/* ===== CSS Variables & Reset ===== */
:root {
  --bg-primary: #0a0a1a;
  --bg-secondary: #12122a;
  --glass-bg: rgba(255,255,255,0.04);
  --glass-border: rgba(255,255,255,0.08);
  --accent: #d4a843;
  --accent-glow: rgba(212,168,67,0.3);
  --accent2: #b8860b;
  --correct: #2ecc71;
  --correct-glow: rgba(46,204,113,0.3);
  --wrong: #e74c3c;
  --wrong-glow: rgba(231,76,60,0.3);
  --text: #f0ece2;
  --text-dim: #8a8a9a;
  --text-muted: #5a5a6a;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --font-body: 'Inter', sans-serif;
  --font-display: 'Playfair Display', serif;
}

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

body {
  font-family: var(--font-body);
  background: linear-gradient(135deg, var(--bg-primary) 0%, #1a0a2e 50%, var(--bg-secondary) 100%);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ===== App Container ===== */
.app-container {
  max-width: 640px;
  margin: 0 auto;
  padding: 20px 16px;
  min-height: 100vh;
  position: relative;
}

/* ===== Screens ===== */
.screen {
  display: none;
  animation: fadeSlideIn 0.4s ease;
}
.screen.active { display: block; }

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

/* ===== Glass Card ===== */
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 32px 24px;
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
}

/* ===== Start Screen ===== */
.start-card { text-align: center; margin-top: 15vh; }
.logo { margin-bottom: 36px; }
.logo-icon { font-size: 64px; display:block; margin-bottom:12px; animation: float 3s ease-in-out infinite; }
@keyframes float {
  0%,100% { transform:translateY(0); }
  50% { transform:translateY(-10px); }
}
.logo h1 {
  font-family: var(--font-display);
  font-size: 2.4rem;
  background: linear-gradient(135deg, var(--accent), #f0d78c);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.tagline { color: var(--text-dim); margin-top:8px; font-size:0.95rem; letter-spacing:1px; }

/* ===== Form ===== */
.form-group { margin-bottom: 20px; text-align:left; }
.form-group label { display:block; margin-bottom:8px; color:var(--text-dim); font-size:0.85rem; font-weight:500; text-transform:uppercase; letter-spacing:1px; }
input[type="text"] {
  width:100%;
  padding:14px 18px;
  border:1px solid var(--glass-border);
  border-radius:var(--radius-sm);
  background:rgba(255,255,255,0.06);
  color:var(--text);
  font-size:1rem;
  font-family:var(--font-body);
  outline:none;
  transition:border-color 0.3s, box-shadow 0.3s;
}
input[type="text"]:focus {
  border-color:var(--accent);
  box-shadow:0 0 0 3px var(--accent-glow);
}
input::placeholder { color:var(--text-muted); }

/* ===== Buttons ===== */
.btn {
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:14px 28px;
  border:none; border-radius:var(--radius-sm);
  font-size:1rem; font-weight:600; font-family:var(--font-body);
  cursor:pointer;
  transition:all 0.3s ease;
  width:100%;
  margin-bottom:10px;
}
.btn-primary {
  background:linear-gradient(135deg, var(--accent), var(--accent2));
  color:#1a1a2e;
  box-shadow:0 4px 15px var(--accent-glow);
}
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 6px 20px var(--accent-glow); }
.btn-primary:disabled { opacity:0.4; cursor:not-allowed; transform:none; }
.btn-ghost {
  background:transparent;
  color:var(--text-dim);
  border:1px solid var(--glass-border);
}
.btn-ghost:hover { background:rgba(255,255,255,0.05); color:var(--text); }
.btn-danger {
  background:rgba(231,76,60,0.15);
  color:var(--wrong);
  border:1px solid rgba(231,76,60,0.3);
}
.btn-danger:hover { background:rgba(231,76,60,0.25); }
.btn-row { display:flex; gap:12px; }
.btn-row .btn { flex:1; }

/* ===== Settings ===== */
.settings-card h2 { font-family:var(--font-display); text-align:center; margin-bottom:28px; font-size:1.6rem; }
.setting-group { margin-bottom:24px; }
.setting-group > label { display:block; margin-bottom:12px; color:var(--text-dim); font-size:0.85rem; font-weight:600; text-transform:uppercase; letter-spacing:1px; }
.option-buttons { display:flex; gap:8px; flex-wrap:wrap; }
.category-grid { display:grid; grid-template-columns:repeat(3,1fr); }
.opt-btn {
  flex:1; min-width:0;
  padding:10px 6px;
  border:1px solid var(--glass-border);
  border-radius:var(--radius-sm);
  background:rgba(255,255,255,0.03);
  color:var(--text-dim);
  font-size:0.85rem; font-weight:500; font-family:var(--font-body);
  cursor:pointer;
  transition:all 0.25s ease;
  text-align:center;
}
.opt-btn:hover { border-color:var(--accent); color:var(--text); }
.opt-btn.selected {
  background:linear-gradient(135deg, rgba(212,168,67,0.2), rgba(184,134,11,0.15));
  border-color:var(--accent);
  color:var(--accent);
  box-shadow:0 0 12px var(--accent-glow);
}

/* ===== Quiz ===== */
.quiz-header { margin-bottom:16px; }
.progress-info { display:flex; justify-content:space-between; margin-bottom:8px; font-size:0.9rem; color:var(--text-dim); }
.progress-bar { height:4px; background:rgba(255,255,255,0.08); border-radius:2px; overflow:hidden; }
.progress-fill { height:100%; background:linear-gradient(90deg,var(--accent),#f0d78c); border-radius:2px; transition:width 0.5s ease; width:0%; }

.quiz-card { margin-bottom:20px; }
.quiz-question { text-align:center; font-family:var(--font-display); font-size:1.2rem; margin-bottom:24px; color:var(--accent); }

.notes-section { display:flex; flex-direction:column; gap:20px; }
.note-group h4 { font-size:0.8rem; color:var(--text-muted); margin-bottom:10px; text-transform:uppercase; letter-spacing:1px; }
.note-badges { display:flex; flex-wrap:wrap; gap:8px; }
.note-badge {
  display:inline-flex; align-items:center; gap:4px;
  padding:6px 12px;
  background:rgba(255,255,255,0.06);
  border:1px solid var(--glass-border);
  border-radius:20px;
  font-size:0.82rem;
  color:var(--text);
  line-height:1.3;
  animation:badgePop 0.3s ease backwards;
}
@keyframes badgePop {
  from { opacity:0; transform:scale(0.8); }
  to { opacity:1; transform:scale(1); }
}
.note-badge .note-emoji { font-size:1rem; }
.note-badge .note-text { display:flex; flex-direction:column; }
.note-badge .note-ko { font-weight:500; }
.note-badge .note-en { font-size:0.72rem; color:var(--text-muted); }

/* ===== Choices ===== */
.choices { display:flex; flex-direction:column; gap:10px; }
.choice-btn {
  display:flex; align-items:center; gap:12px;
  width:100%;
  padding:16px 20px;
  background:var(--glass-bg);
  border:1px solid var(--glass-border);
  border-radius:var(--radius-sm);
  color:var(--text);
  font-size:0.95rem; font-family:var(--font-body);
  cursor:pointer;
  transition:all 0.25s ease;
  text-align:left;
  backdrop-filter:blur(10px);
}
.choice-btn:hover { border-color:var(--accent); background:rgba(212,168,67,0.08); transform:translateX(4px); }
.choice-btn .choice-label { font-weight:700; color:var(--accent); min-width:28px; font-size:1.1rem; }
.choice-btn .choice-brand { color:var(--text-dim); font-size:0.82rem; }
.choice-btn .choice-name { font-weight:600; }
.choice-btn.correct {
  border-color:var(--correct);
  background:rgba(46,204,113,0.15);
  box-shadow:0 0 20px var(--correct-glow);
}
.choice-btn.wrong {
  border-color:var(--wrong);
  background:rgba(231,76,60,0.15);
  box-shadow:0 0 20px var(--wrong-glow);
}
.choice-btn.disabled { pointer-events:none; opacity:0.5; }

/* ===== Feedback Overlay ===== */
.feedback-overlay {
  display:none;
  position:fixed; inset:0;
  background:rgba(0,0,0,0.7);
  backdrop-filter:blur(5px);
  z-index:100;
  justify-content:center; align-items:center;
  padding:20px;
  animation:fadeIn 0.3s ease;
}
.feedback-overlay.active { display:flex; }
@keyframes fadeIn { from{opacity:0;} to{opacity:1;} }

.feedback-card {
  max-width:400px; width:100%;
  text-align:center;
  animation:scaleIn 0.3s ease;
}
@keyframes scaleIn { from{transform:scale(0.9);opacity:0;} to{transform:scale(1);opacity:1;} }
.feedback-icon { font-size:64px; margin-bottom:16px; }
.feedback-card h3 { font-family:var(--font-display); font-size:1.4rem; margin-bottom:8px; }
.feedback-card p { color:var(--text-dim); margin-bottom:20px; font-size:0.9rem; }
.feedback-card .btn { width:auto; padding:12px 32px; margin:0 auto; }
.feedback-card.correct-card h3 { color:var(--correct); }
.feedback-card.wrong-card h3 { color:var(--wrong); }

/* ===== Result ===== */
.result-card { text-align:center; margin-top:5vh; }
.result-card h2 { font-family:var(--font-display); font-size:1.8rem; margin-bottom:24px; }
.score-circle {
  width:140px; height:140px;
  border-radius:50%;
  border:4px solid var(--accent);
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  margin:0 auto 16px;
  box-shadow:0 0 30px var(--accent-glow);
}
.score-number { font-family:var(--font-display); font-size:3rem; font-weight:700; color:var(--accent); }
.score-total { color:var(--text-dim); font-size:1rem; }
.score-rate { color:var(--text-dim); margin-bottom:24px; font-size:1.1rem; }

.wrong-answers { text-align:left; margin-bottom:24px; }
.wrong-answers h3 { font-size:1rem; margin-bottom:16px; color:var(--text-dim); }
.wrong-item {
  background:rgba(231,76,60,0.08);
  border:1px solid rgba(231,76,60,0.2);
  border-radius:var(--radius-sm);
  padding:14px;
  margin-bottom:10px;
}
.wrong-item .wrong-q { font-weight:600; margin-bottom:6px; font-size:0.9rem; }
.wrong-item .wrong-your { color:var(--wrong); font-size:0.85rem; }
.wrong-item .wrong-correct { color:var(--correct); font-size:0.85rem; }

/* ===== Records ===== */
.records-card { margin-top:5vh; }
.records-card h2 { font-family:var(--font-display); text-align:center; font-size:1.6rem; margin-bottom:20px; }
.table-wrapper { overflow-x:auto; margin-bottom:20px; }
table { width:100%; border-collapse:collapse; font-size:0.85rem; }
th { background:rgba(212,168,67,0.1); color:var(--accent); padding:10px 8px; text-align:left; font-weight:600; white-space:nowrap; }
td { padding:10px 8px; border-bottom:1px solid var(--glass-border); color:var(--text-dim); white-space:nowrap; }
tr:hover td { background:rgba(255,255,255,0.03); }
.no-records { text-align:center; color:var(--text-muted); padding:40px 0; display:none; }

/* ===== Share Section ===== */
.share-section { margin-bottom:28px; }
.share-section h3 { font-size:1rem; margin-bottom:16px; color:var(--text-dim); }

/* 토스 스타일 공유 프리뷰 카드 */
.share-preview-card {
  background: linear-gradient(145deg, #1e1533 0%, #2a1a40 50%, #1a1230 100%);
  border:1px solid rgba(212,168,67,0.25);
  border-radius:16px;
  padding:24px 20px;
  text-align:center;
  margin-bottom:16px;
  position:relative;
  overflow:hidden;
}
.share-preview-card::before {
  content:'';
  position:absolute; top:-50%; left:-50%; width:200%; height:200%;
  background:radial-gradient(circle at 30% 20%, rgba(212,168,67,0.08) 0%, transparent 50%);
  pointer-events:none;
}
.share-card-header {
  font-size:0.85rem;
  color:var(--accent);
  letter-spacing:2px;
  margin-bottom:16px;
  font-weight:600;
}
.share-card-score {
  font-family:var(--font-display);
  font-size:2.8rem;
  font-weight:700;
  color:var(--text);
  margin-bottom:12px;
  line-height:1;
}
.share-card-gauge {
  width:80%;
  height:8px;
  background:rgba(255,255,255,0.08);
  border-radius:4px;
  margin:0 auto 14px;
  overflow:hidden;
}
.share-gauge-fill {
  height:100%;
  border-radius:4px;
  background:linear-gradient(90deg, var(--accent), #f0d78c, var(--correct));
  transition:width 1s ease;
  width:0%;
}
.share-card-msg {
  font-size:1.05rem;
  font-weight:600;
  color:var(--text);
  margin-bottom:6px;
}
.share-card-detail {
  font-size:0.82rem;
  color:var(--text-dim);
}

/* 공유 버튼 그룹 */
.share-buttons { display:flex; gap:10px; }
.share-btn {
  flex:1;
  display:flex; align-items:center; justify-content:center; gap:6px;
  padding:12px 8px;
  border-radius:var(--radius-sm);
  border:none;
  font-size:0.85rem; font-weight:600; font-family:var(--font-body);
  cursor:pointer;
  transition:all 0.25s ease;
}
.share-btn:hover { transform:translateY(-2px); }
.kakao-btn { background:#FEE500; color:#3C1E1E; }
.kakao-btn:hover { box-shadow:0 4px 15px rgba(254,229,0,0.35); }
.chat-link-btn {
  background:linear-gradient(135deg, rgba(254,229,0,0.15), rgba(254,229,0,0.08));
  color:#FEE500;
  border:1px solid rgba(254,229,0,0.25) !important;
  text-decoration:none;
}
.chat-link-btn:hover { background:linear-gradient(135deg, rgba(254,229,0,0.25), rgba(254,229,0,0.12)); box-shadow:0 4px 15px rgba(254,229,0,0.15); }
.chat-link-btn .kakao-icon path { fill:#FEE500; }
.twitter-btn { background:#1a1a2e; color:var(--text); border:1px solid var(--glass-border) !important; }
.twitter-btn:hover { background:#2a2a3e; box-shadow:0 4px 15px rgba(255,255,255,0.1); }
.copy-btn { background:rgba(255,255,255,0.08); color:var(--text-dim); border:1px solid var(--glass-border) !important; }
.copy-btn:hover { background:rgba(255,255,255,0.12); color:var(--text); }
.copy-btn.copied { background:rgba(46,204,113,0.15); color:var(--correct); border-color:rgba(46,204,113,0.3) !important; }

/* 카카오 오픈채팅 링크 */
.kakao-chat-link {
  display:flex; align-items:center; justify-content:center; gap:8px;
  margin-top:16px;
  padding:12px 16px;
  background:linear-gradient(135deg, rgba(254,229,0,0.12), rgba(254,229,0,0.06));
  border:1px solid rgba(254,229,0,0.2);
  border-radius:var(--radius-sm);
  color:#FEE500;
  font-size:0.85rem; font-weight:500;
  text-decoration:none;
  transition:all 0.3s ease;
}
.kakao-chat-link:hover {
  background:linear-gradient(135deg, rgba(254,229,0,0.2), rgba(254,229,0,0.1));
  transform:translateY(-1px);
  box-shadow:0 4px 12px rgba(254,229,0,0.15);
}
.kakao-icon { flex-shrink:0; }
.kakao-icon path { fill:#FEE500; }
.result-chat-link { margin-top:20px; margin-bottom:0; }

/* ===== Toast Notification ===== */
.toast {
  position:fixed;
  bottom:30px; left:50%; transform:translateX(-50%) translateY(100px);
  background:rgba(46,204,113,0.95);
  color:#fff;
  padding:12px 24px;
  border-radius:var(--radius-sm);
  font-size:0.9rem; font-weight:600;
  z-index:200;
  opacity:0;
  transition:all 0.4s ease;
  pointer-events:none;
}
.toast.show { transform:translateX(-50%) translateY(0); opacity:1; }

/* ===== Responsive ===== */
@media (max-width:480px) {
  .app-container { padding:12px; }
  .glass-card { padding:24px 16px; }
  .logo h1 { font-size:1.8rem; }
  .category-grid { grid-template-columns:repeat(2,1fr); }
  .opt-btn { padding:8px 4px; font-size:0.8rem; }
  .note-badge { padding:5px 8px; font-size:0.78rem; }
  .share-buttons { flex-direction:column; }
  .share-card-score { font-size:2.2rem; }
}