/* ─────────────────────────────────────────────────────────────
   Tea Groove — Wabi-sabi stylesheet
   Tone: dark, cinematic, Japanese minimal, monochrome
   DNA: Silent Tea Groove × inbound English landing page
───────────────────────────────────────────────────────────── */

/* 0. Custom properties
───────────────────────────────────────────────────────────── */
:root {
  --bg:       #0b0b0b;
  --bg-mid:   #101010;
  --bg-light: #161616;
  --line:     rgba(255,255,255,0.12);
  --white:    #f0ede8;
  --muted:    rgba(240,237,232,0.68);
  --faint:    rgba(240,237,232,0.38);
  --accent:   rgba(240,237,232,0.07);

  --font-sans:  'Inter', sans-serif;
  --font-serif: 'Noto Serif JP', serif;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --trans: 0.7s var(--ease);
}

/* 1. Reset / base
───────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background-color: var(--bg);
  color: var(--white);
  font-family: var(--font-sans);
  font-weight: 300;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a   { text-decoration: none; color: inherit; }
ul  { list-style: none; }

/* 2. Typography helpers
───────────────────────────────────────────────────────────── */
.label {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 2.2rem;
}

/* 3. Layout
───────────────────────────────────────────────────────────── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}
.container--narrow { max-width: 660px; }

.section {
  padding: 10rem 2rem;
  position: relative;
}

/* 4. Buttons
───────────────────────────────────────────────────────────── */
.btn-primary {
  display: inline-block;
  border: 1px solid rgba(240,237,232,0.55);
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 300;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 1rem 2.8rem;
  position: relative;
  overflow: hidden;
  transition: color 0.5s var(--ease);
}
.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--white);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s var(--ease);
  z-index: 0;
}
.btn-primary:hover::before { transform: scaleX(1); }
.btn-primary:hover { color: var(--bg); border-color: var(--white); }
.btn-primary > * { position: relative; z-index: 1; }
.btn-primary-text { position: relative; z-index: 1; }

.btn-primary--large {
  font-size: 0.82rem;
  padding: 1.2rem 3.5rem;
  letter-spacing: 0.22em;
}

.btn-ghost {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 300;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.3s, border-color 0.3s;
}
.btn-ghost:hover {
  color: var(--white);
  border-color: var(--muted);
}

/* ─────────────────────────────────────────────────────────────
   5. NAV
───────────────────────────────────────────────────────────── */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.6rem 2.5rem;
  transition: background 0.6s var(--ease), backdrop-filter 0.6s var(--ease);
}
.site-nav.scrolled {
  background: rgba(11,11,11,0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.nav-logo {
  font-family: var(--font-sans);
  font-weight: 200;
  font-size: 0.82rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--white);
}
.nav-cta {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid transparent;
  transition: color 0.3s, border-color 0.3s;
}
.nav-cta:hover { color: var(--white); border-color: var(--muted); }

/* ─────────────────────────────────────────────────────────────
   6. HERO
───────────────────────────────────────────────────────────── */
.hero {
  position: relative;
  height: 100svh;
  min-height: 640px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding: 0;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center 35%;
  filter: brightness(0.45) saturate(0.3) grayscale(0.5);
  transform: scale(1.04);
  transition: transform 10s var(--ease);
}
.hero:hover .hero-img { transform: scale(1.0); }

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(11,11,11,0.0)  0%,
    rgba(11,11,11,0.15) 40%,
    rgba(11,11,11,0.85) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 0 1.5rem;
  max-width: 660px;
}

.hero-eyebrow {
  font-size: 0.76rem;
  letter-spacing: 0.3em;
  color: var(--muted);
  margin-bottom: 2.8rem;
  font-weight: 300;
  opacity: 0;
  animation: fadeUp 1s 0.4s var(--ease) forwards;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 5.5vw, 4rem);
  font-weight: 200;
  line-height: 1.55;
  letter-spacing: 0.04em;
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeUp 1s 0.65s var(--ease) forwards;
}

.hero-sub {
  font-size: 0.9rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  margin-bottom: 4rem;
  font-weight: 300;
  line-height: 1.9;
  opacity: 0;
  animation: fadeUp 1s 0.85s var(--ease) forwards;
}

.hero-content .btn-primary--large {
  opacity: 0;
  animation: fadeUp 1s 1.05s var(--ease) forwards;
}

/* Scroll hint */
.scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}
.scroll-line {
  display: block;
  width: 1px;
  height: 56px;
  background: linear-gradient(to bottom, transparent, rgba(240,237,232,0.55));
  margin: 0 auto;
  animation: scrollPulse 2.6s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%, 100% { opacity: 0; transform: scaleY(0.5) translateY(-12px); }
  50%       { opacity: 1; transform: scaleY(1) translateY(0); }
}

/* ─────────────────────────────────────────────────────────────
   7. CONCEPT
───────────────────────────────────────────────────────────── */
.concept {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  padding: 0;
  min-height: 80vh;
  align-items: stretch;
}
.concept .container--narrow {
  padding: 10rem 4rem 10rem 6rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: none;
  width: 100%;
}
.concept-body {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2.2vw, 1.45rem);
  font-weight: 200;
  line-height: 1.9;
  letter-spacing: 0.04em;
  margin-bottom: 2.5rem;
  color: var(--white);
}
.concept-divider {
  width: 28px;
  height: 1px;
  background: var(--faint);
  margin-bottom: 2.5rem;
}
.concept-sub {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 2;
  margin-bottom: 2rem;
  letter-spacing: 0.04em;
}
.concept-note {
  font-size: 0.9rem;
  color: var(--muted);
  font-style: italic;
  line-height: 2;
  letter-spacing: 0.04em;
}

.concept-img-wrap {
  position: relative;
  overflow: hidden;
}
.concept-img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: brightness(0.58) saturate(0.3) grayscale(0.6);
  transition: transform 10s var(--ease), filter 0.9s var(--ease);
}
.concept-img-wrap:hover .concept-img {
  transform: scale(1.04);
  filter: brightness(0.68) saturate(0.4) grayscale(0.5);
}
.concept-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(11,11,11,0.5) 0%, transparent 60%);
}

/* ─────────────────────────────────────────────────────────────
   8. FLOW
───────────────────────────────────────────────────────────── */
.flow {
  background: var(--bg-mid);
  text-align: center;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.flow .container { max-width: 1000px; }

.flow-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin-top: 1rem;
  flex-wrap: wrap;
  row-gap: 3rem;
}

.flow-step {
  flex: 1;
  min-width: 160px;
  max-width: 240px;
  padding: 2.8rem 1.5rem;
  border: 1px solid var(--line);
  transition: border-color 0.45s var(--ease), background 0.45s var(--ease);
}
.flow-step:hover {
  border-color: rgba(240,237,232,0.38);
  background: var(--accent);
}

.step-num {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.3em;
  color: var(--faint);
  margin-bottom: 1.6rem;
}
.step-name {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 300;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
  color: var(--white);
  line-height: 1.5;
}
.step-desc {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--faint);
  text-transform: uppercase;
}

.flow-arrow {
  flex: 0 0 auto;
  padding: 0 0.8rem;
  color: var(--faint);
  display: flex;
  align-items: center;
}

/* ─────────────────────────────────────────────────────────────
   9. SILENT TEA GROOVE (about)
───────────────────────────────────────────────────────────── */
.about-stg {
  text-align: center;
  background: var(--bg-light);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.about-stg .container--narrow {
  margin: 0 auto;
  padding: 10rem 2rem;
}
.about-title {
  font-family: var(--font-sans);
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 200;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  margin-bottom: 3.5rem;
  color: var(--white);
}
.about-body {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.8vw, 1.22rem);
  font-weight: 200;
  line-height: 2;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 1.8rem;
}

/* ─────────────────────────────────────────────────────────────
   10. FEATURES
───────────────────────────────────────────────────────────── */
.features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  padding: 0;
  min-height: 70vh;
  align-items: stretch;
}

.features-img-col {
  position: relative;
  overflow: hidden;
}
.features-img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: brightness(0.55) saturate(0.25) grayscale(0.6);
  transition: transform 10s var(--ease), filter 0.9s var(--ease);
}
.features-img-col:hover .features-img {
  transform: scale(1.04);
  filter: brightness(0.65) saturate(0.35) grayscale(0.5);
}
.features-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to left, rgba(11,11,11,0.45) 0%, transparent 65%);
}

.features-text-col {
  padding: 8rem 6rem 8rem 5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--bg);
}

.features-title {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 200;
  line-height: 1.7;
  letter-spacing: 0.04em;
  margin-bottom: 3rem;
  color: var(--white);
}

.features-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.features-list li {
  font-size: 0.84rem;
  color: var(--muted);
  letter-spacing: 0.04em;
  padding-left: 1.6rem;
  position: relative;
  line-height: 1.75;
}
.features-list li::before {
  content: '';
  position: absolute;
  left: 0; top: 0.72em;
  width: 18px; height: 1px;
  background: var(--faint);
}

/* ─────────────────────────────────────────────────────────────
   11. TEA FLIGHT
───────────────────────────────────────────────────────────── */
.tea-flight { padding: 0; }

.tea-flight-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 72vh;
  align-items: stretch;
}

.tea-flight-text {
  padding: 8rem 5rem 8rem 6rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--bg-mid);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.tea-flight-title {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 200;
  line-height: 1.7;
  letter-spacing: 0.04em;
  margin-bottom: 2.5rem;
  color: var(--white);
}

.tea-flight-body {
  font-family: var(--font-serif);
  font-size: clamp(0.95rem, 1.6vw, 1.12rem);
  font-weight: 200;
  line-height: 2;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 1.5rem;
}
.tea-flight-body em {
  color: var(--white);
  font-style: italic;
}

.tea-flight-note {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--faint);
  margin-top: 0.5rem;
}

.tea-flight-img-wrap {
  position: relative;
  overflow: hidden;
}
.tea-flight-img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: brightness(0.52) saturate(0.25) grayscale(0.55);
  transition: transform 10s var(--ease), filter 0.9s var(--ease);
}
.tea-flight-img-wrap:hover .tea-flight-img {
  transform: scale(1.04);
  filter: brightness(0.62) saturate(0.4) grayscale(0.45);
}
.tea-flight-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(11,11,11,0.4) 0%, transparent 60%);
}

/* ─────────────────────────────────────────────────────────────
   12. FOR WHOM
───────────────────────────────────────────────────────────── */
.for-whom {
  text-align: center;
  background: var(--bg-light);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.for-whom .container--narrow {
  margin: 0 auto;
  padding: 10rem 2rem;
}

.for-list {
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
  margin-top: 0.5rem;
}
.for-list li {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  font-weight: 200;
  letter-spacing: 0.06em;
  color: var(--muted);
  line-height: 1.85;
  transition: color 0.35s var(--ease);
  cursor: default;
}
.for-list li:hover { color: var(--white); }

/* ─────────────────────────────────────────────────────────────
   13. REVIEWS
───────────────────────────────────────────────────────────── */
.reviews {
  background: var(--bg);
  border-top: 1px solid var(--line);
}
.reviews .container { max-width: 1100px; }

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  margin-top: 1rem;
}

.review {
  padding: 3.5rem 2.5rem;
  background: var(--bg);
  transition: background 0.4s var(--ease);
}
.review:hover { background: var(--bg-light); }

.review-text {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 200;
  font-style: italic;
  line-height: 1.9;
  letter-spacing: 0.03em;
  color: var(--muted);
  margin-bottom: 2rem;
}

.review-author {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--faint);
}

/* ─────────────────────────────────────────────────────────────
   14. INFO
───────────────────────────────────────────────────────────── */
.info {
  background: var(--bg-mid);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.info .container { max-width: 760px; }

.info-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  margin-top: 1rem;
  border: 1px solid var(--line);
}
.info-item {
  padding: 3rem 2rem;
  text-align: center;
  background: var(--bg-mid);
  transition: background 0.4s var(--ease);
}
.info-item:hover { background: var(--accent); }

.info-key {
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--faint);
  font-weight: 400;
  margin-bottom: 1.2rem;
}
.info-val {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 300;
  letter-spacing: 0.06em;
  color: var(--white);
}

/* ─────────────────────────────────────────────────────────────
   15. CTA
───────────────────────────────────────────────────────────── */
.cta {
  text-align: center;
  padding: 13rem 2rem;
  background: var(--bg);
  position: relative;
  overflow: hidden;
}
.cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse 55% 45% at 50% 50%,
    rgba(240,237,232,0.055) 0%,
    transparent 68%
  );
  pointer-events: none;
}
.cta-inner {
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.cta-copy {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3.5vw, 2.8rem);
  font-weight: 200;
  letter-spacing: 0.08em;
  line-height: 1.65;
  margin-bottom: 4rem;
  color: var(--white);
}
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: center;
  align-items: center;
}

/* ─────────────────────────────────────────────────────────────
   16. CONTACT
───────────────────────────────────────────────────────────── */
.contact {
  background: var(--bg-light);
  border-top: 1px solid var(--line);
}
.contact .container--narrow { margin: 0 auto; }

.contact-title {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.5vw, 1.9rem);
  font-weight: 200;
  line-height: 1.65;
  letter-spacing: 0.04em;
  margin-bottom: 3.5rem;
  color: var(--white);
}

.contact-form { display: flex; flex-direction: column; gap: 1.5rem; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.form-field label {
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--faint);
  font-weight: 400;
}
.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  padding: 0.9rem 1rem;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 300;
  letter-spacing: 0.04em;
  transition: border-color 0.35s var(--ease);
  appearance: none;
  border-radius: 0;
}
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: rgba(240,237,232,0.5);
}
.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--faint);
}
.form-field select option { background: var(--bg-light); color: var(--white); }
.form-field textarea { resize: vertical; }

.contact-submit {
  align-self: flex-start;
  margin-top: 0.5rem;
  cursor: pointer;
  background: none;
  font-family: var(--font-sans);
}
.contact-note {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--faint);
  margin-top: 0.5rem;
}

.contact-success { text-align: center; padding: 4rem 0; }
.contact-success-msg {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 200;
  letter-spacing: 0.08em;
  color: var(--muted);
  line-height: 1.9;
}

/* ─────────────────────────────────────────────────────────────
   17. FOOTER
───────────────────────────────────────────────────────────── */
.site-footer {
  padding: 3rem 2.5rem;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg);
}
.footer-logo {
  font-size: 0.76rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  font-weight: 300;
  color: var(--faint);
}
.footer-copy {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: rgba(240,237,232,0.3);
}

/* ─────────────────────────────────────────────────────────────
   18. Scroll-in animations
───────────────────────────────────────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.95s var(--ease), transform 0.95s var(--ease);
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-up.delay-1 { transition-delay: 0.10s; }
.fade-up.delay-2 { transition-delay: 0.20s; }
.fade-up.delay-3 { transition-delay: 0.30s; }
.fade-up.delay-4 { transition-delay: 0.42s; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(22px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─────────────────────────────────────────────────────────────
   19. Responsive
───────────────────────────────────────────────────────────── */
@media (max-width: 960px) {
  .concept,
  .features,
  .tea-flight-inner {
    grid-template-columns: 1fr;
  }
  .concept .container--narrow { padding: 7rem 2rem 5rem; }
  .concept-img-wrap { height: 55vw; min-height: 280px; }

  .features-img-col  { height: 55vw; min-height: 280px; }
  .features-text-col { padding: 5rem 2rem; }

  .tea-flight-img-wrap { height: 55vw; min-height: 280px; order: -1; }
  .tea-flight-text { padding: 5rem 2rem; border: none; border-top: 1px solid var(--line); }

  .reviews-grid { grid-template-columns: 1fr; }
  .info-grid    { grid-template-columns: repeat(2, 1fr); }

  .flow-steps   { flex-direction: column; align-items: center; }
  .flow-arrow   { transform: rotate(90deg); }
}

@media (max-width: 600px) {
  .section { padding: 7rem 1.5rem; }
  .site-nav { padding: 1.3rem 1.5rem; }
  .hero-title { font-size: 2rem; }
  .cta { padding: 9rem 1.5rem; }
  .cta-actions { flex-direction: column; gap: 2rem; }
  .concept .container--narrow { padding: 6rem 1.5rem; }
  .form-row { grid-template-columns: 1fr; }
  .info-grid { grid-template-columns: 1fr 1fr; }
  .site-footer { flex-direction: column; gap: 1rem; text-align: center; }
}

@media (max-width: 400px) {
  .info-grid { grid-template-columns: 1fr; }
}