/* ==============================
   リセット・基本設定
============================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary: #2d6a4f;
  --color-primary-dark: #1b4332;
  --color-primary-light: #52b788;
  --color-accent: #f77f00;
  --color-accent-light: #ffb347;
  --color-text: #1a1a2e;
  --color-text-sub: #555;
  --color-bg: #f8f9f4;
  --color-white: #fff;
  --color-easy: #52b788;
  --color-medium: #f4a261;
  --color-hard: #e63946;
  --font-main: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', sans-serif;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(0,0,0,0.10);
  --shadow-hover: 0 8px 30px rgba(0,0,0,0.18);
  --transition: 0.25s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
}

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

ul { list-style: none; }

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

.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ==============================
   ヘッダー
============================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-white);
  border-bottom: 1px solid #e0e8e2;
  box-shadow: 0 2px 8px rgba(0,0,0,0.07);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo a {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-primary-dark);
}

.logo-icon { font-size: 1.5rem; }

.global-nav ul {
  display: flex;
  gap: 28px;
  align-items: center;
}

.global-nav a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-text);
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.global-nav a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.nav-gear {
  background: var(--color-accent);
  color: var(--color-white) !important;
  padding: 6px 16px !important;
  border-radius: 20px;
  border-bottom: none !important;
  transition: background var(--transition) !important;
}

.nav-gear:hover {
  background: var(--color-accent-light) !important;
  border-bottom: none !important;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-primary-dark);
}

/* ==============================
   ヒーロー
============================== */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(135deg, #1b4332 0%, #2d6a4f 40%, #52b788 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 70% 30%, rgba(82,183,136,0.3) 0%, transparent 60%),
    radial-gradient(ellipse at 20% 80%, rgba(27,67,50,0.5) 0%, transparent 50%);
}

/* 山の形をCSS絵で表現 */
.hero-bg::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 45%;
  background: linear-gradient(to top, rgba(0,0,0,0.25), transparent);
  clip-path: polygon(0 100%, 12% 55%, 25% 70%, 40% 30%, 55% 60%, 68% 20%, 80% 55%, 92% 40%, 100% 65%, 100% 100%);
}

.hero-bg::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 30%;
  background: rgba(0,0,0,0.2);
  clip-path: polygon(0 100%, 0 80%, 15% 60%, 30% 75%, 45% 50%, 60% 68%, 75% 45%, 88% 62%, 100% 48%, 100% 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--color-white);
  max-width: 720px;
  padding: 0 20px;
}

.hero-sub {
  display: inline-block;
  background: rgba(255,255,255,0.18);
  border: 1px solid rgba(255,255,255,0.35);
  border-radius: 20px;
  padding: 4px 18px;
  font-size: 0.88rem;
  margin-bottom: 20px;
  letter-spacing: 0.06em;
}

.hero-title {
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 18px;
  text-shadow: 0 2px 12px rgba(0,0,0,0.3);
}

.hero-desc {
  font-size: 1rem;
  opacity: 0.9;
  margin-bottom: 32px;
}

.hero-search {
  display: flex;
  gap: 0;
  max-width: 480px;
  margin: 0 auto 20px;
  border-radius: 40px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.search-input {
  flex: 1;
  padding: 14px 22px;
  border: none;
  font-size: 0.95rem;
  font-family: var(--font-main);
  outline: none;
  color: var(--color-text);
}

.search-btn {
  background: var(--color-accent);
  color: white;
  border: none;
  padding: 14px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  font-family: var(--font-main);
  transition: background var(--transition);
}

.search-btn:hover { background: var(--color-accent-light); }

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  align-items: center;
  font-size: 0.85rem;
  opacity: 0.9;
}

.tag {
  background: rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.4);
  border-radius: 14px;
  padding: 3px 12px;
  transition: background var(--transition);
}

.tag:hover { background: rgba(255,255,255,0.35); }

.hero-scroll {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,0.7);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ==============================
   セクション共通
============================== */
section { padding: 80px 0; }

.section-title {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 10px;
  color: var(--color-primary-dark);
}

.section-title span {
  color: var(--color-accent);
}

.section-desc {
  text-align: center;
  color: var(--color-text-sub);
  margin-bottom: 48px;
  font-size: 0.95rem;
}

/* ==============================
   コースカード
============================== */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.course-card {
  background: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
}

.course-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.rank-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 3;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-accent);
  color: white;
  font-weight: 700;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.rank-1 .rank-badge { background: #FFD700; color: #333; }
.rank-2 .rank-badge { background: #C0C0C0; color: #333; }
.rank-3 .rank-badge { background: #CD7F32; }

.course-img {
  height: 180px;
  background: linear-gradient(135deg, #2d6a4f, #52b788);
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
}

.course-img-placeholder {
  font-size: 3.5rem;
  opacity: 0.8;
}

.course-info { padding: 20px; }

.course-meta {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.region-tag {
  background: #e8f4ee;
  color: var(--color-primary);
  font-size: 0.75rem;
  padding: 2px 10px;
  border-radius: 10px;
  font-weight: 500;
}

.difficulty {
  font-size: 0.75rem;
  padding: 2px 10px;
  border-radius: 10px;
  font-weight: 700;
}

.difficulty.easy  { background: #d8f3dc; color: #1b4332; }
.difficulty.medium { background: #fdebd0; color: #7a3b00; }
.difficulty.hard  { background: #fde8e9; color: #9d0208; }

.course-info h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  line-height: 1.4;
}

.course-info h3 a:hover { color: var(--color-primary); }

.course-desc {
  font-size: 0.85rem;
  color: var(--color-text-sub);
  margin-bottom: 12px;
  line-height: 1.6;
}

.course-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  font-size: 0.8rem;
  color: var(--color-text-sub);
  margin-bottom: 16px;
}

.btn-detail {
  display: inline-block;
  background: var(--color-primary);
  color: white;
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: background var(--transition);
}

.btn-detail:hover { background: var(--color-primary-dark); }

/* ==============================
   地域セクション
============================== */
.regions {
  background: linear-gradient(180deg, #f0f7f2 0%, #e8f4ee 100%);
}

.region-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.region-card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  border: 2px solid transparent;
}

.region-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-primary-light);
}

.region-emoji { font-size: 2.2rem; }

.region-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-primary-dark);
}

.region-count {
  font-size: 0.78rem;
  color: var(--color-text-sub);
}

/* ==============================
   難易度セクション
============================== */
.difficulty-section { background: var(--color-white); }

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

.diff-card {
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow);
}

.diff-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.diff-easy  { background: linear-gradient(135deg, #d8f3dc, #b7e4c7); }
.diff-medium { background: linear-gradient(135deg, #fdebd0, #f9c784); }
.diff-hard  { background: linear-gradient(135deg, #fde8e9, #f4a0a4); }

.diff-icon { font-size: 2rem; }

.diff-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.diff-card p {
  font-size: 0.9rem;
  color: var(--color-text-sub);
  line-height: 1.6;
}

.diff-example {
  font-size: 0.8rem;
  color: var(--color-text-sub);
  font-style: italic;
}

.diff-btn {
  display: inline-block;
  background: var(--color-primary-dark);
  color: white;
  padding: 8px 22px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-top: 4px;
  transition: background var(--transition);
}

.diff-card:hover .diff-btn { background: var(--color-primary); }

/* ==============================
   季節セクション
============================== */
.season-section {
  background: linear-gradient(180deg, #f0f7f2 0%, #f8f9f4 100%);
}

.season-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.season-card {
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.season-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.spring { background: linear-gradient(135deg, #fce4f0, #f8c8de); }
.summer { background: linear-gradient(135deg, #fff9c4, #ffe082); }
.autumn { background: linear-gradient(135deg, #ffe0b2, #ffb74d); }
.winter { background: linear-gradient(135deg, #e3f2fd, #bbdefb); }

.season-icon { font-size: 2.5rem; }

.season-card h3 {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-primary-dark);
}

.season-card p {
  font-size: 0.83rem;
  color: var(--color-text-sub);
  line-height: 1.6;
}

/* ==============================
   装備バナー
============================== */
.gear-banner {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  padding: 60px 0;
}

.gear-banner-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.gear-text { color: white; }

.gear-text h2 {
  font-size: clamp(1.2rem, 2.5vw, 1.7rem);
  margin-bottom: 12px;
}

.gear-text p {
  opacity: 0.85;
  margin-bottom: 24px;
  font-size: 0.95rem;
}

.btn-gear {
  display: inline-block;
  background: var(--color-accent);
  color: white;
  padding: 12px 28px;
  border-radius: 25px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: background var(--transition), transform var(--transition);
}

.btn-gear:hover {
  background: var(--color-accent-light);
  transform: translateX(4px);
}

.gear-icons {
  display: flex;
  gap: 16px;
  font-size: 3rem;
  opacity: 0.7;
  flex-shrink: 0;
}

/* ==============================
   最新記事
============================== */
.latest-articles { background: var(--color-white); }

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

.article-card {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  background: var(--color-bg);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.article-img-placeholder {
  height: 140px;
  background: linear-gradient(135deg, #e8f4ee, #b7e4c7);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
}

.article-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.article-tag {
  display: inline-block;
  background: #e8f4ee;
  color: var(--color-primary);
  font-size: 0.72rem;
  padding: 2px 10px;
  border-radius: 10px;
  font-weight: 600;
  width: fit-content;
}

.article-body h3 {
  font-size: 0.9rem;
  line-height: 1.5;
}

.article-body h3 a:hover { color: var(--color-primary); }

.article-body time {
  font-size: 0.75rem;
  color: var(--color-text-sub);
}

/* ==============================
   フッター
============================== */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.85);
  padding: 40px 0 24px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}

.footer-logo {
  font-size: 1.1rem;
  font-weight: 700;
}

.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: center;
}

.footer-nav a {
  font-size: 0.85rem;
  opacity: 0.8;
  transition: opacity var(--transition);
}

.footer-nav a:hover { opacity: 1; }

.footer-copy {
  font-size: 0.78rem;
  opacity: 0.55;
}

/* ==============================
   レスポンシブ
============================== */
@media (max-width: 1024px) {
  .region-grid { grid-template-columns: repeat(4, 1fr); }
  .difficulty-cards { grid-template-columns: repeat(3, 1fr); }
  .season-cards { grid-template-columns: repeat(2, 1fr); }
  .article-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .global-nav { display: none; }
  .nav-toggle { display: block; }

  .global-nav.open {
    display: flex;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: white;
    border-top: 1px solid #e0e8e2;
    padding: 20px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
  }

  .global-nav.open ul {
    flex-direction: column;
    width: 100%;
    gap: 16px;
  }

  .course-grid { grid-template-columns: 1fr; }
  .region-grid { grid-template-columns: repeat(2, 1fr); }
  .difficulty-cards { grid-template-columns: 1fr; }
  .season-cards { grid-template-columns: repeat(2, 1fr); }
  .article-grid { grid-template-columns: 1fr; }

  .gear-banner-inner { flex-direction: column; text-align: center; }
  .gear-icons { justify-content: center; }

  section { padding: 56px 0; }
}

@media (max-width: 480px) {
  .region-grid { grid-template-columns: repeat(2, 1fr); }
  .season-cards { grid-template-columns: 1fr; }
  .hero-title { font-size: 1.6rem; }
  .hero-search { flex-direction: column; border-radius: var(--radius); }
  .search-input { border-radius: var(--radius) var(--radius) 0 0; }
  .search-btn { border-radius: 0 0 var(--radius) var(--radius); text-align: center; }
}