:root {
  --color-bg: #ffffff;
  --color-bg-alt: #fafafa;
  --color-text: #1a1a1a;
  --color-text-mid: #222;
  --color-text-body: #333;
  --color-text-muted: #666;
  --color-text-light: #777;
  --color-text-lighter: #888;
  --color-border: #ddd;
  --color-border-light: #e0e0e0;
  --color-footer-bg: #2b2b2b;
  --color-footer-text: #ddd;
  --color-footer-muted: #aaa;
  --font-sans: system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  --max-width: 1200px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text-body);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

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

button {
  font-family: inherit;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section-heading {
  text-align: center;
  margin: 0 0 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.section-heading h2 {
  margin: 0;
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text);
}

.section-heading p {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-light);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 14px 24px;
  border-radius: 2px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--color-text-body);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-text-body);
  color: #fff;
  border-color: var(--color-text-body);
}

.btn-outline {
  background: #fff;
  color: var(--color-text-body);
}

/* logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo svg {
  flex-shrink: 0;
}

.logo span {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-text);
  white-space: nowrap;
}

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  border-bottom: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  font-size: 13px;
  color: #555;
  white-space: nowrap;
}

.site-nav a:hover {
  color: var(--color-text);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-tel {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-body);
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
}

.nav-toggle svg {
  display: block;
}

/* hero */
.hero {
  position: relative;
  min-height: 760px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  overflow: hidden;
}

.hero img.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1.2s ease;
}

.hero img.hero-bg.active {
  opacity: 1;
}

.hero-panel {
  position: relative;
  z-index: 1;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid #ccc;
  padding: 40px 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
  max-width: 720px;
}

.hero-eyebrow {
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--color-text-light);
}

.hero-headline {
  width: 100%;
  max-width: 560px;
  height: auto;
}

.hero-sub {
  font-size: 14px;
  color: var(--color-text-muted);
}

.hero-ctas {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.hero-ctas .btn-outline {
  flex-direction: column;
  gap: 2px;
}

.hero-ctas .btn-outline small {
  font-weight: 400;
  font-size: 11px;
  color: var(--color-text-muted);
}

/* concept */
.concept {
  padding: 72px 24px;
  text-align: center;
}

.concept-illustration {
  margin: 40px auto 0;
  width: 100%;
  max-width: 760px;
  height: auto;
  display: block;
  border-radius: 10px;
}

.concept .eyebrow {
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--color-text-lighter);
}

.concept-catchcopy {
  margin: 20px auto;
  width: 100%;
  max-width: 340px;
  height: auto;
}

.concept p {
  margin: 0 auto;
  font-size: 14px;
  color: var(--color-text-light);
  max-width: 560px;
}

/* business */
.business {
  padding: 72px 24px;
}

.business-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.business-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  overflow: hidden;
}

.business-photo {
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-bg-alt);
}

.business-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.business-card span {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-body);
  text-align: center;
  padding: 0 16px 20px;
}

/* reasons */
.reasons {
  padding: 72px 24px;
  background: var(--color-bg-alt);
}

.reasons-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  max-width: var(--max-width);
  margin: 0 auto 40px;
}

.reason-card {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: #fff;
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.reason-card .num {
  font-size: 12px;
  color: #999;
}

.reason-card .headline {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text-mid);
}

.reason-card .stat {
  font-size: 30px;
  font-weight: 700;
  color: var(--color-text);
}

.reason-card .desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.reasons .cta-row {
  display: flex;
  justify-content: center;
}

/* flow */
.flow {
  padding: 72px 24px;
}

.flow-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

.flow-step {
  display: flex;
  gap: 24px;
}

.flow-rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 36px;
  flex-shrink: 0;
}

.flow-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-text);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
}

.flow-line {
  width: 1px;
  flex: 1;
  background: var(--color-border);
  margin-top: 4px;
}

.flow-body {
  flex: 1;
  display: flex;
  gap: 20px;
  padding-bottom: 36px;
  align-items: flex-start;
}

.flow-illust {
  width: 120px;
  height: 88px;
  flex-shrink: 0;
  border-radius: 10px;
  overflow: hidden;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
}

.flow-illust svg {
  width: 32px;
  height: 32px;
  color: #bbb;
}

.flow-illust img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.flow-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 4px;
}

.flow-text .title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text-mid);
}

.flow-text .desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* works */
.works {
  padding: 72px 24px;
  background: var(--color-bg-alt);
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto;
}

.case-card {
  border: 1px solid var(--color-border);
  background: #fff;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.case-card .case-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-lighter);
  letter-spacing: 0.05em;
}

.case-photos {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.case-photo {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: 10px;
  background: #eee;
}

.case-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.case-photo .tag {
  position: absolute;
  top: 8px;
  left: 8px;
  font-size: 10px;
  color: #fff;
  padding: 2px 8px;
  border-radius: 2px;
}

.case-photo .tag.before {
  background: rgba(80, 80, 80, 0.85);
}

.case-photo .tag.after {
  background: rgba(26, 26, 26, 0.9);
}

/* company */
.company {
  padding: 72px 24px;
}

.company-table {
  max-width: 640px;
  margin: 0 auto;
  border-top: 1px solid var(--color-border-light);
}

.company-row {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.company-row dt {
  width: 120px;
  flex-shrink: 0;
  font-size: 13px;
  color: var(--color-text-lighter);
}

.company-row dd {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-mid);
}

/* contact */
.contact {
  padding: 72px 24px;
  background: var(--color-bg-alt);
}

.contact-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 32px;
  max-width: 1000px;
  margin: 0 auto;
}

.contact-form {
  background: #fff;
  border: 1px solid var(--color-border);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  font-size: 12px;
  color: var(--color-text-muted);
}

.field .required {
  color: #b33;
}

.field input,
.field select,
.field textarea {
  font-family: inherit;
  font-size: 14px;
  padding: 10px 12px;
  border: 1px solid #ccc;
  border-radius: 2px;
  background: #fff;
  color: var(--color-text-mid);
}

.field textarea {
  resize: vertical;
  min-height: 110px;
}

.field-row {
  display: flex;
  gap: 16px;
}

.field-row .field {
  flex: 1;
}

.radio-row {
  display: flex;
  gap: 20px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.radio-row label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
}

.contact-form .submit-row {
  display: flex;
  justify-content: center;
  margin-top: 4px;
}

.contact-aside {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-card {
  background: #fff;
  border: 1px solid var(--color-border);
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
}

.qr-box {
  width: 130px;
  height: 130px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  object-fit: contain;
  padding: 8px;
}

.contact-card .tel-number {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
}

.contact-card .tel-sub {
  font-size: 12px;
  color: #999;
}

/* footer */
.site-footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: 40px 24px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-company {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-company .name {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
}

.footer-company span {
  font-size: 12px;
  color: var(--color-footer-muted);
}

.footer-nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--color-footer-muted);
}

.footer-copy {
  font-size: 11px;
  color: #888;
}

/* responsive */
@media (max-width: 900px) {
  .business-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .reasons-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 1024px) {
  .site-nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 24px;
    gap: 16px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease;
  }

  .site-nav.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .header-tel,
  .header-actions .btn {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }
}

@media (max-width: 768px) {
  .works-grid {
    grid-template-columns: 1fr;
  }

  .mobile-break {
    display: block;
  }

  .flow-body {
    flex-direction: column;
    gap: 12px;
  }

  .flow-illust {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
  }
}

@media (max-width: 560px) {
  .business-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .reasons-grid {
    grid-template-columns: 1fr;
  }
  .field-row {
    flex-direction: column;
  }
  .footer-top {
    flex-direction: column;
  }
}