:root {
  --ink: #1c2430; --sub: #64748b; --line: #e2e8f0; --bg: #f8fafc;
  --accent: #2563eb; --accent-bg: #eff6ff; --success: #16a34a;
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg); color: var(--ink);
}
header { background: #fff; border-bottom: 1px solid var(--line); padding: 20px 32px; }
.brand { display: flex; align-items: center; gap: 14px; }
.logo {
  width: 42px; height: 42px; border-radius: 8px; background: var(--accent);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 15px;
}
header h1 { margin: 0; font-size: 20px; }
.tagline { margin: 2px 0 0; color: var(--sub); font-size: 13px; }

.tabs {
  display: flex; gap: 4px; padding: 0 32px; background: #fff;
  border-bottom: 1px solid var(--line);
}
.tab {
  padding: 12px 16px; border: none; background: none; cursor: pointer;
  font-size: 14px; font-weight: 600; color: var(--sub);
  border-bottom: 2.5px solid transparent;
}
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }

main { max-width: 900px; margin: 0 auto; padding: 28px 32px; }
.view { display: none; }
.view.active { display: block; }

table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 8px; overflow: hidden; box-shadow: 0 1px 2px rgba(0,0,0,0.04); }
th, td { padding: 12px 14px; text-align: left; font-size: 14px; border-bottom: 1px solid var(--line); }
th { background: #f1f5f9; font-size: 12px; text-transform: uppercase; color: var(--sub); letter-spacing: 0.03em; }

.summary-controls { display: flex; gap: 10px; margin-bottom: 20px; }
.summary-controls select, .summary-controls button, #logForm input, #logForm button {
  padding: 9px 12px; border: 1px solid var(--line); border-radius: 6px; font-size: 14px;
}
.summary-controls button, #logForm button {
  background: var(--accent); color: #fff; border: none; font-weight: 600; cursor: pointer;
}

#summaryResult { background: #fff; border-radius: 8px; padding: 20px; box-shadow: 0 1px 2px rgba(0,0,0,0.04); }
#summaryResult .total { font-size: 28px; font-weight: 700; color: var(--accent); }
#summaryResult .row { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--line); font-size: 14px; }

#logForm { display: flex; gap: 10px; flex-wrap: wrap; background: #fff; padding: 20px; border-radius: 8px; box-shadow: 0 1px 2px rgba(0,0,0,0.04); }

footer { text-align: center; padding: 20px; color: var(--sub); font-size: 12px; }