/* ============ Madang Design Tokens ============ */
@font-face{font-family:'Pretendard Variable';src:url('https://cdn.jsdelivr.net/npm/pretendard@1.3.9/dist/web/variable/woff2/PretendardVariable.woff2') format('woff2-variations');font-weight:45 920;font-style:normal;font-display:swap}
@font-face{font-family:'JetBrains Mono';src:url('https://cdn.jsdelivr.net/fontsource/fonts/jetbrains-mono@latest/latin-500-normal.woff2') format('woff2');font-weight:500;font-style:normal;font-display:swap}

:root{
  /* palette */
  --madang-white:#FDFBF7; --paper:#FFFFFF;
  --ink-900:#1F1E1C; --ink-700:#4A4741; --ink-500:#736F67; --ink-400:#8F8A80; --ink-300:#B5B0A6;
  --line-200:#E8E4DA; --line-100:#F1EDE4; --fill-100:#F6F3EC;
  --coral-600:#E5551F; --coral-500:#FF6B3D; --coral-100:#FFE9E0; --coral-50:#FFF3EE;
  --blue-600:#2A53E0; --blue-500:#3D6BFF; --blue-100:#E3EAFF; --blue-50:#EFF3FF;
  --green-600:#189A6B; --green-500:#2BC48A; --green-100:#DCF5EA; --green-50:#ECFAF3;
  --amber-600:#B26E00; --amber-500:#F0A028; --amber-100:#FCEDD3; --amber-50:#FFF6E5;
  --red-600:#C93A36; --red-500:#E5484D; --red-100:#FBE2E2;
  /* semantic */
  --bg:var(--madang-white); --surface:var(--paper); --sunken:var(--fill-100);
  --text-strong:var(--ink-900); --text-body:var(--ink-700); --text-muted:var(--ink-500); --text-faint:var(--ink-400);
  --border:var(--line-200); --border-subtle:var(--line-100);
  --accent:var(--coral-500); --accent-hover:var(--coral-600); --accent-text:var(--coral-600);
  --interactive:var(--blue-500); --interactive-hover:var(--blue-600); --interactive-text:var(--blue-600);
  --focus-ring:0 0 0 3px rgba(61,107,255,.35);
  /* radius */
  --r-xs:6px; --r-sm:8px; --r-md:12px; --r-lg:16px; --r-xl:24px; --r-full:999px;
  /* shadows */
  --shadow-1:0 1px 2px rgba(31,30,28,.05);
  --shadow-2:0 2px 8px rgba(31,30,28,.07);
  --shadow-3:0 6px 20px rgba(31,30,28,.10);
  --shadow-4:0 16px 40px rgba(31,30,28,.14);
  /* fonts */
  --font-sans:'Pretendard Variable',Pretendard,-apple-system,'Apple SD Gothic Neo','Noto Sans KR',sans-serif;
  --font-mono:'JetBrains Mono','D2Coding',ui-monospace,monospace;
}

*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:var(--font-sans);
  font-size:16px; line-height:1.7;
  color:var(--text-body); background:var(--bg);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5{margin:0;color:var(--text-strong);font-weight:700;letter-spacing:-.015em;line-height:1.3}
h1{font-size:40px;font-weight:800;letter-spacing:-.02em;line-height:1.2}
h2{font-size:32px;font-weight:700;letter-spacing:-.02em}
h3{font-size:24px;font-weight:700;letter-spacing:-.01em;line-height:1.4}
h4{font-size:20px;font-weight:600;line-height:1.45}
p{margin:0 0 12px}
mark{background:var(--amber-100);color:inherit;padding:0 .12em;border-radius:3px}
a{color:var(--interactive-text);text-decoration:none}
a:hover{color:var(--interactive-hover);text-decoration:underline}
button{font-family:inherit;cursor:pointer}
code,kbd{font-family:var(--font-mono);font-size:.92em;background:var(--sunken);padding:2px 6px;border-radius:6px;color:var(--ink-900)}
::selection{background:var(--coral-100);color:var(--ink-900)}

/* ============ Dark mode ============ */
[data-theme="dark"]{
  --madang-white:#181713; --paper:#211F1B; --fill-100:#2A2823;
  --ink-900:#F5F2EA; --ink-700:#CFCAC0; --ink-500:#9B958A; --ink-400:#7B766C; --ink-300:#5A554D;
  --line-200:#38352E; --line-100:#2E2B25;
  --coral-500:#FF7B50; --coral-600:#FF8F6A; --coral-50:#33241D; --coral-100:#4A2E24;
  --blue-500:#6488FF; --blue-600:#84A0FF; --blue-50:#1F2536; --blue-100:#293150;
  --green-500:#3BD69B; --green-600:#5EDBAA; --green-50:#1B2E26; --green-100:#254A38;
  --amber-500:#F5B04C; --amber-600:#F8C77A; --amber-50:#332A19; --amber-100:#4A3B24;
  --red-500:#F26B6F; --red-600:#F58588; --red-100:#33201F;
  --bg:var(--madang-white); --surface:var(--paper); --sunken:var(--fill-100);
  --text-strong:var(--ink-900); --text-body:var(--ink-700); --text-muted:var(--ink-500); --text-faint:var(--ink-400);
  --border:var(--line-200); --border-subtle:var(--line-100);
  --accent:var(--coral-500); --accent-hover:var(--coral-600); --accent-text:var(--coral-600);
  --interactive:var(--blue-500); --interactive-hover:var(--blue-600); --interactive-text:var(--blue-600);
}
[data-theme="dark"] .btn.ink{background:#F5F2EA;color:var(--ink-900)}
[data-theme="dark"] .btn.ink:hover{background:#fff}
[data-theme="dark"] .filter-chip.active{background:#F5F2EA;color:#1F1E1C;border-color:#F5F2EA}
[data-theme="dark"] .hero-art .stat{background:var(--surface)}

/* ============ Layout ============ */
.app{display:grid;grid-template-columns:var(--sidebar-w,280px) 1fr;min-height:100vh}
.sidebar{
  position:sticky; top:0; height:100vh;
  background:var(--surface); border-right:1px solid var(--border);
  padding:20px 14px; overflow-y:auto; z-index:30;
  display:flex; flex-direction:column; gap:18px;
}

/* Sidebar resizer handle */
.sidebar-resizer{
  position:fixed;top:0;left:calc(var(--sidebar-w,280px) - 4px);
  width:8px;height:100vh;z-index:35;
  cursor:col-resize; user-select:none;
  display:flex;align-items:center;justify-content:center;
  transition:left .05s linear;
}
.sidebar-resizer::before{
  content:'';position:absolute;top:0;bottom:0;left:3px;width:2px;
  background:transparent;transition:background .15s;border-radius:2px;
}
.sidebar-resizer:hover::before,.sidebar-resizer.dragging::before{background:var(--coral-500)}
.sidebar-resizer .grip{
  width:4px;height:32px;background:var(--border);border-radius:99px;
  opacity:0;transition:opacity .15s;
}
.sidebar-resizer:hover .grip,.sidebar-resizer.dragging .grip{opacity:1;background:var(--coral-500)}
body.sidebar-resizing{cursor:col-resize !important;user-select:none}
body.sidebar-resizing *{cursor:col-resize !important;pointer-events:none}
body.sidebar-resizing .sidebar-resizer{pointer-events:auto;transition:none}
body.sidebar-resizing .sidebar{transition:none}
.sidebar-brand{display:flex;align-items:center;gap:10px;padding:2px 8px 8px}
.sidebar-brand .wordmark{display:inline-flex;align-items:baseline;gap:5px}
.sidebar-brand .wm-main{font:800 15px/1 var(--font-sans);letter-spacing:.04em;color:var(--ink-900)}
.sidebar-brand .wm-tld{font:600 9px/1 var(--font-sans);letter-spacing:.1em;color:var(--ink-900);opacity:.55}
.sidebar-brand .tag{
  display:inline-block;margin-left:4px;font:600 10px/1 var(--font-mono);
  padding:3px 7px;border-radius:var(--r-full);
  background:var(--coral-50);color:var(--coral-600);letter-spacing:.02em;
}

.progress-wrap{padding:10px 8px 4px}
.progress-label{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:8px}
.progress-label .lbl{font:600 12px/1 var(--font-sans);color:var(--text-muted);letter-spacing:.02em}
.progress-label .val{font:700 13px/1 var(--font-mono);color:var(--ink-900)}
.progress-bar{height:6px;background:var(--sunken);border-radius:99px;overflow:hidden}
.progress-fill{height:100%;background:var(--coral-500);border-radius:99px;transition:width .3s ease-out}

/* Sidebar search */
.sidebar-search{
  position:relative;margin:0 4px;
}
.sidebar-search input{
  width:100%;height:36px;padding:0 12px 0 34px;
  border:1px solid var(--border);border-radius:var(--r-md);
  background:var(--sunken);color:var(--ink-900);
  font:400 13px/1 var(--font-sans);
  transition:background .12s,border-color .12s,box-shadow .12s;
}
.sidebar-search input:focus{outline:none;background:var(--surface);border-color:var(--blue-500);box-shadow:var(--focus-ring)}
.sidebar-search .ico{
  position:absolute;left:11px;top:50%;transform:translateY(-50%);
  width:14px;height:14px;color:var(--text-muted);pointer-events:none;
}
.sidebar-search .clear{
  position:absolute;right:6px;top:50%;transform:translateY(-50%);
  width:22px;height:22px;border:none;border-radius:99px;background:transparent;
  color:var(--text-muted);cursor:pointer;display:none;align-items:center;justify-content:center;
}
.sidebar-search .clear.show{display:flex}
.sidebar-search .clear:hover{background:var(--line-100);color:var(--ink-900)}

.sidebar-nav-bar{
  display:flex;align-items:center;justify-content:space-between;gap:8px;
  padding:10px 8px 4px;
}
.nav-group-label{
  font:700 11px/1 var(--font-sans);letter-spacing:.08em;
  color:var(--text-faint);text-transform:uppercase;
}
.nav-group-label.nav-group-tools,
.nav-group-label.nav-group-split{margin:14px 8px 4px}
.nav-collapse-all{
  border:none;background:transparent;padding:2px 4px;
  font:600 12px/1 var(--font-sans);color:var(--text-muted);cursor:pointer;
}
.nav-collapse-all:hover{color:var(--coral-600)}

.sidebar-nav{flex:1;display:flex;flex-direction:column;gap:2px;overflow-y:auto;padding-right:2px}
.sidebar-nav::-webkit-scrollbar{width:6px}
.sidebar-nav::-webkit-scrollbar-thumb{background:var(--line-100);border-radius:99px}

.nav-section{display:flex;flex-direction:column;gap:0}
.nav-section-head{
  display:flex;align-items:center;gap:6px;width:100%;
  padding:7px 8px;border:none;background:transparent;text-align:left;
  border-radius:var(--r-sm);cursor:pointer;
  font:650 13px/1.35 var(--font-sans);
  color:var(--ink-900);
  transition:background .12s;
}
.nav-section-head:hover{background:var(--sunken)}
.nav-section-head.active-sec{color:var(--coral-600)}
.nav-section-head .chev{
  flex-shrink:0;width:14px;text-align:center;
  transition:transform .18s;opacity:.45;font-size:10px;color:var(--ink-500);
}
.nav-section-head.collapsed .chev{transform:rotate(-90deg)}
.nav-section-head .emo{font-size:14px;opacity:.9}
.nav-section-head .sec-label{flex:1;min-width:0}
.nav-topics{
  display:flex;flex-direction:column;gap:1px;
  margin-left:10px;padding-left:8px;
  border-left:1px solid var(--border-subtle);
  overflow:hidden;transition:max-height .25s ease-out;
}
.nav-topic{display:flex;flex-direction:column}
.nav-topic-head{
  display:flex;align-items:center;gap:6px;width:100%;
  padding:6px 8px;border:none;background:transparent;text-align:left;
  border-radius:var(--r-sm);cursor:pointer;
  font:600 12.5px/1.35 var(--font-sans);
  color:var(--ink-700);
  transition:background .12s;
}
.nav-topic-head:hover{background:var(--sunken)}
.nav-topic-head.active-sec{color:var(--coral-600)}
.nav-topic-head .chev{
  flex-shrink:0;width:14px;text-align:center;
  transition:transform .18s;opacity:.45;font-size:10px;color:var(--ink-500);
}
.nav-topic-head.collapsed .chev{transform:rotate(-90deg)}
.nav-topic-head .sec-label{flex:1;min-width:0}
.nav-topic .nav-items{margin-left:10px;padding-left:8px}
.nav-items-loose{margin-left:0;padding-left:2px}
/* Section progress ring */
.sec-progress{
  width:22px;height:22px;position:relative;flex-shrink:0;
}
.sec-progress svg{width:100%;height:100%;transform:rotate(-90deg)}
.sec-progress circle{fill:none;stroke-width:3}
.sec-progress .track{stroke:var(--line-100)}
.sec-progress .fill{stroke:var(--coral-500);stroke-linecap:round;transition:stroke-dashoffset .3s}
.sec-progress .txt{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  font:700 8.5px/1 var(--font-mono);color:var(--ink-900);letter-spacing:-.02em;
}
.sec-progress.complete .fill{stroke:var(--green-500)}
.sec-progress.complete .txt{color:var(--green-600)}
.nav-items{
  display:flex;flex-direction:column;gap:1px;
  margin-left:14px;padding-left:10px;
  border-left:1px solid var(--border-subtle);
  overflow:hidden;transition:max-height .25s ease-out;
}
.nav-section-flat .nav-items{margin-left:0;padding-left:0;border-left:none}
.nav-item{
  display:flex;align-items:center;gap:8px;
  padding:6px 8px;border-radius:var(--r-sm);
  border:none;background:transparent;text-align:left;cursor:pointer;
  font:500 13px/1.4 var(--font-sans);color:var(--text-body);
  position:relative; transition:background .12s,color .12s;
  text-decoration:none;color:var(--text-body);
}
.nav-item .nav-star{color:var(--amber-500);font-size:11px;margin-left:auto}
.nav-item.hidden{display:none}
.nav-item .match{background:var(--amber-100);color:var(--ink-900);border-radius:3px;padding:0 2px}
.nav-item:hover{background:var(--sunken)}
.nav-item.active{background:var(--coral-50);color:var(--coral-600);font-weight:600}
.nav-item.active::before{
  content:''; position:absolute; left:-11px; top:50%; transform:translateY(-50%);
  width:2px; height:14px; border-radius:2px; background:var(--coral-500);
}
.nav-section-flat .nav-item.active::before{left:0}
.nav-item .check{
  margin-left:auto; width:16px; height:16px; border-radius:var(--r-full);
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--green-500);color:#fff;font-size:10px;font-weight:800;
  opacity:0; transition:opacity .15s;
}
.nav-item.done .check{opacity:1}

/* Bookmark star button */
.star-btn{
  width:32px;height:32px;border-radius:99px;border:none;background:transparent;
  color:var(--ink-300);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;
  transition:all .15s;
}
.star-btn:hover{background:var(--sunken);color:var(--amber-500);transform:scale(1.08)}
.star-btn.on{color:var(--amber-500)}
.star-btn.on:hover{color:var(--amber-600)}
.star-btn svg{width:18px;height:18px}
.star-btn.on svg{fill:currentColor}
.star-btn.sm{width:26px;height:26px}
.star-btn.sm svg{width:15px;height:15px}
.star-btn.lg{width:40px;height:40px}
.star-btn.lg svg{width:22px;height:22px}

/* Curated sections in sidebar (bookmark / recent) */
.curated-section{
  margin:8px 4px 12px;padding:12px 12px 10px;
  background:var(--sunken);border-radius:var(--r-md);
  border:1px solid var(--border-subtle);
}
.curated-section.empty{background:transparent;border-style:dashed;border-color:var(--border);text-align:center}
.curated-section-head{
  display:flex;align-items:center;justify-content:space-between;gap:8px;
  font:700 11px/1 var(--font-sans);letter-spacing:.06em;color:var(--text-muted);
  text-transform:uppercase;margin-bottom:8px;
}
.curated-section-head .clear-all{
  border:none;background:transparent;color:var(--text-faint);cursor:pointer;
  font:500 10px/1 var(--font-sans);text-transform:none;letter-spacing:0;
  padding:2px 6px;border-radius:6px;
}
.curated-section-head .clear-all:hover{background:var(--line-100);color:var(--red-500)}
.curated-list{display:flex;flex-direction:column;gap:1px}
.curated-item{
  display:flex;align-items:center;gap:8px;
  padding:6px 8px;border-radius:var(--r-sm);
  border:none;background:transparent;text-align:left;cursor:pointer;width:100%;
  font:500 13px/1.35 var(--font-sans);color:var(--text-body);
  transition:background .12s;
}
.curated-item:hover{background:var(--surface);color:var(--ink-900)}
.curated-item .sec-emo{font-size:12px;opacity:.75;flex-shrink:0}
.curated-item .txt{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.curated-empty-text{
  font:400 12px/1.5 var(--font-sans);color:var(--text-faint);
  padding:4px 0;
}

/* Sidebar footer */
.sidebar-footer{
  display:flex;align-items:center;gap:8px;
  padding:12px 10px 4px;border-top:1px solid var(--border-subtle);
  margin-top:4px;
}
.sidebar-footer .saved{
  display:inline-flex;align-items:center;gap:6px;font:500 11px/1 var(--font-sans);color:var(--text-muted);
}
.sidebar-footer .saved .pulse{
  width:6px;height:6px;border-radius:99px;background:var(--green-500);
  box-shadow:0 0 0 0 rgba(43,196,138,.6);animation:pulse 2s infinite;
}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(43,196,138,.6)}70%{box-shadow:0 0 0 6px rgba(43,196,138,0)}100%{box-shadow:0 0 0 0 rgba(43,196,138,0)}}
.sidebar-footer .theme-btn{
  margin-left:auto;width:30px;height:30px;border-radius:var(--r-md);
  border:1px solid var(--border);background:var(--surface);cursor:pointer;
  display:inline-flex;align-items:center;justify-content:center;color:var(--text-body);
  transition:background .12s,color .12s;
}
.sidebar-footer .theme-btn:hover{background:var(--sunken);color:var(--ink-900)}

/* Empty search state */
.nav-empty{
  padding:20px 12px;text-align:center;color:var(--text-muted);
  font:500 12.5px/1.5 var(--font-sans);display:none;
}
.nav-empty.show{display:block}

/* Completed champion badge in sidebar */
.champion-badge{
  margin:8px 4px;padding:12px 14px;border-radius:var(--r-md);
  background:linear-gradient(135deg,var(--green-50),var(--coral-50));
  border:1px solid var(--green-100);
  display:flex;align-items:center;gap:10px;
}
.champion-badge .emo{font-size:22px;flex-shrink:0}
.champion-badge .txt{font:600 12px/1.4 var(--font-sans);color:var(--ink-900);letter-spacing:-.005em}
.champion-badge .sub{font:500 10.5px/1 var(--font-sans);color:var(--text-muted);margin-top:2px}

/* ============ Main ============ */
.main{min-width:0}
.topbar{
  position:sticky;top:0;z-index:20;
  height:60px;padding:0 32px;
  display:flex;align-items:center;gap:16px;
  background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:blur(10px);
  border-bottom:1px solid transparent;
  transition:border-color .2s;
}
.topbar.scrolled{border-bottom-color:var(--line-200)}
.topbar .crumb{display:flex;align-items:center;gap:8px;font:500 13px/1 var(--font-sans);color:var(--text-muted)}
.topbar .crumb .sep{opacity:.5}
.topbar .crumb .cur{color:var(--ink-900);font-weight:600}
.topbar .grow{flex:1}
.topbar-sep{color:var(--border);font-weight:300;user-select:none}
.home-btn{gap:6px}
.home-btn.active{background:var(--coral-50);border-color:var(--coral-100);color:var(--coral-600)}
.back-btn{gap:4px;padding:0 10px}
.back-btn:disabled{opacity:.38;cursor:default}
.back-btn:disabled:hover{background:var(--surface);border-color:var(--border)}
@media (max-width:640px){
  .home-btn-label{display:none}
  .home-btn{padding:0;width:36px;justify-content:center}
}
.topbar-btn{
  display:inline-flex;align-items:center;gap:6px;
  height:36px;padding:0 12px;border:1px solid var(--border);border-radius:var(--r-md);
  background:var(--surface);color:var(--text-body);
  font:500 13px/1 var(--font-sans);cursor:pointer;transition:background .12s,border-color .12s;
}
.topbar-btn:hover{background:var(--sunken);border-color:var(--ink-300)}
.topbar-icon-btn{
  width:36px;height:36px;border-radius:var(--r-md);border:1px solid transparent;
  background:transparent;color:var(--text-muted);
  display:inline-flex;align-items:center;justify-content:center;cursor:pointer;
  transition:all .12s;
}
.topbar-icon-btn:hover{background:var(--sunken);color:var(--ink-900);border-color:var(--border)}
.topbar-icon-btn.danger:hover{color:var(--red-500);background:#FDECEC}
.hamburger{display:none;width:36px;height:36px;border-radius:var(--r-md);border:1px solid var(--border);background:var(--surface);align-items:center;justify-content:center;cursor:pointer}

.page{max-width:820px;margin:0 auto;padding:40px 32px 120px}
.page.wide{max-width:1080px}

/* ============ Chips / badges ============ */
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border-radius:var(--r-full);
  font:600 12px/1 var(--font-sans);
  background:var(--sunken);color:var(--text-body);
}
.chip.coral{background:var(--coral-50);color:var(--coral-600)}
.chip.blue{background:var(--blue-50);color:var(--blue-600)}
.chip.green{background:var(--green-50);color:var(--green-600)}
.chip.amber{background:var(--amber-50);color:var(--amber-600)}
.chip.gray{background:var(--sunken);color:var(--text-muted)}
.chip .dot{width:6px;height:6px;border-radius:99px;background:currentColor}

.badge-diff{
  display:inline-flex;align-items:center;gap:5px;
  padding:3px 9px;border-radius:var(--r-full);
  font:700 11px/1 var(--font-sans);letter-spacing:.02em;
}
.badge-easy{background:var(--green-50);color:var(--green-600)}
.badge-mid{background:var(--amber-50);color:var(--amber-600)}
.badge-skip{background:var(--sunken);color:var(--text-muted)}

/* ============ Buttons ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:7px;
  height:44px;padding:0 20px;border:1px solid transparent;
  border-radius:var(--r-md); font:600 14px/1 var(--font-sans);
  cursor:pointer; transition:background .12s,transform .1s,border-color .12s;
  white-space:nowrap;
}
.btn:active{transform:scale(.98)}
.btn.primary{background:var(--coral-500);color:#fff}
.btn.primary:hover{background:var(--coral-600)}
.btn.secondary{background:var(--sunken);color:var(--ink-900)}
.btn.secondary:hover{background:var(--line-100)}
.btn.outline{background:var(--surface);color:var(--ink-900);border-color:var(--border)}
.btn.outline:hover{background:var(--sunken);border-color:var(--ink-300)}
.btn.ghost{background:transparent;color:var(--text-body)}
.btn.ghost:hover{background:var(--sunken)}
.btn.ink{background:var(--ink-900);color:#F5F2EA}
.btn.ink:hover{background:#000}
.btn.sm{height:36px;padding:0 14px;font-size:13px}
.btn.lg{height:52px;padding:0 26px;font-size:16px}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn.done-toggle.checked{background:var(--green-500);color:#fff;border-color:transparent}
.btn.done-toggle.checked:hover{background:var(--green-600)}

/* ============ Hero ============ */
.hero{
  padding:64px 32px 40px;
  display:grid;grid-template-columns:1.2fr 1fr;gap:56px;align-items:center;
  max-width:1080px;margin:0 auto;
}
.hero .eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 12px;border-radius:var(--r-full);
  background:var(--coral-50);color:var(--coral-600);
  font:600 12px/1 var(--font-sans);letter-spacing:.02em;
  margin-bottom:20px;
}
.hero h1{font-size:52px;line-height:1.15;letter-spacing:-.025em;font-weight:800;margin-bottom:16px}
.hero h1 .accent{color:var(--coral-500)}
.hero .sub{font-size:18px;line-height:1.65;color:var(--text-body);margin-bottom:28px;max-width:520px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.hero-art{
  aspect-ratio:1/1; max-width:380px; justify-self:end;
  border-radius:var(--r-xl); background:var(--paper);
  border:1px solid var(--border); box-shadow:var(--shadow-3);
  position:relative; overflow:hidden;
  display:flex;align-items:center;justify-content:center;
}
.hero-art .frame-lg{width:70%;height:70%;position:relative}
.hero-art .frame-lg svg{width:100%;height:100%}
.hero-art .stat{
  position:absolute;background:#fff;border:1px solid var(--border);
  border-radius:var(--r-md);padding:10px 14px;box-shadow:var(--shadow-2);
  font:600 12px/1.3 var(--font-sans);color:var(--ink-900);
  display:flex;align-items:center;gap:8px;
}
.hero-art .stat .k{color:var(--text-muted);font-size:11px}
.hero-art .stat .v{font-size:18px;font-weight:800;font-family:var(--font-mono)}
.hero-art .stat.s1{top:12%;left:6%}
.hero-art .stat.s2{bottom:14%;right:6%}
.hero-art .stat.s3{top:56%;left:2%}
.hero-art .stat .dot{width:8px;height:8px;border-radius:99px}
.hero-art .stat.s1 .dot{background:var(--coral-500)}
.hero-art .stat.s2 .dot{background:var(--blue-500)}
.hero-art .stat.s3 .dot{background:var(--green-500)}

/* ============ Cards ============ */
.card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--r-lg);padding:24px;
  box-shadow:var(--shadow-1); transition:box-shadow .18s,transform .18s;
}
.card.hover:hover{box-shadow:var(--shadow-2);transform:translateY(-2px)}
.card-title{font-size:18px;font-weight:700;color:var(--ink-900);margin-bottom:8px;letter-spacing:-.01em}
.card-sub{font-size:14px;color:var(--text-muted)}

.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}

/* ============ Roadmap ============ */
.roadmap{position:relative;margin-top:24px}
.roadmap-track{
  display:grid;grid-template-columns:repeat(4,1fr);gap:16px;position:relative;
}
.roadmap-track::before{
  content:''; position:absolute; top:38px; left:8%; right:8%; height:2px;
  background:repeating-linear-gradient(90deg,var(--ink-300) 0,var(--ink-300) 4px,transparent 4px,transparent 10px);
  z-index:0;
}
.rm-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);
  padding:20px;text-align:left;box-shadow:var(--shadow-1);position:relative;z-index:1;
  transition:transform .18s,box-shadow .18s,border-color .18s;
  cursor:pointer;display:flex;flex-direction:column;gap:12px;
}
.rm-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-3);border-color:var(--ink-300)}
.rm-card .step-badge{
  width:36px;height:36px;border-radius:var(--r-full);
  background:var(--paper);border:2px solid var(--ink-900);
  display:flex;align-items:center;justify-content:center;
  font:800 14px/1 var(--font-sans);color:var(--ink-900);
}
.rm-card .step-emo{font-size:26px;line-height:1}
.rm-card .rm-title{font:700 17px/1.3 var(--font-sans);color:var(--ink-900);letter-spacing:-.01em}
.rm-card .rm-meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:auto}
.rm-card .rm-topics{
  font:600 12px/1.4 var(--font-sans); color:var(--coral-600); margin:6px 0 8px;
}
.rm-card .rm-desc{font-size:13.5px;line-height:1.55;color:var(--text-muted);margin:0}
.home-ref{display:flex;flex-direction:column;gap:14px;margin-bottom:8px}
.home-ref-sec{padding:14px 16px;border:1px solid var(--border-subtle);border-radius:var(--r-md);background:var(--sunken)}
.home-ref-head{font:700 14px/1.3 var(--font-sans);color:var(--ink-900);margin-bottom:10px;display:flex;align-items:center;gap:6px}
.home-ref-topics{display:flex;flex-wrap:wrap;gap:8px}
.home-ref-chip{
  border:1px solid var(--border);background:var(--surface);border-radius:var(--r-sm);
  padding:6px 10px;font:600 12.5px/1 var(--font-sans);color:var(--text-body);cursor:pointer;
}
.home-ref-chip:hover{border-color:var(--coral-400);color:var(--coral-600)}
.rm-card .rm-progress{
  display:flex;align-items:center;gap:8px;padding-top:8px;margin-top:auto;border-top:1px dashed var(--border-subtle);
}
.rm-card .rm-progress .bar{flex:1;height:5px;background:var(--sunken);border-radius:99px;overflow:hidden}
.rm-card .rm-progress .fill{height:100%;background:var(--coral-500);border-radius:99px;transition:width .3s}
.rm-card .rm-progress .pct{font:700 11px/1 var(--font-mono);color:var(--ink-900)}
.rm-card.done .rm-progress .fill{background:var(--green-500)}
.rm-card.done .step-badge{background:var(--green-500);color:#fff;border-color:var(--green-500)}
.rm-card.in-progress .step-badge{background:var(--coral-500);color:#fff;border-color:var(--coral-500)}

/* Scenario cards (뭘 하고 싶으세요?) */
.scenarios{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;
  margin:16px 0 8px;
}
.scenario{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);
  padding:18px 20px;text-align:left;cursor:pointer;
  transition:all .18s;position:relative;overflow:hidden;
  display:flex;flex-direction:column;gap:10px;
}
.scenario:hover{transform:translateY(-3px);box-shadow:var(--shadow-3);border-color:var(--coral-500)}
.scenario .sc-emo{font-size:26px;line-height:1}
.scenario .sc-question{font:700 15px/1.4 var(--font-sans);color:var(--ink-900);letter-spacing:-.01em}
.scenario .sc-arrow{
  display:inline-flex;align-items:center;gap:6px;
  font:600 12.5px/1 var(--font-sans);color:var(--coral-600);
  padding-top:6px;border-top:1px dashed var(--border-subtle);
}
.scenario:hover .sc-arrow{color:var(--coral-600)}

/* Home recent list */
.recent-strip{
  max-width:1080px;margin:20px auto 0;padding:20px 24px;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);
  box-shadow:var(--shadow-1);
}
.recent-strip-head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px;
}
.recent-strip-head .title{
  display:flex;align-items:center;gap:8px;
  font:700 13px/1 var(--font-sans);color:var(--ink-900);letter-spacing:.02em;
}
.recent-strip-head .clear{
  border:none;background:transparent;color:var(--text-muted);cursor:pointer;
  font:500 12px/1 var(--font-sans);padding:4px 8px;border-radius:6px;
}
.recent-strip-head .clear:hover{background:var(--sunken);color:var(--red-500)}
.recent-list{
  display:flex;gap:10px;flex-wrap:wrap;
}
.recent-item{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;border-radius:var(--r-full);
  border:1px solid var(--border);background:var(--surface);
  font:500 13px/1 var(--font-sans);color:var(--text-body);cursor:pointer;
  transition:all .12s;text-decoration:none;
}
.recent-item:hover{background:var(--coral-50);border-color:var(--coral-500);color:var(--coral-600);text-decoration:none;transform:translateY(-1px)}
.recent-item .sec-emo{font-size:14px;opacity:.85}

/* Continue-learning hero card */
.continue-card{
  max-width:1080px;margin:32px auto 0;padding:24px 28px;
  background:var(--surface);border:1px solid var(--coral-100);border-radius:var(--r-lg);
  box-shadow:var(--shadow-2);
  display:flex;align-items:center;gap:20px;flex-wrap:wrap;
}
.continue-card .info{flex:1;min-width:240px}
.continue-card .eyebrow-sm{
  display:inline-flex;align-items:center;gap:6px;
  font:700 11px/1 var(--font-sans);color:var(--coral-600);letter-spacing:.08em;text-transform:uppercase;margin-bottom:6px;
}
.continue-card .eyebrow-sm .dot{width:6px;height:6px;background:var(--coral-500);border-radius:99px;animation:pulse 2s infinite}
.continue-card .ct-title{font:700 18px/1.3 var(--font-sans);color:var(--ink-900);margin-bottom:2px;letter-spacing:-.01em}
.continue-card .ct-sub{font:400 14px/1.5 var(--font-sans);color:var(--text-muted)}

/* Champion badge on home */
.home-champion{
  max-width:1080px;margin:20px auto 0;padding:20px 24px;
  background:linear-gradient(135deg,var(--amber-50) 0%,var(--coral-50) 100%);
  border:1px solid var(--amber-100);border-radius:var(--r-lg);
  display:flex;align-items:center;gap:16px;
}
.home-champion .medal{font-size:36px;line-height:1}
.home-champion .txt{flex:1}
.home-champion .t1{font:700 16px/1.3 var(--font-sans);color:var(--ink-900);letter-spacing:-.005em}
.home-champion .t2{font:400 13px/1.5 var(--font-sans);color:var(--text-body);margin-top:2px}

/* Mission step list — cleaner than table */
.recipe{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);
  padding:20px 24px;margin:16px 0 24px;box-shadow:var(--shadow-1);
}
.recipe-title{
  font:700 13px/1 var(--font-sans);color:var(--coral-600);letter-spacing:.1em;text-transform:uppercase;
  display:flex;align-items:center;gap:8px;margin-bottom:14px;
}
.recipe-row{
  display:grid;grid-template-columns:120px 1fr;gap:16px;padding:10px 0;
  border-bottom:1px dashed var(--border-subtle);
}
.recipe-row:last-child{border-bottom:none;padding-bottom:0}
.recipe-row .k{font:600 13px/1.4 var(--font-sans);color:var(--text-muted);display:flex;align-items:center;gap:6px}
.recipe-row .v{font:500 14.5px/1.55 var(--font-sans);color:var(--ink-900)}
.recipe-row .v strong{color:var(--coral-600);font-weight:600}
.recipe-row .v code{font-family:var(--font-mono);font-size:.9em}
@media (max-width:640px){.recipe-row{grid-template-columns:1fr;gap:2px}.recipe-row .k{font-size:12px}}

/* Verify-it box */
.verify{
  margin:20px 0;padding:16px 20px;background:var(--green-50);
  border-left:3px solid var(--green-500);border-radius:var(--r-md);
}
.verify .vt{font:700 13px/1 var(--font-sans);color:var(--green-600);letter-spacing:.02em;margin-bottom:10px;display:flex;align-items:center;gap:6px}
.verify ul{margin:0;padding-left:20px;color:var(--text-body)}
.verify li{margin:4px 0;font-size:14.5px;line-height:1.6}

/* ============ Callouts ============ */
.callout{
  display:flex;gap:14px;padding:16px 18px;border-radius:var(--r-md);
  margin:20px 0; border:1px solid transparent; align-items:flex-start;
}
.callout .ico{font-size:22px;line-height:1.3;flex-shrink:0}
.callout .body{flex:1;font-size:15px;line-height:1.65;color:var(--text-body)}
.callout .body strong{color:var(--ink-900)}
.callout.tip{background:var(--blue-50);border-color:var(--blue-100)}
.callout.tip .body strong{color:var(--blue-600)}
.callout.warn{background:var(--amber-50);border-color:var(--amber-100)}
.callout.warn .body strong{color:var(--amber-600)}
.callout.skip{background:var(--sunken);border-color:var(--border-subtle)}
.callout.skip .body{color:var(--text-muted)}
.callout.skip .body strong{color:var(--ink-700)}

/* ============ Screenshot placeholder ============ */
.screenshot{
  background:repeating-linear-gradient(45deg,var(--fill-100) 0,var(--fill-100) 12px,var(--line-100) 12px,var(--line-100) 24px);
  border:1px dashed var(--ink-300);
  border-radius:var(--r-md);
  padding:36px 24px; margin:20px 0;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;
  text-align:center;
}
.screenshot .cam{font-size:32px;line-height:1;filter:grayscale(.4)}
.screenshot .l1{font:600 14px/1.4 var(--font-sans);color:var(--ink-700)}
.screenshot .l2{font:400 13px/1.5 var(--font-sans);color:var(--text-muted);max-width:520px}

/* ============ Step blocks ============ */
.step{
  display:flex;gap:16px;padding:20px;
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--r-lg);margin-bottom:16px;
}
.step .num{
  flex-shrink:0;width:36px;height:36px;border-radius:var(--r-full);
  background:var(--coral-500);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font:800 15px/1 var(--font-mono);
}
.step .content{flex:1;min-width:0}
.step .content h4{margin-bottom:6px;font-size:17px}
.step .content p{margin:0 0 8px;font-size:15px;color:var(--text-body)}

/* ============ Quiz ============ */
.quiz{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);
  padding:24px;margin:28px 0;
}
.quiz-head{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.quiz-head .q-emo{font-size:22px}
.quiz-head .q-title{font:700 17px/1.3 var(--font-sans);color:var(--ink-900);letter-spacing:-.01em}
.quiz .q-question{font:500 16px/1.55 var(--font-sans);color:var(--ink-900);margin-bottom:14px}
.quiz-options{display:flex;flex-direction:column;gap:10px}
.q-opt{
  display:flex;align-items:center;gap:12px;
  padding:14px 16px; background:var(--surface);
  border:1.5px solid var(--border); border-radius:var(--r-md);
  cursor:pointer; transition:all .12s;
  font:500 15px/1.4 var(--font-sans);color:var(--text-body);text-align:left;
}
.q-opt:hover{border-color:var(--ink-400);background:var(--sunken)}
.q-opt .letter{
  width:26px;height:26px;border-radius:var(--r-full);
  background:var(--sunken);color:var(--text-muted);
  display:flex;align-items:center;justify-content:center;
  font:700 12px/1 var(--font-mono);flex-shrink:0;
}
.q-opt.correct{border-color:var(--green-500);background:var(--green-50);color:var(--green-600)}
.q-opt.correct .letter{background:var(--green-500);color:#fff}
.q-opt.wrong{border-color:var(--red-500);background:#FEECEC;color:var(--red-600)}
.q-opt.wrong .letter{background:var(--red-500);color:#fff}
.q-opt.disabled{cursor:default;opacity:.7}
.q-opt.disabled:hover{border-color:var(--border);background:var(--surface)}
.q-opt.correct.disabled,.q-opt.wrong.disabled{opacity:1}
.q-feedback{
  margin-top:14px;padding:12px 16px;border-radius:var(--r-md);
  font:500 14.5px/1.6 var(--font-sans);display:none;
}
.q-feedback.show{display:block}
.q-feedback.correct{background:var(--green-50);color:var(--green-600);border:1px solid var(--green-100)}
.q-feedback.wrong{background:var(--amber-50);color:var(--amber-600);border:1px solid var(--amber-100)}

/* ============ Analogy card ============ */
.analogy{
  background:linear-gradient(135deg,var(--coral-50),var(--paper));
  border:1px solid var(--coral-100);
  border-radius:var(--r-lg); padding:22px 24px; margin:24px 0;
  display:flex; gap:16px; align-items:flex-start;
}
.analogy .a-ico{font-size:32px;line-height:1;flex-shrink:0}
.analogy .a-body{flex:1}
.analogy .a-label{font:700 11px/1 var(--font-sans);letter-spacing:.12em;color:var(--coral-600);margin-bottom:6px;text-transform:uppercase}
.analogy .a-text{font:500 16px/1.6 var(--font-sans);color:var(--ink-900);margin:0}

/* ============ Toggle term cards (grid) ============ */
.term-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px;margin:16px 0}
.term{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--r-md);padding:12px 14px;cursor:pointer;
  transition:border-color .12s,box-shadow .12s;
  display:flex;flex-direction:column;gap:6px;
}
.term:hover{border-color:var(--ink-300);box-shadow:var(--shadow-1)}
.term .t-head{display:flex;justify-content:space-between;align-items:center;gap:8px}
.term .t-name{font:700 14px/1.3 var(--font-sans);color:var(--ink-900)}
.term .t-en{font:500 11px/1 var(--font-mono);color:var(--text-muted)}
.term .t-def{
  font:400 13px/1.55 var(--font-sans);color:var(--text-body);
  max-height:0;overflow:hidden;transition:max-height .25s ease-out;
}
.term.open .t-def{max-height:200px;padding-top:4px;border-top:1px dashed var(--border-subtle);margin-top:2px;padding-top:8px}
.term .chev{font-size:12px;color:var(--text-muted);transition:transform .18s}
.term.open .chev{transform:rotate(180deg)}

/* ============ Concept link (점선 밑줄 · 클릭해서 부록으로) ============ */
.concept-link{
  display:inline;color:var(--ink-900);text-decoration:none;
  border-bottom:1.5px dashed var(--coral-500);
  font-weight:500;cursor:pointer;transition:color .12s,border-color .12s;
}
.concept-link:hover{color:var(--coral-600);border-bottom-color:var(--coral-600);text-decoration:none}

/* ============ Tooltip ============ */
.term-tip{
  display:inline;position:relative;
  border-bottom:1.5px dashed var(--coral-500);color:var(--ink-900);cursor:help;font-weight:500;
}
.term-tip:hover{color:var(--coral-600)}
.term-tip .bubble{
  position:absolute;bottom:calc(100% + 8px);left:50%;transform:translateX(-50%);
  min-width:220px;max-width:300px;
  background:var(--ink-900);color:#F5F2EA;
  padding:10px 12px;border-radius:var(--r-sm);
  font:400 12.5px/1.55 var(--font-sans);
  box-shadow:var(--shadow-3);
  opacity:0;pointer-events:none;transition:opacity .15s;
  z-index:50;
}
.term-tip .bubble::after{
  content:'';position:absolute;top:100%;left:50%;transform:translateX(-50%);
  border:5px solid transparent;border-top-color:var(--ink-900);
}
.term-tip .bubble .tip-link{
  display:block;margin-top:6px;padding-top:6px;
  border-top:1px solid rgba(255,255,255,.15);
  font:600 11px/1.3 var(--font-mono);color:var(--coral-500);cursor:pointer;
}
.term-tip:hover .bubble,.term-tip:focus .bubble{opacity:1;pointer-events:auto}

/* ============ Tables ============ */
.tbl{width:100%;border-collapse:collapse;margin:16px 0;font-size:14px}
.tbl th,.tbl td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--border-subtle)}
.tbl th{background:var(--sunken);font:600 13px/1.4 var(--font-sans);color:var(--ink-900);letter-spacing:-.005em}
.tbl td{color:var(--text-body)}
.tbl td.num{font-family:var(--font-mono);font-weight:600;color:var(--ink-900);text-align:right}
.tbl tr:last-child td{border-bottom:none}
.tbl.compact th,.tbl.compact td{padding:8px 12px;font-size:13px}

/* ============ Timeline (Visit quiz) — 재설계 ============ */
.timeline-wrap{
  background:var(--surface);border-radius:var(--r-lg);padding:24px;margin:24px 0;
  border:1px solid var(--border);box-shadow:var(--shadow-1);
}
.timeline-title{
  font:700 15px/1.3 var(--font-sans);color:var(--ink-900);margin-bottom:6px;
  display:flex;align-items:center;gap:8px;letter-spacing:-.01em;
}
.timeline-sub{font:400 13.5px/1.5 var(--font-sans);color:var(--text-muted);margin-bottom:20px}
.tl-legend{
  display:flex;gap:16px;flex-wrap:wrap;margin-bottom:16px;
  padding:10px 14px;background:var(--sunken);border-radius:var(--r-md);
}
.tl-legend .item{display:flex;align-items:center;gap:8px;font:500 12.5px/1 var(--font-sans);color:var(--text-body)}
.tl-legend .swatch{width:12px;height:12px;border-radius:99px}
.tl-legend .swatch.event{background:var(--coral-500)}
.tl-legend .swatch.leave{background:var(--ink-300)}
.tl-legend .swatch.session{background:transparent;border:2px solid var(--blue-500);border-radius:4px}

.tl-timeline{position:relative;padding:20px 8px 40px;overflow-x:auto}
.tl-canvas{position:relative;min-width:640px;height:170px}
.tl-hour-marks{position:absolute;top:0;left:0;right:0;height:14px}
.tl-hour-marks .hm{
  position:absolute;top:0;transform:translateX(-50%);
  font:600 11px/1 var(--font-mono);color:var(--text-faint);
}
.tl-hour-marks .hm::after{content:'';display:block;width:1px;height:6px;background:var(--line-200);margin:4px auto 0}
.tl-axis-line{
  position:absolute;top:78px;left:0;right:0;height:2px;
  background:linear-gradient(90deg,var(--line-200),var(--ink-300) 20%,var(--ink-300) 80%,var(--line-200));
}

.tl-session-bracket{
  position:absolute;top:56px;height:44px;
  background:var(--blue-50);border:2px solid var(--blue-500);border-radius:8px;
  z-index:1;transition:all .18s;
}
.tl-session-bracket:hover{background:var(--blue-100);box-shadow:0 4px 12px rgba(61,107,255,.2)}
.tl-session-bracket .sess-label{
  position:absolute;top:-10px;left:50%;transform:translateX(-50%);
  font:700 11px/1 var(--font-mono);color:#fff;letter-spacing:.02em;
  background:var(--blue-500);padding:4px 10px;border-radius:99px;white-space:nowrap;
}

.tl-event{
  position:absolute;top:38px;transform:translateX(-50%);
  display:flex;flex-direction:column;align-items:center;gap:4px;
  z-index:2;
}
.tl-event .dot{
  width:16px;height:16px;border-radius:99px;background:var(--coral-500);
  border:3px solid var(--surface);box-shadow:0 0 0 1.5px var(--coral-500),var(--shadow-1);
  margin-top:34px;position:relative;z-index:3;
}
.tl-event .time{
  font:700 11px/1 var(--font-mono);color:var(--ink-900);margin-top:10px;
  background:var(--surface);padding:2px 6px;border-radius:6px;
  border:1px solid var(--border-subtle);
}
.tl-event .label{
  font:500 11.5px/1.3 var(--font-sans);color:var(--text-muted);
  margin-top:3px;white-space:nowrap;
}
.tl-event.leave .dot{background:var(--ink-400);box-shadow:0 0 0 1.5px var(--ink-400),var(--shadow-1)}
.tl-event.leave .label{color:var(--text-faint);font-style:italic}

@media (max-width:768px){
  .tl-timeline{padding:12px 4px 32px}
  .tl-legend{gap:12px;font-size:11.5px}
}

/* ============ Toggle grid controls ============ */
.term-controls{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  margin:16px 0 10px;
}
.term-controls .count{font:500 13px/1 var(--font-sans);color:var(--text-muted)}
.term-controls .term-search{
  flex:1;max-width:240px;height:34px;padding:0 12px;
  border:1px solid var(--border);border-radius:var(--r-md);
  background:var(--surface);color:var(--ink-900);
  font:400 13px/1 var(--font-sans);
}
.term-controls .term-search:focus{outline:none;border-color:var(--blue-500);box-shadow:var(--focus-ring)}
.term-controls .toggle-all{
  height:34px;padding:0 12px;border:1px solid var(--border);border-radius:var(--r-md);
  background:var(--surface);color:var(--text-body);
  font:600 12.5px/1 var(--font-sans);cursor:pointer;transition:background .12s;
  display:inline-flex;align-items:center;gap:6px;
}
.term-controls .toggle-all:hover{background:var(--sunken);color:var(--ink-900)}
.term.hidden{display:none}

/* ============ Sidebar drawer for mobile ============ */
.overlay{position:fixed;inset:0;background:rgba(31,30,28,.4);z-index:29;opacity:0;pointer-events:none;transition:opacity .2s}
.overlay.show{opacity:1;pointer-events:auto}

/* ============ Info card (준비물 · 아코디언식) ============ */
.info-cards{display:flex;flex-direction:column;gap:12px;margin:16px 0}
.info-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);
  overflow:hidden;transition:border-color .12s,box-shadow .12s;
}
.info-card:hover{border-color:var(--ink-300);box-shadow:var(--shadow-1)}
.info-card.open{border-color:var(--coral-500);box-shadow:var(--shadow-2)}
.info-card-head{
  display:flex;align-items:center;gap:14px;
  padding:16px 20px;cursor:pointer;background:transparent;border:none;width:100%;text-align:left;
  transition:background .12s;
}
.info-card-head:hover{background:var(--sunken)}
.info-card-head .emo{font-size:22px;line-height:1;flex-shrink:0}
.info-card-head .txt{flex:1;min-width:0}
.info-card-head .t1{font:600 15px/1.35 var(--font-sans);color:var(--ink-900);letter-spacing:-.005em}
.info-card-head .t2{font:400 13px/1.4 var(--font-sans);color:var(--text-muted);margin-top:2px}
.info-card-head .chev{color:var(--text-muted);transition:transform .18s;flex-shrink:0}
.info-card.open .info-card-head .chev{transform:rotate(180deg)}
.info-card-body{
  max-height:0;overflow:hidden;transition:max-height .3s ease-out;
  border-top:1px dashed transparent;
}
.info-card.open .info-card-body{
  max-height:600px;border-top-color:var(--border-subtle);
}
.info-card-body-inner{padding:16px 20px 18px}
.info-card-body p{font:400 14.5px/1.65 var(--font-sans);color:var(--text-body);margin:0 0 10px}
.info-card-body p:last-child{margin-bottom:0}
.info-card-body code{
  display:inline-block;padding:3px 8px;background:var(--sunken);border-radius:6px;
  font:500 12.5px/1 var(--font-mono);color:var(--ink-900);letter-spacing:-.01em;
}
.info-card-body .subhead{
  font:700 12px/1 var(--font-sans);color:var(--text-muted);letter-spacing:.06em;text-transform:uppercase;
  margin:14px 0 8px;
}
.info-card-body .issue{
  padding:10px 12px;background:var(--sunken);border-radius:var(--r-sm);margin-bottom:6px;
  font:400 13.5px/1.55 var(--font-sans);
}
.info-card-body .issue strong{display:block;color:var(--ink-900);font-weight:600;margin-bottom:2px}
.info-card-body .issue .fix{color:var(--text-muted)}
.info-card-body .fix::before{content:'→ ';color:var(--coral-500);font-weight:600}
.info-card-body .copy-btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 10px;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-sm);
  color:var(--text-body);font:500 12px/1 var(--font-sans);cursor:pointer;
  margin-left:8px;transition:all .12s;vertical-align:middle;
}
.info-card-body .copy-btn:hover{background:var(--sunken);color:var(--ink-900);border-color:var(--ink-300)}
.info-card-body .copy-btn.copied{background:var(--green-50);color:var(--green-600);border-color:var(--green-100)}

/* ============ Prereq checklist (legacy — 지금 안 씀) ============ */
.checklist{display:flex;flex-direction:column;gap:10px;margin:16px 0}

/* ============ Nav (lesson prev/next — 문맥형) ============ */
.lesson-nav{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:48px;padding-top:24px;border-top:1px solid var(--border-subtle)}
.lesson-nav a{
  display:flex;flex-direction:column;gap:6px;
  padding:18px 22px;
  border:1px solid var(--border);border-radius:var(--r-md);
  background:var(--surface);color:var(--text-body);
  transition:all .18s;
  text-decoration:none;position:relative;
}
.lesson-nav a:hover{border-color:var(--coral-500);background:var(--coral-50);text-decoration:none;transform:translateY(-2px);box-shadow:var(--shadow-2)}
.lesson-nav a .dir{
  display:inline-flex;align-items:center;gap:6px;
  font:600 12px/1 var(--font-sans);color:var(--text-muted);letter-spacing:-.005em;
}
.lesson-nav a:hover .dir{color:var(--coral-600)}
.lesson-nav a .ttl{font:700 15px/1.4 var(--font-sans);color:var(--ink-900);letter-spacing:-.01em}
.lesson-nav a.right{text-align:right;align-items:flex-end}
.lesson-nav .placeholder{opacity:0;pointer-events:none}

/* Post-completion banner */
.done-banner{
  margin-top:24px;padding:20px 24px;
  background:linear-gradient(135deg,var(--green-50) 0%,var(--coral-50) 100%);
  border:1px solid var(--green-100);border-radius:var(--r-lg);
  display:flex;align-items:center;gap:16px;
  animation:slideUp .3s ease-out;
}
@keyframes slideUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.done-banner .emo{font-size:32px;line-height:1;flex-shrink:0}
.done-banner .body{flex:1;min-width:0}
.done-banner .title{font:700 15px/1.35 var(--font-sans);color:var(--ink-900);margin-bottom:2px;letter-spacing:-.01em}
.done-banner .sub{font:400 13.5px/1.5 var(--font-sans);color:var(--text-body)}
.done-banner .btn{flex-shrink:0}

/* Lesson done card (강조된 큰 CTA) */
.done-card{
  margin-top:40px;padding:24px;
  background:linear-gradient(180deg,var(--sunken) 0%,var(--surface) 100%);
  border:1.5px dashed var(--coral-200,var(--coral-100));
  border-radius:var(--r-lg);
  text-align:center;
  transition:all .2s;
}
.done-card.done{
  background:linear-gradient(180deg,var(--green-50) 0%,var(--surface) 100%);
  border:1px solid var(--green-100);border-style:solid;
}
.done-card .prompt{
  font:500 14px/1.5 var(--font-sans);color:var(--text-muted);margin-bottom:12px;
}
.done-card.done .prompt{color:var(--green-600);font-weight:600}
.done-card .btn{min-width:220px}

/* ============ Lesson header ============ */
.lesson-header{margin-bottom:32px;padding-bottom:20px;border-bottom:1px solid var(--border-subtle);position:relative}
.lesson-header .meta{display:flex;gap:8px;margin-bottom:12px;flex-wrap:wrap;align-items:center}
.lesson-header .title-row{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}
.lesson-header h1{font-size:36px;line-height:1.2;margin-bottom:8px;flex:1;min-width:0}
.lesson-header .lead{font-size:17px;line-height:1.65;color:var(--text-body);margin:0}
.lesson-header .star-btn.lg{margin-top:2px;flex-shrink:0}
.section-h{font:800 12px/1 var(--font-sans);letter-spacing:.14em;color:var(--coral-600);text-transform:uppercase;margin:36px 0 10px}

/* ============ Table of section ============ */
.section-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin:16px 0}
.section-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-md);
  padding:16px 18px;
}
.section-card h4{font-size:15px;margin-bottom:6px}
.section-card p{font-size:14px;color:var(--text-muted);margin:0;line-height:1.55}

/* ============ Completion badge screen ============ */
.completion{
  padding:60px 40px;text-align:center;
  background:linear-gradient(180deg,var(--coral-50),var(--paper));
  border:1px solid var(--coral-100);border-radius:var(--r-xl);
  margin:32px 0;
}
.completion .medal{font-size:80px;margin-bottom:16px;display:inline-block;animation:bounce 1.4s ease-out infinite}
@keyframes bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
.completion h2{font-size:32px;margin-bottom:12px;color:var(--ink-900)}
.completion p{font-size:16px;color:var(--text-body);max-width:520px;margin:0 auto}

/* ============ Search (glossary) ============ */
.search-wrap{display:flex;gap:12px;margin-bottom:20px;flex-wrap:wrap;align-items:center}
.search{
  flex:1;min-width:240px;height:44px;padding:0 16px;
  border:1px solid var(--border);border-radius:var(--r-md);
  background:var(--surface);color:var(--ink-900);
  font:400 15px/1 var(--font-sans);
  transition:border-color .12s,box-shadow .12s;
}
.search:focus{outline:none;border-color:var(--blue-500);box-shadow:var(--focus-ring)}
.filter-chips{display:flex;gap:6px;flex-wrap:wrap}
.filter-chip{
  padding:6px 12px;border-radius:var(--r-full);
  background:var(--sunken);border:none;color:var(--text-body);
  font:500 13px/1 var(--font-sans);cursor:pointer;transition:all .12s;
}
.filter-chip:hover{background:var(--line-100)}
.filter-chip.active{background:var(--ink-900);color:#F5F2EA}

.glossary-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}
.gl-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-md);
  padding:16px 18px;display:flex;flex-direction:column;gap:6px;
  transition:border-color .12s,box-shadow .12s;position:relative;
}
.gl-card .star-btn{position:absolute;top:8px;right:8px}
.gl-card:hover{border-color:var(--ink-300);box-shadow:var(--shadow-1)}
.gl-card .gl-name{font:700 15px/1.3 var(--font-sans);color:var(--ink-900);padding-right:32px}
.gl-card .gl-en{font:500 11px/1 var(--font-mono);color:var(--text-muted);margin-left:6px}
.gl-card .gl-def{font:400 13.5px/1.55 var(--font-sans);color:var(--text-body);margin:0}
.gl-card .gl-link{
  font:600 12px/1 var(--font-sans);color:var(--coral-600);
  margin-top:4px;cursor:pointer;text-decoration:none;
  display:inline-flex;align-items:center;gap:4px;
}
.gl-card .gl-link:hover{color:var(--coral-600);text-decoration:underline}

/* ============ Accordion ============ */
.acc{border:1px solid var(--border);border-radius:var(--r-md);margin:10px 0;overflow:hidden;background:var(--surface)}
.acc-head{
  display:flex;justify-content:space-between;align-items:center;gap:12px;
  padding:14px 18px;background:var(--surface);border:none;width:100%;text-align:left;cursor:pointer;
  font:600 15px/1.35 var(--font-sans);color:var(--ink-900);
}
.acc-head:hover{background:var(--sunken)}
.acc-head .chev{transition:transform .18s;color:var(--text-muted)}
.acc.open .acc-head .chev{transform:rotate(180deg)}
.acc-body{max-height:0;overflow:hidden;transition:max-height .3s ease-out;padding:0 18px}
.acc.open .acc-body{max-height:2000px;padding:0 18px 18px}
.acc-body p{margin:10px 0 0}
.acc-body ol{margin:8px 0 0;padding-left:1.25em}
.acc-body li{margin:6px 0;line-height:1.6}

/* ============ Diagram (flow) ============ */
.flow-diagram{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  padding:24px 16px;background:var(--sunken);border-radius:var(--r-lg);
  margin:16px 0;border:1px solid var(--border-subtle);
}
.flow-node{
  padding:10px 14px;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--r-md);font:600 13px/1.35 var(--font-sans);color:var(--ink-900);
  box-shadow:var(--shadow-1);
}
.flow-arrow{color:var(--ink-400);font-size:18px;font-family:var(--font-mono)}

/* ============ Workspace map ============ */
.ws-map{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);
  padding:0;margin:24px 0;overflow:hidden;box-shadow:var(--shadow-1);
}
.ws-map-toolbar{
  display:flex;align-items:center;gap:8px;padding:10px 16px;
  background:var(--sunken);border-bottom:1px solid var(--border-subtle);
  font:500 12.5px/1 var(--font-sans);color:var(--text-muted);
}
.ws-map-toolbar .dots{display:flex;gap:5px}
.ws-map-toolbar .dots span{width:9px;height:9px;border-radius:99px;background:var(--ink-300)}
.ws-map-toolbar .dots span:nth-child(1){background:#FF6058}
.ws-map-toolbar .dots span:nth-child(2){background:#FEBD2E}
.ws-map-toolbar .dots span:nth-child(3){background:#28C93F}
.ws-map-toolbar .menu{
  display:flex;gap:14px;margin-left:10px;
  font:500 12px/1 var(--font-sans);color:var(--text-muted);
}
.ws-map-body{
  display:grid;grid-template-columns:200px 1fr;min-height:400px;
}
.ws-map-left{
  background:var(--sunken);border-right:1px solid var(--border-subtle);
  padding:16px 12px;display:flex;flex-direction:column;gap:12px;
}
.ws-map-left .group-title{
  font:700 10.5px/1 var(--font-sans);color:var(--text-muted);letter-spacing:.08em;text-transform:uppercase;padding:0 4px;
}
.ws-map-chip{
  display:flex;align-items:center;gap:8px;padding:8px 10px;
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-sm);
  cursor:pointer;transition:all .15s;text-align:left;
  font:500 13px/1.35 var(--font-sans);color:var(--ink-900);
  position:relative;
}
.ws-map-chip:hover{border-color:var(--coral-500);background:var(--coral-50);color:var(--coral-600);transform:translateX(2px)}
.ws-map-chip .emo{font-size:14px;line-height:1}
.ws-map-chip .arrow{
  margin-left:auto;color:var(--text-faint);opacity:0;transition:opacity .12s,transform .15s;
}
.ws-map-chip:hover .arrow{opacity:1;transform:translateX(2px);color:var(--coral-500)}

.ws-map-right{padding:16px 20px;position:relative}
.ws-map-panel{
  background:var(--surface);border:2px dashed var(--border);border-radius:var(--r-md);
  padding:16px;cursor:pointer;transition:all .15s;position:relative;
}
.ws-map-panel:hover{border-color:var(--coral-500);border-style:solid;background:var(--coral-50)}
.ws-map-panel .label{
  position:absolute;top:-10px;left:12px;
  padding:2px 10px;background:var(--surface);border:1px solid var(--border);border-radius:99px;
  font:700 11px/1 var(--font-sans);color:var(--text-muted);letter-spacing:.02em;
}
.ws-map-panel:hover .label{border-color:var(--coral-500);color:var(--coral-600);background:var(--surface)}
.ws-map-panel .arrow{
  position:absolute;top:8px;right:12px;opacity:0;color:var(--coral-500);
  font:600 11px/1 var(--font-sans);transition:opacity .12s;
}
.ws-map-panel:hover .arrow{opacity:1}

.ws-map-viz{
  margin-top:16px;background:var(--surface);border:2px dashed var(--border);border-radius:var(--r-sm);
  padding:14px;cursor:pointer;transition:all .15s;position:relative;
}
.ws-map-viz:hover{border-color:var(--blue-500);border-style:solid;background:var(--blue-50)}
.ws-map-viz .label{
  position:absolute;top:-10px;left:12px;padding:2px 10px;background:var(--surface);
  border:1px solid var(--border);border-radius:99px;font:700 11px/1 var(--font-sans);color:var(--text-muted);
}
.ws-map-viz:hover .label{border-color:var(--blue-500);color:var(--blue-600)}
.ws-map-viz .arrow{position:absolute;top:8px;right:12px;opacity:0;color:var(--blue-500);font:600 11px/1 var(--font-sans);transition:opacity .12s}
.ws-map-viz:hover .arrow{opacity:1}
.ws-map-table{
  width:100%;border-collapse:collapse;margin-top:12px;font-size:12.5px;
}
.ws-map-table th,.ws-map-table td{
  padding:6px 10px;text-align:left;border-bottom:1px solid var(--border-subtle);
}
.ws-map-table th{background:var(--sunken);font:600 11.5px/1 var(--font-sans);color:var(--ink-900)}
.ws-map-table td.num{text-align:right;font-family:var(--font-mono);color:var(--ink-900);font-weight:500}

.ws-map-hint{
  margin:16px 20px 20px;padding:12px 16px;
  background:var(--coral-50);border-left:3px solid var(--coral-500);border-radius:var(--r-sm);
  font:400 13px/1.55 var(--font-sans);color:var(--ink-900);
}
.ws-map-hint strong{color:var(--coral-600)}

.ws-map-cta{
  display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
  margin-top:24px;padding:20px 24px;
  background:linear-gradient(180deg,var(--sunken),var(--surface));
  border:1px solid var(--border);border-radius:var(--r-lg);
}
.ws-map-cta .lead{font:500 14.5px/1.5 var(--font-sans);color:var(--ink-900);flex:1;min-width:220px}
.ws-map-cta .lead strong{color:var(--coral-600)}

@media (max-width:768px){
  .ws-map-body{grid-template-columns:1fr}
  .ws-map-left{border-right:none;border-bottom:1px solid var(--border-subtle)}
}

/* ============ Diagnostic cards (숫자 이상 문진) ============ */
.diag-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:16px 0}
@media (max-width:640px){.diag-grid{grid-template-columns:1fr}}
.diag-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);
  padding:20px 22px;cursor:pointer;transition:all .18s;
  display:flex;flex-direction:column;gap:10px;text-align:left;
}
.diag-card:hover{transform:translateY(-2px);border-color:var(--coral-500);box-shadow:var(--shadow-2)}
.diag-card .num{
  width:28px;height:28px;border-radius:99px;background:var(--coral-50);color:var(--coral-600);
  display:flex;align-items:center;justify-content:center;font:800 14px/1 var(--font-mono);
}
.diag-card .q{font:700 15px/1.4 var(--font-sans);color:var(--ink-900);letter-spacing:-.01em}
.diag-card .cause,.diag-card .check{font:400 13px/1.55 var(--font-sans);color:var(--text-body)}
.diag-card .cause strong,.diag-card .check strong{color:var(--ink-900);font-weight:600;display:block;margin-bottom:2px;font-size:11.5px;letter-spacing:.04em;text-transform:uppercase;color:var(--text-muted)}
.diag-card .expand-note{font:500 12px/1 var(--font-sans);color:var(--coral-600);margin-top:auto}

/* ============ Back link (부록 상단) ============ */
.back-link{
  display:inline-flex;align-items:center;gap:6px;
  font:500 13px/1 var(--font-sans);color:var(--text-muted);
  text-decoration:none;padding:6px 12px;border-radius:var(--r-sm);
  background:var(--sunken);margin-bottom:16px;transition:all .12s;
}
.back-link:hover{background:var(--line-100);color:var(--ink-900);text-decoration:none}

/* ============ Related (부록 하단 · 이 개념이 나오는 실행) ============ */
.related-box{
  margin-top:32px;padding:20px 24px;
  background:var(--blue-50);border:1px solid var(--blue-100);border-radius:var(--r-lg);
}
.related-box .rb-title{
  display:flex;align-items:center;gap:8px;
  font:700 12px/1 var(--font-sans);color:var(--blue-600);letter-spacing:.08em;text-transform:uppercase;margin-bottom:12px;
}
.related-box .rb-list{display:flex;flex-direction:column;gap:8px}
.related-box .rb-item{
  display:flex;align-items:center;gap:10px;padding:10px 14px;
  background:var(--surface);border:1px solid var(--blue-100);border-radius:var(--r-md);
  text-decoration:none;color:var(--ink-900);transition:all .12s;
}
.related-box .rb-item:hover{border-color:var(--blue-500);background:var(--surface);transform:translateX(3px);text-decoration:none}
.related-box .rb-item .emo{font-size:16px;flex-shrink:0}
.related-box .rb-item .txt{flex:1;font:500 14px/1.35 var(--font-sans)}
.related-box .rb-item .go{color:var(--blue-600);font:600 12px/1 var(--font-sans)}

/* ============ Big number visual ============ */
.big-num{
  padding:32px 28px;text-align:center;background:var(--surface);
  border:1px solid var(--border);border-radius:var(--r-lg);margin:20px 0;
  box-shadow:var(--shadow-1);
}
.big-num .num{font:800 72px/1 var(--font-mono);color:var(--coral-500);letter-spacing:-.03em;margin-bottom:8px}
.big-num .caption{font:500 15px/1.5 var(--font-sans);color:var(--text-body);max-width:420px;margin:0 auto}

/* ============ Rule cards (drag&drop) ============ */
.rule-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-md);
  padding:16px 18px;margin:12px 0;display:flex;gap:14px;align-items:flex-start;
}
.rule-card .r-ico{
  width:32px;height:32px;border-radius:var(--r-full);flex-shrink:0;
  display:flex;align-items:center;justify-content:center;font-size:16px;
  background:var(--blue-50);color:var(--blue-600);
}
.rule-card .r-body{flex:1}
.rule-card .r-title{font:700 15px/1.35 var(--font-sans);color:var(--ink-900);margin-bottom:4px}
.rule-card .r-desc{font:400 14px/1.6 var(--font-sans);color:var(--text-body);margin:0}
.rule-card.dim .r-ico{background:var(--coral-50);color:var(--coral-600)}
.rule-card.met .r-ico{background:var(--green-50);color:var(--green-600)}
.rule-card.seg .r-ico{background:var(--amber-50);color:var(--amber-600)}

/* ============ Layout responsive ============ */
@media (max-width:1024px){
  .hero{grid-template-columns:1fr;gap:32px;padding:48px 32px 24px}
  .hero-art{max-width:320px;justify-self:center}
  .hero h1{font-size:42px}
  .grid-3{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .roadmap-track{grid-template-columns:repeat(2,1fr)}
  .roadmap-track::before{display:none}
}
@media (max-width:768px){
  body{font-size:15px}
  .app{grid-template-columns:1fr}
  .sidebar{
    position:fixed;top:0;left:0;height:100vh;width:280px;
    transform:translateX(-100%);transition:transform .25s ease-out;
  }
  .sidebar.open{transform:translateX(0);box-shadow:var(--shadow-4)}
  .sidebar-resizer{display:none}
  .hamburger{display:inline-flex}
  .hero{padding:36px 20px 20px}
  .hero h1{font-size:32px}
  .hero .sub{font-size:16px}
  .page{padding:28px 20px 80px}
  .topbar{padding:0 20px}
  .roadmap-track{grid-template-columns:1fr}
  .lesson-header h1{font-size:28px}
  h2{font-size:26px}
  .big-num .num{font-size:56px}
  .lesson-nav{flex-direction:column}
  .lesson-nav a,.lesson-nav .placeholder{max-width:none}
}

.progress-frac{ font-variant-numeric: tabular-nums; font-weight: 700; letter-spacing: -0.02em; }