/* ========================================
   痛みのデジタルヘルスサイエンス共同研究講座
   Main Stylesheet
   ======================================== */

:root {
  --color-primary: #003C71;
  --color-accent: #C8102E;
  --color-secondary: #005B9A;
  --color-light: #EEF3F9;
  --color-bg: #FAFAFA;
  --color-text: #1A1A1A;
  --color-text-muted: #5A5A6A;
  --color-border: #D0D8E4;
  --font-sans: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Meiryo', sans-serif;
  --shadow-sm: 0 1px 4px rgba(0,60,113,0.08);
  --shadow-md: 0 4px 16px rgba(0,60,113,0.12);
  --radius: 6px;
  --transition: 0.25s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
}

/* ---- Typography ---- */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.35; }
h2 { font-size: 1.75rem; color: var(--color-primary); }
h3 { font-size: 1.2rem; color: var(--color-primary); }
p { margin-bottom: 1em; }
a { color: var(--color-secondary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Layout ---- */
.container { max-width: 1080px; margin: 0 auto; padding: 0 1.5rem; }
section { padding: 4.5rem 0; }
section:nth-child(even) { background: var(--color-light); }

/* ---- Section Header ---- */
.section-header {
  text-align: center;
  margin-bottom: 3rem;
}
.section-header h2 { display: inline-block; position: relative; padding-bottom: 0.6rem; }
.section-header h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--color-accent);
  margin: 0.5rem auto 0;
  border-radius: 2px;
}
.section-header p { color: var(--color-text-muted); margin-top: 0.75rem; font-size: 0.95rem; }

/* ---- Navigation ---- */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  padding: 0 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}
.nav-brand {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.nav-brand .lab-name { font-size: 0.72rem; color: var(--color-text-muted); }
.nav-brand .short-name { font-size: 1rem; font-weight: 700; color: var(--color-primary); }
.nav-links { display: flex; gap: 0.25rem; list-style: none; }
.nav-links a {
  display: block;
  padding: 0.4rem 0.75rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius);
  transition: var(--transition);
}
.nav-links a:hover { background: var(--color-light); color: var(--color-primary); text-decoration: none; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 0.5rem; }
.nav-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--color-text); margin: 4px 0;
  transition: var(--transition);
}

/* ---- Hero ---- */
#hero {
  padding-top: 60px;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #002855 0%, #003C71 50%, #005B9A 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
}
#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-content { position: relative; z-index: 1; padding: 4rem 0; }
.hero-badge {
  display: inline-block;
  background: rgba(200,16,46,0.85);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.3rem 0.9rem;
  border-radius: 20px;
  margin-bottom: 1.5rem;
  letter-spacing: 0.05em;
}
#hero h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  color: #fff;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}
.hero-en {
  font-size: clamp(0.9rem, 1.8vw, 1.1rem);
  color: rgba(255,255,255,0.65);
  margin-bottom: 1.75rem;
  font-style: italic;
}
.hero-subtitle {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.85);
  max-width: 640px;
  margin-bottom: 2.5rem;
  line-height: 1.8;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}
.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: var(--radius);
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.9);
}
.hero-meta-item .icon { font-size: 1rem; }
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-accent);
  color: #fff;
  padding: 0.75rem 2rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  box-shadow: 0 4px 12px rgba(200,16,46,0.3);
}
.hero-cta:hover { background: #A00C24; text-decoration: none; transform: translateY(-1px); }

/* ---- Stats ---- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}
.stat-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}
.stat-number sup { font-size: 0.9rem; font-weight: 600; }
.stat-label { font-size: 0.85rem; color: var(--color-text-muted); line-height: 1.4; }

/* ---- Purpose ---- */
.purpose-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.purpose-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 2rem;
  border-left: 4px solid var(--color-primary);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.purpose-card:hover { box-shadow: var(--shadow-md); }
.purpose-card h3 { margin-bottom: 0.75rem; font-size: 1.05rem; }
.purpose-card p { font-size: 0.9rem; color: var(--color-text-muted); margin-bottom: 0; }

/* ---- Research Strengths ---- */
.strengths-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.strength-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  border-top: 3px solid var(--color-accent);
  transition: var(--transition);
}
.strength-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.strength-icon { font-size: 2rem; margin-bottom: 1rem; }
.strength-card h3 { font-size: 1rem; margin-bottom: 0.75rem; }
.strength-card p { font-size: 0.88rem; color: var(--color-text-muted); margin-bottom: 0; }

/* ---- Plan ---- */
.plan-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.25rem; }
.plan-item {
  display: flex;
  gap: 1rem;
  background: #fff;
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}
.plan-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}
.plan-item h3 { font-size: 0.95rem; margin-bottom: 0.4rem; }
.plan-item p { font-size: 0.85rem; color: var(--color-text-muted); margin-bottom: 0; }

/* ---- Members ---- */
.members-section .section-note {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.88rem;
  margin-top: -1.5rem;
  margin-bottom: 2.5rem;
}
.members-group { margin-bottom: 2.5rem; }
.members-group-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
  margin-bottom: 1.25rem;
}
.members-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1rem; }
.member-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
  border-left: 3px solid var(--color-border);
  transition: var(--transition);
}
.member-card:hover { border-left-color: var(--color-primary); box-shadow: var(--shadow-md); }
.member-name { font-weight: 700; font-size: 1rem; color: var(--color-primary); }
.member-name-en { font-size: 0.78rem; color: var(--color-text-muted); margin-top: 0.1rem; }
.member-role { font-size: 0.82rem; color: var(--color-text-muted); margin-top: 0.4rem; }
.member-desc { font-size: 0.82rem; color: var(--color-text-muted); margin-top: 0.5rem; border-top: 1px solid var(--color-border); padding-top: 0.5rem; }
.member-email { display: inline-block; font-size: 0.78rem; color: var(--color-secondary); margin-top: 0.4rem; }

/* ---- Partners ---- */
.partners-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 1.5rem; }
.partner-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.partner-card:hover { box-shadow: var(--shadow-md); }
.partner-tag {
  display: inline-block;
  background: var(--color-light);
  color: var(--color-primary);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 3px;
  margin-bottom: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.partner-card h3 { font-size: 1.05rem; margin-bottom: 1rem; }
.partner-info { font-size: 0.85rem; color: var(--color-text-muted); }
.partner-info dt { font-weight: 600; color: var(--color-text); display: inline; }
.partner-info dd { display: inline; margin-left: 0.25rem; }
.partner-info dl { margin-bottom: 0.35rem; }

/* ---- Data Flow ---- */
.dataflow-wrapper { overflow-x: auto; }
.dataflow {
  display: flex;
  align-items: stretch;
  gap: 0;
  min-width: 700px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.df-node {
  flex: 1;
  padding: 1.5rem 1rem;
  text-align: center;
  position: relative;
  background: var(--color-light);
  border-right: 1px solid var(--color-border);
}
.df-node:last-child { border-right: none; }
.df-node::after {
  content: '→';
  position: absolute;
  right: -12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  color: var(--color-primary);
  z-index: 1;
  background: var(--color-light);
  padding: 0 2px;
}
.df-node:last-child::after { display: none; }
.df-icon { font-size: 1.8rem; margin-bottom: 0.5rem; }
.df-label { font-size: 0.78rem; font-weight: 600; color: var(--color-primary); margin-bottom: 0.3rem; }
.df-sub { font-size: 0.72rem; color: var(--color-text-muted); line-height: 1.4; }
.df-node.highlight { background: var(--color-primary); }
.df-node.highlight .df-label { color: #fff; }
.df-node.highlight .df-sub { color: rgba(255,255,255,0.75); }
.df-node.highlight::after { background: var(--color-primary); color: #fff; }

/* ---- Contact ---- */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem; }
.contact-block h3 { font-size: 1rem; margin-bottom: 1rem; color: var(--color-primary); }
.contact-info { list-style: none; }
.contact-info li { display: flex; gap: 0.75rem; align-items: flex-start; padding: 0.5rem 0; border-bottom: 1px solid var(--color-border); font-size: 0.9rem; }
.contact-info li:last-child { border-bottom: none; }
.contact-info .ci-label { font-weight: 600; min-width: 60px; color: var(--color-text-muted); font-size: 0.8rem; }
.contact-info a { color: var(--color-secondary); }

/* ---- Footer ---- */
footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.8);
  padding: 2.5rem 0;
  font-size: 0.85rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.footer-brand .brand-main { font-size: 1rem; font-weight: 700; color: #fff; }
.footer-brand .brand-sub { font-size: 0.75rem; color: rgba(255,255,255,0.6); margin-top: 0.2rem; }
.footer-links { display: flex; gap: 1.5rem; list-style: none; }
.footer-links a { color: rgba(255,255,255,0.7); font-size: 0.82rem; }
.footer-links a:hover { color: #fff; text-decoration: none; }
.footer-copy { width: 100%; margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,0.15); color: rgba(255,255,255,0.45); font-size: 0.78rem; }

/* ---- Utility ---- */
.tag {
  display: inline-block;
  background: var(--color-light);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.6rem;
  border-radius: 20px;
  margin: 0.2rem;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  h2 { font-size: 1.4rem; }
  section { padding: 3rem 0; }
  .nav-links {
    display: none;
    position: absolute;
    top: 60px; left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    padding: 0.75rem;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .hero-meta { flex-direction: column; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}