/* ===========================
   JHSI - Japan Health Support Institute
   モダン・クリーン スタイルシート
   =========================== */

/* --- CSS変数 --- */
:root {
  --color-primary: #1a4a6e;
  --color-primary-light: #2d6fa8;
  --color-accent: #3a9bd5;
  --color-dark: #111827;
  --color-text: #374151;
  --color-text-light: #6b7280;
  --color-bg: #ffffff;
  --color-bg-gray: #f8fafc;
  --color-border: #e5e7eb;

  --font-sans: 'Inter', 'Noto Sans JP', sans-serif;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  --radius: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);

  --transition: 0.25s ease;
  --header-height: 64px;
}

/* --- リセット --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* --- ユーティリティ --- */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}
.sp-only { display: none; }

/* ===========================
   ヘッダー
   =========================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow var(--transition);
}
.header.scrolled { box-shadow: var(--shadow-md); }

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}
.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  font-family: 'Inter', sans-serif;
}
.logo-sub {
  font-size: 0.65rem;
  color: var(--color-text-light);
  display: none;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}
.nav__link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  transition: color var(--transition);
  white-space: nowrap;
}
.nav__link:hover { color: var(--color-primary); }
.nav__link--cta {
  background: var(--color-primary);
  color: #fff;
  padding: 0.5rem 1.25rem;
  border-radius: 999px;
  transition: background var(--transition), transform var(--transition);
}
.nav__link--cta:hover {
  background: var(--color-primary-light);
  color: #fff;
  transform: translateY(-1px);
}
.nav__logout {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-light);
  padding: 0.25rem 0;
  cursor: pointer;
  transition: color var(--transition);
  border: none;
  background: none;
  font-family: inherit;
}
.nav__logout:hover { color: #dc2626; }

/* ハンバーガー */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  z-index: 1100;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-dark);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===========================
   ボタン
   =========================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 2rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.9375rem;
  transition: background var(--transition), color var(--transition), transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(26,74,110,0.25);
}
.btn--primary:hover { background: var(--color-primary-light); box-shadow: 0 6px 20px rgba(26,74,110,0.35); }
.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn--outline:hover { background: var(--color-primary); color: #fff; }
.btn--white {
  background: #fff;
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
}
.btn--white:hover { background: #f0f7ff; }
.btn--sm { padding: 0.5rem 1.25rem; font-size: 0.875rem; }
.btn--full { width: 100%; }

/* ===========================
   ヒーロー
   =========================== */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--header-height);
}
.hero__bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #eef4fb 0%, #f8fafc 50%, #e8f4ff 100%);
  z-index: -1;
}
.hero__bg::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60%;
  height: 80%;
  background: radial-gradient(ellipse, rgba(58,155,213,0.12) 0%, transparent 70%);
  border-radius: 50%;
}
.hero__bg::after {
  content: '';
  position: absolute;
  bottom: -10%;
  left: -5%;
  width: 50%;
  height: 60%;
  background: radial-gradient(ellipse, rgba(26,74,110,0.06) 0%, transparent 70%);
  border-radius: 50%;
}

.hero__content {
  padding: var(--space-xl) var(--space-md);
  max-width: 700px;
}
.hero__eyebrow {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}
.hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-dark);
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
}
.hero__desc {
  font-size: 1.0625rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}
.hero__actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0.5;
}
.hero__scroll span { font-size: 0.6875rem; letter-spacing: 0.15em; text-transform: uppercase; }
.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-primary), transparent);
  animation: scrollLine 1.8s ease-in-out infinite;
}
@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ===========================
   セクション共通
   =========================== */
.section {
  padding: var(--space-2xl) 0;
}
.section--gray { background: var(--color-bg-gray); }
.section--dark {
  background: var(--color-primary);
  color: #fff;
}

.section__header {
  margin-bottom: var(--space-xl);
  text-align: center;
}
.section__header--light .section__label { color: rgba(255,255,255,0.6); }
.section__header--light .section__title { color: #fff; }

.section__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}
.section__title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  color: var(--color-dark);
  letter-spacing: -0.01em;
}

/* ===========================
   Aboutセクション
   =========================== */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}
.about__lead {
  font-size: 1.0625rem;
  color: var(--color-text);
  line-height: 1.9;
  margin-bottom: var(--space-lg);
}
.about__list { display: flex; flex-direction: column; gap: var(--space-md); }
.about__item {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}
.about__item-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: 'Inter', sans-serif;
}
.about__item-body h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 4px;
}
.about__item-body p {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

.about__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.about__visual-inner {
  width: 100%;
  max-width: 380px;
  aspect-ratio: 1;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
}
.about__stat {
  text-align: center;
  color: #fff;
}
.stat-num {
  display: block;
  font-size: 3.5rem;
  font-weight: 800;
  font-family: 'Inter', sans-serif;
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 0.5rem;
}
.stat-label {
  display: block;
  font-size: 0.875rem;
  opacity: 0.85;
  letter-spacing: 0.05em;
}

/* ===========================
   イベントセクション
   =========================== */
.events__grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-lg);
  align-items: start;
}
.event-card {
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.event-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.event-card--featured { border-top: 4px solid var(--color-primary); }
.event-card__badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin: var(--space-md) var(--space-md) 0;
  border-radius: 4px;
}
.event-card__body { padding: var(--space-md); }
.event-card__date {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  margin-bottom: 0.5rem;
  font-family: 'Inter', sans-serif;
}
.event-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: var(--space-sm);
}
.event-card__desc {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
  line-height: 1.7;
}

.events__sns {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}
.events__sns-text {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.sns-links { display: flex; flex-direction: column; gap: var(--space-sm); }
.sns-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0.625rem 1rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  transition: transform var(--transition), opacity var(--transition);
  color: #fff;
}
.sns-link:hover { transform: translateX(4px); opacity: 0.9; }
.sns-link svg { width: 18px; height: 18px; flex-shrink: 0; }
.sns-link--instagram { background: linear-gradient(45deg, #f09433, #e6683c, #dc2743, #cc2366, #bc1888); }
.sns-link--x { background: #000; }
.sns-link--tiktok { background: linear-gradient(45deg, #010101, #333); }

/* ===========================
   イベントシリーズ
   =========================== */
.event-series {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: var(--space-md) 0;
}
.event-series__item {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 12px;
  border-radius: var(--radius);
  background: var(--color-bg-gray);
  border-left: 3px solid var(--color-border);
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
  text-decoration: none;
  color: inherit;
}
.event-series__item:hover {
  background: #e8f0fb;
  box-shadow: var(--shadow-sm);
  transform: translateX(3px);
}
.event-series__item--done {
  background: #f0f7ff;
  border-left-color: var(--color-text-light);
  opacity: 0.75;
}
.event-series__item--done:hover { background: #e4eef9; }
.event-series__item--next {
  background: #eef9f0;
  border-left-color: #22c55e;
}
.event-series__item--next:hover { background: #e0f5e6; }
.event-series__arrow {
  flex-shrink: 0;
  margin-left: auto;
  font-size: 1.1rem;
  color: var(--color-text-light);
  transition: transform var(--transition), color var(--transition);
}
.event-series__item:hover .event-series__arrow {
  transform: translateX(3px);
  color: var(--color-primary);
}
.event-series__num {
  flex-shrink: 0;
  font-size: 0.7rem;
  font-weight: 700;
  background: var(--color-primary);
  color: #fff;
  padding: 2px 8px;
  border-radius: 999px;
  white-space: nowrap;
  margin-top: 2px;
}
.event-series__item--done .event-series__num { background: var(--color-text-light); }
.event-series__item--next .event-series__num { background: #16a34a; }
.event-series__info { display: flex; flex-direction: column; gap: 3px; }
.event-series__theme {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-dark);
  line-height: 1.4;
}
.event-series__date {
  font-size: 0.775rem;
  color: var(--color-text-light);
  font-family: 'Inter', sans-serif;
}
.event-series__speaker {
  font-size: 0.775rem;
  color: var(--color-text-light);
}
.event-card__meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: var(--space-sm);
}
.event-meta-tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--color-bg-gray);
  color: var(--color-text-light);
  border: 1px solid var(--color-border);
}

/* ===========================
   過去のイベント
   =========================== */
.archive__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}
.archive-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
}
.archive-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.archive-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}
.archive-card__year {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  font-family: 'Inter', sans-serif;
}
.archive-card__tag {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--color-bg-gray);
  color: var(--color-text-light);
  border: 1px solid var(--color-border);
}
.archive-card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 0.4rem;
  line-height: 1.45;
}
.archive-card__date {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  font-family: 'Inter', sans-serif;
  margin-bottom: 0.75rem;
}
.archive-card__desc {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0.75rem;
}
.archive-card__speakers { margin-bottom: 0.75rem; }
.archive-card__speakers-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-light);
  margin-bottom: 4px;
}
.archive-card__speakers ul { display: flex; flex-direction: column; gap: 2px; }
.archive-card__speakers li {
  font-size: 0.875rem;
  color: var(--color-text);
}
.archive-card__tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border);
}
.archive-card__tags span {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 999px;
  background: #f0f7ff;
  color: var(--color-primary);
  border: 1px solid rgba(26,74,110,0.15);
}

/* ===========================
   会員限定
   =========================== */
.members__content {
  text-align: center;
}
.members__desc {
  font-size: 1.125rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: var(--space-lg);
  line-height: 1.8;
}

/* ===========================
   入会案内
   =========================== */
.join__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}
.join__lead {
  font-size: 1.0625rem;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}
.join__benefits {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.join__benefits li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9375rem;
}
.join__benefit-icon {
  width: 24px;
  height: 24px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}
.join__cta-card {
  background: var(--color-bg-gray);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}
.join__cta-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: var(--space-sm);
}
.join__cta-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
  line-height: 1.7;
}

/* ===========================
   フッター
   =========================== */
.footer {
  background: var(--color-dark);
  color: rgba(255,255,255,0.7);
  padding: var(--space-xl) 0 var(--space-lg);
}
.footer__inner {
  display: grid;
  grid-template-areas:
    "brand nav sns"
    "copy copy copy";
  grid-template-columns: 1fr auto auto;
  gap: var(--space-md) var(--space-xl);
  align-items: center;
}
.footer__brand {
  grid-area: brand;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.footer__brand .logo-text { color: #fff; }
.footer__brand .logo-sub { display: block; font-size: 0.7rem; color: rgba(255,255,255,0.5); }
.footer__nav {
  grid-area: nav;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}
.footer__nav a {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}
.footer__nav a:hover { color: #fff; }
.footer__sns {
  grid-area: sns;
  display: flex;
  gap: var(--space-sm);
}
.footer__sns a {
  color: rgba(255,255,255,0.5);
  transition: color var(--transition);
}
.footer__sns a:hover { color: #fff; }
.footer__copy {
  grid-area: copy;
  font-size: 0.75rem;
  text-align: center;
  color: rgba(255,255,255,0.35);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255,255,255,0.08);
}

/* ===========================
   レスポンシブ（タブレット：768px）
   =========================== */
@media (max-width: 960px) {
  .about__grid { grid-template-columns: 1fr; }
  .about__visual { display: none; }
  .events__grid { grid-template-columns: 1fr; }
  .archive__grid { grid-template-columns: 1fr 1fr; }
  .join__grid { grid-template-columns: 1fr; }

  .footer__inner {
    grid-template-areas:
      "brand brand"
      "nav nav"
      "sns sns"
      "copy copy";
    grid-template-columns: 1fr 1fr;
  }
  .footer__nav { justify-content: flex-start; }
}

/* ===========================
   レスポンシブ（スマホ：640px）
   =========================== */
@media (max-width: 640px) {
  :root { --header-height: 56px; }
  .sp-only { display: block; }

  /* ナビ */
  .hamburger { display: flex; }
  .nav {
    position: fixed;
    inset: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
    z-index: 1050;
  }
  .nav.open { opacity: 1; pointer-events: auto; }
  .nav__list {
    flex-direction: column;
    gap: var(--space-lg);
    text-align: center;
  }
  .nav__link { font-size: 1.25rem; }
  .nav__link--cta { padding: 0.75rem 2rem; }

  /* ロゴ */
  .logo-text { font-size: 1.25rem; }

  /* ヒーロー */
  .hero__content { padding: var(--space-lg) var(--space-sm); }
  .hero__title { font-size: 1.875rem; }
  .hero__desc { font-size: 0.9375rem; }
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; }
  .hero__scroll { display: none; }

  /* セクション */
  .section { padding: var(--space-xl) 0; }
  .section__header { margin-bottom: var(--space-lg); }

  /* About */
  .about__list { gap: var(--space-sm); }

  /* イベント */
  .sns-links { flex-direction: row; flex-wrap: wrap; }
  .sns-link { flex: 1; min-width: 100px; justify-content: center; }

  /* アーカイブ */
  .archive__grid { grid-template-columns: 1fr; }
  .event-series__item { flex-wrap: wrap; }

  /* フッター */
  .footer__inner {
    grid-template-areas:
      "brand"
      "nav"
      "sns"
      "copy";
    grid-template-columns: 1fr;
    text-align: center;
  }
  .footer__nav { justify-content: center; gap: var(--space-sm); }
  .footer__sns { justify-content: center; }

  /* ボタン */
  .btn { padding: 0.75rem 1.5rem; font-size: 0.875rem; }
}

/* ===========================
   スクロールアニメーション
   =========================== */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-up:nth-child(2) { transition-delay: 0.1s; }
.fade-up:nth-child(3) { transition-delay: 0.2s; }
.fade-up:nth-child(4) { transition-delay: 0.3s; }