/* ═══════════════════════════════════════
   Mobiletent Corporate Site — Stylesheet
   ═══════════════════════════════════════ */

/* ─── DESIGN TOKENS ─── */
:root {
  --color-bg: #fafafa;
  --color-text: #111;
  --color-text-secondary: #555;
  --color-border: #ddd;
  --color-accent: #111;
  --font-en: 'Outfit', sans-serif;
  --font-ja: 'Noto Sans JP', sans-serif;
  --space-xs: 12px;
  --space-sm: 24px;
  --space-md: 48px;
  --space-lg: 80px;
  --space-xl: 140px;
  --space-2xl: 200px;
}

/* ─── RESET ─── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-ja);
  font-weight: 400;
  line-height: 1.9;
  letter-spacing: 0.02em;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ─── HEADER ─── */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding: 28px 48px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(250, 250, 250, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: padding 0.4s cubic-bezier(0.22, 1, 0.36, 1),
              background 0.4s,
              box-shadow 0.4s;
}

header.scrolled {
  padding: 16px 48px;
  background: rgba(250, 250, 250, 0.95);
  box-shadow: 0 1px 0 var(--color-border);
}

.logo {
  font-family: var(--font-en);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  transition: font-size 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

header.scrolled .logo {
  font-size: 13px;
}

nav {
  display: flex;
  gap: 40px;
  align-items: center;
}

nav a {
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  position: relative;
  transition: opacity 0.3s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.nav-ja {
  font-family: var(--font-ja);
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: none;
  color: var(--color-text-secondary);
  opacity: 0.7;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-text);
  transition: width 0.3s ease;
}

nav a:hover::after {
  width: 100%;
}

nav a:hover {
  opacity: 0.6;
}

/* ─── HERO ─── */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 0 48px var(--space-xl);
  position: relative;
  overflow: hidden;
}

#hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.12;
}

.hero-label {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
  opacity: 0;
  transform: translateY(16px);
  animation: fadeUp 0.8s 0.3s forwards;
}

.hero-title {
  font-family: var(--font-en);
  font-weight: 200;
  font-size: clamp(42px, 7vw, 96px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 900px;
  opacity: 0;
  transform: translateY(24px);
  animation: fadeUp 1s 0.5s forwards;
}

.hero-sub {
  margin-top: var(--space-md);
  font-size: 16px;
  font-weight: 400;
  color: var(--color-text-secondary);
  line-height: 2;
  max-width: 520px;
  opacity: 0;
  transform: translateY(16px);
  animation: fadeUp 0.8s 0.8s forwards;
}

.hero-cta {
  margin-top: var(--space-md);
  opacity: 0;
  transform: translateY(16px);
  animation: fadeUp 0.8s 1s forwards;
}

.hero-cta a {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 16px 48px;
  border: 1px solid var(--color-text);
  transition: background 0.3s, color 0.3s;
}

.hero-cta a:hover {
  background: var(--color-text);
  color: var(--color-bg);
}

.hero-scroll {
  position: absolute;
  right: 48px;
  bottom: var(--space-xl);
  writing-mode: vertical-rl;
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  opacity: 0;
  animation: fadeUp 0.8s 1.2s forwards;
}

.hero-scroll::before {
  content: '';
  display: block;
  width: 1px;
  height: 48px;
  background: var(--color-border);
  margin: 0 auto 16px;
  animation: scrollLine 2s ease-in-out infinite;
}

/* ─── SECTION COMMON ─── */
.section {
  padding: var(--space-2xl) 48px;
  position: relative;
}

.section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 48px;
  right: 48px;
  height: 1.5px;
  background: linear-gradient(90deg, var(--color-text) 0%, var(--color-border) 40%, transparent 100%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 1.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.section::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 48px;
  width: 30%;
  height: 0.5px;
  background: var(--color-border);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 2s cubic-bezier(0.16, 1, 0.3, 1) 0.2s;
}

.section.in-view::before {
  transform: scaleX(1);
}

.section.in-view::after {
  transform: scaleX(1);
}

.section-label {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
  display: inline-block;
}

.section-heading {
  font-family: var(--font-en);
  font-weight: 300;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-lg);
}

/* ─── SERVICES ─── */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  margin-top: var(--space-lg);
}

.service-item {
  padding: var(--space-lg) var(--space-md) var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border);
  position: relative;
  transition: background 0.4s;
  overflow: hidden;
}

.service-item:nth-child(odd) {
  padding-left: 0;
  padding-right: var(--space-md);
  border-right: 1px solid var(--color-border);
}

.service-item:nth-child(even) {
  padding-left: var(--space-md);
  padding-right: 0;
}

/* 奇数個のサービスの場合、最後のアイテムを全幅に */
.service-item:last-child:nth-child(odd) {
  grid-column: 1 / -1;
  border-right: none;
  max-width: 50%;
}

.service-illust {
  position: absolute;
  right: -10px;
  bottom: -10px;
  width: 180px;
  height: 180px;
  opacity: 0;
  transition: opacity 0.8s ease, transform 0.6s ease;
  pointer-events: none;
}

/* スクロールで表示されたら描画開始 */
.service-item.visible .service-illust {
  opacity: 0.15;
  transition: opacity 1.2s ease, transform 0.6s ease;
}

.service-item:nth-child(odd) .service-illust {
  right: 10px;
}

.service-item:nth-child(even) .service-illust {
  right: -10px;
  left: auto;
}

.service-item:hover .service-illust {
  opacity: 0.2;
  transform: scale(1.05);
  animation-play-state: paused;
}

.service-illust svg {
  width: 100%;
  height: 100%;
}

/* SVG ストロークドロー + フロートアニメーション */
.service-illust svg line,
.service-illust svg rect,
.service-illust svg circle,
.service-illust svg polyline,
.service-illust svg polygon,
.service-illust svg path {
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  transition: stroke-dashoffset 0s;
}

.service-item.visible .service-illust svg line,
.service-item.visible .service-illust svg rect,
.service-item.visible .service-illust svg circle,
.service-item.visible .service-illust svg polyline,
.service-item.visible .service-illust svg polygon,
.service-item.visible .service-illust svg path {
  animation: svgDraw 5s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

/* 各要素に描画タイミングのずらし */
.service-item.visible .service-illust svg :nth-child(1) { animation-delay: 0.2s; }
.service-item.visible .service-illust svg :nth-child(2) { animation-delay: 0.4s; }
.service-item.visible .service-illust svg :nth-child(3) { animation-delay: 0.6s; }
.service-item.visible .service-illust svg :nth-child(4) { animation-delay: 0.8s; }
.service-item.visible .service-illust svg :nth-child(5) { animation-delay: 1.0s; }
.service-item.visible .service-illust svg :nth-child(6) { animation-delay: 1.1s; }
.service-item.visible .service-illust svg :nth-child(7) { animation-delay: 1.2s; }
.service-item.visible .service-illust svg :nth-child(8) { animation-delay: 1.3s; }
.service-item.visible .service-illust svg :nth-child(9) { animation-delay: 1.4s; }
.service-item.visible .service-illust svg :nth-child(10) { animation-delay: 1.5s; }

/* 描画完了後のフロート（ゆらゆら浮遊）— 不透明度も通常に戻す */
.service-item.visible .service-illust {
  animation: illustFloat 5s ease-in-out 3s infinite;
}

/* サービスカードごとにフロートの位相をずらす */
.service-item:nth-child(2).visible .service-illust { animation-delay: 3.3s; }
.service-item:nth-child(3).visible .service-illust { animation-delay: 3.6s; }
.service-item:nth-child(4).visible .service-illust { animation-delay: 3.1s; }
.service-item:nth-child(5).visible .service-illust { animation-delay: 3.9s; }

@keyframes svgDraw {
  to {
    stroke-dashoffset: 0;
  }
}

@keyframes illustFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.service-num {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
  position: relative;
}

.service-title {
  font-family: var(--font-en);
  font-weight: 400;
  font-size: 22px;
  letter-spacing: 0.01em;
  margin-bottom: var(--space-sm);
  line-height: 1.3;
  position: relative;
}

.service-title-ja {
  font-size: 14px;
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.06em;
  position: relative;
}

.service-desc {
  font-size: 15px;
  font-weight: 400;
  color: var(--color-text-secondary);
  line-height: 2;
  max-width: 380px;
  position: relative;
}

.service-link {
  display: inline-block;
  margin-top: var(--space-sm);
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  position: relative;
  transition: color 0.3s;
}

.service-link:hover {
  color: var(--color-text);
}

/* ─── NEWS ─── */
.news-list {
  list-style: none;
  margin-top: var(--space-lg);
}

.news-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
  align-items: baseline;
  transition: opacity 0.3s;
}

.news-item:hover {
  opacity: 0.6;
}

.news-date {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
}

.news-title {
  font-size: 15px;
  font-weight: 400;
  line-height: 1.8;
}

/* ─── ABOUT ─── */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.about-text {
  font-size: 16px;
  line-height: 2.2;
  color: var(--color-text-secondary);
  font-weight: 400;
}

.about-text p+p {
  margin-top: var(--space-sm);
}

.about-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.about-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: var(--space-sm);
  font-size: 15px;
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.about-row dt {
  font-family: var(--font-en);
  font-weight: 400;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  padding-top: 2px;
}

.about-row dd {
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.8;
}

/* ─── CONTACT ─── */
.contact {
  text-align: center;
}

.contact-heading {
  font-family: var(--font-en);
  font-weight: 200;
  font-size: clamp(36px, 5vw, 72px);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.contact-desc {
  font-size: 16px;
  color: var(--color-text-secondary);
  font-weight: 400;
  margin-bottom: var(--space-lg);
  line-height: 2;
}

.contact-form {
  max-width: 600px;
  margin: 0 auto;
  text-align: left;
}

.form-group {
  margin-bottom: var(--space-md);
  position: relative;
}

.form-label {
  display: block;
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: 10px;
}

.form-label .required {
  color: var(--color-text);
  margin-left: 4px;
  font-size: 9px;
}

.form-label-ja {
  font-family: var(--font-ja);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: none;
  opacity: 0.6;
  margin-left: 6px;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 14px 0;
  font-family: var(--font-ja);
  font-size: 15px;
  font-weight: 400;
  color: var(--color-text);
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--color-border);
  outline: none;
  transition: border-color 0.3s;
  appearance: none;
  -webkit-appearance: none;
  border-radius: 0;
}

/* フォーカスラインアニメーション */
.form-group::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: var(--color-text);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.form-group:focus-within::after {
  transform: scaleX(1);
}

.form-input:focus,
.form-textarea:focus {
  border-bottom-color: var(--color-border);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: #bbb;
  font-weight: 300;
  transition: opacity 0.3s;
}

.form-input:focus::placeholder,
.form-textarea:focus::placeholder {
  opacity: 0.4;
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.9;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.form-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 18px 56px;
  border: 1px solid var(--color-text);
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: background 0.4s, color 0.4s, transform 0.2s;
  margin-top: var(--space-sm);
  position: relative;
}

.form-submit:hover {
  background: var(--color-text);
  color: var(--color-bg);
}

.form-submit:active {
  transform: scale(0.97);
}

.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  background: var(--color-text);
  color: var(--color-bg);
}

/* 送信ボタンスピナー */
.form-submit .spinner {
  display: none;
  width: 16px;
  height: 16px;
  border: 1.5px solid transparent;
  border-top-color: currentColor;
  border-right-color: currentColor;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.form-submit.sending .spinner {
  display: block;
}

.form-submit-wrap {
  text-align: center;
  margin-top: var(--space-md);
}

.form-success {
  display: none;
  text-align: center;
  padding: var(--space-lg) 0;
  opacity: 0;
  transform: translateY(12px);
}

.form-success.show {
  display: block;
  animation: fadeUp 0.6s 0.1s forwards;
}

/* アニメーション付きチェックマーク */
.form-success-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-md);
  position: relative;
}

.form-success-icon svg {
  width: 100%;
  height: 100%;
}

.form-success-icon .circle {
  fill: none;
  stroke: var(--color-text);
  stroke-width: 1.5;
  stroke-dasharray: 166;
  stroke-dashoffset: 166;
  animation: strokeDraw 0.6s cubic-bezier(0.65, 0, 0.45, 1) forwards;
}

.form-success-icon .check {
  fill: none;
  stroke: var(--color-text);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 48;
  stroke-dashoffset: 48;
  animation: strokeDraw 0.4s cubic-bezier(0.65, 0, 0.45, 1) 0.4s forwards;
}

.form-success-title {
  font-family: var(--font-en);
  font-weight: 300;
  font-size: 24px;
  margin-bottom: var(--space-xs);
}

.form-success-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  font-weight: 400;
}

/* バリデーションエラーシェイク */
.form-group.shake {
  animation: shake 0.4s ease;
}

.form-group.shake .form-input,
.form-group.shake .form-textarea {
  border-bottom-color: #c44;
}

/* ─── BACK TO TOP ─── */
.back-to-top {
  position: fixed;
  bottom: 90px;
  right: 36px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  background: rgba(250, 250, 250, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.4s, visibility 0.4s, transform 0.4s, background 0.3s, border-color 0.3s;
  z-index: 90;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
}

.back-to-top svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 1.5;
  fill: none;
}

/* ─── HIYOKO WIDGET ─── */
#hiyoko-widget {
  position: fixed;
  bottom: 0;
  right: 24px;
  width: 48px;
  cursor: pointer;
  z-index: 9999;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

#hiyoko-widget canvas {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  display: block;
  margin: 0 auto;
}

#hiyoko-bubble {
  position: absolute;
  bottom: 56px;
  right: 4px;
  background: #fff;
  border: 2px solid #f7c623;
  border-radius: 10px 10px 2px 10px;
  padding: 6px 10px;
  font-size: 11px;
  font-family: monospace;
  white-space: nowrap;
  color: #333;
  opacity: 0;
  transform: scale(0.8);
  transform-origin: bottom right;
  transition: opacity 0.15s, transform 0.15s;
  pointer-events: none;
}

#hiyoko-bubble.show {
  opacity: 1;
  transform: scale(1);
}

#hiyoko-bubble::after {
  content: '';
  position: absolute;
  bottom: -8px;
  right: 10px;
  border: 4px solid transparent;
  border-top-color: #f7c623;
}

/* ─── FOOTER ─── */
footer {
  padding: var(--space-md) 48px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--color-border);
}

.footer-logo {
  font-family: var(--font-en);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.footer-copy {
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
}

/* ─── ANIMATIONS ─── */
@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scrollLine {
  0%,
  100% {
    transform: scaleY(1);
    transform-origin: top;
  }
  50% {
    transform: scaleY(0.4);
    transform-origin: bottom;
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes strokeDraw {
  to {
    stroke-dashoffset: 0;
  }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── ACCESSIBILITY ─── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  #hero-canvas {
    display: none;
  }

  .service-illust svg line,
  .service-illust svg rect,
  .service-illust svg circle,
  .service-illust svg polyline,
  .service-illust svg polygon,
  .service-illust svg path {
    stroke-dashoffset: 0 !important;
    stroke-dasharray: none !important;
  }
}

/* ─── Hide hamburger on desktop ─── */
.nav-toggle {
  display: none;
}

/* ═══════════════════════════════════════
   RESPONSIVE: TABLET (≤ 900px)
   ═══════════════════════════════════════ */
@media (max-width: 900px) {
  header {
    padding: 20px 24px;
  }

  header.scrolled {
    padding: 14px 24px;
  }

  nav {
    gap: 24px;
  }

  .hero {
    padding: 0 24px var(--space-lg);
  }

  .hero-title {
    font-size: clamp(36px, 8vw, 64px);
  }

  .hero-scroll {
    display: none;
  }

  .section {
    padding: var(--space-xl) 24px;
  }

  .section::before {
    left: 24px;
    right: 24px;
  }

  .section::after {
    left: 24px;
  }

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

  .service-item,
  .service-item:nth-child(odd),
  .service-item:nth-child(even) {
    padding: var(--space-md) 0;
    border-right: none;
  }

  .service-item:last-child:nth-child(odd) {
    max-width: 100%;
  }

  .service-illust {
    width: 140px;
    height: 140px;
    right: -5px;
    bottom: -5px;
  }

  .service-item:nth-child(even) .service-illust {
    left: auto;
    right: -5px;
  }

  .about-content {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .news-item {
    grid-template-columns: 110px 1fr;
    gap: var(--space-sm);
  }

  .contact-heading {
    font-size: clamp(32px, 6vw, 56px);
  }

  footer {
    padding: var(--space-sm) 24px;
    flex-direction: column;
    gap: 12px;
  }
}

/* ═══════════════════════════════════════
   RESPONSIVE: MOBILE (≤ 600px)
   ═══════════════════════════════════════ */
@media (max-width: 600px) {
  :root {
    --space-xl: 100px;
    --space-2xl: 120px;
  }

  header {
    padding: 16px 20px;
  }

  header.scrolled {
    padding: 12px 20px;
  }

  .back-to-top {
    bottom: 76px;
    right: 20px;
    width: 40px;
    height: 40px;
  }

  #hiyoko-widget {
    right: 16px;
    width: 42px;
  }

  .logo {
    font-size: 13px;
  }

  /* ハンバーガーメニュー */
  .nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
    z-index: 200;
  }

  .nav-toggle span {
    display: block;
    width: 20px;
    height: 1px;
    background: var(--color-text);
    transition: transform 0.3s, opacity 0.3s;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -4px);
  }

  nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100vh;
    background: var(--color-bg);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 40px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
    z-index: 150;
  }

  nav.open {
    opacity: 1;
    pointer-events: all;
  }

  nav a {
    font-size: 16px;
    letter-spacing: 0.18em;
  }

  .hero {
    padding: 0 20px var(--space-lg);
    min-height: 90vh;
  }

  .hero-title {
    font-size: clamp(32px, 10vw, 52px);
  }

  .hero-sub {
    font-size: 14px;
    max-width: 100%;
  }

  .hero-label {
    font-size: 10px;
  }

  .section {
    padding: var(--space-xl) 20px;
  }

  .section::before {
    left: 20px;
    right: 20px;
  }

  .section::after {
    left: 20px;
  }

  .section-heading {
    font-size: clamp(24px, 6vw, 36px);
    margin-bottom: var(--space-md);
  }

  .section-label {
    font-size: 10px;
    margin-bottom: var(--space-sm);
  }

  .service-illust {
    width: 120px;
    height: 120px;
    right: -10px;
    bottom: -10px;
    opacity: 0.05;
  }

  .service-item:nth-child(even) .service-illust {
    left: auto;
    right: -10px;
  }

  .service-title {
    font-size: 19px;
  }

  .service-title-ja {
    font-size: 13px;
  }

  .service-desc {
    font-size: 14px;
    max-width: 100%;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 20px 0;
  }

  .news-date {
    font-size: 12px;
  }

  .news-title {
    font-size: 14px;
  }

  .about-content {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .about-text {
    font-size: 14px;
  }

  .about-row {
    grid-template-columns: 90px 1fr;
    font-size: 14px;
    gap: 12px;
  }

  .about-row dt {
    font-size: 11px;
  }

  .contact-heading {
    font-size: clamp(28px, 8vw, 48px);
  }

  .contact-desc {
    font-size: 14px;
  }

  .contact-desc br {
    display: none;
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .form-submit {
    width: 100%;
    padding: 16px 40px;
    font-size: 12px;
  }

  footer {
    padding: 20px;
  }

  .footer-logo {
    font-size: 12px;
  }
}