/* 
 * TextThemBack.ai — Design System
 * Designer: Pixel | NightForge | Feb 13, 2026
 * Launch: Valentine's Day 2026
 */

/* ============================================
   CSS VARIABLES — Design Tokens
   ============================================ */

:root {
  /* Base Colors */
  --night: #0a0a0f;
  --void: #121218;
  --smoke: #1e1e26;
  --ash: #2d2d38;
  --fog: #52525e;
  --silver: #a1a1aa;
  --frost: #e4e4e7;
  
  /* Accent Colors */
  --blush: #ff6b9d;
  --coral: #ff8966;
  --rose: #ff5c8a;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #ff6b9d 0%, #ff8966 100%);
  --gradient-muted: linear-gradient(135deg, rgba(255,107,157,0.15) 0%, rgba(255,137,102,0.15) 100%);
  --gradient-glow: radial-gradient(circle at 50% 0%, rgba(255,107,157,0.15), transparent 70%);
  
  /* Status Colors */
  --success: #6ee7b7;
  --caution: #fbbf24;
  --danger: #f87171;
  
  /* Typography */
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", monospace;
  
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  
  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Breakpoints (for JS reference) */
  --mobile: 640px;
  --tablet: 768px;
  --desktop: 1024px;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-base);
  font-size: var(--text-base);
  font-weight: var(--weight-normal);
  line-height: 1.6;
  color: var(--frost);
  background-color: var(--night);
  min-height: 100vh;
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-6);
  }
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  position: relative;
  text-align: center;
  padding: var(--space-16) 0;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 400px;
  background: var(--gradient-glow);
  pointer-events: none;
  z-index: 0;
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
  line-height: 1.2;
  margin-bottom: var(--space-4);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@media (min-width: 768px) {
  .hero {
    padding: var(--space-20) 0;
  }
  
  .hero__title {
    font-size: var(--text-5xl);
  }
}

.hero__subtitle {
  font-size: var(--text-lg);
  color: var(--silver);
  margin-bottom: var(--space-8);
}

/* ============================================
   INPUT CARD
   ============================================ */

.input-card {
  background: var(--void);
  border: 1px solid var(--ash);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  margin-bottom: var(--space-6);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

@media (min-width: 768px) {
  .input-card {
    padding: var(--space-6);
  }
}

.input-card:focus-within {
  border-color: var(--blush);
  box-shadow: 0 0 0 3px rgba(255, 107, 157, 0.2);
}

.input-card__textarea {
  width: 100%;
  min-height: 160px;
  background: transparent;
  border: none;
  outline: none;
  color: var(--frost);
  font-family: var(--font-base);
  font-size: var(--text-base);
  line-height: 1.6;
  resize: vertical;
}

@media (min-width: 768px) {
  .input-card__textarea {
    min-height: 200px;
  }
}

.input-card__textarea::placeholder {
  color: var(--fog);
}

/* ============================================
   BUTTON — CTA
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  font-family: var(--font-base);
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: white;
  background: var(--gradient-primary);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform var(--transition-fast), filter var(--transition-fast);
  width: 100%;
  min-height: 48px;
}

@media (min-width: 768px) {
  .btn {
    width: auto;
    min-width: 200px;
  }
}

.btn:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
}

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

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn--loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.btn--loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid white;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ============================================
   RESULTS SECTION
   ============================================ */

.results {
  margin-top: var(--space-12);
  animation: fadeIn var(--transition-slow);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   VIBE ANALYSIS CARD
   ============================================ */

.vibe-card {
  background: var(--gradient-muted);
  border: 1px solid var(--ash);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
  animation: fadeIn var(--transition-slow) 0.1s backwards;
}

.vibe-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.vibe-card__icon {
  font-size: var(--text-3xl);
  line-height: 1;
}

.vibe-card__title {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  color: var(--frost);
}

.vibe-card__analysis {
  font-size: var(--text-base);
  color: var(--silver);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

.vibe-card__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  border-radius: var(--radius-full);
  background: var(--smoke);
}

.vibe-card__badge--success {
  color: var(--success);
  border: 1px solid var(--success);
}

.vibe-card__badge--caution {
  color: var(--caution);
  border: 1px solid var(--caution);
}

.vibe-card__badge--danger {
  color: var(--danger);
  border: 1px solid var(--danger);
}

/* ============================================
   REPLY CARDS
   ============================================ */

.replies {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.reply-card {
  position: relative;
  background: var(--void);
  border: 1px solid var(--ash);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: border-color var(--transition-base), transform var(--transition-fast), box-shadow var(--transition-base);
  cursor: pointer;
  animation: fadeIn var(--transition-slow) backwards;
}

.reply-card:nth-child(1) { animation-delay: 0.2s; }
.reply-card:nth-child(2) { animation-delay: 0.3s; }
.reply-card:nth-child(3) { animation-delay: 0.4s; }

.reply-card:hover {
  border-color: var(--blush);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 107, 157, 0.2);
}

.reply-card__badge {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  background: var(--gradient-primary);
  color: white;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.reply-card__text {
  font-size: var(--text-base);
  color: var(--frost);
  line-height: 1.6;
  padding-right: var(--space-10);
  margin-bottom: var(--space-4);
}

.reply-card__actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
}

.reply-card__copy-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--silver);
  background: var(--smoke);
  border: 1px solid var(--ash);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.reply-card__copy-btn:hover {
  color: var(--frost);
  background: var(--gradient-primary);
  border-color: transparent;
}

.reply-card__copy-btn--copied {
  color: var(--success);
  border-color: var(--success);
}

/* ============================================
   SHAREABLE CARD (Screenshot View)
   ============================================ */

.share-card {
  position: relative;
  width: 1080px;
  min-height: 1350px;
  background: var(--night);
  padding: var(--space-10);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.share-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 600px;
  background: var(--gradient-glow);
  pointer-events: none;
  z-index: 0;
}

.share-card__content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.share-card__header {
  text-align: center;
}

.share-card__logo {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-6);
}

.share-card__input {
  background: var(--smoke);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

.share-card__input-label {
  font-size: var(--text-sm);
  color: var(--fog);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.share-card__input-text {
  font-size: var(--text-base);
  color: var(--fog);
  line-height: 1.6;
}

.share-card__vibe {
  margin-bottom: var(--space-6);
}

.share-card__vibe-label {
  font-size: var(--text-lg);
  color: var(--silver);
  margin-bottom: var(--space-3);
}

.share-card__vibe-text {
  font-size: var(--text-base);
  color: var(--frost);
  line-height: 1.6;
}

.share-card__reply {
  background: var(--void);
  border: 3px solid;
  border-image: var(--gradient-primary) 1;
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}

.share-card__reply-label {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--blush);
  margin-bottom: var(--space-4);
}

.share-card__reply-text {
  font-size: var(--text-xl);
  color: var(--frost);
  line-height: 1.6;
  font-weight: var(--weight-medium);
}

.share-card__footer {
  text-align: center;
  margin-top: auto;
  padding-top: var(--space-10);
}

.share-card__url {
  font-size: var(--text-base);
  color: var(--silver);
  font-weight: var(--weight-medium);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

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

.hidden { display: none; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ============================================
   FOCUS STYLES (Accessibility)
   ============================================ */

:focus-visible {
  outline: 2px solid var(--blush);
  outline-offset: 2px;
}

button:focus-visible,
.btn:focus-visible {
  outline: 2px solid white;
  outline-offset: 2px;
}

/* ============================================
   RESPONSIVE EMBEDS (for future video/iframe)
   ============================================ */

.embed-container {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 */
  height: 0;
  overflow: hidden;
  max-width: 100%;
}

.embed-container iframe,
.embed-container object,
.embed-container embed {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* ============================================
   PRINT STYLES (for screenshot generation)
   ============================================ */

@media print {
  body {
    background: var(--night);
  }
  
  .hero, .input-card, .btn {
    display: none;
  }
  
  .results {
    margin-top: 0;
  }
}