:root{--navy:#10233f;--ink:#182235;--muted:#728096;--line:#e8edf3;--bg:#f6f8fb;--teal:#21a89a;--teal-dark:#138a7e;--amber:#f5aa39;--danger:#df5c69;--white:#fff;--shadow:0 14px 40px rgba(16,35,63,.08)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:"IBM Plex Sans Thai",system-ui,sans-serif;font-size:15px}button,input{font:inherit}button{cursor:pointer;border:0}.mono{font-family:"DM Mono",monospace}.login-page{min-height:100vh;display:grid;grid-template-columns:1.05fr .95fr;background:#fff}.brand-pane{background:var(--navy);color:#fff;padding:50px max(7vw,42px);position:relative;overflow:hidden;display:flex;flex-direction:column}.brand-pane:after{content:"";position:absolute;width:430px;height:430px;border:1px solid rgba(255,255,255,.15);border-radius:50%;right:-170px;bottom:-170px;box-shadow:0 0 0 55px rgba(255,255,255,.035),0 0 0 110px rgba(255,255,255,.025)}.logo{font-size:22px;font-weight:700;letter-spacing:-.5px}.logo span{color:#5de0d1}.brand-pane h1{font-size:clamp(38px,4vw,64px);line-height:1.14;letter-spacing:-1.8px;max-width:600px;margin:auto 0 22px}.brand-pane p{color:#c2cede;max-width:470px;line-height:1.8;font-size:17px}.feature-row{display:flex;gap:26px;margin-top:55px}.feature{display:flex;align-items:center;gap:10px;color:#d9e3ef;font-size:14px}.dot{width:9px;height:9px;background:#5de0d1;border-radius:50%}.login-box{padding:clamp(40px,8vw,115px);display:flex;align-items:center;justify-content:center}.login-card{width:min(100%,425px)}.eyebrow{font-family:"DM Mono",monospace;color:var(--teal-dark);font-size:12px;letter-spacing:.9px;text-transform:uppercase}.login-card h2{font-size:33px;letter-spacing:-1px;margin:12px 0 9px}.login-card>p{color:var(--muted);line-height:1.7;margin-bottom:33px}.field label{display:block;font-size:13px;font-weight:600;margin-bottom:8px}.field input{width:100%;padding:14px 16px;border:1px solid #dce3ec;border-radius:10px;outline:none;transition:.2s}.field input:focus{border-color:var(--teal);box-shadow:0 0 0 3px rgba(33,168,154,.12)}.primary{background:var(--teal);color:#fff;border-radius:10px;padding:14px 18px;font-weight:600;width:100%;margin-top:20px;transition:.2s}.primary:hover{background:var(--teal-dark);transform:translateY(-1px)}.login-note{font-size:12px;color:#8d99aa;text-align:center;margin-top:22px}.admin-link{margin-top:38px;padding-top:22px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.admin-link button{color:var(--teal-dark);background:none;font-weight:700;padding:0;margin-left:4px}.layout{min-height:100vh;display:grid;grid-template-columns:250px 1fr}.sidebar{background:var(--navy);color:#c0cede;padding:29px 16px;display:flex;flex-direction:column}.sidebar .logo{padding:0 13px;color:white}.role{font-family:"DM Mono",monospace;font-size:10px;letter-spacing:1.1px;color:#75d9d0;margin:38px 13px 13px}.nav-btn{background:transparent;color:#c0cede;text-align:left;padding:12px 13px;border-radius:8px;margin:2px 0;font-size:14px}.nav-btn.active,.nav-btn:hover{background:rgba(255,255,255,.1);color:#fff}.nav-btn .nav-icon{width:23px;display:inline-block}.sidebar-footer{margin-top:auto;border-top:1px solid rgba(255,255,255,.12);padding:18px 13px 4px;font-size:12px;line-height:1.55}.sidebar-footer strong{color:#fff;font-size:13px}.workspace{padding:28px clamp(25px,4vw,58px);max-width:1500px}.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:35px}.breadcrumbs{font-family:"DM Mono",monospace;font-size:11px;color:#8996a8}.user{display:flex;align-items:center;gap:10px}.avatar{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:#dcefeb;color:var(--teal-dark);font-size:13px;font-weight:700}.user-name{font-size:13px;font-weight:600}.user-role{font-size:11px;color:var(--muted)}.page-title{display:flex;align-items:end;justify-content:space-between;margin-bottom:25px}.page-title h1{font-size:30px;margin:0;letter-spacing:-1px}.page-title p{margin:5px 0 0;color:var(--muted)}.outlined{padding:10px 14px;background:white;border:1px solid #dce3ec;color:var(--ink);border-radius:8px;font-size:13px;font-weight:600}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:28px}.stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:19px;box-shadow:0 3px 13px rgba(16,35,63,.025)}.stat-head{font-size:13px;color:var(--muted);display:flex;justify-content:space-between}.stat-value{font-size:28px;font-weight:700;letter-spacing:-1px;margin-top:10px}.stat-trend{font-size:12px;color:var(--teal-dark);margin-top:5px}.grid{display:grid;grid-template-columns:1.42fr .88fr;gap:20px}.panel{background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px;box-shadow:0 3px 13px rgba(16,35,63,.025)}.panel h3{font-size:16px;margin:0}.panel-sub{font-size:12px;color:var(--muted);margin:4px 0 19px}.exam-row{display:flex;align-items:center;padding:15px 0;border-bottom:1px solid var(--line);gap:14px}.exam-row:last-child{border:0;padding-bottom:0}.exam-icon{width:39px;height:39px;display:grid;place-items:center;border-radius:9px;background:#f0f6f7;color:var(--teal-dark)}.exam-title{font-size:14px;font-weight:600}.exam-meta{font-size:12px;color:var(--muted);margin-top:3px}.tag{margin-left:auto;font-size:11px;padding:4px 8px;border-radius:20px;background:#edf9f7;color:var(--teal-dark);white-space:nowrap}.tag.amber{background:#fff7e8;color:#bd7915}.tag.gray{background:#f1f3f6;color:#718094}.activity{display:flex;gap:12px;margin:15px 0}.activity-dot{height:8px;width:8px;border-radius:50%;background:var(--teal);margin-top:6px}.activity p{margin:0;font-size:13px;line-height:1.5}.activity span{color:var(--muted);font-size:11px}.section-tabs{display:flex;gap:7px;border-bottom:1px solid var(--line);margin-bottom:23px}.tab{background:transparent;padding:0 0 11px;margin-right:19px;color:var(--muted);font-size:13px;border-bottom:2px solid transparent}.tab.active{color:var(--teal-dark);font-weight:600;border-bottom-color:var(--teal)}.table{width:100%;border-collapse:collapse;text-align:left}.table th{font-size:11px;letter-spacing:.3px;color:#8996a8;font-weight:600;padding:0 12px 12px}.table td{padding:13px 12px;border-top:1px solid var(--line);font-size:13px}.student-id{font-family:"DM Mono",monospace;color:#6b788b;font-size:11px}.score{font-weight:700}.score.good{color:var(--teal-dark)}.score.mid{color:#c9821c}.empty-action{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.filter{padding:9px 12px;border:1px solid var(--line);border-radius:8px;color:var(--muted);font-size:12px;background:#fff}.student-layout{max-width:1100px;margin:auto}.welcome{background:linear-gradient(115deg,#10233f,#1a3c61);color:white;padding:28px;border-radius:14px;display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}.welcome h1{margin:3px 0;font-size:28px}.welcome p{color:#c4d2e1;margin:0}.exam-card{border-left:4px solid var(--teal)}.progress{height:6px;background:#e7edf2;border-radius:9px;overflow:hidden;margin:16px 0 8px}.progress i{display:block;background:var(--teal);height:100%;border-radius:9px}.start{background:var(--navy);color:white;padding:9px 13px;border-radius:8px;margin-left:auto;font-size:12px}.exam-shell{max-width:980px;margin:auto}.exam-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}.timer{color:#c75b5d;background:#fff2f2;padding:9px 12px;border-radius:8px;font-family:"DM Mono",monospace;font-size:14px}.question-layout{display:grid;grid-template-columns:1fr 230px;gap:20px}.question{font-size:19px;line-height:1.7;margin:18px 0 26px}.choice{display:flex;align-items:center;gap:12px;border:1px solid var(--line);padding:14px;border-radius:9px;margin:10px 0;font-size:14px;transition:.15s}.choice:hover,.choice.selected{border-color:var(--teal);background:#f0fbf9}.choice b{width:25px;height:25px;border:1px solid #c9d3df;border-radius:50%;display:grid;place-items:center;color:var(--muted);font-size:11px}.choice.selected b{background:var(--teal);color:#fff;border-color:var(--teal)}.qnav{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;margin-top:13px}.qnav button{aspect-ratio:1;border-radius:6px;background:#f0f3f6;color:#6f7d90;font-size:11px}.qnav button.current{background:var(--navy);color:#fff}.qnav button.done{background:#daf1ed;color:var(--teal-dark)}.exam-actions{display:flex;justify-content:space-between;margin-top:28px}.secondary{background:white;color:var(--ink);border:1px solid var(--line);padding:11px 15px;border-radius:8px;font-size:13px}.submit{background:var(--teal);color:#fff;padding:11px 15px;border-radius:8px;font-size:13px;font-weight:600}.hidden{display:none}@media(max-width:850px){.login-page{grid-template-columns:1fr}.brand-pane{min-height:340px}.layout{grid-template-columns:1fr}.sidebar{display:none}.stats{grid-template-columns:repeat(2,1fr)}.grid,.question-layout{grid-template-columns:1fr}.question-layout aside{order:-1}.workspace{padding:23px}.page-title{align-items:start;gap:15px}.welcome{align-items:start;gap:15px;flex-direction:column}}@media(max-width:500px){.login-box{padding:42px 25px}.stats{grid-template-columns:1fr}.brand-pane{padding:35px 27px}.feature-row{gap:14px;flex-wrap:wrap}.table{font-size:11px}.table th:nth-child(4),.table td:nth-child(4){display:none}}