/* ===================================================================
   熊本観光プロモーションLP - style.css
   コンセプト：何もしない贅沢／五感で感じる熊本リトリート旅
   デザイン方向性：直線的・余白広め・黒×ベージュ×深いグリーン
=================================================================== */

/* ---------- 1. リセット & 基本設定 ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* カラートークン */
  --color-ink: #1a1f1c;        /* 深い墨緑（ほぼ黒） */
  --color-ink-soft: #2a2f2b;   /* 墨緑のやわらかいバリエーション */
  --color-cream: #f5f1e8;      /* 阿蘇のベージュ（背景） */
  --color-cream-dark: #ece5d4; /* ベージュの濃淡 */
  --color-forest: #2d4a3e;     /* 深いグリーン（阿蘇の自然） */
  --color-forest-light: #3f5f50;
  --color-brass: #b89b6e;      /* 真鍮アクセント（少量使用） */
  --color-white: #ffffff;
  --color-text-on-dark: rgba(245, 241, 232, 0.86);
  --color-text-on-dark-soft: rgba(245, 241, 232, 0.6);

  /* タイポグラフィ */
  --font-display: 'Shippori Mincho', serif;
  --font-body: 'Noto Sans JP', sans-serif;
  --font-accent: 'Cormorant Garamond', serif;

  /* レイアウト */
  --max-width: 1280px;
  --gutter: clamp(24px, 6vw, 96px);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--color-ink);
  background-color: var(--color-cream);
  line-height: 1.9;
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.sp-only {
  display: none;
}

/* フォーカス可視化（アクセシビリティ） */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-brass);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- 共通セクション設定 ---------- */
section {
  position: relative;
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* 共通：アイブロウ（ラベル） */
[class$="__eyebrow"] {
  font-family: var(--font-accent);
  font-size: 13px;
  letter-spacing: 0.22em;
  font-weight: 500;
  text-transform: uppercase;
}

/* ===================================================================
   ヘッダー
=================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: transparent;
  transition: background-color 0.4s ease, padding 0.4s ease;
}

.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 22px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-header__logo {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--color-white);
  white-space: nowrap;
}

.site-header__nav {
  display: none;
  gap: 40px;
}

.site-header__nav a {
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--color-text-on-dark);
  position: relative;
  padding-bottom: 4px;
}

.site-header__nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-white);
  transition: width 0.3s ease;
}

.site-header__nav a:hover::after {
  width: 100%;
}

.site-header__cta {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--color-ink);
  background-color: var(--color-cream);
  padding: 10px 18px;
  border: 1px solid var(--color-cream);
  transition: background-color 0.3s ease, color 0.3s ease;
  white-space: nowrap;
}

.site-header__cta:hover {
  background-color: transparent;
  color: var(--color-white);
}

@media (min-width: 640px) {
  .site-header__logo {
    font-size: 16px;
    letter-spacing: 0.08em;
  }

  .site-header__cta {
    font-size: 12px;
    letter-spacing: 0.1em;
    padding: 12px 26px;
  }
}

@media (min-width: 980px) {
  .site-header__nav {
    display: flex;
  }
}

/* ===================================================================
   1. ファーストビュー（Hero）
=================================================================== */
.hero {
  height: 100vh;
  min-height: 640px;
  width: 100%;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* 推奨画像サイズ 1920×1080px */
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(26, 31, 28, 0.35) 0%,
    rgba(26, 31, 28, 0.15) 40%,
    rgba(26, 31, 28, 0.75) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter) 100px;
  color: var(--color-white);
}

.hero__eyebrow {
  color: var(--color-text-on-dark);
  margin-bottom: 24px;
  display: block;
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(32px, 5.4vw, 64px);
  line-height: 1.5;
  letter-spacing: 0.02em;
}

.hero__title-line {
  display: block;
}

.hero__title-line:first-child {
  white-space: nowrap;
}

.hero__lead {
  margin-top: 28px;
  font-size: clamp(14px, 1.6vw, 18px);
  font-weight: 300;
  letter-spacing: 0.04em;
  color: var(--color-text-on-dark);
}

.hero__scroll {
  position: absolute;
  right: var(--gutter);
  bottom: 36px;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.hero__scroll-text {
  font-family: var(--font-accent);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--color-text-on-dark-soft);
  writing-mode: vertical-rl;
}

.hero__scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(180deg, rgba(245, 241, 232, 0.7), transparent);
  animation: scrollLine 2.4s ease-in-out infinite;
}

@keyframes scrollLine {
  0% { transform: scaleY(0.3); transform-origin: top; opacity: 0.4; }
  50% { transform: scaleY(1); transform-origin: top; opacity: 1; }
  100% { transform: scaleY(0.3); transform-origin: top; opacity: 0.4; }
}

@media (max-width: 375px) {
  .hero__title {
    font-size: 30px;
    letter-spacing: 0;
  }
}

/* ===================================================================
   2. 導入コピー
=================================================================== */
.intro {
  background-color: var(--color-cream);
  padding: 140px 0;
}

.intro__inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 var(--gutter);
  text-align: center;
}

.intro__text {
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 30px);
  line-height: 1.8;
  color: var(--color-ink-soft);
}

.intro__text--main {
  margin-top: 18px;
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 600;
  color: var(--color-ink);
}

.intro__highlight {
  position: relative;
  z-index: 1;
}

.intro__highlight::after {
  content: "";
  position: absolute;
  left: -2px;
  right: -2px;
  bottom: 4px;
  height: 10px;
  background-color: var(--color-brass);
  opacity: 0.35;
  z-index: -1;
}

.intro__sub {
  margin-top: 40px;
  font-size: 15px;
  line-height: 2.1;
  color: var(--color-ink-soft);
  font-weight: 300;
}

/* ===================================================================
   3. 熊本旅が選ばれる理由
=================================================================== */
.reason {
  background-color: var(--color-white);
  padding: 120px 0 140px;
}

.reason__header {
  max-width: var(--max-width);
  margin: 0 auto 72px;
  padding: 0 var(--gutter);
  text-align: center;
}

.reason__eyebrow {
  color: var(--color-forest);
  display: block;
  margin-bottom: 18px;
}

.reason__title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.reason__grid {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 56px 40px;
}

.reason__card-image {
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  margin-bottom: 28px;
  /* 推奨画像サイズ 800×600px */
}

.reason__card-num {
  font-family: var(--font-accent);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--color-brass);
  margin-bottom: 14px;
}

.reason__card-title {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.6;
  margin-bottom: 16px;
}

.reason__card-text {
  font-size: 14px;
  line-height: 1.95;
  color: var(--color-ink-soft);
}

@media (min-width: 640px) {
  .reason__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1080px) {
  .reason__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===================================================================
   4. 五感で感じる熊本
=================================================================== */
.senses {
  background-color: var(--color-ink);
  color: var(--color-text-on-dark);
  padding: 130px 0;
}

.senses__header {
  max-width: var(--max-width);
  margin: 0 auto 90px;
  padding: 0 var(--gutter);
  text-align: center;
}

.senses__eyebrow {
  color: var(--color-brass);
  display: block;
  margin-bottom: 18px;
}

.senses__title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4.4vw, 44px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--color-white);
}

.senses__lead {
  margin-top: 28px;
  font-size: 14px;
  color: var(--color-text-on-dark-soft);
  line-height: 1.9;
}

.senses__list {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  flex-direction: column;
  gap: 100px;
}

.senses__item {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.senses__item-media {
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  /* 推奨画像サイズ 1200×750px */
}

.senses__item-tag {
  font-family: var(--font-accent);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--color-brass);
  margin-bottom: 18px;
}

.senses__item-title {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 600;
  color: var(--color-white);
  line-height: 1.6;
  margin-bottom: 18px;
}

.senses__item-desc {
  font-size: 14px;
  line-height: 2;
  color: var(--color-text-on-dark-soft);
  max-width: 460px;
}

@media (min-width: 860px) {
  .senses__item {
    flex-direction: row;
    align-items: center;
    gap: 64px;
  }

  .senses__item-media,
  .senses__item-text {
    flex: 1;
  }

  .senses__item--reverse {
    flex-direction: row-reverse;
  }
}

/* ===================================================================
   5. おすすめ観光スポット
=================================================================== */
.spots {
  background-color: var(--color-cream);
  padding: 130px 0;
}

.spots__header {
  max-width: var(--max-width);
  margin: 0 auto 72px;
  padding: 0 var(--gutter);
  text-align: center;
}

.spots__eyebrow {
  color: var(--color-forest);
  display: block;
  margin-bottom: 18px;
}

.spots__title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 600;
}

.spots__lead {
  margin-top: 22px;
  font-size: 14px;
  color: var(--color-ink-soft);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.9;
}

.spots__grid {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px 32px;
}

.spots__card-image {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  margin-bottom: 24px;
  /* 推奨画像サイズ：通常カード 900×675px／largeカード 1600×1000px */
}

.spots__card-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  background-color: var(--color-forest);
  color: var(--color-white);
  font-size: 11px;
  letter-spacing: 0.12em;
  padding: 7px 16px;
}

.spots__card-tag {
  font-family: var(--font-accent);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--color-brass);
  margin-bottom: 12px;
}

.spots__card-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 14px;
}

.spots__card-text {
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--color-ink-soft);
}

@media (min-width: 640px) {
  .spots__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .spots__card--large {
    grid-column: span 2;
  }

  .spots__card--large .spots__card-image {
    aspect-ratio: 16 / 8;
  }
}

@media (min-width: 1080px) {
  .spots__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .spots__card--large {
    grid-column: span 3;
  }
}

/* ===================================================================
   6. モデルコース
=================================================================== */
.course {
  background-color: var(--color-forest);
  color: var(--color-text-on-dark);
  padding: 130px 0;
}

.course__header {
  max-width: var(--max-width);
  margin: 0 auto 90px;
  padding: 0 var(--gutter);
  text-align: center;
}

.course__eyebrow {
  color: var(--color-brass);
  display: block;
  margin-bottom: 18px;
}

.course__title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 600;
  color: var(--color-white);
}

.course__lead {
  margin-top: 22px;
  font-size: 14px;
  color: var(--color-text-on-dark-soft);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.9;
}

.course__timeline {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  flex-direction: column;
  gap: 64px;
}

.course__day {
  border-top: 1px solid rgba(245, 241, 232, 0.2);
  padding-top: 40px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.course__day-label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 220px;
}

.course__day-num {
  font-family: var(--font-accent);
  font-size: 26px;
  letter-spacing: 0.06em;
  color: var(--color-brass);
}

.course__day-theme {
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--color-white);
}

.course__day-items {
  display: flex;
  flex-direction: column;
  gap: 26px;
}

.course__time-item {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 20px;
  align-items: baseline;
}

.course__time {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--color-brass);
}

.course__time-text {
  font-size: 14px;
  line-height: 1.9;
  color: var(--color-text-on-dark);
}

@media (min-width: 900px) {
  .course__day {
    flex-direction: row;
    gap: 64px;
  }
}

/* ===================================================================
   7. 雨の日・夜でも楽しめる熊本
=================================================================== */
.weather {
  display: flex;
  flex-direction: column;
  background-color: var(--color-white);
}

.weather__media {
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  /* 推奨画像サイズ 1200×900px */
}

.weather__content {
  padding: 100px var(--gutter);
}

.weather__eyebrow {
  color: var(--color-forest);
  display: block;
  margin-bottom: 18px;
}

.weather__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 600;
  line-height: 1.6;
  max-width: 560px;
}

.weather__lead {
  margin-top: 26px;
  font-size: 14px;
  line-height: 1.95;
  color: var(--color-ink-soft);
  max-width: 560px;
}

.weather__grid {
  margin-top: 56px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  max-width: 860px;
}

.weather__card {
  border-left: 2px solid var(--color-forest);
  padding-left: 22px;
}

.weather__card-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 10px;
}

.weather__card-text {
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--color-ink-soft);
}

@media (min-width: 640px) {
  .weather__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 980px) {
  .weather {
    flex-direction: row;
  }

  .weather__media {
    width: 45%;
    aspect-ratio: auto;
  }

  .weather__content {
    width: 55%;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
}

/* ===================================================================
   8. 旅行者の声
=================================================================== */
.voice {
  background-color: var(--color-cream-dark);
  padding: 130px 0;
}

.voice__header {
  max-width: var(--max-width);
  margin: 0 auto 72px;
  padding: 0 var(--gutter);
  text-align: center;
}

.voice__eyebrow {
  color: var(--color-forest);
  display: block;
  margin-bottom: 18px;
}

.voice__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 600;
}

.voice__list {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.voice__card {
  background-color: var(--color-white);
  padding: 44px 36px;
  border-top: 2px solid var(--color-brass);
}

.voice__text {
  font-size: 14.5px;
  line-height: 2.05;
  color: var(--color-ink-soft);
  font-weight: 300;
}

.voice__author {
  margin-top: 24px;
  font-family: var(--font-accent);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--color-brass);
}

@media (min-width: 980px) {
  .voice__list {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===================================================================
   9. CTA
=================================================================== */
.cta {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.cta__media {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.cta__media img {
  /* 推奨画像サイズ 1920×1200px */
}

.cta__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(26, 31, 28, 0.55) 0%,
    rgba(26, 31, 28, 0.7) 100%
  );
}

.cta__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 120px var(--gutter);
  color: var(--color-white);
}

.cta__eyebrow {
  color: var(--color-text-on-dark);
  display: block;
  margin-bottom: 24px;
}

.cta__title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4.6vw, 46px);
  font-weight: 600;
  line-height: 1.6;
}

.cta__lead {
  margin-top: 24px;
  font-size: 15px;
  color: var(--color-text-on-dark);
}

.cta__button {
  display: inline-block;
  margin-top: 48px;
  padding: 20px 56px;
  background-color: var(--color-cream);
  color: var(--color-ink);
  font-size: 14px;
  letter-spacing: 0.08em;
  border: 1px solid var(--color-cream);
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.cta__button:hover {
  background-color: transparent;
  color: var(--color-white);
  border-color: var(--color-white);
}

/* ===================================================================
   10. フッター
=================================================================== */
.site-footer {
  background-color: var(--color-ink);
  color: var(--color-text-on-dark-soft);
  padding: 64px 0 40px;
}

.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
  text-align: center;
}

.site-footer__logo {
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--color-white);
  letter-spacing: 0.06em;
}

.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 28px;
}

.site-footer__nav a {
  font-size: 12.5px;
  color: var(--color-text-on-dark-soft);
  transition: color 0.3s ease;
}

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

.site-footer__copy {
  font-size: 11px;
  letter-spacing: 0.04em;
  color: rgba(245, 241, 232, 0.35);
}

/* ===================================================================
   スマホ表示の文言調整（sp-only要素の表示切り替え）
=================================================================== */
@media (max-width: 639px) {
  .sp-only {
    display: inline;
  }
}

/* ===================================================================
   スクロールフェードイン（軽量なアニメーション）
=================================================================== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}

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