/* =====================================================
   NEXT PE training studio — stylesheet
   ===================================================== */

/* ---------- Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, p, figure, dl, dd { margin: 0; }
img { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; border: 0; background: transparent; color: inherit; }
a { color: inherit; text-decoration: none; }
input, textarea, select { font: inherit; color: inherit; }

/* ---------- Design tokens ---------- */
:root {
  --color-bg:        #0f0f10;   /* near-black */
  --color-bg-alt:    #17171a;
  --color-surface:   #1d1d20;
  --color-text:      #eceae4;   /* warm off-white */
  --color-text-mute: #9b9891;
  --color-line:      #2a2a2e;
  --color-accent:    #c9b890;   /* warm sand */
  --font-serif-en:   "Cormorant Garamond", "Times New Roman", serif;
  --font-serif-jp:   "Noto Serif JP", "Hiragino Mincho ProN", "YuMincho", "Yu Mincho", serif;
  --max-w:           1200px;
  --pad-x:           clamp(1.25rem, 4vw, 3rem);
}

/* ---------- Base ---------- */
body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-serif-jp);
  font-weight: 300;
  line-height: 1.9;
  letter-spacing: .04em;
  font-feature-settings: "palt";
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--color-accent); color: var(--color-bg); }

em { font-style: normal; color: var(--color-accent); }
strong { font-weight: 500; color: var(--color-text); }

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  padding: 1.1rem var(--pad-x);
  background: linear-gradient(180deg, rgba(15,15,16,.85) 0%, rgba(15,15,16,0) 100%);
  transition: background .35s ease, padding .35s ease;
}
.site-header.is-scrolled {
  background: rgba(15,15,16,.92);
  backdrop-filter: blur(8px);
  padding: .7rem var(--pad-x);
  border-bottom: 1px solid var(--color-line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-w);
  margin: 0 auto;
}
.header-logo img { width: 42px; height: auto; filter: drop-shadow(0 1px 2px rgba(0,0,0,.4)); }
.header-nav {
  display: flex;
  gap: 2rem;
  font-family: var(--font-serif-en);
  font-size: .95rem;
  letter-spacing: .12em;
}
.header-nav a {
  color: var(--color-text-mute);
  position: relative;
  padding: .2rem 0;
  transition: color .2s;
}
.header-nav a:hover { color: var(--color-text); }
.header-nav a::after {
  content: "";
  position: absolute; left: 0; bottom: -2px;
  width: 100%; height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .35s ease;
}
.header-nav a:hover::after { transform: scaleX(1); transform-origin: left; }

.nav-toggle { display: none; width: 32px; height: 32px; position: relative; }
.nav-toggle span {
  position: absolute; left: 4px; right: 4px; height: 1px;
  background: var(--color-text);
  transition: transform .3s, opacity .3s, top .3s;
}
.nav-toggle span:nth-child(1) { top: 10px; }
.nav-toggle span:nth-child(2) { top: 16px; }
.nav-toggle span:nth-child(3) { top: 22px; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { top: 16px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { top: 16px; transform: rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 8rem var(--pad-x) 6rem;
  overflow: hidden;
  background: var(--color-bg);
}
.hero-media {
  position: absolute; inset: 0;
  background-image:
    /* 左下〜下側を濃く落として白文字の可読性を確保 */
    linear-gradient(180deg, rgba(10,10,11,.55) 0%, rgba(10,10,11,.35) 35%, rgba(10,10,11,.85) 100%),
    linear-gradient(90deg, rgba(10,10,11,.55) 0%, rgba(10,10,11,.15) 55%, rgba(10,10,11,.05) 100%),
    url("../images/studio-hero.jpg");
  background-size: cover, cover, cover;
  background-position: center, center, center;
  background-repeat: no-repeat;
  z-index: 0;
}
.hero-media::before {
  /* subtle grain */
  content: "";
  position: absolute; inset: 0;
  background-image:
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 .08 0'/></filter><rect width='200' height='200' filter='url(%23n)'/></svg>");
  mix-blend-mode: overlay;
  opacity: .35;
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
}
.hero-eyebrow {
  font-family: var(--font-serif-en);
  letter-spacing: .35em;
  font-size: .85rem;
  color: var(--color-accent);
  margin-bottom: 2rem;
  text-transform: uppercase;
}
.hero-title {
  font-family: var(--font-serif-jp);
  font-weight: 300;
  font-size: clamp(2.2rem, 6.5vw, 5rem);
  line-height: 1.4;
  letter-spacing: .1em;
}
.hero-title span { display: block; }
.hero-sub {
  margin-top: 2rem;
  color: var(--color-text-mute);
  font-family: var(--font-serif-en);
  letter-spacing: .18em;
  font-size: clamp(.85rem, 1.4vw, 1rem);
  line-height: 1.9;
}
.hero-scroll {
  position: absolute;
  bottom: 2rem; left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-serif-en);
  letter-spacing: .3em;
  font-size: .7rem;
  color: var(--color-text-mute);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  z-index: 1;
}
.hero-scroll span {
  width: 1px; height: 50px;
  background: linear-gradient(180deg, transparent, var(--color-text-mute));
  animation: scrollLine 2.6s ease-in-out infinite;
}
@keyframes scrollLine {
  0%   { transform: scaleY(0); transform-origin: top; }
  50%  { transform: scaleY(1); transform-origin: top; }
  51%  { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---------- Sections ---------- */
.section {
  padding: clamp(5rem, 12vh, 10rem) var(--pad-x);
  max-width: var(--max-w);
  margin: 0 auto;
}
.section-head { margin-bottom: 4rem; }
.section-head--center { text-align: center; }
.eyebrow {
  font-family: var(--font-serif-en);
  letter-spacing: .35em;
  text-transform: uppercase;
  font-size: .78rem;
  color: var(--color-accent);
  margin-bottom: 1.2rem;
}
.section-title {
  font-family: var(--font-serif-jp);
  font-weight: 300;
  font-size: clamp(1.7rem, 3.8vw, 2.8rem);
  line-height: 1.6;
  letter-spacing: .1em;
}
.section-title--left  { text-align: left; }
.section-title--center{ text-align: center; }
.section-title .ruby {
  display: block;
  margin-top: .8rem;
  font-family: var(--font-serif-en);
  font-size: .5em;
  letter-spacing: .25em;
  color: var(--color-text-mute);
}

/* ---------- Concept ---------- */
.section-concept .concept-body {
  max-width: 640px;
  margin: 0 auto;
}
.section-concept .concept-body p {
  margin-bottom: 1.6rem;
  font-size: clamp(1rem, 1.35vw, 1.08rem);
}
.concept-quote {
  max-width: 680px;
  margin: 5rem auto 0;
  padding: 3rem 2rem;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  text-align: center;
  font-family: var(--font-serif-jp);
  font-size: clamp(1.05rem, 1.5vw, 1.2rem);
  line-height: 2.2;
  letter-spacing: .12em;
}

/* ---------- Studio ---------- */
.section-studio { background: var(--color-bg-alt); max-width: none; }
.section-studio .section-head,
.section-studio .studio-gallery { max-width: var(--max-w); margin-left: auto; margin-right: auto; }

.studio-gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem 2.5rem;
}
.studio-figure { margin: 0; }
.studio-figure--wide { grid-column: 1 / -1; }
.figure-media {
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(135deg, #1f1f22 0%, #111113 100%);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
  border: 1px solid var(--color-line);
  overflow: hidden;
}
.studio-figure--wide .figure-media { aspect-ratio: 21 / 9; }
/* プレースホルダー文字は画像が設定されていない（data-placeholderがあり、かつ画像未指定）ときだけ表示 */
.figure-media:not([style*="background-image"])[data-placeholder]::after {
  content: attr(data-placeholder);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif-en);
  letter-spacing: .4em;
  font-size: .75rem;
  color: var(--color-text-mute);
  opacity: .45;
}
.studio-figure figcaption { padding: 1.2rem 0 0; }
.fig-label {
  font-family: var(--font-serif-en);
  letter-spacing: .3em;
  font-size: .78rem;
  color: var(--color-accent);
  margin-bottom: .6rem;
}
.fig-text {
  font-size: .96rem;
  color: var(--color-text-mute);
  line-height: 2;
}

/* ---------- Trainer ---------- */
.trainer-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 4rem;
  align-items: center;
}
.trainer-portrait .figure-media--portrait {
  aspect-ratio: 3 / 4;
}
.trainer-lead {
  margin: 1.8rem 0 2.6rem;
  color: var(--color-text-mute);
  font-size: 1rem;
  line-height: 2.1;
}
.trainer-lead p {
  margin: 0 0 1.3rem;
}
.trainer-lead p:last-child { margin-bottom: 0; }
.trainer-lead em {
  font-style: normal;
  color: var(--color-accent);
}
.trainer-credentials {
  display: grid;
  gap: 2rem;
}
.trainer-credentials > div {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 1.5rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--color-line);
}
.trainer-credentials dt {
  font-family: var(--font-serif-en);
  letter-spacing: .25em;
  font-size: .8rem;
  color: var(--color-accent);
  padding-top: .2rem;
}
.trainer-credentials dd {
  margin: 0;
  font-size: .95rem;
  line-height: 2;
  color: var(--color-text-mute);
}

/* ---------- Introduction ---------- */
.section-intro { background: var(--color-bg-alt); max-width: none; }
.intro-inner {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}
.intro-body {
  margin-top: 3rem;
  text-align: left;
}
.intro-body p {
  margin-bottom: 1.5rem;
  font-size: 1rem;
  line-height: 2.1;
  color: var(--color-text);
}
.intro-body .intro-note {
  margin-top: 3rem;
  padding: 1.5rem 1.8rem;
  border: 1px solid var(--color-line);
  font-size: .95rem;
  text-align: center;
  color: var(--color-text-mute);
}

/* ---------- Access ---------- */
.access-list {
  max-width: 680px;
  margin: 0 auto;
}
.access-list > div {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 1.5rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--color-line);
}
.access-list > div:first-child { border-top: 1px solid var(--color-line); }
.access-list dt {
  font-family: var(--font-serif-en);
  letter-spacing: .25em;
  font-size: .82rem;
  color: var(--color-accent);
}
.access-list dd {
  margin: 0;
  font-size: .95rem;
  line-height: 1.9;
  color: var(--color-text-mute);
}
.access-map {
  max-width: var(--max-w);
  margin: 4rem auto 0;
  border: 1px solid var(--color-line);
  overflow: hidden;
  background: #000;
}
.access-map iframe {
  display: block;
  width: 100%;
  height: 420px;
  border: 0;
  filter: grayscale(.3) contrast(.95) brightness(.9);
}
@media (max-width: 560px) {
  .access-map iframe { height: 320px; }
}

/* ---------- Contact ---------- */
.contact-inner {
  max-width: 620px;
  margin: 0 auto;
}
.contact-lead {
  text-align: center;
  margin: 2rem 0 3.5rem;
  color: var(--color-text-mute);
  line-height: 2;
}
.contact-lead small { font-size: .85rem; display: inline-block; margin-top: .8rem; }
.contact-form { display: grid; gap: 1.8rem; }
.form-row { display: grid; gap: .6rem; }
.form-row label {
  font-family: var(--font-serif-en);
  letter-spacing: .2em;
  font-size: .82rem;
  color: var(--color-accent);
}
.form-row label span {
  margin-left: .6rem;
  font-size: .7rem;
  color: var(--color-text-mute);
  letter-spacing: .15em;
}
.form-row input,
.form-row textarea {
  width: 100%;
  padding: .9rem 1rem;
  background: transparent;
  border: 1px solid var(--color-line);
  color: var(--color-text);
  font-family: var(--font-serif-jp);
  font-size: 1rem;
  letter-spacing: .04em;
  transition: border-color .2s;
}
.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}
.form-row--submit { justify-items: center; margin-top: 1rem; }
.btn {
  display: inline-block;
  padding: 1rem 3.2rem;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  font-family: var(--font-serif-en);
  letter-spacing: .3em;
  font-size: .9rem;
  text-transform: uppercase;
  background: transparent;
  transition: background .25s, color .25s;
}
.btn:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* ---------- Footer ---------- */
.site-footer {
  padding: 4rem var(--pad-x) 2.5rem;
  border-top: 1px solid var(--color-line);
  background: var(--color-bg);
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  text-align: center;
}
.footer-logo { width: 96px; margin: 0 auto 1.5rem; }
.footer-copy {
  font-family: var(--font-serif-en);
  letter-spacing: .25em;
  font-size: .72rem;
  color: var(--color-text-mute);
}

/* ---------- Responsive ---------- */
@media (max-width: 880px) {
  .header-nav {
    position: fixed;
    inset: 0;
    flex-direction: column;
    justify-content: center;
    gap: 2.5rem;
    background: rgba(15,15,16,.98);
    backdrop-filter: blur(12px);
    font-size: 1.1rem;
    transform: translateX(100%);
    transition: transform .4s ease;
  }
  .header-nav.is-open { transform: translateX(0); }
  .nav-toggle { display: block; z-index: 60; }

  .studio-gallery { grid-template-columns: 1fr; gap: 2.5rem; }
  .studio-figure--wide { grid-column: auto; }

  .trainer-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .trainer-credentials > div { grid-template-columns: 1fr; gap: .5rem; }
  .access-list > div { grid-template-columns: 1fr; gap: .4rem; }
}

@media (max-width: 560px) {
  .hero-title { letter-spacing: .08em; }
  .hero-eyebrow { letter-spacing: .25em; }
  .section { padding-left: 1.25rem; padding-right: 1.25rem; }
}

/* ---------- Reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 1s ease, transform 1s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}