:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: rgba(15, 23, 42, .55);
  --border: rgba(15, 23, 42, .10);
  
  /* カラーを明るい青系に統一 */
  --primary: #2563eb; 
  --primary-weak: rgba(37, 99, 235, .08);
  --accent: #93c5fd;
  
  --radius: 14px;
  --shadow: 0 6px 18px rgba(37, 99, 235, .08); /* シャドウも青ベースで明るく */
  --container: 1040px;
  --side: 20px;
  --lh: 1.8;
}

/* Base */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: #ffffff;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: var(--lh);
  letter-spacing: .02em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  max-width: 100%;
  height: auto;
}

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

a:hover {
  opacity: .9;
}

.container {
  width: min(var(--container), calc(100% - (var(--side) * 2)));
  margin-inline: auto;
}

/* Accessibility */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  left: 16px;
  top: 16px;
  width: auto;
  height: auto;
  padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
  z-index: 9999;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, .92);
  border-bottom: 1px solid rgba(37, 99, 235, .08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.mark {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary-weak), rgba(37, 99, 235, .05));
  border: 1px solid rgba(37, 99, 235, .15);
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  color: var(--primary);
}

.mark svg {
  width: 22px;
  height: 22px;
}

.brand-title {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand-title strong {
  font-size: 15.5px;
  letter-spacing: .06em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand-title span {
  font-size: 12.5px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

.nav a {
  font-size: 14px;
  color: rgba(15, 23, 42, .84);
  padding: 8px 10px;
  border-radius: 10px;
}

.nav a:focus-visible {
  outline: 3px solid rgba(37, 99, 235, .22);
  outline-offset: 2px;
}

.nav .btn {
  background: var(--primary);
  color: #fff;
  border: 1px solid rgba(0, 0, 0, .06);
  box-shadow: 0 10px 18px rgba(37, 99, 235, .18);
}

/* Mobile nav */
.menu-btn {
  display: none;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, .8);
  border-radius: 10px;
  padding: 8px;
  cursor: pointer;
  color: var(--text);
}

.menu-btn svg {
  width: 24px;
  height: 24px;
  display: block;
}

.menu-btn:focus-visible {
  outline: 3px solid rgba(37, 99, 235, .22);
  outline-offset: 2px;
}

.drawer {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 60;
}

.drawer[aria-hidden="false"] {
  display: block;
}

.drawer-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, .3);
}

.drawer-panel {
  position: absolute;
  top: 12px;
  right: 12px;
  left: 12px;
  background: var(--surface);
  border-radius: 18px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 14px;
}

.drawer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 6px;
}

.drawer-links a {
  padding: 12px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--primary-weak);
  color: var(--text);
}

.drawer-links a.btn {
  background: var(--primary);
  color: #fff;
  border-color: rgba(0, 0, 0, .08);
}

.drawer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.drawer-top strong {
  font-size: 14px;
  letter-spacing: .04em;
}

.drawer-close {
  border: 1px solid var(--border);
  background: #f8fafc;
  border-radius: 10px;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 13px;
}

/* Hero */
main {
  padding: 28px 0 64px;
}

.hero {
  padding: 34px 0 20px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 22px;
  align-items: start;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(37, 99, 235, .15);
  background: var(--primary-weak);
  color: var(--text);
  font-size: 13px;
  margin-bottom: 14px;
  width: fit-content;
}

.badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, .12);
}

.hero h1 {
  font-size: clamp(24px, 3.2vw, 36px);
  line-height: 1.35;
  margin: 0 0 10px;
  letter-spacing: .02em;
}

.hero p.lead {
  margin: 0 0 18px;
  color: rgba(15, 23, 42, .82);
  font-size: 15.5px;
  max-width: 56ch;
}

.hero .cta-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  transition: transform .12s ease, opacity .12s ease;
  user-select: none;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: rgba(0, 0, 0, .08);
  box-shadow: 0 12px 22px rgba(37, 99, 235, .18);
}

.btn-ghost {
  background: #f8fafc;
}

.btn svg {
  width: 16px;
  height: 16px;
}

.hero-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.hero-card h2 {
  font-size: 14px;
  margin: 0 0 10px;
  letter-spacing: .03em;
}

.checklist {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.check-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px 14px;
  border-radius: 16px;
  background: var(--primary-weak);
  border: 1px solid var(--border);
  font-size: 15px;
}

.check-text { min-width: 0; }

.check-lead {
  margin: 0;
  font-size: 0.92em;
  color: var(--muted);
  line-height: 1.4;
}

.check-main {
  margin: 2px 0 0;
  font-size: 1.06em;
  font-weight: 700;
  line-height: 1.55;
  word-break: keep-all;
}

.check-item .icon {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  margin-top: 2px;
  color: var(--primary);
}

/* Sections */
section {
  margin-top: 34px;
}

.section-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: var(--shadow);
  padding: 20px;
}

.section-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.section-title h2 {
  margin: 0;
  font-size: 18px;
  letter-spacing: .03em;
  color: var(--text);
}

.section-title .hint {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

.muted {
  color: var(--muted);
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 12px;
}

.tile {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 16px;
  background: var(--primary-weak);
}

.tile h3 {
  margin: 0 0 6px;
  font-size: 15px;
  letter-spacing: .02em;
}

.tile p {
  margin: 0;
  color: rgba(15, 23, 42, .82);
  font-size: 14px;
}

.tile .examples {
  margin-top: 10px;
  padding-left: 18px;
  color: rgba(15, 23, 42, .78);
  font-size: 13.5px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.chip {
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #ffffff;
  font-size: 13px;
  color: rgba(15, 23, 42, .82);
}

.lists {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 12px;
}

.list-box {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 16px;
  background: #f8fafc;
}

.list-box h3 {
  margin: 0 0 8px;
  font-size: 15px;
}

.list-box ul {
  margin: 0;
  padding-left: 18px;
  color: rgba(15, 23, 42, .82);
  font-size: 14px;
}

/* Office */
.office-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 12px;
}

.kv {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 14px 16px;
  background: #ffffff;
}

.kv dt {
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 4px;
}

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

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 12px;
}

.contact-form-tile {
  background: #ffffff !important;
}

.contact-info-tile {
  background: var(--primary-weak) !important;
  border: 1px dashed var(--border) !important;
}

.checklist-mini {
  margin: 0;
  padding: 0;
  list-style: none;
}

.checklist-mini li {
  padding: 4px 0;
  font-size: 14px;
}

.note {
  font-size: 13px;
  color: var(--muted);
  margin-top: 10px;
}

/* Footer */
footer {
  padding: 30px 0 40px;
  color: var(--muted);
  font-size: 13px;
}

footer .footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

/* Responsive */
@media (max-width: 860px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .two-col, .lists, .office-grid, .contact-grid {
    grid-template-columns: 1fr;
  }

  .nav {
    display: none;
  }

  .menu-btn {
    display: block;
  }
}