/* Premium chemistry learning experience */
:root{--gold:#d8bd82;--gold-soft:#f0dfb8;--ink:#0c0e12;--surface:#171a20;--surface-2:#20242c;--line:#343943;--muted:#a9a398}
body{background:radial-gradient(ellipse at 82% -12%,#66502a38,transparent 38%),radial-gradient(ellipse at 5% 48%,#3d424d25,transparent 34%),#0c0e12}
.top{position:sticky;top:0;z-index:8;background:#0c0e12e8;backdrop-filter:blur(18px);padding-inline:24px}
.brand-copy b{color:var(--gold-soft)}
.logo-mark{background:linear-gradient(145deg,#332b1d,#121419);border-color:#d8bd826e}
.eyebrow{border-color:#d8bd8240;background:#d8bd8210;color:var(--gold-soft)}
.dot{background:#a7c4a2;box-shadow:0 0 12px #a7c4a2}
.primary{background:linear-gradient(120deg,#e8d09a,#b6955b);color:#17140d;box-shadow:0 8px 25px #d8bd821c}
.ghost{border-color:#ffffff20;background:#ffffff08}
.card{background:linear-gradient(145deg,#20232a,#15171c);border-color:#ffffff14;box-shadow:0 18px 42px #0004;transition:transform .22s,border-color .22s}
.card:hover{border-color:#d8bd8240;transform:translateY(-2px)}
.card-icon{background:#d8bd8212;border-color:#d8bd8238;color:var(--gold-soft)}
.pill{background:#d8bd8210;border-color:#d8bd8240;color:var(--gold-soft)}
#studentApp{max-width:1240px;padding-bottom:72px}
#studentApp .section-head{padding:22px 24px;background:linear-gradient(120deg,#24231f,#17191e);border:1px solid #d8bd8230;border-radius:22px;margin:0 0 24px}
#studentApp .section-head h2{font-size:clamp(22px,3vw,30px)}
#studentApp .app-stats{gap:18px}
#studentApp .app-stats .card{position:relative;overflow:hidden;min-height:130px;padding:24px}
#studentApp .app-stats .card:after{content:"";position:absolute;width:100px;height:100px;border:1px solid #d8bd8222;border-radius:50%;left:-30px;bottom:-55px}
#studentApp .app-stats .card h3{color:var(--gold-soft);font-size:32px}
.app-heading{display:flex;align-items:center;gap:12px;font-size:22px;color:#f3e9d4;margin-top:40px}
.app-heading:before{content:"";width:4px;height:25px;border-radius:4px;background:linear-gradient(#f0dfb8,#a88750)}
.admin-create{margin:22px 0;padding:clamp(18px,3vw,30px)}
.field input,.field textarea,.field select{width:100%;padding:13px 14px;border:1px solid #3c414b;background:#101216;border-radius:12px;color:#f5f1e8;outline:none;font:inherit}
.field input:focus,.field textarea:focus,.field select:focus{border-color:#d8bd82;box-shadow:0 0 0 3px #d8bd8217}
.field textarea{resize:vertical;line-height:1.9}
.field label{color:#d8d0c0;font-weight:600}
.question-builder-head,.question-editor-top{display:flex;align-items:center;justify-content:space-between;gap:15px}
.question-builder-head{margin:28px 0 14px;padding-top:20px;border-top:1px solid #ffffff16}
.question-builder-head h3{margin:0 0 5px;color:var(--gold-soft)}
.question-builder-head p{font-size:12px;color:var(--muted);margin:0}
.question-editor{margin:14px 0;padding:20px;background:#111318;border-color:#d8bd822b}
.question-editor-top{padding-bottom:12px;border-bottom:1px solid #ffffff13}
.question-editor-top b{color:var(--gold-soft)}
.text-danger{border:0;background:#7e30301c;color:#f2a5a5;padding:8px 12px;border-radius:9px;cursor:pointer}
.options-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 14px}
.question-meta{display:grid;grid-template-columns:1fr 1fr;gap:14px}
#studentApp .test{align-items:flex-start;padding:20px}
#studentApp .test-actions{justify-content:flex-end}
#studentApp .test h3{font-size:16px;color:#f2e9d8}
#studentApp .test p{font-size:12px}
#studentApp .question{padding:18px;margin:16px 0;background:#111318;border:1px solid #ffffff14;border-radius:15px}
#studentApp .answer-option{display:flex;align-items:center;gap:10px;padding:12px;margin-top:8px;background:#ffffff06;border:1px solid #ffffff12;border-radius:10px;cursor:pointer}
#studentApp .answer-option:has(input:checked){border-color:#d8bd82;background:#d8bd8214}
.table-wrap{overflow:auto;border:1px solid #ffffff17;border-radius:16px;margin:14px 0 28px;background:#17191e}
.data-table{width:100%;border-collapse:collapse;min-width:620px}
.data-table th,.data-table td{padding:14px 16px;text-align:right;border-bottom:1px solid #ffffff10;font-size:12px}
.data-table th{background:#25231e;color:var(--gold-soft)}
.data-table td{color:#ddd6c9}
.result-number{font:800 42px "Plus Jakarta Sans";color:var(--gold-soft);margin:18px 0}
#headerProfile{border-color:#d8bd8250;color:#f0dfb8}
#headerLogout{padding:10px 14px}
#headerLogin{padding:10px 16px}
#studentApp details{padding:14px;background:#ffffff06;border-radius:12px}
#studentApp summary{color:var(--gold-soft);font-weight:700;cursor:pointer}
#studentApp ol{line-height:2.2;color:#ddd6c9}
.toast{background:#25231e;border-color:#d8bd8266;color:#fff4d9;box-shadow:0 14px 40px #0008}
@media(max-width:800px){#studentApp .app-stats{grid-template-columns:1fr 1fr}.options-grid{grid-template-columns:1fr}.question-meta{grid-template-columns:1fr}.top{padding-inline:12px}}
@media(max-width:480px){#studentApp .app-stats{grid-template-columns:1fr}.question-builder-head{align-items:flex-start;flex-direction:column}.nav{gap:7px}.nav .btn{padding:9px 10px;font-size:11px}}

.ph-result{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px;margin-top:14px;border:1px solid #69a98a;border-radius:13px;background:#69a98a20}.ph-result b{font-size:19px;color:#f4ead5}.ph-result span{font:700 13px "Plus Jakarta Sans";color:#ddd}.ph-scale{display:flex;justify-content:space-between;margin-top:10px;color:var(--muted);font-size:10px}.element-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin-top:12px}.element-tile{position:relative;display:flex;flex-direction:column;align-items:center;gap:4px;padding:10px 5px;background:#111318;border:1px solid #d8bd8230;border-radius:10px;min-width:0}.element-tile b{font:800 20px "Plus Jakarta Sans";color:var(--gold-soft)}.element-tile span{font-size:10px;color:#e5dece}.element-tile small{position:absolute;top:5px;left:7px;color:var(--muted);font-size:8px}@media(max-width:480px){.element-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
.exam-countdown{position:sticky;top:90px;z-index:3;margin:16px 0;padding:14px 18px;border:1px solid #d8bd8266;border-radius:13px;background:#242119;color:#f0dfb8;font:800 17px "Plus Jakarta Sans";text-align:center;box-shadow:0 8px 24px #0005}.exam-countdown:has(+form){letter-spacing:.4px}#studentApp .exam-card{padding:clamp(18px,3vw,30px)}#studentApp .exam-card h2{margin-top:12px;color:#f0dfb8}

.learning-progress{display:grid;grid-template-columns:minmax(150px,220px) 1fr;align-items:center;gap:24px;margin:10px 0 28px}.learning-progress h3{font:800 27px "Plus Jakarta Sans";color:var(--gold-soft);margin:9px 0 3px}.learning-progress p{color:var(--muted);font-size:12px;margin:0}.progress-track{height:12px;border-radius:20px;background:#ffffff12;overflow:hidden}.progress-track span{display:block;height:100%;border-radius:20px;background:linear-gradient(90deg,#a98b58,#f0dfb8);transition:width .35s}@media(max-width:600px){.learning-progress{grid-template-columns:1fr;gap:15px}}

/* Reliable section navigation on desktop and mobile */
html{scroll-behavior:smooth;scroll-padding-top:112px}
#features,#tests,#about{scroll-margin-top:112px}
.top{height:auto;min-height:82px;flex-wrap:wrap;gap:10px;padding-block:12px}
.nav{display:flex;align-items:center;justify-content:flex-end;gap:10px;flex-wrap:wrap}
.nav a{display:inline-flex!important;align-items:center;justify-content:center;padding:9px 13px;border:1px solid #d8bd8230;border-radius:11px;color:#e9dfcb;background:#ffffff06;font-size:12px;white-space:nowrap;cursor:pointer;transition:.2s}
.nav a:hover,.nav a:focus-visible{color:#f4dfb3;background:#d8bd8218;border-color:#d8bd82;outline:none}
@media(max-width:800px){.top{align-items:center;padding-inline:16px}.nav{width:100%;justify-content:center;gap:7px;padding:2px 0 8px}.nav a{display:inline-flex!important;flex:1 1 auto;min-width:0;padding:10px 8px;font-size:11px}.nav .btn{flex:0 0 auto}}
@media(max-width:420px){.nav a{font-size:10px;padding:9px 5px}.nav{gap:5px}}

.semester-switch{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:8px 0 22px;padding:18px 22px;border-color:#d8bd8255;background:linear-gradient(110deg,#27231b,#17191e)}
.semester-switch label{font-weight:800;color:var(--gold-soft)}
.semester-switch select{min-width:min(380px,100%);padding:12px 14px;border:1px solid #d8bd8266;border-radius:12px;background:#101216;color:#f4ead5;font:inherit}
.curriculum-seed{display:flex;justify-content:space-between;align-items:center;gap:18px;margin:20px 0;border-color:#d8bd8255}
.curriculum-seed h3{margin:0 0 6px;color:var(--gold-soft)}
.curriculum-seed p{margin:0;color:var(--muted);font-size:12px}
@media(max-width:600px){.semester-switch,.curriculum-seed{align-items:stretch;flex-direction:column}.semester-switch select{min-width:0;width:100%}}