/* ================================================================
   GRAND DESIGN v2 - Design System CSS
   Base: 1600px PC layout / Responsive with clamp()
   Fonts: Grand Bodoni (ロゴ・見出し) / Zen Old Mincho (見出し) / Noto Sans JP (本文)
   ================================================================ */

/* ===== Custom Font ===== */
@font-face {
  font-family: 'Grand Bodoni';
  src: url('../../font/Grand_Bodoni.otf') format('opentype');
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

/* ===== Tokens ===== */
:root {
  --color-primary: #FFE500;
  --color-black: #000000;
  --color-white: #FFFFFF;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-border: #cccccc;
  --font-logo: 'Grand Bodoni', 'Georgia', serif;
  --font-serif: 'Zen Old Mincho', 'Georgia', serif;
  --font-sans: 'Noto Sans JP', 'Helvetica Neue', 'Arial', sans-serif;
  --section-px: clamp(20px, 5vw, 80px);
  --grid-margin: clamp(20px, 5.1vw, 82px);
  --header-height: 44px;
}

/* ===== Reset ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { background: var(--color-black); }
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
.lenis.lenis-smooth [data-lenis-prevent] { overscroll-behavior: contain; }
.lenis.lenis-stopped { overflow: hidden; }
body { font-family: var(--font-sans); color: var(--color-black); line-height: 1.8; -webkit-font-smoothing: antialiased; background: var(--color-white); }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; }

/* ================================================================
   B-01: Header
   ================================================================ */
.site-header {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--header-height);
  z-index: 1000; background: var(--color-black);
}
.header-inner {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0 var(--section-px);
  height: 100%;
  max-width: 1600px; margin: 0 auto;
}
.header-logo {
  font-family: var(--font-logo); font-size: 28px; font-weight: normal;
  font-kerning: normal; letter-spacing: 0.04em;
  color: var(--color-white); white-space: nowrap;
  display: inline-block; transform: translateY(4px);
}
.header-inner nav {
  height: 100%;
}
.header-nav-list {
  display: flex; align-items: center; gap: clamp(20px, 3vw, 44px);
  margin-left: clamp(20px, 3vw, 44px);
  height: 100%;
}
.header-nav-list a {
  font-family: var(--font-logo); font-size: 28px; font-weight: normal;
  font-kerning: normal; letter-spacing: 0.04em;
  color: var(--color-white); transition: opacity 0.3s;
  display: inline-block; transform: translateY(4px);
}
.header-nav-list a:hover { opacity: 0.5; }
.header-ai-icon {
  display: inline-block; height: 34px; width: auto;
  vertical-align: middle; transition: opacity 0.3s;
}
.header-ai-icon:hover { opacity: 0.7; }
.header-nav-list a.header-ai-btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0; background: none; transform: translateY(4px);
  transition: opacity 0.3s;
}
.header-ai-btn:hover { opacity: 0.7; }
.header-ai-btn-img {
  height: 32px; width: auto; display: block;
  max-width: none; min-height: 32px;
}

/* Header Dropdown Menu */
.header-nav-dropdown {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
  align-self: stretch;
}
.header-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(calc(-30% - 6px));
  background: var(--color-primary);
  padding: 12px 18px 2px 18px;
  min-width: 170px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
  z-index: 1001;
}
.header-nav-dropdown:hover .header-dropdown-menu {
  opacity: 1;
  visibility: visible;
}
.header-dropdown-menu li {
  margin-bottom: 0;
  line-height: 1.5;
}
.header-dropdown-menu a {
  font-family: var(--font-logo);
  font-size: 28px;
  font-weight: normal;
  letter-spacing: 0.04em;
  color: var(--color-black) !important;
  display: block;
  transition: opacity 0.3s;
  transform: none;
}
.header-dropdown-menu a:hover {
  opacity: 0.6;
}

.hamburger { display: none; }

/* Mobile Nav */
.mobile-nav {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: var(--color-primary); z-index: 999;
  display: flex; flex-direction: column; justify-content: center; align-items: flex-start;
  padding: 0 var(--section-px);
  gap: 4px;
  opacity: 0; visibility: hidden; transition: opacity 0.3s, visibility 0.3s;
}
.mobile-nav.is-open { opacity: 1; visibility: visible; }
.mobile-nav a {
  font-family: var(--font-logo); font-size: clamp(58px, 15vw, 80px); font-weight: 400;
  letter-spacing: 0.02em; line-height: 1.2;
  color: var(--color-black); transition: opacity 0.3s;
}
.mobile-nav a:hover { opacity: 0.5; }
.mobile-nav a.mobile-nav-ai-btn {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--color-black);
  color: var(--color-primary) !important;
  font-family: var(--font-logo); font-size: clamp(36px, 9vw, 48px); font-weight: 400;
  letter-spacing: 0.05em; line-height: 1;
  width: 100%;
  height: 56px;
  padding: 8px 0 0 0;
  border-radius: 9999px;
  margin-top: 36px;
  transition: opacity 0.3s;
}
.mobile-nav a.mobile-nav-ai-btn:hover { opacity: 0.7; }

/* ================================================================
   B-02: Hero Section (TOP)
   ================================================================ */
.hero-section {
  position: relative; width: 100%;
  height: clamp(260px, 50.5vw, 808px);
  overflow: hidden; background: var(--color-black);
  margin-top: 42px;
}
.hero-section img, .hero-section video {
  width: 100%; height: 100%; object-fit: cover;
}

/* TOP Hero (yellow bg + centered video + copy) */
.top-hero-section {
  background: var(--color-primary);
  padding-top: 40px;
}
.top-hero-video {
  margin: clamp(20px, 4vw, 64px) var(--section-px) 0;
  aspect-ratio: 16/9;
  max-height: 808px;
  overflow: hidden;
  background: var(--color-black);
}
.top-hero-video video {
  width: 100%; height: 100%; object-fit: cover;
}
.top-hero-copy {
  text-align: center;
  padding: clamp(120px, 18vw, 290px) var(--section-px);
}
.top-hero-heading {
  font-family: var(--font-serif);
  font-size: clamp(22px, 3vw, 48px);
  font-weight: 900; line-height: 1.6;
  color: var(--color-black); margin-bottom: 20px;
}
.top-hero-sub {
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.3vw, 36px);
  font-weight: 700; line-height: 1.8;
  color: var(--color-black);
}

/* ================================================================
   TOP v3: Fullscreen Blocks
   ================================================================ */
/* Fullscreen Video Block (Block 1) */
.top-fullscreen-video {
  position: relative;
  width: 100%;
  height: calc(100vh - var(--header-height));
  height: calc(100dvh - var(--header-height));
  overflow: hidden;
  background: var(--color-black);
}
.top-fullscreen-video video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* Hero表示演出: ロゴ先行 → 動画は再生準備完了後にフェード＋スケールで定着
     （top.js が is-logo-visible / is-video-ready を付与） */
  opacity: 0;
  transform: scale(1.05);
  transition: opacity 1.2s ease-out, transform 1.6s ease-out;
}
.top-fullscreen-video.is-video-ready video {
  opacity: 1;
  transform: scale(1);
}
.top-fullscreen-video-logo {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-logo);
  font-size: clamp(60px, 9vw, 150px);
  font-weight: normal;
  font-kerning: normal;
  letter-spacing: 0.04em;
  color: var(--color-white);
  white-space: nowrap;
  z-index: 10;
  /* Hero表示演出: フォント読込完了後にフェードイン */
  opacity: 0;
  transition: opacity 0.8s ease-out;
}
.top-fullscreen-video.is-logo-visible .top-fullscreen-video-logo {
  opacity: 1;
}

/* Fullscreen Image Block */
.top-fullscreen-image {
  position: relative;
  width: 100%;
  height: calc(100vh - var(--header-height));
  height: calc(100dvh - var(--header-height));
  overflow: hidden;
  background: var(--color-black);
}
.top-fullscreen-image img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Text Overlay Block (semi-transparent black bg) */
.top-text-overlay {
  position: relative;
  width: 100%;
  min-height: calc(100vh - var(--header-height));
  min-height: calc(100dvh - var(--header-height));
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.3);
  padding: clamp(60px, 10vw, 160px) var(--section-px);
}
.top-text-overlay-content {
  text-align: center;
  max-width: 1200px;
}
.top-text-overlay h2 {
  font-family: var(--font-serif);
  font-size: clamp(24px, 3.5vw, 56px);
  font-weight: 900;
  line-height: 1.6;
  color: var(--color-white);
  margin-bottom: 24px;
  white-space: nowrap;
}
.top-text-overlay p {
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.7vw, 43px);
  line-height: 2.0;
  color: var(--color-white);
}
/* 画像＋テキスト一体ブロック: テキストを画像上に重ねて同時にスタックインさせる（PC） */
.top-text-overlay--embedded {
  position: absolute;
  inset: 0;
  min-height: 0;
  z-index: 2;
}

/* Intro Block (white bg + black text) */
.top-intro-block {
  position: relative;
  width: 100%;
  min-height: calc(100vh - var(--header-height));
  min-height: calc(100dvh - var(--header-height));
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-white);
  padding: clamp(60px, 10vw, 160px) var(--section-px);
}
.top-intro-content {
  text-align: center;
  max-width: 900px;
}
.top-intro-ja {
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.2vw, 36px);
  font-weight: 700;
  line-height: 1.8;
  color: var(--color-black);
  margin-bottom: 24px;
}
.top-intro-en {
  font-family: var(--font-serif);
  font-size: clamp(18px, 1.8vw, 30px);
  font-weight: 400;
  line-height: 1.8;
  color: var(--color-black);
}

/* TOP Map Section (2-column, yellow bg) */
.top-map-section {
  background: var(--color-white);
  padding: clamp(32px, 4vw, 64px) var(--section-px);
}
.top-map-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: clamp(24px, 4vw, 64px);
  max-width: 1000px; margin: 0 auto;
}
.top-map-item h3 {
  font-family: var(--font-logo);
  font-size: clamp(32px, 3vw, 48px);
  font-weight: normal; margin-bottom: -19px;
  color: var(--color-black);
}
.top-map-embed {
  width: 100%; aspect-ratio: 3/2;
  background: #e0e0e0; margin-bottom: 16px; overflow: hidden;
}
.top-map-embed iframe { width: 100%; height: calc(100% + 260px); border: 0; margin-top: -130px; margin-bottom: -130px; }
.top-map-item p {
  font-family: var(--font-serif);
  font-size: clamp(13px, 1vw, 16px); line-height: 1.8; color: var(--color-black);
}

/* Client Logos */
.client-logos {
  background: var(--color-white);
  padding: clamp(48px, 5vw, 80px) var(--section-px);
  position: relative;
  z-index: 10;
}
.client-logos-inner {
  max-width: 1000px; margin: 0 auto;
}
.client-logos-inner img {
  width: 100%;
}

/* Footer variant: no nav */
.site-footer--no-nav .footer-nav { display: none; }

/* ================================================================
   B-03/05: Intro Sections (TOP)
   ================================================================ */
.intro-section {
  padding: clamp(48px, 6.25vw, 100px) var(--section-px);
}
.intro-section--yellow { background: var(--color-primary); }
.intro-section--white { background: var(--color-white); }

.intro-heading {
  font-family: var(--font-serif);
  font-size: clamp(24px, 3.7vw, 59px);
  font-weight: 900; line-height: 1.6; text-align: left;
  margin-bottom: 20px; color: var(--color-black);
}
.intro-subtext {
  font-family: var(--font-serif);
  font-size: clamp(16px, 2.1vw, 33px);
  font-weight: 400; line-height: 1.8; text-align: left;
  color: var(--color-black);
}

/* ================================================================
   B-06: Project Card (TOP, full-width image)
   ================================================================ */
.project-card {
  display: block; position: relative; overflow: hidden;
}
.project-card img {
  width: 100%; display: block; transition: transform 0.5s ease;
}
.project-card:hover img { transform: scale(1.05); }

/* TOP Block (image + label + number + heading + body) */
.top-block {
  padding: clamp(24px, 3vw, 48px) 0 0;
}
.top-block--white { background: var(--color-white); }
.top-block--yellow { background: var(--color-primary); }
.top-block-img {
  position: relative; margin: 0 var(--section-px);
  overflow: hidden;
}
.top-block-img img {
  width: 100%; height: auto; display: block; transition: transform 0.5s ease;
}
.top-block-label {
  position: absolute; bottom: 8px; left: 24px;
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.5vw, 40px);
  font-weight: 700; color: var(--color-white);
}
.top-block-fraction {
  position: absolute; bottom: 22px; right: clamp(32px, 4vw, 60px);
  width: clamp(65px, 7vw, 115px);
}
.frac-num, .frac-den {
  font-family: var(--font-serif);
  font-size: clamp(40px, 4.8vw, 78px);
  font-weight: 400; color: var(--color-white);
  line-height: 1; position: relative; z-index: 1;
  display: block;
}
.frac-num { text-align: left; }
.frac-den { text-align: right; margin-top: -0.1em; }
.frac-slash {
  display: block;
  width: 160%; height: 0;
  border-top: 2.5px solid white;
  transform: rotate(-40deg);
  transform-origin: center;
  margin: 0.05em 0;
  margin-left: -30%;
}
.top-block-text {
  padding: clamp(16px, 1.5vw, 24px) var(--section-px) clamp(48px, 5vw, 80px);
}
.top-block-heading {
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.8vw, 45px);
  font-weight: 900; line-height: 1.5;
  color: var(--color-black); margin-bottom: 16px;
}
.top-block-body {
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.5vw, 24px); line-height: 2.0;
  color: var(--color-black);
}

/* ================================================================
   B-06: Clients Intro + Parallax Section (Sticky Text + Scrolling Images)
   ================================================================ */
.clients-parallax-section {
  position: relative;
  background: var(--color-white);
  /* セクション全体の高さ = stickyテキスト領域 + 画像の高さ */
  min-height: calc(100vh + clamp(1800px, 220vw, 4000px));
  /* stack-containerより上に表示（前のブロックが見えないように） */
  z-index: 50;
}

/* テキスト：position: stickyで画面上部に固定、画像の下に重なる */
.clients-intro-sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--section-px);
  /* 背景を透明にして画像が見えるようにする */
  background: transparent;
  /* 画像より下に表示（文字が写真の下になる） */
  z-index: 1;
  /* クリックイベントを上の画像に通す */
  pointer-events: none;
}

.clients-intro-text {
  font-family: var(--font-serif);
  font-size: clamp(22px, 3vw, 48px);
  font-weight: 700;
  line-height: 2;
  color: var(--color-black);
  text-align: center;
  position: relative;
  z-index: 10;
  pointer-events: auto;
}

/* 画像コンテナ：テキストの前（上）をスクロール */
.clients-parallax-section .parallax-clients-images {
  position: relative;
  width: 100%;
  min-height: clamp(1800px, 220vw, 4000px);
  /* テキストより上のレイヤー（写真が文字の上に重なる） */
  z-index: 100;
  /* テキストが先に表示されるよう、画像の開始位置を下げる */
  /* padding-topで白い領域を作り、スクロールしてから画像が現れる */
  padding-top: 50vh;
  /* パララックス画像がコンテナ外にはみ出さないようにクリップ */
  overflow: hidden;
}

.parallax-item {
  position: absolute;
  left: var(--x);
  top: var(--y);
  --base-width: clamp(340px, 45vw, 720px);
  width: calc(var(--base-width) * var(--scale, 1));
  transform: translateY(0);
  transition: transform 0.15s ease-out;
  will-change: transform;
}
.parallax-item img {
  width: 100%;
  height: auto;
  display: block;
}

/* Responsive adjustments for clients-parallax section */
@media (max-width: 1024px) {
  .clients-parallax-section {
    min-height: calc(100vh + clamp(1600px, 250vw, 3200px));
  }
  .clients-parallax-section .parallax-clients-images {
    min-height: clamp(1600px, 250vw, 3200px);
  }
  .parallax-item {
    width: clamp(260px, 50vw, 480px);
  }
}
@media (max-width: 768px) {
  .clients-parallax-section {
    min-height: calc(100vh + clamp(1400px, 320vw, 2400px));
  }
  .clients-parallax-section .parallax-clients-images {
    min-height: clamp(1400px, 320vw, 2400px);
  }
  .parallax-item {
    width: clamp(200px, 55vw, 350px);
  }
}

/* ================================================================
   B-07: CTA Block Dark
   ================================================================ */
.cta-dark {
  background: var(--color-black);
  padding: clamp(37px, 5vw, 80px) var(--section-px);
  text-align: center;
  position: relative;
  z-index: 100;
}
.cta-dark a {
  font-family: var(--font-serif);
  font-size: clamp(20px, 3vw, 48px);
  font-weight: 700; color: var(--color-white);
  letter-spacing: 0.05em; transition: opacity 0.3s;
}
.cta-dark a:hover { opacity: 0.6; }

/* ================================================================
   B-08: About Section (Yellow)
   ================================================================ */
.about-section {
  background: var(--color-white);
  padding: clamp(48px, 5vw, 80px) var(--section-px);
  color: var(--color-black);
}
.about-inner { max-width: 1000px; margin: 0 auto; }
.about-inner img { width: 100%; height: auto; margin-bottom: 20px; }
.about-inner p { font-family: var(--font-serif); font-size: clamp(14px, 1.2vw, 18px); line-height: 2.0; color: var(--color-black); }

/* ================================================================
   B-09: Founders Section
   ================================================================ */
.founders-section {
  background: var(--color-white);
  padding: 10px var(--section-px) 35px;
}
.founders-grid {
  display: grid;
  grid-template-columns: repeat(2, 450px);
  gap: 0;
  max-width: 1000px;
  margin: 0 auto;
  justify-content: space-between;
}
.founder-card {
  display: flex;
  flex-direction: column;
  width: 450px;
}
.founder-photo {
  margin-bottom: 14px;
}
.founder-photo img {
  width: 450px;
  height: auto;
  object-fit: cover;
}
.founder-info {
  text-align: left;
}
.founder-name {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 400;
  color: var(--color-black);
  margin-bottom: 1px;
  line-height: 1.5;
}
.founder-name span {
  font-weight: 400;
  margin-left: 0.5em;
}
.founder-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 400;
  color: var(--color-black);
  margin-bottom: 18px;
  line-height: 1.5;
}
.founder-bio {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 400;
  color: var(--color-black);
  line-height: 2.0;
}
@media (max-width: 960px) {
  .founders-section {
    padding: 60px var(--section-px) 50px;
  }
  .founders-grid {
    grid-template-columns: 1fr;
    gap: 60px;
    max-width: 450px;
  }
  .founder-card {
    width: 100%;
  }
  .founder-photo img {
    width: 100%;
  }
  .founder-bio {
    font-size: 14px;
  }
}

/* ================================================================
   B-10: Awards Section
   ================================================================ */
.awards-section {
  background: var(--color-white);
  padding: clamp(40px, 5vw, 80px) var(--section-px) 52px;
}
.awards-grid {
  display: grid;
  grid-template-columns: repeat(4, 250px);
  gap: 30px 0;
  max-width: 1000px;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
}
.awards-grid img {
  width: 250px;
  height: auto;
  object-fit: contain;
}
@media (max-width: 768px) {
  .awards-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: clamp(24px, 6vw, 50px);
  }
}

/* ================================================================
   B-11: Footer
   ================================================================ */
.site-footer { background: var(--color-black); position: relative; z-index: 5; }
.footer-nav {
  padding: clamp(40px, 4vw, 64px) var(--section-px) clamp(24px, 2.5vw, 40px);
  text-align: center;
}
.footer-nav-list {
  display: flex; justify-content: center;
  gap: clamp(20px, 3vw, 48px);
}
.footer-nav-list a {
  font-family: var(--font-serif); font-size: 16px; font-weight: 500;
  color: var(--color-black); letter-spacing: 0.08em; transition: opacity 0.3s;
}
.footer-nav-list a:hover { opacity: 0.5; }
.footer-logo-area {
  text-align: center; background: var(--color-white);
  padding: clamp(18px, 2.3vw, 36px) 0 0; position: relative; z-index: 1;
  margin-bottom: -1px;
  overflow: hidden;
}
.footer-logo-text {
  font-family: var(--font-logo);
  font-size: clamp(36px, 11.5vw, 184px);
  font-weight: normal; color: var(--color-black);
  font-kerning: normal; letter-spacing: 0.04em; line-height: 1.0;
  display: inline-block; position: relative; z-index: 2;
  top: 0.14em;
  margin-bottom: -0.14em;
}

/* Footer parallax letter animation */
.footer-logo-parallax {
  display: inline-flex;
}
.footer-letter {
  display: inline-block;
  transform: translateY(calc(-150px - var(--i) * 25px));
  transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  transition-delay: calc(var(--i) * 0.025s);
}
.footer-letter.footer-space {
  width: 0.3em;
}
.footer-logo-parallax.is-visible .footer-letter {
  transform: translateY(0);
}
/* SP版ではフッターロゴアニメーションを無効化（最初から表示） */
@media (max-width: 768px) {
  .footer-letter {
    transform: none;
    transition: none;
  }
}

.footer-bottom {
  background: var(--color-black);
  height: clamp(40px, 3.1vw, 50px);
  display: flex; align-items: center; justify-content: center;
  position: relative; z-index: 3;
}
.footer-copy {
  font-family: var(--font-serif); font-size: 18px;
  color: #fff;
}
.footer-bottom-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(24px, 3vw, 48px);
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-bottom-links a {
  font-family: var(--font-serif);
  font-size: clamp(12px, 1vw, 16px);
  color: #fff;
  text-decoration: none;
  transition: opacity 0.3s ease;
}
.footer-bottom-links a:hover {
  opacity: 0.7;
}

/* Footer Yellow modifier (AI SEARCH page) */
.site-footer--yellow {
  background: var(--color-primary);
}
.site-footer--yellow .footer-logo-area {
  background: var(--color-primary);
}
/* AI SEARCH page: ai-search-section も黄色背景 */
.page-header--yellow + .ai-search-section {
  background: var(--color-primary);
}

/* ================================================================
   B-12: Page Header Yellow (vwベース全幅タイトル)
   ================================================================ */
.page-header {
  background: var(--color-white);
  padding: 60px var(--section-px) 0 var(--section-px);
  overflow: hidden; position: relative;
}
.page-header-title {
  font-family: var(--font-logo);
  font-size: clamp(48px, 18vw, 290px);
  font-weight: normal; font-kerning: normal; letter-spacing: 0.04em; line-height: 1.0;
  color: var(--color-black);
  margin: calc(-0.035em - 9px) 0 0 0; padding: 0 0 0.05em 0;
  position: relative; z-index: 2;
  max-width: 100%; word-break: break-word;
  /* フォント読込・サイズ確定後にフェード＋スライドで表示（コンテンツの .fade-in と同じ動き） */
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.page-header-title.is-sized { opacity: 1; transform: translateY(0); }

/* Page Header Yellow modifier */
.page-header--yellow {
  background: var(--color-primary);
}
.page-header--yellow .page-header-title {
  margin-top: calc(-0.035em - 10px);
}
/* Page Header with Subnav (WORK/PROTOTYPE) */
.page-header--with-subnav {
  padding-bottom: 0;
}
.page-subnav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  justify-content: space-between;
  gap: 24px;
  margin-top: -16px;
  margin-left: calc(-1 * var(--section-px));
  margin-right: calc(-1 * var(--section-px));
  padding: 0 var(--grid-margin);
}
.page-subnav-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 80px;
  font-family: var(--font-logo);
  font-size: 40px;
  font-weight: normal;
  letter-spacing: 0.04em;
  padding-top: 6px;
  color: var(--color-black);
  background: var(--color-white);
  border: 1px solid var(--color-black);
  border-radius: 9999px;
  transition: all 0.3s ease;
}
.page-subnav-btn:hover {
  background: var(--color-black);
  color: var(--color-white);
}
.page-subnav-btn.is-active {
  background: var(--color-primary);
  border-color: var(--color-black);
  color: var(--color-black);
}
.page-subnav-btn.is-active:hover {
  background: var(--color-primary);
  color: var(--color-black);
}

/* Standalone subnav (used in prototype.html - outside page-header) */
.page-subnav--standalone {
  margin-top: 30px;
  margin-left: 0;
  margin-right: 0;
  margin-bottom: clamp(40px, 5vw, 60px);
  padding: 0 var(--grid-margin);
}

/* Filter AI Button - same style as filter-tab but inverted */
.filter-ai-btn {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: clamp(12px, 1.4vw, 22px);
  font-weight: 700;
  color: var(--color-white);
  background: var(--color-black);
  padding: 4px 22px;
  border-radius: 100px;
  border: 1px solid var(--color-black);
  cursor: pointer;
  transition: opacity 0.3s;
  white-space: nowrap;
}
.filter-ai-btn:hover {
  opacity: 0.7;
}

@media (max-width: 1024px) {
  .page-subnav-btn {
    width: 280px;
    height: 50px;
    font-size: 16px;
  }
}
@media (max-width: 768px) {
  .page-header-subnav-label {
    display: none;
  }
  .page-subnav {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }
  .page-subnav-btn {
    width: 100%;
    max-width: 320px;
    height: 48px;
  }
}

/* ================================================================
   B-13: AI Search Section
   ================================================================ */
.page-header + .ai-search-section {
  padding-top: 0 !important;
}
.ai-search-section {
  background: var(--color-white);
  padding: clamp(24px, 3vw, 48px) 0 clamp(12px, 1.5vw, 24px) 0;
  text-align: center;
}
.ai-search-section iframe {
  display: block;
}
.ai-search-label {
  font-family: var(--font-serif); font-size: clamp(14px, 2.1vw, 33px); font-weight: 400;
  color: var(--color-black); margin-bottom: 24px;
}
.ai-search-area { max-width: 700px; margin: 0 auto; }
.ai-search-wrap {
  display: flex; align-items: center;
  border: 1px solid var(--color-black); background: var(--color-white);
  width: 100%; height: 96px; padding: 0 36px; gap: 16px;
  border-radius: 48px; margin-bottom: 24px;
}
.ai-search-input {
  flex: 1; border: none; outline: none;
  font-family: var(--font-serif);
  font-size: clamp(14px, 2.1vw, 33px);
  background: transparent; color: var(--color-black);
}
.ai-search-input::placeholder { color: #999; }
.ai-search-icons { display: flex; align-items: center; gap: 12px; color: #999; }
.ai-voice-btn, .ai-submit-btn {
  display: flex; align-items: center; justify-content: center;
  background: none; border: none; color: #999; padding: 4px; transition: color 0.3s;
}
.ai-voice-btn:hover, .ai-submit-btn:hover { color: var(--color-black); }
.ai-search-divider { width: 1px; height: 24px; background: #ccc; }
.ai-suggestions {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 28px 32px;
  margin-top: 48px;
}
.ai-suggestion-link {
  display: inline-block;
  font-family: var(--font-serif); font-size: clamp(14px, 1.5vw, 24px); font-weight: 400;
  color: var(--color-black); line-height: 1.4;
  background: var(--color-primary); border-radius: 100px;
  padding: 14px 32px; transition: opacity 0.3s;
}
.ai-suggestion-link:hover { opacity: 0.6; }

/* ================================================================
   B-14: Project List (2カラム)
   ================================================================ */
.project-list-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: clamp(16px, 2.5vw, 40px);
  padding: 0 var(--section-px) clamp(32px, 3vw, 48px);
  background: var(--color-white);
}
.project-list-item { display: block; overflow: hidden; }
.project-list-img {
  position: relative; overflow: hidden; aspect-ratio: 2/1;
}
.project-list-img img {
  width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s;
}
.project-list-item:hover .project-list-img img { transform: scale(1.05); }
.project-list-overlay {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  font-family: var(--font-serif);
  font-size: clamp(24px, 3.5vw, 56px);
  font-weight: 900; color: var(--color-white);
  letter-spacing: 0.02em; line-height: 1.2;
  text-align: center;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  width: 90%;
}
.project-list-body {
  padding: 16px 0 36px; background: var(--color-primary);
}
.project-list-title {
  font-family: var(--font-serif); font-size: clamp(18px, 2vw, 32px);
  font-weight: 700; margin-bottom: 0; line-height: 1.4; color: var(--color-black);
}
.project-list-subtitle {
  font-family: var(--font-serif); font-size: clamp(18px, 2vw, 32px);
  font-weight: 700; margin-bottom: 12px; line-height: 1.4; color: var(--color-black);
}
.project-list-desc {
  font-family: var(--font-serif); font-size: clamp(12px, 1.1vw, 18px);
  line-height: 1.8; color: var(--color-black);
}

/* ================================================================
   B-14b: Project Page Sections (WORK / PROTOTYPE)
   ================================================================ */
.project-section {
  background: var(--color-white);
  padding: clamp(24px, 3vw, 48px) var(--section-px) clamp(40px, 5vw, 80px);
}
.project-section:first-of-type {
  padding-top: clamp(16px, 2vw, 32px);
}
.project-section-inner {
  max-width: none;
}
.project-section-title {
  font-family: var(--font-logo);
  font-size: clamp(52px, 9vw, 145px);
  font-weight: normal;
  letter-spacing: 0.02em;
  line-height: 1.0;
  color: var(--color-black);
  margin-bottom: 0;
}
.project-section-desc {
  font-family: var(--font-serif);
  font-size: clamp(14px, 1.3vw, 18px);
  line-height: 1.9;
  color: var(--color-black);
  margin-bottom: clamp(2px, 1vw, 14px);
}
.project-view-all-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-black);
  color: var(--color-white);
  font-family: var(--font-logo);
  font-size: clamp(20px, 2.4vw, 32px);
  font-weight: 500;
  letter-spacing: 0.15em;
  width: 375px;
  height: 60px;
  padding: 0;
  padding-top: 0.1em; /* フォントのベースライン補正 */
  line-height: 1;
  border-radius: 30px;
  transition: opacity 0.3s;
}
.project-view-all-btn:hover {
  opacity: 0.7;
}

/* Mobile: shrink VIEW ALL button */
@media (max-width: 768px) {
  .project-view-all-btn {
    width: 55%;
    max-width: 220px;
    height: 48px;
    font-size: 18px;
  }
}

/* WORK Grid */
.work-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2vw, 32px);
  margin-bottom: clamp(7px, 2vw, 31px);
}
.work-item {
  display: block;
  color: var(--color-black);
  transition: opacity 0.3s;
}
.work-item:hover {
  opacity: 0.7;
}
.work-item-img {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  margin-bottom: 12px;
}
.work-item-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.work-item-text {
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.5vw, 21px);
  line-height: 1.6;
  margin-bottom: 4px;
  color: var(--color-black);
}
.work-item-name {
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.5vw, 21px);
  color: var(--color-black);
}

/* PROTOTYPE Grid */
.prototype-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2vw, 32px);
  margin-bottom: clamp(7px, 2vw, 31px);
}
.prototype-item {
  display: block;
  color: var(--color-black);
  transition: opacity 0.3s;
}
.prototype-item:hover {
  opacity: 0.7;
}
.prototype-item-img {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  margin-bottom: 12px;
  background: #f5f5f5;
}
.prototype-item-img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.prototype-item-img--empty {
  border: 1px solid #ccc;
}
.prototype-item-text {
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.5vw, 21px);
  line-height: 1.6;
  margin-bottom: 4px;
  color: var(--color-black);
}

/* Responsive: Tablet */
@media (max-width: 1023px) {
  .work-grid,
  .prototype-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Responsive: Mobile */
@media (max-width: 767px) {
  .work-grid,
  .prototype-grid {
    grid-template-columns: 1fr;
  }
  .project-section-desc br {
    display: none;
  }
}

/* ================================================================
   B-15: All Projects Link Bar
   ================================================================ */
.all-projects-bar {
  background: transparent;
  margin-top: -61px;
  padding: clamp(60px, 8vw, 120px) var(--section-px) calc(clamp(60px, 8vw, 120px) - 20px);
  text-align: center;
}
.all-projects-bar a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-black);
  color: var(--color-white);
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.5vw, 40px);
  font-weight: 700;
  letter-spacing: 0.05em;
  width: clamp(400px, 35vw, 500px);
  height: clamp(80px, 7vw, 100px);
  border-radius: 9999px;
  transition: opacity 0.3s;
}
.all-projects-bar a:hover { opacity: 0.6; }

/* Mobile: shrink button width to fit screen */
@media (max-width: 768px) {
  .all-projects-bar a {
    width: 80%;
    max-width: 320px;
    height: 64px;
    font-size: 22px;
  }
}

/* ================================================================
   B-16: Category Hero Image
   ================================================================ */
.category-hero {
  background: var(--color-white);
  padding: clamp(36px, 4.1vw, 64px) var(--section-px) 0;
}
/* First category-hero (right after page header): no top padding */
.stack-item:first-child .category-hero,
.page-header + .category-hero {
  padding-top: 0;
}
.category-hero--white { background: var(--color-white); }
.category-hero img { width: 100%; max-height: 720px; object-fit: cover; display: block; }

/* ================================================================
   B-17: Category Intro Yellow + CTA
   ================================================================ */
.cat-intro-yellow {
  background: var(--color-white);
  padding: clamp(20px, 2vw, 32px) var(--section-px);
  text-align: left;
  max-width: calc(1000px + 2 * var(--section-px));
}
.cat-intro-yellow h2 {
  font-family: var(--font-serif); font-size: clamp(24px, 2.2vw, 36px); font-weight: 700;
  line-height: 1.7; margin-bottom: 24px; color: var(--color-black);
}
.cat-intro-yellow p {
  font-family: var(--font-serif); font-size: clamp(14px, 1.2vw, 20px); line-height: 2.0; color: var(--color-black); margin-bottom: 40px;
}

/* Category Intro White (alternate) */
.cat-intro-white {
  background: var(--color-white);
  padding: clamp(20px, 2vw, 32px) var(--section-px);
  text-align: left;
}
.cat-intro-white h2 {
  font-family: var(--font-serif); font-size: clamp(24px, 2.2vw, 36px); font-weight: 700;
  line-height: 1.7; margin-bottom: 24px; color: var(--color-black);
}
.cat-intro-white p {
  font-family: var(--font-serif); font-size: clamp(14px, 1.2vw, 20px); line-height: 2.0; color: var(--color-black); margin-bottom: 40px;
}

/* ================================================================
   B-18: Category Section Black
   ================================================================ */
.cat-section-black {
  background: var(--color-black);
  padding: clamp(40px, 5vw, 80px) var(--section-px);
  text-align: left;
}
.cat-section-black h2 {
  font-family: var(--font-serif); font-size: 24px; font-weight: 700;
  line-height: 1.7; color: var(--color-white); margin-bottom: 20px;
}
.cat-section-black p {
  font-size: 14px; line-height: 2.0; color: rgba(255,255,255,0.7);
}

/* ================================================================
   B-19: Category Section White + CTA
   ================================================================ */
.cat-section-white {
  background: var(--color-white);
  padding: clamp(40px, 5vw, 80px) var(--section-px);
  text-align: left;
}
.cat-section-white h2 {
  font-family: var(--font-serif); font-size: 24px; font-weight: 700;
  line-height: 1.7; color: var(--color-black); margin-bottom: 20px;
}
.cat-section-white p {
  font-size: 14px; line-height: 2.0; color: var(--color-black); margin-bottom: 32px;
}

/* CTA Buttons */
.cta-arrow-btn {
  display: inline-flex; align-items: center; gap: 24px;
  background: var(--color-black); color: var(--color-white);
  font-family: var(--font-serif); font-size: clamp(24px, 2.4vw, 38px); font-weight: 500;
  letter-spacing: 0.05em; padding: clamp(20px, 2vw, 30px) clamp(72px, 10vw, 160px); border: none; transition: opacity 0.3s;
}
.cta-arrow-btn:hover { opacity: 0.8; }
.cta-arrow-outline {
  display: inline-flex; align-items: center; gap: 18px;
  background: transparent; color: var(--color-black);
  font-family: var(--font-serif); font-size: 24px; font-weight: 500;
  letter-spacing: 0.05em; padding: 21px 48px;
  border: 1px solid var(--color-black); transition: background 0.3s, color 0.3s;
}
.cta-arrow-outline:hover { background: var(--color-black); color: var(--color-white); }

/* ================================================================
   B-20: Detail Content
   ================================================================ */
.detail-content {
  padding: clamp(32px, 4vw, 64px) var(--section-px);
  background: var(--color-white);
}
.detail-inner {
  max-width: 1000px;
}
.detail-inner h2 {
  font-family: var(--font-serif); font-size: 32px; font-weight: 700;
  margin-bottom: 24px; color: var(--color-black); letter-spacing: 0.02em;
}
.detail-inner h3 { font-family: var(--font-serif); font-size: clamp(14px, 1.2vw, 20px); font-weight: 700; margin: 2em 0 1em; color: var(--color-black); }
.detail-inner p { font-family: var(--font-serif); font-size: clamp(14px, 1.2vw, 20px); line-height: 2.0; color: var(--color-black); margin-bottom: 20px; }
.detail-inner p.detail-list-item { margin-bottom: 0; line-height: 2.0; }
.detail-inline-img { width: 100%; display: block; margin: 2em 0 1em 0; }
.detail-gallery {
  background: var(--color-white);
  padding: 0 var(--section-px);
  margin-top: clamp(12px, 1.5vw, 24px);
  display: flex; flex-direction: column; gap: clamp(12px, 1.5vw, 24px);
}
/* 最初のギャラリー（cat-intro-yellowの後）は上部マージンを大きく */
.cat-intro-yellow + .detail-gallery { margin-top: clamp(32px, 3vw, 48px); }
.detail-gallery > img { width: 100%; display: block; }
.detail-gallery-hero { max-height: 720px; object-fit: cover; }
.detail-gallery-row { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(12px, 1.5vw, 24px); }
.detail-gallery-row--3 { grid-template-columns: 1fr 1fr 1fr; }
.detail-gallery-row img { width: 100%; height: 100%; object-fit: cover; display: block; }

.detail-brand-logos { background: var(--color-white); padding: clamp(40px, 4vw, 64px) var(--section-px); }
.detail-brand-logos-inner {
  max-width: 800px; margin: 0 auto;
  display: flex; align-items: center; justify-content: center; gap: clamp(40px, 5vw, 80px);
}
.detail-brand-logos-inner img { max-height: 60px; width: auto; }
.detail-brand-logos-inner span { display: block; }

.detail-list { list-style: disc; padding-left: 1.5em; margin-bottom: 20px; }
.detail-list li { font-family: var(--font-serif); font-size: clamp(14px, 1.2vw, 20px); line-height: 2.0; color: var(--color-black); }

.detail-images {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 32px 0;
}
.detail-images img { width: 100%; height: auto; object-fit: cover; }

/* ================================================================
   B-20b: Work Detail Page (PROTOTYPE style)
   ================================================================ */
/* Hero - 大見出し + キャッチコピー */
.detail-hero {
  background: var(--color-white);
  padding: 60px var(--section-px) clamp(40px, 4vw, 64px);
}
.detail-hero .page-header-title {
  color: var(--color-black);
  margin: calc(-0.035em - 9px) 0 0 0;
  padding-bottom: 0;
}
.detail-hero-catchcopy {
  font-family: var(--font-serif);
  font-size: clamp(24px, 3vw, 48px);
  font-weight: 400;
  line-height: 1.8;
  color: var(--color-black);
  margin: -20px 0 -5px 0;
}

/* Main Visual - フル幅画像 */
.detail-main-visual {
  width: 100%;
}
.detail-main-visual img {
  width: 100%;
  display: block;
}

/* Stats Section - 3カラム数値（333x112pxボックス） */
.detail-stats {
  display: flex;
  gap: 0;
  padding: clamp(48px, 5vw, 80px) var(--section-px) 0;
  background: var(--color-white);
}
.detail-stat-item {
  width: 333px;
  height: 112px;
  border: 1px solid var(--color-black);
  border-right: none;
  padding: 28px 24px 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.detail-stat-item:last-child {
  border-right: 1px solid var(--color-black);
}
.detail-stat-value {
  font-family: var(--font-logo);
  font-size: clamp(28px, 3vw, 40px);
  font-weight: normal;
  color: var(--color-black);
  line-height: 1;
  margin-bottom: 0;
}
.detail-stat-label {
  font-family: var(--font-serif);
  font-size: clamp(15px, 1.3vw, 18px);
  color: var(--color-black);
  line-height: 1.4;
}

/* Section - 課題・アプローチ・成果 */
.detail-section {
  padding: clamp(32px, 4vw, 64px) var(--section-px) clamp(32px, 4vw, 64px);
  background: var(--color-white);
}
/* アプローチ・成果セクション（detail-sectionの直後）の上パディングを狭く */
.detail-section + .detail-section {
  padding-top: 0;
}
.detail-section-title {
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.2vw, 36px);
  font-weight: 700;
  color: var(--color-black);
  margin-bottom: clamp(16px, 2vw, 24px);
}
.detail-section-title--large {
  font-size: clamp(32px, 4vw, 56px);
}
.detail-section-content {
  max-width: 1000px;
}
.detail-section-content p {
  font-family: var(--font-serif);
  font-size: clamp(14px, 1.2vw, 18px);
  line-height: 2.0;
  color: var(--color-black);
  margin-bottom: 1.5em;
}
.detail-section-content h4 {
  font-family: var(--font-serif);
  font-size: clamp(14px, 1.2vw, 18px);
  font-weight: 700;
  color: var(--color-black);
  margin: 2em 0 1em;
}

/* Tags Section - 関連コンセプト/継続関与 */
.detail-tags {
  padding: 16px var(--section-px);
  background: var(--color-white);
}
/* 最初のdetail-tags（成果セクションの後）の上マージン調整 */
.detail-section + .detail-tags {
  margin-top: -50px;
}
/* 連続するdetail-tagsの上マージン調整 */
.detail-tags + .detail-tags {
  margin-top: -18px;
}
.detail-tags-title {
  font-family: var(--font-serif);
  font-size: clamp(14px, 1.2vw, 18px);
  color: var(--color-black);
  margin-bottom: 12px;
}
.detail-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.detail-tag {
  display: inline-flex;
  align-items: center;
  height: 25px;
  padding: 0 16px;
  border: 1px solid var(--color-black);
  border-radius: 9999px;
  font-family: var(--font-serif);
  font-size: clamp(12px, 1vw, 14px);
  color: var(--color-black);
  text-decoration: none;
  transition: background 0.3s, color 0.3s;
}
.detail-tag:hover {
  background: var(--color-black);
  color: var(--color-white);
}

/* ================================================================
   B-21: Related Work
   ================================================================ */
.related-work {
  padding: clamp(48px, 5vw, 80px) var(--section-px) 0;
  text-align: center; background: var(--color-white);
  margin-bottom: clamp(-96px, -6vw, -48px);
}
.related-work h3 {
  font-family: var(--font-logo); font-size: clamp(40px, 5vw, 80px); font-weight: normal;
  letter-spacing: 0.1em; margin-bottom: clamp(24px, 3vw, 48px); color: var(--color-black);
}
.related-work-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: clamp(16px, 2vw, 32px);
}
.related-work-grid a { display: block; aspect-ratio: 4/3; overflow: hidden; }
.related-work-grid img { width: 100%; aspect-ratio: 16/9; object-fit: cover; transition: transform 0.5s; }
.related-work-grid a:hover img { transform: scale(1.05); }

/* ================================================================
   B-22: Access Section
   ================================================================ */
.page-header + .access-section {
  margin-top: -68px;
}
.access-section {
  background: var(--color-white);
  padding: clamp(8px, 1vw, 16px) var(--section-px);
}
.access-section + .cta-dark {
  margin-top: 172px;
}
.access-inner { max-width: 1600px; margin: 0 auto; }
.access-inner h2 {
  font-family: var(--font-logo);
  font-size: clamp(36px, 10vw, 160px);
  font-weight: normal; margin-bottom: -0.1em; color: var(--color-black);
}
.access-map {
  width: 100%; aspect-ratio: 16/9;
  background: #e0e0e0; margin-top: -63px; margin-bottom: 24px;
  overflow: hidden;
}
.access-map iframe { width: 100%; height: calc(100% + 260px); border: 0; margin-top: -130px; margin-bottom: -130px; }
.access-info {
  font-family: var(--font-serif);
  font-size: clamp(14px, 1.2vw, 20px); line-height: 2.0; color: var(--color-black);
}
.access-info .label { display: inline-block; min-width: 80px; }

/* ================================================================
   B-23: Recruit Accordion
   ================================================================ */
.page-header + .recruit-section {
  padding-top: 0;
  margin-top: -0.5em;
}
.recruit-section {
  background: var(--color-white);
  padding: clamp(32px, 3vw, 48px) var(--section-px);
}
.recruit-inner { max-width: 900px; }
.recruit-item { border-bottom: 1px solid var(--color-black); }
.recruit-item:first-child { border-top: none; }
.recruit-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 0; background: none; border: none; width: 100%; text-align: left;
  font-family: var(--font-serif); font-size: 24px; font-weight: 700;
  color: var(--color-black);
}
.recruit-icon {
  font-family: var(--font-serif); font-size: 28px; font-weight: 300;
  transition: transform 0.3s;
}
.recruit-item.is-open .recruit-icon { transform: none; }
.recruit-item.is-open .recruit-header { border-bottom: 1px solid var(--color-black); }
.recruit-body {
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease;
}
.recruit-item.is-open { border-bottom: 1px solid var(--color-black); }
.recruit-body-inner {
  padding: 24px 0 16px; background: var(--color-white);
}
.recruit-details {
  font-family: var(--font-serif);
  font-size: clamp(14px, 1.2vw, 18px); line-height: 1.8;
  padding: 12px 0; color: var(--color-black);
}
.recruit-table { width: 100%; border-collapse: collapse; }
.recruit-table tr { border: none; }
.recruit-table th {
  font-family: var(--font-serif);
  vertical-align: top; text-align: left;
  font-size: clamp(14px, 1.2vw, 18px); font-weight: 700;
  padding: 12px 24px 12px 0; white-space: nowrap; width: 150px;
}
.recruit-table td {
  font-family: var(--font-serif);
  font-size: clamp(14px, 1.2vw, 18px); line-height: 1.8; padding: 12px 0; color: var(--color-black);
}

/* ================================================================
   Privacy Policy
   ================================================================ */
.privacy-section {
  padding: clamp(24px, 4vw, 56px) var(--section-px) clamp(56px, 8vw, 104px);
}
.privacy-inner {
  max-width: 900px;
  margin: 0 auto;
  font-family: var(--font-serif);
  color: var(--color-black);
}
.privacy-intro {
  font-size: clamp(14px, 1.2vw, 18px);
  line-height: 2.0;
}
.privacy-inner h2 {
  font-size: clamp(16px, 1.4vw, 21px);
  font-weight: 700;
  margin: clamp(32px, 4vw, 48px) 0 12px;
}
.privacy-inner p,
.privacy-inner li {
  font-size: clamp(14px, 1.2vw, 18px);
  line-height: 2.0;
}
.privacy-inner ul {
  list-style: disc;
  padding-left: 1.5em;
}
.privacy-inner a {
  color: var(--color-black);
  text-decoration: underline;
}
.privacy-date {
  margin-top: clamp(40px, 5vw, 64px);
  text-align: right;
}

/* ================================================================
   B-24: Contact Hero Image (全幅)
   ================================================================ */
.contact-hero {
  background: var(--color-white); padding: 0; text-align: center;
}
.contact-hero img { width: 100%; margin: 0 auto; }

/* ================================================================
   B-25: Contact Form
   ================================================================ */
.contact-form {
  background: var(--color-white);
  padding: clamp(32px, 4vw, 64px) var(--section-px);
}
.contact-form-inner { max-width: 760px; margin: 0 auto; }
.form-row {
  display: flex; align-items: center; gap: 40px; margin-bottom: 24px;
}
.form-row.align-top { align-items: flex-start; }
.form-label {
  font-family: var(--font-serif);
  font-size: 13px; font-weight: 500;
  min-width: 140px; flex-shrink: 0;
}
.form-label.top { padding-top: 12px; }
.contact-form input[type="text"],
.contact-form input[type="email"] {
  flex: 1; height: 44px; padding: 0 4px;
  border: none; border-bottom: 1px solid var(--color-black);
  background: transparent;
  font-family: var(--font-sans); font-size: 14px; outline: none;
}
.contact-form textarea {
  flex: 1; min-height: 160px; padding: 12px 4px;
  border: none; border-bottom: 1px solid var(--color-black);
  background: transparent;
  font-family: var(--font-sans); font-size: 14px; resize: vertical; outline: none;
}
.contact-form input:focus,
.contact-form textarea:focus { border-bottom-width: 2px; }
.form-submit { text-align: center; margin-top: 40px; }
.btn-submit {
  display: inline-block; background: var(--color-black); color: var(--color-white);
  font-family: var(--font-serif); font-size: 24px; font-weight: 500;
  letter-spacing: 0.3em; padding: 24px 96px; border: none; transition: opacity 0.3s;
}
.btn-submit:hover { opacity: 0.8; }

/* ================================================================
   B-26: Category Filter Bar (09_PROJECT_ALL)
   ================================================================ */
.filter-bar {
  background: var(--color-white);
  padding: clamp(32px, 4vw, 64px) var(--grid-margin) clamp(16px, 2vw, 32px);
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: center;
}
.filter-tab {
  display: inline-block; font-family: var(--font-serif);
  font-size: clamp(12px, 1.4vw, 22px); font-weight: 700;
  color: var(--color-black); background: var(--color-white);
  padding: 4px 22px; border-radius: 100px; border: 1px solid var(--color-black);
  cursor: pointer; transition: opacity 0.3s; white-space: nowrap;
}
.filter-tab:hover { opacity: 0.7; }
.filter-tab.is-active { background: var(--color-black); color: var(--color-white); }

/* Mobile: horizontal scroll for filter tags */
@media (max-width: 768px) {
  .filter-bar {
    flex-wrap: nowrap;
    overflow-x: auto;
    justify-content: flex-start;
    -webkit-overflow-scrolling: touch;
    padding-left: var(--section-px);
    padding-right: var(--section-px);
    scrollbar-width: none; /* Firefox */
  }
  .filter-bar::-webkit-scrollbar {
    display: none; /* Chrome, Safari */
  }
  .filter-bar .filter-tab,
  .filter-bar .filter-ai-btn {
    flex-shrink: 0;
  }
}

/* ================================================================
   B-27/28: Project All Grid (09_PROJECT_ALL)
   ================================================================ */
.project-all-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2.9vw, 46px);
  padding: 21px var(--grid-margin) clamp(32px, 4vw, 64px);
  background: var(--color-white);
}
.project-all-card { display: block; overflow: hidden; background: var(--color-white); }
.project-all-card-link { display: block; text-decoration: none; color: inherit; }
.project-all-card-img { position: relative; aspect-ratio: 16/9; overflow: hidden; }
.project-all-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.project-all-card:hover .project-all-card-img img { transform: scale(1.05); }
.project-all-card-info {
  padding: clamp(4px, 0.5vw, 8px) 0;
  background: var(--color-white);
}
.project-all-card-title {
  font-family: var(--font-serif);
  font-size: clamp(14px, 1.3vw, 21px);
  font-weight: 700; color: var(--color-black); line-height: 1.4;
  margin-bottom: 2px;
}
.project-all-card-desc {
  font-family: var(--font-serif);
  font-size: clamp(14px, 1.3vw, 21px);
  color: var(--color-black); line-height: 1.8;
}

/* ================================================================
   B-29/30/31: Prototype (10_PROTOTYPE)
   ================================================================ */
.page-header + .proto-intro {
  margin-top: -1em;
}
.proto-intro {
  background: var(--color-white);
  padding: 0 var(--grid-margin) clamp(24px, 3vw, 40px);
}
.proto-intro p {
  font-family: var(--font-serif); font-size: clamp(16px, 1.5vw, 24px);
  color: var(--color-black); line-height: 2.0;
}
.proto-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2.8vw, 45px);
  padding: 0 var(--grid-margin) clamp(24px, 3vw, 48px);
  background: var(--color-white);
}
.proto-thumb {
  width: 100%; aspect-ratio: 16/9;
  background: var(--color-black); overflow: hidden;
}
.proto-thumb img, .proto-thumb video {
  width: 100%; height: 100%; object-fit: cover;
}
.proto-caption {
  padding: clamp(4px, 0.5vw, 8px) 0;
  font-family: var(--font-serif);
  font-size: clamp(14px, 1.3vw, 21px);
  color: var(--color-black); line-height: 1.8;
}

/* ================================================================
   Stacking Scroll Animation
   ================================================================ */
.stack-container {
  position: relative;
  padding-top: var(--header-height);
  /* スタッキングコンテキストを作成し、内部のfixed要素のz-indexを制限 */
  z-index: 1;
  /* fixed要素がこのコンテキストから抜け出さないようにする */
  isolation: isolate;
}

.stack-item {
  position: relative;
  /* 空スクロール用のスペース（次のブロックが入ってくるまでの余白） */
  /* 元: 80vh → 30vhに短縮 */
  padding-bottom: 30vh;
  /* 固定時にバッファ領域の背景色を子セクションから継承 */
  background: inherit;
}

/* 各ブロックの背景色をwrapperにも適用 */
.stack-item:has(> .top-hero-section),
.stack-item:has(> .top-block--yellow) {
  background: var(--color-primary);
}
.stack-item:has(> .top-block--white) {
  background: var(--color-white);
}

/* v3フルスクリーンブロック用の背景色 */
.stack-item:has(> .top-fullscreen-video),
.stack-item:has(> .top-fullscreen-image) {
  background: var(--color-black);
}
/* テキストオーバーレイは半透明なので、親の背景は透明に */
.stack-item:has(> .top-text-overlay) {
  background: transparent;
}

/* カテゴリページ用の背景色クラス */
.stack-item--yellow,
.stack-item:has(> .category-hero:not(.category-hero--white)),
.stack-item:has(> .cat-intro-yellow),
.stack-item:has(> .stack-content > .category-hero:not(.category-hero--white)),
.stack-item:has(> .stack-content > .cat-intro-yellow) {
  background: var(--color-primary);
}
.stack-item--white,
.stack-item:has(> .category-hero--white),
.stack-item:has(> .cat-intro-white),
.stack-item:has(> .stack-content > .category-hero--white),
.stack-item:has(> .stack-content > .cat-intro-white) {
  background: var(--color-white);
}

/* 最後のstack-itemの空スクロールは削除 */

/* 固定されるセクションに下部余白（次のブロックが来てもテキストが読めるように） */
/* フルスクリーンブロック（video/image/text-overlay）は除外 */
.stack-item:not(:last-child) > section:not(.top-hero-section):not(.top-fullscreen-video):not(.top-fullscreen-image):not(.top-text-overlay) {
  padding-bottom: 50px;
}

/* stack-contentラッパー（カテゴリページ用）にも下部余白 */
.stack-item:not(:last-child) > .stack-content {
  padding-bottom: 50px;
}

/* 固定されたセクション/コンテンツ（ヘッダー下に固定） */
.stack-item.is-fixed > section {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  width: 100%;
  height: calc(100vh - var(--header-height));
  height: calc(100dvh - var(--header-height));
}
/* クライアントイントロは固定時もz-indexを維持（parallax-clientsより上） */
.stack-item--clients-intro.is-fixed > section {
  z-index: 200;
}

/* stack-contentラッパーが固定される場合（カテゴリページ用） */
.stack-item.is-fixed > .stack-content {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  width: 100%;
  /* 固定時はtransformをリセットしてジャンプを防止 */
  transform: none !important;
}

/* スタックコンテナ後のセクションは上に表示 */
/* clients-parallax-sectionは除外（内部で独自のz-index管理をしている） */
.stack-container ~ section:not(.clients-parallax-section),
.stack-container ~ footer {
  position: relative;
  z-index: 100;
}

/* ================================================================
   Responsive - Tablet (max-width: 1023px)
   ================================================================ */
@media (max-width: 1023px) {
  /* タブレット以下ではスタッキングスクロールが動作しないため、空スクロール用paddingを削除 */
  .stack-container {
    padding-top: var(--header-height);
  }

  .stack-item {
    padding-bottom: 0 !important;
    background: transparent !important;
  }

  /* v3ブロック：正方形レイアウト（スタッキング演出なし） */
  #top-blocks {
    display: flex;
    flex-direction: column;
    gap: 0;
  }

  #top-blocks .stack-item {
    margin: 0;
    padding: 0 !important;
  }

  .top-fullscreen-video,
  .top-fullscreen-image,
  .top-text-overlay {
    height: auto !important;
    min-height: auto !important;
    aspect-ratio: 1 / 1;
    display: block;
    margin: 0;
    padding: 0;
  }

  /* テキストオーバーレイは黒背景に（下の画像が見えないように） */
  .top-text-overlay {
    background: var(--color-black);
    display: flex;
    padding: clamp(24px, 5vw, 48px) var(--section-px) !important;
  }

  /* 画像＋テキスト一体ブロックは従来どおり縦積みに戻す（画像→黒テキストブロック） */
  .top-fullscreen-image--with-text {
    height: auto;
  }
  .top-fullscreen-image--with-text img {
    position: static;
    display: block;
    width: 100%;
    height: auto;
  }
  .top-text-overlay--embedded {
    position: static;
    inset: auto;
  }

  /* is-fixedクラスが付いても固定しない */
  .stack-item.is-fixed > section {
    position: relative;
    top: auto;
    left: auto;
    right: auto;
    height: auto;
  }

  .page-header { padding-top: 56px; }
  .page-header-title { margin-top: calc(-0.04em - 9px); }

  .project-list-grid { grid-template-columns: 1fr; }
  .project-all-grid { grid-template-columns: repeat(2, 1fr); }
  .proto-grid { grid-template-columns: repeat(2, 1fr); }
  .detail-images { grid-template-columns: 1fr 1fr; }
  .top-map-grid { grid-template-columns: 1fr 1fr; }

  /* フッターリンクの上下マージン調整 */
  .footer-bottom { height: auto; padding: 1px 0 6px 0; }
  .footer-bottom-links { gap: 3px 16px; }
}

/* ================================================================
   Responsive - Mobile (max-width: 767px)
   ================================================================ */
@media (max-width: 767px) {
  :root { --header-height: 40px; }
  .site-header { background: var(--color-black); }
  .header-inner { padding: 0 16px; }
  .header-logo { font-size: 28px; }
  .header-nav-list { display: none; }
  .hamburger {
    display: block; position: relative; width: 28px; height: 20px;
    background: none; border: none; z-index: 1001;
  }
  .hamburger span {
    position: absolute; left: 50%; width: 28px; height: 1px;
    background: var(--color-white); transform: translateX(-50%);
    transition: transform 0.3s, opacity 0.2s;
  }
  .hamburger span:nth-child(1) { top: 0; }
  .hamburger span:nth-child(2) { top: 10px; }
  .hamburger span:nth-child(3) { bottom: 0; }
  .hamburger.is-active span:nth-child(1) { top: 50%; transform: translateX(-50%) translateY(-50%) rotate(45deg); }
  .hamburger.is-active span:nth-child(2) { opacity: 0; }
  .hamburger.is-active span:nth-child(3) { bottom: auto; top: 50%; transform: translateX(-50%) translateY(-50%) rotate(-45deg); }

  .hero-section { height: 100vw; margin-top: 48px; }
  .page-header { padding-top: 40px; }
  .page-header-title { margin-top: 0; }
  .page-header--yellow .page-header-title { margin-top: 0; }

  .project-list-grid { grid-template-columns: 1fr; }
  .project-all-grid { grid-template-columns: 1fr; }
  .proto-grid { grid-template-columns: 1fr; }
  .detail-images { grid-template-columns: 1fr; gap: 8px; }
  .related-work-grid { grid-template-columns: 1fr; gap: 12px; }
  .top-map-grid { grid-template-columns: 1fr; }
  .top-hero-section { padding-top: 0; margin-top: 0; }
  .top-hero-video {
    margin: 0 !important;
    aspect-ratio: 1/1;
  }
  .top-hero-copy {
    padding: 40px var(--section-px);
  }
  /* スタッキングスクロール：モバイルでは下部の余白を削除 */
  .top-block {
    padding-bottom: 0;
  }
  .top-block-text {
    padding-bottom: 24px;
  }
  /* 固定されるセクションの下部余白をSPでは削除 */
  .stack-item:not(:last-child) > section:not(.top-hero-section) {
    padding-bottom: 0;
  }

  /* v3ブロック：SP用正方形レイアウト */
  .top-fullscreen-video,
  .top-fullscreen-image {
    height: auto;
    aspect-ratio: 1 / 1;
  }
  /* 画像＋テキスト一体ブロック：正方形画像＋正方形テキストの縦積み */
  .top-fullscreen-image--with-text {
    aspect-ratio: auto;
  }
  .top-fullscreen-image--with-text img {
    aspect-ratio: 1 / 1;
    object-fit: cover;
  }
  .top-fullscreen-video-logo {
    font-size: clamp(24px, 8vw, 40px);
    letter-spacing: 0.1em;
  }
  .top-intro-block {
    min-height: auto;
    aspect-ratio: 1 / 1;
    padding: 24px var(--section-px);
  }
  .top-text-overlay {
    min-height: auto;
    aspect-ratio: 1 / 1;
    padding: 24px var(--section-px);
  }
  .top-text-overlay h2 {
    font-size: clamp(18px, 5vw, 28px);
    margin-bottom: 16px;
    white-space: normal;
  }
  .top-text-overlay p {
    font-size: clamp(12px, 3vw, 16px);
    line-height: 1.8;
  }

  .cta-arrow-btn, .cta-arrow-outline { font-size: 16px; padding: 14px 28px; gap: 10px; }
  .btn-submit { font-size: 16px; padding: 16px 48px; }

  .recruit-header { font-size: 18px; padding: 16px 0; }
  .recruit-icon { font-size: 22px; }
  .recruit-body-inner { padding: 20px; }
  .recruit-table th { width: 100px; font-size: 12px; padding: 8px 12px 8px 0; }
  .recruit-table td { font-size: 12px; }

  .contact-form .form-row { flex-direction: column; gap: 8px; }
  .contact-form .form-label { min-width: auto; }

  .footer-nav-list { flex-wrap: wrap; gap: 16px; }
  .footer-nav-list a { font-size: 12px; }
  .footer-copy { font-size: 11px; }
  .footer-bottom { height: auto; padding: 1px 0 6px 0; }
  .footer-bottom-links { gap: 3px 16px; flex-wrap: wrap; padding: 0 16px; }
  .footer-bottom-links a { font-size: 11px; }
  .footer-logo-text { margin-bottom: -0.15em; }

  .page-header + .ai-search-section {
    padding-top: 0 !important;
  }
  .ai-search-section iframe {
    margin-top: 0 !important;
  }
  .ai-search-wrap { height: 48px; padding: 0 16px; border-radius: 24px; }
  .ai-suggestion-link { font-size: 14px; }

  .filter-tab { font-size: 12px; padding: 8px 16px; }
}

/* ================================================================
   Scroll Fade-in Animations
   ================================================================ */
/* Base fade-in (from bottom) */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}
/* Delayed fade-in for staggered appearance */
.fade-in.fade-in-delay {
  transition-delay: 0.3s;
}
/* Hero video: fade only, no vertical movement */
.top-hero-video.fade-in {
  transform: none;
}
.top-hero-video.fade-in.is-visible {
  transform: none;
}
/* Stack container内のfade-in: 位置ジャンプ防止のためtranslateYを使わない */
.stack-container .fade-in {
  transform: none;
}
.stack-container .fade-in.is-visible {
  transform: none;
}

/* Reveal from left to right with fade-in (wipe + fade effect for block copy text) */
.fade-in-left {
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.fade-in-left::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-white);
  transform: translateX(0);
  transition: transform 1s ease-out 0.3s; /* delay wipe until fade starts */
}
/* Yellow background blocks */
.top-block--yellow .fade-in-left::after,
.top-hero-copy .fade-in-left::after {
  background: var(--color-primary);
}
.fade-in-left.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-in-left.is-visible::after {
  transform: translateX(100%);
}

/* Staggered delay for child elements */
.fade-in-stagger > *:nth-child(1) { transition-delay: 0s; }
.fade-in-stagger > *:nth-child(2) { transition-delay: 0.15s; }
.fade-in-stagger > *:nth-child(3) { transition-delay: 0.3s; }
.fade-in-stagger > *:nth-child(4) { transition-delay: 0.45s; }

/* Soft wipe: fade-in + gradient overlay sliding right */
@keyframes fadeInUp {
  0% { opacity: 0; transform: translateY(20px); }
  100% { opacity: 1; transform: translateY(0); }
}
@keyframes overlaySlideRight {
  0% { transform: translateX(0); }
  100% { transform: translateX(100%); }
}
.fade-in-wipe {
  position: relative;
  opacity: 0;
  transform: translateY(20px);
  overflow: hidden;
}
.fade-in-wipe::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent 0%, var(--color-primary) 40%);
  pointer-events: none;
  z-index: 1;
}
/* White background blocks use white overlay */
.top-block--white .fade-in-wipe::before,
.cat-intro-white .fade-in-wipe::before,
.stack-item--white .fade-in-wipe::before {
  background: linear-gradient(90deg, transparent 0%, var(--color-white) 40%);
}
.fade-in-wipe.is-visible {
  animation: fadeInUp 0.8s ease-out forwards;
}
.fade-in-wipe.is-visible::before {
  animation: overlaySlideRight 1.2s ease-out 0.2s forwards;
}
/* Staggered animation delay for fade-in-wipe */
.fade-in-stagger > .fade-in-wipe:nth-child(1).is-visible { animation-delay: 0s; }
.fade-in-stagger > .fade-in-wipe:nth-child(1).is-visible::before { animation-delay: 0.2s; }
.fade-in-stagger > .fade-in-wipe:nth-child(2).is-visible { animation-delay: 0.25s; }
.fade-in-stagger > .fade-in-wipe:nth-child(2).is-visible::before { animation-delay: 0.45s; }
.fade-in-stagger > .fade-in-wipe:nth-child(3).is-visible { animation-delay: 0.5s; }
.fade-in-stagger > .fade-in-wipe:nth-child(3).is-visible::before { animation-delay: 0.7s; }

/* Disable animations for reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  .fade-in,
  .fade-in-left,
  .fade-in-wipe {
    opacity: 1;
    transform: none;
    transition: none;
    animation: none;
  }
  .fade-in-left::after {
    display: none;
  }
}

/* Hide GDAI floating button — triggered via header AI button instead */
#gd-ai-widget-btn { display: none !important; }

/* ================================================================
   Scroll Progress Marker (PC only, TOP page)
   ================================================================ */
.scroll-marker {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 14px;
  z-index: 900;
  width: 32px; /* Fixed width to prevent jumping */
}
.scroll-marker-item {
  width: 20px;
  height: 2px;
  background: rgba(0, 0, 0, 0.12);
  border-radius: 1px;
  transition: background 0.3s, width 0.3s;
  cursor: pointer;
}
.scroll-marker-item:hover {
  background: rgba(0, 0, 0, 0.25);
}
.scroll-marker-item.is-active {
  background: var(--color-black);
  width: 24px;
}
/* Hide on mobile */
@media (max-width: 768px) {
  .scroll-marker { display: none; }
}