/* ==========================================================================
   LayerBridge 共通スタイルシート
   一次情報: SPEC.md / デザイン規則: DESIGN.md
   - モバイルファースト（320px を下限とする）
   - デザイントークンは DESIGN.md 4.1 の推奨値をそのまま使用
   ========================================================================== */

:root {
  --color-bg: #ffffff;
  --color-surface: #f7f9fc;
  --color-primary: #1e3a5f;
  --color-accent: #2563eb;
  --color-accent-strong: #1d4ed8;
  --color-heading: #0f172a;
  --color-text: #334155;
  --color-muted: #64748b;
  --color-border: #e2e8f0;
  --color-white: #ffffff;

  --font-body: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic",
    "Meiryo", system-ui, -apple-system, sans-serif;

  --container-max: 1120px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-card: 0 4px 20px rgb(15 23 42 / 5%);
}

/* --------------------------------------------------------------------------
   基本
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-wrap: break-word;
}

img,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

h1,
h2,
h3,
h4 {
  color: var(--color-heading);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.02em;
  text-wrap: balance;
  margin: 0 0 16px;
}

h1 {
  font-size: clamp(2rem, 1.4rem + 2.4vw, 3.25rem);
}

h2 {
  font-size: clamp(1.5rem, 1.3rem + 0.9vw, 2rem);
}

h3 {
  font-size: 1.25rem;
}

p {
  margin: 0 0 16px;
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--color-accent-strong);
}

ul,
ol {
  margin: 0 0 16px;
  padding-left: 1.4em;
}

li + li {
  margin-top: 8px;
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 32px 0;
}

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 20px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   実習告知・スキップリンク
   -------------------------------------------------------------------------- */
.course-notice {
  margin: 0;
  padding: 10px 20px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.6;
  text-align: center;
  letter-spacing: 0.02em;
}

.skip-link {
  position: absolute;
  left: 8px;
  top: -60px;
  z-index: 100;
  display: inline-block;
  padding: 10px 18px;
  background: var(--color-primary);
  color: var(--color-white);
  font-weight: 700;
  text-decoration: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  transition: top 0.15s ease-in-out;
}

.skip-link:focus {
  top: 0;
  color: var(--color-white);
}

/* --------------------------------------------------------------------------
   ヘッダー / ナビゲーション
   -------------------------------------------------------------------------- */
.site-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  color: var(--color-primary);
  text-decoration: none;
}

.brand:hover {
  color: var(--color-primary);
}

.brand-mark {
  width: 32px;
  height: 32px;
  flex: none;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 14px;
  background: var(--color-white);
  color: var(--color-primary);
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
}

.nav-toggle:hover {
  background: var(--color-surface);
}

.nav-toggle-icon {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  top: 6px;
}

.site-nav {
  flex: 1 0 100%;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 8px 0 16px;
  display: grid;
  gap: 4px;
}

.site-nav a {
  display: block;
  padding: 12px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-heading);
  font-weight: 500;
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--color-accent);
  background: var(--color-surface);
}

.site-nav a[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 700;
  box-shadow: inset 0 -3px 0 var(--color-accent);
}

.nav-cta a {
  margin-top: 8px;
  background: var(--color-accent);
  color: var(--color-white);
  font-weight: 700;
  text-align: center;
}

.nav-cta a:hover,
.nav-cta a:focus-visible {
  background: var(--color-accent-strong);
  color: var(--color-white);
}

/* JavaScript が無効な環境では、モバイルでもナビゲーションを常時表示する */
@media (max-width: 1023.98px) {
  html.js .site-nav {
    display: none;
  }

  html.js .site-nav.is-open {
    display: block;
    border-top: 1px solid var(--color-border);
  }

  html.js .nav-toggle {
    display: inline-flex;
  }
}

@media (min-width: 1024px) {
  .header-inner {
    flex-wrap: nowrap;
    min-height: 76px;
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    flex: 0 1 auto;
  }

  .nav-list {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0;
  }

  .site-nav a {
    padding: 10px 14px;
  }

  .nav-cta a {
    margin-top: 0;
    padding: 10px 20px;
    border-radius: var(--radius-md);
  }
}

/* --------------------------------------------------------------------------
   ボタン
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 12px 24px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font: inherit;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease-in-out, color 0.15s ease-in-out,
    border-color 0.15s ease-in-out;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn--primary:hover {
  background: var(--color-accent-strong);
  color: var(--color-white);
}

.btn--secondary {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--secondary:hover {
  background: var(--color-surface);
  color: var(--color-primary);
}

.btn--inverse {
  background: var(--color-white);
  color: var(--color-primary);
}

.btn--inverse:hover {
  background: #e8eef6;
  color: var(--color-primary);
}

.btn--ghost {
  background: transparent;
  color: var(--color-white);
  border-color: rgb(255 255 255 / 60%);
}

.btn--ghost:hover {
  background: rgb(255 255 255 / 12%);
  color: var(--color-white);
}

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

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

/* --------------------------------------------------------------------------
   セクション
   -------------------------------------------------------------------------- */
.section {
  padding: 56px 0;
}

.section--surface {
  background: var(--color-surface);
}

.section--tight {
  padding: 40px 0;
}

.section-head {
  max-width: 760px;
  margin-bottom: 32px;
}

.section-head p:last-child {
  margin-bottom: 0;
}

.section > .container > :last-child {
  margin-bottom: 0;
}

.page-intro {
  max-width: 760px;
  font-size: 17px;
}

.lead {
  font-size: 17px;
  max-width: 640px;
}

.section-anchor {
  scroll-margin-top: 24px;
}

@media (min-width: 768px) {
  .section {
    padding: 76px 0;
  }

  .section--tight {
    padding: 56px 0;
  }

  .container {
    padding-inline: 24px;
  }
}

@media (min-width: 1024px) {
  .section {
    padding: 88px 0;
  }

  .container {
    padding-inline: 32px;
  }
}

/* --------------------------------------------------------------------------
   ヒーロー
   -------------------------------------------------------------------------- */
.hero {
  padding: 40px 0 48px;
  background: var(--color-white);
}

.hero-inner {
  display: grid;
  gap: 32px;
  align-items: center;
}

.hero h1 {
  margin-bottom: 20px;
}

.hero-figure {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px;
}

.hero-figure img {
  width: 100%;
}

@media (min-width: 1024px) {
  .hero {
    padding: 72px 0 80px;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    gap: 56px;
  }

  .hero-figure {
    padding: 24px;
  }
}

/* --------------------------------------------------------------------------
   カード
   -------------------------------------------------------------------------- */
.card-grid {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.card-grid li {
  margin: 0;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  height: 100%;
  padding: 24px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.card h3 {
  margin: 0;
  font-size: 1.25rem;
}

.card > p {
  margin: 0;
}

.card-link {
  margin-top: auto;
  padding-top: 8px;
  font-weight: 700;
}

@media (min-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .card {
    padding: 28px;
  }
}

@media (min-width: 1024px) {
  .card-grid--3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* --------------------------------------------------------------------------
   進め方（番号付きステップ）
   -------------------------------------------------------------------------- */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.steps li {
  margin: 0;
  padding: 24px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  margin-bottom: 12px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 700;
}

.steps h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.steps p {
  margin: 0;
}

@media (min-width: 768px) {
  .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }
}

/* --------------------------------------------------------------------------
   サービス紹介
   -------------------------------------------------------------------------- */
.service {
  display: grid;
  gap: 16px;
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}

.service:first-of-type {
  border-top: none;
  padding-top: 8px;
}

.service h2 {
  margin-bottom: 12px;
  font-size: clamp(1.35rem, 1.15rem + 0.9vw, 1.75rem);
}

.service p {
  margin-bottom: 16px;
}

.service h3 {
  font-size: 1rem;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.service-body {
  display: grid;
  gap: 24px;
}

@media (min-width: 1024px) {
  .service {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 56px;
    padding: 48px 0;
  }
}

.check-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.check-list li {
  position: relative;
  margin: 0;
  padding-left: 28px;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.7em;
  width: 10px;
  height: 5px;
  border-left: 2px solid var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
  transform: rotate(-45deg);
}

/* --------------------------------------------------------------------------
   導入モデルケース
   -------------------------------------------------------------------------- */
.case {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
  scroll-margin-top: 24px;
}

.case:first-of-type {
  border-top: none;
  padding-top: 8px;
}

.case-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px;
}

.case-card h2 {
  font-size: clamp(1.3rem, 1.1rem + 0.9vw, 1.625rem);
  margin-bottom: 8px;
}

.case-meta {
  margin: 0 0 20px;
  font-size: 14px;
  color: var(--color-muted);
  font-weight: 500;
}

.case-rows {
  margin: 0;
  display: grid;
  gap: 16px;
}

.case-rows dt {
  margin: 0 0 4px;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
}

.case-rows dd {
  margin: 0;
}

@media (min-width: 768px) {
  .case-card {
    padding: 32px;
  }
}

/* --------------------------------------------------------------------------
   注記・コールアウト
   -------------------------------------------------------------------------- */
.note {
  margin: 0 0 32px;
  padding: 16px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  color: var(--color-heading);
  font-weight: 500;
}

.note strong {
  display: block;
  margin-bottom: 4px;
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   会社情報テーブル
   -------------------------------------------------------------------------- */
.company-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
}

.company-table th,
.company-table td {
  padding: 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--color-border);
}

.company-table th {
  width: 34%;
  background: var(--color-surface);
  color: var(--color-primary);
  font-weight: 700;
}

@media (max-width: 767.98px) {
  .company-table th,
  .company-table td {
    display: block;
    width: auto;
    padding: 0;
    border: none;
  }

  .company-table tr {
    display: block;
    margin-bottom: 12px;
    padding: 16px;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
  }

  .company-table th {
    background: none;
    font-size: 14px;
    margin-bottom: 4px;
  }
}

/* --------------------------------------------------------------------------
   最終CTA
   -------------------------------------------------------------------------- */
.cta-band {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 56px 0;
}

.cta-band h2 {
  color: var(--color-white);
  margin-bottom: 12px;
}

.cta-band p {
  color: rgb(255 255 255 / 88%);
  max-width: 640px;
}

.cta-band .button-row {
  margin-top: 24px;
}

@media (min-width: 768px) {
  .cta-band {
    padding: 72px 0;
  }
}

/* --------------------------------------------------------------------------
   お問い合わせフォーム（デモUI）
   -------------------------------------------------------------------------- */
.form-card {
  max-width: 720px;
  padding: 24px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.form-field {
  margin-bottom: 24px;
}

.form-field label {
  display: block;
  margin-bottom: 8px;
  color: var(--color-heading);
  font-weight: 700;
}

.form-control {
  width: 100%;
  padding: 12px 14px;
  min-height: 48px;
  font: inherit;
  font-size: 16px;
  color: var(--color-heading);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  appearance: none;
}

select.form-control {
  background-image: linear-gradient(45deg, transparent 50%, var(--color-primary) 50%),
    linear-gradient(135deg, var(--color-primary) 50%, transparent 50%);
  background-position: calc(100% - 22px) 22px, calc(100% - 16px) 22px;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  padding-right: 44px;
}

textarea.form-control {
  min-height: 168px;
  resize: vertical;
}

.form-control::placeholder {
  color: #94a3b8;
}

.form-control:hover {
  border-color: #cbd5e1;
}

.form-control:focus {
  border-color: var(--color-accent);
  outline: 3px solid rgb(37 99 235 / 35%);
  outline-offset: 1px;
}

.demo-result {
  margin-top: 20px;
  padding: 16px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  font-weight: 700;
}

.demo-result[hidden] {
  display: none;
}

@media (min-width: 768px) {
  .form-card {
    padding: 32px;
  }
}

/* --------------------------------------------------------------------------
   フッター
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-primary);
  color: var(--color-white);
  padding-top: 48px;
}

.footer-inner {
  display: grid;
  gap: 32px;
  padding-bottom: 32px;
}

.site-footer .brand,
.site-footer .brand:hover {
  color: var(--color-white);
  padding: 0;
}

.footer-tagline {
  margin: 12px 0 0;
  color: rgb(255 255 255 / 88%);
  font-size: 15px;
}

.footer-nav h2 {
  color: var(--color-white);
  font-size: 15px;
  margin-bottom: 12px;
}

.footer-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.footer-nav a {
  color: var(--color-white);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.footer-nav a:hover {
  color: #dbe6f3;
}

.footer-meta p {
  margin: 0 0 8px;
  font-size: 14px;
  color: rgb(255 255 255 / 85%);
}

.footer-bottom {
  border-top: 1px solid rgb(255 255 255 / 20%);
  padding: 16px 0;
}

.footer-bottom p {
  margin: 0;
  font-size: 14px;
  color: rgb(255 255 255 / 85%);
}

@media (min-width: 768px) {
  .footer-inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.7fr) minmax(0, 1.2fr);
    gap: 40px;
    padding-bottom: 48px;
  }
}

/* --------------------------------------------------------------------------
   動きを抑えたい設定の尊重
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .btn:active {
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   補助ラベル（セクション見出し上の短いラベル・CTA注記）
   -------------------------------------------------------------------------- */
.section-label {
  margin: 0 0 8px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-accent);
}

.cta-note {
  margin: 24px 0 0;
  font-size: 14px;
  color: rgb(255 255 255 / 78%);
}

/* --------------------------------------------------------------------------
   ケース内ジャンプリンク（チップ）
   -------------------------------------------------------------------------- */
.chip-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip-list li {
  margin: 0;
}

.chip-list a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 14px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
}

.chip-list a:hover {
  background: var(--color-surface);
  border-color: #cbd5e1;
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   企業理念（大きく見せる見出し）
   -------------------------------------------------------------------------- */
.philosophy {
  max-width: 22em;
  margin-bottom: 20px;
  font-size: clamp(1.6rem, 1.2rem + 1.8vw, 2.5rem);
  letter-spacing: 0.03em;
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   デモフォーム前の注意表示・ホームへ戻るリンク
   -------------------------------------------------------------------------- */
.demo-notice {
  max-width: 720px;
  margin: 0 0 24px;
  padding: 20px 24px;
  background: var(--color-surface);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  color: var(--color-heading);
}

.demo-notice strong {
  display: block;
  margin-bottom: 8px;
  color: var(--color-primary);
  font-size: 17px;
  line-height: 1.6;
}

.demo-notice p {
  margin: 0;
  font-size: 15px;
}

.back-home {
  margin: 32px 0 0;
}