/* ==========================================================================
   Zion Guitar Lesson — Design tokens
   ========================================================================== */
:root {
  --color-bg: #f4f2ee;
  --color-bg-alt: #ffffff;
  --color-ink: #221f1b;
  --color-ink-soft: #4a4640;
  --color-muted: #8f897e;
  --color-line: #d8d3c8;
  --color-cta: #1c1a17;
  --color-cta-text: #f4f2ee;

  --font-en: "Poppins", "Noto Sans JP", sans-serif;
  --font-jp: "Noto Sans JP", "Poppins", sans-serif;

  --edge: clamp(20px, 6vw, 64px);
  --section-gap: clamp(72px, 14vw, 168px);

  --shell-max: 520px;

  --ease: cubic-bezier(.22, 1, .36, 1);
}

/* ==========================================================================
   Reset & base
   ========================================================================== */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-jp);
  font-weight: 300;
  line-height: 1.9;
  letter-spacing: .02em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* PC：背景画＋中央コンテンツ列 / スマホ：コンテンツのみ全幅 */
.site-canvas { display: none; }

.site-shell {
  position: relative;
  z-index: 1;
}

img { max-width: 100%; display: block; }
ul { list-style: none; margin: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
figure { margin: 0; }
iframe { border: 0; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-ink);
  color: #fff;
  padding: 10px 18px;
  z-index: 10000;
}
.skip-link:focus { left: 0; }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 950;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: clamp(16px, 3vw, 30px) var(--edge) 0;
  pointer-events: none;
}
.site-header > * { pointer-events: auto; }

.menu-trigger {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-jp);
  padding: 4px;
}
.menu-trigger__icon { display: flex; }
.menu-trigger__label {
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: lowercase;
}

.site-header__brand { text-align: right; }
.site-header__logo {
  margin: 0;
  font-family: var(--font-en);
  font-weight: 400;
  font-size: clamp(17px, 2.4vw, 22px);
  letter-spacing: .01em;
  color: var(--color-ink);
  transition: color .4s var(--ease);
}
.site-header__tagline {
  margin: 6px 0 0;
  font-size: 11px;
  line-height: 1.6;
  color: var(--color-muted);
  letter-spacing: .04em;
  transition: color .4s var(--ease);
}
.menu-trigger {
  color: var(--color-ink);
  transition: color .4s var(--ease);
}

.site-header.is-scrolled .site-header__logo,
.site-header.is-scrolled .menu-trigger,
body.nav-open .site-header .site-header__logo,
body.nav-open .site-header .menu-trigger {
  color: var(--color-ink);
}
.site-header.is-scrolled .site-header__tagline,
body.nav-open .site-header .site-header__tagline {
  color: var(--color-muted);
}

/* ==========================================================================
   Nav overlay
   ========================================================================== */
.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 900;
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 40px var(--edge);
  transform: translateY(-100%);
  opacity: 0;
  transition: transform .5s var(--ease), opacity .5s var(--ease);
}
.nav-overlay.is-open {
  transform: translateY(0);
  opacity: 1;
}
.nav-overlay__list { display: flex; flex-direction: column; gap: clamp(14px, 3vw, 22px); }
.nav-overlay__list a {
  font-family: var(--font-jp);
  font-size: clamp(22px, 5vw, 34px);
  font-weight: 400;
  color: var(--color-ink);
}
.nav-overlay__address {
  margin-top: clamp(36px, 8vw, 64px);
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.8;
}
.nav-overlay__line {
  margin-top: 18px;
  display: inline-flex;
  align-self: flex-start;
  font-size: 13px;
  padding: 12px 22px;
  border: 1px solid var(--color-ink);
  border-radius: 999px;
}

body.nav-open { overflow: hidden; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  margin: 0;
  background: var(--color-bg);
}

.hero__head {
  padding:
    clamp(88px, 14vw, 112px)
    var(--edge)
    clamp(28px, 5vw, 40px);
}

.hero__title {
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-jp);
  font-weight: 500;
  font-size: clamp(28px, 6.5vw, 44px);
  line-height: 1.55;
  letter-spacing: .03em;
}

.hero__media {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-bg);
}

.hero__video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  display: block;
}

.hero__body {
  padding: clamp(40px, 8vw, 56px) var(--edge) clamp(48px, 9vw, 72px);
}

.hero__lead {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 2.15;
  color: var(--color-ink-soft);
  margin: 0;
}
.hero__lead + .hero__lead { margin-top: 1.2em; }

.hero__body .dot-link { margin-top: clamp(28px, 6vw, 44px); }

.dot-link {
  margin-top: clamp(28px, 6vw, 44px);
  display: inline-flex;
  align-items: center;
  gap: 16px;
}
.dot-link__circle {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--color-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background .3s var(--ease);
}
.dot-link__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-ink);
  transition: background .3s var(--ease);
}
.dot-link__text { font-size: 13px; letter-spacing: .05em; color: var(--color-ink); }
.dot-link:hover .dot-link__circle { background: var(--color-ink); }
.dot-link:hover .dot-link__dot { background: var(--color-bg); }

/* ==========================================================================
   Full-bleed photo breathers
   ========================================================================== */
.bleed-photo { margin: 0; overflow: hidden; }
.bleed-photo img { width: 100%; height: clamp(280px, 60vw, 620px); object-fit: cover; }
.bleed-photo--short img { height: clamp(220px, 42vw, 460px); }

/* ==========================================================================
   Section heading (generic)
   ========================================================================== */
.section-heading { padding: var(--section-gap) 0 clamp(36px, 7vw, 56px); background: var(--color-bg-alt); }
.section-heading__inner { max-width: 760px; margin: 0 auto; padding: 0 var(--edge); }
.section-heading__title {
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 500;
  line-height: 1.5;
  margin: 0 0 22px;
}
.section-heading__lead {
  font-size: clamp(14px, 1.5vw, 16px);
  color: var(--color-ink-soft);
  line-height: 2;
  max-width: 46em;
}

/* ==========================================================================
   Cards (lesson content)
   ========================================================================== */
.cards { background: var(--color-bg-alt); padding: 0 0 clamp(60px, 10vw, 110px); }
.cards__list {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--edge);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(36px, 6vw, 56px);
}
.cards__item.reveal { transition-delay: .05s; }
.cards__media { overflow: hidden; border-radius: 2px; }
.cards__media img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform .7s var(--ease);
}
.cards__item:hover .cards__media img { transform: scale(1.045); }
.cards__title {
  margin: 20px 0 0;
  font-size: clamp(17px, 2vw, 19px);
  font-weight: 500;
}

@media (min-width: 720px) {
  .cards__list { grid-template-columns: repeat(2, 1fr); }
}

/* ==========================================================================
   Lesson place
   ========================================================================== */
.place { background: var(--color-bg); }
.place__photo { margin: 0; overflow: hidden; }
.place__photo img { width: 100%; height: clamp(260px, 55vw, 560px); object-fit: cover; }
.place__body { max-width: 760px; margin: 0 auto; padding: clamp(40px, 8vw, 70px) var(--edge) var(--section-gap); }
.place__label {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--color-muted);
  margin: 0 0 16px;
}
.place__title {
  font-size: clamp(24px, 4.4vw, 36px);
  font-weight: 500;
  line-height: 1.55;
  margin: 0 0 26px;
}
.place__text {
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 2.15;
  color: var(--color-ink-soft);
}

/* ==========================================================================
   Audience
   ========================================================================== */
.audience { background: var(--color-bg-alt); padding: var(--section-gap) 0; }
.audience__inner { max-width: 760px; margin: 0 auto; padding: 0 var(--edge); }
.audience__label { font-size: 12px; letter-spacing: .12em; color: var(--color-muted); margin: 0 0 16px; }
.audience__title { font-size: clamp(26px, 4.6vw, 38px); font-weight: 500; line-height: 1.5; margin: 0 0 34px; }
.audience__body { display: flex; flex-direction: column; gap: 1.2em; }
.audience__text {
  margin: 0;
  padding-top: 18px;
  border-top: 1px solid var(--color-line);
  font-size: clamp(14px, 1.6vw, 16px);
  color: var(--color-ink-soft);
  line-height: 1.9;
}
.audience__text:last-child {
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-line);
}
.audience__list { display: flex; flex-direction: column; gap: 0; }
.audience__list li {
  position: relative;
  padding: 18px 0 18px 30px;
  border-top: 1px solid var(--color-line);
  font-size: clamp(14px, 1.6vw, 16px);
  color: var(--color-ink-soft);
  line-height: 1.8;
}
.audience__list li:last-child { border-bottom: 1px solid var(--color-line); }
.audience__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 27px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-ink);
}
.audience__photos {
  max-width: 1180px;
  margin: clamp(40px, 7vw, 64px) auto 0;
  padding: 0 var(--edge);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(14px, 3vw, 26px);
}
.audience__photos img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  display: block;
}

/* ==========================================================================
   Plan (時間・料金・対象・持ち物)
   ========================================================================== */
.plan { background: var(--color-bg); padding: var(--section-gap) 0; }
.plan__inner { max-width: 760px; margin: 0 auto; padding: 0 var(--edge); }
.plan__list { margin: 0; }
.plan__row {
  padding: clamp(26px, 4vw, 36px) 0;
  border-top: 1px solid var(--color-line);
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 20px;
}
.plan__row:last-child { border-bottom: 1px solid var(--color-line); }
.plan__row dt {
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 500;
  letter-spacing: .04em;
}
.plan__row dd {
  margin: 0;
  font-size: clamp(14px, 1.6vw, 16px);
  color: var(--color-ink-soft);
  line-height: 1.95;
}
.plan__note { font-size: 12.5px; color: var(--color-muted); }

@media (max-width: 480px) {
  .plan__row { grid-template-columns: 1fr; gap: 8px; }
}

/* ==========================================================================
   Teacher
   ========================================================================== */
.teacher { background: var(--color-bg-alt); }
.teacher__photo { margin: 0; overflow: hidden; }
.teacher__photo img { width: 100%; height: clamp(260px, 50vw, 480px); object-fit: cover; object-position: 20% 30%; }
.teacher__body { max-width: 720px; margin: 0 auto; padding: clamp(40px, 8vw, 70px) var(--edge) var(--section-gap); }
.teacher__label { font-size: 12px; letter-spacing: .12em; color: var(--color-muted); margin: 0 0 16px; }
.teacher__name { font-size: clamp(24px, 4vw, 32px); font-weight: 500; margin: 0 0 28px; letter-spacing: .06em; }
.teacher__text {
  font-size: clamp(14px, 1.5vw, 16px);
  color: var(--color-ink-soft);
  line-height: 2.15;
  margin: 0 0 22px;
}
.teacher__text:last-child { margin-bottom: 0; }

/* ==========================================================================
   Banner divider
   ========================================================================== */
.banner { position: relative; margin: 0; overflow: hidden; }
.banner img { width: 100%; height: clamp(140px, 22vw, 260px); object-fit: cover; }
.banner figcaption {
  position: absolute;
  right: var(--edge);
  bottom: 18px;
  color: #fff;
  font-size: 12px;
  letter-spacing: .08em;
  text-shadow: 0 1px 10px rgba(0,0,0,.5);
}

/* ==========================================================================
   Access
   ========================================================================== */
.access { background: var(--color-bg); padding: var(--section-gap) 0; }
.access__photo { max-width: 340px; margin: 0 auto; overflow: hidden; }
.access__photo img { width: 100%; height: clamp(220px, 50vw, 380px); object-fit: cover; }
.access__body { max-width: 720px; margin: 0 auto; padding: clamp(36px, 7vw, 56px) var(--edge) 0; text-align: left; }
.access__label { font-size: 12px; letter-spacing: .12em; color: var(--color-muted); margin: 0 0 16px; }
.access__title { font-size: clamp(24px, 4vw, 32px); font-weight: 500; margin: 0 0 22px; }
.access__address { font-size: 15px; line-height: 1.9; margin: 0 0 18px; }
.access__text { font-size: 14px; color: var(--color-ink-soft); line-height: 2; margin: 0 0 32px; }
.access__map { border-radius: 2px; overflow: hidden; filter: grayscale(.15); }
.access__map iframe { width: 100%; height: clamp(260px, 40vw, 400px); }

/* ==========================================================================
   Contact / CTA
   ========================================================================== */
.contact {
  background: var(--color-bg-alt);
  padding: var(--section-gap) 0;
  text-align: center;
}
.contact__inner { max-width: 640px; margin: 0 auto; padding: 0 var(--edge); }
.contact__title {
  font-size: clamp(24px, 4.6vw, 38px);
  font-weight: 500;
  line-height: 1.5;
  margin: 0 0 clamp(32px, 6vw, 50px);
}
.contact__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: clamp(150px, 22vw, 190px);
  height: clamp(150px, 22vw, 190px);
  border-radius: 50%;
  background: var(--color-cta);
  color: var(--color-cta-text);
  font-size: 14px;
  line-height: 1.7;
  letter-spacing: .05em;
  transition: transform .4s var(--ease);
}
.contact__cta:hover { transform: scale(1.05); }
.contact__lead {
  margin: clamp(32px, 6vw, 50px) 0 0;
  font-size: 14px;
  color: var(--color-ink-soft);
  line-height: 2;
}
.contact__text {
  margin: 20px auto 0;
  max-width: 480px;
  font-size: 13.5px;
  color: var(--color-muted);
  line-height: 2;
}
.contact__flow {
  margin-top: clamp(48px, 8vw, 70px);
  text-align: left;
  border-top: 1px solid var(--color-line);
  padding-top: clamp(28px, 5vw, 40px);
}
.contact__flow-title { font-size: 12px; letter-spacing: .12em; color: var(--color-muted); margin: 0 0 20px; text-align: center; }
.contact__flow dl { display: flex; flex-direction: column; gap: 22px; }
.contact__flow dt { font-size: 14px; font-weight: 500; margin-bottom: 6px; }
.contact__flow dd { margin: 0; font-size: 13.5px; color: var(--color-ink-soft); line-height: 1.9; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  position: relative;
  margin: 0;
  color: #f4f2ee;
  overflow: hidden;
}
.site-footer__bg { position: absolute; inset: 0; z-index: 0; }
.site-footer__bg img { width: 100%; height: 100%; object-fit: cover; filter: brightness(.4) saturate(.9); }
.site-footer__inner {
  position: relative;
  z-index: 1;
  padding: clamp(50px, 9vw, 90px) var(--edge) clamp(30px, 5vw, 40px);
}
.site-footer__logo {
  font-family: var(--font-en);
  font-size: clamp(18px, 2.6vw, 24px);
  margin: 0 0 clamp(28px, 5vw, 44px);
}
.site-footer__inner nav ul {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: clamp(30px, 5vw, 46px);
}
.site-footer__inner nav a { font-size: 15px; }
.site-footer__line {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  border: 1px solid rgba(244,242,238,.5);
  border-radius: 999px;
  padding: 10px 18px;
  margin-bottom: clamp(30px, 5vw, 46px);
}
.site-footer__address {
  font-size: 12.5px;
  line-height: 1.9;
  color: rgba(244,242,238,.75);
  margin: 0 0 14px;
}
.site-footer__copy {
  font-size: 11px;
  color: rgba(244,242,238,.55);
  margin: 0;
}

@media (min-width: 720px) {
  .site-footer__inner nav ul { flex-direction: row; flex-wrap: wrap; gap: 28px; }
}

/* ==========================================================================
   Reveal-on-scroll
   ========================================================================== */
/* Hidden-until-scrolled state only applies once main.js confirms it can
   reveal the content again (html.js-reveal). This guarantees visitors
   without JS (or if a script fails) always see the full page. */
.js-reveal .reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ==========================================================================
   Two-column layout on larger screens
   ========================================================================== */
@media (min-width: 860px) {
  .place { display: grid; grid-template-columns: 1.1fr .9fr; align-items: center; }
  .place__photo { height: 100%; }
  .place__photo img { height: 100%; min-height: 480px; }
  .place__body { padding: clamp(40px, 5vw, 70px) clamp(40px, 5vw, 80px); text-align: left; margin: 0; max-width: none; }

  .teacher { display: grid; grid-template-columns: .85fr 1.15fr; align-items: center; }
  .teacher__photo { height: 100%; }
  .teacher__photo img { height: 100%; min-height: 460px; }
  .teacher__body { padding: clamp(40px, 5vw, 70px) clamp(40px, 5vw, 80px); margin: 0; max-width: none; }

  .access { display: grid; grid-template-columns: .55fr 1.45fr; align-items: center; gap: clamp(30px, 4vw, 60px); max-width: 1180px; margin-inline: auto; padding-inline: var(--edge); }
  .access__photo { max-width: none; }
  .access__body { padding: 0; }
}

@media (min-width: 1100px) {
  .cards__list { grid-template-columns: repeat(4, 1fr); }
}

.only-mobile { display: inline; }
@media (min-width: 640px) { .only-mobile { display: none; } }

/* PC：左に背景写真・右に単色＋中央にスマホ幅のコンテンツ列 */
@media (min-width: 769px) {
  body { background: var(--color-bg); }

  .site-canvas {
    /* 中央列の左右に残る余白（文字サイズの基準） */
    --side-gutter: calc((100vw - var(--shell-max)) / 2);
    display: block;
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
  }

  .site-canvas__photo {
    position: absolute;
    top: 0;
    left: 0;
    width: var(--side-gutter);
    height: 100%;
    overflow: hidden;
    background: var(--color-line);
  }

  .site-canvas__photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: 28% center;
  }

  .site-canvas__solid {
    position: absolute;
    top: 0;
    right: 0;
    width: var(--side-gutter);
    height: 100%;
    background: var(--color-bg);
  }

  .site-canvas__lead {
    position: absolute;
    top: clamp(140px, 24vh, 260px);
    left: clamp(10px, calc(var(--side-gutter) * 0.1), 88px);
    max-width: min(520px, calc(var(--side-gutter) - 16px));
    margin: 0;
    /* 画面幅ではなく左右余白に合わせて縮小（狭いPCでも中央に食い込まない） */
    font-size: clamp(15px, calc(var(--side-gutter) * 0.12), 48px);
    font-weight: 500;
    line-height: 1.65;
    letter-spacing: 0.05em;
    color: #fff;
    text-shadow: 0 2px 16px rgba(0, 0, 0, 0.32);
    z-index: 1;
  }

  .site-canvas__logo {
    position: absolute;
    right: clamp(10px, calc(var(--side-gutter) * 0.1), 88px);
    bottom: clamp(28px, 5vh, 64px);
    max-width: calc(var(--side-gutter) - 16px);
    margin: 0;
    font-family: var(--font-en);
    /* 「ZION GUITAR」が左右余白に収まるよう余白幅基準で縮小 */
    font-size: clamp(12px, calc((var(--side-gutter) - 24px) / 8), 112px);
    font-weight: 300;
    line-height: 1.05;
    letter-spacing: 0.05em;
    color: var(--color-ink-soft);
    text-align: right;
    white-space: nowrap;
    z-index: 1;
    perspective: 800px;
  }

  .site-canvas__logo-char {
    display: inline-block;
    white-space: pre;
  }

  @keyframes site-canvas-slingshot {
    0% { transform: translateZ(-500px) scale(0.1); opacity: 0; }
    60% { transform: translateZ(100px) scale(1.2); opacity: 1; }
    100% { transform: translateZ(0) scale(1); opacity: 1; }
  }

  .site-shell {
    max-width: var(--shell-max);
    margin: 0 auto;
    background: var(--color-bg);
    min-height: 100vh;
    box-shadow:
      -12px 0 48px rgba(0, 0, 0, 0.1),
      12px 0 48px rgba(0, 0, 0, 0.1),
      0 0 80px rgba(0, 0, 0, 0.08);
  }

  .site-header {
    left: 50%;
    right: auto;
    transform: translateX(-50%);
    width: 100%;
    max-width: var(--shell-max);
  }

  .nav-overlay {
    left: 50%;
    right: auto;
    width: 100%;
    max-width: var(--shell-max);
    transform: translate(-50%, -100%);
  }
  .nav-overlay.is-open {
    transform: translate(-50%, 0);
  }

  /* 中央列はスマホと同じ見え方を維持 */
  .site-shell .only-mobile { display: inline; }

  .place,
  .teacher,
  .access {
    display: block;
    max-width: none;
    padding-inline: 0;
  }
  .place__photo,
  .teacher__photo { height: auto; }
  .place__photo img,
  .teacher__photo img {
    height: clamp(260px, 55vw, 560px);
    min-height: 0;
  }
  .teacher__photo img { object-position: center 30%; }
  .access__photo { max-width: none; margin-inline: auto; }
  .access__body { padding: clamp(36px, 7vw, 56px) var(--edge) 0; }
  .cards__list { grid-template-columns: 1fr; }
  .site-footer__inner nav ul { flex-direction: column; gap: 14px; }
  .plan__row { grid-template-columns: 1fr; gap: 8px; }
}