:root {
  --color-primary: #B71C1C;
  --color-secondary: #F57C00;
  --color-accent: #FFB74D;
  --color-bg: #FAFAFA;
  --color-card: #FFFFFF;
  --color-text-main: #212121;
  --color-text-secondary: #616161;
  --color-success: #2E7D32;
  --color-warning: #EF6C00;
  --color-error: #D32F2F;
  --color-border: #E0E0E0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Microsoft JhengHei", sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.6;
}

/* ========== Header ========== */
header {
  background-color: var(--color-primary);
  color: white;
  padding: 1rem 2rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header .header-content h1 {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

header .header-content p {
  font-size: 0.9rem;
  opacity: 0.9;
}

header .header-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
}

header .btn-login {
  background-color: var(--color-secondary);
  color: white;
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
}

header .btn-login:hover {
  background-color: var(--color-warning);
}

/* ========== Navigation ========== */
nav {
  background-color: #FAFAFA;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  gap: 2rem;
}

nav a {
  text-decoration: none;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all 0.3s ease;
}

nav a:hover,
nav a.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-secondary);
}

/* ========== Main Container ========== */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* ========== Card Layout ========== */
.card {
  background-color: var(--color-card);
  border-radius: 8px;
  padding: 2rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  border: 1px solid var(--color-border);
}

.card h2 {
  color: var(--color-primary);
  margin-bottom: 1rem;
  font-size: 1.5rem;
  border-left: 4px solid var(--color-secondary);
  padding-left: 1rem;
}

.card h3 {
  color: var(--color-secondary);
  margin-top: 1.5rem;
  margin-bottom: 0.8rem;
  font-size: 1.2rem;
}

/* ========== Button ========== */
.btn {
  padding: 0.8rem 1.5rem;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 500;
}

.btn-primary {
  background-color: var(--color-secondary);
  color: white;
}

.btn-primary:hover {
  background-color: var(--color-warning);
}

.btn-secondary {
  border: 2px solid var(--color-secondary);
  color: var(--color-secondary);
  background-color: transparent;
}

.btn-secondary:hover {
  background-color: #FFF3E0;
}

.btn-success {
  background-color: var(--color-success);
  color: white;
}

.btn-success:hover {
  opacity: 0.85;
}

/* 按鈕 disabled 狀態 */
.btn:disabled,
.btn[disabled] {
  background-color: #BDBDBD;
  color: #757575;
  cursor: not-allowed;
  opacity: 0.7;
  border-color: #BDBDBD;
}

.btn:disabled:hover,
.btn[disabled]:hover {
  background-color: #BDBDBD;
  opacity: 0.7;
}

/* ========== Form Elements ========== */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--color-text-main);
}

.form-group label .required {
  color: var(--color-error);
  font-weight: bold;
}

/* 表單提示文字 */
.form-hint {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: 0.3rem;
  margin-bottom: 0.5rem;
}

/* Radio Button 群組 */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.radio-label {
  display: flex;
  align-items: center;
  cursor: pointer;
  font-weight: normal;
}

.radio-label input[type="radio"] {
  width: auto;
  margin-right: 0.5rem;
  cursor: pointer;
}

.radio-label span {
  color: var(--color-text-main);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(245, 124, 0, 0.1);
}

/* ========== Grid Layout ========== */
.grid {
  display: grid;
  gap: 1.5rem;
}

/* TailwindCSS 已處理響應式網格，移除舊的 auto-fit */

/* ========== Activity Card ========== */
.activity-item {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--color-card);
  transition: all 0.3s ease;
}

.activity-item.clickable {
  cursor: pointer;
}

.activity-item.clickable:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  transform: translateY(-4px);
  border-color: var(--color-secondary);
}

.activity-item.disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.activity-item:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.activity-image {
  width: 100%;
  height: 200px;
  background-color: var(--color-bg);
  display: block;
  overflow: hidden;
}

.activity-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.activity-content {
  padding: 1.5rem;
}

.activity-content h3 {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.activity-info {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  line-height: 1.8;
}

.quota-info {
  background-color: var(--color-bg);
  padding: 0.8rem;
  border-radius: 4px;
  margin-bottom: 1rem;
  font-weight: 500;
}

.quota-info.full {
  color: var(--color-error);
}

.quota-info.available {
  color: var(--color-success);
}

/* ========== Activity Detail Modal ========== */
.activity-detail-info {
  line-height: 2;
}

.activity-detail-info p {
  margin-bottom: 0.8rem;
  font-size: 1rem;
}

.activity-detail-info strong {
  color: var(--color-text-secondary);
}

.activity-detail-info span {
  color: var(--color-text-main);
}

/* ========== Status Badge ========== */
.badge {
  display: inline-block;
  padding: 0.4rem 0.8rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-right: 0.5rem;
}

.badge.success {
  background-color: rgba(46, 125, 50, 0.1);
  color: var(--color-success);
}

.badge.error {
  background-color: rgba(211, 47, 47, 0.1);
  color: var(--color-error);
}

.badge.warning {
  background-color: rgba(239, 108, 0, 0.1);
  color: var(--color-warning);
}

/* ========== List Table ========== */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

table thead {
  background-color: var(--color-bg);
  color: var(--color-text-main);
}

table th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--color-secondary);
}

table td {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--color-border);
}

table tbody tr:hover {
  background-color: #FAFAFA;
}

/* ========== Alert ========== */
.alert {
  padding: 1rem;
  border-radius: 4px;
  margin-bottom: 1.5rem;
  border-left: 4px solid;
}

.alert.success {
  background-color: rgba(46, 125, 50, 0.1);
  border-left-color: var(--color-success);
  color: var(--color-success);
}

.alert.error {
  background-color: rgba(211, 47, 47, 0.1);
  border-left-color: var(--color-error);
  color: var(--color-error);
}

.alert.info {
  background-color: rgba(25, 118, 210, 0.1);
  border-left-color: #1976D2;
  color: #1976D2;
}

/* ========== Modal ========== */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  overflow-y: auto;
  justify-content: center;
  align-items: flex-start;
  padding: 2rem 1rem;
}

/* 鎖定背景滲動 */
body.modal-open {
  overflow: hidden;
}

.modal-content {
  background-color: var(--color-card);
  border-radius: 8px;
  width: 100%;
  max-width: 700px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  margin: auto;
}

.modal.active.visible .modal-content {
  transform: translateY(0);
  opacity: 1;
}

/* 海報區域 */
.modal-poster {
  width: 100%;
  border-radius: 8px 8px 0 0;
  overflow: hidden;
  padding-top: 2rem;
  padding-bottom: 2rem;
  background-color: #f5f5f5;
}

.modal-poster img {
  width: 100%;
  height: auto;
  max-height: 500px;
  object-fit: contain;
  display: block;
  background-color: #f5f5f5;
}

.poster-placeholder {
  width: 100%;
  height: 300px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
}

@keyframes slideUp {
  from {
    transform: translateY(50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 2px solid var(--color-secondary);
}

.modal-header h2 {
  color: var(--color-primary);
  font-size: 1.3rem;
  margin: 0;
}

/* 活動資訊區域 */
.modal-activity-info {
  padding: 1rem 1.5rem;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.modal-activity-info .info-item {
  display: flex;
  align-items: center;
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.modal-activity-info .info-item:last-child {
  margin-bottom: 0;
}

.modal-activity-info .info-icon {
  width: 1.5rem;
  text-align: center;
  flex-shrink: 0;
  margin-right: 0.5rem;
}

.modal-activity-info .info-label {
  color: var(--color-text-secondary);
  width: 5.5rem;
  flex-shrink: 0;
  text-align: justify;
  text-align-last: justify;
}

.modal-activity-info .info-value {
  color: var(--color-text-main);
  font-weight: 500;
  flex: 1;
}

.modal-activity-info .info-description {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text-main);
}

.modal-close {
  background: none;
  border: none;
  font-size: 2rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.3s ease;
}

.modal-close:hover {
  color: var(--color-primary);
}

.modal-body {
  padding: 2rem;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  padding: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.modal-footer .btn {
  min-width: 100px;
}

/* ========== Success Toast ========== */
.success-toast {
  position: fixed;
  top: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #2E7D32, #43A047);
  color: white;
  padding: 1.2rem 2rem;
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(46, 125, 50, 0.4);
  z-index: 2000;
  display: none;
  align-items: center;
  gap: 0.8rem;
  font-weight: 500;
  font-size: 1rem;
  min-width: 320px;
  max-width: 90%;
}

.toast-icon {
  font-size: 1.5rem;
  font-weight: bold;
  background-color: rgba(255, 255, 255, 0.3);
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.toast-message {
  flex: 1;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
  header {
    flex-direction: column;
    align-items: flex-start;
  }

  header .header-actions {
    margin-top: 1rem;
  }

  nav {
    flex-direction: column;
    gap: 0.5rem;
  }

  main {
    padding: 1rem;
  }

  .card {
    padding: 1.5rem;
  }

  header .header-content h1 {
    font-size: 1.4rem;
  }

  .modal-content {
    width: 95%;
    max-width: 100%;
  }

  .grid {
    grid-template-columns: 1fr;
  }
}