:root{
  --ink:#1b2147;
  --ink-soft:#697493;
  --purple:#9245ff;
  --purple-2:#6f33f3;
  --blue:#2f6cff;
  --blue-2:#1d4ed8;
  --cyan:#1fc8bf;
  --teal:#0fb8ae;
  --yellow:#ffd229;
  --yellow-2:#ffbf1b;
  --bg:#f5f7fd;
  --bg-soft:#edf2fb;
  --card:#ffffff;
  --line:#e3e8f4;
  --success:#15af72;
  --danger:#e36372;
  --shadow:0 18px 42px rgba(34,49,109,.12);
  --shadow-soft:0 12px 28px rgba(34,49,109,.09);
  --radius-xl:28px;
  --radius-lg:22px;
  --radius-md:18px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:
    radial-gradient(circle at top left, rgba(146,69,255,.06), transparent 25%),
    radial-gradient(circle at top right, rgba(31,200,191,.05), transparent 20%),
    var(--bg);
  color:var(--ink);
  font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif;
}

h1,h2,h3,h4,.brand,.btn,.stat b,.section-heading h2,.lesson-panel .lesson-kicker{
  font-family:"Baloo 2",Inter,sans-serif;
}
button,input,textarea{font:inherit}
button{border:none}
.screen{display:none;min-height:100vh}
.screen.active{display:block}

/* HERO */
.hero{
  min-height:560px;
  display:flex;
  align-items:center;
  justify-content:center;
  text-align:center;
  background:
    radial-gradient(circle at 18% 20%, rgba(255,255,255,.12), transparent 16%),
    radial-gradient(circle at 78% 22%, rgba(255,255,255,.12), transparent 12%),
    radial-gradient(circle at 82% 80%, rgba(255,255,255,.10), transparent 14%),
    linear-gradient(115deg,#8f39ff 0%, #355fff 46%, #18c2ba 100%);
  color:white;
  position:relative;
  overflow:hidden;
  padding:74px 20px 72px;
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  background:
    radial-gradient(circle at 12% 26%, rgba(255,255,255,.06), transparent 18%),
    radial-gradient(circle at 30% 66%, rgba(255,255,255,.05), transparent 12%),
    radial-gradient(circle at 65% 32%, rgba(255,255,255,.05), transparent 10%),
    radial-gradient(circle at 90% 75%, rgba(255,255,255,.05), transparent 14%);
}
.hero::after{
  content:"";
  position:absolute;
  left:-8%;
  right:-8%;
  bottom:-135px;
  height:230px;
  border-radius:50%;
  background:rgba(255,255,255,.10);
}
.hero-inner{
  position:relative;
  z-index:2;
  max-width:820px;
}
.snake-logo{
  font-size:118px;
  line-height:1;
  filter:drop-shadow(0 14px 14px rgba(0,0,0,.18));
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:9px 15px;
  border-radius:999px;
  background:rgba(255,255,255,.14);
  border:1px solid rgba(255,255,255,.22);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.12);
  font-size:12px;
  letter-spacing:.12em;
  font-weight:800;
  text-transform:uppercase;
}
.hero h1{
  font-size:72px;
  line-height:.92;
  margin:12px 0 14px;
  font-weight:800;
}
.hero h1 span{
  display:block;
  color:#ffe23e;
  text-shadow:0 6px 16px rgba(255,226,62,.16);
}
.hero p{
  font-size:18px;
  line-height:1.65;
  max-width:700px;
  margin:0 auto 30px;
}
.hero-actions{
  display:flex;
  gap:16px;
  justify-content:center;
  flex-wrap:wrap;
}

.btn{
  border-radius:18px;
  padding:15px 26px;
  font-weight:800;
  cursor:pointer;
  transition:transform .18s ease, box-shadow .18s ease, opacity .18s ease, filter .18s ease;
}
.btn:hover{
  transform:translateY(-2px);
  filter:saturate(1.05);
}
.btn:disabled{
  opacity:.55;
  cursor:not-allowed;
  transform:none;
}
.btn-primary{
  background:linear-gradient(180deg,var(--yellow),var(--yellow-2));
  color:#2f2a14;
  box-shadow:0 14px 30px rgba(255,210,41,.30);
}
.btn-glass{
  background:rgba(255,255,255,.10);
  color:white;
  border:1px solid rgba(255,255,255,.42);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.12);
}
.btn-secondary{
  background:#eff3fb;
  color:#404868;
  box-shadow:var(--shadow-soft);
}

.floating-code{
  position:absolute;
  font-family:"Baloo 2";
  font-size:31px;
  opacity:.12;
  z-index:1;
}
.c1{left:5%;top:22%}
.c2{left:18%;bottom:18%}
.c3{right:24%;top:22%}
.c4{right:8%;bottom:25%}
.c5{left:38%;top:13%}

/* STRIP */
.stats-strip{
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(8px);
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:20px;
  padding:22px max(18px,calc((100vw - 840px)/2));
  box-shadow:0 4px 18px rgba(17,32,86,.06);
}
.stat{
  text-align:center;
  display:flex;
  flex-direction:column;
  gap:2px;
}
.stat>span{font-size:29px}
.stat b{font-size:21px;line-height:1}
.stat:nth-child(1) b{color:#7d35f2}
.stat:nth-child(2) b{color:#eba900}
.stat:nth-child(3) b{color:#089f95}
.stat small{color:var(--ink-soft);font-size:13px}

/* LAYOUT SECTIONS */
.preview-section,.games-section{
  padding:40px 24px 48px;
}
.preview-section{
  background:linear-gradient(180deg,#dde5f0 0%, #e8edf6 100%);
  padding-left:max(24px,calc((100vw - 860px)/2));
  padding-right:max(24px,calc((100vw - 860px)/2));
}
.preview-section .mission-grid{
  max-width:860px;
  margin:0 auto;
}
.games-section{
  max-width:none;
  background:#f8faff;
}
.games-section .game-types{
  max-width:980px;
  margin:0 auto;
}
.section-heading{
  text-align:center;
  margin-bottom:24px;
}
.section-heading.left{text-align:left}
.section-heading h2{
  margin:0;
  font-size:34px;
  color:#25264c;
}
.section-heading p{
  margin:2px 0 0;
  color:#6f7897;
}

/* MISSION CARDS */
.mission-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:18px;
}
.mission-card{
  position:relative;
  min-height:108px;
  border-radius:22px;
  padding:18px 18px 20px;
  color:#fff;
  overflow:hidden;
  box-shadow:0 18px 34px rgba(33,44,95,.16);
  transition:transform .18s ease, box-shadow .18s ease, filter .18s ease;
  border:2px solid rgba(255,255,255,.10);
  cursor:pointer;
}
.mission-card:hover{
  transform:translateY(-4px) scale(1.01);
  box-shadow:0 22px 42px rgba(33,44,95,.18);
}
.mission-card::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg, rgba(255,255,255,.10), transparent 40%);
  pointer-events:none;
}
.mission-card::after{
  content:"";
  position:absolute;
  width:130px;
  height:130px;
  right:-28px;
  bottom:-36px;
  border-radius:50%;
  background:rgba(255,255,255,.12);
}
.mission-card.locked{
  filter:saturate(.55);
  opacity:.72;
  cursor:not-allowed;
}
.mission-card.done{
  border-color:rgba(255,255,255,.55);
}
.mission-card .icon{
  font-size:34px;
  position:relative;
  z-index:2;
}
.mission-card h3{
  font-size:18px;
  line-height:1.08;
  margin:10px 0 0;
  position:relative;
  z-index:2;
}
.mission-card small{
  position:absolute;
  top:14px;
  right:14px;
  z-index:2;
  background:rgba(255,255,255,.22);
  border:1px solid rgba(255,255,255,.14);
  border-radius:999px;
  padding:3px 10px;
  font-size:12px;
}
.lock-symbol{
  position:absolute;
  left:50%;
  transform:translateX(-50%);
  bottom:18px;
  z-index:2;
  font-size:30px;
  opacity:.92;
}
.done-symbol{
  position:absolute;
  right:14px;
  bottom:12px;
  z-index:2;
  font-size:22px;
}
.m1{background:linear-gradient(135deg,#c45cff,#9438ff)}
.m2{background:linear-gradient(135deg,#30e6d8,#12beb6)}
.m3{background:linear-gradient(135deg,#ffa43f,#ff6a1b)}
.m4{background:linear-gradient(135deg,#d564a4,#aa3d84)}
.m5{background:linear-gradient(135deg,#6e98ee,#466bd2)}
.m6{background:linear-gradient(135deg,#4cc67f,#21965a)}
.m7{background:linear-gradient(135deg,#d5ba4b,#af8c1c)}
.m8{background:linear-gradient(135deg,#d4707a,#af4255)}
.m9{background:linear-gradient(135deg,#bc86d5,#9d4abe)}

/* GAME TYPES */
.game-types{
  display:grid;
  grid-template-columns:repeat(5,1fr);
  gap:14px;
}
.game-type{
  background:linear-gradient(180deg,#f4f3fc 0%, #eeeff9 100%);
  border:1px solid #dcdeef;
  border-radius:20px;
  padding:18px 12px;
  text-align:center;
  display:flex;
  flex-direction:column;
  gap:6px;
  box-shadow:var(--shadow-soft);
}
.game-type div{font-size:32px}
.game-type b{font-size:18px;color:#2a2d54}
.game-type span{font-size:12px;color:#7b84a1}

/* DASHBOARD */
.topbar{
  position:sticky;
  top:0;
  z-index:10;
  height:76px;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:0 26px;
}
.brand{
  font-size:23px;
  font-weight:800;
  display:flex;
  align-items:center;
  gap:10px;
  cursor:pointer;
}
.top-actions{
  display:flex;
  gap:12px;
  align-items:center;
}
.xp-pill{
  background:#fff7d7;
  border:1px solid #ffe899;
  color:#8a6b00;
  border-radius:999px;
  padding:9px 14px;
  font-weight:800;
  box-shadow:0 8px 18px rgba(255,232,153,.20);
}
.profile-mini{
  width:42px;
  height:42px;
  border-radius:14px;
  background:linear-gradient(135deg,#9050f5,#2f68ea);
  display:grid;
  place-items:center;
  color:#fff;
  font-weight:800;
  cursor:pointer;
  box-shadow:var(--shadow-soft);
}
.dashboard-main{
  max-width:1080px;
  margin:0 auto;
  padding:34px 24px 108px;
}
.welcome-card{
  display:grid;
  grid-template-columns:1.6fr .4fr;
  gap:20px;
  align-items:center;
  background:
    radial-gradient(circle at top right, rgba(146,69,255,.08), transparent 28%),
    linear-gradient(135deg,#ffffff 0%,#f7f9ff 55%,#eef5ff 100%);
  border:1px solid var(--line);
  border-radius:var(--radius-xl);
  padding:30px 32px;
  box-shadow:var(--shadow);
}
.badge-soft{
  display:inline-block;
  padding:7px 12px;
  border-radius:999px;
  background:#efe7ff;
  color:#6f2fd6;
  font-weight:800;
  font-size:13px;
}
.welcome-card h2{
  font-size:36px;
  margin:8px 0 4px;
}
.welcome-card p{
  color:#6a7492;
  margin:0 0 16px;
  max-width:620px;
}
.welcome-graphic{
  font-size:112px;
  text-align:center;
  filter:drop-shadow(0 8px 12px rgba(0,0,0,.06));
}
.progress-label{
  display:flex;
  justify-content:space-between;
  font-size:13px;
  margin-bottom:8px;
}
.progress-track{
  height:10px;
  border-radius:999px;
  background:#e7ebf5;
  overflow:hidden;
}
.progress-bar{
  height:100%;
  width:0;
  border-radius:999px;
  background:linear-gradient(90deg,#9143ff,#1fc8bf);
  transition:width .35s ease;
}
.continue-card{
  margin:22px 0;
  display:grid;
  grid-template-columns:auto 1fr auto;
  gap:18px;
  align-items:center;
  padding:21px 22px;
  border-radius:24px;
  background:
    radial-gradient(circle at right top, rgba(255,255,255,.08), transparent 20%),
    linear-gradient(135deg,#141d40,#1b2349 70%);
  color:white;
  box-shadow:var(--shadow);
}
.continue-icon{
  width:58px;
  height:58px;
  border-radius:18px;
  background:linear-gradient(135deg,#954dff,#2f6cff);
  display:grid;
  place-items:center;
  box-shadow:0 10px 20px rgba(52,88,230,.28);
}
.continue-copy small{
  opacity:.72;
  font-weight:800;
  letter-spacing:.08em;
}
.continue-copy h3{
  font-size:24px;
  margin:2px 0 4px;
}
.continue-copy p{
  margin:0;
  color:rgba(255,255,255,.76);
}
.dashboard-stats{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:14px;
  margin:22px 0 34px;
}
.dash-stat{
  display:flex;
  gap:12px;
  align-items:center;
  padding:17px 18px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:20px;
  box-shadow:var(--shadow-soft);
}
.dash-stat>span{font-size:28px}
.dash-stat b{display:block;font-size:22px}
.dash-stat small{color:#75809c}
.route{scroll-margin-top:92px}
.bottom-nav{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  z-index:12;
  height:74px;
  background:rgba(255,255,255,.96);
  backdrop-filter:blur(10px);
  border-top:1px solid var(--line);
  display:flex;
  justify-content:space-around;
  align-items:center;
}
.bottom-nav button{
  background:transparent;
  color:#717995;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:3px;
  cursor:pointer;
}
.bottom-nav button.active{color:#7d35f2}
.bottom-nav span{font-size:11px}

/* MISSION VIEW */
.mission-top{
  justify-content:flex-start;
  gap:14px;
}
.mission-top .xp-pill{margin-left:auto}
.back-btn{
  width:42px;
  height:42px;
  border-radius:14px;
  background:#eef2fb;
  color:#30395f;
  font-size:22px;
  cursor:pointer;
}
.mission-top-copy{
  display:flex;
  flex-direction:column;
}
.mission-top-copy small{
  color:#7b34f2;
  font-weight:800;
}
.mission-main{
  max-width:1180px;
  margin:0 auto;
  padding:28px 24px;
  display:grid;
  grid-template-columns:300px 1fr;
  gap:22px;
}
.mission-sidebar{
  position:sticky;
  top:98px;
  align-self:start;
  background:#fff;
  border:1px solid var(--line);
  border-radius:24px;
  padding:22px;
  box-shadow:var(--shadow-soft);
}
.mission-side-icon{font-size:54px}
.mission-sidebar h3{
  font-size:24px;
  margin:6px 0 18px;
}
.side-progress span{
  display:block;
  margin-bottom:8px;
  font-size:12px;
  color:#76819e;
}
.lesson-steps{
  margin-top:18px;
  display:flex;
  flex-direction:column;
  gap:9px;
}
.lesson-step{
  padding:11px 12px;
  border-radius:12px;
  color:#7c849c;
  font-size:13px;
}
.lesson-step.active{
  background:#eee6ff;
  color:#6928cb;
  font-weight:800;
}
.lesson-step.done{color:#138e61}
.lesson-panel{
  min-height:660px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:24px;
  padding:32px;
  box-shadow:var(--shadow-soft);
}
.lesson-panel h1{
  font-size:38px;
  margin:0 0 8px;
}
.lesson-panel h2{font-size:28px}
.lesson-panel p,.lesson-panel li{
  line-height:1.68;
  color:#3d4764;
}
.lesson-kicker{
  color:#8137f2;
  font-weight:800;
  letter-spacing:.06em;
  font-size:12px;
}
.lesson-card{
  background:#f8f9ff;
  border:1px solid #e8eaf4;
  border-radius:20px;
  padding:20px;
  margin:18px 0;
}
.lesson-card.tip{
  background:#fff8dc;
  border-color:#ffe693;
}
.lesson-card.challenge{
  background:#f3ecff;
  border-color:#dac7ff;
}
.lesson-card.success{
  background:#eafaf4;
  border-color:#c5efdf;
}
.code-block{
  background:#131a32;
  color:#f2f5ff;
  border-radius:18px;
  padding:18px 20px;
  font-family:Consolas,monospace;
  white-space:pre-wrap;
  overflow:auto;
  line-height:1.6;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.04);
}
.code-editor{
  width:100%;
  min-height:150px;
  border-radius:18px;
  border:1px solid #dce0ed;
  background:#10182c;
  color:#f6f8ff;
  padding:16px;
  font-family:Consolas,monospace;
  font-size:14px;
  resize:vertical;
}
.quiz-options{
  display:grid;
  gap:10px;
  margin:16px 0;
}
.quiz-option{
  padding:13px 15px;
  border:1px solid #dfe3ef;
  border-radius:14px;
  background:#fff;
  text-align:left;
  cursor:pointer;
  transition:.16s ease;
}
.quiz-option:hover{
  border-color:#a47af8;
  background:#faf8ff;
}
.quiz-option.correct{
  border-color:#27ad78;
  background:#e8faf3;
}
.quiz-option.wrong{
  border-color:#e25d6e;
  background:#fff0f2;
}
.feedback{
  margin-top:10px;
  font-weight:700;
}
.lesson-actions{
  display:flex;
  justify-content:space-between;
  gap:10px;
  margin-top:28px;
  padding-top:20px;
  border-top:1px solid var(--line);
}

/* MODALS */
.modal-backdrop{
  position:fixed;
  inset:0;
  background:rgba(9,14,34,.56);
  display:none;
  place-items:center;
  z-index:50;
  padding:20px;
}
.modal-backdrop.open{display:grid}
.modal{
  width:min(540px,100%);
  background:white;
  border-radius:26px;
  padding:30px;
  position:relative;
  box-shadow:0 26px 80px rgba(0,0,0,.26);
}
.modal-x{
  position:absolute;
  right:16px;
  top:12px;
  background:none;
  font-size:28px;
  cursor:pointer;
  color:#69708a;
}
.modal h2{
  font-size:32px;
  margin:0 0 4px;
}
.modal p{color:#697392}
.field{
  display:flex;
  flex-direction:column;
  gap:6px;
  margin:13px 0;
}
.field label{
  font-weight:700;
  font-size:13px;
}
.field input{
  border:1px solid #d9deea;
  border-radius:14px;
  padding:13px 14px;
  font-size:15px;
}
.field input:focus{
  outline:2px solid #d6c3ff;
  border-color:#8a51f7;
}
.toast{
  position:fixed;
  right:24px;
  bottom:92px;
  background:#111a37;
  color:#fff;
  border-radius:14px;
  padding:13px 16px;
  opacity:0;
  transform:translateY(12px);
  pointer-events:none;
  transition:.2s;
  z-index:80;
}
.toast.show{
  opacity:1;
  transform:translateY(0);
}
.celebration{
  position:fixed;
  inset:0;
  background:rgba(11,16,38,.72);
  display:none;
  place-items:center;
  z-index:90;
  padding:20px;
}
.celebration.open{display:grid}
.celebration-card{
  width:min(500px,100%);
  background:#fff;
  border-radius:28px;
  padding:34px;
  text-align:center;
  box-shadow:0 30px 80px rgba(0,0,0,.3);
}
.big-badge{font-size:84px}
.confetti{font-size:30px}
.celebration-card h2{
  font-size:40px;
  margin:6px 0;
}
.celebration-card h3{
  font-size:25px;
  color:#7e37f2;
  margin:0;
}
.celebration-card p{color:#697392}

/* PROFILE */
.profile-summary{
  display:grid;
  grid-template-columns:80px 1fr;
  gap:16px;
  align-items:center;
}
.profile-avatar{
  width:80px;
  height:80px;
  border-radius:22px;
  background:linear-gradient(135deg,#8d48f4,#2874e8);
  display:grid;
  place-items:center;
  color:#fff;
  font-size:35px;
  font-weight:800;
}
.profile-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:12px;
  margin-top:18px;
}
.profile-box{
  background:#f7f8fd;
  border:1px solid #e4e7f0;
  border-radius:14px;
  padding:15px;
}
.profile-box b{
  display:block;
  font-size:22px;
}
.certificate{
  border:6px double #b79230;
  background:#fffdf2;
  padding:30px;
  text-align:center;
  border-radius:10px;
}
.certificate h2{
  font-size:36px;
  margin:8px;
}
.certificate .name{
  font-family:"Baloo 2";
  font-size:34px;
  color:#6530c7;
  margin:12px 0;
}

/* RESPONSIVE */
@media (max-width:800px){
  .hero{min-height:480px}
  .hero h1{font-size:52px}
  .snake-logo{font-size:84px}
  .mission-grid{grid-template-columns:1fr 1fr}
  .game-types{grid-template-columns:repeat(2,1fr)}
  .dashboard-stats{grid-template-columns:1fr 1fr}
  .welcome-card{grid-template-columns:1fr}
  .welcome-graphic{display:none}
  .continue-card{grid-template-columns:auto 1fr}
  .continue-card .btn{grid-column:1/-1}
  .mission-main{grid-template-columns:1fr}
  .mission-sidebar{position:static}
  .lesson-steps{display:grid;grid-template-columns:repeat(3,1fr)}
}
@media (max-width:520px){
  .hero{
    min-height:450px;
    padding-top:54px;
  }
  .hero h1{font-size:42px}
  .hero p{font-size:15px}
  .stats-strip{
    grid-template-columns:repeat(3,1fr);
    gap:8px;
    padding:18px 10px;
  }
  .stat b{font-size:15px}
  .stat small{font-size:10px}
  .preview-section,.games-section,.dashboard-main,.mission-main{
    padding-left:14px;
    padding-right:14px;
  }
  .preview-section{
    padding-left:14px;
    padding-right:14px;
  }
  .mission-grid{grid-template-columns:1fr}
  .game-types{grid-template-columns:1fr 1fr}
  .topbar{padding:0 14px}
  .brand span{display:none}
  .dashboard-stats{grid-template-columns:1fr 1fr}
  .lesson-panel{padding:20px}
  .lesson-panel h1{font-size:30px}
  .lesson-steps{grid-template-columns:1fr 1fr}
  .modal{padding:24px 20px}
}
#syncStatus{position:fixed;bottom:0;right:0;z-index:80;padding:6px 12px;background:#172554;color:#fff;font:12px sans-serif;border-radius:8px 0 0 0;max-width:80vw}
.mission-card{font:inherit;text-align:left;border:0;cursor:pointer;width:100%}.mission-card:disabled{cursor:not-allowed}.mission-card p{font-size:13px}.lesson-step{display:block;border:0;text-align:left;cursor:pointer;width:100%;font:inherit;background:transparent}.lab{margin:24px 0;padding:20px;border:1px solid #dbeafe;border-radius:18px;background:#f8fafc}.lab-toolbar,.exercise-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}.lab-toolbar .btn{font-size:13px;padding:10px 12px}.lab label{display:block;font-weight:600;margin:14px 0 6px}.lab textarea,.lab select{width:100%;box-sizing:border-box;border:1px solid #94a3b8;border-radius:10px;padding:12px;font:15px monospace;background:#fff;color:#0f172a}.lab select{font:14px sans-serif}.lab #codeEditor{min-height:240px;resize:vertical;tab-size:4;line-height:1.6;white-space:pre;overflow:auto}.lab pre,.test-case pre{background:#0f172a;color:#e2e8f0;padding:16px;border-radius:12px;white-space:pre-wrap;overflow-wrap:anywhere;max-height:320px;overflow:auto}.line-guide{padding-left:32px}.line-guide li{padding:10px;border-bottom:1px solid #cbd5e1}.line-guide code{white-space:pre-wrap;overflow-wrap:anywhere}.line-guide p{font-size:14px;margin:6px 0}.highlight-error{background:#fee2e2}.error-text{color:#b91c1c}.test-case{border:1px solid #cbd5e1;padding:12px;border-radius:10px;margin:10px 0}.test-case summary,details summary{cursor:pointer;font-weight:600}a.btn{text-decoration:none;display:inline-block}button:focus-visible,a:focus-visible,textarea:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #2563eb;outline-offset:3px}.lesson-card p{line-height:1.75}button:disabled{opacity:.6}.lesson-actions{flex-wrap:wrap}.exercise-tabs .btn{font-size:13px}.lesson-panel{min-width:0}#lessonContent{overflow-wrap:anywhere}@media(max-width:600px){.lab{padding:12px}.lab-toolbar .btn{flex:1 1 40%}.mission-sidebar{max-height:240px;overflow:auto}.line-guide{padding-left:22px}#syncStatus{font-size:10px}}
@media(max-width:600px){.mission-sidebar{max-height:none;overflow:visible}.mission-side-icon{display:none}.mission-sidebar h3{margin:0 0 8px}.mission-sidebar .side-progress{margin:10px 0}.mission-sidebar .lesson-step{font-size:12px;padding:8px}}