:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --bg: #f4f5f9;
  --card-bg: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --border: #e5e7eb;
  --success: #16a34a;
  --error: #dc2626;
  font-family: "Segoe UI", "Noto Sans Thai", -apple-system, sans-serif;
}

* { box-sizing: border-box; }

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

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px 60px;
}

/* ---------- Login ---------- */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.login-box {
  background: var(--card-bg);
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.08);
  width: 100%;
  max-width: 380px;
}
.login-box h1 { margin: 0 0 4px; font-size: 22px; }
.login-box .subtitle { color: var(--muted); margin: 0 0 20px; font-size: 14px; }
.login-box form { display: flex; flex-direction: column; gap: 6px; }
.login-box label { font-size: 13px; color: var(--muted); margin-top: 8px; }
.login-box input {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
}
.login-box button {
  margin-top: 18px;
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 12px;
  border-radius: 8px;
  font-size: 15px;
  cursor: pointer;
}
.login-box button:hover { background: var(--primary-dark); }

/* ---------- Layout ---------- */
.topbar {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 14px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand { font-weight: 700; font-size: 18px; color: var(--primary); }
.user-menu { font-size: 14px; color: var(--muted); }
.user-menu a { color: var(--primary); text-decoration: none; }

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
}
.card label, .container > label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.card input, .card select, .container select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 14px;
}
.hint { font-size: 12px; color: var(--muted); margin-top: -8px; }

.btn {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  margin-right: 8px;
  cursor: pointer;
}
.btn-primary { background: var(--primary); color: #fff; border: none; }
.btn-primary:hover { background: var(--primary-dark); }

.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; }
.alert-error { background: #fee2e2; color: var(--error); }
.alert-success { background: #dcfce7; color: var(--success); }

/* ---------- Tabs ---------- */
.tabs { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.tab-btn {
  padding: 10px 16px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
}
.tab-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

.range-switch { display: flex; gap: 6px; margin-bottom: 14px; }
.range-btn {
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: #fff;
  cursor: pointer;
  font-size: 13px;
}
.range-btn.active { background: var(--primary-dark); color: #fff; border-color: var(--primary-dark); }

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: 10px;
  overflow: hidden;
}
.data-table th, .data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  text-align: left;
}
.data-table th { background: #f9fafb; color: var(--muted); font-weight: 600; }

.inline-form { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.inline-form input, .inline-form select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
}
.inline-form input { flex: 1; min-width: 200px; }
.inline-form button {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  cursor: pointer;
}

.loading { color: var(--muted); font-size: 14px; padding: 10px 0; }