:root {
  --bg-color: #f4f6f8;
  --card-bg: #ffffff;
  --text-main: #2c3e50;
  --text-muted: #7f8c8d;
  --primary: #2980b9;
  --primary-hover: #3498db;
  --border: #e2e8f0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  margin: 0;
  padding: 40px 20px;
  display: flex;
  justify-content: center;
}

.container {
  width: 100%;
  max-width: 650px;
}

header {
  margin-bottom: 24px;
  text-align: center;
}

header h1 {
  margin: 0 0 8px 0;
  font-size: 1.8rem;
}

header p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.card {
  background: var(--card-bg);
  border-radius: 10px;
  padding: 24px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  margin-bottom: 24px;
  border: 1px solid var(--border);
}

.badge-tag {
  display: inline-block;
  background: #e1f5fe;
  color: #0288d1;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.date-info {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 16px;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}

.btn {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 10px 18px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  transition: background 0.2s;
}

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

.btn-secondary {
  background: #95a5a6;
}

.btn-secondary:hover {
  background: #7f8c8d;
}

.login-form input[type="password"] {
  width: 100%;
  padding: 10px;
  margin: 12px 0;
  box-sizing: border-box;
  border: 1px solid var(--border);
  border-radius: 6px;
}

/* Modal Popup */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-content {
  background: #fff;
  padding: 28px;
  border-radius: 12px;
  max-width: 450px;
  width: 90%;
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
  text-align: center;
}

.modal-actions {
  margin-top: 20px;
  display: flex;
  gap: 12px;
  justify-content: center;
}

.history-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.history-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.history-item:last-child {
  border-bottom: none;
}