:root {
  --bg: #f6f8fc;
  --text: #1f2937;
  --muted: #4b5563;
  --card: #ffffff;
  --line: #d1d5db;
  --accent: #1d4ed8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: radial-gradient(circle at top right, #e3edff 0%, var(--bg) 45%);
  color: var(--text);
}

.app {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px;
}

h1 {
  margin-top: 0;
}

.intro {
  color: var(--muted);
}

.controls {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.file-label {
  font-weight: 600;
}

button {
  border: 0;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  padding: 10px 14px;
  font-weight: 600;
  cursor: pointer;
}

button:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.summary,
.results {
  margin-top: 18px;
}

.debug-block {
  margin-top: 12px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}

.debug-title {
  margin: 0;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  background: #f3f4f6;
  font-size: 0.95rem;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

.email-row {
  grid-template-columns: 1fr;
  margin-bottom: 10px;
}

.full-width {
  grid-column: 1 / -1;
}

.stat {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
}

.day-block {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  margin-bottom: 12px;
  overflow: hidden;
}

.day-header {
  margin: 0;
  font-size: 1rem;
}

.day-header-row {
  padding: 10px 12px;
  background: #eef2ff;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.copy-day-button {
  padding: 6px 10px;
  font-size: 0.85rem;
  border-radius: 6px;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid #eef2f7;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-weight: 600;
}

.empty {
  background: #fff7ed;
  border: 1px solid #fdba74;
  padding: 12px;
  border-radius: 10px;
}

code {
  background: #eef2ff;
  padding: 2px 6px;
  border-radius: 6px;
}