:root{--ak-bg:#f5f8fc;--ak-card:#fff;--ak-ink:#172033;--ak-muted:#6b7a90;--ak-line:#e6edf6;--ak-blue:#2563eb;--ak-blue2:#0ea5e9;--ak-cyan:#22d3ee;--ak-green:#16a34a;--ak-red:#ef4444;--ak-amber:#f59e0b;--ak-shadow:0 12px 40px rgba(25,54,88,.08);--ak-radius:22px}
html{scroll-behavior:smooth}.aklh-site{margin:0;background:var(--ak-bg);color:var(--ak-ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}.aklh-site *{box-sizing:border-box}.aklh-site a{text-decoration:none}.aklh-site button,.aklh-site input,.aklh-site select{font:inherit}.aklh-container{width:min(1420px,calc(100vw - 44px));margin:0 auto}.aklh-card{background:var(--ak-card);border:1px solid var(--ak-line);border-radius:var(--ak-radius);box-shadow:var(--ak-shadow)}
.aklh-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(16px);border-bottom:1px solid var(--ak-line)}.admin-bar .aklh-header{top:32px}.aklh-header-row{min-height:72px;display:flex;align-items:center;gap:22px}.aklh-brand{display:flex;align-items:center;gap:10px;color:var(--ak-ink);white-space:nowrap}.aklh-brand img{width:43px;height:43px;object-fit:contain;border-radius:13px;background:#eef8ff}.aklh-brand span{display:flex;flex-direction:column}.aklh-brand strong{font-size:18px;letter-spacing:-.4px}.aklh-brand small{color:#8090a5;font-size:11px;margin-top:1px}.aklh-nav{display:flex;align-items:center;gap:3px;flex:1}.aklh-nav a{padding:9px 11px;border-radius:11px;color:#475569;font-weight:650;font-size:14px}.aklh-nav a:hover,.aklh-nav a.is-active{background:#eff6ff;color:var(--ak-blue)}.aklh-user-nav{display:flex;align-items:center}.aklh-user-pill{display:flex;align-items:center;gap:8px;padding:5px 8px;border-radius:999px;color:#334155;background:#f8fafc}.aklh-user-pill img{border-radius:50%}.aklh-mobile-menu{display:none;width:40px;height:40px;border:1px solid var(--ak-line);border-radius:12px;background:#fff;color:#334155;cursor:pointer}
.aklh-main{padding-top:28px;padding-bottom:72px;min-height:70vh}.aklh-btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;border:0;border-radius:13px;padding:11px 17px;font-weight:750;transition:.18s;cursor:pointer}.aklh-btn:hover{transform:translateY(-1px)}.aklh-btn-primary{color:#fff!important;background:linear-gradient(135deg,var(--ak-blue),var(--ak-blue2));box-shadow:0 10px 25px rgba(37,99,235,.22)}.aklh-btn-light{color:#334155!important;background:#fff;border:1px solid #dce6f2}.aklh-btn-sm{padding:8px 13px;font-size:13px}.aklh-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}.aklh-pill,.aklh-count{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;background:#eff6ff;color:#2563eb;font-size:12px;font-weight:750}.aklh-pill-green{background:#ecfdf3;color:#15803d}.aklh-pill-muted{background:#f1f5f9;color:#64748b}.aklh-kicker{display:block;color:#2563eb;font-size:12px;font-weight:850;letter-spacing:.12em;margin-bottom:7px}.aklh-phase{display:inline-block;font-size:11px;background:#f1f5f9;color:#64748b;padding:4px 7px;border-radius:999px;margin-left:6px}
.aklh-hero{position:relative;overflow:hidden;padding:48px 54px;min-height:390px;display:grid;grid-template-columns:1.18fr .82fr;align-items:center;gap:36px;background:radial-gradient(circle at 85% 18%,rgba(34,211,238,.22),transparent 27%),radial-gradient(circle at 10% 90%,rgba(37,99,235,.10),transparent 28%),linear-gradient(135deg,#fbfdff,#edf7ff)}.aklh-hero h1{font-size:clamp(39px,5vw,64px);line-height:1.05;margin:18px 0 16px;letter-spacing:-2.2px}.aklh-hero h1 span{background:linear-gradient(90deg,#2563eb,#06b6d4);-webkit-background-clip:text;color:transparent}.aklh-hero p{color:#607089;line-height:1.9;max-width:650px;font-size:16px}.aklh-mascot-zone{min-height:290px;display:grid;place-items:center;position:relative}.aklh-mascot-orb{position:absolute;width:290px;height:290px;border-radius:50%;background:linear-gradient(145deg,#dff8ff,#eaf0ff);box-shadow:inset 0 0 0 18px rgba(255,255,255,.45),0 28px 60px rgba(29,78,216,.14)}.aklh-mascot-zone img{position:relative;width:min(310px,90%);max-height:300px;object-fit:contain;filter:drop-shadow(0 18px 16px rgba(15,46,76,.15))}.aklh-code{position:absolute;background:rgba(255,255,255,.94);border:1px solid #dbeafe;padding:8px 11px;border-radius:11px;font-family:Consolas,monospace;font-size:12px;box-shadow:0 12px 30px rgba(37,99,235,.10);z-index:2}.aklh-code-1{left:3%;top:14%}.aklh-code-2{right:1%;top:26%}.aklh-code-3{right:8%;bottom:7%}
.aklh-section{margin-top:58px}.aklh-section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:19px}.aklh-section-head h2{margin:0;font-size:28px;letter-spacing:-.5px}.aklh-section-head p{margin:6px 0 0;color:var(--ak-muted);line-height:1.7}.aklh-chapter-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.aklh-chapter-card{padding:20px;position:relative;min-height:176px;transition:.2s;color:var(--ak-ink)}.aklh-chapter-card:hover{transform:translateY(-4px);border-color:#bfdbfe;box-shadow:0 18px 38px rgba(37,99,235,.10)}.aklh-chapter-num{width:42px;height:42px;border-radius:13px;display:grid;place-items:center;background:linear-gradient(145deg,#eff6ff,#e0f2fe);color:#2563eb;font-weight:900}.aklh-chapter-card h3{margin:17px 0 6px;font-size:18px;line-height:1.45}.aklh-chapter-card p{margin:0;color:#7b899c;font-size:13px}.aklh-chapter-card b{position:absolute;right:18px;bottom:17px;color:#2563eb;font-size:13px}.aklh-tool-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.aklh-tool-card{padding:22px;color:var(--ak-ink);transition:.2s}.aklh-tool-card:hover{transform:translateY(-3px)}.aklh-tool-icon{font-size:26px}.aklh-tool-card h3{margin:15px 0 7px}.aklh-tool-card p{color:#64748b;line-height:1.7;font-size:14px;min-height:48px}.aklh-tool-card b{color:#2563eb;font-size:13px}.aklh-community{padding:28px 31px;background:#111827;color:#fff;display:flex;align-items:center;justify-content:space-between;gap:20px}.aklh-community h2{color:#fff;margin:4px 0 7px}.aklh-community p{margin:0;color:#b9c5d6}
.aklh-page-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:20px}.aklh-page-head h1{font-size:34px;letter-spacing:-.7px;margin:0}.aklh-page-head p{margin:7px 0 0;color:#66768c;line-height:1.7}.aklh-mode-switch{display:flex;background:#edf2f7;padding:4px;border-radius:999px;gap:3px}.aklh-mode-switch a{padding:7px 12px;border-radius:999px;color:#64748b;font-size:13px;font-weight:700}.aklh-mode-switch a.is-active{background:#fff;color:#2563eb;box-shadow:0 3px 10px rgba(15,23,42,.08)}.aklh-practice-toolbar{display:grid;grid-template-columns:1.25fr repeat(3,minmax(160px,.55fr));gap:10px;padding:15px;margin-bottom:18px}.aklh-practice-toolbar input,.aklh-practice-toolbar select{width:100%;border:1px solid #dbe5f0;border-radius:12px;background:#fff;padding:11px 12px;color:#334155;outline:none}.aklh-practice-toolbar select:disabled{color:#94a3b8;background:#f8fafc}.aklh-search{position:relative}.aklh-search span{position:absolute;left:12px;top:9px;color:#94a3b8;font-size:18px}.aklh-search input{padding-left:34px}.aklh-practice-layout{display:grid;grid-template-columns:310px minmax(0,1fr);gap:18px}.aklh-question-nav{padding:13px;max-height:760px;overflow:auto}.aklh-side-title{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;padding:8px 7px 14px;border-bottom:1px solid var(--ak-line);margin-bottom:8px}.aklh-side-title div{display:flex;flex-direction:column;gap:3px}.aklh-side-title small{color:#94a3b8}.aklh-side-title>span{font-size:11px;background:#eff6ff;color:#2563eb;padding:5px 7px;border-radius:999px}.aklh-question-nav-item{width:100%;display:flex;align-items:flex-start;gap:9px;padding:10px;border:1px solid transparent;border-radius:11px;background:transparent;text-align:left;cursor:pointer;color:#334155}.aklh-question-nav-item:hover,.aklh-question-nav-item.is-active{background:#eff6ff;border-color:#dbeafe}.aklh-question-nav-item>span{width:28px;height:28px;border-radius:9px;display:grid;place-items:center;flex:0 0 28px;background:#f1f5f9;font-size:12px;font-weight:850}.aklh-question-nav-item em{font-style:normal;font-size:12px;line-height:1.5}.aklh-question-nav-item.is-done>span{background:#dcfce7;color:#15803d}.aklh-question-nav-item.is-wrong>span{background:#ffe4e6;color:#be123c}.aklh-question-stage{padding:28px;min-height:590px}.aklh-question-panel{display:none}.aklh-question-panel.is-active{display:block}.aklh-question-top{display:flex;justify-content:space-between;gap:15px;align-items:center;color:#7a8798;font-size:13px}.aklh-question-body{font-size:22px;line-height:1.75;margin:24px 0}.aklh-question-body pre,.aklh-question-body code{font-family:Consolas,Monaco,monospace}.aklh-question-body pre{background:#0f172a;color:#e2e8f0;padding:15px;border-radius:13px;overflow:auto}.aklh-options{display:grid;gap:10px}.aklh-option{position:relative;border:1px solid #dce6f2;border-radius:14px;padding:13px 15px;background:#fff;display:flex;gap:11px;align-items:flex-start;cursor:pointer;transition:.15s}.aklh-option:hover{border-color:#93c5fd;background:#f8fbff}.aklh-option input{position:absolute;opacity:0;pointer-events:none}.aklh-option.is-selected{border-color:#60a5fa;background:#eff6ff}.aklh-option.is-correct{border-color:#86efac;background:#f0fdf4}.aklh-option.is-wrong{border-color:#fda4af;background:#fff1f2}.aklh-option-key{width:27px;height:27px;border-radius:8px;background:#eef2f7;display:grid;place-items:center;flex:0 0 27px;font-weight:850;font-size:12px}.aklh-option-text{line-height:1.6}.aklh-answer-result{margin-top:17px;padding:16px;border-radius:14px;background:#f8fafc;border:1px solid var(--ak-line);line-height:1.75}.aklh-answer-result.is-correct{background:#f0fdf4;border-color:#bbf7d0}.aklh-answer-result.is-wrong{background:#fff7ed;border-color:#fed7aa}.aklh-answer-title{font-weight:850;margin-bottom:5px}.aklh-explanation{margin-top:7px;color:#526174}.aklh-question-actions{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:22px;flex-wrap:wrap}.aklh-future-actions,.aklh-next-actions{display:flex;gap:8px;flex-wrap:wrap}.aklh-btn[disabled]{opacity:.55;cursor:not-allowed;transform:none}.aklh-empty{padding:50px 20px;text-align:center;color:#64748b;border:1px dashed #cbd5e1;border-radius:16px;background:#fbfdff}
.aklh-coming{max-width:820px;margin:45px auto 0;padding:42px;text-align:center}.aklh-coming-icon{width:70px;height:70px;border-radius:22px;margin:0 auto 16px;display:grid;place-items:center;background:linear-gradient(145deg,#eff6ff,#e0f2fe);font-size:30px}.aklh-coming h2,.aklh-coming h1{margin:0 0 10px}.aklh-coming p{color:#64748b;line-height:1.8}.aklh-coming-note{padding:13px 15px;background:#f8fafc;border:1px solid var(--ak-line);border-radius:13px;color:#64748b;font-size:13px;margin:18px auto;max-width:620px}.aklh-login-gate{max-width:980px;margin:30px auto;overflow:hidden;display:grid;grid-template-columns:.9fr 1.1fr}.aklh-gate-art{min-height:390px;background:linear-gradient(145deg,#0f172a,#1d4ed8);display:grid;place-items:center;position:relative;color:#fff;font-size:46px}.aklh-gate-art img{position:absolute;bottom:18px;width:230px;filter:drop-shadow(0 18px 20px rgba(0,0,0,.25))}.aklh-gate-copy{padding:45px;display:flex;flex-direction:column;align-items:flex-start;justify-content:center}.aklh-gate-copy h1{font-size:38px;margin:3px 0 12px}.aklh-gate-copy p{color:#64748b;line-height:1.8}.aklh-login-layout{max-width:1050px;margin:28px auto;display:grid;grid-template-columns:1.1fr .9fr;overflow:hidden}.aklh-login-art{padding:45px;background:linear-gradient(145deg,#0f172a,#1d4ed8);color:#fff;position:relative;min-height:540px}.aklh-login-art h1{font-size:43px;max-width:500px;line-height:1.12}.aklh-login-art p{max-width:560px;line-height:1.8;color:#dbeafe}.aklh-login-art img{position:absolute;right:30px;bottom:10px;width:260px;filter:drop-shadow(0 20px 20px rgba(0,0,0,.22))}.aklh-login-box{padding:40px;background:#fff}.aklh-login-box h2{margin-top:0}.aklh-login-box label{display:block;font-weight:700;font-size:13px;margin-bottom:6px}.aklh-login-box input[type=text],.aklh-login-box input[type=password]{width:100%;border:1px solid #dbe5f0;border-radius:12px;padding:11px 12px;margin-bottom:14px}.aklh-login-box input[type=submit]{border:0;border-radius:13px;padding:11px 18px;background:linear-gradient(135deg,var(--ak-blue),var(--ak-blue2));color:#fff;font-weight:750;cursor:pointer}.aklh-login-note{margin-top:20px;padding:13px 15px;background:#eff6ff;border:1px solid #dbeafe;border-radius:13px;color:#64748b;font-size:13px;line-height:1.7}
.aklh-footer{background:#0f172a;color:#cbd5e1;padding:38px 0}.aklh-footer-grid{display:grid;grid-template-columns:1.4fr .6fr .6fr;gap:30px}.aklh-footer-brand{font-size:20px;color:#fff;font-weight:850}.aklh-footer p{color:#94a3b8}.aklh-footer-links{display:flex;flex-direction:column;gap:9px}.aklh-footer-links a{color:#cbd5e1;font-size:14px}.aklh-toast{position:fixed;right:24px;bottom:24px;z-index:99999;max-width:360px;padding:13px 16px;border-radius:14px;background:#111827;color:#fff;box-shadow:0 20px 50px rgba(0,0,0,.22);opacity:0;transform:translateY(12px);pointer-events:none;transition:.22s}.aklh-toast.is-show{opacity:1;transform:translateY(0)}
@media(max-width:1100px){.aklh-chapter-grid,.aklh-tool-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.aklh-hero{grid-template-columns:1fr}.aklh-mascot-zone{min-height:250px}.aklh-practice-layout{grid-template-columns:260px minmax(0,1fr)}.aklh-practice-toolbar{grid-template-columns:1fr 1fr}}
@media(max-width:900px){.aklh-header-row{position:relative}.aklh-mobile-menu{display:grid;place-items:center;margin-left:auto}.aklh-nav{display:none;position:absolute;left:0;right:0;top:72px;background:#fff;border:1px solid var(--ak-line);border-radius:0 0 16px 16px;padding:10px;box-shadow:0 15px 30px rgba(15,23,42,.10);flex-direction:column;align-items:stretch}.aklh-nav.is-open{display:flex}.aklh-user-nav{margin-left:0}.aklh-brand{flex:1}.aklh-practice-layout{grid-template-columns:1fr}.aklh-question-nav{max-height:250px}.aklh-login-layout,.aklh-login-gate{grid-template-columns:1fr}.aklh-gate-art{min-height:280px}.aklh-practice-toolbar{grid-template-columns:1fr 1fr}.aklh-footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:782px){.admin-bar .aklh-header{top:46px}}
@media(max-width:620px){.aklh-container{width:min(100% - 24px,1420px)}.aklh-main{padding-top:16px}.aklh-header-row{min-height:64px}.aklh-brand strong{font-size:16px}.aklh-brand small{display:none}.aklh-brand img{width:38px;height:38px}.aklh-nav{top:64px}.aklh-user-nav{display:none}.aklh-hero{padding:28px 20px;border-radius:18px}.aklh-hero h1{font-size:37px;letter-spacing:-1px}.aklh-chapter-grid,.aklh-tool-grid,.aklh-practice-toolbar,.aklh-footer-grid{grid-template-columns:1fr}.aklh-section{margin-top:42px}.aklh-section-head,.aklh-page-head,.aklh-community{align-items:flex-start;flex-direction:column}.aklh-question-stage{padding:18px}.aklh-question-body{font-size:18px;margin:20px 0}.aklh-question-actions{align-items:stretch}.aklh-future-actions,.aklh-next-actions{width:100%}.aklh-next-actions{justify-content:flex-end}.aklh-login-art{min-height:360px;padding:28px 22px}.aklh-login-art h1{font-size:34px}.aklh-login-art img{width:190px}.aklh-login-box,.aklh-gate-copy{padding:28px 22px}.aklh-code{display:none}}
/* Phase 4.3 - formal learner account system */
.aklh-user-nav{gap:7px}.aklh-user-pill img{width:34px;height:34px;object-fit:cover}.aklh-logout-link{font-size:12px;color:#64748b;padding:7px 8px;border-radius:9px}.aklh-logout-link:hover{background:#f1f5f9;color:#334155}
.aklh-form-help{color:#6b7a90;font-size:13px;line-height:1.75}.aklh-notice{margin:0 0 18px;padding:12px 15px;border-radius:13px;border:1px solid}.aklh-notice-success{background:#f0fdf4;border-color:#bbf7d0;color:#166534}.aklh-notice-error{background:#fff1f2;border-color:#fecdd3;color:#9f1239}
.aklh-profile-layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:18px;align-items:start}.aklh-profile-card{padding:25px;text-align:center}.aklh-profile-avatar{width:128px;height:128px;border-radius:50%;object-fit:cover;background:#eff6ff;border:6px solid #f8fbff;box-shadow:0 12px 30px rgba(30,64,175,.10)}.aklh-profile-card h2{margin:15px 0 3px}.aklh-profile-card>p{margin:0 0 12px;color:#8291a6}.aklh-profile-meta{margin-top:22px;border-top:1px solid var(--ak-line);padding-top:8px}.aklh-profile-meta>div{display:flex;justify-content:space-between;gap:14px;padding:9px 0;font-size:13px}.aklh-profile-meta span{color:#94a3b8}.aklh-profile-meta strong{font-weight:700;color:#475569}
.aklh-profile-form{padding:28px}.aklh-profile-form h2{margin-top:0}.aklh-profile-form h3{margin-bottom:5px}.aklh-form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px;margin:20px 0}.aklh-form-grid label{display:flex;flex-direction:column;gap:7px;font-size:13px;font-weight:750}.aklh-form-grid input[type=text],.aklh-form-grid input[type=password],.aklh-form-grid input[type=file]{width:100%;border:1px solid #dbe5f0;background:#fff;border-radius:12px;padding:11px 12px;color:#334155}.aklh-form-grid input:disabled{background:#f8fafc;color:#94a3b8}.aklh-form-grid small{font-weight:400;color:#94a3b8}.aklh-form-full{grid-column:1/-1}.aklh-sep{border:0;border-top:1px solid var(--ak-line);margin:24px 0}
.aklh-login-box form{margin-top:18px}.aklh-login-box form label:not(.aklh-remember){display:flex;flex-direction:column;gap:6px;margin:0 0 14px;font-weight:750}.aklh-login-box .aklh-remember{display:flex;align-items:center;gap:7px;margin:2px 0 16px;font-weight:500;color:#64748b}.aklh-login-submit{width:100%}.aklh-login-box code{font-size:12px}
@media(max-width:900px){.aklh-profile-layout{grid-template-columns:1fr}.aklh-profile-card{display:grid;grid-template-columns:auto 1fr;column-gap:18px;text-align:left}.aklh-profile-avatar{grid-row:1/5}.aklh-profile-meta{grid-column:1/-1}}
@media(max-width:620px){.aklh-form-grid{grid-template-columns:1fr}.aklh-form-full{grid-column:1}.aklh-profile-card{display:block;text-align:center}.aklh-profile-avatar{width:112px;height:112px}.aklh-logout-link{display:none}}
/* Phase 4.4 - formal learning history, resume and statistics */
.aklh-learning-hint{margin:0 0 16px;padding:11px 14px;border:1px solid #dbeafe;background:#eff6ff;color:#475569;border-radius:13px;font-size:13px;line-height:1.6}.aklh-learning-hint a{color:var(--ak-blue);font-weight:750}.aklh-learning-hint-green{background:#f0fdf4;border-color:#bbf7d0;color:#166534}
.aklh-stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px}.aklh-stat-card{padding:20px}.aklh-stat-card span{display:block;color:#718096;font-size:13px}.aklh-stat-card strong{display:block;font-size:32px;line-height:1.15;margin:7px 0 3px;color:#172033}.aklh-stat-card small{color:#94a3b8}
.aklh-home-continue{margin-top:14px;padding:18px 20px;display:flex;justify-content:space-between;align-items:center;gap:18px;background:linear-gradient(135deg,#f8fbff,#eff8ff)}.aklh-home-continue>div{display:flex;flex-direction:column;gap:4px}.aklh-home-continue span{font-size:13px;color:#64748b}
.aklh-learning-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:16px}.aklh-learning-card{padding:22px}.aklh-learning-card h2{margin:4px 0 8px}.aklh-learning-card-head{display:flex;justify-content:space-between;gap:18px;align-items:flex-start}.aklh-continue-box{margin-top:16px;padding:18px;border-radius:16px;background:linear-gradient(135deg,#eff6ff,#ecfeff);border:1px solid #dbeafe}.aklh-continue-box b{font-size:17px}.aklh-continue-box p{color:#64748b;line-height:1.7}.aklh-week-chart{height:190px;display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:10px;align-items:end;margin-top:12px}.aklh-week-col{display:grid;grid-template-rows:20px 1fr 20px;gap:6px;text-align:center;height:100%}.aklh-week-count{font-size:11px;color:#64748b}.aklh-week-bar{height:130px;border-radius:10px;background:#eef2f7;display:flex;align-items:flex-end;overflow:hidden}.aklh-week-bar span{display:block;width:100%;min-height:6px;border-radius:10px;background:linear-gradient(180deg,#38bdf8,#2563eb)}.aklh-week-col small{color:#94a3b8;font-size:11px}
.aklh-progress-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.aklh-progress-card{padding:18px;transition:.18s}.aklh-progress-card:hover{transform:translateY(-3px);border-color:#bfdbfe}.aklh-progress-top{display:flex;align-items:center;justify-content:space-between;gap:12px}.aklh-progress-top>b{color:#2563eb}.aklh-progress-card h3{font-size:16px;line-height:1.5;margin:14px 0 12px;color:#172033}.aklh-progress-line{height:7px;background:#eaf0f6;border-radius:999px;overflow:hidden}.aklh-progress-line span{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,#2563eb,#22d3ee)}.aklh-progress-card small{display:block;margin-top:8px;color:#94a3b8}
.aklh-history-table-wrap{overflow:auto}.aklh-history-table{width:100%;border-collapse:collapse;min-width:820px}.aklh-history-table th,.aklh-history-table td{padding:12px 14px;border-bottom:1px solid var(--ak-line);text-align:left;font-size:13px;vertical-align:top}.aklh-history-table th{background:#fbfdff;color:#64748b;font-weight:750}.aklh-pill-red{background:#fff1f2!important;color:#be123c!important}.aklh-pagination{display:flex;gap:6px;flex-wrap:wrap;margin-top:14px}.aklh-pagination a{min-width:35px;height:35px;border:1px solid #dbe5f0;border-radius:9px;background:#fff;display:grid;place-items:center;font-size:13px}.aklh-pagination a.is-active{background:#2563eb;color:#fff;border-color:#2563eb}
.aklh-delete-history{padding:23px;display:grid;grid-template-columns:.8fr 1.2fr;gap:24px;align-items:end}.aklh-delete-history h2{margin:4px 0 6px}.aklh-delete-history p{color:#64748b;line-height:1.7}.aklh-delete-history form{display:grid;grid-template-columns:1fr 1fr 1fr auto;gap:10px;align-items:end}.aklh-delete-history label{display:flex;flex-direction:column;gap:6px;font-size:12px;font-weight:750}.aklh-delete-history input,.aklh-delete-history select{width:100%;border:1px solid #dbe5f0;border-radius:11px;padding:10px 11px;background:#fff}.aklh-btn-danger{background:#fff1f2;color:#be123c;border:1px solid #fecdd3}.aklh-btn-danger:hover{background:#ffe4e6}
@media(max-width:1100px){.aklh-stat-grid,.aklh-progress-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.aklh-learning-grid{grid-template-columns:1fr}.aklh-delete-history{grid-template-columns:1fr}.aklh-delete-history form{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.aklh-stat-grid,.aklh-progress-grid{grid-template-columns:1fr}.aklh-home-continue,.aklh-learning-card-head{align-items:flex-start;flex-direction:column}.aklh-week-chart{gap:5px}.aklh-delete-history form{grid-template-columns:1fr}.aklh-history-table th,.aklh-history-table td{padding:10px}.aklh-learning-card{padding:18px}}
/* Phase 4.4.5 - dynamic question type renderer */
.aklh-free-answer{margin-top:14px;padding:16px;border:1px solid #dce6f2;border-radius:14px;background:#fbfdff}.aklh-free-answer label{display:flex;flex-direction:column;gap:7px;font-size:13px;font-weight:750;color:#475569}.aklh-free-answer input,.aklh-free-answer textarea{width:100%;border:1px solid #cfdbea;border-radius:11px;background:#fff;padding:11px 12px;outline:none;color:#172033}.aklh-free-answer input:focus,.aklh-free-answer textarea:focus{border-color:#60a5fa;box-shadow:0 0 0 4px rgba(37,99,235,.08)}.aklh-free-answer small{display:block;color:#64748b;margin-top:8px;line-height:1.6}.aklh-code-editor{font-family:Consolas,Monaco,monospace;background:#0f172a!important;color:#e2e8f0!important;min-height:220px;line-height:1.65}.aklh-blank-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}.aklh-material-note{padding:18px;border:1px dashed #93c5fd;border-radius:14px;background:#eff6ff;color:#475569;line-height:1.7}.aklh-answer-result.is-manual{background:#eef2ff;border-color:#c7d2fe;color:#3730a3}
@media(max-width:620px){.aklh-blank-grid{grid-template-columns:1fr}}
.aklh-content-blocks{display:grid;gap:14px;margin:18px 0}.aklh-block-text{line-height:1.75;color:#334155}.aklh-block-code small{display:block;color:#64748b;font-size:11px;font-weight:800;margin-bottom:6px}.aklh-block-code pre{margin:0;background:#0f172a;color:#e2e8f0;border-radius:13px;padding:15px;overflow:auto}.aklh-block-code code{font-family:Consolas,Monaco,monospace}.aklh-block-image{margin:0}.aklh-block-image img{display:block;max-width:100%;height:auto;border-radius:14px;border:1px solid var(--ak-line)}.aklh-block-table{overflow:auto}.aklh-block-table table{width:100%;border-collapse:collapse;background:#fff}.aklh-block-table th,.aklh-block-table td{border:1px solid #dbe5f0;padding:9px 10px;text-align:left}.aklh-block-table th{background:#f8fafc}

/* Phase 4.5: wrong-book + favorites */
.aklh-flag-toggle.is-active{border-color:#93c5fd;background:#eff6ff;color:#1d4ed8}.aklh-flag-toggle[data-flag-type="wrongbook"].is-active{border-color:#fbbf24;background:#fffbeb;color:#b45309}.aklh-flag-toggle[disabled]{opacity:.48;cursor:not-allowed}.aklh-collection-head-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.aklh-collection-toolbar{padding:14px;margin-bottom:18px}.aklh-collection-toolbar form{display:grid;grid-template-columns:minmax(240px,1.3fr) minmax(190px,.8fr) minmax(160px,.65fr) auto auto;gap:10px;align-items:center}.aklh-collection-toolbar input,.aklh-collection-toolbar select{width:100%;border:1px solid #dbe5f0;border-radius:12px;background:#fff;padding:11px 12px;color:#334155;outline:none}.aklh-collection-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.aklh-collection-card{padding:20px;display:flex;flex-direction:column;gap:13px}.aklh-collection-card h3{margin:0;font-size:18px;line-height:1.65}.aklh-collection-meta{display:flex;gap:7px;align-items:center;flex-wrap:wrap}.aklh-source-badge{font-size:11px;font-weight:800;letter-spacing:.04em;background:#f1f5f9;color:#64748b;padding:5px 8px;border-radius:999px}.aklh-wrong-snapshot{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:13px;border-radius:14px;background:#fff7ed;border:1px solid #fed7aa}.aklh-wrong-snapshot div{display:flex;flex-direction:column;gap:5px}.aklh-wrong-snapshot span{font-size:12px;color:#9a5a16}.aklh-wrong-snapshot b{font-size:13px;line-height:1.55;color:#7c2d12}.aklh-collection-card-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:auto}.aklh-collection-date{color:#94a3b8}.aklh-collection-empty{margin-top:18px}.aklh-muted{color:#64748b}.aklh-btn-sm{padding:8px 12px;font-size:13px;border-radius:10px}
@media(max-width:900px){.aklh-collection-toolbar form{grid-template-columns:1fr 1fr}.aklh-collection-grid{grid-template-columns:1fr}}
@media(max-width:560px){.aklh-collection-toolbar form{grid-template-columns:1fr}.aklh-wrong-snapshot{grid-template-columns:1fr}}

/* Phase 4.6 - Mock exams */
.aklh-btn-danger{background:#fff1f2!important;color:#be123c!important;border:1px solid #fecdd3!important}
.aklh-pill-red{background:#fff1f2!important;color:#be123c!important}
.aklh-exam-lobby-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(300px,.65fr);gap:18px}
.aklh-exam-builder,.aklh-exam-rules{padding:24px}
.aklh-exam-builder h2,.aklh-exam-rules h2{margin:14px 0 8px}
.aklh-muted{color:#6b7a90}
.aklh-exam-label{display:block;font-weight:800;margin:20px 0 10px}
.aklh-exam-chapters{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}
.aklh-exam-chapters label{display:flex;align-items:center;gap:9px;padding:11px 12px;border:1px solid #e2e8f0;border-radius:12px;background:#fbfdff;cursor:pointer}
.aklh-exam-chapters label small{margin-left:auto;color:#94a3b8}
.aklh-exam-options{margin:16px 0}.aklh-exam-options label span{display:block;font-weight:700;font-size:13px;margin-bottom:6px}
.aklh-exam-options select{width:100%;padding:10px 12px;border:1px solid #dbe5f0;border-radius:11px;background:#fff}
.aklh-exam-safe-note{margin-top:16px;padding:12px 14px;border-radius:12px;background:#f8fafc;color:#64748b;font-size:13px;line-height:1.7}
.aklh-exam-rules ul{padding-left:20px;color:#64748b;line-height:1.9}
.aklh-exam-paper-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.aklh-exam-paper{padding:20px}.aklh-exam-paper h3{margin:13px 0 8px}.aklh-exam-paper p{color:#64748b;min-height:44px}
.aklh-exam-paper-meta{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}.aklh-exam-paper-meta span{padding:5px 9px;border-radius:999px;background:#f1f5f9;color:#475569;font-size:12px;font-weight:750}
.aklh-exam-history{overflow:auto}.aklh-exam-history table{width:100%;border-collapse:collapse;min-width:760px}.aklh-exam-history th,.aklh-exam-history td{padding:13px 15px;border-bottom:1px solid #edf2f7;text-align:left}.aklh-exam-history th{color:#64748b;font-size:13px;background:#fbfdff}
.aklh-exam-head{align-items:center}.aklh-exam-timer-wrap{text-align:right;min-width:150px}.aklh-exam-timer-wrap span{display:block;color:#64748b;font-size:12px}.aklh-exam-timer-wrap strong{font-size:30px;font-variant-numeric:tabular-nums;letter-spacing:1px}.aklh-exam-timer-wrap strong.is-urgent{color:#dc2626}
.aklh-exam-progressbar{height:7px;border-radius:999px;background:#e7edf5;overflow:hidden;margin:-8px 0 18px}.aklh-exam-progressbar span{display:block;height:100%;width:0;background:linear-gradient(90deg,#2563eb,#22d3ee);transition:width .2s}
.aklh-exam-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:18px;align-items:start}
.aklh-exam-stage{padding:28px;min-height:520px}.aklh-exam-question{display:none}.aklh-exam-question.is-active{display:block}.aklh-exam-save-state{min-height:20px;text-align:right;color:#94a3b8;font-size:12px;margin-top:8px}
.aklh-exam-answer-sheet{padding:18px;position:sticky;top:110px}.aklh-exam-number-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;margin:16px 0}.aklh-exam-number{height:38px;border-radius:9px;border:1px solid #dbe5f0;background:#fff;color:#475569;font-weight:750}.aklh-exam-number.is-answered{background:#eff6ff;border-color:#93c5fd;color:#2563eb}.aklh-exam-number.is-active{box-shadow:0 0 0 2px #2563eb inset}
.aklh-exam-sheet-legend{display:flex;gap:14px;color:#64748b;font-size:12px;margin-bottom:16px}.aklh-exam-sheet-legend span{display:flex;align-items:center;gap:5px}.aklh-exam-sheet-legend i{width:12px;height:12px;border-radius:4px;border:1px solid #cbd5e1;background:#fff}.aklh-exam-sheet-legend i.answered{background:#dbeafe;border-color:#93c5fd}.aklh-exam-answer-sheet>small{display:block;text-align:center;color:#94a3b8;margin-top:8px}
.aklh-exam-result-stats{margin-bottom:18px}.aklh-exam-result-list{display:grid;gap:14px}.aklh-exam-result-item{padding:22px}.aklh-exam-result-item.is-correct{border-left:4px solid #22c55e}.aklh-exam-result-item.is-wrong{border-left:4px solid #ef4444}
.aklh-exam-answer-compare{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:16px 0}.aklh-exam-answer-compare>div{padding:13px;border-radius:12px;background:#f8fafc}.aklh-exam-answer-compare span{display:block;font-size:12px;color:#64748b;margin-bottom:6px}.aklh-exam-answer-compare b{line-height:1.6}

@media(max-width:1050px){.aklh-exam-lobby-grid,.aklh-exam-layout{grid-template-columns:1fr}.aklh-exam-answer-sheet{position:static}.aklh-exam-paper-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:700px){.aklh-exam-chapters,.aklh-exam-paper-grid,.aklh-exam-answer-compare{grid-template-columns:1fr}.aklh-exam-stage{padding:18px}.aklh-exam-number-grid{grid-template-columns:repeat(5,1fr)}.aklh-exam-head{align-items:flex-start}.aklh-exam-timer-wrap{text-align:left}.aklh-exam-timer-wrap strong{font-size:26px}}

/* Phase 4.7 - learner submissions + review */
.aklh-pill-amber{background:#fff7ed;color:#b45309}.aklh-pill-gray{background:#f1f5f9;color:#64748b}.aklh-pill-contributor{background:#f5f3ff;color:#6d28d9;margin-left:6px}
.aklh-submission-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:18px;align-items:start}.aklh-submission-form{padding:24px}.aklh-submission-form-head{display:flex;justify-content:space-between;gap:15px;align-items:flex-start;margin-bottom:20px}.aklh-submission-form-head h2{margin:0 0 6px}.aklh-submission-form-head p{margin:0;color:#64748b}.aklh-submission-side{padding:20px;position:sticky;top:110px}.aklh-submission-side h3{margin-top:0}.aklh-submission-side ul{padding-left:18px;color:#64748b;line-height:1.85;font-size:13px}.aklh-form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.aklh-form-grid label{display:flex;flex-direction:column;gap:6px;font-size:13px;font-weight:750;color:#475569}.aklh-form-grid .aklh-full{grid-column:1/-1}.aklh-form-grid input[type=text],.aklh-form-grid input[type=file],.aklh-form-grid textarea,.aklh-form-grid select{width:100%;border:1px solid #dbe5f0;border-radius:11px;background:#fff;padding:10px 12px;color:#172033}.aklh-form-grid textarea{resize:vertical;line-height:1.65}.aklh-submission-answer-card{margin:18px 0;padding:18px;border:1px solid #e2e8f0;border-radius:16px;background:#fbfdff}.aklh-submission-answer-card h3{margin:0 0 13px}.aklh-submission-option-row{display:grid;grid-template-columns:34px 1fr 90px 90px;gap:8px;align-items:center;margin-top:8px}.aklh-submission-option-row>span{width:30px;height:30px;border-radius:8px;background:#eff6ff;color:#2563eb;display:grid;place-items:center;font-weight:850}.aklh-submission-option-row input[type=text]{width:100%;border:1px solid #dbe5f0;border-radius:10px;padding:9px 10px}.aklh-submission-option-row label{font-size:12px;color:#475569}.aklh-submission-extra{margin-top:18px}.aklh-submission-thumb{display:block;max-width:180px;max-height:150px;object-fit:contain;border-radius:12px;border:1px solid #e2e8f0;margin-top:9px}.aklh-duplicate-warning{padding:13px 14px;border:1px solid #fed7aa;border-radius:13px;background:#fff7ed;color:#9a3412;margin-top:16px}.aklh-duplicate-warning p{margin:5px 0 0}.aklh-submission-list{display:grid;gap:12px}.aklh-submission-item{padding:18px;display:flex;justify-content:space-between;gap:18px;align-items:center}.aklh-submission-item-main{min-width:0}.aklh-submission-item-top{display:flex;gap:7px;flex-wrap:wrap}.aklh-submission-item h3{margin:10px 0 6px;line-height:1.55}.aklh-submission-item p{margin:0;color:#64748b;font-size:13px}.aklh-submission-item .aklh-actions{margin-top:0;align-items:center}.aklh-learning-hint-red{background:#fff1f2!important;border-color:#fecdd3!important;color:#be123c!important}
@media(max-width:980px){.aklh-submission-layout{grid-template-columns:1fr}.aklh-submission-side{position:static}.aklh-submission-option-row{grid-template-columns:34px 1fr 80px 80px}}
@media(max-width:620px){.aklh-form-grid{grid-template-columns:1fr}.aklh-form-grid .aklh-full{grid-column:1}.aklh-submission-option-row{grid-template-columns:34px 1fr}.aklh-submission-option-row label{grid-column:2}.aklh-submission-item{align-items:flex-start;flex-direction:column}}
.aklh-question-image{margin:14px 0 18px}.aklh-question-image img,.aklh-explanation-image img{display:block;max-width:100%;height:auto;border-radius:14px;border:1px solid var(--ak-line)}.aklh-explanation-image{margin-top:10px}


/* Phase 4.8 - public message board */
.aklh-message-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:18px;align-items:start}.aklh-message-main{min-width:0}.aklh-message-side{display:grid;gap:14px;position:sticky;top:110px}.aklh-message-rules{padding:20px}.aklh-message-rules h3{margin:0 0 10px}.aklh-message-rules p{color:#64748b;line-height:1.75;margin:0}.aklh-message-rules ul{margin:0;padding-left:20px;color:#64748b;line-height:1.9;font-size:13px}
.aklh-message-composer{padding:20px;margin-bottom:14px}.aklh-message-composer-head{display:flex;justify-content:space-between;gap:14px;align-items:flex-start;margin-bottom:10px}.aklh-message-composer-head>div{display:flex;flex-direction:column;gap:3px}.aklh-message-composer-head small,.aklh-message-composer-head>span{color:#94a3b8;font-size:12px}.aklh-message-composer textarea{width:100%;border:1px solid #dbe5f0;border-radius:14px;padding:13px 14px;resize:vertical;min-height:105px;line-height:1.7;outline:none}.aklh-message-composer textarea:focus{border-color:#93c5fd;box-shadow:0 0 0 4px rgba(37,99,235,.08)}.aklh-message-composer-actions{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:10px}.aklh-message-file{display:inline-flex;align-items:center;gap:6px;color:#475569;font-size:13px;font-weight:700;cursor:pointer}.aklh-message-file input{max-width:230px;font-size:12px}.aklh-message-guest{padding:18px 20px;margin-bottom:14px;display:flex;align-items:center;justify-content:space-between;gap:16px}.aklh-message-guest strong{font-size:16px}.aklh-message-guest p{margin:5px 0 0;color:#64748b;font-size:13px}
.aklh-message-list{display:grid;gap:12px}.aklh-message-thread{padding:20px}.aklh-message-item{min-width:0}.aklh-message-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.aklh-message-author{display:flex;align-items:center;gap:10px;min-width:0}.aklh-message-author img{width:38px;height:38px;border-radius:50%;object-fit:cover;background:#eef6ff;border:1px solid #dce8f5}.aklh-message-author>div{display:flex;flex-direction:column;gap:2px;min-width:0}.aklh-message-author strong{font-size:14px}.aklh-message-author small{color:#94a3b8;font-size:11px}.aklh-message-owner-actions{display:flex;gap:7px}.aklh-message-owner-actions button,.aklh-message-actions button{border:0;background:transparent;padding:4px 5px;color:#64748b;font-size:12px}.aklh-message-owner-actions button:hover,.aklh-message-actions button:hover{color:#2563eb}.aklh-message-delete:hover{color:#be123c!important}.aklh-message-content{margin:10px 0 5px;line-height:1.8;color:#334155;word-break:break-word}.aklh-message-content.is-deleted{color:#94a3b8;font-style:italic}.aklh-message-image{margin:10px 0}.aklh-message-image img{display:block;max-width:min(420px,100%);max-height:320px;object-fit:contain;border-radius:14px;border:1px solid #e2e8f0;background:#f8fafc}.aklh-message-actions{margin-top:5px}.aklh-message-replies{margin-top:12px;padding-left:22px;border-left:2px solid #eef2f7}.aklh-message-item.is-reply{padding:10px 0}.aklh-message-item.is-reply+.aklh-message-item.is-reply{border-top:1px dashed #e6edf5}.aklh-message-depth-3 .aklh-message-replies{padding-left:0;border-left:0}.aklh-message-sentinel{text-align:center;padding:18px;color:#94a3b8;font-size:13px}.aklh-message-sentinel[hidden]{display:none}.aklh-message-empty{margin-top:14px;padding:34px;text-align:center}.aklh-message-empty h3{margin-top:0}.aklh-message-empty p{color:#64748b;margin-bottom:0}
@media(max-width:980px){.aklh-message-layout{grid-template-columns:1fr}.aklh-message-side{position:static;grid-template-columns:1fr 1fr}}
@media(max-width:640px){.aklh-message-side{grid-template-columns:1fr}.aklh-message-guest,.aklh-message-composer-actions{align-items:flex-start;flex-direction:column}.aklh-message-file{flex-direction:column;align-items:flex-start}.aklh-message-replies{padding-left:14px}.aklh-message-thread{padding:16px}.aklh-message-head{gap:8px}.aklh-message-owner-actions{flex-direction:column;gap:1px}}

.aklh-inline-reply-form{margin:10px 0 4px;padding:12px;border-radius:13px;background:#f8fafc;border:1px solid #e2e8f0}.aklh-inline-reply-form textarea{width:100%;border:1px solid #dbe5f0;border-radius:10px;padding:10px;resize:vertical;line-height:1.6}.aklh-inline-reply-actions{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:8px}.aklh-inline-reply-actions label{font-size:12px;color:#64748b;display:flex;gap:6px;align-items:center}.aklh-inline-reply-actions input{max-width:210px;font-size:11px}@media(max-width:620px){.aklh-inline-reply-actions{align-items:flex-start;flex-direction:column}}
/* Phase 4.10 realtime state */
.aklh-realtime-state{font-weight:700}.aklh-realtime-state[data-state="online"]{color:#15803d}.aklh-realtime-state[data-state="connecting"]{color:#b45309}.aklh-realtime-state[data-state="offline"],.aklh-realtime-state[data-state="error"]{color:#b91c1c}.aklh-realtime-state[data-state="off"]{color:#64748b}.aklh-realtime-card small{display:block;margin-top:8px;color:#64748b;line-height:1.65}