/* ========================================
   PROFESSIONAL VALENTINE STYLESHEET
   Author: Besong Wisdom
   Version: 2.0.0
   ======================================== */

/* CSS Variables - Easy Theme Management */
:root {
  /* Color Palette */
  --color-primary: #ff8da1;
  --color-primary-dark: #f26b8a;
  --color-primary-light: #ffe3e9;
  --color-secondary: #9f4b5c;
  --color-accent: #ffb7c5;
  --color-success: #b5e3c0;
  --color-error: #ffb3b3;
  --color-text: #4a2e3a;
  --color-text-light: #7e4a5b;
  --color-white: #ffffff;
  --color-overlay: rgba(255, 255, 255, 0.7);
  
  /* Typography */
  --font-primary: 'Quicksand', sans-serif;
  --font-display: 'Playfair Display', serif;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  
  /* Border Radius */
  --radius-sm: 20px;
  --radius-md: 32px;
  --radius-lg: 48px;
  --radius-full: 999px;
  
  /* Shadows */
  --shadow-sm: 0 4px 12px rgba(226, 144, 166, 0.15);
  --shadow-md: 0 8px 20px rgba(255, 128, 149, 0.2);
  --shadow-lg: 0 20px 40px rgba(226, 144, 166, 0.25);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.6s ease;
  
  /* Z-index layers */
  --z-background: 0;
  --z-floating: 10;
  --z-content: 20;
  --z-modal: 30;
  --z-toast: 40;
  --z-canvas: 50;
}

/* ===== RESET & BASE STYLES ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-primary);
  background: linear-gradient(145deg, #fff9fb 0%, #fff0f3 100%);
  color: var(--color-text);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.5;
}

/* ===== LOADING SCREEN ===== */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-white);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  transition: opacity var(--transition-slow);
}

.loading-screen.hidden {
  opacity: 0;
  pointer-events: none;
}

.heart-loader {
  font-size: 4rem;
  animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  25% { transform: scale(1.3); }
  50% { transform: scale(1); }
  75% { transform: scale(1.2); }
}

/* ===== FLOATING HEARTS ===== */
.floating-hearts {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: var(--z-background);
}

.heart {
  position: absolute;
  font-size: 24px;
  opacity: 0.4;
  color: var(--color-accent);
  animation: float 15s infinite linear;
  user-select: none;
  will-change: transform;
}

@keyframes float {
  0% {
    transform: translateY(100vh) rotate(0deg) scale(0.8);
    opacity: 0.4;
  }
  100% {
    transform: translateY(-20vh) rotate(360deg) scale(1.2);
    opacity: 0;
  }
}

/* ===== MAIN CONTAINER ===== */
.container {
  max-width: 480px;
  margin: 0 auto;
  padding: var(--spacing-md);
  position: relative;
  z-index: var(--z-content);
}

/* ===== SCREENS ===== */
.screen {
  display: none;
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.screen.active {
  display: block;
  opacity: 1;
  animation: screenEnter 0.8s var(--transition-normal);
}

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

.screen-content {
  background: var(--color-overlay);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl) var(--spacing-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.6);
}

/* ===== TYPOGRAPHY ===== */
.romantic-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-secondary);
  text-align: center;
  margin-bottom: var(--spacing-xl);
  line-height: 1.2;
}

.title-line {
  display: block;
}

.title-emoji {
  display: inline-block;
  font-size: 2.5rem;
  margin-top: var(--spacing-sm);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ===== FORM ELEMENTS ===== */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
  font-size: 0.95rem;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px solid var(--color-primary-light);
  border-radius: var(--radius-full);
  font-family: var(--font-primary);
  font-size: 1rem;
  background: var(--color-white);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 4px rgba(255, 141, 161, 0.1);
}

.form-textarea {
  border-radius: var(--radius-md);
  resize: vertical;
  min-height: 100px;
}

/* Gender Selector */
.gender-selector {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xs);
}

.gender-option {
  flex: 1;
  cursor: pointer;
}

.gender-option input[type="radio"] {
  display: none;
}

.gender-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-md);
  background: var(--color-white);
  border: 2px solid var(--color-primary-light);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.gender-option input[type="radio"]:checked + .gender-card {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  transform: scale(1.02);
  box-shadow: var(--shadow-sm);
}

.gender-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-xs);
}

.gender-label {
  font-weight: 600;
  color: var(--color-text);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-full);
  font-family: var(--font-primary);
  font-weight: 600;
  font-size: 1.1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  position: relative;
  overflow: hidden;
  width: 100%;
}

.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.3s, height 0.3s;
}

.btn:active::after {
  width: 200px;
  height: 200px;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--color-primary-light);
  color: var(--color-secondary);
  box-shadow: var(--shadow-sm);
}

.btn-heart {
  background: linear-gradient(135deg, #ffb3c1, #ff8da1);
  color: var(--color-white);
  font-size: 1.3rem;
  padding: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.btn-yes {
  background: #ffa7b6;
  color: var(--color-white);
}

.btn-no {
  background: #d9b5b5;
  color: #5a4a4a;
}

.btn-large {
  padding: var(--spacing-lg);
  font-size: 1.2rem;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ===== LOVE LETTER CARD ===== */
.love-letter-card {
  position: relative;
  background: rgba(255, 245, 247, 0.9);
  border-radius: var(--radius-md);
  padding: var(--spacing-xl);
  margin: var(--spacing-xl) 0;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(255, 255, 255, 0.8);
}

.letter-decoration {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.love-letter {
  font-size: 1.1rem;
  line-height: 1.8;
  font-style: italic;
  margin-bottom: var(--spacing-md);
}

.love-letter.female-letter {
  color: var(--color-secondary);
}

.love-letter.male-letter {
  color: #2e4a62;
}

.letter-signature {
  text-align: right;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-top: var(--spacing-md);
}

/* ===== INTERACTIVE ZONE ===== */
.interactive-zone {
  background: rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.popup-message {
  background: var(--color-white);
  border-radius: var(--radius-full);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-lg);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-secondary);
  text-align: center;
  margin: var(--spacing-md) 0;
  animation: popIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.5);
}

@keyframes popIn {
  from {
    opacity: 0;
    transform: scale(0.7);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Yes/No Section */
.yesno-section {
  text-align: center;
  margin-top: var(--spacing-xl);
}

.question {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  color: var(--color-secondary);
}

.yesno-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
}

.yes-response {
  margin-top: var(--spacing-md);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-primary-dark);
  animation: fadeIn 0.5s;
}

/* ===== MESSAGE SECTION ===== */
.message-section {
  margin-top: var(--spacing-xxl);
}

.section-title {
  font-size: 1.5rem;
  text-align: center;
  margin-bottom: var(--spacing-lg);
  color: var(--color-secondary);
}

.form-row {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.form-row .form-group {
  flex: 1;
  margin-bottom: 0;
}

/* ===== TOAST MESSAGES ===== */
.toast-message {
  position: fixed;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-success);
  color: #1c5727;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-full);
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  z-index: var(--z-toast);
  animation: slideUp 0.3s ease;
  max-width: 90%;
  text-align: center;
}

.toast-message.error {
  background: var(--color-error);
  color: #b13e3e;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translate(-50%, 20px);
  }
  to {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

/* ===== ERROR MESSAGE ===== */
.error-message {
  background: var(--color-error);
  color: #b13e3e;
  padding: var(--spacing-md);
  border-radius: var(--radius-full);
  text-align: center;
  font-weight: 600;
  margin-top: var(--spacing-md);
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-5px); }
  40% { transform: translateX(5px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}

/* ===== FOOTER ===== */
.screen-footer {
  margin-top: var(--spacing-xl);
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.heart-pulse {
  display: inline-block;
  animation: pulse 1.5s ease infinite;
  color: var(--color-primary);
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.2); }
}

/* ===== CONFITTI CANVAS ===== */
#confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: var(--z-canvas);
}

/* ===== UTILITY CLASSES ===== */
.hidden {
  display: none !important;
}

.animate-fade-in {
  animation: fadeIn 1s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 380px) {
  .romantic-title {
    font-size: 1.6rem;
  }
  
  .btn {
    font-size: 1rem;
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  .gender-card {
    padding: var(--spacing-sm);
  }
}

@media (min-width: 768px) {
  .container {
    max-width: 600px;
  }
  
  .screen-content {
    padding: var(--spacing-xxl);
  }
}

/* ===== PRINT STYLES ===== */
@media print {
  .floating-hearts,
  #confetti-canvas,
  .btn {
    display: none !important;
  }
}