/* ─────────────────────────────────────────
   CSS カスタムプロパティ
───────────────────────────────────────── */
:root {
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-bg: #ffffff;
  --color-surface: #f8fafc;
  --color-primary: #1b2a4a;
  --color-primary-dark: #0e1a30;
  --color-dark: #1b2a4a;
  --color-white: #ffffff;
  --color-border: #e2e8f0;
  --color-accent: #4a7cdc;
  --color-line: #06c755;
  --font-sans: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
}

/* ─────────────────────────────────────────
   ベース
───────────────────────────────────────── */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

/* ─────────────────────────────────────────
   レイアウト
───────────────────────────────────────── */
.container {
  width: min(100% - 2.5rem, 68.75rem);
  margin-inline: auto;
}

/* ─────────────────────────────────────────
   ヘッダー
───────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.5rem;
}

.site-header__logo {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-primary);
}

.site-header__menu-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}

/* ハンバーガー */
.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 24px;
  height: 24px;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}

.hamburger.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.is-open span:nth-child(2) {
  opacity: 0;
}
.hamburger.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ─────────────────────────────────────────
   ナビゲーション
───────────────────────────────────────── */
.site-nav {
  display: none;
  position: absolute;
  top: calc(100% + 1px);
  left: 0;
  width: 100%;
  padding: 1.25rem;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.site-nav.is-open {
  display: block;
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  list-style: none;
}

.site-nav__link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
}

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

@media screen and (min-width: 48rem) {
  .site-header__menu-button {
    display: none;
  }

  .site-nav {
    display: block;
    position: static;
    width: auto;
    padding: 0;
    background: transparent;
    border-bottom: 0;
    box-shadow: none;
  }

  .site-nav__list {
    flex-direction: row;
    align-items: center;
    gap: 2rem;
  }
}

/* ─────────────────────────────────────────
   ボタン
───────────────────────────────────────── */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 3rem;
  padding-inline: 1.75rem;
  border: 1.5px solid transparent;
  border-radius: 9999px;
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  cursor: pointer;
}

.button--sm {
  min-height: 2.5rem;
  padding-inline: 1.25rem;
  font-size: 0.875rem;
}

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

.button--primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

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

.button--secondary:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.button--line {
  background: var(--color-line);
  color: var(--color-white);
  border-color: var(--color-line);
  font-size: 1rem;
  min-height: 3.5rem;
  padding-inline: 2.5rem;
}

.button--line:hover {
  background: #05b34a;
  border-color: #05b34a;
}

/* ─────────────────────────────────────────
   セクション共通
───────────────────────────────────────── */
.section {
  padding-block: 5rem;
}

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

.section__header {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 3rem;
}

.section__label {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.section__title {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-primary);
}

.section__text {
  color: var(--color-text-muted);
  max-width: 44rem;
  line-height: 1.9;
}

@media screen and (min-width: 48rem) {
  .section {
    padding-block: 6.25rem;
  }

  .section__title {
    font-size: 2.25rem;
  }
}

/* ─────────────────────────────────────────
   ヒーロー
───────────────────────────────────────── */
.hero {
  padding-block: 4rem 3rem;
  background: var(--color-bg);
}

.hero__inner {
  display: grid;
  gap: 3rem;
  align-items: center;
}

.hero__label {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.25rem;
}

.hero__title {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-primary);
  letter-spacing: 0.02em;
  margin-bottom: 1.25rem;
}

.hero__text {
  color: var(--color-text-muted);
  line-height: 1.9;
  margin-bottom: 2rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero__image {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 1rem;
}

@media screen and (min-width: 48rem) {
  .hero {
    padding-block: 6rem 5rem;
  }

  .hero__inner {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }

  .hero__title {
    font-size: 3rem;
  }
}

/* ─────────────────────────────────────────
   サービス
───────────────────────────────────────── */
.service-list {
  display: grid;
  gap: 1.5rem;
  list-style: none;
}

.service-card {
  padding: 2rem;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
}

.service-card__num {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.service-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.375rem;
}

.service-card__sub {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.service-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.8;
}

@media screen and (min-width: 48rem) {
  .service-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ─────────────────────────────────────────
   プラン
───────────────────────────────────────── */
.plan-list {
  display: grid;
  gap: 1.5rem;
  list-style: none;
}

.plan-card {
  position: relative;
  padding: 2rem;
  background: var(--color-white);
  border: 1.5px solid var(--color-border);
  border-radius: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

.plan-card__badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.875rem;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  border-radius: 9999px;
  width: fit-content;
}

.plan-card__name {
  font-size: 1.5rem;
  font-weight: 700;
}

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

.plan-card__catch {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.plan-card--featured .plan-card__catch {
  color: rgba(255, 255, 255, 0.75);
}

.plan-card__features {
  list-style: none;
  display: grid;
  gap: 0.5rem;
  font-size: 0.9375rem;
  padding-left: 0;
  flex: 1;
}

.plan-card__features li {
  padding-left: 1.25rem;
  position: relative;
}

.plan-card__features li::before {
  content: "–";
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

.plan-card--featured .plan-card__features li::before {
  color: rgba(255, 255, 255, 0.6);
}

@media screen and (min-width: 48rem) {
  .plan-list {
    grid-template-columns: repeat(3, 1fr);
    align-items: start;
  }
}

/* ─────────────────────────────────────────
   実績
───────────────────────────────────────── */
.works-list {
  display: grid;
  gap: 1.5rem;
  list-style: none;
}

.works-card {
  border-radius: 0.75rem;
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.works-card__image-wrap {
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.works-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.works-card:hover .works-card__image {
  transform: scale(1.04);
}

.works-card__body {
  padding: 1.25rem 1.5rem;
}

.works-card__category {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 0.375rem;
}

.works-card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
}

@media screen and (min-width: 48rem) {
  .works-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ─────────────────────────────────────────
   ブログ
───────────────────────────────────────── */
.blog-list {
  display: grid;
  gap: 0;
  list-style: none;
  border-top: 1px solid var(--color-border);
}

.blog-card {
  display: grid;
  gap: 0.5rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border);
}

.blog-card__date {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: 0.05em;
}

.blog-card__title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.6;
}

.blog-card:hover .blog-card__title {
  color: var(--color-primary);
}

@media screen and (min-width: 48rem) {
  .blog-card {
    grid-template-columns: 7rem 1fr;
    align-items: center;
    gap: 1.5rem;
  }
}

/* ─────────────────────────────────────────
   About
───────────────────────────────────────── */
.about__inner {
  display: grid;
  gap: 3rem;
  align-items: center;
}

.about__image-wrap {
  position: relative;
}

.about__image {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 1rem;
}

.about__image-note {
  margin-top: 0.5rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-align: center;
}

.about__text {
  color: var(--color-text-muted);
  line-height: 2;
  margin-bottom: 1rem;
}

.about__text:last-child {
  margin-bottom: 0;
}

@media screen and (min-width: 48rem) {
  .about__inner {
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
  }
}

/* ─────────────────────────────────────────
   FAQ
───────────────────────────────────────── */
.faq-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-border);
}

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

.faq-item__button {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 0;
  background: transparent;
  border: none;
  text-align: left;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-primary);
  cursor: pointer;
  line-height: 1.6;
  font-family: var(--font-sans);
}

.faq-item__icon {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  border: 1.5px solid var(--color-primary);
  position: relative;
  transition: background 0.2s ease;
}

.faq-item__icon::before,
.faq-item__icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0.625rem;
  height: 1.5px;
  background: var(--color-primary);
  transform: translate(-50%, -50%);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.faq-item__icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.faq-item__button[aria-expanded="true"] .faq-item__icon {
  background: var(--color-primary);
}

.faq-item__button[aria-expanded="true"] .faq-item__icon::before,
.faq-item__button[aria-expanded="true"] .faq-item__icon::after {
  background: var(--color-white);
}

.faq-item__button[aria-expanded="true"] .faq-item__icon::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

.faq-item__a {
  display: none;
  padding-bottom: 1.5rem;
}

.faq-item__a.is-open {
  display: block;
}

.faq-item__a p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.9;
}

/* ─────────────────────────────────────────
   コンタクト
───────────────────────────────────────── */
.contact-line {
  display: flex;
  justify-content: center;
  margin-bottom: 2.5rem;
}

.contact-divider {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.contact-divider::before,
.contact-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* フォーム */
.contact-form {
  max-width: 40rem;
  margin-inline: auto;
  display: grid;
  gap: 1.5rem;
}

.form-group {
  display: grid;
  gap: 0.5rem;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-required {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  background: #dc2626;
  color: #fff;
  font-size: 0.6875rem;
  font-weight: 700;
  border-radius: 9999px;
}

.form-note {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-top: -0.25rem;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: 0.5rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-white);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  appearance: none;
  box-sizing: border-box;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(27, 42, 74, 0.1);
}

.form-select-wrap {
  position: relative;
}

.form-select-wrap::after {
  content: "";
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  width: 0.5rem;
  height: 0.5rem;
  border-right: 2px solid var(--color-text-muted);
  border-bottom: 2px solid var(--color-text-muted);
  rotate: 45deg;
  margin-top: -0.125rem;
  pointer-events: none;
}

.form-textarea {
  resize: vertical;
  min-height: 9rem;
}

.form-submit {
  display: flex;
  justify-content: center;
  margin-top: 0.5rem;
}

.form-submit .button {
  min-width: 12rem;
}

/* ─────────────────────────────────────────
   フッター
───────────────────────────────────────── */
.site-footer {
  padding-block: 2rem;
  background: var(--color-dark);
  color: var(--color-white);
}

.site-footer__inner {
  display: grid;
  gap: 0.75rem;
}

.site-footer__logo {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.site-footer__copy {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.8125rem;
}

@media screen and (min-width: 48rem) {
  .site-footer__inner {
    grid-template-columns: auto auto;
    align-items: center;
    justify-content: space-between;
  }
}

/* ─────────────────────────────────────────
   アクセシビリティ
───────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .button,
  .works-card__image,
  .hamburger span {
    transition: none;
  }
}