/* ============================================================
   SpatialGenerator — style.css
   カラートークン: AppColors (Components.swift) 準拠
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;900&family=Noto+Sans+JP:wght@400;500;600;700;900&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
  /* AppColors: 背景グラデーション */
  --gradient-start:  #7BDCC5;   /* gradientStart  Fresh Mint  */
  --gradient-end:    #E8C9B8;   /* gradientEnd    Soft Peach  */

  /* AppColors: 機能別アクセント 6色 */
  --c-spatial:      #5DC98A;   /* spatialMain      空間オーディオ */
  --c-tracking:     #5B9FED;   /* trackingMain     ヘッドトラッキング */
  --c-waveform:     #9580DD;   /* waveformMain     波形・音色 */
  --c-fluctuation:  #E6D058;   /* fluctuationMain  音のゆらぎ */
  --c-background:   #FFA056;   /* backgroundMain   背景音 */
  --c-timer:        #E57088;   /* timerMain        タイマー */

  --c-yellow:       #f2cb30;   /* yellowAccent     黄色アクセント */
  --c-green:        #00FF00;   /* greenAccent      緑アクセント */
  --c-blue:        #0000FF;   /* blueAccent       青アクセント */

  /* AppColors: アクションボタン */
  --c-start:  #40A0C7;         /* startButton  CTA */
  --c-stop:   #EA6B5D;         /* stopButton   警告・注意 */

  /* AppColors: 基礎カラー */
  --card-bg:        #FDFCFA;   /* cardBackground   Soft Ivory */
  --shadow:         #4A433E;   /* shadowColor      Shadow Brown */
  --text-main:      #2C2A28;   /* textMain         Deep Charcoal */
  --text-sub:       #6B7580;   /* textSecondary    Neutral Gray */
  --text-on-color:  #FDFCFA;   /* textOnColor      色付き背景上の白 */

  /* レイアウト */
  --max-width:    1200px;
  --nav-h:        72px;
  --section-py:   clamp(80px, 10vh, 130px);
  --container-px: clamp(20px, 5vw, 60px);

  /* タイポグラフィ */
  --font-en:   'Inter', sans-serif;
  --font-ja:   'Noto Sans JP', sans-serif;

  /* トランジション */
  --ease-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--font-ja);
  color: var(--text-main);
  background: transparent;
  min-height: 100vh;
  line-height: 1.85;
}

/* GPUレイヤーの固定背景グラデーション (スクロール時の再描画ゼロ) */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background: linear-gradient(160deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
  pointer-events: none;
}

img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

.color.yellow { color: var(--c-yellow); }
.img_color_yellow { filter: invert(87%) sepia(35%) saturate(1065%) hue-rotate(345deg) brightness(101%) contrast(92%); }

/* ---------- Scroll Progress Bar ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--gradient-start), var(--c-start), var(--gradient-end));
  transform-origin: left;
  transform: scaleX(0);
  z-index: 9998;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--container-px);
  transition: background 0.4s var(--ease-smooth), backdrop-filter 0.4s;
}
.nav.is-scrolled {
  background: rgba(253, 252, 250, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 rgba(74,67,62,0.08);
}

.nav__logo {
  font-family: var(--font-en);
  font-size: clamp(14px, 1.4vw, 18px);
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-main);
  position: relative;
  z-index: 1001;
}
.nav__logo span.c_spatial {
  color: var(--c-spatial);
}
.nav__logo span.c_white {
  color: var(--text-on-color);
}

.nav__menu-btn {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
  position: relative;
  z-index: 1001;
  padding: 8px 0;
}
.nav__menu-btn .hamburger {
  width: 22px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.nav__menu-btn .hamburger span {
  display: block;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: transform 0.4s var(--ease-smooth), opacity 0.3s;
}
.nav__menu-btn.is-open .hamburger span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav__menu-btn.is-open .hamburger span:nth-child(2) {
  opacity: 0;
}
.nav__menu-btn.is-open .hamburger span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ---------- Full Screen Overlay Menu ---------- */
.nav__overlay {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  clip-path: circle(0% at calc(100% - 60px) 36px);
  transition: clip-path 0.6s cubic-bezier(0.77, 0, 0.175, 1);
  pointer-events: none; /* 閉じているときはイベントを通過させる */
}
.nav__overlay.is-open {
  clip-path: circle(150% at calc(100% - 60px) 36px);
  pointer-events: auto; /* 開いているときのみイベントを受け取る */
}
.nav__overlay-list {
  text-align: center;
}
.nav__overlay-list li {
  overflow: hidden;
  margin-bottom: 12px;
}
.nav__overlay-list a {
  font-family: var(--font-ja);
  font-size: clamp(28px, 5vw, 52px);
  font-weight: 700;
  color: var(--text-main);
  display: inline-block;
  transform: translateY(100%);
  transition: transform 0.5s var(--ease-smooth), color 0.3s;
}
.nav__overlay.is-open .nav__overlay-list a {
  transform: translateY(0);
}
.nav__overlay-list a:hover { color: var(--c-start); }

/* Stagger delay for nav links */
.nav__overlay-list li:nth-child(1) a { transition-delay: 0.1s; }
.nav__overlay-list li:nth-child(2) a { transition-delay: 0.15s; }
.nav__overlay-list li:nth-child(3) a { transition-delay: 0.2s; }
.nav__overlay-list li:nth-child(4) a { transition-delay: 0.25s; }
.nav__overlay-list li:nth-child(5) a { transition-delay: 0.3s; }

.nav__overlay-footer {
  position: absolute;
  bottom: 40px;
  font-size: 12px;
  color: var(--text-sub);
  letter-spacing: 0.1em;
}

/* ---------- Container ---------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--container-px);
}

/* ---------- Section-card: アプリの cardBackground.opacity(0.8) + 角丸 を再現 ---------- */
/* hero・footer 以外の全セクション container をカード化 */
section:not(#hero) > .container {
  background: rgba(253, 252, 250, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: 28px;
  /* 内部パディング: 横は --container-px 継承、縦は独自設定 */
  padding-top:    clamp(40px, 5vw, 64px);
  padding-bottom: clamp(40px, 5vw, 64px);
  /* アプリ shadowColor.opacity(0.15) 相当 */
  box-shadow:
    0 12px 40px rgba(74, 67, 62, 0.12),
    inset 0 1.5px 0 rgba(255, 255, 255, 0.72);
  /* カードを画面端から浮かせる: グラデーション背景が両サイドに見える */
  max-width: min(var(--max-width), calc(100% - clamp(24px, 6vw, 80px)));
}

/* disclaimer カード: 警告色ボーダーを追加 */
#disclaimer > .container {
  border: 1.5px solid rgba(234, 107, 93, 0.28);
  background: rgba(253, 252, 250, 0.88);
}

/* ---------- Section base ---------- */
section {
  padding: var(--section-py) 0;
  position: relative;
  overflow: visible; /* カードの shadow がクリップされないよう visible に */
}
section.pad_b0 {
  padding-bottom: 0;
}

.section-label {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-sub);
  margin-bottom: 16px;
  display: block;
}

.section-title {
  font-size: clamp(26px, 3.5vw, 44px);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 32px;
}

.section-text {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text-sub);
}

/* ---------- HERO ---------- */
#hero {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-bottom: clamp(60px, 8vh, 100px);
  padding-top: calc(var(--nav-h) + 60px);
  position: relative;
  overflow: hidden;
  background: #06081a;   /* Three.js ロード前のフォールバック */
}

#brainwave-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  display: block;
}

#hero .container {
  position: relative;
  z-index: 1;
}

/* ---------- DISCLAIMER LAYOUT ---------- */
.disclaimer__layout {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}

.disclaimer__screenshot {

  display: flex;
  justify-content: center;
  align-items: center;
  flex-shrink: 0;

  display: none;
}

.disclaimer__phone-frame {
  width: clamp(200px, 22vw, 280px);
  border-radius: 44px;
  overflow: hidden;
  box-shadow:
    0 30px 80px rgba(44, 42, 40, 0.22),
    0 0 0 1.5px rgba(44, 42, 40, 0.08);
}

.disclaimer__phone-frame img {
  width: 100%;
  height: auto;
  display: block;
}

/* ダーク背景用: hero 内テキストを白系に上書き */
.hero__eyebrow {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: #5DC98A;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.hero__eyebrow::before {
  content: '';
  display: block;
  width: 32px;
  height: 1.5px;
  background: #5DC98A;
}

.hero__title {
  font-family: var(--font-en);
  font-size: clamp(44px, 8.5vw, 110px);
  font-weight: 900;
  line-height: 1.0;
  letter-spacing: -0.03em;
  color: #ffffff;
  margin-bottom: 32px;
}
.hero__title .char {
  display: inline-block;
}

.hero__subtitle {
  font-size: clamp(18px, 2.2vw, 26px);
  font-weight: 700;
  color: rgba(255,255,255,0.92);
  margin-bottom: 20px;
  max-width: 700px;
  line-height: 1.5;
}

.hero__desc {
  font-size: clamp(14px, 1.4vw, 17px);
  color: rgba(255,255,255,0.65);
  max-width: 560px;
  line-height: 1.85;
  margin-bottom: 48px;
}

.hero__actions {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

/* hero 内の outline ボタン: 白枠・白文字 */
#hero .btn--outline {
  color: rgba(255,255,255,0.90);
  border-color: rgba(255,255,255,0.35);
}
#hero .btn--outline:hover {
  border-color: rgba(255,255,255,0.80);
}

.hero__scroll-hint {
  position: absolute;
  bottom: 36px; right: var(--container-px);
  font-family: var(--font-en);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.45);
  writing-mode: vertical-lr;
  display: flex;
  align-items: center;
  gap: 10px;
}
.hero__scroll-hint::after {
  content: '';
  display: block;
  width: 1.5px;
  height: 40px;
  background: rgba(255,255,255,0.45);
  animation: scrollDown 2s ease-in-out infinite;
}
@keyframes scrollDown {
  0%   { transform: scaleY(0); transform-origin: top; }
  50%  { transform: scaleY(1); transform-origin: top; }
  51%  { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 16px 36px;
  border-radius: 60px;
  transition: transform 0.3s var(--ease-bounce), box-shadow 0.3s var(--ease-smooth), background 0.3s;
  position: relative;
  overflow: hidden;
}
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.15);
  opacity: 0;
  transition: opacity 0.3s;
}
.btn:hover::after { opacity: 1; }
.btn:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(74,67,62,0.18); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--c-start);
  color: var(--text-on-color);
  box-shadow: 0 6px 24px rgba(64,160,199,0.35);
}
.btn--outline {
  background: transparent;
  color: var(--text-main);
  border: 1.5px solid rgba(44,42,40,0.25);
}
.btn--outline:hover { border-color: var(--text-main); }

/* CTA section btn — カード hover と統一 (translateY -6px / same shadow) */
#cta .btn:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(74,67,62,0.12);
}

/* ---------- DISCLAIMER Section ---------- */
/* 警告ボーダーは container のカードに直接付与 (#disclaimer > .container 参照) */
#disclaimer {
  padding: 48px 0;
  background: transparent;
}
.disclaimer-box {

  padding: 36px 40px;
  /*
    border: 2px solid var(--c-stop);
  border-radius: 16px;
  background: rgba(253,252,250,0.7);
  backdrop-filter: blur(8px);
  */
}
.disclaimer-box__title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-stop);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.disclaimer-box ul {
  display: grid;
  /* 画面幅に応じて自動で列数を調整: min 280px, max 1fr (均等割り) */
  /*
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  */
  gap: 8px 24px;
}
.disclaimer-box ul li {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
  padding-left: 1.2em;
  position: relative;
}
.disclaimer-box ul li::before {
  content: attr(data-prefix);
  position: absolute;
  left: 0;
  font-size: 13px;
}

/* ---------- ABOUT Section ---------- */
#about {
  background: transparent;
}
.about__grid {

}
.about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  margin-top: 40px;
  border: 1.5px solid rgba(44,42,40,0.1);
  border-radius: 16px;
  overflow: hidden;
}
.about__stat {
  padding: 28px 24px;
  background: rgba(253,252,250,0.7);
  border-right: 1.5px solid rgba(44,42,40,0.1);
  border-bottom: 1.5px solid rgba(44,42,40,0.1);
}
.about__stat:nth-child(2n) { border-right: none; }
.about__stat:nth-last-child(-n+2) { border-bottom: none; }
.about__stat-num {
  font-family: var(--font-en);
  font-size: clamp(28px, 3.5vw, 42px);
  font-weight: 900;
  color: var(--c-spatial);
  line-height: 1;
  margin-bottom: 6px;
}
.about__stat-label {
  font-size: 12px;
  color: var(--text-sub);
  letter-spacing: 0.04em;
}
.about__list {
  margin-top: 24px;
  border-top: 1.5px solid rgba(44,42,40,0.12);
  display: grid;
  grid-template-columns: 1fr 1fr;/*横2段組*/
}
.about__list-item {
  padding: 18px 0;
  border-bottom: 1.5px solid rgba(44,42,40,0.12);
  display: flex;
  align-items: flex-start;
  gap: 16px;
  font-size: 15px;
  color: var(--text-sub);
}
.about__list-item .dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--c-spatial);
  flex-shrink: 0;
  margin-top: 7px;
}

/* ---------- FEATURES Section ---------- */
#features {
  background: transparent;
}
.features__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 60px;
}
.feature-card {
  padding: clamp(28px, 4vw, 52px);
  background: rgba(253,252,250,0.8);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  position: relative;
  overflow: hidden;
  cursor: default;
  /* transform は GSAP が管理するため CSS transition から除外 */
  transition: box-shadow 0.3s;
  will-change: transform, opacity;
  /* GSAP 初期化前にカードを非表示にして FOUC を防ぐ */
  opacity: 0;
}
.feature-card:hover {
  /* transform は GSAP の hover アニメーションで制御 */
  box-shadow: 0 16px 48px rgba(74,67,62,0.12);
}

.feature-card--wide {
  grid-column: span 2;
}
.feature-card__num {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 600;
  color: var(--accent-color, var(--c-spatial));
  letter-spacing: 0.18em;
  margin-bottom: 20px;
}
.feature-card__icon {
  font-size: 32px;
  margin-bottom: 16px;
  line-height: 1;
}
.feature-card__title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-main);
}
.feature-card__text {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.8;
}
.feature-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}
.feature-card__tag {
  font-size: 11px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  background: rgba(0,0,0,0.06);
  color: var(--text-sub);
}

.feature-card__accent {
  display: none;
  position: absolute;
  top: 0; right: 0;
  width: 80px; height: 80px;
  border-radius: 0 20px 0 80px;
  background: var(--accent-color, var(--c-spatial));
  opacity: 0.12;
}

/* ---------- USE CASES Section ---------- */
#usecases {
  background: transparent;
}
.usecases__list {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.usecase-card {
  padding: 40px 36px;
  background: rgba(253,252,250,0.8);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  position: relative;
  overflow: hidden;
  /* transform は GSAP が管理するため CSS transition から除外 */
  transition: box-shadow 0.3s;
  will-change: transform, opacity;
  /* GSAP 初期化前にカードを非表示にして FOUC を防ぐ */
  opacity: 0;
}
.usecase-card:hover {
  /* transform は GSAP の hover アニメーションで制御 */
  box-shadow: 0 16px 48px rgba(74,67,62,0.12);
}
.usecase-card__icon {
  font-size: 36px;
  margin-bottom: 20px;
}
.usecase-card__title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
}
.usecase-card__text {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.8;
}
.usecase-card__note {
  font-size: 11px;
  color: var(--text-sub);
  opacity: 0.7;
  margin-top: 16px;
  line-height: 1.6;
}
.usecase-card__accent {
  display: none;
  position: absolute;
  top: 0; right: 0;
  width: 80px; height: 80px;
  border-radius: 0 20px 0 80px;
  opacity: 0.12;
}

/* ---------- TESTIMONIALS Section ---------- */
#testimonials {
  display: none;
  background: transparent;
  overflow: hidden;
}
.testimonials__header {
  margin-bottom: 56px;
}
.testimonials__track-wrap {
  overflow: hidden;
  mask-image: linear-gradient(90deg, transparent, black 8%, black 92%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, black 8%, black 92%, transparent);
}
.testimonials__track {
  display: flex;
  gap: 24px;
  width: max-content;
  cursor: grab;
}
.testimonials__track:active { cursor: grabbing; }
.testimonial-card {
  width: clamp(280px, 35vw, 420px);
  flex-shrink: 0;
  padding: 36px;
  background: rgba(253,252,250,0.8);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  border-top: 3px solid var(--c-spatial);
}
.testimonial-card:nth-child(3n+2) { border-top-color: var(--c-tracking); }
.testimonial-card:nth-child(3n+3) { border-top-color: var(--c-waveform); }
.testimonial-card__text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-main);
  margin-bottom: 28px;
  quotes: "「" "」";
}
.testimonial-card__text::before { content: open-quote; }
.testimonial-card__text::after  { content: close-quote; }
.testimonial-card__author {
  display: flex;
  align-items: center;
  gap: 14px;
}
.testimonial-card__avatar {
  width: 42px; height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-on-color);
  flex-shrink: 0;
}
.testimonial-card__name {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
}
.testimonial-card__role {
  font-size: 11px;
  color: var(--text-sub);
}

/* ---------- CTA Section ---------- */
#cta {
  text-align: center;
  padding: var(--section-py) 0;
  background: transparent;
}
.cta__title {
  font-size: clamp(32px, 5vw, 64px);
  font-weight: 900;
  line-height: 1.15;
  color: var(--text-main);
  margin-bottom: 48px;
}
.cta__text {
  font-size: 17px;
  color: var(--text-main);
  max-width: 650px;
  margin: 0 auto 48px;
  line-height: 1.8;
}
.cta__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}
.cta__badge {
  margin-top: 40px;
  font-size: 12px;
  color: var(--text-sub);
  letter-spacing: 0.05em;
}

/* ---------- FOOTER ---------- */
/* セクションカードと同じ cardBackground ガラスモーフィズムを適用                 */
/* 固定グラデーション背景が透けて見え、ページ全体の統一感を維持する               */
.footer {
  padding: 60px 0 40px;
  background: rgba(253, 252, 250, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-top: 1.5px solid rgba(255, 255, 255, 0.72);
  box-shadow: inset 0 1.5px 0 rgba(255, 255, 255, 0.72);
}
.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer__brand-name {
  font-family: var(--font-en);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-main);
  margin-bottom: 14px;
}
.footer__brand-desc {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.75;
  max-width: 260px;
}
.footer__col-title {
  font-family: var(--font-en);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-sub);
  margin-bottom: 18px;
}
.footer__nav-list li {
  margin-bottom: 10px;
}
.footer__nav-list a {
  font-size: 14px;
  color: var(--text-sub);
  position: relative;
  display: inline-block;
}
.footer__nav-list a::after {
  content: '';
  position: absolute;
  bottom: -1px; left: 0;
  width: 100%; height: 1px;
  background: var(--c-start);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease-smooth);
}
.footer__nav-list a:hover::after { transform: scaleX(1); }
.footer__nav-list a:hover { color: var(--text-main); }

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1.5px solid rgba(44,42,40,0.08);
  font-size: 12px;
  color: var(--text-sub);
  letter-spacing: 0.04em;
}

/* ---------- Utilities ---------- */
.reveal {
  opacity: 0;
  transform: translateY(50px);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.7s var(--ease-smooth), transform 0.7s var(--ease-smooth);
}

.divider {
  /* カード間の余白: 線は不要、グラデーション背景がセパレーターとして機能 */
  height: 0;
  background: transparent;
  margin: 0;
}

/* ---------- Desktop Navigation (≥ 900px) ---------- */
@media (min-width: 900px) {
  /* ハンバーガーボタンを非表示 */
  .nav__menu-btn {
    display: none;
  }

  /* フルスクリーンオーバーレイを横並びインラインナビに変換 */
  .nav__overlay {
    position: static;
    inset: auto;
    background: transparent;
    clip-path: none !important;
    display: flex;
    flex-direction: row;
    align-items: center;
    pointer-events: auto;
    transition: none;
    z-index: auto;
  }

  .nav__overlay-list {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 2px;
    text-align: left;
  }

  .nav__overlay-list li {
    overflow: visible;
    margin-bottom: 0;
  }

  /* デスクトップ用リンクスタイル (アニメーションをリセット) */
  .nav__overlay-list a,
  .nav__overlay.is-open .nav__overlay-list a {
    font-family: var(--font-ja);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--text-main);
    transform: none !important;
    transition: color 0.2s, background 0.2s !important;
    transition-delay: 0s !important;
    padding: 7px 14px;
    border-radius: 24px;
  }

  .nav__overlay-list a:hover {
    color: var(--c-start);
    background: rgba(64, 160, 199, 0.12);
  }

  /* フッターテキストは非表示 */
  .nav__overlay-footer {
    display: none;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  :root { --section-py: 64px; }

  .hero__title { letter-spacing: -0.02em; }

  .disclaimer__layout {
    grid-template-columns: 1fr;
  }
  .disclaimer__screenshot {
    order: -1;
    margin-bottom: 8px;
  }
  .disclaimer__phone-frame {
    width: clamp(160px, 48vw, 220px);
  }

  .about__grid { grid-template-columns: 1fr; }
  .about__stats { grid-template-columns: 1fr 1fr; }/*縦2段組*/
  .about__list { grid-template-columns: 1fr; }/*縦1段組*/

  .features__grid { grid-template-columns: 1fr; }
  .feature-card--wide { grid-column: span 1; }

  .footer__inner { grid-template-columns: 1fr 1fr; }
  .footer__bottom { flex-direction: column; gap: 8px; text-align: center; }
}

@media (max-width: 480px) {
  .footer__inner { grid-template-columns: 1fr; }
  .hero__actions { flex-direction: column; align-items: flex-start; }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .reveal,
  .feature-card,
  .usecase-card { opacity: 1; transform: none; }
}