@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Noto+Sans+JP:wght@400;500;700&display=swap');

:root {
  --bg: #0d0f14;
  --bg2: #13161e;
  --bg3: #1a1e28;
  --border: rgba(255,255,255,0.07);
  --border2: rgba(255,255,255,0.13);
  --accent: #00c896;
  --accent2: #00a87e;
  --red: #ff5c6a;
  --text: #e8eaf0;
  --text2: #8890a4;
  --text3: #555d72;
  --mono: 'DM Mono', monospace;
  --sans: 'Noto Sans JP', sans-serif;
  --radius: 12px;
  --radius-sm: 6px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

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

/* ── Header ── */
.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(13,15,20,0.95);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.logo {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.5px;
}
.logo span { color: var(--accent); }
.tagline {
  font-size: 12px;
  color: var(--text3);
  letter-spacing: 0.04em;
}

/* ── Ad ── */
.ad-wrap {
  max-width: 1000px;
  margin: 0 auto;
  padding: 12px 20px;
}

/* ── Main ── */
.main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}

/* ── Pair Tabs ── */
.pair-section { margin-bottom: 20px; }
.pair-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.pair-tab {
  font-family: var(--mono);
  font-size: 13px;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border2);
  background: var(--bg2);
  color: var(--text2);
  cursor: pointer;
  transition: all 0.18s;
  letter-spacing: 0.03em;
}
.pair-tab:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.pair-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #000;
  font-weight: 500;
}

/* ── Chart Section ── */
.chart-section {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
}
.chart-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}
.rate-display { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.rate-pair {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text3);
  letter-spacing: 0.05em;
}
.rate-value {
  font-family: var(--mono);
  font-size: 36px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -1px;
  line-height: 1;
}
.rate-change {
  font-family: var(--mono);
  font-size: 14px;
  padding: 3px 8px;
  border-radius: 4px;
}
.rate-change.up { background: rgba(0,200,150,0.15); color: var(--accent); }
.rate-change.down { background: rgba(255,92,106,0.12); color: var(--red); }

.period-tabs { display: flex; gap: 4px; }
.period-tab {
  font-family: var(--mono);
  font-size: 12px;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border2);
  background: transparent;
  color: var(--text2);
  cursor: pointer;
  transition: all 0.15s;
}
.period-tab:hover { border-color: var(--accent); color: var(--accent); }
.period-tab.active { border-color: var(--accent); color: var(--accent); background: rgba(0,200,150,0.08); }

.chart-wrap {
  position: relative;
  height: 320px;
}
canvas { width: 100% !important; height: 100% !important; }

/* Loading dots */
.chart-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--bg2);
  border-radius: var(--radius-sm);
}
.chart-loading.hidden { display: none; }
.loading-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 1.2s ease-in-out infinite;
}
.loading-dot:nth-child(2) { animation-delay: 0.2s; }
.loading-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes pulse {
  0%, 80%, 100% { opacity: 0.2; transform: scale(0.8); }
  40% { opacity: 1; transform: scale(1); }
}

.data-source {
  font-size: 11px;
  color: var(--text3);
  margin-top: 12px;
  text-align: right;
}

/* ── Rates Grid ── */
.rates-section { margin-bottom: 24px; }
.section-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--text2);
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}
.jpy-label { font-size: 12px; color: var(--text3); font-weight: 400; }

.rates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}
.rate-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  cursor: pointer;
  transition: border-color 0.18s, background 0.18s;
}
.rate-card:hover {
  border-color: var(--border2);
  background: var(--bg3);
}
.rate-card.active-card { border-color: var(--accent); }

.rate-card.skeleton {
  height: 82px;
  animation: shimmer 1.4s ease-in-out infinite;
  background: linear-gradient(90deg, var(--bg2) 25%, var(--bg3) 50%, var(--bg2) 75%);
  background-size: 200% 100%;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.card-pair {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text3);
  margin-bottom: 6px;
  letter-spacing: 0.05em;
}
.card-rate {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.5px;
}
.card-change {
  font-family: var(--mono);
  font-size: 11px;
  margin-top: 4px;
}
.card-change.up { color: var(--accent); }
.card-change.down { color: var(--red); }

.update-time {
  font-size: 11px;
  color: var(--text3);
  margin-top: 10px;
  text-align: right;
}

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 20px;
  text-align: center;
}
.footer-inner { max-width: 1000px; margin: 0 auto; }
.footer-logo {
  font-family: var(--mono);
  font-size: 18px;
  color: var(--text2);
  margin-bottom: 8px;
}
.footer-logo span { color: var(--accent); }
.footer-note {
  font-size: 11px;
  color: var(--text3);
  margin-bottom: 6px;
}
.footer-copy { font-size: 11px; color: var(--text3); }

/* ── Responsive ── */
@media (max-width: 600px) {
  .chart-wrap { height: 240px; }
  .rate-value { font-size: 28px; }
  .chart-section { padding: 16px; }
  .rates-grid { grid-template-columns: repeat(2, 1fr); }
}