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

:root {
  --blue:       #0176D3;
  --blue-dark:  #014F90;
  --blue-light: #E8F4FF;
  --navy:       #032D60;
  --text:       #1A1A1A;
  --text-sub:   #4A4A4A;
  --border:     #E0E0E0;
  --white:      #FFFFFF;
  --bg:         #F8F9FB;
  --radius:     12px;
  --shadow:     0 4px 24px rgba(0,0,0,0.08);
  --transition: 0.25s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans JP', sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--white);
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn--primary {
  background: var(--blue);
  color: var(--white);
  border-color: var(--blue);
}
.btn--primary:hover { background: var(--blue-dark); border-color: var(--blue-dark); }
.btn--outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.7);
}
.btn--outline:hover { background: rgba(255,255,255,0.15); }
.btn--nav {
  background: var(--blue);
  color: var(--white);
  padding: 10px 22px;
  font-size: 14px;
  border-radius: 6px;
}
.btn--nav:hover { background: var(--blue-dark); }
.btn--lg { padding: 18px 48px; font-size: 16px; }

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.header.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.1); }
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.header__logo .logo-text {
  font-size: 26px;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: -0.5px;
}
.header__nav ul {
  display: flex;
  align-items: center;
  gap: 36px;
}
.header__nav ul li a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  transition: color var(--transition);
}
.header__nav ul li a.btn--nav { color: var(--white); }
.header__nav ul li a:not(.btn):hover { color: var(--blue); }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 68px;
}
.hero__bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--navy) 0%, #0B4F9E 50%, #0176D3 100%);
}
.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero__content {
  position: relative;
  z-index: 1;
  color: var(--white);
  padding: 80px 24px;
  text-align: center;
  width: 100%;
}
.hero__label {
  display: inline-block;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  color: var(--white);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 28px;
}
.hero__title {
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 28px;
}
.hero__sub {
  font-size: 17px;
  line-height: 1.8;
  opacity: 0.88;
  margin-bottom: 48px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  text-align: left;
}
.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}
.hero__scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: rgba(255,255,255,0.6);
  font-size: 11px;
  letter-spacing: 2px;
  z-index: 1;
}
.hero__scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.6), transparent);
  animation: scrollDown 1.8s ease-in-out infinite;
}
@keyframes scrollDown {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ===== Stats ===== */
.stats {
  background: var(--white);
  padding: 0;
  box-shadow: var(--shadow);
}
.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 2px solid var(--blue);
}
.stat {
  padding: 40px 24px;
  text-align: center;
  border-right: 1px solid var(--border);
}
.stat:last-child { border-right: none; }
.stat__number {
  font-size: 48px;
  font-weight: 700;
  color: var(--blue);
  line-height: 1;
  margin-bottom: 8px;
}
.stat__number span { font-size: 28px; }
.stat__label {
  font-size: 13px;
  color: var(--text-sub);
  font-weight: 500;
}

/* ===== Section Common ===== */
.section { padding: 100px 0; }
.section__header {
  text-align: center;
  margin-bottom: 64px;
}
.section__label {
  display: inline-block;
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 3px;
  margin-bottom: 12px;
}
.section__title {
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 20px;
  line-height: 1.3;
}
.section__desc {
  font-size: 16px;
  color: var(--text-sub);
  line-height: 1.8;
}

/* ===== Services ===== */
.services { background: var(--white); }
.services__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.service-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 40px 36px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  border-top: 3px solid var(--blue);
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.12);
}
.service-card__icon {
  width: 52px;
  height: 52px;
  margin-bottom: 24px;
}
.service-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 14px;
}
.service-card p {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.8;
}

/* ===== Cases ===== */
.cases { background: var(--white); }
.cases__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.case-card {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 36px 28px;
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}
.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.case-card__tag {
  display: inline-block;
  background: var(--blue-light);
  color: var(--blue);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 20px;
}
.case-card__title {
  font-size: 18px;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.5;
  margin-bottom: 16px;
}
.case-card__body {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.8;
  margin-bottom: 28px;
}
.case-card__result {
  display: flex;
  gap: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.result-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.result-num {
  font-size: 24px;
  font-weight: 700;
  color: var(--blue);
  line-height: 1;
}
.result-label {
  font-size: 11px;
  color: var(--text-sub);
}

/* ===== Why ===== */
.why { background: var(--navy); }
.why .section__label { color: rgba(255,255,255,0.6); }
.why .section__title { color: var(--white); }
.why__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}
.why-item { color: var(--white); }
.why-item__num {
  font-size: 52px;
  font-weight: 700;
  color: rgba(255,255,255,0.12);
  line-height: 1;
  margin-bottom: 20px;
  font-family: Arial, sans-serif;
}
.why-item h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--white);
}
.why-item p {
  font-size: 15px;
  color: rgba(255,255,255,0.75);
  line-height: 1.8;
}

/* ===== Brand Story ===== */
.brand { background: var(--bg); }
.brand .section__title { line-height: 1.4; }
.brand__promise-inner {
  margin-top: 80px;
}
.brand__promise-header-light {
  text-align: center;
  margin-bottom: 48px;
}
.brand__promise-title-light {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  color: var(--navy);
  margin-top: 10px;
  line-height: 1.3;
}
.brand__promise-grid .promise-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-top: 3px solid var(--blue);
}
.brand__promise-grid .promise-card__num {
  color: rgba(1, 118, 211, 0.12);
}
.brand__promise-grid .promise-card h3 {
  color: var(--navy);
}
.brand__promise-grid .promise-card p {
  color: var(--text-sub);
}
.brand__promise-grid .promise-card:hover {
  background: var(--white);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.10);
}
.brand__inner {
  max-width: 720px;
  margin: 0 auto;
}
.brand__text-block {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.brand__text-block p {
  font-size: 16px;
  color: var(--text-sub);
  line-height: 1.9;
}
.brand__text-block em {
  font-style: normal;
  color: var(--blue);
  font-weight: 700;
}
.brand__quote {
  background: var(--navy);
  border-radius: var(--radius);
  padding: 40px 36px;
  border-left: 4px solid var(--blue);
}
.brand__quote p {
  font-size: 15px;
  color: rgba(255,255,255,0.85);
  line-height: 2;
  margin-bottom: 20px;
  font-style: italic;
}
.brand__quote cite {
  font-size: 13px;
  color: rgba(255,255,255,0.45);
  font-style: normal;
}
@media (max-width: 768px) {
  .brand__inner { grid-template-columns: 1fr; gap: 36px; }
}

/* ===== Promise ===== */
.promise { background: var(--navy); }
.promise .section__label { color: rgba(255,255,255,0.5); }
.promise .section__title { color: var(--white); }
.promise .section__desc { color: rgba(255,255,255,0.65); }
.promise__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.promise-card {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: background var(--transition), transform var(--transition);
}
.promise-card:nth-child(4),
.promise-card:nth-child(5) {
  grid-column: span 1;
}
.promise__grid .promise-card:nth-child(4) { grid-column: 1 / 2; }
.promise__grid .promise-card:nth-child(5) { grid-column: 2 / 3; }
@media (min-width: 901px) {
  .promise__grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .promise__grid .promise-card:nth-child(4) {
    grid-column: 1 / 2;
    margin-left: calc(50% + 12px);
    grid-column: 2 / 3;
  }
}
.promise-card:hover {
  background: rgba(255,255,255,0.12);
  transform: translateY(-4px);
}
.promise-card__num {
  font-size: 40px;
  font-weight: 700;
  color: rgba(255,255,255,0.1);
  line-height: 1;
  margin-bottom: 16px;
  font-family: Arial, sans-serif;
}
.promise-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
  line-height: 1.5;
}
.promise-card p {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  line-height: 1.85;
}

/* ===== About ===== */
.about { background: var(--bg); }
.about__inner { max-width: 720px; margin: 0 auto; }
.about__table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
.about__table tr { border-bottom: 1px solid var(--border); }
.about__table th {
  width: 140px;
  padding: 20px 0;
  text-align: left;
  color: var(--text-sub);
  font-weight: 500;
  vertical-align: top;
}
.about__table td {
  padding: 20px 0 20px 24px;
  color: var(--text);
}
.cert-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.cert-list li::before {
  content: '✓ ';
  color: var(--blue);
  font-weight: 700;
}

/* ===== Contact ===== */
.contact { background: var(--white); }
.contact__iframe-wrap {
  max-width: 760px;
  margin: 0 auto;
  overflow: hidden;
}
.contact__iframe-wrap iframe {
  width: 100%;
  border: none;
  display: block;
}
.contact__form {
  max-width: 760px;
  margin: 0 auto;
  background: var(--bg);
  border-radius: var(--radius);
  padding: 48px 56px;
  border: 1px solid var(--border);
}
.form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}
.form__group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}
.form__row .form__group { margin-bottom: 0; }
.form__group label {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.required {
  display: inline-block;
  background: var(--blue);
  color: var(--white);
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 3px;
  font-weight: 700;
}
.form__group input,
.form__group textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 15px;
  font-family: inherit;
  color: var(--text);
  background: var(--white);
  transition: border-color var(--transition);
  outline: none;
}
.form__group input:focus,
.form__group textarea:focus { border-color: var(--blue); }
.form__group textarea { resize: vertical; min-height: 140px; }
.form__submit { text-align: center; margin-top: 8px; }

/* ===== Footer ===== */
.footer {
  background: var(--navy);
  color: rgba(255,255,255,0.8);
}
.footer__inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding-top: 56px;
  padding-bottom: 56px;
  gap: 40px;
}
.footer__logo .logo-text {
  font-size: 28px;
  font-weight: 700;
  color: var(--white);
  display: block;
  margin-bottom: 10px;
}
.footer__logo p {
  font-size: 14px;
  color: rgba(255,255,255,0.55);
}
.footer__nav ul {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}
.footer__nav ul li a {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  transition: color var(--transition);
}
.footer__nav ul li a:hover { color: var(--white); }
.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .stats__grid { grid-template-columns: repeat(2, 1fr); }
  .stat { border-bottom: 1px solid var(--border); }
  .services__grid { grid-template-columns: 1fr; }
  .cases__grid { grid-template-columns: 1fr; }
  .why__grid { grid-template-columns: 1fr; gap: 32px; }
  .contact__form { padding: 36px 28px; }
  .form__row { grid-template-columns: 1fr; }
  .promise__grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .header__nav { display: none; }
  .header__nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: var(--white);
    padding: 24px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .header__nav.open ul { flex-direction: column; gap: 0; }
  .header__nav.open ul li { border-bottom: 1px solid var(--border); }
  .header__nav.open ul li a { display: block; padding: 16px 0; }
  .hamburger { display: flex; }
  .hero__actions { flex-direction: column; }
  .footer__inner { flex-direction: column; }
  .footer__nav ul { gap: 20px; }
  .section { padding: 72px 0; }
}
@media (max-width: 480px) {
  .stats__grid { grid-template-columns: repeat(2, 1fr); }
  .stat__number { font-size: 36px; }
}