/* ============================================================
   WIDE Space Working Group — site styles
   ============================================================ */

/* ========== Reset & Base ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg: #ffffff;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-heading: #1a3a5c;
  --color-accent: #3a7bd5;
  --color-hero-bg: #0d1b2a;
  --color-hero-text: #e0e8f0;
  --color-border: #dee2e6;
  --color-section-alt: #f8f9fa;
  --color-card-bg: #ffffff;
  --color-nav-bg: #1a3a5c;
  --color-th-bg: #1a3a5c;
  --color-th-text: #ffffff;
  --color-hover: #f0f4f8;
  --color-footer-bg: #1a1a2e;
  --color-footer-text: #a0a0b0;
  --shadow-card: 0 2px 8px rgba(0,0,0,0.08);

  --font-body: 'Source Sans 3', 'Noto Sans JP', sans-serif;
  --max-width: 960px;
  --nav-height: 56px;
}

html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  font-size: 15px;
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* ========== Navbar ========== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: var(--color-nav-bg);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 1000;
  box-shadow: 0 1px 4px rgba(0,0,0,0.15);
}

.navbar-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  font-size: 16px;
  color: #fff;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.navbar-brand:hover { text-decoration: none; }

.brand-logo {
  height: 34px;
  width: 34px;
  display: block;
  /* blue logo needs a white plate to read on the navy navbar */
  background: #fff;
  border-radius: 50%;
  padding: 4px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.25);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.navbar-nav {
  display: flex;
  list-style: none;
  gap: 2px;
  align-items: center;
}

.navbar-nav a {
  color: rgba(255,255,255,0.85);
  font-size: 13px;
  padding: 6px 11px;
  border-radius: 4px;
  transition: background 0.2s, color 0.2s;
}
.navbar-nav a:hover {
  background: rgba(255,255,255,0.12);
  color: #fff;
  text-decoration: none;
}
.navbar-nav a.active {
  background: rgba(255,255,255,0.18);
  color: #fff;
}

/* Hamburger (mobile only) */
.menu-toggle {
  display: none;
  width: 34px;
  height: 32px;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 4px;
  background: transparent;
  color: #fff;
  font-size: 16px;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.2s, border-color 0.2s;
}
.menu-toggle:hover {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.6);
}

/* ========== Hero ========== */
.hero {
  position: relative;
  margin-top: var(--nav-height);
  background: #fff;
  color: var(--color-hero-bg);
  padding: 84px 24px 76px;
  text-align: center;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

/* Subtle starfield */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1.5px 1.5px at 20% 30%, rgba(255,255,255,0.8), transparent),
    radial-gradient(1.5px 1.5px at 75% 25%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1px 1px at 40% 70%, rgba(255,255,255,0.7), transparent),
    radial-gradient(1px 1px at 90% 60%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1.5px 1.5px at 60% 45%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1px 1px at 10% 80%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 85% 85%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1.5px 1.5px at 50% 15%, rgba(255,255,255,0.7), transparent);
  display: none; /* white stars are invisible on the white hero */
  opacity: 0.7;
  animation: twinkle 6s ease-in-out infinite alternate;
  pointer-events: none;
}
@keyframes twinkle {
  from { opacity: 0.4; }
  to   { opacity: 0.85; }
}

.hero > * { position: relative; z-index: 1; }

.hero-logo {
  width: 150px;
  height: 150px;
  margin: 0 auto 24px;
  display: block;
}

.hero h1 {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-hero-bg);
  margin-bottom: 12px;
  letter-spacing: 0.01em;
}

.hero .tagline {
  font-size: 16px;
  color: rgba(13,27,42,0.72);
  max-width: 600px;
  margin: 0 auto;
}

/* ========== Sections ========== */
.section {
  padding: 56px 24px;
  border-bottom: 1px solid var(--color-border);
}

.section:last-of-type { border-bottom: none; }

.section-alt { background: var(--color-section-alt); }

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

.section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 24px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.section p {
  margin-bottom: 16px;
  color: var(--color-text);
}

.section p.en {
  color: var(--color-text-light);
  font-size: 14px;
  margin-top: -8px;
}

.section ul {
  margin: 12px 0 16px 24px;
  line-height: 2;
}

.section li { margin-bottom: 4px; }
.section li small { color: var(--color-text-light); }

/* ========== Members Table ========== */
.members-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}

.members-table th,
.members-table td {
  text-align: left;
  padding: 10px 16px;
  border-bottom: 1px solid var(--color-border);
}

.members-table th {
  background: var(--color-th-bg);
  color: var(--color-th-text);
  font-weight: 600;
  font-size: 13px;
}

.members-table tr:hover td { background: var(--color-hover); }

.note {
  font-size: 13px;
  color: var(--color-text-light);
  margin-top: 12px;
}

/* ========== Publications ========== */
.pub-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: pub;
}

.pub-list li {
  counter-increment: pub;
  padding: 8px 0 8px 40px;
  position: relative;
  font-size: 14px;
  line-height: 1.7;
  border-bottom: 1px solid var(--color-border);
}

.pub-list li::before {
  content: "[" counter(pub) "]";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 600;
  font-size: 13px;
}

/* ========== Repo Cards ========== */
.repo-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 16px;
}

.repo-card {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 20px;
  background: var(--color-card-bg);
  transition: box-shadow 0.2s, transform 0.2s;
}
.repo-card:hover { box-shadow: var(--shadow-card); transform: translateY(-2px); }

.repo-card h3 {
  font-size: 16px;
  margin-bottom: 6px;
}
.repo-card h3 a { color: var(--color-heading); font-weight: 700; }

.repo-card p {
  font-size: 13.5px;
  color: var(--color-text);
  margin: 0 0 6px;
}
.repo-card p.en {
  color: var(--color-text-light);
  font-size: 12.5px;
  margin: 0 0 12px;
}

.repo-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 12px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--color-hover);
  border: 1px solid var(--color-border);
  font-weight: 600;
  font-size: 11.5px;
  color: var(--color-text);
}
.tag .dot { width: 9px; height: 9px; border-radius: 50%; }
.tag .dot.go { background: #00ADD8; }
.tag .dot.docker { background: #2496ED; }

.repo-more {
  margin-top: 18px;
  font-size: 13px;
}

/* ========== Links ========== */
.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.link-item {
  display: block;
  padding: 14px 18px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-heading);
  background: var(--color-card-bg);
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
}
.link-item:hover {
  background: var(--color-hover);
  border-color: var(--color-accent);
  text-decoration: none;
  transform: translateY(-2px);
}
.link-item small {
  display: block;
  font-weight: 400;
  color: var(--color-text-light);
  font-size: 12px;
  margin-top: 2px;
}

/* ========== Footer ========== */
.footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  text-align: center;
  padding: 32px 24px;
  font-size: 13px;
}
.footer a { color: var(--color-footer-text); }
.footer a:hover { color: #fff; }

/* ========== Back to top ========== */
.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--color-accent);
  color: #fff;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 2px 10px rgba(0,0,0,0.25);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s, transform 0.25s, visibility 0.25s;
  z-index: 900;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: #2a5a8c; }

/* ========== Scroll fade-in ========== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== Generic page (blog etc.) ========== */
.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 72px 24px 64px;
  min-height: calc(100vh - var(--nav-height) - 130px);
}
.page h1 {
  font-size: 26px;
  color: var(--color-heading);
  margin-bottom: 8px;
}
.page .lead { color: var(--color-text-light); margin-bottom: 28px; }

.post-list { list-style: none; padding: 0; margin: 0; }
.post-list li {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}
.post-list time { display: block; font-size: 12px; color: var(--color-text-light); }
.post-list a { font-weight: 600; font-size: 16px; }

.empty-state {
  border: 1px dashed var(--color-border);
  border-radius: 8px;
  padding: 40px 24px;
  text-align: center;
  color: var(--color-text-light);
}

/* ========== Responsive ========== */
@media (max-width: 860px) {
  .menu-toggle { display: inline-flex; }

  .navbar-nav {
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    background: var(--color-nav-bg);
    padding: 0 16px;
    max-height: 0;
    overflow: hidden;
    box-shadow: 0 6px 10px rgba(0,0,0,0.25);
    transition: max-height 0.3s ease, padding 0.3s ease;
  }
  .navbar-nav.open {
    max-height: 85vh;
    padding: 8px 16px 14px;
  }
  .navbar-nav a { display: block; padding: 10px 12px; font-size: 14px; }
}

@media (max-width: 768px) {
  .hero { padding: 56px 20px 48px; }
  .hero-logo { width: 116px; height: 116px; margin-bottom: 18px; }
  .hero h1 { font-size: 24px; }
  .section { padding: 40px 20px; }
  .members-table { font-size: 13px; }
  .members-table th, .members-table td { padding: 8px 10px; }
}

/* ========== Reduced motion ========== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .fade-in { opacity: 1; transform: none; }
}