/* ============================================================
   RS機械設計 - メインスタイルシート
   ゼロベース版
   ============================================================ */

/* ---------- リセット・基本設定 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-primary:     #1d4ed8;
  --color-primary-dk:  #1e40af;
  --color-primary-lt:  #eff6ff;
  --color-accent:      #f59e0b;
  --color-dark:        #0f172a;
  --color-dark-card:   #1e293b;
  --color-text:        #1e293b;
  --color-text-sub:    #64748b;
  --color-bg:          #ffffff;
  --color-bg-light:    #f8fafc;
  --color-border:      #e2e8f0;

  --font-sans: 'Noto Sans JP', 'Hiragino Sans', 'Meiryo', sans-serif;
  --font-mono: 'Inter', monospace;

  --section-pad: 6rem;
  --container:   1160px;
  --radius:      10px;
  --radius-lg:   16px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,.12);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

/* ---------- ユーティリティ ---------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.section-pad { padding: var(--section-pad) 0; }
.bg-light { background: var(--color-bg-light); }
.bg-dark  { background: var(--color-dark); color: #fff; }

/* ---------- セクションヘッダー ---------- */
.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}
.section-header__en {
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--color-primary);
  margin-bottom: .5rem;
  display: block;
}
.section-header__ja {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 900;
  line-height: 1.4;
  margin-bottom: 1rem;
}
.section-header__desc {
  color: var(--color-text-sub);
  font-size: .95rem;
  line-height: 1.9;
}
.section-header--light .section-header__en  { color: #93c5fd; }
.section-header--light .section-header__ja  { color: #fff; }
.section-header--light .section-header__desc { color: #94a3b8; }

/* ---------- ボタン ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .75rem 1.75rem;
  border-radius: 6px;
  font-size: .95rem;
  font-weight: 700;
  line-height: 1;
  transition: all .2s ease;
}
.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(29,78,216,.3);
}
.btn--primary:hover {
  background: var(--color-primary-dk);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(29,78,216,.35);
}
.btn--outline {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}
.btn--outline:hover {
  background: var(--color-primary);
  color: #fff;
}
.btn--lg   { padding: 1rem 2.25rem; font-size: 1rem; }
.btn--full { width: 100%; }

/* ============================================================
   HEADER
   ============================================================ */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.header__logo {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-weight: 900;
}
.logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .05em;
}
.logo-text {
  font-size: 1rem;
  color: var(--color-text);
  font-weight: 700;
}
.nav__list {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav__list a {
  font-size: .85rem;
  font-weight: 500;
  color: var(--color-text-sub);
  transition: color .2s;
}
.nav__list a:hover { color: var(--color-primary); }
.nav__cta {
  background: var(--color-primary) !important;
  color: #fff !important;
  padding: .5rem 1.25rem;
  border-radius: 6px;
  font-size: .85rem !important;
  font-weight: 700 !important;
}
.nav__cta:hover { background: var(--color-primary-dk) !important; }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
}
.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all .3s;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 68px;
  overflow: hidden;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 60%, #1d4ed8 100%);
}
.hero__bg { position: absolute; inset: 0; pointer-events: none; }
.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 48px 48px;
}
.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: center;
  padding-top: 3rem;
  padding-bottom: 5rem;
}
.hero__eyebrow {
  font-size: .8rem;
  font-weight: 500;
  letter-spacing: .1em;
  color: #93c5fd;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: .75rem;
}
.hero__eyebrow::before {
  content: '';
  display: block;
  width: 28px; height: 2px;
  background: #93c5fd;
  border-radius: 2px;
}
.hero__title {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 900;
  line-height: 1.35;
  color: #fff;
  margin-bottom: 1.5rem;
}
.hero__title em { font-style: normal; color: #fbbf24; }
.hero__sub {
  font-size: clamp(.9rem, 1.5vw, 1.05rem);
  color: #cbd5e1;
  line-height: 2;
  margin-bottom: 1.75rem;
}
.hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 2.25rem;
}
.tag {
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  color: #e2e8f0;
  font-size: .78rem;
  font-weight: 500;
  padding: .35rem .85rem;
  border-radius: 20px;
  letter-spacing: .03em;
}
.hero__cta { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero__stats {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.stat-card {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: var(--radius);
  padding: 1.25rem 1.75rem;
  text-align: center;
  backdrop-filter: blur(4px);
  min-width: 160px;
}
.stat-card__num {
  display: block;
  font-size: 2.25rem;
  font-weight: 900;
  color: #fff;
  line-height: 1;
  margin-bottom: .4rem;
  font-family: var(--font-mono);
}
.stat-card__num small { font-size: 1rem; font-weight: 500; color: #93c5fd; }
/* テキスト系ボックス（「一貫設計」「現場重視」など）の文字サイズ調整 */
.stat-card__num--sm { font-size: 1.35rem; letter-spacing: .02em; }
.stat-card__label { display: block; font-size: .75rem; color: #94a3b8; font-weight: 500; }
.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
  z-index: 1;
}
.hero__scroll span { font-size: .65rem; letter-spacing: .2em; color: #64748b; }
.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, #475569, transparent);
  animation: scrollLine 1.8s ease-in-out infinite;
}
@keyframes scrollLine {
  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; }
}

/* ============================================================
   CASES
   ============================================================ */
.cases__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}
.case-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: all .2s;
}
.case-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.case-card__icon { width: 40px; height: 40px; margin-bottom: 1rem; }
.case-card__label {
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--color-primary);
  margin-bottom: .4rem;
  font-family: var(--font-mono);
}
.case-card__text { font-size: .9rem; line-height: 1.7; }
.case-card__text strong { color: var(--color-primary); }
.cases__cta { text-align: center; }

/* ============================================================
   ABOUT
   ============================================================ */
.about__inner {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 4rem;
  align-items: start;
}
.about__photo-wrap {
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 3/4;
  background: var(--color-primary-lt);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}
.about__photo-placeholder { text-align: center; padding: 2rem; }
.about__photo-placeholder svg { width: 100px; margin: 0 auto 1rem; }
.about__photo-note { font-size: .75rem; color: var(--color-text-sub); }

/* プロフィール実画像 */
.about__photo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  border-radius: var(--radius-lg);
  display: block;
}
.about__profile-card {
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.about__name    { font-size: .8rem; color: var(--color-text-sub); }
.about__name-ja { font-size: 1.1rem; margin-bottom: 1rem; }
.about__spec    { display: flex; flex-direction: column; gap: .6rem; }
.about__spec li {
  display: flex;
  gap: .75rem;
  font-size: .82rem;
  line-height: 1.6;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: .6rem;
}
.about__spec li:last-child { border-bottom: none; padding-bottom: 0; }
.about__spec span { color: var(--color-text-sub); min-width: 60px; }
.about__lead {
  font-size: clamp(1.2rem, 2vw, 1.45rem);
  font-weight: 700;
  line-height: 1.7;
  margin-bottom: 1.75rem;
}
.about__lead em {
  font-style: normal;
  color: var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
}
.about__text p {
  color: var(--color-text-sub);
  font-size: .95rem;
  line-height: 2;
  margin-bottom: 1.25rem;
}
.about__text p strong { color: var(--color-text); }

/* ============================================================
   STRENGTH
   ============================================================ */
.strength__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
}
.strength-item {
  background: var(--color-dark-card);
  border: 1px solid rgba(255,255,255,.07);
  padding: 2.5rem;
  transition: background .2s;
}
.strength-item:hover { background: #243656; }
.strength-item:first-child  { border-radius: var(--radius-lg) 0 0 0; }
.strength-item:nth-child(2) { border-radius: 0 var(--radius-lg) 0 0; }
.strength-item:nth-child(3) { border-radius: 0 0 0 var(--radius-lg); }
.strength-item:last-child   { border-radius: 0 0 var(--radius-lg) 0; }
.strength-item__num {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 900;
  color: rgba(29,78,216,.35);
  line-height: 1;
  margin-bottom: 1rem;
  letter-spacing: -.02em;
}
.strength-item h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.6;
  margin-bottom: 1rem;
}
.strength-item__body p {
  font-size: .88rem;
  line-height: 1.9;
  color: #94a3b8;
  margin-bottom: 1.25rem;
}
.strength-item__list { display: flex; flex-direction: column; gap: .5rem; }
.strength-item__list li {
  font-size: .82rem;
  color: #cbd5e1;
  padding-left: 1.25rem;
  position: relative;
}
.strength-item__list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #60a5fa;
  font-size: .75rem;
  top: .1em;
}
.strength-item__fields { display: flex; flex-direction: column; gap: .75rem; }
.field-tag {
  background: rgba(29,78,216,.2);
  border: 1px solid rgba(29,78,216,.4);
  border-radius: 8px;
  padding: .75rem 1rem;
}
.field-tag strong { display: block; font-size: .82rem; color: #93c5fd; margin-bottom: .3rem; }
.field-tag span   { font-size: .78rem; color: #64748b; }
.strength-item__compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .75rem;
}
.compare-col { border-radius: 8px; padding: .75rem 1rem; }
.compare-col--other {
  background: rgba(100,116,139,.15);
  border: 1px solid rgba(100,116,139,.3);
}
.compare-col--rs {
  background: rgba(29,78,216,.2);
  border: 1px solid rgba(29,78,216,.4);
}
.compare-col__head { font-size: .78rem; font-weight: 700; margin-bottom: .6rem; }
.compare-col--other .compare-col__head { color: #94a3b8; }
.compare-col--rs    .compare-col__head { color: #93c5fd; }
.compare-col li {
  font-size: .75rem;
  color: #64748b;
  padding-left: 1rem;
  position: relative;
  line-height: 1.7;
}
.compare-col--rs li { color: #94a3b8; }
.compare-col li::before { content: '·'; position: absolute; left: 0; }

/* ============================================================
   SERVICES
   ============================================================ */
.services__tabs {
  display: flex;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 2.5rem;
}
.tab-btn {
  padding: .85rem 1.75rem;
  font-size: .9rem;
  font-weight: 600;
  color: var(--color-text-sub);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all .2s;
}
.tab-btn:hover { color: var(--color-primary); }
.tab-btn--active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}
.tab-content { display: none; }
.tab-content--active { display: block; }
.service-detail {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 2.5rem;
  align-items: start;
}
.service-detail h3 { font-size: 1.35rem; font-weight: 700; margin-bottom: .75rem; }
.service-detail__lead {
  color: var(--color-text-sub);
  font-size: .95rem;
  line-height: 1.9;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
}
.service-detail__items {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.service-item {
  padding: 1.25rem;
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  border-left: 3px solid var(--color-primary);
}
.service-item h4 { font-size: .9rem; font-weight: 700; margin-bottom: .5rem; }
.service-item p { font-size: .82rem; line-height: 1.8; color: var(--color-text-sub); }
.service-scope {
  background: var(--color-primary-lt);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius);
  padding: 1.5rem;
  position: sticky;
  top: 90px;
}
.service-scope h4 {
  font-size: .85rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1rem;
}
.service-scope ul { display: flex; flex-direction: column; gap: .6rem; }
.service-scope li {
  font-size: .82rem;
  display: flex;
  align-items: flex-start;
  gap: .5rem;
}
.check { color: var(--color-primary); font-weight: 700; flex-shrink: 0; }
/* ============================================================
   工程フロー（専用機タブ内）
   ============================================================ */
.process-flow {
  display: flex;
  align-items: stretch;
  gap: 0;
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: .5rem;
}
.process-step {
  flex: 1;
  padding: 1rem .75rem;
  text-align: center;
  border-right: 1px solid var(--color-border);
}
.process-step:last-child { border-right: none; }
.process-step__num {
  display: inline-block;
  font-size: .65rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--color-primary);
  letter-spacing: .08em;
  margin-bottom: .35rem;
}
.process-step__name {
  font-size: .82rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: .25rem;
  line-height: 1.4;
}
.process-step__detail {
  font-size: .72rem;
  color: var(--color-text-sub);
  line-height: 1.5;
}
.process-arrow {
  display: flex;
  align-items: center;
  padding: 0 .25rem;
  font-size: .9rem;
  color: var(--color-primary);
  flex-shrink: 0;
  background: var(--color-primary-lt);
}

@media (max-width: 768px) {
  .process-flow {
    flex-direction: column;
    gap: 0;
  }
  .process-step {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    text-align: left;
    display: grid;
    grid-template-columns: auto 1fr 1fr;
    align-items: center;
    gap: .5rem 1rem;
    padding: .75rem 1rem;
  }
  .process-step:last-child { border-bottom: none; }
  .process-step__num  { grid-row: 1; grid-column: 1; margin-bottom: 0; }
  .process-step__name { grid-row: 1; grid-column: 2; margin-bottom: 0; }
  .process-step__detail { grid-row: 1; grid-column: 3; }
  .process-arrow { display: none; }
}

/* ============================================================ */
.services__cta {
  margin-top: 3rem;
  padding: 2rem;
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.services__cta p { font-size: .95rem; color: var(--color-text-sub); }

/* ============================================================
   PORTFOLIO
   ============================================================ */
.portfolio__placeholder { max-width: 560px; margin: 0 auto; }
.portfolio-coming {
  text-align: center;
  padding: 4rem 2rem;
  background: #fff;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
}
.portfolio-coming__icon { width: 80px; margin: 0 auto 1.5rem; }
.portfolio-coming__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
}
.portfolio-coming__text {
  font-size: .88rem;
  color: var(--color-text-sub);
  line-height: 2;
  margin-bottom: 1.75rem;
}

/* ============================================================
   PRICE
   ============================================================ */
.price__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}
.price__lead {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.7;
  margin-bottom: 1.25rem;
}
.price__text p { font-size: .9rem; color: var(--color-text-sub); line-height: 2; margin-bottom: 1rem; }
.price__guide h4 {
  font-size: .85rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1rem;
  letter-spacing: .05em;
}
.price-table {
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 1.25rem;
}
.price-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .9rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  gap: 1rem;
}
.price-row:last-child { border-bottom: none; }
.price-row__label { font-size: .85rem; color: var(--color-text-sub); }
.price-row__value { font-size: .9rem; font-weight: 700; }

/* 大項目（時間単価）の強調 */
.price-row--head {
  background: var(--color-primary-lt);
}
.price-row--head .price-row__label {
  color: var(--color-primary);
  font-weight: 700;
}
.price-row--head .price-row__value {
  color: var(--color-primary);
  font-size: .95rem;
}

/* 月次契約の強調 */
.price-row--highlight {
  background: #fefce8;
  border-left: 3px solid var(--color-accent);
}
.price-row--highlight .price-row__label {
  color: #92400e;
  font-weight: 700;
}
.price-row--highlight .price-row__value {
  color: #92400e;
  font-size: .95rem;
}

/* 料金セクションの吹き出し風テキスト */
.price__voices {
  margin: 1.25rem 0;
  display: flex;
  flex-direction: column;
  gap: .5rem;
}
.price__voice {
  display: inline-block;
  background: var(--color-primary-lt);
  border-left: 3px solid var(--color-primary);
  padding: .5rem .9rem;
  font-size: .88rem;
  color: var(--color-primary);
  font-weight: 600;
  border-radius: 0 6px 6px 0;
  width: fit-content;
}

.price__note { font-size: .78rem; color: var(--color-text-sub); line-height: 2; }

/* ============================================================
   FLOW
   ============================================================ */
.flow__steps {
  display: flex;
  align-items: flex-start;
  overflow-x: auto;
  padding-bottom: 1rem;
}
.flow-step {
  flex: 1;
  min-width: 0;
  text-align: center;
  padding: 1.5rem 1rem;
}
.flow-step__num {
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--color-primary);
  font-family: var(--font-mono);
  margin-bottom: .75rem;
}
.flow-step__icon { width: 48px; margin: 0 auto .75rem; }
.flow-step h4 { font-size: .9rem; font-weight: 700; margin-bottom: .5rem; }
.flow-step p  { font-size: .78rem; color: var(--color-text-sub); line-height: 1.8; }
.flow-step p strong { color: var(--color-text); }
.flow__arrow {
  font-size: 1.2rem;
  color: #cbd5e1;
  flex-shrink: 0;
  align-self: center;
  padding-top: .5rem;
}
.flow__note {
  margin-top: 2rem;
  text-align: center;
  font-size: .85rem;
  color: var(--color-text-sub);
  background: var(--color-primary-lt);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius);
  padding: .85rem 1.25rem;
}

/* ============================================================
   FAQ
   ============================================================ */
.faq__list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: .75rem;
}
.faq-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow .2s;
}
.faq-item[open] { box-shadow: var(--shadow-md); border-color: #bfdbfe; }
.faq-item__q {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  font-size: .95rem;
  font-weight: 600;
  list-style: none;
  transition: background .2s;
}
.faq-item__q::-webkit-details-marker { display: none; }
.faq-item__q:hover { background: var(--color-primary-lt); }
.faq-item__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 6px;
  font-size: .78rem;
  font-weight: 900;
  flex-shrink: 0;
  font-family: var(--font-mono);
}
.faq-item__icon--a { background: #e2e8f0; color: var(--color-text); }
.faq-item__a {
  display: flex;
  gap: 1rem;
  padding: 1rem 1.5rem 1.5rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-light);
}
.faq-item__a p { font-size: .9rem; line-height: 1.9; color: var(--color-text-sub); }

/* ============================================================
   CONTACT
   ============================================================ */
.contact__desc { color: #94a3b8 !important; }
.contact__inner { max-width: 760px; margin: 0 auto; }
.contact-form {
  background: var(--color-dark-card);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}
.form-row { margin-bottom: 1.25rem; }
.form-row--2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}
.form-group { display: flex; flex-direction: column; gap: .5rem; }
.form-label { font-size: .82rem; font-weight: 600; color: #e2e8f0; }
.required {
  display: inline-block;
  font-size: .7rem;
  background: #dc2626;
  color: #fff;
  padding: .1rem .4rem;
  border-radius: 3px;
  margin-left: .4rem;
  vertical-align: middle;
}
.form-input, .form-textarea {
  width: 100%;
  padding: .7rem 1rem;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 6px;
  color: #f1f5f9;
  font-size: .9rem;
  font-family: inherit;
  transition: border-color .2s;
  -webkit-appearance: none;
}
.form-input::placeholder, .form-textarea::placeholder { color: #475569; }
.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: #60a5fa;
  background: rgba(255,255,255,.08);
}
.form-textarea { resize: vertical; }
.form-checkboxes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .6rem;
}
.form-checkbox, .form-radio {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .85rem;
  color: #cbd5e1;
  cursor: pointer;
}
.form-checkbox input, .form-radio input { accent-color: var(--color-primary); }
.form-radios { display: flex; gap: 1.25rem; padding-top: .4rem; }
.form-checkbox--policy { font-size: .82rem; color: #94a3b8; }
.form-checkbox--policy a { color: #60a5fa; text-decoration: underline; }
.form-submit { margin-top: 1.75rem; text-align: center; }
.form-submit .btn { max-width: 360px; }
.form-submit__note { margin-top: .75rem; font-size: .78rem; color: #64748b; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: #020617;
  color: #fff;
  padding: 3.5rem 0 1.5rem;
}
.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 3rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid rgba(255,255,255,.08);
  margin-bottom: 1.5rem;
}
.footer__logo { display: flex; align-items: center; gap: .6rem; margin-bottom: .75rem; }
.footer__tagline { font-size: .82rem; color: #475569; line-height: 1.8; }
.footer__nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem 1.5rem;
  justify-content: flex-end;
}
.footer__nav a { font-size: .82rem; color: #64748b; transition: color .2s; }
.footer__nav a:hover { color: #93c5fd; }
.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.footer__copy { font-size: .75rem; color: #334155; }
.footer__privacy { font-size: .75rem; color: #475569; text-decoration: underline; }

/* ============================================================
   FIXED CTA
   ============================================================ */
.fixed-cta {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 999;
  opacity: 0;
  transform: translateY(10px);
  transition: all .3s ease;
  pointer-events: none;
}
.fixed-cta.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* ============================================================
   レスポンシブ
   ============================================================ */
@media (max-width: 1024px) {
  .about__inner { grid-template-columns: 280px 1fr; gap: 2.5rem; }
  .strength__grid { grid-template-columns: 1fr; }
  .strength-item:first-child  { border-radius: var(--radius-lg) var(--radius-lg) 0 0; }
  .strength-item:nth-child(2) { border-radius: 0; }
  .strength-item:nth-child(3) { border-radius: 0; }
  .strength-item:last-child   { border-radius: 0 0 var(--radius-lg) var(--radius-lg); }
  .price__inner { grid-template-columns: 1fr; gap: 2.5rem; }
}

@media (max-width: 768px) {
  :root { --section-pad: 4rem; }

  .header__nav {
    display: none;
    position: fixed;
    top: 68px; left: 0; right: 0; bottom: 0;
    background: rgba(15,23,42,.97);
    padding: 2.5rem 2rem;
    flex-direction: column;
    align-items: flex-start;
  }
  .header__nav.open { display: flex; }
  .nav__list {
    flex-direction: column;
    align-items: flex-start;
    gap: .5rem;
    width: 100%;
  }
  .nav__list a { color: #e2e8f0; font-size: 1.1rem; padding: .5rem 0; }
  .nav__cta {
    margin-top: 1.5rem;
    padding: .85rem 1.75rem !important;
    font-size: 1rem !important;
    width: 100%;
    text-align: center;
  }
  .hamburger { display: flex; }

  .hero__inner { grid-template-columns: 1fr; padding-top: 2rem; padding-bottom: 4rem; }
  .hero__stats { flex-direction: row; flex-wrap: wrap; gap: .75rem; }
  .stat-card   { flex: 1; min-width: 140px; }
  .hero__cta   { flex-direction: column; }
  .hero__cta .btn { width: 100%; }

  .cases__grid { grid-template-columns: 1fr 1fr; }

  .about__inner { grid-template-columns: 1fr; }
  .about__photo-wrap { aspect-ratio: 4/3; max-width: 280px; margin: 0 auto 1.25rem; }

  .services__tabs { overflow-x: auto; }
  .tab-btn { padding: .85rem 1.25rem; white-space: nowrap; font-size: .82rem; }
  .service-detail { grid-template-columns: 1fr; }
  .service-detail__items { grid-template-columns: 1fr; }
  .service-scope { position: static; }
  .services__cta { flex-direction: column; text-align: center; }

  .flow__steps { flex-direction: column; gap: 1rem; }
  .flow__arrow { display: none; }
  .flow-step {
    text-align: left;
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 0 1rem;
    align-items: start;
    padding: 1.25rem;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
  }
  .flow-step__num  { grid-column: 2; grid-row: 1; text-align: left; }
  .flow-step__icon { grid-column: 1; grid-row: 1 / 3; margin: 0; }
  .flow-step h4    { grid-column: 2; grid-row: 2; }
  .flow-step p     { grid-column: 1 / -1; grid-row: 3; padding-top: .5rem; }

  .faq-item__q { padding: 1rem 1.25rem; font-size: .9rem; }
  .faq-item__a { padding: .9rem 1.25rem 1.25rem; }

  .form-row--2col  { grid-template-columns: 1fr; }
  .form-checkboxes { grid-template-columns: 1fr; }
  .contact-form    { padding: 1.75rem 1.25rem; }

  .footer__inner  { flex-direction: column; gap: 2rem; }
  .footer__nav ul { justify-content: flex-start; }
  .footer__bottom { flex-direction: column; gap: .5rem; text-align: center; }
}

@media (max-width: 480px) {
  .cases__grid { grid-template-columns: 1fr; }
  .hero__stats { flex-direction: column; }
  .stat-card   { min-width: 100%; }
}