/* 圖書館切換選單 */
.library-select {
  padding: 8px 12px;
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  font-size: 0.875rem;
  min-width: 180px;
  background: white;
}

@media (max-width: 768px) {
  .library-select {
    font-size: 1rem;
    min-width: 120px;
    padding: 6px 8px;
  }
}
:root { 
  --pad: 20px; 
  --primary: #06b6d4;
  --primary-dark: #0891b2;
  --primary-light: #ecfeff;
  --danger: #ef4444;
  --success: #10b981;
  --warning: #f59e0b;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-900: #111827;
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius: 12px;
}

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

body { 
  font-family: 'Segoe UI', 'Microsoft JhengHei', system-ui, -apple-system, Roboto, Noto Sans, Arial, sans-serif; 
  background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
  color: var(--gray-900);
  line-height: 1.6;
  min-height: 100vh;
}

/* 導航列 */
.nav { 
  display: flex; 
  gap: 16px; 
  padding: var(--pad) 32px; 
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  border-bottom: 1px solid var(--gray-200); 
  align-items: center;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.nav a { 
  text-decoration: none; 
  color: var(--gray-700);
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 8px;
  transition: all 0.3s ease;
  position: relative;
}

.nav a:first-child {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav a:hover { 
  background: var(--primary-light);
  color: var(--primary-dark);
  transform: translateY(-2px);
}

.spacer { flex: 1; }

/* 漢堡選單 */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 30px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 101;
}

.hamburger span {
  width: 30px;
  height: 3px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: all 0.3s ease;
  transform-origin: center;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 響應式漢堡選單 */
@media (max-width: 768px) {
  .nav {
    padding: var(--pad);
    position: relative;
  }
  
  .hamburger {
    display: flex;
  }
  
  .nav-links {
    position: absolute;
    top: 100%;
    right: 0;
    flex-direction: column;
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    padding: 16px;
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 100;
  }
  
  .nav-links.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  
  .nav-links a {
    width: 100%;
    text-align: left;
    margin: 4px 0;
  }
  
  .nav-links img {
    margin: 8px 0;
    align-self: center;
  }
}

/* 容器 */
.container { 
  max-width: 1200px; 
  margin: 0 auto; 
  padding: 32px var(--pad); 
}

/* 卡片 */
.card { 
  background: #ffffff; 
  border: 1px solid var(--gray-200); 
  border-radius: var(--radius); 
  padding: 32px; 
  box-shadow: var(--shadow-lg);
  transition: all 0.3s ease;
}

.card:hover {
  box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

.card h2 {
  color: var(--gray-900);
  margin-bottom: 24px;
  font-size: 1.875rem;
  font-weight: 700;
  border-bottom: 3px solid var(--primary);
  padding-bottom: 12px;
  display: inline-block;
}

.card h3 {
  color: var(--gray-700);
  margin: 24px 0 16px;
  font-size: 1.25rem;
  font-weight: 600;
}

.card h1 {
  font-size: 2.5rem;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.card p {
  color: var(--gray-600);
  margin: 12px 0;
  font-size: 1.1rem;
}

/* 統計網格 */
.grid { 
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); 
  gap: 20px; 
  margin: 24px 0;
}

.stat { 
  padding: 24px; 
  border: 1px solid var(--gray-200); 
  border-radius: var(--radius); 
  text-align: center;
  background: linear-gradient(135deg, #ffffff 0%, var(--gray-50) 100%);
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
}

.stat:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.stat .num { 
  font-size: 2.5rem; 
  font-weight: 700; 
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

.stat .label { 
  font-size: 0.875rem; 
  color: var(--gray-600); 
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* 表單 */
.grid-form { 
  display: grid; 
  grid-template-columns: 2fr 1.5fr 1.5fr 1fr auto; 
  gap: 12px; 
  margin-bottom: 24px;
  align-items: flex-start;
}

.grid-form input, 
.grid-form select { 
  padding: 10px 16px;
  border: 2px solid var(--gray-200); 
  border-radius: 8px;
  font-size: 1rem;
  transition: all 0.3s ease;
  background: white;
  height: 40px;
  box-sizing: border-box;
  vertical-align: middle;
}

.grid-form div {
  position: relative;
  height: 40px;
  display: flex;
  align-items: center;
}

.grid-form input:focus, 
.grid-form select:focus { 
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

input[type="text"],
input[type="number"],
select {
  padding: 10px 16px; 
  border: 2px solid var(--gray-200); 
  border-radius: 8px;
  font-size: 1rem;
  transition: all 0.3s ease;
  background: white;
  width: 100%;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

label {
  display: block;
  margin: 16px 0 8px;
  font-weight: 600;
  color: var(--gray-700);
  font-size: 1rem;
}

/* 按鈕 */
.btn { 
  display: inline-block; 
  padding: 12px 24px; 
  border: none;
  border-radius: 8px; 
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
  text-decoration: none;
}

.btn:hover { 
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
}

.btn:active {
  transform: translateY(0);
}

/* 表格 */
table { 
  width: 100%; 
  border-collapse: collapse; 
  margin-top: 20px;
  background: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

thead {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
}

th, td { 
  border: 1px solid var(--gray-200); 
  padding: 16px; 
  text-align: left; 
}

th {
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
}

tbody tr {
  transition: all 0.2s ease;
}

tbody tr:nth-child(even) {
  background: var(--gray-50);
}

tbody tr:hover {
  background: var(--primary-light);
  transform: scale(1.01);
}

td {
  color: var(--gray-700);
}

/* 提示訊息 */
.flashes { 
  list-style: none; 
  padding: 0; 
  margin-bottom: 20px;
}

.flash { 
  padding: 16px 20px; 
  border-radius: var(--radius); 
  margin: 12px 0; 
  border-left: 4px solid;
  box-shadow: var(--shadow);
  font-weight: 500;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.flash.success { 
  background: #f0fdf4; 
  border-color: var(--success);
  color: #166534;
}

.flash.danger { 
  background: #fef2f2; 
  border-color: var(--danger);
  color: #991b1b;
}

.flash.info { 
  background: #eff6ff; 
  border-color: var(--primary);
  color: #1e40af;
}

.flash.warning { 
  background: #fffbeb; 
  border-color: var(--warning);
  color: #92400e;
}

/* 響應式設計 */
@media (max-width: 768px) {
  .nav {
    padding: var(--pad);
    flex-wrap: wrap;
  }
  
  .grid-form {
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }
  
  .grid {
    grid-template-columns: 1fr;
  }
  
  .container {
    padding: 16px;
  }
  
  .card {
    padding: 20px;
  }
  
  table {
    font-size: 0.875rem;
  }
  
  th, td {
    padding: 12px 8px;
  }
  
  /* 表格橫向滾動 */
  .table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  .table-container table {
    min-width: 600px; /* 確保表格不會被壓縮得太小 */
  }
}

/* 極小螢幕的額外響應式設計 */
@media (max-width: 480px) {
  .grid-form {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  
  .grid-form input,
  .grid-form select {
    font-size: 16px; /* 防止iOS縮放輸入框 */
  }
}

/* 載入動畫 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  animation: fadeIn 0.5s ease;
}