:root{--bg:#06101f;--panel:#0d1d33;--panel2:#112641;--ink:#edf6ff;--muted:#9db0c8;--line:#24405f;--teal:#2dd4bf;--amber:#f59e0b;--red:#fb7185;--green:#34d399;--shadow:0 24px 70px rgba(0,0,0,.28)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;min-height:100vh;background:radial-gradient(circle at 75% -10%,#123d59 0,transparent 38%),var(--bg);color:var(--ink);font-family:"Noto Sans Thai",Tahoma,"Segoe UI",Arial,sans-serif;line-height:1.72;font-weight:400}
.ambient{position:fixed;z-index:-1;border-radius:999px;filter:blur(90px);opacity:.15}
.ambient-a{width:320px;height:320px;background:var(--teal);left:-130px;top:35%}
.ambient-b{width:280px;height:280px;background:var(--amber);right:-100px;bottom:-80px}
.site-header{max-width:1180px;margin:auto;padding:20px 24px;display:flex;justify-content:space-between;align-items:center}
.brand{display:flex;gap:12px;align-items:center;color:var(--ink);text-decoration:none}
.brand-mark{width:43px;height:43px;border:1px solid #3f617f;border-radius:13px;display:grid;place-items:center;font-weight:900;background:linear-gradient(145deg,#17324e,#091629);color:var(--teal)}
.brand strong,.brand small{display:block}.brand strong{font-weight:700}
.brand small{color:var(--muted);font-size:.75rem;letter-spacing:.08em}
.site-header nav{display:flex;gap:8px}
.nav-logout{color:var(--muted);background:transparent;border:1px solid var(--line);padding:9px 14px;border-radius:10px;font:inherit;cursor:pointer}.nav-logout:hover{color:var(--ink);border-color:#467094}.auth-locked .site-header nav{display:none}
.site-header nav a{color:var(--muted);text-decoration:none;padding:9px 14px;border-radius:10px}
.site-header nav a:hover{color:var(--ink);background:#ffffff0a}
main{max-width:1180px;margin:auto;padding:36px 24px 84px;min-height:calc(100vh - 150px)}
main:focus{outline:none}
.eyebrow{color:var(--teal);font-size:.8rem;font-weight:800;letter-spacing:.16em;text-transform:uppercase}
.hero{padding:50px 0 42px;display:grid;grid-template-columns:1.25fr .75fr;gap:48px;align-items:end}
.hero h1{font-size:clamp(2.5rem,6vw,5.7rem);line-height:1.18;letter-spacing:-.015em;margin:10px 0 18px;max-width:820px;font-weight:800}
.hero h1 em{color:var(--teal);font-style:normal}
.hero p{font-size:1.08rem;color:var(--muted);max-width:620px}
.hero-stat{border-left:1px solid var(--line);padding-left:28px}
.hero-stat strong{font-size:3.7rem;line-height:1;display:block;color:var(--amber)}
.hero-stat span{color:var(--muted)}
.catalog-head{padding:38px 0 30px;display:flex;align-items:end;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line);margin-bottom:30px}.catalog-head h1{margin:5px 0;font-size:clamp(2rem,5vw,4rem);line-height:1.3}.catalog-head p{margin:0;color:var(--muted);font-size:1.05rem}.catalog-count{flex:0 0 auto;min-width:105px;text-align:center;padding:15px;border:1px solid var(--line);border-radius:18px;color:var(--teal);font-size:2.3rem;font-weight:900;line-height:1}.catalog-count small{color:var(--muted);font-size:.78rem;font-weight:600}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin:28px 0 18px}
.section-head h2,.course-hero h1{margin:0;font-size:clamp(1.8rem,4vw,3.2rem);letter-spacing:0;line-height:1.4;font-weight:700}
.section-head p,.course-hero p{margin:6px 0 0;color:var(--muted)}
.course-card{display:grid;grid-template-columns:auto 1fr auto;gap:22px;align-items:center;background:linear-gradient(145deg,#112641,#0a192c);border:1px solid var(--line);border-radius:22px;padding:24px;box-shadow:var(--shadow);text-decoration:none;color:var(--ink);transition:.25s}
.course-list{display:grid;gap:16px}
.course-card:hover{transform:translateY(-3px);border-color:#3c6c8c}
.course-code{background:var(--teal);color:#04231f;font-weight:900;border-radius:14px;padding:20px 16px;letter-spacing:.06em}
.course-code-alt{background:var(--amber);color:#241500}
.assessment-card{border-color:#6f5626;background:linear-gradient(145deg,#2b2315,#121a29)}
.assessment-card:hover{border-color:#c58b24}
.assessment-code{background:#f97316;color:#2b1004}
.usage-panel{margin-top:56px}.usage-status{display:inline-flex;align-items:center;gap:8px;color:var(--muted)}.usage-status:before{content:"";width:9px;height:9px;border-radius:50%;background:#64748b}.usage-status.online:before{background:var(--green);box-shadow:0 0 0 5px #34d39918}.usage-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.usage-stats article{min-height:116px;padding:20px;border:1px solid var(--line);border-radius:18px;background:linear-gradient(145deg,#10243d,#09182a);display:flex;flex-direction:column;justify-content:space-between}.usage-stats strong{font-size:clamp(1.45rem,3vw,2.1rem);color:var(--teal);overflow-wrap:anywhere}.usage-stats span{color:var(--muted);font-size:.88rem}.history-card{margin-top:16px;padding:22px;border:1px solid var(--line);border-radius:18px;background:#0a192b}.history-card h3{margin:0 0 12px}.history-card ol{list-style:none;margin:0 0 12px;padding:0}.history-card li{display:flex;justify-content:space-between;gap:16px;padding:11px 0;border-bottom:1px solid #1b3550;color:var(--muted)}.history-card small{color:#70869f}.visitor-info{display:flex;flex-direction:column}.visitor-info b{color:var(--ink);font-weight:700}.visitor-info small{color:#7dd3fc}.visit-time{white-space:nowrap}.usage-empty{justify-content:center!important}
.course-card h3{margin:0;font-size:1.28rem;font-weight:700}
.course-card p{margin:3px 0;color:var(--muted)}
.meta{display:flex;gap:8px;flex-wrap:wrap}
.chip{font-size:.78rem;color:#c8d7e8;border:1px solid var(--line);border-radius:999px;padding:4px 9px}
.arrow{font-size:1.8rem;color:var(--amber)}
.course-hero{padding:26px 0 30px}
.course-section{margin-top:34px}.topic-grid,.resource-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.topic-grid article,.resource-card{padding:22px;border:1px solid var(--line);border-radius:18px;background:linear-gradient(145deg,#10243d,#09182a)}.topic-grid article>span{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:10px;background:#14394a;color:var(--teal);font-weight:900}.topic-grid h3,.resource-card h3{margin:16px 0 7px;font-size:1.08rem}.topic-grid p,.resource-card p{margin:0;color:var(--muted)}.resource-card{display:flex;flex-direction:column;min-height:210px;color:var(--ink);text-decoration:none;transition:.22s}.resource-card:hover{transform:translateY(-3px);border-color:#3c6c8c}.resource-card b{margin-top:auto;padding-top:18px;color:var(--teal)}.resource-type{align-self:flex-start;border:1px solid #35647a;border-radius:999px;padding:3px 9px;color:#7dd3fc;font-size:.78rem;font-weight:700}.resource-grid-two{grid-template-columns:repeat(2,1fr);max-width:860px}
.midterm-feature{margin:8px 0 38px;padding:26px;display:flex;align-items:center;justify-content:space-between;gap:22px;color:var(--ink);text-decoration:none;border:1px solid #725823;border-radius:22px;background:linear-gradient(135deg,#2b2413,#102238);box-shadow:var(--shadow);transition:.22s}.midterm-feature:hover{transform:translateY(-3px);border-color:var(--amber)}.midterm-feature h2{margin:14px 0 4px;font-size:clamp(1.35rem,3vw,2rem)}.midterm-feature p{margin:0;color:var(--muted)}
.midterm-hero{padding-bottom:22px}.source-note{margin-top:18px;padding:13px 16px;border-left:4px solid var(--amber);border-radius:8px;background:#2b2110;color:#f6d692;font-size:.9rem}.study-tabs{position:sticky;top:0;z-index:5;display:flex;gap:8px;padding:12px 0;background:linear-gradient(180deg,var(--bg) 82%,transparent)}.study-tabs button,.study-toc button{border:1px solid var(--line);border-radius:10px;background:#0a192b;color:var(--muted);font:inherit;cursor:pointer}.study-tabs button{padding:10px 14px;font-weight:700}.study-tabs button.active{background:var(--teal);border-color:var(--teal);color:#03231f}.study-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:24px;align-items:start;margin-top:12px}.study-toc{position:sticky;top:72px;max-height:calc(100vh - 95px);overflow:auto;padding:17px;border:1px solid var(--line);border-radius:16px;background:#09182a}.study-toc strong{display:block;margin-bottom:10px}.study-toc button{display:block;width:100%;padding:8px 10px;margin:5px 0;text-align:left;font-size:.82rem}.study-toc button:hover{color:var(--ink);border-color:#467094}.study-document{min-width:0;padding:clamp(20px,4vw,40px);border:1px solid var(--line);border-radius:22px;background:linear-gradient(145deg,#0e2037,#081526);box-shadow:var(--shadow)}.study-document h1{margin:48px 0 12px;padding-top:8px;border-top:1px solid var(--line);font-size:clamp(1.55rem,3.2vw,2.35rem);line-height:1.35;scroll-margin-top:70px}.study-document h1:first-child{margin-top:0;border-top:0}.study-document h2{margin:30px 0 10px;font-size:1.35rem;color:#d9eaff}.study-document h3{margin:24px 0 7px;font-size:1.05rem;color:var(--teal)}.study-document p{margin:8px 0;color:#c4d4e5}.study-document ul,.study-document ol{margin:8px 0 18px;padding-left:25px;color:#c4d4e5}.study-document li{margin:6px 0}.study-document blockquote{margin:12px 0;padding:14px 17px;border-left:4px solid #3b82f6;border-radius:8px;background:#071423;color:#c8d9eb}.study-document code{padding:2px 6px;border-radius:6px;background:#06101f;color:#fbbf24;font-family:Consolas,monospace}.study-document hr{margin:34px 0;border:0;border-top:1px solid var(--line)}
.detail-link{display:inline-flex;margin:0 0 12px;padding:8px 13px;border:1px solid #3b7185;border-radius:10px;color:var(--teal);font-weight:800;text-decoration:none}.detail-link:hover{background:#123044;border-color:var(--teal)}
.lesson-hero{padding-bottom:20px}.lesson-layout{margin-top:0}.lesson-nav a{display:block;margin:5px 0;padding:8px 10px;border:1px solid var(--line);border-radius:10px;color:var(--muted);font-size:.8rem;text-decoration:none}.lesson-nav a:hover,.lesson-nav a.active{color:var(--ink);border-color:#467094;background:#102b43}.lesson-document>h1:first-child{color:var(--teal)}.study-document a{color:#7dd3fc}.study-document a:hover{text-decoration:none}
.back{color:var(--teal);text-decoration:none;display:inline-block;margin-bottom:20px}
.mode-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.mode-card{display:flex;flex-direction:column;min-height:250px;padding:25px;border-radius:22px;background:var(--panel);border:1px solid var(--line)}
.mode-number{color:var(--amber);font-weight:900;font-size:.85rem}
.mode-card h2{margin:22px 0 8px;font-size:1.55rem;font-weight:700}
.mode-card p{color:var(--muted);margin:0 0 24px}
.mode-card .btn{margin-top:auto;align-self:flex-start}
.btn{border:0;border-radius:12px;padding:12px 18px;background:var(--teal);color:#03231f;font:inherit;font-weight:800;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px}
.btn:hover{filter:brightness(1.08)}
.btn.secondary{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn.amber{background:var(--amber);color:#241500}
.quiz-shell{max-width:840px;margin:auto}
.quiz-top{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px}
.quiz-controls{display:flex;gap:8px;align-items:center}
.translate-btn{border-color:#3b7185;color:var(--teal)}
.progress-track{height:7px;background:#172d46;border-radius:99px;overflow:hidden}
.progress-fill{height:100%;background:linear-gradient(90deg,var(--teal),#60a5fa);transition:width .3s}
.question-card{background:linear-gradient(145deg,var(--panel),#0a192b);border:1px solid var(--line);border-radius:24px;padding:clamp(20px,5vw,38px);box-shadow:var(--shadow);margin-top:18px}
.question-label{display:flex;justify-content:space-between;color:var(--muted);font-size:.86rem}
.question-card h1{font-size:clamp(1.3rem,3vw,1.8rem);line-height:1.45;margin:18px 0 24px}
.options{display:grid;gap:12px}
.option{display:grid;grid-template-columns:34px 1fr;gap:12px;align-items:start;text-align:left;width:100%;padding:15px;border-radius:14px;background:#071526;border:1px solid #213d5a;color:var(--ink);font:inherit;cursor:pointer}
.option:hover{border-color:#467094}
.option.selected{border-color:var(--teal);background:#0d2b35}
.option.correct{border-color:var(--green);background:#0b302c}
.option.wrong{border-color:var(--red);background:#351728}
.option-key{width:28px;height:28px;border-radius:8px;background:#18304c;display:grid;place-items:center;font-weight:800}
.actions{display:flex;justify-content:space-between;gap:12px;margin-top:22px}
.feedback{margin-top:18px;padding:16px 18px;border-radius:14px;border-left:4px solid var(--green);background:#0a2828}
.feedback.bad{border-color:var(--red);background:#2b1520}
.feedback strong{display:block;margin-bottom:3px}
.feedback p{margin:0;color:#c5d6e6}
.reference-link{display:inline-flex;margin-top:10px;color:#7dd3fc;font-weight:700;text-decoration:none}.reference-link:hover{text-decoration:underline}
.setup-card{max-width:650px;margin:30px auto;background:var(--panel);border:1px solid var(--line);border-radius:24px;padding:32px;box-shadow:var(--shadow)}
.setup-card h1{margin-top:0}
.range-row{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center;margin:28px 0}
.range-row input{width:100%;accent-color:var(--teal)}
.count-badge{min-width:62px;text-align:center;font-weight:900;font-size:1.35rem;color:var(--amber)}
.exam-nav{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}
.exam-dot{width:38px;height:38px;border:1px solid var(--line);border-radius:10px;background:#0b1a2c;color:var(--muted);cursor:pointer}
.exam-dot.done{background:#154052;color:var(--ink);border-color:#2e7283}
.exam-dot.active{outline:2px solid var(--amber)}
.result{text-align:center}
.score-ring{width:170px;height:170px;border-radius:50%;margin:22px auto;display:grid;place-items:center;background:conic-gradient(var(--teal) var(--score),#1a334d 0);position:relative}
.score-ring:after{content:"";position:absolute;inset:13px;background:var(--panel);border-radius:50%}
.score-ring strong{z-index:1;font-size:2.6rem}
.review{margin-top:30px;text-align:left}
.review-item{padding:18px;border-top:1px solid var(--line)}
.review-item h3{font-size:1rem;margin:0 0 8px}
.review-item p{margin:3px 0;color:var(--muted)}
.review-item .ok{color:var(--green)}
.review-item .no{color:var(--red)}
.review-title{display:flex;align-items:flex-start;gap:9px}.set-badge{flex:0 0 auto;border:1px solid #3c6c8c;border-radius:999px;padding:2px 8px;color:#7dd3fc;font-size:.72rem;white-space:nowrap}
footer{max-width:1180px;margin:auto;padding:20px 24px 30px;border-top:1px solid #142a43;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:18px;color:#71869f;font-size:.85rem}footer>span:last-child{text-align:right}.ai-credit{color:#9db0c8}.ai-credit strong{color:var(--teal);font-weight:700}
.empty{padding:60px 20px;text-align:center;color:var(--muted)}
.access-wrap{min-height:calc(100vh - 220px);display:grid;place-items:center;padding:20px 0}.access-card{width:min(680px,100%);padding:clamp(24px,5vw,42px);background:linear-gradient(145deg,#112641,#081629);border:1px solid var(--line);border-radius:26px;box-shadow:var(--shadow)}.access-icon{width:58px;height:58px;margin-bottom:22px;display:grid;place-items:center;border-radius:16px;background:var(--teal);color:#052723;font-weight:900}.access-card h1{font-size:clamp(1.8rem,5vw,2.7rem);line-height:1.3;margin:8px 0}.access-card>p{color:var(--muted)}.terms-box{margin:24px 0;padding:18px 20px;border:1px solid var(--line);border-radius:16px;background:#071525}.terms-box h2{font-size:1.05rem;margin:0 0 8px}.terms-box ul{margin:0;padding-left:22px;color:#bfd0e2}.terms-box li{margin:5px 0}.accept-row{display:flex;gap:10px;align-items:flex-start;margin-bottom:18px;cursor:pointer}.accept-row input{margin-top:6px;accent-color:var(--teal)}#access-form>label[for="access-password"]{display:block;font-weight:600;margin-bottom:7px}.password-row{display:grid;grid-template-columns:1fr auto;gap:10px}.password-row input{min-width:0;border:1px solid var(--line);border-radius:12px;background:#061322;color:var(--ink);padding:12px 14px;font:inherit;outline:none}.password-row input:focus{border-color:var(--teal);box-shadow:0 0 0 3px #2dd4bf18}.access-error{min-height:1.5em!important;margin:10px 0 0!important;color:var(--red)!important;font-size:.9rem}
.history-columns{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.history-columns .history-card{margin-top:16px}.blocked-history{border-color:#583043}.blocked-history h3{color:#fda4af}.privacy-note{display:block;margin-top:12px;color:#70869f}.blocked-card{border-color:#713448}.blocked-icon{background:var(--red);color:#2b0710}
.usage-page{margin-top:0}
.learning-overview{margin:18px 0 34px;padding:26px;border:1px solid #31536f;border-radius:22px;background:linear-gradient(135deg,#102d43,#0b1b2e)}.learning-intro{display:grid;grid-template-columns:1fr 220px;gap:30px;align-items:center}.learning-intro h2{margin:5px 0;font-size:clamp(1.6rem,4vw,2.5rem)}.learning-intro p{margin:0;color:var(--muted)}.learning-progress{padding:18px;border-radius:16px;background:#071525;text-align:center}.learning-progress strong{display:block;color:var(--teal);font-size:2.4rem;line-height:1.2}.learning-progress span{display:block;color:var(--muted);font-size:.85rem;margin-bottom:12px}.learning-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}.learning-track{margin:32px 0}.track-heading{display:grid;grid-template-columns:46px 1fr;gap:14px;align-items:center;margin-bottom:14px}.track-heading>span{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;background:#153b4b;color:var(--teal);font-weight:900}.track-heading h3{margin:0;font-size:1.25rem}.track-heading p{margin:1px 0;color:var(--muted)}.lesson-card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.lesson-card{display:grid;grid-template-columns:42px 1fr auto;gap:13px;align-items:center;padding:18px;border:1px solid var(--line);border-radius:16px;background:#0a192b;color:var(--ink);text-decoration:none;transition:.2s}.lesson-card:hover{border-color:#4b7897;transform:translateY(-2px)}.lesson-card.completed{border-color:#286a61;background:#0b272b}.lesson-number{width:38px;height:38px;display:grid;place-items:center;border-radius:11px;background:#14394a;color:var(--teal);font-weight:900}.lesson-card.completed .lesson-number{background:var(--teal);color:#04231f}.lesson-card h4{margin:0;font-size:1rem}.lesson-card p{margin:2px 0;color:var(--muted);font-size:.82rem}.lesson-progress-row{display:grid;grid-template-columns:auto minmax(160px,420px);gap:16px;align-items:center;color:var(--muted);font-size:.88rem}.focused-lesson{max-width:850px;margin:0 auto}.focused-lesson>h1:first-child{display:none}.lesson-footer{max-width:850px;margin:22px auto 0;display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:center}.lesson-footer>div:last-child{text-align:right}
@media(max-width:760px){.site-header{align-items:flex-start}
.site-header{align-items:center;flex-wrap:wrap}.site-header nav{display:flex;width:100%;margin-top:12px;overflow-x:auto;padding-bottom:3px}.site-header nav a,.nav-logout{white-space:nowrap}.auth-locked .site-header nav{display:none}
.catalog-head{align-items:flex-start}.catalog-count{min-width:82px}.topic-grid,.resource-grid,.resource-grid-two{grid-template-columns:1fr}
.study-tabs{overflow-x:auto}.study-tabs button{white-space:nowrap}.study-layout{grid-template-columns:1fr}.study-toc{position:static;max-height:260px}.midterm-feature{align-items:flex-start}
.hero{grid-template-columns:1fr;gap:20px;padding-top:25px}
.hero-stat{border-left:0;border-top:1px solid var(--line);padding:20px 0 0}
.course-card{grid-template-columns:1fr}
.course-code{justify-self:start}
.usage-stats{grid-template-columns:repeat(2,1fr)}
.history-card li{align-items:flex-start;flex-direction:column;gap:2px}
.history-columns{grid-template-columns:1fr}
.password-row{grid-template-columns:1fr}.password-row .btn{width:100%}
.arrow{display:none}
.mode-grid{grid-template-columns:1fr}
.question-card{border-radius:18px}
.actions{flex-direction:column}
.actions .btn{width:100%}
.quiz-top{align-items:flex-start}
.quiz-controls{flex-direction:column;align-items:stretch}
.quiz-top .btn{padding:8px 11px}
.setup-card{padding:22px}
footer{grid-template-columns:1fr;text-align:center;gap:6px}footer>span:last-child{text-align:center}
.learning-intro{grid-template-columns:1fr}.learning-progress{text-align:left}.lesson-card-grid{grid-template-columns:1fr}.learning-actions{flex-direction:column}.learning-actions .btn{width:100%}.lesson-progress-row{grid-template-columns:1fr}.lesson-footer{grid-template-columns:1fr}.lesson-footer>div:last-child{text-align:left}.lesson-footer .btn{width:100%}
}