgba(196,135,58,0.25), rgba(196,135,58,0.05));
  -webkit-background-clip: text;
  background-clip: text;
  animation: kanjiFloat 6s ease-in-out infinite;
}

@keyframes kanjiFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.hero__scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  justify-content: center;
}

.hero__scroll span {
  display: block;
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.2); }
}

/* ============================================
   JAPAN SECTION
   ============================================ */

.japan-section {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 8rem 0;
}

.japan-section__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: center;
}

.japan-section__text .section-title {
  text-align: left;
  margin-bottom: 1.5rem;
}

.japan-section__text p {
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
  line-height: 1.8;
  font-size: 0.95rem;
}

.japan-visual-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.japan-stat {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.japan-stat:last-child {
  grid-column: 1 / -1;
}

.japan-stat__num {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--color-accent);
  line-height: 1;
}

.japan-stat:last-child .japan-stat__num {
  font-family: 'Hiragino Mincho ProN', 'Yu Mincho', 'MS Mincho', serif;
  font-size: 3.5rem;
}

.japan-stat__label {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

/* ============================================
   BENEFITS
   ============================================ */

.benefits {
  padding: 8rem 0;
}

.benefits__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2px;
}

.benefit-card {
  background: var(--color-surface);
  padding: 2.5rem;
  border: 1px solid var(--color-border);
  transition: border-color var(--transition), background var(--transition);
}

.benefit-card:hover {
  border-color: rgba(196, 135, 58, 0.3);
  background: var(--color-surface-2);
}

.benefit-card__icon {
  width: 44px;
  height: 44px;
  background: rgba(196, 135, 58, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.benefit-card__icon svg {
  width: 22px;
  height: 22px;
  fill: var(--color-accent);
}

.benefit-card h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--color-cream);
  margin-bottom: 0.75rem;
}

.benefit-card p {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ============================================
   WOOL SECTION
   ============================================ */

.wool-section {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 8rem 0;
}

.wool-section__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: center;
}

.wool-section__text .section-title {
  text-align: left;
  margin-bottom: 1.5rem;
}

.wool-section__text p {
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  line-height: 1.8;
}

.wool-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.wool-list li {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  padding-left: 1.25rem;
  position: relative;
  line-height: 1.7;
}

.wool-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

.wool-list strong {
  color: var(--color-text);
  font-weight: 500;
}

.wool-visual-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 1.5rem;
}

.wool-stat {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.wool-stat:last-child {
  grid-column: 1 / -1;
}

.wool-stat__num {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 300;
  color: var(--color-accent);
  line-height: 1;
}

.wool-stat__label {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

/* ============================================
   CRAFT / STORY
   ============================================ */

.craft {
  padding: 8rem 0;
}

.craft__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: center;
}

.craft__image-block {
  aspect-ratio: 4/5;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.craft__image-block::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(196,135,58,0.06) 0%, transparent 70%);
}

.craft__image-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  color: var(--color-accent);
  position: relative;
  z-index: 1;
}

.craft__kanji {
  font-family: 'Hiragino Mincho ProN', 'Yu Mincho', 'MS Mincho', serif;
  font-size: 8rem;
  font-weight: 300;
  color: transparent;
  -webkit-text-stroke: 1px rgba(196, 135, 58, 0.35);
  line-height: 1;
  user-select: none;
}

.craft__image-inner p {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.craft__text .section-title {
  text-align: left;
  margin-bottom: 1.5rem;
}

.craft__text p {
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.craft__text .btn {
  margin-top: 1rem;
}

/* ============================================
   SHOP
   ============================================ */

.shop {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 8rem 0;
}

.shop__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.product-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}

.product-card__image {
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.product-card__image--natural {
  background: linear-gradient(135deg, #2a2018, #3a2e1c);
  color: #c4a76a;
}

.product-card__image--charcoal {
  background: linear-gradient(135deg, #1a1a1a, #2a2520);
  color: #8a8a8a;
}

.product-card__image--cream {
  background: linear-gradient(135deg, #2e2416, #3e301e);
  color: #d4b87a;
}

.product-card__badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background: var(--color-accent);
  color: var(--color-bg);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.3rem 0.7rem;
  border-radius: 2px;
}

.product-card__badge--new {
  background: #4a8a5a;
}

.product-card__img-inner {
  width: 60%;
  height: 60%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-card__img-inner svg {
  width: 100%;
  height: 100%;
}

.product-card__body {
  padding: 1.75rem;
}

.product-card__name {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--color-cream);
  margin-bottom: 0.75rem;
}

.product-card__desc {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.product-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.product-card__price {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 300;
  color: var(--color-cream);
}

/* ============================================
   HOW TO USE
   ============================================ */

.howto {
  padding: 8rem 0;
}

.howto__steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 3rem;
  counter-reset: steps;
}

.howto__step {
  position: relative;
  padding-top: 1rem;
}

.howto__step-num {
  font-family: var(--font-serif);
  font-size: 4rem;
  font-weight: 300;
  color: rgba(196, 135, 58, 0.15);
  line-height: 1;
  margin-bottom: 1rem;
}

.howto__step h4 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--color-cream);
  margin-bottom: 0.75rem;
}

.howto__step p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ============================================
   TESTIMONIALS
   ============================================ */

.testimonials {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 8rem 0;
}

.testimonials__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.testimonial {
  padding: 2.5rem;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
}

.testimonial__stars {
  color: var(--color-accent);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  margin-bottom: 1.25rem;
}

.testimonial__text {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-style: italic;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.testimonial__author {
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

/* ============================================
   FAQ
   ============================================ */

.faq {
  padding: 8rem 0;
}

.faq__list {
  max-width: 720px;
  margin: 0 auto;
}

.faq__item {
  border-bottom: 1px solid var(--color-border);
}

.faq__item summary {
  padding: 1.5rem 0;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-cream);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  user-select: none;
}

.faq__item summary::-webkit-details-marker { display: none; }

.faq__item summary::after {
  content: '+';
  font-family: var(--font-sans);
  font-size: 1.2rem;
  font-weight: 300;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform var(--transition);
}

.faq__item[open] summary::after {
  transform: rotate(45deg);
}

.faq__item p {
  padding: 0 0 1.75rem;
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ============================================
   NEWSLETTER
   ============================================ */

.newsletter {
  background: var(--color-accent);
  padding: 5rem 0;
}

.newsletter__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
  flex-wrap: wrap;
}

.newsletter__text h2 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 300;
  color: var(--color-bg);
  margin-bottom: 0.4rem;
}

.newsletter__text p {
  font-size: 0.9rem;
  color: rgba(14,11,8,0.7);
}

.newsletter__form {
  display: flex;
  gap: 0;
  flex: 0 0 auto;
}

.newsletter__form input {
  background: rgba(0,0,0,0.15);
  border: 1px solid rgba(0,0,0,0.2);
  border-right: none;
  color: var(--color-bg);
  padding: 0.75rem 1.25rem;
  font-size: 0.88rem;
  font-family: var(--font-sans);
  border-radius: var(--radius) 0 0 var(--radius);
  min-width: 260px;
  outline: none;
}

.newsletter__form input::placeholder {
  color: rgba(14,11,8,0.5);
}

.newsletter__form .btn {
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--color-bg);
  color: var(--color-accent);
  border-color: var(--color-bg);
}

.newsletter__form .btn:hover {
  background: #1e1810;
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: 6rem;
  padding-top: 5rem;
  padding-bottom: 5rem;
}

.footer__logo {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 300;
  font-style: italic;
  color: var(--color-cream);
  display: block;
  margin-bottom: 1rem;
}

.footer__brand p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.footer__social {
  display: flex;
  gap: 1rem;
}

.footer__social a {
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition);
}

.footer__social a:hover {
  border-color: var(--color-accent);
}

.footer__social svg {
  width: 16px;
  height: 16px;
  fill: var(--color-text-muted);
}

.footer__links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.footer__col h4 {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: 1.25rem;
}

.footer__col a {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.7rem;
  transition: color var(--transition);
}

.footer__col a:hover {
  color: var(--color-text);
}

.footer__bottom {
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 0;
}

.footer__bottom .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer__bottom p {
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.footer__bottom-links {
  display: flex;
  gap: 1.5rem;
}

.footer__bottom-links a {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.footer__bottom-links a:hover {
  color: var(--color-text);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 960px) {
  .hero__inner {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 8rem 2rem 4rem;
  }

  .hero__visual {
    display: none;
  }

  .hero__content {
    max-width: 100%;
  }

  .wool-section__inner,
  .craft__inner,
  .japan-section__inner {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .craft__image-block {
    aspect-ratio: 3/2;
  }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .nav__links { display: none; }

  .benefits__grid {
    grid-template-columns: 1fr;
  }

  .newsletter__form input {
    min-width: 180px;
  }

  .footer__links {
    grid-template-columns: 1fr 1fr;
  }

  .wool-visual-block,
  .japan-visual-block {
    grid-template-columns: 1fr 1fr;
  }

  .wool-stat:last-child,
  .japan-stat:last-child {
    grid-column: auto;
  }
}

@media (max-width: 480px) {
  .hero__cta {
    flex-direction: column;
  }
  .hero__cta .btn {
    text-align: center;
  }

  .newsletter__form {
    flex-direction: column;
    width: 100%;
  }
  .newsletter__form input {
    border-right: 1px solid rgba(0,0,0,0.2);
    border-bottom: none;
    border-radius: var(--radius) var(--radius) 0 0;
    min-width: unset;
    width: 100%;
  }
  .newsletter__form .btn {
    border-radius: 0 0 var(--radius) var(--radius);
    text-align: center;
  }

  .footer__links {
    grid-template-columns: 1fr;
  }
}