*{margin:0;padding:0;box-sizing:border-box}
:root{--bg:#0b0f19;--surface:#111827;--surface2:#1e293b;--primary:#eab308;--primary-soft:rgba(234,179,8,.14);--secondary:#8b5cf6;--success:#10b981;--text:#f1f5f9;--text2:#94a3b8;--warning:#f59e0b;--border:rgba(255,255,255,0.06);--border2:rgba(255,255,255,0.08);--footer:#080c14;--spine:rgba(255,255,255,.14)}
body.light-mode{--bg:#f0f4f8;--surface:#ffffff;--surface2:#e2e8f0;--primary:#a16207;--primary-soft:rgba(161,98,7,.12);--secondary:#7c3aed;--success:#059669;--text:#0f172a;--text2:#334155;--warning:#d97706;--border:rgba(0,0,0,0.10);--border2:rgba(0,0,0,0.12);--footer:#e2e8f0;--spine:rgba(0,0,0,.16)}
body.light-mode .navbar{background:rgba(255,255,255,.92);border-bottom-color:rgba(0,0,0,.08)}
body.light-mode .nav-logo{color:#0f172a}body.light-mode .nav-links a{color:#334155}
body.light-mode .hero h1{background:linear-gradient(135deg,#0f172a,#a16207);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
body.light-mode .mobile-menu{background:rgba(255,255,255,.98)}body.light-mode .mobile-menu a{color:#334155}
body.light-mode .theme-toggle{color:#334155;border-color:rgba(0,0,0,.12)}
body.light-mode .scroll-top{background:#fff;border-color:rgba(0,0,0,.08);color:#334155}
html{scroll-behavior:smooth}
body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);line-height:1.7;overflow-x:hidden}
a{color:var(--primary);text-decoration:none;transition:color .2s}ul{list-style:none;padding:0}
.navbar{position:fixed;top:0;left:0;right:0;background:rgba(11,15,25,.9);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);z-index:1000;padding:0 24px}
.nav-inner{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;height:64px}
.nav-logo{font-size:1.15rem;font-weight:700;color:var(--text);display:flex;align-items:center;gap:10px;text-decoration:none}
.nav-logo i{color:var(--primary);font-size:1.3rem}
.nav-links{display:flex;gap:8px}
.nav-links a{color:var(--text2);padding:8px 16px;border-radius:8px;font-size:.875rem;font-weight:500;transition:all .2s}
.nav-links a:hover{color:var(--text);background:rgba(255,255,255,.05)}
.theme-toggle{background:none;border:1px solid var(--border2);color:var(--text2);width:36px;height:36px;border-radius:8px;cursor:pointer;font-size:1rem;display:flex;align-items:center;justify-content:center;transition:all .2s;margin-left:4px}
.theme-toggle:hover{border-color:var(--primary);color:var(--primary)}
.hamburger{display:none;background:none;border:none;color:var(--text);font-size:1.25rem;cursor:pointer;padding:8px}
.mobile-menu{display:none;position:fixed;top:64px;left:0;right:0;background:rgba(11,15,25,.98);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);padding:16px 24px;flex-direction:column;gap:4px;z-index:999}
.mobile-menu.open{display:flex}
.hero{margin-top:64px;padding:64px 24px 32px;text-align:center;position:relative}
.hero h1{font-size:2.6rem;font-weight:800;letter-spacing:-.02em;line-height:1.15;margin-bottom:12px;background:linear-gradient(135deg,var(--text),#eab308);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-sub{font-size:1.05rem;color:var(--text2);max-width:680px;margin:0 auto}
.footer{background:var(--footer);border-top:1px solid var(--border);margin-top:64px}
.footer-bottom{padding:20px 24px;text-align:center;color:var(--text2);font-size:.8rem}
.scroll-top{position:fixed;bottom:28px;left:28px;width:44px;height:44px;border-radius:10px;background:var(--surface);border:1px solid var(--border2);color:var(--text2);display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:1rem;transition:all .2s;opacity:0;pointer-events:none;z-index:900}
.scroll-top.visible{opacity:1;pointer-events:auto}
.scroll-top:hover{border-color:var(--primary);color:var(--primary)}

/* ===== progress header ===== */
.rm-progressbar{max-width:760px;margin:28px auto 0;padding:0 24px}
.rm-progress-row{display:flex;justify-content:space-between;align-items:center;font-size:.85rem;color:var(--text2);margin-bottom:8px}
.rm-progress-row strong{color:var(--text)}
.rm-track{height:10px;background:var(--surface2);border-radius:6px;overflow:hidden;border:1px solid var(--border2)}
.rm-fill{height:100%;width:0;background:linear-gradient(90deg,var(--success),#34d399);border-radius:6px;transition:width .4s ease}
.rm-legend{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-top:14px;font-size:.78rem;color:var(--text2)}
.rm-legend span{display:flex;align-items:center;gap:6px}
.dot{width:10px;height:10px;border-radius:50%;display:inline-block}
.dot-pending{background:var(--surface2);border:1px solid var(--border2)}
.dot-learning{background:var(--warning)}
.dot-done{background:var(--success)}
.dot-skip{background:var(--text2);opacity:.5}
.rm-reset{background:none;border:1px solid var(--border2);color:var(--text2);padding:5px 12px;border-radius:8px;font-size:.75rem;cursor:pointer;font-family:inherit;transition:all .2s}
.rm-reset:hover{border-color:#ef4444;color:#ef4444}

/* ===== the roadmap ===== */
.rm-wrap{max-width:860px;margin:24px auto 0;padding:0 24px;position:relative}
.rm-spine{position:relative;padding:24px 0}
.rm-spine::before{content:'';position:absolute;top:0;bottom:0;left:50%;width:3px;transform:translateX(-50%);background:var(--spine);border-radius:2px}
.rm-group{position:relative;margin-bottom:8px}
.rm-group-node{position:relative;z-index:2;display:block;margin:0 auto 20px;width:max-content;max-width:90%;background:var(--primary);color:#0b0f19;font-weight:800;font-size:1rem;padding:12px 26px;border-radius:12px;text-align:center;box-shadow:0 4px 18px rgba(234,179,8,.25)}
body.light-mode .rm-group-node{color:#fff}
.rm-children{display:grid;grid-template-columns:1fr 80px 1fr;row-gap:14px;margin-bottom:28px}
.rm-node{position:relative;z-index:2;display:flex;align-items:center;gap:10px;background:var(--surface);border:1.5px solid var(--border2);border-radius:12px;padding:12px 16px;cursor:pointer;font-family:inherit;font-size:.9rem;font-weight:600;color:var(--text);text-align:left;transition:border-color .2s,transform .15s,opacity .2s;width:100%}
.rm-node:hover{border-color:var(--primary);transform:translateY(-2px)}
.rm-node .rm-check{flex-shrink:0;width:20px;height:20px;border-radius:50%;border:2px solid var(--border2);display:flex;align-items:center;justify-content:center;font-size:.6rem;color:transparent;transition:all .2s}
.rm-node .rm-label{flex:1;line-height:1.4}
.rm-node.left{grid-column:1;justify-self:end}
.rm-node.right{grid-column:3;justify-self:start}
.rm-node.left::after,.rm-node.right::before{content:'';position:absolute;top:50%;width:44px;height:2px;background:var(--spine);z-index:-1}
.rm-node.left::after{left:100%}
.rm-node.right::before{right:100%}
.rm-node[data-status="learning"]{border-color:var(--warning)}
.rm-node[data-status="learning"] .rm-check{border-color:var(--warning);color:var(--warning)}
.rm-node[data-status="done"]{border-color:var(--success)}
.rm-node[data-status="done"] .rm-check{background:var(--success);border-color:var(--success);color:#fff}
.rm-node[data-status="done"] .rm-label{color:var(--text2);text-decoration:line-through;text-decoration-color:rgba(148,163,184,.6)}
.rm-node[data-status="skip"]{opacity:.45}
.rm-node[data-status="skip"] .rm-label{text-decoration:line-through}

/* ===== drawer ===== */
.rm-overlay{position:fixed;inset:0;background:rgba(0,0,0,.55);opacity:0;pointer-events:none;transition:opacity .25s;z-index:1100}
.rm-overlay.open{opacity:1;pointer-events:auto}
.rm-drawer{position:fixed;top:0;right:-480px;bottom:0;width:460px;max-width:100vw;background:var(--surface);border-left:1px solid var(--border2);z-index:1200;transition:right .3s ease;display:flex;flex-direction:column}
.rm-drawer.open{right:0}
.rm-drawer-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;padding:22px 24px 0}
.rm-drawer-head h3{font-size:1.3rem;font-weight:800;line-height:1.3}
.rm-close{background:none;border:1px solid var(--border2);color:var(--text2);width:34px;height:34px;border-radius:8px;cursor:pointer;font-size:.95rem;flex-shrink:0;transition:all .2s}
.rm-close:hover{border-color:#ef4444;color:#ef4444}
.rm-drawer-body{padding:14px 24px 24px;overflow-y:auto;flex:1}
.rm-desc{color:var(--text2);font-size:.92rem;margin-bottom:20px}
.rm-status-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px}
.rm-status-btn{flex:1;min-width:90px;background:var(--surface2);border:1.5px solid var(--border2);color:var(--text2);padding:9px 10px;border-radius:9px;font-size:.78rem;font-weight:700;cursor:pointer;font-family:inherit;transition:all .2s;display:flex;align-items:center;justify-content:center;gap:6px}
.rm-status-btn:hover{color:var(--text)}
.rm-status-btn[data-s="learning"].active{background:rgba(245,158,11,.15);border-color:var(--warning);color:var(--warning)}
.rm-status-btn[data-s="done"].active{background:rgba(16,185,129,.15);border-color:var(--success);color:var(--success)}
.rm-status-btn[data-s="skip"].active{background:var(--surface2);border-color:var(--text2);color:var(--text)}
.rm-res-title{font-size:.78rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--text2);margin-bottom:10px}
.rm-res{display:flex;align-items:center;gap:12px;background:var(--surface2);border:1px solid var(--border2);border-radius:10px;padding:11px 14px;margin-bottom:8px;color:var(--text);font-size:.86rem;font-weight:600;transition:border-color .2s}
.rm-res:hover{border-color:var(--primary);color:var(--text)}
.rm-res i{color:var(--primary);width:18px;text-align:center;flex-shrink:0}
.rm-res .rm-res-tag{margin-left:auto;flex-shrink:0;font-size:.65rem;font-weight:800;letter-spacing:.04em;text-transform:uppercase;padding:3px 8px;border-radius:20px;background:var(--primary-soft);color:var(--primary)}
.rm-res .rm-res-tag.ext{background:rgba(139,92,246,.14);color:var(--secondary)}

@media(max-width:768px){
  .hero h1{font-size:1.9rem}
  .nav-links{display:none}.hamburger{display:block}
  .rm-spine::before{left:14px}
  .rm-children{grid-template-columns:1fr;row-gap:10px;padding-left:44px}
  .rm-node.left,.rm-node.right{grid-column:1;justify-self:stretch}
  .rm-node.left::after{display:none}
  .rm-node.right::before{right:100%;width:30px}
  .rm-node.left::before{content:'';position:absolute;top:50%;right:100%;width:30px;height:2px;background:var(--spine);z-index:-1}
  .rm-group-node{margin-left:44px;margin-right:0}
  .rm-drawer{width:100vw;right:-100vw}
}