:root {
  --primary-color: #2c3e50;
  --secondary-color: #34495e;
  --accent-color: #3498db;
  --success-color: #2ecc71;
  --danger-color: #e74c3c;
  --bg-color: #f5f6fa;
  --text-color: #2c3e50;
  --border-color: #dcdde1;
  --card-bg: #ffffff;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}

header {
  background-color: var(--primary-color);
  color: white;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h1, h2, h3 {
  margin-bottom: 1rem;
}

.hidden {
  display: none !important;
}

main {
  max-width: 1600px;
  margin: 2rem auto;
  padding: 0 1rem;
}

section {
  background-color: var(--card-bg);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

#login-section {
  max-width: 420px;
  margin: 5rem auto;
  text-align: center;
}

#login-section h2 {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
  text-align: left;
}

label {
  display: block;
  margin-bottom: 0.4rem;
  font-weight: 600;
  color: var(--secondary-color);
  font-size: 0.9rem;
}

input[type="text"],
input[type="password"],
select,
textarea {
  width: 100%;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-family: inherit;
  margin-bottom: 0.25rem;
  font-size: 0.95rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="text"]:focus,
input[type="password"]:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.15);
}

.login-btn {
  width: 100%;
  padding: 0.8rem;
  font-size: 1rem;
  margin-top: 0.5rem;
}

button {
  background-color: var(--accent-color);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  cursor: pointer;
  font-weight: 600;
  transition: background-color 0.2s, transform 0.1s;
}

button:hover {
  background-color: #2980b9;
}

button:active {
  transform: scale(0.98);
}

#logout-btn {
  background-color: transparent;
  border: 1px solid white;
  margin-left: 1rem;
  padding: 0.4rem 1rem;
}

#logout-btn:hover {
  background-color: rgba(255,255,255,0.1);
}

.error-msg {
  color: var(--danger-color);
  margin-top: 1rem;
  font-size: 0.9rem;
}

/* Tabs */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
  gap: 0.5rem;
}

.tab-btn {
  background-color: transparent;
  color: var(--text-color);
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 4px 4px 0 0;
  padding: 0.75rem 1.5rem;
}

.tab-btn.active {
  background-color: var(--card-bg);
  border-color: var(--border-color);
  border-bottom-color: var(--card-bg);
  margin-bottom: -1px;
  color: var(--accent-color);
}

.tab-btn:hover:not(.active) {
  background-color: var(--bg-color);
}

.tab-pane {
  display: none;
  margin-top: 1rem;
}

.tab-pane.active {
  display: block;
}

#planner-table-manager.active {
  display: flex;
  gap: 1rem;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  margin-bottom: 2rem;
  table-layout: fixed; /* 讓表格寬度不受內容長度影響，改為均分 */
}

th, td {
  padding: 0.75rem;
  text-align: left;
  border: 1px solid var(--border-color); /* 將只有下方邊框改為四邊都有 */
  word-break: break-all; /* 強制長字串（如 ID 或權杖）換行，避免跑版 */
}

th {
  background-color: #e9ecef; /* 使用一個比 bg-color 稍深的顏色 */
  font-weight: 700; /* 讓標題文字更粗 */
  color: var(--primary-color);
}

/* Forms in tabs */
form {
  margin-bottom: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: flex-start;
}

form.vertical-form {
  flex-direction: column;
  max-width: 600px;
}

form.vertical-form .form-group {
  width: 100%;
}

form > input, form > select {
  flex: 1;
  min-width: 200px;
}

/* Planner */
.planner-controls {
  margin-bottom: 1.5rem;
  display: flex;
  gap: 1rem;
  align-items: center;
}

.planner-controls select {
  max-width: 400px;
  margin-bottom: 0;
}

.planner-execute {
  margin-bottom: 2rem;
}

#execute-sql-btn {
  background-color: var(--danger-color);
  margin-top: 1rem;
}

#execute-sql-btn:hover {
  background-color: #c0392b;
}

.planner-result pre {
  background-color: #1e1e1e;
  color: #d4d4d4;
  padding: 1rem;
  border-radius: 4px;
  overflow-x: auto;
  min-height: 100px;
}