body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 20px;
  color: var(--text-color);
  line-height: 1.6;
  background-color: var(--primary-bg);
}

.main-content-wrapper {
  margin: 0 auto;
  padding: 0 10px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

input, select {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 16px;
  box-sizing: border-box;
  transition: border 0.3s;
  background-color: var(--input-bg);
  box-shadow: inset 0 1px 3px var(--shadow-color);
  color: var(--input-text);
}

input:focus, select:focus {
  border-color: var(--header-bg);
  box-shadow: 0 0 0 3px var(--header-bg-shadow);
  outline: none;
}

input[type="number"] {
  appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

button {
  background-color: var(--button-bg);
  color: var(--button-text);
  padding: 12px 20px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
  font-weight: bold;
  width: 100%;
  transition: background-color 0.3s ease, transform 0.2s ease;
  box-shadow: 0 2px 5px var(--shadow-color);
}

button:hover {
  background-color: var(--button-bg-hover);
}

.button-style-match {
  border-radius: 8px;
  margin-bottom: 5px;
}

.message-box {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 2000;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
  width: 90%;
  max-width: 400px;
  border-radius: 10px;
  box-shadow: 0 4px 10px var(--shadow-color);
  box-sizing: border-box;
  background-color: var(--primary-bg);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.message-box-header {
  background-color: var(--header-bg);
  color: var(--header-text);
  padding: 15px 20px;
  border-bottom: 1px solid var(--border-color);
  border-top-left-radius: 10px;
  border-top-right-radius: 10px;
  display: grid;
  grid-template-columns: 80% 20%;
  align-items: center;
  text-align: center;
  width: 100%; 
  box-sizing: border-box; 
}

.message-box-header h3 {
  margin: 0;
  font-size: 1.4em;
  font-weight: bold;
  text-align: center;
}

.close-message-box {
  background: none;
  border: none;
  color: var(--header-text);
  font-size: 2em;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0;
}

.close-message-box:hover {
  color: var(--button-bg);
}

.message-box-content {
  color: var(--text-color);
  font-weight: bold;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 20px;
  gap: 15px;
  box-sizing: border-box;
  background-color: var(--secondary-bg);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  margin-top: 10px;
}

:root {
  --font-family: 'Inter', sans-serif;
  --primary-bg: #f0f2f5;
  --secondary-bg: #ffffff;
  --header-bg: #e74c3c;
  --header-text: white;
  --text-color: #333;
  --secondary-text-color: #666;
  --border-color: #ddd;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --input-bg: white;
  --input-text: #333;
  --input-border: #ccc;
  --button-bg: #c91f0c;
  --button-text: white;
  --collapsible-bg: #777;
  --collapsible-hover-bg: #555;
  --card-bg-gradient-start: #ffffff;
  --card-bg-gradient-end: #f9f9f9;
  --card-shadow: rgba(0, 0, 0, 0.1);
  --card-header-text: #34495e;
  --card-nickname-text: #7f8c8d;
  --iv-total-bg: #e8f5e9;
  --iv-total-text: #27ae60;
  --iv-border-dash: #eee;
  --iv-value-color: #3498db;
  --perfect-iv-color: #2ecc71;
  --zero-iv-color: #e74c3c;
  --type-nature-info-bg: #f8f8f8;
  --type-nature-label: #444;
  --type-nature-value: #2980b9;
  --egg-group-bg: #e0e0e0;
  --egg-group-text: #444;
  --cannot-breed-bg: #f9dede;
  --cannot-breed-text: #c0392b;
  --footer-label-color: #444;
  --footer-value-color: #007bff;
  --edit-button-bg: #3498db;
  --edit-button-hover-bg: #2980b9;
  --delete-button-bg: #e74c3c;
  --delete-button-hover-bg: #c0392b;
  --modal-bg: white;
  --modal-overlay-bg: rgba(0, 0, 0, 0.6);
  --modal-text: #555;
  --confirm-btn-bg: #2ecc71;
  --confirm-btn-hover-bg: #27ae60;
  --error-color: #EF4444;
  --accent-color: #3B82F6;
  --cancel-btn-bg: #95a5a6;
  --cancel-btn-hover-bg: #7f8c8d;
  --switch-fastest-bg: #ad1c1c;
  --switch-cheapest-bg: #d62c2c;
  --switch-slider-bg: white;
  --breeding-line-color: #d1d5db;
  --breeding-disabled-iv-bg: #e5e7eb;
  --breeding-disabled-iv-text: #6b7280;
  --side-nav-bg: #2c3e50;
  --side-nav-text: white;
  --side-nav-border: rgba(255, 255, 255, 0.1);
  --side-nav-hover-bg: #34495e;
  --side-nav-hover-text: #e74c3c;
  --hamburger-menu-bg: #e74c3c;
  --hamburger-menu-hover-bg: #c0392b;
  --hamburger-menu-text: white;
  --autocomplete-hover-bg: #f3f4f6;
  --message-box-success-bg: #10b981;
  --message-box-error-bg: #ef4444;
  --message-box-info-bg: #3b82f6;
  --header-bg-shadow: rgba(231, 76, 60, 0.2);
  --button-bg-hover: #c0392b;
  --switch-bg-on: #2196F3;
  --switch-bg-off: #ccc;
  --uncatchable-message-color: red;
  --instructions-color: #4CAF50; 
  --instructions-strong-color: #66BB6A;
}

body.dark-mode {
  --primary-bg: #1a202c;
  --secondary-bg: #2d3748;
  --header-bg: #2c5282;
  --header-text: #e2e8f0;
  --text-color: #e2e8f0;
  --secondary-text-color: #a0aec0;
  --border-color: #4a5568;
  --shadow-color: rgba(0, 0, 0, 0.4);
  --input-bg: #4a5568;
  --input-text: #e2e8f0;
  --input-border: #667eea;
  --button-bg: #4c6ef5;
  --button-text: white;
  --collapsible-bg: #4a5568;
  --collapsible-hover-bg: #2d3748;
  --card-bg-gradient-start: #2d3748;
  --card-bg-gradient-end: #4a5568;
  --card-shadow: rgba(0, 0, 0, 0.4);
  --card-header-text: #e2e8f0;
  --card-nickname-text: #a0aec0;
  --iv-total-bg: #48bb78;
  --iv-total-text: #e2e8f0;
  --iv-border-dash: #4a5568;
  --iv-value-color: #63b3ed;
  --perfect-iv-color: #68d391;
  --zero-iv-color: #fc8181;
  --type-nature-info-bg: #4a5568;
  --type-nature-label: #a0aec0;
  --type-nature-value: #9f7aea;
  --egg-group-bg: #4a5568;
  --egg-group-text: #e2e8f0;
  --cannot-breed-bg: #e53e3e;
  --cannot-breed-text: #e2e8f0;
  --footer-label-color: #a0aec0;
  --footer-value-color: #63b3ed;
  --edit-button-bg: #63b3ed;
  --edit-button-hover-bg: #4299e1;
  --delete-button-bg: #e53e3e;
  --delete-button-hover-bg: #c53030;
  --modal-bg: #2d3748;
  --modal-overlay-bg: rgba(0, 0, 0, 0.8);
  --modal-text: #e2e8f0;
  --confirm-btn-bg: #48bb78;
  --confirm-btn-hover-bg: #38a169;
  --cancel-btn-bg: #a0aec0;
  --cancel-btn-hover-bg: #718096;
  --switch-fastest-bg: #007bff;
  --switch-cheapest-bg: #4299e1;
  --switch-slider-bg: white;
  --breeding-line-color: #667eea;
  --breeding-disabled-iv-bg: #4a5568;
  --breeding-disabled-iv-text: #a0aec0;
  --side-nav-bg: #1a202c;
  --side-nav-text: #e2e8f0;
  --side-nav-border: rgba(255, 255, 255, 0.05);
  --side-nav-hover-bg: #2d3748;
  --side-nav-hover-text: #63b3ed;
  --hamburger-menu-bg: #2c5282;
  --hamburger-menu-hover-bg: #2a4365;
  --hamburger-menu-text: #e2e8f0;
  --autocomplete-hover-bg: #4a5568;
  --message-box-success-bg: #48bb78;
  --message-box-error-bg: #e53e3e;
  --message-box-info-bg: #63b3ed;
  --header-bg-shadow: rgba(102, 126, 234, 0.2);
  --button-bg-hover: #3b5bdb;
  --switch-bg-on: #63b3ed;
  --switch-bg-off: #718096;
  --uncatchable-message-color: #fc8181;
  --instructions-color: #68d391;
  --instructions-strong-color: #9ae6b4;
}