@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;700&family=Noto+Sans+SC:wght@300;400;500&display=swap');

:root {
  --primary-red: #8B0000;
  --dark-red: #5C0000;
  --gold: #D4AF37;
  --light-gold: #F4E4BA;
  --paper: #F5F5DC;
  --paper-dark: #E8E4C9;
  --text-dark: #2C2C2C;
  --text-light: #F5F5DC;
}

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

body {
  font-family: 'Noto Sans SC', sans-serif;
  background: linear-gradient(135deg, #1a0505 0%, #2d0a0a 50%, #1a0505 100%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
  overflow: hidden;
}

.container {
  width: 100%;
  max-width: 480px;
  perspective: 1200px;
}

.header {
  text-align: center;
  margin-bottom: 30px;
  position: relative;
}

.header h1 {
  font-family: 'Noto Serif SC', serif;
  font-size: 2.2rem;
  color: var(--gold);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
  letter-spacing: 4px;
}

.header::before,
.header::after {
  content: '★';
  color: var(--gold);
  font-size: 1.2rem;
  margin: 0 15px;
  vertical-align: middle;
}

.header .subtitle {
  font-family: 'Noto Serif SC', serif;
  color: var(--light-gold);
  font-size: 1rem;
  margin-top: 10px;
  letter-spacing: 2px;
}

.card-container {
  width: 100%;
  height: 520px;
  position: relative;
}

.card {
  width: 100%;
  height: 100%;
  position: absolute;
  transform-style: preserve-3d;
  transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  cursor: pointer;
}

.card.flipped {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 
    0 20px 60px rgba(0, 0, 0, 0.5),
    inset 0 0 0 3px var(--gold),
    inset 0 0 30px rgba(139, 0, 0, 0.3);
}

.card-front {
  background: linear-gradient(145deg, var(--paper) 0%, var(--paper-dark) 100%);
}

.card-front::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 30px,
      rgba(139, 0, 0, 0.03) 30px,
      rgba(139, 0, 0, 0.03) 31px
    );
  pointer-events: none;
}

.card-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: sepia(30%) contrast(1.1) brightness(0.7);
  z-index: 0;
}

.card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    180deg,
    rgba(139, 0, 0, 0.85) 0%,
    rgba(139, 0, 0, 0.7) 50%,
    rgba(92, 0, 0, 0.85) 100%
  );
  z-index: 1;
}

.card-content {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 30px;
  text-align: center;
}

.card-number {
  position: absolute;
  top: 20px;
  right: 20px;
  font-family: 'Noto Serif SC', serif;
  font-size: 3rem;
  color: var(--gold);
  opacity: 0.6;
  font-weight: 700;
}

.card-category {
  display: inline-block;
  padding: 6px 20px;
  background: var(--gold);
  color: var(--dark-red);
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: 20px;
  margin-bottom: 25px;
  letter-spacing: 1px;
}

.card-quote {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.6rem;
  color: var(--text-light);
  line-height: 1.8;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
  max-width: 380px;
}

.card-quote::before,
.card-quote::after {
  content: '"';
  font-size: 2rem;
  color: var(--gold);
}

.card-hint {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--light-gold);
  font-size: 0.8rem;
  opacity: 0.7;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-hint span {
  animation: bounce 1.5s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-5px); }
  60% { transform: translateY(-3px); }
}

.card-back {
  background: linear-gradient(145deg, var(--primary-red) 0%, var(--dark-red) 100%);
  transform: rotateY(180deg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 30px;
}

.card-back::before {
  content: '';
  position: absolute;
  top: 15px;
  left: 15px;
  right: 15px;
  bottom: 15px;
  border: 2px solid var(--gold);
  border-radius: 10px;
  opacity: 0.5;
}

.card-back-content {
  text-align: center;
  color: var(--text-light);
  position: relative;
  z-index: 2;
}

.card-back-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.3rem;
  color: var(--gold);
  margin-bottom: 20px;
  letter-spacing: 2px;
}

.card-back-source {
  font-size: 1.1rem;
  line-height: 1.8;
  max-width: 320px;
  opacity: 0.9;
}

.card-back-hint {
  position: absolute;
  bottom: 20px;
  color: var(--light-gold);
  font-size: 0.8rem;
  opacity: 0.7;
}

.controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  margin-top: 30px;
}

.btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 2px solid var(--gold);
  background: transparent;
  color: var(--gold);
  font-size: 1.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn:hover {
  background: var(--gold);
  color: var(--dark-red);
  transform: scale(1.1);
}

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

.progress {
  font-family: 'Noto Serif SC', serif;
  color: var(--light-gold);
  font-size: 1rem;
  min-width: 120px;
  text-align: center;
}

.progress-bar {
  width: 100%;
  max-width: 480px;
  height: 4px;
  background: rgba(212, 175, 55, 0.2);
  border-radius: 2px;
  margin-top: 20px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--gold);
  border-radius: 2px;
  transition: width 0.3s ease;
}

.corner-decoration {
  position: fixed;
  width: 120px;
  height: 120px;
  opacity: 0.1;
  pointer-events: none;
}

.corner-decoration.top-left {
  top: 0;
  left: 0;
  background: linear-gradient(135deg, var(--gold) 0%, transparent 50%);
}

.corner-decoration.top-right {
  top: 0;
  right: 0;
  background: linear-gradient(225deg, var(--gold) 0%, transparent 50%);
}

.corner-decoration.bottom-left {
  bottom: 0;
  left: 0;
  background: linear-gradient(45deg, var(--gold) 0%, transparent 50%);
}

.corner-decoration.bottom-right {
  bottom: 0;
  right: 0;
  background: linear-gradient(315deg, var(--gold) 0%, transparent 50%);
}

@media (max-width: 768px) {
  .header h1 {
    font-size: 1.8rem;
  }
  
  .header .subtitle {
    font-size: 0.9rem;
  }
  
  .card-container {
    height: 500px;
  }
  
  .card-quote {
    font-size: 1.4rem;
  }
  
  .card-content {
    padding: 25px;
  }
}

@media (max-width: 480px) {
  body {
    padding: 15px;
  }
  
  .header {
    margin-bottom: 20px;
  }
  
  .header h1 {
    font-size: 1.5rem;
    letter-spacing: 2px;
  }
  
  .header .subtitle {
    font-size: 0.8rem;
    margin-top: 8px;
  }
  
  .header::before,
  .header::after {
    font-size: 0.9rem;
    margin: 0 8px;
  }
  
  .card-container {
    height: 420px;
  }
  
  .card-quote {
    font-size: 1.2rem;
    line-height: 1.6;
  }
  
  .card-number {
    font-size: 1.8rem;
  }
  
  .card-category {
    font-size: 0.75rem;
    padding: 4px 15px;
    margin-bottom: 15px;
  }
  
  .card-content {
    padding: 20px;
  }
  
  .card-hint {
    font-size: 0.7rem;
    bottom: 15px;
  }
  
  .controls {
    margin-top: 20px;
  }
  
  .progress {
    font-size: 0.85rem;
  }
  
  .corner-decoration {
    width: 60px;
    height: 60px;
  }
}

@media (max-width: 360px) {
  .header h1 {
    font-size: 1.3rem;
  }
  
  .card-container {
    height: 380px;
  }
  
  .card-quote {
    font-size: 1.1rem;
  }
}

.card.flash-effect {
  animation: flash 0.5s ease-out;
}

@keyframes flash {
  0% {
    filter: brightness(2) drop-shadow(0 0 20px var(--gold));
  }
  50% {
    filter: brightness(1.5) drop-shadow(0 0 30px var(--gold));
  }
  100% {
    filter: brightness(1) drop-shadow(0 0 0 transparent);
  }
}

.card-quote.animate-in {
  animation: quoteFadeIn 0.5s ease-out;
}

@keyframes quoteFadeIn {
  0% {
    opacity: 0;
    transform: translateY(20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

.card-category.animate-in {
  animation: categorySlide 0.4s ease-out;
}

@keyframes categorySlide {
  0% {
    opacity: 0;
    transform: translateX(-30px);
  }
  100% {
    opacity: 1;
    transform: translateX(0);
  }
}

.card-number.animate-in {
  animation: numberPop 0.4s ease-out;
}

@keyframes numberPop {
  0% {
    opacity: 0;
    transform: scale(0.5);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    opacity: 0.6;
    transform: scale(1);
  }
}