/* ===== CSS Variables ===== */
:root {
  /* 基礎色 */
  --bg-primary: #1a1a1a;
  --bg-secondary: #242424;
  --bg-card: #2a2a2a;
  --text-primary: #e8e8e8;
  --text-secondary: #a0a0a0;
  --text-muted: #666;
  --border: #3a3a3a;

  /* 稀有度顏色（純色） */
  --rarity-common: #9d9d9d;
  --rarity-magic: #4a90d9;
  --rarity-rare: #d4af37;
  --rarity-epic: #a855f7;
  --rarity-legendary: #f97316;
  --rarity-ancient: #dc2626;

  /* 功能色 */
  --accent: #4a90d9;
  --success: #22c55e;

  /* 字型 */
  --font-sans: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

  /* 圓角 */
  --radius: 4px;
  --radius-lg: 8px;
}

/* ===== Reset ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  line-height: 1.5;
}

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: 420px;
}

/* ===== Header ===== */
.header {
  text-align: center;
  margin-bottom: 24px;
}

.header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.tagline {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* ===== Item Card ===== */
.item-card {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
  transition: border-color 0.2s;
}

/* 稀有度樣式 */
.item-card.rarity-common { border-color: var(--rarity-common); }
.item-card.rarity-magic { border-color: var(--rarity-magic); }
.item-card.rarity-rare { border-color: var(--rarity-rare); }
.item-card.rarity-epic { border-color: var(--rarity-epic); }
.item-card.rarity-legendary { border-color: var(--rarity-legendary); }
.item-card.rarity-ancient { border-color: var(--rarity-ancient); }

.item-rarity {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
  color: var(--rarity-common);
}

.item-card.rarity-common .item-rarity { color: var(--rarity-common); }
.item-card.rarity-magic .item-rarity { color: var(--rarity-magic); }
.item-card.rarity-rare .item-rarity { color: var(--rarity-rare); }
.item-card.rarity-epic .item-rarity { color: var(--rarity-epic); }
.item-card.rarity-legendary .item-rarity { color: var(--rarity-legendary); }
.item-card.rarity-ancient .item-rarity { color: var(--rarity-ancient); }

.item-name {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.item-card.rarity-common .item-name { color: var(--rarity-common); }
.item-card.rarity-magic .item-name { color: var(--rarity-magic); }
.item-card.rarity-rare .item-name { color: var(--rarity-rare); }
.item-card.rarity-epic .item-name { color: var(--rarity-epic); }
.item-card.rarity-legendary .item-name { color: var(--rarity-legendary); }
.item-card.rarity-ancient .item-name { color: var(--rarity-ancient); }

.item-password {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 16px;
  text-align: center;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.password-text {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  word-break: break-all;
  color: var(--text-primary);
  max-width: 100%;
  overflow-wrap: break-word;
}

.password-text.blinded {
  color: var(--text-muted);
  letter-spacing: 0.2em;
}

/* 裝備數值 */
.item-stats {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  padding: 12px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
}

.stat {
  flex: 1;
  text-align: center;
}

.stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* 卡片按鈕 */
.item-actions {
  display: flex;
  gap: 8px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}

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

.btn:active {
  transform: scale(0.98);
}

.btn-secondary {
  flex: 1;
}

.btn-forge {
  width: 100%;
  padding: 14px 20px;
  font-size: 1rem;
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  margin-bottom: 20px;
}

.btn-forge:hover {
  background: #3a7bc8;
  border-color: #3a7bc8;
}

/* ===== Forge Settings ===== */
.forge-settings {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.setting-group {
  margin-bottom: 16px;
}

.setting-group:last-child {
  margin-bottom: 0;
}

.setting-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.setting-title {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.length-value {
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 600;
}

/* ===== Slider ===== */
.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--bg-primary);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--accent);
  border-radius: 50%;
  border: none;
  cursor: pointer;
}

/* ===== Materials (Checkboxes) ===== */
.materials {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.material-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
}

.material-label input[type="checkbox"] {
  display: none;
}

.material-box {
  width: 16px;
  height: 16px;
  border: 2px solid var(--border);
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.15s;
}

.material-label input:checked + .material-box {
  background: var(--accent);
  border-color: var(--accent);
}

.material-label input:checked + .material-box::after {
  content: '';
  width: 6px;
  height: 6px;
  background: #fff;
  border-radius: 1px;
}

/* ===== Toggle Switch ===== */
.toggle-group {
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.toggle-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.toggle-text {
  font-size: 0.875rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.toggle-text i {
  color: var(--text-secondary);
}

.toggle-switch {
  position: relative;
  width: 44px;
  height: 24px;
}

.toggle-switch input {
  display: none;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--bg-primary);
  border-radius: 12px;
  border: 1px solid var(--border);
  transition: all 0.2s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  left: 2px;
  top: 2px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: all 0.2s;
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--accent);
  border-color: var(--accent);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(20px);
  background: #fff;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--success);
  color: #fff;
  padding: 12px 20px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  opacity: 0;
  transition: all 0.3s;
  pointer-events: none;
  z-index: 1000;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ===== Forge Animations ===== */

/* 鍛造中震動 */
@keyframes forge-shake {
  0%, 100% { transform: translateX(0); }
  10% { transform: translateX(-4px) rotate(-0.5deg); }
  20% { transform: translateX(4px) rotate(0.5deg); }
  30% { transform: translateX(-4px) rotate(-0.5deg); }
  40% { transform: translateX(4px) rotate(0.5deg); }
  50% { transform: translateX(-2px); }
  60% { transform: translateX(2px); }
  70% { transform: translateX(-2px); }
  80% { transform: translateX(2px); }
  90% { transform: translateX(-1px); }
}

.item-card.forging {
  animation: forge-shake 0.6s ease-out;
}

/* 稀有度揭曉光芒 */
@keyframes rarity-reveal {
  0% {
    box-shadow: 0 0 0 0 var(--glow-color);
    transform: scale(1);
  }
  50% {
    box-shadow: 0 0 30px 10px var(--glow-color);
    transform: scale(1.02);
  }
  100% {
    box-shadow: 0 0 0 0 transparent;
    transform: scale(1);
  }
}

.item-card.reveal {
  animation: rarity-reveal 0.5s ease-out;
}

.item-card.rarity-common.reveal { --glow-color: var(--rarity-common); }
.item-card.rarity-magic.reveal { --glow-color: var(--rarity-magic); }
.item-card.rarity-rare.reveal { --glow-color: var(--rarity-rare); }
.item-card.rarity-epic.reveal { --glow-color: var(--rarity-epic); }
.item-card.rarity-legendary.reveal { --glow-color: var(--rarity-legendary); }
.item-card.rarity-ancient.reveal { --glow-color: var(--rarity-ancient); }

/* 密碼滾動效果 */
@keyframes text-scramble {
  0% { opacity: 0.3; }
  50% { opacity: 0.8; }
  100% { opacity: 0.3; }
}

.password-text.scrambling {
  animation: text-scramble 0.1s infinite;
}

/* 鍛造按鈕效果 */
.btn-forge.forging {
  pointer-events: none;
  opacity: 0.7;
}

.btn-forge.forging i {
  animation: spin 0.5s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* 數值跳動 */
@keyframes stat-pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

.stat-value.pop {
  animation: stat-pop 0.3s ease-out;
}

/* 稀有度文字閃現 */
@keyframes rarity-flash {
  0% { opacity: 0; transform: translateY(-10px); }
  100% { opacity: 1; transform: translateY(0); }
}

.item-rarity.flash {
  animation: rarity-flash 0.3s ease-out;
}

.item-name.flash {
  animation: rarity-flash 0.3s ease-out 0.1s both;
}

/* ===== Responsive ===== */
@media (max-width: 480px) {
  body {
    padding: 16px;
    align-items: flex-start;
    padding-top: 40px;
  }

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