/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg:         #fafaf8;
  --color-bg-off:     #f3f1ed;
  --color-bg-dark:    #1e1c1a;
  --color-text:       #1e1c1a;
  --color-text-sub:   #5a5550;
  --color-text-light: #f0ece5;
  --color-accent:     #b5221e;
  --color-accent-mid: #c93a36;
  --color-border:     #d8d4ce;
  --color-border-light: rgba(255,255,255,0.15);

  --font-serif:  'Noto Serif JP', 'Georgia', serif;
  --font-sans:   'Noto Sans JP', 'Hiragino Kaku Gothic ProN', sans-serif;

  --max-width:        1100px;
  --narrow-width:     720px;
  --section-pad-v:    100px;
  --section-pad-v-sm: 64px;
}

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

/* ============================================================
   UTILITY
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

.container--narrow {
  max-width: var(--narrow-width);
}

.sp-only { display: none; }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background-color: var(--color-bg);
  padding: 120px 32px 80px;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--color-accent);
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0; right: 0;
  width: 380px;
  height: 380px;
  background: radial-gradient(circle, rgba(181,34,30,0.04) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  max-width: var(--narrow-width);
  margin: 0 auto;
  width: 100%;
}

.hero__eyebrow {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 300;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 32px;
}

.hero__headline {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--color-text);
  margin-bottom: 40px;
}

.hero__sub {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 300;
  color: var(--color-text-sub);
  line-height: 2;
  margin-bottom: 48px;
}

.hero__line {
  width: 48px;
  height: 1px;
  background: var(--color-accent);
}

.hero__scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.hero__scroll-hint span {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  color: var(--color-text-sub);
  text-transform: lowercase;
}

.hero__scroll-bar {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--color-border), transparent);
  animation: scrollBar 2s ease-in-out infinite;
}

@keyframes scrollBar {
  0%   { transform: scaleY(0); transform-origin: top; }
  50%  { transform: scaleY(1); transform-origin: top; }
  51%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ============================================================
   SECTION BASE
   ============================================================ */
.section {
  padding: var(--section-pad-v) 32px;
}

.section--light {
  background-color: var(--color-bg);
}

.section--off-white {
  background-color: var(--color-bg-off);
}

.section--family {
  background-color: #2a2623;
  color: var(--color-text-light);
}

.section--cta {
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

/* ============================================================
   CHAPTER TITLE
   ============================================================ */
.section__chapter-title {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 3vw, 1.75rem);
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--color-text);
  margin-bottom: 48px;
  display: flex;
  align-items: baseline;
  gap: 20px;
}

.section__chapter-title--light {
  color: var(--color-text-light);
}

.chapter-num {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 300;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  flex-shrink: 0;
}

/* ============================================================
   BODY TEXT
   ============================================================ */
.section__lead {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  font-weight: 400;
  line-height: 2;
  color: var(--color-text);
  margin-bottom: 32px;
}

.section__body {
  font-size: 1rem;
  font-weight: 300;
  line-height: 2.1;
  color: var(--color-text);
  margin-bottom: 28px;
}

.section__body--light {
  color: rgba(240, 236, 229, 0.85);
}

.section__body--large {
  font-family: var(--font-serif);
  font-size: 1.2rem;
}

.section__body--small {
  font-size: 0.95rem;
  color: var(--color-text-sub);
}

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

/* ============================================================
   QUOTE
   ============================================================ */
.section__quote {
  border-left: 2px solid var(--color-accent);
  padding: 20px 0 20px 28px;
  margin: 40px 0;
  font-size: 1.05rem;
  font-weight: 300;
  line-height: 2;
  color: var(--color-text-sub);
}

.section__quote--serif {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-text);
}

/* ============================================================
   WORD LIST / SCENE LIST
   ============================================================ */
.word-list,
.scene-list,
.thinking-list {
  list-style: none;
  margin: 24px 0 32px 0;
  padding: 0;
}

.word-list li,
.scene-list li,
.thinking-list li {
  font-size: 1rem;
  font-weight: 300;
  line-height: 2;
  color: var(--color-text-sub);
  padding-left: 16px;
  position: relative;
}

.word-list li::before,
.scene-list li::before,
.thinking-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 0.8rem;
}

/* ============================================================
   STATEMENT BLOCK
   ============================================================ */
.statement-block {
  margin: 48px 0;
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.statement-block__text {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  font-weight: 400;
  line-height: 2;
  color: var(--color-text);
}

.statement-block__text--accent {
  color: var(--color-accent);
}

/* ============================================================
   INSIGHT BLOCK
   ============================================================ */
.insight-block {
  padding: 48px 0;
  text-align: center;
}

.insight-block__text {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2.8vw, 1.4rem);
  font-weight: 400;
  line-height: 1.9;
  color: var(--color-text);
}

.insight-block__text strong {
  color: var(--color-accent);
  font-weight: 500;
}

/* ============================================================
   SITE PHOTOS (placeholder)
   ============================================================ */
.site-photos {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 48px 0;
}

.site-photo {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background-color: #d0ccc6;
}

.site-photo--zairaigata {
  background: linear-gradient(135deg, #c8c4bc 0%, #a8a49c 100%);
}

.site-photo--rasugata {
  background: linear-gradient(135deg, #b8b4ac 0%, #989490 100%);
}

.site-photo__inner {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 20px;
  background: linear-gradient(to top, rgba(30,28,26,0.7), transparent);
}

.site-photo__label {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 400;
  color: #fff;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.site-photo__desc {
  font-size: 0.75rem;
  font-weight: 300;
  color: rgba(255,255,255,0.75);
  letter-spacing: 0.05em;
}

/* ============================================================
   METHOD COMPARE
   ============================================================ */
.method-compare {
  display: flex;
  align-items: center;
  gap: 24px;
  margin: 40px 0;
  padding: 40px;
  background-color: var(--color-bg-off);
  border: 1px solid var(--color-border);
}

.section--off-white .method-compare {
  background-color: var(--color-bg);
}

.method-compare__item {
  flex: 1;
  text-align: center;
}

.method-compare__title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: 12px;
  letter-spacing: 0.06em;
}

.method-compare__body {
  font-size: 0.9rem;
  font-weight: 300;
  line-height: 1.9;
  color: var(--color-text-sub);
}

.method-compare__body strong {
  color: var(--color-text);
  font-weight: 500;
}

.method-compare__divider {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 300;
  color: var(--color-accent);
  flex-shrink: 0;
}

/* ============================================================
   HIGHLIGHT BOX
   ============================================================ */
.highlight-box {
  margin: 40px 0;
  padding: 36px 40px;
  border-left: 3px solid var(--color-accent);
  background-color: var(--color-bg-off);
}

.section--off-white .highlight-box {
  background-color: var(--color-bg);
}

.highlight-box p {
  font-size: 0.95rem;
  font-weight: 300;
  line-height: 2;
  color: var(--color-text-sub);
  margin-bottom: 8px;
}

.highlight-box p:last-child { margin-bottom: 0; }

.highlight-box strong {
  color: var(--color-text);
  font-weight: 500;
}

.highlight-box__accent {
  font-family: var(--font-serif);
  font-size: 1rem !important;
  color: var(--color-accent) !important;
  font-weight: 400 !important;
  margin-top: 16px !important;
}

/* ============================================================
   AGE STAT
   ============================================================ */
.age-stat {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 40px 0 16px;
}

.age-stat__num {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 300;
  color: var(--color-text);
  line-height: 1;
  letter-spacing: -0.02em;
}

.age-stat__unit {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--color-text-sub);
}

.age-stat__label {
  font-size: 0.75rem;
  font-weight: 300;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-left: 8px;
}

/* ============================================================
   GENERATION GRID
   ============================================================ */
.generation-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 40px 0;
}

.generation-grid__item {
  text-align: center;
  padding: 28px 16px;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg);
}

.section--off-white .generation-grid__item {
  background-color: var(--color-bg-off);
}

.generation-grid__icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: #fff;
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 400;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.generation-grid__item p {
  font-size: 0.85rem;
  font-weight: 300;
  line-height: 1.8;
  color: var(--color-text-sub);
}

/* ============================================================
   CONDITIONS GRID
   ============================================================ */
.conditions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background-color: var(--color-border);
  border: 1px solid var(--color-border);
  margin: 40px 0;
}

.conditions-grid__item {
  background-color: var(--color-bg);
  padding: 28px 24px;
}

.conditions-grid__label {
  font-size: 0.72rem;
  font-weight: 300;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: 10px;
}

.conditions-grid__value {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.2;
  margin-bottom: 8px;
}

.conditions-grid__unit {
  font-size: 0.85rem;
  font-weight: 300;
  color: var(--color-text-sub);
}

.conditions-grid__note {
  font-size: 0.75rem;
  font-weight: 300;
  color: var(--color-text-sub);
  line-height: 1.6;
}

/* ============================================================
   CHAIN LOGIC
   ============================================================ */
.chain-logic {
  margin: 40px 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
}

.chain-logic__item {
  padding: 18px 28px;
  border: 1px solid var(--color-border);
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--color-text);
  background-color: var(--color-bg);
  width: 100%;
}

.section--off-white .chain-logic__item {
  background-color: var(--color-bg-off);
}

.chain-logic__item:first-child {
  border-left: 3px solid var(--color-accent);
}

.chain-logic__arrow {
  font-size: 1.2rem;
  color: var(--color-accent);
  padding: 4px 28px;
  font-weight: 300;
}

/* ============================================================
   FAMILY SECTION
   ============================================================ */
.family-concerns {
  list-style: none;
  margin: 24px 0 32px;
  padding: 0;
}

.family-concerns li {
  font-size: 1rem;
  font-weight: 300;
  line-height: 2;
  color: rgba(240, 236, 229, 0.7);
  padding-left: 16px;
  position: relative;
}

.family-concerns li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-accent-mid);
  font-size: 0.8rem;
}

.family-answers {
  margin: 40px 0;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--color-border-light);
}

.family-answers__item {
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.family-answers__q {
  font-size: 0.85rem;
  font-weight: 300;
  color: rgba(240, 236, 229, 0.55);
  margin-bottom: 6px;
}

.family-answers__a {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-light);
  line-height: 1.8;
}

.family-closing {
  margin-top: 48px;
  padding-top: 40px;
  border-top: 1px solid var(--color-border-light);
}

.family-closing p {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 300;
  color: rgba(240, 236, 229, 0.75);
  line-height: 2.2;
}

.family-closing__accent {
  color: var(--color-text-light) !important;
  font-weight: 400 !important;
  margin-top: 16px;
}

/* ============================================================
   CTA SECTION
   ============================================================ */
.cta__lead {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  font-weight: 400;
  line-height: 2;
  color: var(--color-text);
  margin-bottom: 40px;
}

.cta__choice {
  margin: 40px 0;
  padding: 40px;
  background-color: var(--color-bg-off);
  border: 1px solid var(--color-border);
}

.cta__choice-a {
  font-size: 1rem;
  font-weight: 300;
  color: var(--color-text-sub);
  line-height: 2;
  margin-bottom: 12px;
}

.cta__choice-b {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--color-text);
  line-height: 2;
}

.cta__body {
  font-size: 1rem;
  font-weight: 300;
  color: var(--color-text-sub);
  line-height: 2;
  margin-bottom: 40px;
}

.cta__if-block {
  margin: 32px 0;
  padding-left: 24px;
  border-left: 2px solid var(--color-border);
}

.cta__if-block p {
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--color-text-sub);
  line-height: 2.2;
}

.cta__invite {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 3vw, 1.75rem);
  font-weight: 400;
  color: var(--color-text);
  margin: 48px 0 32px;
  letter-spacing: 0.04em;
}

.cta__tagline {
  margin: 32px 0 56px;
}

.cta__tagline p {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 300;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  line-height: 1.5;
}

.cta__button-wrap {
  text-align: center;
  margin-top: 48px;
}

.cta__button {
  display: inline-block;
  padding: 18px 56px;
  background-color: var(--color-accent);
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-decoration: none;
  transition: background-color 0.25s ease, transform 0.2s ease;
}

.cta__button:hover {
  background-color: var(--color-accent-mid);
  transform: translateY(-1px);
}

.cta__button-note {
  margin-top: 16px;
  font-size: 0.8rem;
  font-weight: 300;
  color: var(--color-text-sub);
  letter-spacing: 0.05em;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  padding: 40px 32px;
  background-color: var(--color-bg-off);
  border-top: 1px solid var(--color-border);
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer__company {
  font-size: 0.8rem;
  font-weight: 300;
  color: var(--color-text-sub);
  letter-spacing: 0.08em;
}

.footer__copy {
  font-size: 0.72rem;
  font-weight: 300;
  color: var(--color-border);
  letter-spacing: 0.05em;
}

/* ============================================================
   SECTION LEAD BLOCK
   ============================================================ */
.section__lead-block {
  padding-top: 16px;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  :root {
    --section-pad-v: 64px;
  }

  .sp-only { display: inline; }

  .hero {
    padding: 100px 24px 80px;
  }

  .container,
  .section {
    padding-left: 24px;
    padding-right: 24px;
  }

  .site-photos {
    grid-template-columns: 1fr;
  }

  .method-compare {
    flex-direction: column;
    padding: 28px 24px;
    gap: 16px;
  }

  .method-compare__divider {
    transform: rotate(90deg);
  }

  .generation-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

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

  .chain-logic__item {
    padding: 16px 20px;
  }

  .cta__choice {
    padding: 28px 24px;
  }

  .footer .container {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .highlight-box {
    padding: 28px 24px;
  }
}

@media (max-width: 480px) {
  .conditions-grid {
    grid-template-columns: 1fr;
  }

  .hero__headline {
    font-size: 1.8rem;
  }

  .cta__button {
    padding: 16px 36px;
    width: 100%;
    text-align: center;
  }
}

/* ============================================================
   SCROLL FADE-IN ANIMATION
   ============================================================ */
.js-fade {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.js-fade.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger for list items */
.js-fade.word-list,
.js-fade.scene-list,
.js-fade.thinking-list {
  transition-delay: 0.1s;
}

.js-fade.statement-block {
  transition-delay: 0.15s;
}

.js-fade.conditions-grid,
.js-fade.generation-grid {
  transition-delay: 0.05s;
}

/* ============================================================
   ADDITIONAL REFINEMENTS
   ============================================================ */

/* Subtle top border on off-white sections */
.section--off-white + .section--light,
.section--light + .section--off-white {
  border-top: none;
}

/* Improve hero on large screens */
@media (min-width: 1200px) {
  .hero__headline {
    font-size: 3.4rem;
  }
}

/* Ensure the CTA tagline has proper letter spacing */
.cta__tagline p {
  letter-spacing: 0.12em;
}

/* Make the site-photo placeholders look more intentional */
.site-photo--zairaigata::before,
.site-photo--rasugata::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 8px,
    rgba(255,255,255,0.04) 8px,
    rgba(255,255,255,0.04) 16px
  );
}

/* Conditions grid hover effect */
.conditions-grid__item {
  transition: background-color 0.2s ease;
}

.conditions-grid__item:hover {
  background-color: #f8f6f2;
}

/* Family section chapter title spacing */
.section--family .section__chapter-title {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border-light);
}

/* Smooth underline for CTA button area */
.cta__button-wrap {
  padding-top: 8px;
}

/* Ensure proper spacing for the lead block */
.section__lead-block > *:last-child {
  margin-bottom: 0;
}