/**
 * Valentine Website - Core Styles
 * ================================
 * Mobile-first, romantic design system
 */

/* ─────────────────────────────────────────────────────────────
   CSS CUSTOM PROPERTIES (Theme Variables)
   ───────────────────────────────────────────────────────────── */
:root {
  /* Colors */
  --color-primary: #FF6B9D;
  --color-primary-light: #FFB6C1;
  --color-primary-dark: #E91E63;
  --color-accent: #FF4081;
  --color-background: linear-gradient(135deg, #FFE5EC 0%, #FFF0F5 50%, #FFE5EC 100%);
  --color-card: rgba(255, 255, 255, 0.95);
  --color-text-primary: #4A4A4A;
  --color-text-secondary: #888888;
  --color-heart: #FF6B9D;
  --color-white: #FFFFFF;
  --color-success: #4CAF50;
  --color-warning: #FFB347;
  --color-sad: #9B8AA6;

  /* Typography */
  --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

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

  /* Border Radius */
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;
  --radius-full: 50%;

  /* Shadows */
  --shadow-soft: 0 4px 20px rgba(255, 107, 157, 0.15);
  --shadow-medium: 0 8px 32px rgba(255, 107, 157, 0.2);
  --shadow-strong: 0 12px 48px rgba(255, 107, 157, 0.25);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  /* Safe areas for iPhone notch */
  --safe-area-top: env(safe-area-inset-top);
  --safe-area-bottom: env(safe-area-inset-bottom);
}

/* ─────────────────────────────────────────────────────────────
   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;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-regular);
  color: var(--color-text-primary);
  background: var(--color-background);
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  line-height: 1.5;
}

/* ─────────────────────────────────────────────────────────────
   FLOATING HEARTS BACKGROUND
   ───────────────────────────────────────────────────────────── */
.hearts-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.floating-heart {
  position: absolute;
  font-size: 1.5rem;
  opacity: 0.3;
  animation: floatUp var(--float-duration, 15s) linear infinite;
  animation-delay: var(--float-delay, 0s);
}

/* ─────────────────────────────────────────────────────────────
   APP CONTAINER
   ───────────────────────────────────────────────────────────── */
.app-container {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
  padding-top: calc(var(--spacing-md) + var(--safe-area-top));
  padding-bottom: calc(var(--spacing-md) + var(--safe-area-bottom));
  z-index: 1;
}

/* ─────────────────────────────────────────────────────────────
   SCREENS
   ───────────────────────────────────────────────────────────── */
.screen {
  display: none;
  width: 100%;
  max-width: 420px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.screen.active {
  display: flex;
  flex-direction: column;
  align-items: center;
  opacity: 1;
  transform: translateY(0);
}

/* ─────────────────────────────────────────────────────────────
   WELCOME SCREEN
   ───────────────────────────────────────────────────────────── */
.welcome-content {
  text-align: center;
  padding: var(--spacing-lg);
}

.welcome-heart {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
  animation: heartPulse 1.5s ease-in-out infinite;
}

.welcome-title {
  font-size: 2rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-dark);
  margin-bottom: var(--spacing-sm);
  animation: fadeInUp 0.8s ease-out;
}

.welcome-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

/* ─────────────────────────────────────────────────────────────
   BUTTONS
   ───────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: 1rem 2rem;
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: var(--font-weight-semibold);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  min-height: 56px;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:active::after {
  opacity: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: var(--color-white);
  box-shadow: var(--shadow-medium);
}

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

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-soft);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-primary);
  border: 2px solid var(--color-primary-light);
  box-shadow: var(--shadow-soft);
}

.btn-secondary:hover {
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}

.btn-secondary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-start {
  animation: fadeInUp 0.8s ease-out 0.4s both, pulse 2s ease-in-out 1.5s infinite;
  padding: 1.25rem 2.5rem;
  font-size: 1.1rem;
}

/* ─────────────────────────────────────────────────────────────
   PROGRESS BAR
   ───────────────────────────────────────────────────────────── */
.progress-container {
  width: 100%;
  margin-bottom: var(--spacing-lg);
}

.progress-bar {
  height: 8px;
  background: rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-full);
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  width: 0%;
}

.progress-text {
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: var(--spacing-xs);
  font-weight: var(--font-weight-medium);
}

/* ─────────────────────────────────────────────────────────────
   QUESTION CARD
   ───────────────────────────────────────────────────────────── */
.question-card {
  background: var(--color-card);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-medium);
  width: 100%;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.question-text {
  font-size: 1.25rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  text-align: center;
  margin-bottom: var(--spacing-lg);
  line-height: 1.4;
}

/* ─────────────────────────────────────────────────────────────
   ANSWER OPTIONS
   ───────────────────────────────────────────────────────────── */
.answers-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.answer-option {
  position: relative;
}

.answer-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.answer-label {
  display: block;
  padding: 1rem 1.25rem;
  background: linear-gradient(135deg, #FFF5F7 0%, #FFFFFF 100%);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-normal);
  font-size: 0.95rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  text-align: left;
  min-height: 56px;
  display: flex;
  align-items: center;
}

.answer-label:hover {
  border-color: var(--color-primary-light);
  transform: translateX(4px);
  box-shadow: var(--shadow-soft);
}

.answer-input:checked+.answer-label {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, #FFE5EC 100%);
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
  transform: translateX(4px);
  box-shadow: var(--shadow-medium);
}

.answer-input:focus+.answer-label {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ─────────────────────────────────────────────────────────────
   NAVIGATION
   ───────────────────────────────────────────────────────────── */
.navigation {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
  width: 100%;
}

.navigation .btn {
  flex: 1;
}

.btn-back {
  flex: 0.8;
}

.btn-next {
  flex: 1.2;
}

/* ─────────────────────────────────────────────────────────────
   VALENTINE PROPOSAL SCREEN
   ───────────────────────────────────────────────────────────── */
.proposal-content {
  text-align: center;
  padding: var(--spacing-lg);
  width: 100%;
}

.proposal-hearts-ring {
  position: relative;
  width: 150px;
  height: 150px;
  margin: 0 auto var(--spacing-lg);
}

.ring-heart {
  position: absolute;
  font-size: 1.8rem;
  left: 50%;
  top: 50%;
  transform-origin: center;
  animation: orbitHeart 8s linear infinite;
  animation-delay: calc(var(--i) * -1s);
}

.proposal-title {
  font-size: 1.5rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  animation: fadeInUp 0.6s ease-out;
}

.proposal-question {
  font-size: 2rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-dark);
  margin-bottom: var(--spacing-xl);
  animation: fadeInUp 0.6s ease-out 0.2s both;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.proposal-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  animation: fadeInUp 0.6s ease-out 0.4s both;
}

.btn-proposal {
  width: 100%;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  justify-content: flex-start;
  text-align: left;
}

.btn-emoji {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.btn-text {
  flex: 1;
}

/* Yes Button - Exciting, prominent */
.btn-yes {
  background: linear-gradient(135deg, #FF6B9D 0%, #FF4081 100%);
  color: var(--color-white);
  box-shadow: 0 8px 32px rgba(255, 64, 129, 0.4);
  animation: pulse 2s ease-in-out infinite;
}

.btn-yes:hover {
  transform: scale(1.02);
  box-shadow: 0 12px 40px rgba(255, 64, 129, 0.5);
}

/* Not Sure Button - Gentle, understanding */
.btn-not-sure {
  background: linear-gradient(135deg, #FFE5EC 0%, #FFF0F5 100%);
  color: var(--color-primary-dark);
  border: 2px solid var(--color-primary-light);
  box-shadow: var(--shadow-soft);
}

.btn-not-sure:hover {
  background: linear-gradient(135deg, #FFD6E0 0%, #FFE5EC 100%);
  transform: translateY(-2px);
}

/* No Button - Subtle, respectful */
.btn-no {
  background: linear-gradient(135deg, #F5F5F5 0%, #EEEEEE 100%);
  color: var(--color-text-secondary);
  border: 2px solid #E0E0E0;
}

.btn-no:hover {
  background: linear-gradient(135deg, #EEEEEE 0%, #E0E0E0 100%);
  color: var(--color-text-primary);
}

/* ─────────────────────────────────────────────────────────────
   SUCCESS SCREEN
   ───────────────────────────────────────────────────────────── */
.success-content {
  text-align: center;
  padding: var(--spacing-lg);
}

.success-heart-container {
  position: relative;
  display: inline-block;
  margin-bottom: var(--spacing-lg);
}

.success-heart {
  font-size: 5rem;
  animation: heartBeat 1s ease-in-out infinite;
}

.sparkles {
  position: absolute;
  inset: -20px;
  pointer-events: none;
}

.sparkle {
  position: absolute;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  animation: sparkle 1.5s ease-in-out infinite;
}

.success-title {
  font-size: 2rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-dark);
  margin-bottom: var(--spacing-sm);
  animation: fadeInUp 0.6s ease-out;
}

.success-message {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.6;
  animation: fadeInUp 0.6s ease-out 0.2s both;
}

.success-signature {
  font-style: italic;
  color: var(--color-text-secondary);
  animation: fadeInUp 0.6s ease-out 0.4s both;
}

.signature-name {
  font-size: 1.25rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-top: var(--spacing-xs);
}

/* Success variants for different responses */
.success-screen.response-yes .success-heart {
  animation: celebrateHeart 0.8s ease-out, heartBeat 1s ease-in-out 0.8s infinite;
}

.success-screen.response-no .success-heart {
  animation: gentleFloat 3s ease-in-out infinite;
}

.success-screen.response-not-sure .success-heart {
  animation: gentlePulse 2s ease-in-out infinite;
}

/* ─────────────────────────────────────────────────────────────
   LOADING OVERLAY
   ───────────────────────────────────────────────────────────── */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.loading-overlay.active {
  opacity: 1;
  visibility: visible;
}

.loading-content {
  text-align: center;
}

.loading-heart {
  font-size: 3rem;
  animation: bounce 0.8s ease-in-out infinite;
}

.loading-content p {
  margin-top: var(--spacing-sm);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
}

/* ─────────────────────────────────────────────────────────────
   RESPONSIVE ADJUSTMENTS
   ───────────────────────────────────────────────────────────── */
@media (min-width: 768px) {
  .welcome-title {
    font-size: 2.5rem;
  }

  .question-text {
    font-size: 1.5rem;
  }

  .question-card {
    padding: var(--spacing-xl);
  }

  .proposal-question {
    font-size: 2.5rem;
  }
}

/* Small phones */
@media (max-width: 375px) {
  :root {
    font-size: 14px;
  }

  .welcome-heart {
    font-size: 3rem;
  }

  .question-card {
    padding: var(--spacing-md);
  }

  .proposal-hearts-ring {
    width: 120px;
    height: 120px;
  }
}

/* Landscape orientation */
@media (max-height: 600px) and (orientation: landscape) {
  .app-container {
    padding: var(--spacing-sm);
  }

  .welcome-heart {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
  }

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

  .proposal-hearts-ring {
    width: 100px;
    height: 100px;
  }
}