/* ==========================================================================
   CopyPrompt - Modern Dark Tech Theme
   ========================================================================== */

:root {
  --bg-primary: #0a0d14;
  --bg-secondary: #111523;
  --bg-card: #161c2d;
  --bg-card-hover: #1b233a;
  --bg-glass: rgba(22, 28, 45, 0.75);
  --bg-glass-nav: rgba(10, 13, 20, 0.85);

  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-hover: rgba(139, 92, 246, 0.35);
  --border-focus: #8b5cf6;

  --accent-blue: #38bdf8;
  --accent-purple: #8b5cf6;
  --accent-pink: #ec4899;
  --accent-indigo: #6366f1;
  --accent-green: #10b981;

  --gradient-brand: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
  --gradient-glow: linear-gradient(135deg, rgba(99, 102, 241, 0.25) 0%, rgba(139, 92, 246, 0.25) 50%, rgba(217, 70, 239, 0.2) 100%);
  --gradient-border: linear-gradient(135deg, rgba(99, 102, 241, 0.4), rgba(217, 70, 239, 0.4));

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: #a78bfa;

  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.5), 0 0 0 1px var(--border-subtle);
  --shadow-hover: 0 12px 30px -4px rgba(139, 92, 246, 0.2), 0 0 0 1px var(--border-hover);
  --shadow-btn: 0 4px 14px 0 rgba(99, 102, 241, 0.39);
  
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.12) 0%, transparent 60%),
    radial-gradient(circle at 85% 20%, rgba(217, 70, 239, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 15% 50%, rgba(56, 189, 248, 0.06) 0%, transparent 40%);
  background-attachment: fixed;
}

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Navbar */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background-color: var(--bg-glass-nav);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  transition: opacity var(--transition-fast);
}

.brand-link:hover {
  opacity: 0.9;
}

.brand-logo {
  width: 32px;
  height: 32px;
}

.brand-gradient {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-item a, .nav-action-btn {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
  background: none;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
}

.nav-item a:hover, .nav-action-btn:hover {
  color: var(--text-primary);
}

.fav-badge {
  background: rgba(236, 72, 153, 0.2);
  color: #f472b6;
  font-size: 0.75rem;
  padding: 0.1rem 0.45rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  display: none;
}

.fav-badge.active {
  display: inline-block;
}

.lang-btn {
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.lang-btn:hover {
  border-color: var(--accent-purple);
  background-color: var(--bg-card);
}

/* Hero Section */
.hero-section {
  padding: 4.5rem 0 2.5rem;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.25);
  color: var(--text-accent);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1.2rem;
  max-width: 650px;
  margin: 0 auto 2.5rem;
}

/* Search Box */
.search-wrapper {
  max-width: 680px;
  margin: 0 auto;
  position: relative;
}

.search-input-container {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 0.5rem 0.75rem 0.5rem 1.4rem;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
  transition: all var(--transition-normal);
}

.search-input-container:focus-within {
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.25), 0 10px 30px rgba(0, 0, 0, 0.4);
  background: var(--bg-card-hover);
}

.search-icon {
  color: var(--text-muted);
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-right: 0.75rem;
}

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 1.05rem;
  font-family: inherit;
  padding: 0.5rem 0;
}

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

.search-clear-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-full);
  display: none;
  align-items: center;
  justify-content: center;
}

.search-clear-btn.visible {
  display: flex;
}

.search-clear-btn:hover {
  color: var(--text-primary);
}

/* Category Filter Bar */
.filter-section {
  padding: 1.5rem 0 2rem;
}

.category-scroll-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.cat-chip {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.cat-chip:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.15);
  background: var(--bg-card);
}

.cat-chip.active {
  background: var(--gradient-brand);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.35);
  font-weight: 600;
}

/* Prompts Grid */
.prompts-section {
  padding: 1rem 0 4rem;
  flex: 1;
}

.section-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.results-count {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.prompts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 1.5rem;
}

/* Prompt Card */
.prompt-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  position: relative;
  box-shadow: var(--shadow-card);
}

.prompt-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
  background: var(--bg-card-hover);
}

.card-top-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.card-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(139, 92, 246, 0.12);
  color: var(--accent-purple);
  border: 1px solid rgba(139, 92, 246, 0.25);
  text-transform: capitalize;
}

.fav-toggle-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 0.3rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.fav-toggle-btn:hover {
  color: #f43f5e;
  transform: scale(1.15);
}

.fav-toggle-btn.is-fav {
  color: #f43f5e;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.card-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  flex: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1.25rem;
}

.tag-item {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
}

/* Prompt Preview Block */
.prompt-preview-block {
  background: rgba(10, 13, 20, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
  overflow: hidden;
}

.preview-content {
  max-height: 90px;
  overflow: hidden;
  position: relative;
  padding: 0.85rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.5;
  color: #cbd5e1;
  white-space: pre-wrap;
  word-break: break-word;
  transition: max-height 0.3s ease;
}

.preview-content::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 45px;
  background: linear-gradient(to bottom, transparent, rgba(10, 13, 20, 0.95));
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.preview-content.expanded {
  max-height: 500px;
  overflow-y: auto;
}

.preview-content.expanded::after {
  opacity: 0;
}

.preview-toggle-btn {
  width: 100%;
  background: transparent;
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--accent-purple);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.45rem;
  cursor: pointer;
  text-align: center;
  transition: background var(--transition-fast);
}

.preview-toggle-btn:hover {
  background: rgba(255, 255, 255, 0.03);
}

/* Copy Button */
.copy-action-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.25rem;
  min-height: 46px;
  border-radius: var(--radius-md);
  background: var(--gradient-brand);
  border: none;
  color: #ffffff;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-btn);
}

.copy-action-btn:hover {
  opacity: 0.95;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

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

.copy-action-btn.copied {
  background: linear-gradient(135deg, #059669 0%, #10b981 100%);
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.4);
}

/* Empty State */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4.5rem 1.5rem;
  background: var(--bg-card);
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-xl);
  margin-top: 1rem;
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.empty-state-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.empty-state-desc {
  color: var(--text-muted);
  max-width: 400px;
  margin: 0 auto;
}

/* About / Feature Showcase Section */
.about-section {
  padding: 4rem 0;
  border-top: 1px solid var(--border-subtle);
  background: rgba(17, 21, 35, 0.4);
}

.about-header {
  text-align: center;
  margin-bottom: 3rem;
}

.about-header h2 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.about-header p {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}

.feature-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: transform var(--transition-normal);
}

.feature-item:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
}

.feature-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(139, 92, 246, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.feature-item h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.feature-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-primary);
  padding: 3rem 0 2rem;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.15rem;
}

.footer-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  max-width: 480px;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Toast Notification */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  pointer-events: none;
}

.toast {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-hover);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.6);
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  transform: translateY(20px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: auto;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.25rem;
  }
  
  .hero-subtitle {
    font-size: 1.05rem;
  }
  
  .prompts-grid {
    grid-template-columns: 1fr;
  }

  .nav-links {
    gap: 0.75rem;
  }

  .nav-item-text {
    display: none;
  }

  .category-scroll-container {
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 0.5rem;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .category-scroll-container::-webkit-scrollbar {
    display: none;
  }

  .cat-chip {
    flex-shrink: 0;
  }

  .toast-container {
    bottom: 1rem;
    right: 1rem;
    left: 1rem;
  }

  .toast {
    justify-content: center;
  }
}