:root{--bg:#08111f;--panel:#101d31;--panel2:#13243b;--text:#edf5ff;--muted:#9bb0ca;--line:#243955;--primary:#31d0aa;--primary2:#21a988;--danger:#fb7185;--warning:#fbbf24;--shadow:0 20px 50px #0005;--sidebar-bg:#091729;--sidebar-text:#dbe8f7;--sidebar-muted:#8297b2;--sidebar-hover:#132843;--sidebar-active:#dff8f0;--sidebar-active-text:#073a30}html[data-theme="light"]{--bg:#f3f7fb;--panel:#fff;--panel2:#eef4fa;--text:#152238;--muted:#62748a;--line:#d8e2ed;--shadow:0 18px 45px #20304018;--sidebar-bg:#f8fbff;--sidebar-text:#1c2b42;--sidebar-muted:#64758c;--sidebar-hover:#e8f1f8;--sidebar-active:#d8f5ec;--sidebar-active-text:#075a49}*{box-sizing:border-box}body{margin:0;font-family:Prompt,system-ui,sans-serif;background:var(--bg);color:var(--text)}button,input,textarea,select{font:inherit}.hidden{display:none!important}.app-shell{min-height:100vh;display:grid;grid-template-columns:280px minmax(0,1fr);transition:grid-template-columns .25s ease}.app-shell.sidebar-collapsed{grid-template-columns:0 minmax(0,1fr)}.sidebar{position:sticky;top:0;z-index:20;width:280px;height:100dvh;background:var(--sidebar-bg);color:var(--sidebar-text);border-right:1px solid var(--line);padding:18px;display:flex;flex-direction:column;overflow-y:auto;overflow-x:hidden;transition:transform .25s ease,visibility .25s ease,box-shadow .25s ease}.app-shell.sidebar-collapsed .sidebar{transform:translateX(-100%);visibility:hidden}.brand{display:flex;align-items:center;gap:10px}.brand>div:nth-child(2){display:grid}.brand span{font-size:12px;color:var(--sidebar-muted)}.brand-mark{width:42px;height:42px;border-radius:13px;background:linear-gradient(135deg,var(--primary),#3b82f6);display:grid;place-items:center;font-weight:900;color:#06231c}.brand-mark.large{width:68px;height:68px;border-radius:20px;font-size:24px}.main-nav{display:grid;gap:6px;margin:24px 0;flex:0 0 auto}.nav-item{width:100%;border:0;background:transparent;color:var(--sidebar-muted);padding:12px 14px;border-radius:12px;text-align:left;display:flex;align-items:center;gap:12px;cursor:pointer;transition:background .18s,color .18s,transform .18s}.nav-item:hover{background:var(--sidebar-hover);color:var(--sidebar-text);transform:translateX(2px)}.nav-item.active{background:var(--sidebar-active);color:var(--sidebar-active-text);font-weight:800;box-shadow:inset 4px 0 0 var(--primary)}.sidebar-section{margin-top:10px;flex:0 0 auto;min-height:0}.section-label,.eyebrow{font-size:11px;text-transform:uppercase;letter-spacing:.12em;color:var(--primary);font-weight:800}.recent-lessons{display:grid;gap:7px;margin-top:10px}.recent-lessons button{background:transparent;color:var(--sidebar-muted);border:0;text-align:left;cursor:pointer;padding:5px 0}.recent-lessons button:hover{color:var(--sidebar-text)}.sidebar-footer{margin-top:auto;display:grid;gap:8px;padding-top:18px;flex:0 0 auto}.main-content{min-width:0}.topbar{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);height:72px;padding:12px 24px;display:flex;align-items:center;gap:14px}.search-wrap{max-width:560px;flex:1;background:var(--panel);border:1px solid var(--line);border-radius:13px;padding:0 13px;display:flex;align-items:center;gap:9px}.search-wrap input{width:100%;padding:11px 0;background:transparent;border:0;color:var(--text);outline:0}.top-actions{margin-left:auto;display:flex;align-items:center;gap:8px}.icon-btn,.secondary-btn,.ghost-btn,.primary-btn{border-radius:11px;padding:10px 14px;cursor:pointer}.icon-btn{border:1px solid var(--line);background:var(--panel);color:var(--text)}.primary-btn{border:0;background:var(--primary);color:#03281f;font-weight:800}.primary-btn:hover{background:var(--primary2)}.secondary-btn,.ghost-btn{border:1px solid var(--line);background:var(--panel);color:var(--text)}.wide{width:100%}.file-label{text-align:center}.file-label input{display:none}.profile-chip{border:1px solid var(--line);background:var(--panel);color:var(--text);display:flex;align-items:center;gap:9px;border-radius:13px;padding:6px 10px;cursor:pointer}.profile-chip>span{width:34px;height:34px;border-radius:10px;background:var(--primary);color:#06231c;display:grid;place-items:center;font-weight:900}.profile-chip div{display:grid;text-align:left}.profile-chip small{color:var(--muted)}.sync-badge,.badge{font-size:12px;border:1px solid var(--line);background:var(--panel);padding:6px 9px;border-radius:999px;color:var(--muted)}.view{display:none;padding:26px}.view.active{display:block}.hero{display:grid;grid-template-columns:1.5fr .8fr;gap:18px}.hero-main,.hero-side,.panel,.phase-card,.project-card,.metric-card,.login-card{background:var(--panel);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}.hero-main,.hero-side,.panel{padding:26px}.hero h1{font-size:clamp(32px,5vw,58px);line-height:1.05;margin:12px 0}.hero p,.panel p,.phase-card p,.project-card p{color:var(--muted)}.hero-actions{display:flex;gap:10px;flex-wrap:wrap}.hero-side{display:grid;place-items:center}.ring{width:170px;height:170px;border-radius:50%;background:conic-gradient(var(--primary) var(--progress),var(--line) 0);display:grid;place-items:center}.ring:before{content:"";position:absolute;width:130px;height:130px;border-radius:50%;background:var(--panel)}.ring div{z-index:1;display:grid;text-align:center}.ring strong{font-size:34px}.stat-row{width:100%;display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.mini-stat{background:var(--panel2);padding:12px;border-radius:13px;text-align:center;display:grid}.mini-stat span{color:var(--muted);font-size:12px}.section-head{display:flex;justify-content:space-between;align-items:end;margin:28px 0 14px}.section-head h2{margin:4px 0}.section-head p{margin:0;color:var(--muted)}.phase-grid,.project-grid,.metric-grid,.admin-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:14px}.phase-card,.project-card,.metric-card{padding:18px}.phase-top,.phase-footer{display:flex;justify-content:space-between;align-items:center}.phase-icon,.big-icon{font-size:30px}.progress-track{height:8px;background:var(--line);border-radius:99px;overflow:hidden;margin:14px 0}.progress-bar{height:100%;background:var(--primary)}.lesson-list{display:grid;gap:8px}.lesson-row{display:grid;grid-template-columns:auto 1fr auto auto;gap:12px;align-items:center;padding:13px;border:1px solid var(--line);border-radius:13px}.lesson-row h4,.lesson-row p{margin:0}.lesson-row p,.lesson-meta{font-size:12px;color:var(--muted)}.lesson-status{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;border:1px solid var(--line)}.lesson-status.done{background:var(--primary);color:#06231c}.editor-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.editor-stack{display:grid;gap:10px}.editor-box textarea{width:100%;min-height:180px;background:#07111f;color:#dbeafe;border:1px solid var(--line);border-radius:12px;padding:13px;font-family:ui-monospace,Consolas,monospace;resize:vertical}.preview-frame{width:100%;height:510px;border:1px solid var(--line);border-radius:12px;background:white}.tabs{display:flex;gap:8px;flex-wrap:wrap}.tab{border:1px solid var(--line);background:var(--panel2);color:var(--text);padding:8px 12px;border-radius:9px;cursor:pointer}.tab.active{background:var(--primary);color:#06231c}.quiz-option{display:block;padding:11px;border:1px solid var(--line);border-radius:10px;margin:8px 0}.note-card,.user-row,.lesson-admin-row{border:1px solid var(--line);border-radius:12px;padding:14px;background:var(--panel2)}input,textarea,select{width:100%;background:var(--panel2);border:1px solid var(--line);color:var(--text);border-radius:10px;padding:11px}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.form-grid .full{grid-column:1/-1}.chat{display:grid;gap:10px;max-height:420px;overflow:auto;padding:10px}.message{max-width:82%;padding:12px 14px;border-radius:14px;white-space:pre-wrap}.message.user{margin-left:auto;background:var(--primary);color:#04251e}.message.ai{background:var(--panel2);border:1px solid var(--line)}.certificate{max-width:900px;margin:auto;padding:48px;text-align:center;background:#fff;color:#13233a;border:16px double #0f766e;border-radius:8px}.certificate h1{font-family:Georgia,serif;font-size:48px}.certificate .name{font-size:34px;font-weight:800;border-bottom:2px solid #0f766e;display:inline-block;padding:0 40px 8px}.login-screen{min-height:100vh;display:grid;place-items:center;padding:20px;background:radial-gradient(circle at top,#12365e,var(--bg) 55%)}.login-card{width:min(440px,100%);padding:30px;display:grid;gap:14px}.login-card h1{margin:0}.login-card label{display:grid;gap:6px}.demo-box{display:grid;background:var(--panel2);padding:12px;border-radius:12px;color:var(--muted);font-size:13px}.toast{position:fixed;right:20px;bottom:20px;z-index:99;background:#111827;color:white;padding:12px 16px;border-radius:12px;opacity:0;transform:translateY(20px);pointer-events:none;transition:.2s}.toast.show{opacity:1;transform:none}.modal{max-width:760px;width:calc(100% - 30px);border:1px solid var(--line);border-radius:18px;background:var(--panel);color:var(--text);padding:22px}.modal::backdrop{background:#0009}.empty{padding:18px;color:var(--muted);text-align:center}.warning{background:#fbbf2420;border:1px solid #fbbf2460;padding:12px;border-radius:10px}.mobile-only{display:none}
.menu-toggle{display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto}
.sidebar-backdrop{display:none;position:fixed;inset:0;z-index:15;border:0;background:#06101e80;backdrop-filter:blur(2px);cursor:pointer}
.sidebar-backdrop.show{display:block}
.sidebar::-webkit-scrollbar{width:8px}.sidebar::-webkit-scrollbar-thumb{background:var(--line);border-radius:99px}.sidebar::-webkit-scrollbar-track{background:transparent}
html[data-theme="light"] .sidebar .secondary-btn,html[data-theme="light"] .sidebar .ghost-btn{background:#fff;color:var(--sidebar-text);border-color:#cfdae7}
html[data-theme="light"] .sidebar .secondary-btn:hover,html[data-theme="light"] .sidebar .ghost-btn:hover{background:var(--sidebar-hover)}
@media(max-width:900px){.app-shell,.app-shell.sidebar-collapsed{grid-template-columns:1fr}.sidebar,.app-shell.sidebar-collapsed .sidebar{position:fixed;inset:0 auto 0 0;z-index:20;width:min(86vw,320px);height:100dvh;transform:translateX(-105%);visibility:visible;box-shadow:none}.sidebar.open,.app-shell.sidebar-collapsed .sidebar.open{transform:translateX(0);box-shadow:18px 0 45px #0006}.mobile-only{display:inline-flex}.topbar{padding:10px}.profile-chip div,.sync-badge{display:none}.view{padding:16px}.hero,.editor-grid{grid-template-columns:1fr}.lesson-row{grid-template-columns:auto 1fr}.lesson-row .lesson-meta,.lesson-row button{grid-column:2}.form-grid{grid-template-columns:1fr}.certificate{padding:20px}.certificate h1{font-size:32px}}
@media print{body *{visibility:hidden}.certificate,.certificate *{visibility:visible}.certificate{position:absolute;inset:0;max-width:none;border:12px double #0f766e}.sidebar,.topbar{display:none}}


/* v2.1.3 sequential lesson navigation and quiz gate */
.lesson-navigation{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:14px;margin:0 0 16px}.lesson-navigation.bottom{margin:16px 0 0}.lesson-navigation>div:last-child{text-align:right}.lesson-counter,.lesson-lock-note{color:var(--muted);font-weight:700;text-align:center}.lesson-nav-btn{min-width:130px}.lesson-complete-badge{display:inline-flex;align-items:center;padding:10px 14px;border-radius:999px;background:var(--surface-2);color:var(--muted);font-weight:800;border:1px solid var(--border)}.lesson-complete-badge.done{background:color-mix(in srgb,var(--primary) 18%,var(--surface));color:var(--primary)}.quiz-panel{border:2px solid color-mix(in srgb,var(--primary) 30%,var(--border))}.quiz-heading{display:flex;justify-content:space-between;gap:16px;align-items:flex-start;margin-bottom:12px}.quiz-question{border:1px solid var(--border);border-radius:16px;padding:16px;margin:14px 0;background:var(--surface-2)}.quiz-question legend{font-weight:800;padding:0 8px}.quiz-option{display:flex;align-items:flex-start;gap:9px;padding:10px 12px;margin:7px 0;border:1px solid var(--border);border-radius:12px;cursor:pointer;background:var(--surface)}.quiz-option:hover{border-color:var(--primary)}.quiz-option:has(input:checked){border-color:var(--primary);box-shadow:0 0 0 2px color-mix(in srgb,var(--primary) 18%,transparent)}.quiz-result{margin-top:14px}.quiz-success,.quiz-fail{padding:16px;border-radius:14px}.quiz-success{background:color-mix(in srgb,var(--primary) 15%,var(--surface));border:1px solid var(--primary)}.quiz-fail{background:color-mix(in srgb,var(--danger) 10%,var(--surface));border:1px solid var(--danger)}.quiz-passed{background:color-mix(in srgb,var(--primary) 16%,var(--surface));color:var(--primary)}
@media(max-width:700px){.lesson-navigation{grid-template-columns:1fr 1fr}.lesson-counter,.lesson-lock-note{grid-column:1/-1;grid-row:1}.lesson-navigation>div:first-child{grid-column:1}.lesson-navigation>div:last-child{grid-column:2}.lesson-nav-btn{width:100%;min-width:0}.quiz-heading{flex-direction:column}}


/* v2.1.4 Vibe Coding Project Lab */
.project-stack{display:block;color:var(--muted);min-height:38px}.project-card-footer{display:flex;align-items:center;justify-content:space-between;gap:10px;color:var(--muted);font-size:12px}.project-dialog-head{align-items:flex-start;margin-top:0}.project-dialog-head p{max-width:720px}.project-overview{display:grid;grid-template-columns:150px 150px minmax(250px,1fr);gap:10px;margin:14px 0}.project-overview>div{display:grid;gap:3px;padding:14px;border:1px solid var(--line);border-radius:13px;background:var(--panel2)}.project-overview strong{font-size:18px}.project-overview span{font-size:12px;color:var(--muted)}.project-guide{padding:14px;border:1px solid color-mix(in srgb,var(--primary) 45%,var(--line));background:color-mix(in srgb,var(--primary) 10%,var(--panel));border-radius:13px;margin-bottom:14px}.project-lab-list{display:grid;gap:10px}.project-lab-step{border:1px solid var(--line);border-radius:15px;background:var(--panel);overflow:hidden}.project-lab-step.done{border-color:color-mix(in srgb,var(--primary) 55%,var(--line))}.project-lab-step summary{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:12px;padding:15px;cursor:pointer;background:var(--panel2);list-style:none}.project-lab-step summary::-webkit-details-marker{display:none}.project-lab-step summary small{display:block;color:var(--muted);margin-top:3px}.step-number{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:var(--line);font-weight:900}.project-lab-step.done .step-number{background:var(--primary);color:#04251e}.step-status{font-size:12px;color:var(--muted);border:1px solid var(--line);padding:5px 9px;border-radius:999px}.project-step-body{padding:16px;display:grid;gap:14px}.project-step-body h4{margin:0 0 8px}.project-step-body p{color:var(--muted)}.project-step-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.project-step-grid>section,.project-step-body>section{border:1px solid var(--line);border-radius:13px;padding:14px}.prompt-box{position:relative;background:#07111f;color:#dbeafe;border:1px solid #243955;border-radius:12px;padding:14px}.prompt-box.debug{border-color:#f59e0b66}.prompt-box pre{white-space:pre-wrap;word-break:break-word;margin:0 0 12px;font:13px/1.65 ui-monospace,Consolas,monospace}.file-chips{display:flex;flex-wrap:wrap;gap:7px}.file-chips code{padding:5px 8px;border-radius:8px;background:var(--panel2);border:1px solid var(--line)}.project-step-check{display:flex;align-items:flex-start;gap:10px;padding:13px;border-radius:12px;background:color-mix(in srgb,var(--primary) 9%,var(--panel));border:1px solid color-mix(in srgb,var(--primary) 35%,var(--line));cursor:pointer}.project-step-check input{width:auto;margin-top:4px}.modal:has(.project-lab-list){max-width:1000px;max-height:92dvh;overflow:auto}
@media(max-width:700px){.project-overview{grid-template-columns:1fr 1fr}.project-overview>div:last-child{grid-column:1/-1}.project-step-grid{grid-template-columns:1fr}.project-lab-step summary{grid-template-columns:auto 1fr}.step-status{grid-column:2}.project-card-footer{align-items:stretch;flex-direction:column}.project-card-footer button{width:100%}}