:root {
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-border: #dde1e6;
  --color-text: #1a1d21;
  --color-text-muted: #5b6270;
  --color-primary: #1f6feb;
  --color-primary-text: #ffffff;
  --color-danger: #b3261e;
  --color-danger-bg: #fdecea;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
}

.site-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}
.site-header__brand a { font-weight: 700; text-decoration: none; color: var(--color-text); }
.site-header__nav { display: flex; gap: 1rem; flex: 1; }
.site-header__nav a, .site-header__user a { color: var(--color-primary); text-decoration: none; }
.site-header__user { display: flex; align-items: center; gap: 1rem; font-size: 0.9rem; color: var(--color-text-muted); }

.site-main { max-width: 1100px; margin: 0 auto; padding: 1.5rem; }

.site-footer {
  text-align: center;
  padding: 1rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }

.button, button {
  display: inline-block;
  background: var(--color-primary);
  color: var(--color-primary-text);
  border: none;
  border-radius: 6px;
  padding: 0.5rem 1rem;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
}
.button:hover, button:hover { opacity: 0.9; }

.data-table { width: 100%; border-collapse: collapse; background: var(--color-surface); }
.data-table th, .data-table td { text-align: left; padding: 0.6rem 0.8rem; border-bottom: 1px solid var(--color-border); }
.data-table a { color: var(--color-primary); text-decoration: none; }

.badge { padding: 0.15rem 0.55rem; border-radius: 999px; font-size: 0.78rem; background: #eef1f4; color: var(--color-text-muted); }
.badge--scheduled { background: #fff4ce; color: #7a5b00; }
.badge--completed { background: #d9f2e3; color: #135c2e; }
.badge--cancelled { background: var(--color-danger-bg); color: var(--color-danger); }
.badge--billed { background: #e3ebfb; color: #1f4faa; }
.badge--closed { background: #e6e6e6; color: #4a4a4a; }

.alert { padding: 0.75rem 1rem; border-radius: 6px; margin-bottom: 1rem; }
.alert--error { background: var(--color-danger-bg); color: var(--color-danger); }

.filter-bar { display: flex; gap: 0.75rem; margin-bottom: 1rem; }
.filter-bar input, .filter-bar select { padding: 0.5rem; border: 1px solid var(--color-border); border-radius: 6px; }

.form-grid { display: flex; flex-direction: column; gap: 0.35rem; max-width: 480px; }
.form-grid label { font-weight: 600; margin-top: 0.5rem; font-size: 0.9rem; }
.form-grid input, .form-grid select, .form-grid textarea {
  padding: 0.55rem; border: 1px solid var(--color-border); border-radius: 6px; font-size: 0.95rem;
}
.form-grid button { margin-top: 1rem; align-self: flex-start; }

.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.detail-grid dl { display: grid; grid-template-columns: auto 1fr; gap: 0.35rem 1rem; }
.detail-grid dt { color: var(--color-text-muted); }

.inline-form { display: flex; gap: 0.5rem; align-items: center; }

.timeline { list-style: none; padding: 0; }
.timeline li { padding: 0.4rem 0; border-bottom: 1px solid var(--color-border); font-size: 0.9rem; }

.auth-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: var(--color-bg); }
.auth-card { background: var(--color-surface); padding: 2rem; border-radius: 10px; width: 100%; max-width: 360px; box-shadow: 0 2px 12px rgba(0,0,0,0.06); }
.auth-card h1 { margin: 0 0 0.25rem; font-size: 1.4rem; }
.auth-card__subtitle { margin: 0 0 1.25rem; color: var(--color-text-muted); font-size: 0.9rem; }
.auth-card form { display: flex; flex-direction: column; gap: 0.35rem; }
.auth-card label { font-weight: 600; font-size: 0.85rem; margin-top: 0.5rem; }
.auth-card input { padding: 0.6rem; border: 1px solid var(--color-border); border-radius: 6px; }
.auth-card button { margin-top: 1rem; }

@media (max-width: 700px) {
  .detail-grid { grid-template-columns: 1fr; }
  .site-header { flex-wrap: wrap; }
}