/* ==========================================================================
   PPnR Corporate Site — style.css
   構成: 1) CSS変数  2) リセット  3) 基本タイポグラフィ  4) レイアウト共通
   詳細仕様: docs/02_詳細仕様書.md 3章
   ========================================================================== */

/* ---------- 1. CSS変数 ---------- */
:root {
  /* Color */
  --color-bg: #ffffff;
  --color-bg-subtle: #f5f5f7;
  --color-text: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-border: #d2d2d7;

  --color-accent: #f7931e;            /* ブランドオレンジ：ロゴ・装飾のみに使用 */
  --color-accent-strong: #ad6512;     /* 文字色・リンクに使う暗色オレンジ（白背景で4.5:1以上） */
  --color-accent-tint: color-mix(in srgb, var(--color-accent) 12%, white);

  --color-cta-bg: #1d1d1f;
  --color-cta-bg-hover: #000000;
  --color-cta-text: #ffffff;

  --color-error: #d70015;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro JP", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Yu Gothic Medium", "Noto Sans JP", Meiryo, sans-serif;

  --fs-h1: clamp(2.25rem, 5vw, 3.5rem);
  --fs-h2: clamp(1.75rem, 3.5vw, 2.5rem);
  --fs-h3: clamp(1.25rem, 2vw, 1.5rem);
  --fs-body: clamp(1rem, 1.2vw, 1.125rem);
  --fs-caption: 0.875rem;

  /* Layout */
  --content-max-width: 1120px;
  --side-padding: clamp(20px, 5vw, 80px);
  --section-gap: clamp(64px, 10vw, 160px);

  --radius-sm: 8px;
  --radius-lg: 16px;
  --radius-pill: 999px;

  --transition-base: 0.2s ease;
}

/* ---------- 2. リセット ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

@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;
  }
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

button,
input,
textarea,
select {
  font: inherit;
  color: inherit;
}

/* ---------- 3. 基本タイポグラフィ ---------- */
h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
  line-height: 1.3;
}

h1 {
  font-size: var(--fs-h1);
  line-height: 1.2;
}

h2 {
  font-size: var(--fs-h2);
}

h3 {
  font-size: var(--fs-h3);
}

p {
  margin: 0;
}

.text-secondary {
  color: var(--color-text-secondary);
}

.text-caption {
  font-size: var(--fs-caption);
  color: var(--color-text-secondary);
}

/* リンク文字（本文中のテキストリンク）はアクセシブルな暗色オレンジを使用 */
.link-accent {
  color: var(--color-accent-strong);
  text-underline-offset: 3px;
}

.link-accent:hover {
  text-decoration: underline;
}

/* ---------- 4. レイアウト共通 ---------- */
.container {
  max-width: var(--content-max-width);
  margin-inline: auto;
  padding-inline: var(--side-padding);
}

.section {
  padding-block: calc(var(--section-gap) / 2);
}

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

/* キーボード操作時のフォーカス可視化 */
:focus-visible {
  outline: 2px solid var(--color-accent-strong);
  outline-offset: 2px;
}

/* スクリーンリーダー専用テキスト（スキップリンク等で使用） */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   5. ボタン
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.75em 1.5em;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 1rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-base), color var(--transition-base),
    border-color var(--transition-base), transform var(--transition-base);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-cta-bg);
  color: var(--color-cta-text);
}

.btn--primary:hover {
  background: var(--color-cta-bg-hover);
  transform: scale(1.02);
}

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-text);
}

.btn--secondary:hover {
  background: var(--color-bg-subtle);
}

.btn--sm {
  padding: 0.5em 1.25em;
  font-size: 0.875rem;
}

/* ==========================================================================
   6. スキップリンク
   ========================================================================== */
.skip-link {
  position: absolute;
  top: 0;
  left: 8px;
  z-index: 100;
  background: var(--color-cta-bg);
  color: var(--color-cta-text);
  padding: 0.75em 1.25em;
  border-radius: var(--radius-sm);
  line-height: normal;
  transform: translateY(-150%);
  transition: transform var(--transition-base);
}

.skip-link:focus {
  transform: translateY(8px);
}

/* ==========================================================================
   7. ヘッダー / グローバルナビ
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: transparent;
  transition: background-color var(--transition-base), backdrop-filter var(--transition-base),
    box-shadow var(--transition-base);
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 16px;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.site-logo__mark {
  height: 25px;
  width: auto;
}

.site-logo__text {
  font-weight: 600;
  font-size: 1.125rem;
  letter-spacing: 0.01em;
  color: var(--color-text);
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 32px;
}

.site-nav a:not(.btn) {
  font-size: 0.95rem;
  padding-block: 4px;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition-base), color var(--transition-base);
}

.site-nav a:not(.btn):hover,
.site-nav a:not(.btn)[aria-current="page"] {
  border-color: var(--color-accent);
}

/* ハンバーガーボタン（デスクトップでは非表示） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  cursor: pointer;
}

.nav-toggle__bar {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(4) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 767px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    inset: 0;
    top: 0;
    background: var(--color-bg);
    padding: 96px 24px 24px;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
  }

  .site-nav a:not(.btn) {
    font-size: 1.25rem;
  }

  body.nav-open {
    overflow: hidden;
  }
}

/* ==========================================================================
   8. フッター
   ========================================================================== */
.site-footer {
  background: var(--color-bg-subtle);
  margin-top: var(--section-gap);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding-block: 56px;
}

@media (min-width: 768px) {
  .site-footer__inner {
    grid-template-columns: 1.2fr 1fr 1fr;
  }
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.site-footer__logo {
  width: 56px;
  height: 56px;
}

.site-footer__nav ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.site-footer__note {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
}

.site-footer__bottom {
  border-top: 1px solid var(--color-border);
  padding-block: 20px;
}

/* ==========================================================================
   9. スクロールフェードイン
   ========================================================================== */
[data-fade] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-fade].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   10. ヒーロー（TOP）
   ========================================================================== */
.hero {
  padding-block: clamp(56px, 12vw, 120px) clamp(48px, 8vw, 96px);
}

/* リード文（ヒーロー／ページヘッダー／本文中の要約段落で共通利用） */
.lead {
  max-width: 42em;
  margin-top: 20px;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--color-text-secondary);
}

/* ボタン群（ヒーロー／ページヘッダーで共通利用） */
.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 40px;
}

/* ==========================================================================
   11. ページヘッダー（サブページ用の簡易ヒーロー）
   ========================================================================== */
.page-header {
  padding-block: clamp(48px, 10vw, 88px) clamp(32px, 6vw, 56px);
}

.page-header__eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  padding: 0.35em 0.9em;
  border-radius: var(--radius-pill);
  background: var(--color-accent-tint);
  color: var(--color-accent-strong);
  font-size: var(--fs-caption);
  font-weight: 600;
}

/* ==========================================================================
   12. サービスカード（2枚グリッド）
   ========================================================================== */
.service-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 48px;
}

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

.service-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 40px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.08);
}

.service-card__tag {
  align-self: flex-start;
  padding: 0.35em 0.9em;
  border-radius: var(--radius-pill);
  background: var(--color-accent-tint);
  color: var(--color-accent-strong);
  font-size: var(--fs-caption);
  font-weight: 600;
}

.service-card__link {
  margin-top: auto;
  font-weight: 600;
  color: var(--color-accent-strong);
}

.service-card__link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   13. 強み・特徴グリッド
   ========================================================================== */
.strength-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 48px;
}

@media (min-width: 600px) {
  .strength-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .strength-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.strength-card h3 {
  margin-bottom: 8px;
  font-size: 1.1rem;
}

.strength-card::before {
  content: "";
  display: block;
  width: 40px;
  height: 3px;
  margin-bottom: 16px;
  background: var(--color-accent);
  border-radius: var(--radius-pill);
}

/* ==========================================================================
   14. チェックリスト（学べること／特徴／対象 等）
   ========================================================================== */
.icon-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}

.icon-list li {
  position: relative;
  padding-left: 32px;
  line-height: 1.6;
}

.icon-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-accent-tint);
  border: 1.5px solid var(--color-accent-strong);
}

.icon-list li::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 0.55em;
  width: 6px;
  height: 10px;
  border-right: 2px solid var(--color-accent-strong);
  border-bottom: 2px solid var(--color-accent-strong);
  transform: rotate(45deg);
}

/* ==========================================================================
   15. 代表者メッセージ
   ========================================================================== */
.message-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
  margin-top: 48px;
}

@media (min-width: 768px) {
  .message-section {
    grid-template-columns: 240px 1fr;
    gap: 56px;
  }
}

.portrait-placeholder {
  width: 160px;
  height: 160px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-accent-tint);
}

.portrait-placeholder img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

.portrait-placeholder__mark {
  width: 56px;
  height: auto;
  opacity: 0.85;
}

.message-section__portrait {
  text-align: center;
}

.message-section__name {
  margin-top: 20px;
  font-weight: 600;
}

.message-section__role {
  color: var(--color-text-secondary);
}

.message-section__body p + p {
  margin-top: 16px;
}

/* ==========================================================================
   16. CTAバンド
   ========================================================================== */
.cta-band {
  text-align: center;
  padding-block: clamp(56px, 10vw, 96px);
}

.cta-band h2 {
  margin-bottom: 16px;
}

.cta-band__lead {
  max-width: 32em;
  margin-inline: auto;
  margin-bottom: 32px;
  color: var(--color-text-secondary);
}

.cta-band__actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   17. 会社情報テーブル
   ========================================================================== */
.info-table {
  margin-top: 40px;
  border-top: 1px solid var(--color-border);
}

.info-table__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding-block: 20px;
  border-bottom: 1px solid var(--color-border);
}

@media (min-width: 600px) {
  .info-table__row {
    grid-template-columns: 200px 1fr;
    gap: 24px;
  }
}

.info-table__term {
  font-weight: 600;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   18. 沿革タイムライン
   ========================================================================== */
.timeline {
  margin-top: 32px;
  border-left: 2px solid var(--color-border);
}

.timeline__item {
  position: relative;
  padding: 0 0 32px 28px;
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent);
}

.timeline__year {
  font-weight: 600;
  color: var(--color-accent-strong);
}

/* ==========================================================================
   19. 料金テーブル
   ========================================================================== */
.table-scroll {
  margin-top: 24px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.pricing-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
}

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

.pricing-table th {
  color: var(--color-text-secondary);
  font-weight: 600;
  font-size: var(--fs-caption);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.pricing-note {
  margin-top: 16px;
  color: var(--color-text-secondary);
  font-size: var(--fs-caption);
}

/* ==========================================================================
   20. FAQ（details/summary）
   ========================================================================== */
.faq-list {
  margin-top: 24px;
  border-top: 1px solid var(--color-border);
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding-block: 20px;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  flex-shrink: 0;
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-accent-strong);
  transition: transform var(--transition-base);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  margin-top: 12px;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   21. ステップ（開催の流れ）
   ========================================================================== */
.step-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 32px;
  counter-reset: step;
}

@media (min-width: 700px) {
  .step-list {
    grid-template-columns: repeat(5, 1fr);
  }
}

.step-list li {
  position: relative;
  padding-top: 48px;
}

.step-list li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: 0;
  left: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-cta-bg);
  color: var(--color-cta-text);
  font-weight: 600;
  font-size: 0.875rem;
}

.step-list h3 {
  font-size: 1rem;
  margin-bottom: 4px;
}

/* ==========================================================================
   22. プライバシーポリシー本文
   ========================================================================== */
.policy-body h2 {
  font-size: 1.25rem;
  margin-top: 48px;
  margin-bottom: 12px;
}

.policy-body h2:first-child {
  margin-top: 0;
}

.policy-body p,
.policy-body li {
  color: var(--color-text-secondary);
  margin-top: 8px;
}

.policy-body ul {
  padding-left: 1.25em;
  list-style: disc;
}

/* ==========================================================================
   23. お問い合わせフォーム
   ========================================================================== */
.form {
  max-width: 640px;
  margin-top: 40px;
}

.form-status {
  padding: 16px 20px;
  margin-bottom: 32px;
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--color-error) 8%, white);
  color: var(--color-error);
  font-weight: 600;
}

.form-field {
  margin-bottom: 28px;
}

.form-field label,
.form-field legend {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

.form-field__optional {
  font-weight: 400;
  color: var(--color-text-secondary);
  font-size: var(--fs-caption);
}

.form-field input[type="text"],
.form-field input[type="email"],
.form-field input[type="tel"],
.form-field textarea {
  width: 100%;
  padding: 0.85em 1em;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  transition: border-color var(--transition-base);
}

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

.form-field textarea {
  min-height: 160px;
  resize: vertical;
}

.form-field fieldset {
  border: none;
  padding: 0;
  margin: 0;
}

.radio-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.radio-option {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 400;
}

.radio-option input {
  width: 18px;
  height: 18px;
  accent-color: var(--color-accent-strong);
}

.checkbox-field {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-weight: 400;
}

.checkbox-field input {
  width: 18px;
  height: 18px;
  margin-top: 3px;
  flex-shrink: 0;
  accent-color: var(--color-accent-strong);
}

.form-error {
  display: none;
  margin-top: 8px;
  color: var(--color-error);
  font-size: var(--fs-caption);
}

.form-field.is-invalid input:not([type="radio"]):not([type="checkbox"]),
.form-field.is-invalid textarea {
  border-color: var(--color-error);
}

.form-field.is-invalid .form-error {
  display: block;
}

/* ==========================================================================
   24. ページヘッダー用イメージ（サービスページの風景写真）
   ========================================================================== */
.page-hero-image {
  margin-top: 40px;
}

.page-hero-image img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

/* ハニーポット：人間には見えないがbotには入力可能な位置に配置 */
.honeypot-field {
  position: absolute;
  left: -9999px;
  top: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}