/* Shared styles for Nibbles learning units (lessons, quizzes, progress). */

:root {
  --bg: #07091a;
  --bg2: #0d1126;
  --card: rgba(255,255,255,0.04);
  --card-hover: rgba(255,255,255,0.07);
  --border: rgba(255,255,255,0.07);
  --border2: rgba(255,255,255,0.13);
  --text: #f1f5f9;
  --text2: #94a3b8;
  --text3: #475569;
  --purple: #8b5cf6;
  --purple2: #6d28d9;
  --cyan: #06b6d4;
  --green: #10b981;
  --green2: #065f46;
  --red: #ef4444;
  --red2: #7f1d1d;
  --amber: #f59e0b;
  --nav-h: 68px;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',system-ui,sans-serif;
  background:var(--bg);
  color:var(--text);
  min-height:100vh;
  max-width:480px;
  margin:0 auto;
  position:relative;
  overflow-x:hidden;
}
button{cursor:pointer;border:none;outline:none;font-family:inherit}
input{font-family:inherit}

/* ─── SCREENS ─────────────────────────────── */
.screen{
  min-height:100vh;
  padding-bottom:calc(var(--nav-h) + 12px);
  animation:fadeIn .25s ease;
}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
@keyframes slideUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
@keyframes pop{0%{transform:scale(.85)}60%{transform:scale(1.08)}100%{transform:scale(1)}}
@keyframes confettiDrop{
  0%{transform:translateY(-20px) rotate(0deg);opacity:1}
  100%{transform:translateY(120vh) rotate(720deg);opacity:0}
}
@keyframes shimmer{
  0%{background-position:-400px 0}
  100%{background-position:400px 0}
}
@keyframes pulse{
  0%,100%{transform:scale(1)}
  50%{transform:scale(1.05)}
}

/* ─── HEADER ──────────────────────────────── */
.header{
  padding:20px 20px 0;
  display:flex;
  align-items:center;
  justify-content:space-between;
  position:sticky;
  top:0;
  z-index:10;
  background:linear-gradient(var(--bg) 85%, transparent);
  padding-bottom:12px;
}
.logo{
  font-size:22px;
  font-weight:800;
  background:linear-gradient(135deg,#8b5cf6,#06b6d4);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
  letter-spacing:-0.5px;
}
.header-stats{
  display:flex;
  gap:10px;
  align-items:center;
}
.stat-pill{
  display:flex;
  align-items:center;
  gap:5px;
  background:var(--card);
  border:1px solid var(--border2);
  padding:5px 12px;
  border-radius:20px;
  font-size:13px;
  font-weight:600;
}
.stat-pill .icon{font-size:15px}

/* ─── HOME SCREEN ─────────────────────────── */
.home-hero{
  padding:24px 20px 20px;
  text-align:center;
}
.home-hero h1{
  font-size:26px;
  font-weight:800;
  line-height:1.25;
  margin-bottom:8px;
}
.home-hero p{
  color:var(--text2);
  font-size:14px;
  line-height:1.6;
}
.gradient-text{
  background:linear-gradient(135deg,#8b5cf6 0%,#06b6d4 60%,#10b981 100%);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
}

.section-label{
  padding:0 20px;
  margin-bottom:12px;
  font-size:11px;
  font-weight:700;
  letter-spacing:1.5px;
  color:var(--text3);
  text-transform:uppercase;
}

/* ─── MODULE CARDS ────────────────────────── */
.modules-list{padding:0 16px;display:flex;flex-direction:column;gap:12px;margin-bottom:20px}
.module-card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:20px;
  overflow:hidden;
  cursor:pointer;
  transition:all .2s ease;
  position:relative;
}
.module-card:active{transform:scale(.97)}
.module-card:hover{background:var(--card-hover);border-color:var(--border2)}
.module-card-inner{padding:18px}
.module-card-top{
  display:flex;
  align-items:flex-start;
  gap:14px;
  margin-bottom:14px;
}
.module-emoji-wrap{
  width:52px;height:52px;
  border-radius:16px;
  display:flex;align-items:center;justify-content:center;
  font-size:26px;
  flex-shrink:0;
}
.module-meta{flex:1}
.module-title{font-size:16px;font-weight:700;margin-bottom:3px}
.module-desc{font-size:12px;color:var(--text2);line-height:1.5}
.module-lock{
  width:32px;height:32px;
  display:flex;align-items:center;justify-content:center;
  font-size:18px;
  opacity:.5;
}

.module-footer{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
}
.progress-bar-wrap{flex:1}
.progress-bar-track{
  height:6px;
  background:rgba(255,255,255,0.08);
  border-radius:10px;
  overflow:hidden;
}
.progress-bar-fill{
  height:100%;
  border-radius:10px;
  transition:width .5s ease;
}
.progress-text{font-size:11px;color:var(--text2);margin-top:5px}
.module-badge{
  font-size:11px;font-weight:700;
  padding:4px 10px;
  border-radius:20px;
  white-space:nowrap;
}
.badge-locked{background:rgba(255,255,255,.06);color:var(--text3)}
.badge-start{background:rgba(139,92,246,.15);color:#a78bfa}
.badge-continue{background:rgba(6,182,212,.12);color:#22d3ee}
.badge-done{background:rgba(16,185,129,.12);color:#34d399}

/* ─── LESSON SCREEN ───────────────────────── */
.lesson-header{
  padding:16px 20px;
  display:flex;
  align-items:center;
  gap:14px;
}
.back-btn{
  width:36px;height:36px;
  background:var(--card);
  border:1px solid var(--border2);
  border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  font-size:18px;
  flex-shrink:0;
  cursor:pointer;
  transition:.15s;
}
.back-btn:active{transform:scale(.9)}
.lesson-progress-bar{
  flex:1;
  height:8px;
  background:rgba(255,255,255,.08);
  border-radius:10px;
  overflow:hidden;
}
.lesson-progress-fill{
  height:100%;
  border-radius:10px;
  transition:width .4s cubic-bezier(.34,1.56,.64,1);
}
.lesson-step{
  font-size:12px;
  color:var(--text2);
  white-space:nowrap;
  font-weight:600;
}

/* ─── CONTENT CARD ────────────────────────── */
.card-container{
  padding:10px 16px 20px;
  display:flex;
  flex-direction:column;
  gap:14px;
}
.content-card{
  background:var(--card);
  border:1px solid var(--border2);
  border-radius:24px;
  overflow:hidden;
  animation:slideUp .3s ease;
}
.card-band{
  height:5px;
  width:100%;
}
.card-body{padding:22px 20px}
.card-eyebrow{
  font-size:10px;
  font-weight:700;
  letter-spacing:1.5px;
  text-transform:uppercase;
  color:var(--text3);
  margin-bottom:14px;
}
.card-icon{
  font-size:48px;
  text-align:center;
  margin-bottom:16px;
  display:block;
  animation:pop .4s ease .1s both;
}
.card-title{
  font-size:20px;
  font-weight:800;
  line-height:1.3;
  margin-bottom:12px;
}
.card-text{
  font-size:14px;
  line-height:1.7;
  color:var(--text2);
}
.card-text strong{color:var(--text);font-weight:600}
.card-text em{
  background:rgba(139,92,246,.15);
  color:#c4b5fd;
  padding:1px 6px;
  border-radius:5px;
  font-style:normal;
}

.analogy-box{
  margin-top:16px;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.08);
  border-left:3px solid var(--purple);
  border-radius:12px;
  padding:14px;
}
.analogy-label{
  font-size:10px;
  font-weight:700;
  letter-spacing:1.5px;
  text-transform:uppercase;
  color:#a78bfa;
  margin-bottom:6px;
}
.analogy-text{font-size:13px;color:var(--text2);line-height:1.6}
.analogy-text strong{color:#c4b5fd}

.example-box{
  margin-top:16px;
  background:rgba(6,182,212,.06);
  border:1px solid rgba(6,182,212,.15);
  border-radius:12px;
  padding:14px;
}
.example-label{
  font-size:10px;
  font-weight:700;
  letter-spacing:1.5px;
  text-transform:uppercase;
  color:#22d3ee;
  margin-bottom:6px;
}
.example-text{font-size:13px;color:#a5f3fc;line-height:1.6}

.key-points{margin-top:16px;display:flex;flex-direction:column;gap:8px}
.key-point{
  display:flex;
  align-items:flex-start;
  gap:10px;
  background:rgba(255,255,255,.03);
  border:1px solid var(--border);
  border-radius:12px;
  padding:12px;
}
.key-point-icon{font-size:18px;flex-shrink:0;margin-top:1px}
.key-point-text{font-size:13px;color:var(--text2);line-height:1.5}
.key-point-text strong{color:var(--text)}

/* comparison table */
.compare-table{margin-top:16px;display:flex;flex-direction:column;gap:8px}
.compare-row{
  display:grid;
  grid-template-columns:1fr 1fr 1fr;
  gap:6px;
  align-items:stretch;
}
.compare-cell{
  background:rgba(255,255,255,.04);
  border:1px solid var(--border);
  border-radius:10px;
  padding:10px 8px;
  font-size:12px;
  text-align:center;
  line-height:1.4;
}
.compare-header .compare-cell{
  font-weight:700;
  font-size:11px;
  letter-spacing:.5px;
  color:var(--text2);
  background:transparent;
  border-color:transparent;
}

/* ─── NAV BUTTON ──────────────────────────── */
.nav-btn-wrap{padding:0 16px;margin-top:4px}
.nav-btn{
  width:100%;
  padding:16px;
  border-radius:18px;
  font-size:16px;
  font-weight:700;
  color:#fff;
  transition:all .2s ease;
  position:relative;
  overflow:hidden;
}
.nav-btn:active{transform:scale(.97)}
.nav-btn:disabled{opacity:.4;pointer-events:none}
.nav-btn::after{
  content:'';
  position:absolute;
  inset:0;
  background:rgba(255,255,255,.12);
  opacity:0;
  transition:.2s;
}
.nav-btn:hover::after{opacity:1}

/* ─── QUIZ SCREEN ─────────────────────────── */
.quiz-container{padding:10px 16px 20px}
.quiz-question-card{
  background:var(--card);
  border:1px solid var(--border2);
  border-radius:24px;
  padding:24px 20px;
  margin-bottom:14px;
  animation:slideUp .3s ease;
}
.quiz-q-num{
  font-size:10px;
  font-weight:700;
  letter-spacing:1.5px;
  text-transform:uppercase;
  color:var(--text3);
  margin-bottom:14px;
}
.quiz-q-icon{font-size:36px;margin-bottom:14px;display:block;animation:pop .4s ease}
.quiz-question{font-size:17px;font-weight:700;line-height:1.4;color:var(--text)}

.options-list{display:flex;flex-direction:column;gap:8px}
.option-btn{
  width:100%;
  text-align:left;
  padding:14px 16px;
  background:var(--card);
  border:1px solid var(--border2);
  border-radius:16px;
  font-size:14px;
  font-weight:500;
  color:var(--text);
  display:flex;
  align-items:center;
  gap:12px;
  transition:all .2s ease;
  cursor:pointer;
}
.option-btn:active{transform:scale(.97)}
.option-btn:hover{background:var(--card-hover);border-color:rgba(255,255,255,.2)}
.option-letter{
  width:28px;height:28px;
  border-radius:9px;
  background:rgba(255,255,255,.08);
  display:flex;align-items:center;justify-content:center;
  font-size:12px;
  font-weight:700;
  flex-shrink:0;
  transition:.2s;
}
.option-btn.correct{
  background:rgba(16,185,129,.1);
  border-color:rgba(16,185,129,.4);
}
.option-btn.correct .option-letter{
  background:#10b981;
  color:#fff;
}
.option-btn.wrong{
  background:rgba(239,68,68,.1);
  border-color:rgba(239,68,68,.4);
}
.option-btn.wrong .option-letter{
  background:#ef4444;
  color:#fff;
}
.option-btn.disabled{pointer-events:none;opacity:.5}
.option-btn.correct,.option-btn.wrong{animation:pop .3s ease}

.quiz-feedback{
  background:rgba(255,255,255,.04);
  border:1px solid var(--border2);
  border-radius:16px;
  padding:14px;
  font-size:13px;
  color:var(--text2);
  line-height:1.6;
  animation:slideUp .3s ease;
}
.quiz-feedback.correct-fb{border-color:rgba(16,185,129,.3);background:rgba(16,185,129,.06)}
.quiz-feedback.wrong-fb{border-color:rgba(239,68,68,.25);background:rgba(239,68,68,.05)}
.feedback-header{
  font-size:15px;
  font-weight:700;
  margin-bottom:6px;
}
.feedback-correct{color:#34d399}
.feedback-wrong{color:#f87171}

/* ─── COMPLETE SCREEN ─────────────────────── */
.complete-screen{
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  min-height:100vh;
  padding:40px 20px;
  text-align:center;
  gap:20px;
}
.complete-trophy{font-size:72px;animation:pop .5s ease}
.complete-title{font-size:28px;font-weight:800;line-height:1.2}
.complete-sub{font-size:15px;color:var(--text2);line-height:1.6}
.score-card{
  width:100%;
  background:var(--card);
  border:1px solid var(--border2);
  border-radius:24px;
  padding:20px;
  display:flex;
  justify-content:space-around;
}
.score-item{text-align:center}
.score-val{font-size:28px;font-weight:800}
.score-lbl{font-size:11px;color:var(--text2);margin-top:4px;font-weight:600;letter-spacing:.5px}

/* ─── BOTTOM NAV ──────────────────────────── */
.bottom-nav{
  position:fixed;
  bottom:0;left:50%;transform:translateX(-50%);
  width:100%;max-width:480px;
  height:var(--nav-h);
  background:rgba(7,9,26,.95);
  backdrop-filter:blur(20px);
  border-top:1px solid var(--border);
  display:flex;
  align-items:center;
  justify-content:space-around;
  padding:0 10px;
  z-index:100;
}
.nav-item{
  flex:1;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:3px;
  padding:6px;
  cursor:pointer;
  border-radius:14px;
  transition:.15s;
  background:none;
  color:var(--text3);
}
.nav-item.active{color:var(--purple)}
.nav-item:active{transform:scale(.9)}
.nav-icon{font-size:22px;transition:.2s}
.nav-item.active .nav-icon{transform:scale(1.15)}
.nav-label{font-size:10px;font-weight:600;letter-spacing:.3px}

/* ─── PROGRESS SCREEN ─────────────────────── */
.progress-screen{padding:24px 16px 0}
.progress-screen h2{font-size:22px;font-weight:800;padding:0 4px;margin-bottom:20px}
.stats-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:10px;
  margin-bottom:20px;
}
.stats-card{
  background:var(--card);
  border:1px solid var(--border2);
  border-radius:20px;
  padding:18px;
  text-align:center;
}
.stats-card-val{font-size:32px;font-weight:800;margin-bottom:4px}
.stats-card-lbl{font-size:11px;color:var(--text2);font-weight:600;letter-spacing:.5px}
.lesson-list{display:flex;flex-direction:column;gap:8px}
.lesson-item{
  display:flex;align-items:center;gap:12px;
  background:var(--card);
  border:1px solid var(--border);
  border-radius:14px;
  padding:12px 14px;
}
.lesson-status{font-size:18px;width:32px;text-align:center}
.lesson-name{flex:1;font-size:13px;font-weight:600}
.lesson-mod{font-size:11px;color:var(--text3)}

/* ─── CONFETTI ────────────────────────────── */
.confetti-piece{
  position:fixed;
  width:8px;height:8px;
  border-radius:2px;
  z-index:9999;
  animation:confettiDrop linear forwards;
  pointer-events:none;
}

/* ─── MODULE DETAIL ───────────────────────── */
.module-detail{padding:16px}
.module-detail-header{
  display:flex;align-items:center;gap:14px;
  margin-bottom:20px;
}
.module-detail-emoji{
  width:60px;height:60px;
  border-radius:18px;
  display:flex;align-items:center;justify-content:center;
  font-size:30px;
}
.module-detail-title{font-size:22px;font-weight:800}
.module-detail-sub{font-size:13px;color:var(--text2);margin-top:3px}
.lesson-cards{display:flex;flex-direction:column;gap:8px}
.lesson-card{
  display:flex;align-items:center;gap:14px;
  background:var(--card);
  border:1px solid var(--border);
  border-radius:16px;
  padding:14px 16px;
  cursor:pointer;
  transition:.15s;
}
.lesson-card:active{transform:scale(.97)}
.lesson-card:hover{background:var(--card-hover)}
.lesson-card.locked{opacity:.4;pointer-events:none}
.lesson-num{
  width:36px;height:36px;
  border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  font-size:15px;
  font-weight:700;
  flex-shrink:0;
}
.lesson-info{flex:1}
.lesson-title{font-size:14px;font-weight:700}
.lesson-detail{font-size:11px;color:var(--text2);margin-top:2px}
.lesson-arrow{color:var(--text3);font-size:16px}
.lesson-done-badge{
  font-size:18px;
}