/*
 * SunAuto Corporate Website Stylesheet
 *
 * TABLE OF CONTENTS
 * -----------------
 * 1.  Base Settings (変数, 基本スタイル)
 * 2.  Layout (l-*) (コンテナ, ヘッダー, フッターなど)
 * 3.  Components (c-*) (ボタン, カードなど再利用部品)
 * 4.  Pages (p-*) (各ページ固有のスタイル)
 * 5.  Utility (u-*) (汎用ヘルパークラス)
 * 6.  Animation (アニメーション関連)
 *
 */

/* =============================================
 * == 1. Base Settings
 * ========================================== */
:root {
  /* ▼ Color Palette */
  --color-base: #FFFFFF;
  --color-main: #192A56;
  --color-accent: #D4AF37;
  --color-background: #F8F9FA;
  --color-text-primary: #333333;
  --color-text-light: #FFFFFF;
  --color-border: #E0E0E0;

  /* ▼ Typography */
  --font-family-heading: 'Noto Serif JP', serif;
  --font-family-body: 'Noto Sans JP', sans-serif;
  /* 本文の基本サイズを可変に設定 (15px 〜 16px) */
  --font-size-base: clamp(0.9375rem, 0.89rem + 0.2vw, 1rem);
  --line-height-base: 1.7;

  /* ▼ Layout */
  --content-width: 1200px;
  --spacing-unit: 8px;
  --header-height-sp: 60px;
  --header-height-pc: 80px;

  /* ▼ Effects */
  --transition-duration: 0.3s;
}

html {
  font-size: 100%; /* 16px を 1rem の基準とする */
}

body {
  font-family: var(--font-family-body);
  color: var(--color-text-primary);
  line-height: var(--line-height-base);
  background-color: var(--color-base);
  font-size: var(--font-size-base); /* clamp()を適用 */
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition-duration);
}

a:hover {
  opacity: 0.7;
}

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

/* =============================================
 * == 2. Layout (l-*)
 * ========================================== */
.l-container {
  max-width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: calc(var(--spacing-unit) * 3); /* 24px */
  padding-right: calc(var(--spacing-unit) * 3); /* 24px */
}

.l-section {
  padding-top: calc(var(--spacing-unit) * 10); /* 80px */
  padding-bottom: calc(var(--spacing-unit) * 10); /* 80px */
}

/* --- Header --- */
.l-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height-sp);
  background-color: var(--color-main);
  color: var(--color-text-light);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  z-index: 1000;
}
.l-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 calc(var(--spacing-unit) * 2); /* 16px */
}
.l-header__logo {
  font-family: var(--font-family-heading);
  font-weight: 600;
  color: var(--color-text-light);
  /* (20px 〜 24px) */
  font-size: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
}
.l-header__nav {
  position: fixed;
  top: var(--header-height-sp);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--header-height-sp));
  background-color: var(--color-main);
  transform: translateX(100%);
  transition: transform var(--transition-duration) ease-in-out;
}
.l-header__nav.is-active {
  transform: translateX(0);
}
.l-header__nav-list {
  padding-top: calc(var(--spacing-unit) * 4);
}
.l-header__nav-item a {
  display: block;
  padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 3);
  font-size: 1.125rem; /* 18px (モバイル) */
  text-align: center;
  color: var(--color-text-light);
}
.l-header__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 24px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
}
.l-header__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text-light);
  transition: all var(--transition-duration);
}
.l-header__hamburger.is-active span:nth-of-type(1) { transform: translateY(11px) rotate(45deg); }
.l-header__hamburger.is-active span:nth-of-type(2) { opacity: 0; }
.l-header__hamburger.is-active span:nth-of-type(3) { transform: translateY(-11px) rotate(-45deg); }

/* --- Footer --- */
.l-footer {
  background-color: var(--color-main);
  color: var(--color-text-light);
  padding-top: calc(var(--spacing-unit) * 6);
}
.l-footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: calc(var(--spacing-unit) * 4);
  padding-bottom: calc(var(--spacing-unit) * 6);
  text-align: center;
}
.l-footer__logo {
  font-family: var(--font-family-heading);
  font-weight: 600;
  /* (20px 〜 24px) */
  font-size: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
}
.l-footer__address {
  /* (13px 〜 14px) */
  font-size: clamp(0.8125rem, 0.79rem + 0.1vw, 0.875rem);
  margin-top: var(--spacing-unit);
}
.l-footer__nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 4);
}
.l-footer__nav-item {
  /* (13px 〜 14px) */
  font-size: clamp(0.8125rem, 0.79rem + 0.1vw, 0.875rem);
}
.l-footer__copyright {
  background-color: rgba(0, 0, 0, 0.1);
  text-align: center;
  padding: calc(var(--spacing-unit) * 1.5) 0;
  font-size: 0.75rem; /* 12px (可読性のため固定) */
}

/* =============================================
 * == 3. Components (c-*)
 * ========================================== */
/* --- Button --- */
.c-button {
  display: inline-block;
  background-color: var(--color-main);
  color: var(--color-text-light);
  font-weight: 700;
  padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 5);
  border: 2px solid var(--color-main);
  border-radius: 4px;
  transition: all var(--transition-duration);
}
.c-button:hover {
  opacity: 1;
  background-color: var(--color-base);
  color: var(--color-main);
}
.c-button--outline {
  background-color: transparent;
  color: var(--color-text-light);
  border-color: var(--color-text-light);
}
.c-button--outline:hover {
  background-color: var(--color-text-light);
  color: var(--color-main);
}

/* --- Card --- */
.c-card {
  background-color: var(--color-base);
  box-shadow: 0 4px 15px rgba(0,0,0,0.05);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.c-card__image-wrapper {
  aspect-ratio: 16 / 10;
}
.c-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.c-card__body {
  padding: calc(var(--spacing-unit) * 3);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}
.c-card__title {
  font-family: var(--font-family-heading);
  margin-bottom: var(--spacing-unit);
  /* (20px 〜 22px) */
  font-size: clamp(1.25rem, 1.15rem + 0.5vw, 1.375rem);
}
.c-card__text {
  margin-bottom: calc(var(--spacing-unit) * 3);
  flex-grow: 1;
}
.c-card__button-wrapper {
  text-align: center;
}

/* --- CTA (Call To Action) --- */
.c-cta {
  background-color: var(--color-background);
  padding: calc(var(--spacing-unit) * 8) 0;
  text-align: center;
}
.c-cta__heading {
  font-family: var(--font-family-heading);
  font-weight: 600;
  color: var(--color-main);
  margin-bottom: var(--spacing-unit);
  /* (24px 〜 28px) */
  font-size: clamp(1.5rem, 1.3rem + 1vw, 1.75rem);
}
.c-cta__text {
  margin-bottom: calc(var(--spacing-unit) * 4);
}
.c-cta__button {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--color-accent);
  color: var(--color-main);
  padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 6);
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  transition: all var(--transition-duration);
  margin-bottom: calc(var(--spacing-unit) * 5);
}
.c-cta__button:hover {
  opacity: 1;
  transform: translateY(-4px);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.15);
}
.c-cta__button-number {
  font-weight: 700;
  letter-spacing: 1px;
  /* (28px 〜 32px) */
  font-size: clamp(1.75rem, 1.6rem + 0.75vw, 2rem);
}
.c-cta__button-hours {
  /* (13px 〜 14px) */
  font-size: clamp(0.8125rem, 0.79rem + 0.1vw, 0.875rem);
  margin-top: calc(var(--spacing-unit) * 0.5);
}
.c-cta__map-wrapper {
  max-width: 800px;
  margin: 0 auto;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}
.c-cta__map {
  width: 100%;
  height: 100%;
}

/* --- Media Section --- */
.c-media-section {
  display: flex;
  flex-direction: column;
}
.c-media-section__image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.c-media-section__body {
  padding: calc(var(--spacing-unit) * 5);
}
.c-media-section__title {
  font-family: var(--font-family-heading);
  margin-bottom: calc(var(--spacing-unit) * 2);
  /* (24px 〜 28px) */
  font-size: clamp(1.5rem, 1.3rem + 1vw, 1.75rem);
}
.c-media-section__text {
  margin-bottom: calc(var(--spacing-unit) * 4);
}

/* --- Page Header --- */
.c-page-header {
  background-color: var(--color-main);
  color: var(--color-text-light);
  padding-top: calc(var(--header-height-sp) + var(--spacing-unit) * 5);
  padding-bottom: calc(var(--spacing-unit) * 5);
  text-align: center;
}
.c-page-header__title {
  font-family: var(--font-family-heading);
  /* (32px 〜 40px) */
  font-size: clamp(2rem, 1.5rem + 2.5vw, 2.5rem);
}
.c-page-header__subtitle {
  letter-spacing: .1em;
  opacity: 0.8;
  margin-top: var(--spacing-unit);
  /* (13px 〜 14px) */
  font-size: clamp(0.8125rem, 0.79rem + 0.1vw, 0.875rem);
}

/* --- Section Title --- */
.c-section-title {
font-family: var(--font-family-heading);
  font-weight: 600;
  text-align: center;
  /* (線とコンテンツ間の余白) */
  margin-bottom: calc(var(--spacing-unit) * 4); /* ← 32px になっているか */
  font-size: clamp(2rem, 1.5rem + 2.5vw, 2.5rem);
  
  position: relative; /* ← ★これが最重要です★ */
  
  /* (テキストと線の間の余白) */
  padding-bottom: calc(var(--spacing-unit) * 3); /* ← 24px が追加されているか */
}
.c-section-title--light {
  color: var(--color-text-light);
}

/* --- Value Card --- */
.c-value-card {
  text-align: center;
}
.c-value-card__icon {
  margin: 0 auto 16px;
  width: 60px;
  height: 60px;
}
.c-value-card__title {
  font-family: var(--font-family-heading);
  margin-bottom: 16px;
  /* (20px 〜 22px) */
  font-size: clamp(1.25rem, 1.15rem + 0.5vw, 1.375rem);
}
.c-value-card__text {
  text-align: left;
  /* (14px 〜 15px) */
  font-size: clamp(0.875rem, 0.83rem + 0.2vw, 0.9375rem);
}

/* =============================================
 * == 4. Pages (p-*)
 * ========================================== */
/* --- Top Page --- */
.p-top-hero {
  height: calc(100vh - var(--header-height-sp));
  margin-top: var(--header-height-sp);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background-color: var(--color-main);
}
.p-top-hero__video {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  min-width: 100%;
  min-height: 100%;
  width: auto;
  height: auto;
  z-index: 1;
  object-fit: cover;
}
.p-top-hero__inner {
  position: relative;
  z-index: 3;
  text-align: center;
  color: var(--color-text-light);
}
.p-top-hero__title {
  font-family: var(--font-family-heading);
  font-weight: 600;
  letter-spacing: .1em;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
  /* (28px 〜 52px) */
  font-size: clamp(1.75rem, 8vw, 3.25rem);
}
.p-top-hero__subtitle {
  margin-top: var(--spacing-unit);
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.5);
  /* (14px 〜 18px) */
  font-size: clamp(0.875rem, 4.5vw, 1.125rem);
}
.p-top-service__grid {
  display: grid;
  gap: calc(var(--spacing-unit) * 4);
}
.p-top-philosophy {
  background-color: var(--color-main);
  color: var(--color-text-light);
  text-align: center;
}
.p-top-philosophy__lead {
  max-width: 800px;
  margin: 0 auto;
  line-height: 2;
  margin-bottom: calc(var(--spacing-unit) * 5);
}

/* --- Philosophy Page --- */
.p-philosophy-mission__title {
  font-family: var(--font-family-heading);
  margin-bottom: 32px;
  /* (32px 〜 40px) */
  font-size: clamp(2rem, 1.5rem + 2.5vw, 2.5rem);
}
.p-philosophy-mission__text {
  line-height: 2;
  max-width: 900px;
  margin: 0 auto;
}
.p-philosophy-values {
  background-color: var(--color-background);
}
.p-philosophy-values__grid {
  display: grid;
  gap: 40px;
}

/* --- Purchase Page --- */
.p-purchase-lead__title {
  font-family: var(--font-family-heading);
  margin-bottom: 32px;
  /* (32px 〜 40px) */
  font-size: clamp(2rem, 1.5rem + 2.5vw, 2.5rem);
}
.p-purchase-features {
  background-color: var(--color-background);
}
.p-purchase-flow {
  list-style: none;
  counter-reset: flow-counter;
  border-left: 2px solid var(--color-accent);
  margin-left: 24px;
}
.p-purchase-flow__item {
  position: relative;
  padding: 0 0 48px 48px;
}
.p-purchase-flow__item::before {
  content: counter(flow-counter);
  counter-increment: flow-counter;
  position: absolute;
  top: 0;
  left: -25px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: var(--color-main);
  font-weight: 700;
  font-size: 1.25rem; /* 20px */
}
.p-purchase-flow__item:last-child {
  padding-bottom: 0;
}
.p-purchase-flow__title {
  font-family: var(--font-family-heading);
  margin-bottom: 8px;
  /* (20px 〜 22px) */
  font-size: clamp(1.25rem, 1.15rem + 0.5vw, 1.375rem);
}
.p-purchase-flow__title span {
  display: block;
  font-family: var(--font-family-body);
  color: #888;
  /* (13px 〜 14px) */
  font-size: clamp(0.8125rem, 0.79rem + 0.1vw, 0.875rem);
}
.p-purchase-faq {
    background-color: var(--color-background);
}
.p-purchase-faq__list {
  max-width: 800px;
  margin: 0 auto;
}
.p-purchase-faq__item {
  border-bottom: 1px solid var(--color-border);
}
.p-purchase-faq__item:first-child {
  border-top: 1px solid var(--color-border);
}
.p-purchase-faq__question {
  position: relative;
  font-weight: 700;
  padding: 24px 48px 24px 0;
  cursor: pointer;
  /* (16px 〜 18px) */
  font-size: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
}
.p-purchase-faq__question::-webkit-details-marker {
  display: none;
}
.p-purchase-faq__question::after {
  content: '+';
  position: absolute;
  top: 50%;
  right: 8px;
  transform: translateY(-50%);
  font-size: 1.5rem; /* 24px */
  color: var(--color-main);
  transition: transform var(--transition-duration);
}
.p-purchase-faq__item[open] > .p-purchase-faq__question::after {
  transform: translateY(-50%) rotate(45deg);
}
.p-purchase-faq__answer {
  padding: 0 16px 24px;
  line-height: 1.8;
}

/* --- Reform Page --- */
.p-reform-lead__title {
  font-family: var(--font-family-heading);
  margin-bottom: 32px;
  /* (32px 〜 40px) */
  font-size: clamp(2rem, 1.5rem + 2.5vw, 2.5rem);
}
.p-reform-features {
  background-color: var(--color-background);
}
.p-reform-works__grid {
  display: grid;
  gap: 32px;
}

/* =============================================
 * == 5. Utility (u-*)
 * ========================================== */
.u-text-center {
  text-align: center;
}
.u-hidden-sp {
  display: none;
}
.u-margin-top-lg {
 margin-top: 64px;
}


/* =============================================
 * == 6. Animation
 * ========================================== */
.js-fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s, transform 0.8s;
}
.js-fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* =============================================
 * == Media Queries (for PC)
 * ========================================== */
@media (min-width: 768px) {
  /* --- Layout --- */
  .l-header { height: var(--header-height-pc); }
  .l-header__inner { padding: 0 calc(var(--spacing-unit) * 4); }
  .l-header__hamburger { display: none; }
  .l-header__nav {
    position: static;
    transform: none;
    height: auto;
    width: auto;
    background: transparent;
  }
  .l-header__nav-list {
    display: flex;
    gap: calc(var(--spacing-unit) * 4);
    padding-top: 0;
  }
  .l-header__nav-item a {
    padding: 0;
    font-size: 1rem; /* 16px (PC) - clamp対象外 */
  }
  .l-footer__inner { flex-direction: row; justify-content: space-between; text-align: left; }

  /* --- Components --- */
  .c-page-header {
    padding-top: calc(var(--header-height-pc) + var(--spacing-unit) * 8);
    padding-bottom: calc(var(--spacing-unit) * 8);
  }
  .c-media-section { flex-direction: row; align-items: center; }
  .c-media-section__image-wrapper, .c-media-section__body { width: 50%; }
  .c-media-section__body { padding: calc(var(--spacing-unit) * 8); }
  .c-media-section--reverse { flex-direction: row-reverse; }

  /* --- Pages --- */
  .p-top-hero {
    height: calc(100vh - var(--header-height-pc));
    margin-top: var(--header-height-pc);
  }
  .p-top-service__grid { grid-template-columns: repeat(2, 1fr); }
  
  .p-philosophy-values__grid { grid-template-columns: repeat(3, 1fr); gap: 32px; }

  .p-reform-works__grid { grid-template-columns: repeat(2, 1fr); }

  /* --- Utility --- */
  .u-hidden-sp { display: inline; }
}

@media (min-width: 992px) {
  /* --- Components --- */
  .c-media-section__body { padding: calc(var(--spacing-unit) * 10); }

  /* --- Pages --- */
  .p-philosophy-values__grid { gap: 60px; }
  .p-reform-works__grid { grid-template-columns: repeat(3, 1fr); }
}

.c-section-title::after {
  content: '';
  display: block;
  position: absolute;
  left: 50%;
  bottom: 0; /* padding-bottomの底辺に配置 */
  transform: translateX(-50%); /* 中央揃え */
  
  width: 70px;  /* 線の幅 */
  height: 2px; /* 線の太さ */
  
  /* currentColor が文字色（白/紺）を自動で参照します */
  background-color: currentColor;
}