/* ============================================================
   AIE Corporate Site — style.css
   白黒ベースのミニマルデザイン / モバイルファースト
   ============================================================ */

:root {
  --color-black: #0a0a0a;
  --color-white: #ffffff;
  --color-gray: #666666;
  --color-gray-light: #e5e5e5;
  --color-bg-alt: #f6f6f6;
  --header-height: 64px;
  --container-max: 1120px;
  --font-sans: "Helvetica Neue", Helvetica, Arial,
    "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP",
    Meiryo, sans-serif;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-black);
  background: var(--color-white);
  line-height: 1.8;
  font-size: 15px;
  letter-spacing: 0.02em;
  padding-top: var(--header-height);
}

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

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

ul,
ol {
  list-style: none;
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 72px 0;
}

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

/* セクション見出し(英語ラベル + 日本語) */
.section-label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-gray);
  margin-bottom: 8px;
}

.section-title {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.04em;
  margin-bottom: 32px;
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-gray-light);
}

.site-header__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.site-header__logo img {
  height: 26px;
  width: auto;
}

/* ---------- Nav (mobile: drawer / desktop: inline) ---------- */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 110;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-black);
  transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.site-nav {
  position: fixed;
  inset: var(--header-height) 0 auto 0;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-light);
  transform: translateY(-8px);
  opacity: 0;
  visibility: hidden;
  transition: transform 0.25s, opacity 0.25s, visibility 0.25s;
}

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

.site-nav ul {
  display: flex;
  flex-direction: column;
  padding: 12px 20px 24px;
}

.site-nav a {
  display: block;
  padding: 14px 4px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  border-bottom: 1px solid var(--color-gray-light);
}

.site-nav a[aria-current="page"] {
  color: var(--color-gray);
}

/* ---------- Hero (トップページ) ---------- */
.hero {
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  padding: 64px 0;
}

.hero__title {
  font-size: clamp(40px, 10vw, 96px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: 0.01em;
}

.hero__lead {
  margin-top: 24px;
  font-size: 15px;
  color: var(--color-gray);
  max-width: 560px;
}

/* ---------- ページ下層のタイトル帯 ---------- */
.page-hero {
  padding: 72px 0 48px;
  border-bottom: 1px solid var(--color-gray-light);
}

.page-hero__title {
  font-size: clamp(32px, 8vw, 64px);
  font-weight: 800;
  line-height: 1.15;
}

.page-hero__lead {
  margin-top: 16px;
  color: var(--color-gray);
  max-width: 640px;
}

/* ---------- カード ---------- */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.card {
  display: block;
  border: 1px solid var(--color-black);
  padding: 28px 24px;
  background: var(--color-white);
  transition: background 0.25s, color 0.25s;
}

a.card:hover {
  background: var(--color-black);
  color: var(--color-white);
}

.card__num {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-gray);
}

a.card:hover .card__num {
  color: rgba(255, 255, 255, 0.6);
}

.card__title {
  font-size: 20px;
  font-weight: 700;
  margin: 8px 0 12px;
}

.card__text {
  font-size: 14px;
  line-height: 1.9;
}

/* ---------- サービス詳細ブロック ---------- */
.service-block {
  padding: 48px 0;
  border-bottom: 1px solid var(--color-gray-light);
}

.service-block:last-child {
  border-bottom: none;
}

.service-block__num {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-gray);
}

.service-block__title {
  font-size: 24px;
  font-weight: 700;
  margin: 8px 0 16px;
}

.service-block__text {
  max-width: 720px;
}

.service-block__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.service-block__tags li {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  border: 1px solid var(--color-black);
  padding: 4px 12px;
}

/* ---------- 会社概要テーブル ---------- */
.company-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.company-table th,
.company-table td {
  padding: 16px 8px;
  border-bottom: 1px solid var(--color-gray-light);
  text-align: left;
  vertical-align: top;
}

.company-table th {
  width: 96px;
  font-weight: 700;
  white-space: nowrap;
}

/* ---------- ボタン ---------- */
.btn {
  display: inline-block;
  padding: 16px 48px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.15em;
  border: 1px solid var(--color-black);
  background: var(--color-black);
  color: var(--color-white);
  transition: background 0.25s, color 0.25s;
}

.btn:hover {
  background: var(--color-white);
  color: var(--color-black);
}

.btn--ghost {
  background: var(--color-white);
  color: var(--color-black);
}

.btn--ghost:hover {
  background: var(--color-black);
  color: var(--color-white);
}

/* ---------- CTA帯 ---------- */
.cta {
  background: var(--color-black);
  color: var(--color-white);
  text-align: center;
  padding: 80px 0;
}

.cta__title {
  font-size: clamp(24px, 6vw, 40px);
  font-weight: 800;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.cta__text {
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 32px;
  font-size: 14px;
}

.cta .btn {
  background: var(--color-white);
  color: var(--color-black);
  border-color: var(--color-white);
}

.cta .btn:hover {
  background: transparent;
  color: var(--color-white);
}

/* ---------- Googleフォーム埋め込み ---------- */
.form-embed {
  margin-top: 40px;
  border: 1px solid var(--color-gray-light);
}

.form-embed iframe {
  display: block;
  width: 100%;
  min-height: 900px;
  border: none;
}

.form-note {
  margin-top: 16px;
  font-size: 13px;
  color: var(--color-gray);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-black);
  color: var(--color-white);
  padding: 56px 0 32px;
}

.site-footer__logo img {
  height: 32px;
  width: auto;
}

.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  margin: 32px 0 40px;
}

.site-footer__nav a {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.8);
}

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

.site-footer__copy {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.5);
}

/* ---------- スクロール表示アニメーション ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ============================================================
   AI動画製作所 サービスページ用
   ============================================================ */

/* ---------- サービスヒーロー ---------- */
.service-hero {
  padding: 64px 0;
  border-bottom: 1px solid var(--color-gray-light);
}

.service-hero__logo {
  width: min(460px, 88%);
  height: auto;
}

.service-hero__tagline {
  font-size: clamp(24px, 6.4vw, 48px);
  font-weight: 800;
  line-height: 1.35;
  margin-top: 28px;
}

.service-hero__lead {
  margin-top: 16px;
  color: var(--color-gray);
  max-width: 640px;
}

.service-hero .btn {
  margin-top: 32px;
}

/* ---------- サンプル動画枠 ---------- */
.video-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.video-slot {
  border: 1px solid var(--color-gray-light);
  background: var(--color-white);
}

.video-slot__frame {
  position: relative;
  aspect-ratio: 9 / 16;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray);
  font-size: 13px;
  letter-spacing: 0.1em;
}

.video-slot__frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.video-slot__label {
  padding: 12px 16px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  border-top: 1px solid var(--color-gray-light);
}

/* ---------- 料金 ---------- */
.price-group {
  margin-top: 48px;
}

.price-group__title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.price-group__desc {
  font-size: 14px;
  color: var(--color-gray);
  margin-bottom: 20px;
  max-width: 720px;
}

.price-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  background: var(--color-white);
}

.price-table th,
.price-table td {
  border: 1px solid var(--color-gray-light);
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
}

.price-table thead th {
  background: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
  font-size: 13px;
  letter-spacing: 0.1em;
}

.price-table td:last-child {
  white-space: nowrap;
  font-weight: 700;
}

/* 月額プランカード */
.plan-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.plan-card {
  position: relative;
  border: 1px solid var(--color-black);
  background: var(--color-white);
  padding: 32px 24px;
}

.plan-card--featured {
  background: var(--color-black);
  color: var(--color-white);
}

.plan-card__badge {
  position: absolute;
  top: -12px;
  left: 20px;
  background: var(--color-white);
  color: var(--color-black);
  border: 1px solid var(--color-black);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  padding: 3px 12px;
}

.plan-card__name {
  font-size: 18px;
  font-weight: 700;
}

.plan-card__price {
  font-size: 28px;
  font-weight: 800;
  margin: 12px 0 4px;
}

.plan-card__price small {
  font-size: 13px;
  font-weight: 700;
}

.plan-card__desc {
  font-size: 14px;
}

/* 注記 */
.notes {
  margin-top: 32px;
  font-size: 13px;
  color: var(--color-gray);
}

.notes li {
  padding-left: 1.4em;
  text-indent: -1.4em;
  margin-top: 6px;
}

.notes li::before {
  content: "※ ";
}

/* ---------- 制作フロー ---------- */
.flow-list li {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-gray-light);
  align-items: baseline;
}

.flow-list__num {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--color-gray);
  white-space: nowrap;
}

.flow-list__body strong {
  display: block;
  font-size: 16px;
  margin-bottom: 4px;
}

.flow-list__body p {
  font-size: 14px;
  color: var(--color-gray);
}

/* ---------- FAQ ---------- */
.faq details {
  border-bottom: 1px solid var(--color-gray-light);
}

.faq summary {
  padding: 18px 32px 18px 0;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  position: relative;
  list-style: none;
}

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

.faq summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
}

.faq details[open] summary::after {
  content: "−";
}

.faq details p {
  padding: 0 0 20px;
  font-size: 14px;
  color: var(--color-gray);
  max-width: 720px;
}

/* ---------- フッター運営会社表記 ---------- */
.site-footer__operator {
  font-size: 12px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 24px;
}

/* ============================================================
   Tablet & Desktop (min-width: 768px)
   ============================================================ */
@media (min-width: 768px) {
  body {
    font-size: 16px;
  }

  .section {
    padding: 112px 0;
  }

  .section-title {
    font-size: 36px;
  }

  /* ナビ: ハンバーガーを隠して横並びに */
  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    background: transparent;
    border: none;
    transition: none;
  }

  .site-nav ul {
    flex-direction: row;
    gap: 36px;
    padding: 0;
  }

  .site-nav a {
    padding: 0;
    border: none;
    font-size: 13px;
    position: relative;
  }

  .site-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 100%;
    height: 2px;
    background: var(--color-black);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.25s;
  }

  .site-nav a:hover::after,
  .site-nav a[aria-current="page"]::after {
    transform: scaleX(1);
  }

  .site-nav a[aria-current="page"] {
    color: var(--color-black);
  }

  .card-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .card {
    padding: 36px 32px;
  }

  .company-table th {
    width: 200px;
    padding-left: 0;
  }

  .service-block {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 24px;
    padding: 64px 0;
  }

  .service-block__title {
    margin-top: 0;
  }

  /* AI動画製作所 サービスページ */
  .service-hero {
    padding: 96px 0;
  }

  .video-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .plan-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .price-table {
    font-size: 15px;
  }

  .price-group {
    margin-top: 64px;
  }
}