/* ===========================================
   Font Mixer - Style Sheet
   The Bar Aesthetic: Modern Speakeasy
   =========================================== */

/* --- CSS Variables --- */
:root {
  /* Colors */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  /* Neon Colors */
  --neon-pink: #ff006e;
  --neon-cyan: #00f5d4;
  --neon-yellow: #fee440;
  --neon-purple: #9b5de5;
  --neon-orange: #fb5607;

  /* Gradients */
  --gradient-neon: linear-gradient(135deg, var(--neon-pink), var(--neon-purple), var(--neon-cyan));
  --gradient-gold: linear-gradient(135deg, #d4af37, #f5d061, #d4af37);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
  --shadow-neon: 0 0 20px rgba(255, 0, 110, 0.3), 0 0 40px rgba(155, 93, 229, 0.2);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background Pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    radial-gradient(circle at 20% 80%, rgba(255, 0, 110, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(0, 245, 212, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(155, 93, 229, 0.05) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
}

a {
  color: var(--neon-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--neon-pink);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* --- App Container --- */
.app {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-lg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- Header --- */
.header {
  text-align: center;
  padding: var(--space-2xl) 0;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.logo-icon {
  font-size: 2.5rem;
  animation: shake 2s ease-in-out infinite;
}

@keyframes shake {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(-10deg); }
  75% { transform: rotate(10deg); }
}

.logo-text {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 3rem;
  letter-spacing: 0.05em;
  background: var(--gradient-neon);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--text-muted);
  border-radius: var(--radius-sm);
}

.tagline {
  color: var(--text-secondary);
  font-size: 1.125rem;
}

/* --- Main Content --- */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

/* --- Shaker Section --- */
.shaker-section {
  position: relative;
}

.shaker {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.shaker:focus-within {
  box-shadow: var(--shadow-neon);
}

.shaker.shaking {
  animation: shaker-shake 0.5s ease-in-out;
}

@keyframes shaker-shake {
  0%, 100% { transform: translateX(0) rotate(0deg); }
  10% { transform: translateX(-10px) rotate(-5deg); }
  20% { transform: translateX(10px) rotate(5deg); }
  30% { transform: translateX(-10px) rotate(-5deg); }
  40% { transform: translateX(10px) rotate(5deg); }
  50% { transform: translateX(-5px) rotate(-2deg); }
  60% { transform: translateX(5px) rotate(2deg); }
  70% { transform: translateX(-5px) rotate(-2deg); }
  80% { transform: translateX(5px) rotate(2deg); }
  90% { transform: translateX(-2px) rotate(-1deg); }
}

.shaker-label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.input-wrapper {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.vibe-input {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  font-size: 1.125rem;
  background: var(--bg-primary);
  border: 2px solid var(--bg-card);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.vibe-input::placeholder {
  color: var(--text-muted);
}

.vibe-input:focus {
  outline: none;
  border-color: var(--neon-purple);
  box-shadow: 0 0 0 3px rgba(155, 93, 229, 0.2);
}

.mix-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--gradient-neon);
  border-radius: var(--radius-lg);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.mix-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-neon);
}

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

.mix-btn-icon {
  font-size: 1.25rem;
}

/* Quick Tags */
.quick-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  padding: var(--space-xs) var(--space-md);
  font-size: 0.875rem;
  color: var(--text-secondary);
  background: var(--bg-primary);
  border: 1px solid var(--bg-card);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.tag:hover {
  color: var(--text-primary);
  border-color: var(--neon-cyan);
  background: rgba(0, 245, 212, 0.1);
}

.tag:active {
  transform: scale(0.95);
}

/* --- Coaster Section --- */
.coaster-section {
  position: relative;
}

.coaster {
  position: relative;
  padding: var(--space-xl);
}

.coaster-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(155, 93, 229, 0.2) 0%, transparent 70%);
  filter: blur(40px);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.coaster.active .coaster-glow {
  opacity: 1;
}

.preview-card {
  position: relative;
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  border: 1px solid rgba(255, 255, 255, 0.1);
  min-height: 200px;
  opacity: 0.5;
  transform: scale(0.98);
  transition: all var(--transition-slow);
}

.coaster.active .preview-card {
  opacity: 1;
  transform: scale(1);
}

.preview-title {
  font-size: 2rem;
  margin-bottom: var(--space-md);
  outline: none;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition-fast);
}

.preview-title:focus {
  border-bottom-color: var(--neon-cyan);
}

.preview-title:empty::before {
  content: '點擊輸入標題...';
  color: var(--text-muted);
}

.preview-body {
  font-size: 1.125rem;
  line-height: 1.8;
  outline: none;
  border-left: 2px solid transparent;
  padding-left: var(--space-md);
  transition: border-color var(--transition-fast);
}

.preview-body:focus {
  border-left-color: var(--neon-cyan);
}

.preview-body:empty::before {
  content: '點擊輸入內文...';
  color: var(--text-muted);
}

.recipe-name {
  text-align: center;
  margin-top: var(--space-lg);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color var(--transition-normal);
}

.coaster.active .recipe-name {
  color: var(--neon-yellow);
  text-shadow: 0 0 10px rgba(254, 228, 64, 0.5);
}

.font-combo-note {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--space-sm);
}

/* --- Recipe Section --- */
.recipe-section {
  position: relative;
}

.recipe {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.recipe-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
}

.recipe-title {
  font-size: 1rem;
  color: var(--text-secondary);
}

.copy-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background: var(--neon-cyan);
  color: var(--bg-primary);
}

.copy-btn.copied {
  background: var(--neon-cyan);
  color: var(--bg-primary);
}

.recipe-content {
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  overflow-x: auto;
}

.recipe-code {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.875rem;
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-break: break-all;
  line-height: 1.6;
}

.recipe-fonts {
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--bg-card);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.recipe-fonts-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-xs);
}

.recipe-fonts-header p {
  margin: 0;
}

.copy-font-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.75rem;
  transition: all var(--transition-fast);
}

.copy-font-btn:hover {
  background: var(--neon-cyan);
  color: var(--bg-primary);
}

.copy-font-btn.copied {
  background: var(--neon-cyan);
  color: var(--bg-primary);
}

.recipe-fonts code {
  display: block;
  background: var(--bg-primary);
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  word-break: break-all;
  color: var(--text-secondary);
}

/* 選取文字樣式 */
.recipe-fonts code::selection {
  background: var(--neon-cyan);
  color: var(--bg-primary);
}

.recipe-code::selection {
  background: var(--neon-cyan);
  color: var(--bg-primary);
}

.vibe-coding-tip {
  margin-top: var(--space-sm);
  padding: var(--space-sm);
  background: rgba(155, 93, 229, 0.1);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --- Recommend Section --- */
.recommend-section {
  margin-top: var(--space-lg);
}

.recommend-panel {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
}

.recommend-title {
  padding: var(--space-md) var(--space-lg);
  font-size: 0.875rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.recommend-title:hover {
  background: var(--bg-card);
}

.recommend-content {
  padding: var(--space-lg);
  border-top: 1px solid var(--bg-card);
}

.recommend-intro {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  font-size: 0.875rem;
}

.recommend-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.recommend-list li {
  padding: var(--space-sm);
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}

.recommend-list strong {
  color: var(--text-primary);
}

.recommend-list a {
  margin-left: var(--space-xs);
  font-size: 0.75rem;
}

.recommend-note {
  margin-top: var(--space-md);
  padding: var(--space-md);
  background: rgba(254, 228, 64, 0.1);
  border: 1px solid rgba(254, 228, 64, 0.3);
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  color: var(--neon-yellow);
}

/* --- Footer --- */
.footer {
  margin-top: auto;
  padding: var(--space-xl) 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.separator {
  margin: 0 var(--space-sm);
  opacity: 0.5;
}

.copyright {
  margin-top: var(--space-sm);
  font-size: 0.75rem;
}

/* --- Toast --- */
.toast {
  position: fixed;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 0.875rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 1000;
}

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

/* --- Responsive --- */
@media (max-width: 640px) {
  .app {
    padding: var(--space-md);
  }

  .logo-text {
    font-size: 2rem;
  }

  .logo-subtitle {
    display: none;
  }

  .input-wrapper {
    flex-direction: column;
  }

  .mix-btn {
    justify-content: center;
  }

  .preview-title {
    font-size: 1.5rem;
  }

  .preview-body {
    font-size: 1rem;
  }

  .recipe-header {
    flex-direction: column;
    gap: var(--space-sm);
    align-items: flex-start;
  }
}

/* --- [L05] Keyboard Navigation Focus Styles --- */
.mix-btn:focus-visible,
.copy-btn:focus-visible,
.copy-font-btn:focus-visible {
  outline: 2px solid var(--neon-cyan);
  outline-offset: 2px;
}

.tag:focus-visible {
  outline: 2px solid var(--neon-yellow);
  outline-offset: 2px;
}

.vibe-input:focus-visible {
  outline: 2px solid var(--neon-cyan);
  outline-offset: 2px;
}

.back-link:focus-visible {
  outline: 2px solid var(--neon-cyan);
  outline-offset: 2px;
}