/* ==========================================================================
Citibear style.css
カラー：メイン #26A7E1 / アクセント #FF1492 / 背景 #FAFCFD
フォント：Noto Sans JP（日本語）/ Poppins（英数字）
========================================================================== */

/* ===== CSS変数 ===== */
:root {
  --color-primary: #26A7E1;
  --color-primary-dark: #1c8bc0;
  --color-accent: #FF1492;
  --color-bg: #FAFCFD;
  --color-surface: #FFFFFF;
  --color-text: #222222;
  --color-subtext: #666666;
  --color-border: rgba(34, 34, 34, 0.08);

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

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 28px;
  --radius-full: 999px;

  --shadow-sm: 0 4px 16px rgba(34, 34, 34, 0.06);
  --shadow-md: 0 12px 32px rgba(34, 34, 34, 0.08);
  --shadow-lg: 0 20px 48px rgba(34, 34, 34, 0.12);

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4rem;
  --space-7: 6rem;
  --space-8: 9rem;

  --container-width: 1200px;
  --header-height: 80px;
  --transition: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ===== リセット / ベース ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-jp);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.85;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; border: none; background: none; cursor: pointer; }
h1, h2, h3 { font-weight: 700; line-height: 1.45; }

.hero__eyebrow, .section-eyebrow, .diagram__label, .diagram__step,
.btn, .business__index, .works__stat span {
  font-family: var(--font-en), var(--font-jp);
}

:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; }

/* ===== スキップリンク ===== */
.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--color-primary); color: #fff;
  padding: var(--space-1) var(--space-2); z-index: 200;
}
.skip-link:focus { left: var(--space-2); top: var(--space-2); }

/* ===== コンテナ ===== */
.container { width: 100%; max-width: var(--container-width); margin-inline: auto; padding-inline: var(--space-3); }

/* ===== セクション共通 ===== */
section { padding-block: clamp(5rem, 10vw, var(--space-8)); }

.section-eyebrow {
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  margin-bottom: var(--space-2);
  text-align: center;
}

.section-title {
  font-size: clamp(1.7rem, 3.2vw, 2.5rem);
  margin-bottom: var(--space-6);
  color: var(--color-text);
  text-align: center;
  width: 100%;
}

/* ===== ヘッダー ===== */
.header {
  position: fixed; top: 0; left: 0; width: 100%;
  height: var(--header-height);
  background: rgba(250, 252, 253, 0.85);
  backdrop-filter: blur(12px);
  z-index: 100;
  transition: transform var(--transition), box-shadow var(--transition);
}
.header.is-hidden { transform: translateY(-100%); }
.header.is-scrolled { box-shadow: var(--shadow-sm); }

.header__inner { display: flex; align-items: center; justify-content: space-between; height: 100%; }

.header__logo { display: flex; align-items: center; }
.header__logo-img { height: 42px; width: auto; }

/* ナビゲーション（デスクトップ） */
.nav__list { display: flex; gap: var(--space-3); align-items: center; }
.nav__link { font-size: 0.88rem; font-weight: 500; position: relative; white-space: nowrap; }
.nav__link::after {
  content: ""; position: absolute; left: 0; bottom: -6px;
  width: 0; height: 2px; background: var(--color-accent);
  transition: width var(--transition);
}
.nav__link:hover::after { width: 100%; }

.nav__link--cta {
  background: var(--color-primary); color: #fff;
  padding: 0.6rem 1.3rem; border-radius: var(--radius-full);
  transition: background var(--transition), transform var(--transition);
}
.nav__link--cta:hover { background: var(--color-primary-dark); transform: translateY(-2px); }
.nav__link--cta::after { display: none; }

/* ハンバーガー（モバイル） */
.hamburger { display: none; flex-direction: column; justify-content: center; gap: 6px; width: 44px; height: 44px; z-index: 101; }
.hamburger__line { width: 24px; height: 2px; background: var(--color-text); transition: transform var(--transition), opacity var(--transition); }
.hamburger.is-active .hamburger__line:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.hamburger.is-active .hamburger__line:nth-child(2) { opacity: 0; }
.hamburger.is-active .hamburger__line:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ===== ボタン ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.9rem 2.1rem; border-radius: var(--radius-full);
  font-weight: 600; font-size: 0.95rem;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  min-height: 44px;
}
.btn--primary { background: var(--color-accent); color: #fff; box-shadow: var(--shadow-sm); }
.btn--primary:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.btn--outline { border: 1.5px solid var(--color-primary); color: var(--color-primary); }
.btn--outline:hover { background: var(--color-primary); color: #fff; transform: translateY(-3px); }
.btn--full { width: 100%; }

/* ===== Hero：左スライドショー／右テキスト2カラム構成 ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--color-text);
}

.hero__grid {
  display: grid;
  grid-template-columns: 7fr 3fr;
  align-items: center;
  width: 100%;
  min-height: 100vh;
}

/* 左：縦方向スライドショー */
.hero__slideshow {
  position: relative;
  height: 100vh;
  overflow: hidden;
}

.hero__slideshow-track {
  display: flex;
  flex-direction: column;
  width: 100%;
  animation: heroSlideDown 24s linear infinite;
}

.hero__slideshow-track img {
  width: 100%;
  height: 100vh;
  object-fit: cover;
  flex-shrink: 0;
}

@keyframes heroSlideDown {
  0% { transform: translateY(-50%); }
  100% { transform: translateY(0%); }
}

.hero__slideshow-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(34,34,34,0.15) 0%, rgba(34,34,34,0.45) 100%);
}

@media (prefers-reduced-motion: reduce) {
  .hero__slideshow-track { animation: none; }
}

/* 右：テキスト＆CTA（中央配置） */
.hero__content {
  position: relative;
  color: #fff;
  padding-block: var(--space-6);
  padding-inline: var(--space-5);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero__eyebrow {
  letter-spacing: 0.15em;
  font-size: 0.8rem;
  margin-bottom: var(--space-2);
  opacity: 0.9;
}

.hero__title {
  font-size: clamp(2rem, 4.2vw, 3.2rem);
  margin-bottom: var(--space-4);
  letter-spacing: 0.02em;
}

.hero__subtitle {
  font-size: clamp(0.95rem, 1.4vw, 1.1rem);
  max-width: 40ch;
  margin-bottom: var(--space-5);
  color: rgba(255,255,255,0.92);
}

.hero__cta {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  justify-content: center;
}
.hero__cta .btn--outline { border-color: #fff; color: #fff; }
.hero__cta .btn--outline:hover { background: #fff; color: var(--color-text); }

/* スクロールインジケーター */
.hero__scroll {
  position: absolute;
  bottom: var(--space-3);
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  height: 60px;
  z-index: 1;
}
.hero__scroll-line {
  display: block;
  width: 1px;
  height: 100%;
  background: rgba(255,255,255,0.6);
  animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  50.01% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ----- レスポンシブ ----- */
@media (max-width: 1024px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__slideshow { height: 50vh; }
  .hero__content { padding-block: var(--space-5); padding-inline: var(--space-3); text-align: center; }
  .hero__cta { justify-content: center; }
  .hero { min-height: auto; }
  .hero__grid { min-height: auto; }
}

@media (max-width: 768px) {
  .hero__title { font-size: clamp(1.9rem, 8vw, 2.6rem); }
  .hero__cta { flex-direction: column; align-items: stretch; }
  .hero__slideshow { height: 45vh; }
}

/* ===== Mission（4枚自動切換えスライドショー） ===== */
.mission { display: grid; grid-template-columns: 1.1fr 1fr; align-items: center; gap: var(--space-6); background: var(--color-surface); padding-block: 0; }

.mission__media { position: relative; }
.mission-slideshow {
  position: relative;
  width: 100%;
  min-height: 480px;
  height: 100%;
  overflow: hidden;
}
.mission-slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1.2s ease-in-out;
}
.mission-slide.is-active { opacity: 1; }

.mission__body { padding-block: var(--space-7); text-align: center; }
.mission__title { font-size: clamp(1.5rem, 2.8vw, 2.2rem); margin-bottom: var(--space-3); }
.mission__quote { font-size: clamp(1rem, 1.6vw, 1.2rem); color: var(--color-primary); font-weight: 500; margin-bottom: var(--space-3); }
.mission__text { color: var(--color-subtext); max-width: 40ch; margin-inline: auto; }

/* ===== Problems ===== */
.problems { background: var(--color-bg); }
.problems__heading { text-align: center; max-width: 640px; margin-inline: auto; margin-bottom: var(--space-6); }

.problems__photo { max-width: 480px; margin-inline: auto; margin-bottom: var(--space-6); }
.problems__photo img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  aspect-ratio: 4/3;
  object-fit: contain;
  background: var(--color-surface);
  padding: var(--space-2);
}

.problems__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: var(--space-4); margin-bottom: var(--space-6); }

.problems__card {
  background: rgba(38, 167, 225, 0.05);
  border: 1.5px solid var(--color-primary);
  border-radius: var(--radius-full);
  padding: var(--space-4);
  aspect-ratio: 1/1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow: 0 8px 24px rgba(38, 167, 225, 0.15);
  animation: bubbleFloat 6s ease-in-out infinite;
  transition: transform var(--transition), box-shadow var(--transition);
}
.problems__card:nth-child(1) { animation-delay: 0s; }
.problems__card:nth-child(2) { animation-delay: 1.4s; }
.problems__card:nth-child(3) { animation-delay: 2.8s; }
.problems__card:nth-child(4) { animation-delay: 4.2s; }

.problems__card:hover {
  transform: translateY(-10px) scale(1.03);
  box-shadow: 0 16px 32px rgba(38, 167, 225, 0.25);
}

@keyframes bubbleFloat {
  0%, 100% { transform: translateY(0) translateX(0); }
  25% { transform: translateY(-10px) translateX(4px); }
  50% { transform: translateY(0) translateX(-4px); }
  75% { transform: translateY(10px) translateX(2px); }
}

.problems__num { font-family: var(--font-en); color: var(--color-primary); font-weight: 700; font-size: 1.2rem; margin-bottom: var(--space-2); }
.problems__text { font-size: 0.95rem; font-weight: 500; }
.problems__note { text-align: center; color: var(--color-subtext); font-size: 0.95rem; max-width: 50ch; margin-inline: auto; }

/* ===== Solution：ベン図デザイン ===== */
.solution {
  background: var(--color-surface);
  text-align: center;
}

.solution__lead {
  color: var(--color-subtext);
  max-width: 44ch;
  margin-inline: auto;
  margin-bottom: var(--space-7);
}

.venn {
  position: relative;
  width: 100%;
  max-width: 560px;
  height: 380px;
  margin-inline: auto;
}

.venn__circle {
  position: absolute;
  top: 50%;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: translateY(-50%);
  transition: transform var(--transition);
}

.venn__circle--left {
  left: 30px;
  background: rgba(38, 167, 225, 0.16);
  border: 2px solid var(--color-primary);
}

.venn__circle--right {
  right: 30px;
  background: rgba(255, 20, 146, 0.14);
  border: 2px solid var(--color-accent);
  mix-blend-mode: normal;
}

.venn:hover .venn__circle--left { transform: translateY(-50%) translateX(-8px); }
.venn:hover .venn__circle--right { transform: translateY(-50%) translateX(8px); }

.venn__circle-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  padding-inline: var(--space-3);
}

.venn__circle--left .venn__circle-inner { transform: translateX(-30px); }
.venn__circle--right .venn__circle-inner { transform: translateX(30px); }

.venn__step {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-text);
}

.venn__label {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-text);
}

.venn__circle--left .venn__label { color: var(--color-primary-dark); }
.venn__circle--right .venn__label { color: var(--color-accent); }

.venn__center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  z-index: 2;
  pointer-events: none;
}

.venn__logo-img {
  height: 28px;
  width: auto;
}

.venn__center-text {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-text);
  background: var(--color-surface);
  padding: 0.2rem 0.8rem;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
}

/* ----- レスポンシブ ----- */
@media (max-width: 768px) {
  .venn {
    height: auto;
    max-width: 320px;
  }
  .venn__circle {
    position: relative;
    width: 260px;
    height: 260px;
    margin-inline: auto;
    top: auto;
    left: auto !important;
    right: auto !important;
    transform: none;
  }
  .venn__circle--left { margin-bottom: -70px; }
  .venn__circle--right { margin-top: -70px; }
  .venn__circle--left .venn__circle-inner,
  .venn__circle--right .venn__circle-inner { transform: none; }
  .venn__center {
    position: relative;
    top: auto;
    left: auto;
    transform: none;
    margin-top: var(--space-2);
  }
  .venn:hover .venn__circle--left,
  .venn:hover .venn__circle--right { transform: none; }
}
/* ---------------- Business ---------------- */
.business {
  background: var(--color-bg);
}

.businessitem {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  align-items: center;
  gap: var(--space-6);
  margin-bottom: var(--space-7);
}

.businessitem--reverse {
  direction: rtl;
}

.businessitem--reverse .businessbody {
  direction: ltr;
}

.businessmedia img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  aspect-ratio: 7/5;
  object-fit: cover;
}

.businessbody {
  direction: ltr;
}

.businessindex {
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-1);
}

.businesstitle {
  font-size: clamp(1.3rem, 2.4vw, 1.8rem);
  margin-bottom: var(--space-3);
}

.businesslist {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
}

.businesslist li {
  background: var(--color-surface);
  color: var(--color-primary);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
}

.businesstext {
  color: var(--color-subtext);
  margin-bottom: var(--space-3);
  max-width: 46ch;
}

.businesscta {
  margin-top: var(--space-2);
}

/* AI事業: SRUSH AI / AI WORKER ボタングループ */
.business-btn-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: var(--space-2);
}

/* AI WORKER: アクセントカラー(ピンク)の塗りボタン */
.businesscta--accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.businesscta--accent:hover {
  background: #d10f76;
  border-color: #d10f76;
  color: #fff;
  transform: translateY(-3px);
}

/* footerからのアンカーリンク用スクロール位置調整 */
#ai-solution {
  scroll-margin-top: var(--header-height);
}

/* ---------------- Responsive ---------------- */
@media (max-width: 1024px) {
  .businessitem {
    grid-template-columns: 1fr;
  }
  .businessitem--reverse {
    direction: ltr;
  }
}

@media (max-width: 768px) {
  .businessitem {
    margin-bottom: var(--space-5);
  }
}

@media (max-width: 600px) {
  .business-btn-group {
    flex-direction: column;
    gap: 12px;
  }
}
/* ===== About ===== */
.about { background: var(--color-surface); }
.about__heading { text-align: center; max-width: 640px; margin-inline: auto; margin-bottom: var(--space-6); }

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  grid-template-areas: "tl text tr" "bl text br";
  gap: var(--space-3);
  max-width: 1000px;
  margin-inline: auto;
}
.about__photo--tl { grid-area: tl; }
.about__photo--tr { grid-area: tr; }
.about__photo--bl { grid-area: bl; }
.about__photo--br { grid-area: br; }
.about__photo img { border-radius: var(--radius-md); box-shadow: var(--shadow-sm); width: 100%; height: 100%; aspect-ratio: 1/1; object-fit: cover; }
.about__text-block { grid-area: text; display: flex; align-items: center; justify-content: center; text-align: center; padding: var(--space-3); }
.about__lead { font-size: clamp(1rem, 1.8vw, 1.3rem); font-weight: 500; color: var(--color-text); }

@media (max-width: 1024px) {
  .about__grid { grid-template-columns: 1fr 1fr; grid-template-rows: auto auto auto; grid-template-areas: "tl tr" "text text" "bl br"; }
}
@media (max-width: 768px) {
  .about__grid { grid-template-columns: 1fr 1fr; grid-template-rows: auto auto auto; grid-template-areas: "tl tr" "text text" "bl br"; gap: var(--space-2); }
  .about__lead { font-size: 0.95rem; }
}

/* ===== 左に流れる画像スライドショー ===== */
.slideshow-marquee {
  background: var(--color-bg);
  overflow: hidden;
  padding-block: var(--space-6);
}
.slideshow-marquee__track {
  display: flex;
  gap: var(--space-3);
  width: max-content;
  animation: marqueeLeft 30s linear infinite;
}
.slideshow-marquee__track img {
  width: 320px;
  height: 220px;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}
@keyframes marqueeLeft {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
.slideshow-marquee:hover .slideshow-marquee__track { animation-play-state: paused; }

@media (prefers-reduced-motion: reduce) {
  .slideshow-marquee__track { animation: none; }
}

/* ---------------- CTA ---------------- */
.cta{
  background: var(--gradient-blue-deep);
  color:#fff;
  text-align:center;
}
.cta__title{ font-size: clamp(1.6rem, 3vw, 2.2rem); color:#fff; }
.cta__desc{ margin-top:16px; opacity:0.9; }
.cta__actions{
  margin-top: 40px;
  display:flex; justify-content:center; align-items:center; gap: 20px; flex-wrap:wrap;
}

/* =========================
   フッター
========================== */
footer {
  background-color: #163a63;
  color: #fff;
  padding: 36px 0 20px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.4fr;
  gap: 32px;
  margin-bottom: 24px;
  align-items: start;
}

.footer-logo {
  height: 28px;
  width: auto;
  margin-bottom: 10px;
  display: block;
}

.footer-desc {
  font-size: 13px;
  color: #aaa;
  line-height: 1.7;
  margin-bottom: 8px;
}

.footer-company {
  font-size: 13px;
  color: #aaa;
  margin-bottom: 20px;
}

.footer-column h3 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 14px;
  color: #4db8f0;
  letter-spacing: 0.02em;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 8px;
  font-size: 13px;
  color: #aaa;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.4;
}

.footer-links a {
  color: #aaa;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #fff;
}

.footer-contact__icon {
  color: #4db8f0;
  font-size: 13px;
  margin-top: 3px;
  flex-shrink: 0;
}

.footer-social {
  display: flex;
  gap: 10px;
  margin-top: 4px;
}

.social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  transition: background-color 0.2s ease;
  text-decoration: none;
}

.social-icon:hover {
  background-color: #4db8f0;
}

.social-icon i {
  color: #fff;
  font-size: 16px;
}

.footer-bottom {
  text-align: center;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #666;
  font-size: 12px;
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 560px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

/* ---------------- Animations ---------------- */
.fade-in{
  opacity:0; transform: translateY(24px);
  transition: opacity .7s ease, transform .7s ease;
}
.fade-in.is-visible{ opacity:1; transform: translateY(0); }

/* ---------------- Responsive ---------------- */
@media (max-width: 1024px){
  .l-header__nav{ gap: 20px; }
  .hero__inner{ flex-direction:column; text-align:left; justify-content:center; align-items:flex-start;}
  .hero__text{ max-width: 100%; }
  .pain__layout{ grid-template-columns: 1fr; }
  .pain__visual{ order:-1; }
  .pain__visual img{ max-width: 200px; }
  .story__grid{ grid-template-columns: 1fr; }
  .feature__grid{ grid-template-columns: repeat(2,1fr); }
  .flow__analysis-grid{ grid-template-columns: repeat(2,1fr); }
  .usability__grid{ grid-template-columns: 1fr; }
  .security__grid{ grid-template-columns: 1fr; }
}

@media (max-width: 640px){
  .sp-only{ display:inline; }
  .l-header__toggle{ display:flex; }
  .l-header__cta-pc{
    padding: 8px 16px;
    font-size: 0.78rem;
  }
  .l-header__nav .l-header__nav-cta{ display:none; }
  .l-header__nav{
    position:fixed;
    top: 62px;
    left:0; right:0;
    background:#fff;
    flex-direction:column;
    align-items:flex-start;
    gap: 0;
    padding: 8px 24px 20px;
    box-shadow: 0 12px 24px rgba(0,0,0,0.08);
    border-bottom: 1px solid var(--color-border);
    max-height:0;
    overflow:hidden;
    opacity:0;
    transition: max-height .35s ease, opacity .3s ease;
  }
  .l-header__nav.is-open{
    max-height: 500px;
    opacity:1;
  }
  .l-header__nav a{
    width:100%;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
  }
  .l-header__nav a:last-of-type{ border-bottom:none; }
  section{ padding: 60px 0; }
  .hero{ padding-top: 100px; }
  .hero__title{ font-size: 1.8rem; }

  .pain__grid--4{ grid-template-columns: 1fr; }
  .pain__card{ flex-direction:row; align-items:center; }
  .pain__card .icon{ flex-shrink:0; width:44px; height:44px; }
  .pain__card .icon i{ font-size:1.2rem; }
  .pain__card p{ font-size:0.88rem; }
  .pain__visual img{ max-width: 160px; }

  .story__card{ padding: 20px; }
  .story__card h3{ font-size:0.98rem; margin-bottom: 18px; }
  .story__before, .story__after{ padding: 18px 16px; }
  .check-list li{ font-size:0.84rem; padding-left: 24px; }
  .story__label{ font-size:0.7rem; padding: 4px 14px; }

  .flow__row{ grid-template-columns: 1fr; text-align:left; padding: 24px; }
  .flow__row-num{ margin-bottom: 8px; }
  .flow__analysis-grid{ grid-template-columns: 1fr; }

  .feature__grid{ grid-template-columns: 1fr; }
  .cta__actions{ flex-direction:column; }
  .l-footer__inner{ flex-direction:column; }
/* ===== トップへ戻るボタン ===== */
.to-top {
  position: fixed; right: var(--space-3); bottom: var(--space-3);
  width: 48px; height: 48px; border-radius: var(--radius-full);
  background: var(--color-primary); color: #fff; font-size: 1.2rem;
  box-shadow: var(--shadow-md); opacity: 0; visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition), transform var(--transition), background var(--transition);
  z-index: 90;
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { background: var(--color-primary-dark); }

/* ===== スクロールアニメーション（Fade Up） ===== */
.fade-up { opacity: 0; transform: translateY(24px); transition: opacity 0.8s cubic-bezier(0.16,1,0.3,1), transform 0.8s cubic-bezier(0.16,1,0.3,1); }
.fade-up.is-visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ==========================================================================
レスポンシブ対応
========================================================================== */
@media (max-width: 1200px) { .container { padding-inline: var(--space-3); } }

@media (max-width: 1024px) {
  .mission { grid-template-columns: 1fr; }
  .mission-slideshow { min-height: 360px; }
  .mission__body { padding-block: var(--space-5); }
  .business__item { grid-template-columns: 1fr; }
  .business__item--reverse { direction: ltr; }
}

@media (max-width: 768px) {
  .nav {
    position: fixed; top: var(--header-height); left: 0; width: 100%;
    height: calc(100vh - var(--header-height)); background: var(--color-bg);
    transform: translateX(100%); transition: transform var(--transition); overflow-y: auto;
  }
  .nav.is-open { transform: translateX(0); }
  .nav__list { flex-direction: column; align-items: flex-start; gap: var(--space-3); padding: var(--space-4); }
  .nav__link--cta { width: 100%; text-align: center; }
  .hamburger { display: flex; }

  .hero__title { font-size: clamp(1.9rem, 8vw, 2.6rem); }
  .hero__cta { flex-direction: column; align-items: stretch; }

  .about__grid { grid-template-columns: 1fr; }
  .business__item { margin-bottom: var(--space-5); }
  .diagram__branch { flex-direction: column; }
  .cta-unified__actions { flex-direction: column; align-items: stretch; }
  .footer__list { flex-direction: column; gap: var(--space-2); }
  .problems__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .section-title { font-size: 1.5rem; }
  .contact__form { padding: var(--space-3); }
  .problems__grid { grid-template-columns: 1fr; }
}