:root {
  --bg: #0F1117;
  --accent: #4ADE80;
  --accent-hover: #3CC46E;
  --text: #E8E8E8;
  --text-sub: #9CA3AF;
  --sub: #4ADE80;
  --sub-hover: #3CC46E;
  --card: #1A1D27;
  --card-shadow: 0 2px 16px rgba(0, 0, 0, 0.3);
  --card-border: #2A2D37;
  --radius: 16px;
  --font-title: 'Jua', sans-serif;
  --font-body: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
}

.screen {
  display: none;
  min-height: 100dvh;
  justify-content: center;
  align-items: center;
  padding: 24px 20px;
}

.screen.active {
  display: flex;
}

.container {
  width: 100%;
  max-width: 420px;
  text-align: center;
}

/* ===== Intro Screen ===== */
#screen-intro .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.intro-badge {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--accent);
  background: rgba(74, 222, 128, 0.1);
  border: 1px solid rgba(74, 222, 128, 0.25);
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 8px;
}

.title {
  font-family: var(--font-title);
  font-size: 3.4rem;
  color: var(--accent);
  letter-spacing: -1px;
}

.subtitle {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-sub);
  margin-bottom: 8px;
}

.intro-carousel {
  width: 100%;
  overflow: hidden;
  margin: 20px 0 28px;
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 20%, black 80%, transparent 100%);
  mask-image: linear-gradient(to right, transparent 0%, black 20%, black 80%, transparent 100%);
}

.carousel-track {
  display: flex;
  gap: 16px;
  animation: carouselSlide 40s linear infinite;
  width: max-content;
}

.carousel-item {
  width: 80px;
  height: 80px;
  flex-shrink: 0;
  object-fit: contain;
  border-radius: 50%;
  background: var(--card);
  border: 2px solid var(--card-border);
  padding: 8px;
}

@keyframes carouselSlide {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.intro-footer {
  font-size: 0.8rem;
  color: var(--text-sub);
  margin-top: 24px;
  opacity: 0.5;
}

.intro-footer strong {
  color: var(--accent);
  opacity: 1;
}

.btn-primary {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 600;
  padding: 16px 48px;
  border: none;
  border-radius: var(--radius);
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-primary:active {
  transform: scale(0.97);
}

/* ===== Question Screen ===== */
.progress-bar {
  width: 100%;
  height: 8px;
  background: #2A2D37;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 4px;
  transition: width 0.4s ease;
}

.progress-text {
  font-size: 0.85rem;
  color: var(--text-sub);
  margin-bottom: 28px;
}

.btn-back {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-sub);
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  cursor: pointer;
  padding: 10px 24px;
  margin-top: 16px;
  transition: color 0.2s, border-color 0.2s;
}

.btn-back:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.question-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  border: 1px solid var(--card-border);
  padding: 32px 24px;
}

.question-text {
  font-family: var(--font-title);
  font-size: 1.3rem;
  line-height: 1.5;
  margin-bottom: 24px;
  word-break: keep-all;
}

.choices {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.btn-choice {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.5;
  padding: 16px 20px;
  border: 2px solid var(--card-border);
  border-radius: 12px;
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  text-align: left;
  word-break: keep-all;
  transition: border-color 0.2s, background 0.2s, transform 0.1s;
}

.btn-choice:hover {
  border-color: var(--accent);
  background: #1E2A22;
}

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

/* Slide animation */
.slide-in {
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ===== Result Screen ===== */
#screen-result .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.result-image {
  width: 220px;
  height: 220px;
  object-fit: contain;
  margin-bottom: 8px;
}

.result-code {
  font-family: var(--font-title);
  font-size: 2.4rem;
  color: var(--accent);
  letter-spacing: 4px;
}

.result-name {
  font-family: var(--font-title);
  font-size: 1.4rem;
  color: var(--text);
}

.result-subname {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-sub);
  letter-spacing: 1px;
}

.result-desc {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-sub);
  max-width: 320px;
  word-break: keep-all;
  margin-bottom: 16px;
}

.btn-share {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 14px 48px;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn-share:active {
  transform: scale(0.97);
}

.btn-copy {
  background: var(--sub);
  color: #fff;
}

.btn-copy:hover {
  background: var(--sub-hover);
}

.btn-retry {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--text-sub);
  background: none;
  border: none;
  cursor: pointer;
  margin-top: 12px;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.btn-retry:hover {
  color: var(--text);
}

.btn-try {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  padding: 14px 36px;
  border: none;
  border-radius: var(--radius);
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  margin-top: 8px;
  transition: background 0.2s, transform 0.1s;
}

.btn-try:hover {
  background: var(--accent-hover);
}

.btn-try:active {
  transform: scale(0.97);
}

/* ===== Desktop ===== */
@media (min-width: 481px) {
  .screen {
    padding: 40px 20px;
  }

  .btn-choice:hover {
    border-color: var(--accent);
    background: #1E2A22;
  }
}