:root{--navy:#0F1B2D;--navy-mid:#172436;--navy-card:#1C2E42;--navy-hi:#22374F;--gold:#C9A84C;--gold-l:#E2C97E;--gold-d:#7A6030;--ivory:#F0EBE0;--ivory-d:#B8B0A0;--green-bg:rgba(39,174,96,.13);--green-b:rgba(39,174,96,.38);--green-t:#4CD98A;--red-bg:rgba(224,82,82,.11);--red-b:rgba(224,82,82,.35);--red-t:#E05252;--border:rgba(201,168,76,.16);--border-d:rgba(201,168,76,.07)}*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--navy);color:var(--ivory);font-family:Vazirmatn,sans-serif;font-size:15px;line-height:1.85;min-height:100vh}.tile{width:100%;height:13px;background-image:repeating-linear-gradient(45deg,var(--gold-d) 0,var(--gold-d) 1px,transparent 1px,transparent 10px),repeating-linear-gradient(-45deg,var(--gold-d) 0,var(--gold-d) 1px,transparent 1px,transparent 10px);opacity:.55}header{position:relative;background:linear-gradient(155deg,#0A1520,#172436 60%,#0F1B2D);border-bottom:1px solid var(--border);padding:50px 32px 38px;text-align:center;overflow:hidden}header:before{content:"";position:absolute;inset:0;background:radial-gradient(ellipse 70% 50% at 50% 0,rgba(201,168,76,.07) 0,transparent 70%);pointer-events:none}.eyebrow{font-size:10.5px;font-weight:600;letter-spacing:.22em;color:var(--gold);text-transform:uppercase;margin-bottom:14px;opacity:.85}header h1{font-size:clamp(19px,3.2vw,30px);font-weight:900;color:#fff;line-height:1.35;margin-bottom:10px}header h1 span{color:var(--gold)}.hero-sub{font-size:13px;color:var(--ivory-d);max-width:580px;margin:0 auto 22px;line-height:1.7}.badges{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}.badge{background:rgba(201,168,76,.1);border:1px solid var(--border);color:var(--gold-l);font-size:11px;font-weight:600;padding:4px 13px;border-radius:20px}.score-bar{background:var(--navy-mid);border-bottom:1px solid var(--border-d);padding:13px 32px;display:flex;justify-content:center;gap:36px;flex-wrap:wrap}.stat{text-align:center}.stat-n{font-size:20px;font-weight:900;color:var(--gold);display:block;line-height:1.1}.stat-l{font-size:10.5px;color:var(--ivory-d);margin-top:2px}.ch-nav{background:var(--navy-mid);border-bottom:1px solid var(--border-d);padding:11px 28px;display:flex;gap:7px;flex-wrap:wrap;justify-content:center}.ch-pill{background:transparent;border:1px solid var(--border);color:var(--ivory-d);font-family:Vazirmatn,sans-serif;font-size:10.5px;font-weight:500;padding:4px 11px;border-radius:20px;cursor:pointer;transition:all .18s;text-decoration:none;display:inline-block}.ch-pill:hover{background:rgba(201,168,76,.1);border-color:var(--gold-d);color:var(--gold-l)}.progress-strip{position:-webkit-sticky;position:sticky;top:0;z-index:50;background:rgba(15,27,45,.96);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border-d);padding:9px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}.prog-label{font-size:11px;color:var(--ivory-d);white-space:nowrap}.prog-bar-wrap{flex:1 1;height:5px;background:rgba(255,255,255,.07);border-radius:3px;overflow:hidden}.prog-bar-fill{height:100%;background:linear-gradient(90deg,var(--gold-d),var(--gold));border-radius:3px;transition:width .4s ease;width:0}.prog-count{font-size:11px;font-weight:700;color:var(--gold);white-space:nowrap}main{max-width:860px;margin:0 auto;padding:40px 20px 80px}.ch-section{margin-bottom:48px}.ch-header{gap:12px;margin-bottom:18px;padding-bottom:12px;border-bottom:1px solid var(--border)}.ch-header,.ch-num{display:flex;align-items:center}.ch-num{background:linear-gradient(135deg,var(--gold),var(--gold-d));color:var(--navy);font-size:11.5px;font-weight:900;width:33px;height:33px;border-radius:8px;justify-content:center;flex-shrink:0}.ch-title{font-size:16px;font-weight:700;color:var(--ivory);flex:1 1}.ch-count{font-size:10.5px;color:var(--ivory-d);background:var(--border-d);padding:3px 10px;border-radius:12px}.ch-count,.q-card{border:1px solid var(--border-d)}.q-card{background:var(--navy-card);border-radius:14px;margin-bottom:16px;overflow:hidden;transition:border-color .2s}.q-card:hover{border-color:var(--border)}.q-head{display:flex;align-items:flex-start;gap:12px;padding:18px 20px 12px}.q-num{background:var(--navy-hi);border:1px solid var(--border);color:var(--gold);font-size:11.5px;font-weight:700;min-width:32px;height:32px;border-radius:7px;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px}.q-text{flex:1 1;font-size:14.5px;line-height:1.9;color:var(--ivory)}.q-src{font-size:10.5px;color:var(--gold-d);margin-top:5px;font-weight:600}.q-opts{padding:0 20px 6px;display:grid;grid-template-columns:1fr 1fr;grid-gap:8px;gap:8px}@media(max-width:540px){.q-opts{grid-template-columns:1fr}}.opt{background:var(--navy-hi);border:1px solid var(--border-d);border-radius:9px;padding:11px 14px;font-size:13.5px;color:var(--ivory-d);display:flex;align-items:flex-start;gap:10px;cursor:pointer;transition:border-color .18s,background .18s,color .18s;line-height:1.65;-webkit-user-select:none;-moz-user-select:none;user-select:none}.opt:hover:not(.locked){background:rgba(201,168,76,.1);border-color:var(--gold-d);color:var(--ivory)}.opt-lbl{background:rgba(201,168,76,.12);color:var(--gold);font-size:10.5px;font-weight:700;min-width:22px;height:22px;border-radius:5px;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:1px;transition:background .18s,color .18s}.opt.correct-chosen,.opt.correct-reveal{background:var(--green-bg)!important;border-color:var(--green-b)!important;color:var(--ivory)!important}.opt.correct-chosen .opt-lbl,.opt.correct-reveal .opt-lbl{background:rgba(39,174,96,.25);color:var(--green-t)}.opt.wrong-chosen{background:var(--red-bg)!important;border-color:var(--red-b)!important;color:var(--ivory-d)!important;opacity:.8}.opt.wrong-chosen .opt-lbl{background:rgba(224,82,82,.2);color:var(--red-t)}.opt.locked{cursor:default}.opt.locked:not(.correct-chosen):not(.correct-reveal):not(.wrong-chosen){opacity:.45}.result-badge{display:none;align-items:center;gap:8px;margin:10px 20px 0;padding:8px 14px;border-radius:8px;font-size:12.5px;font-weight:600}.result-badge.show{display:flex}.result-badge.ok{background:var(--green-bg);border:1px solid var(--green-b);color:var(--green-t)}.result-badge.ng{background:var(--red-bg);border:1px solid var(--red-b);color:var(--red-t)}.q-footer{padding:10px 20px 16px;display:flex;justify-content:flex-end}.btn-show{background:transparent;border:1px solid var(--border);color:var(--ivory-d);font-family:Vazirmatn,sans-serif;font-size:11.5px;padding:5px 14px;border-radius:20px;cursor:pointer;transition:all .18s}.btn-show:hover{background:rgba(201,168,76,.08);border-color:var(--gold-d);color:var(--gold-l)}.btn-show.hidden{display:none}.q-explain{max-height:0;overflow:hidden;transition:max-height .38s ease,opacity .3s ease;opacity:0;border-top:1px solid transparent;padding:0 20px}.q-explain.open{max-height:900px;opacity:1;border-top:1px solid var(--border-d);padding:16px 20px 20px;margin-top:10px}.explain-inner{font-size:13px;color:var(--ivory);line-height:1.95;background:rgba(42,138,156,.06);border:1px solid rgba(42,138,156,.15);border-radius:8px;padding:13px 15px}.explain-inner strong{color:var(--gold-l)}.src-note{margin-top:9px;font-size:11px;color:var(--ivory-d);opacity:.75;display:flex;gap:6px;align-items:flex-start}.src-note:before{content:"📌";flex-shrink:0}.katex{display:inline-block}.katex,.katex-display{direction:ltr}@media(prefers-reduced-motion:no-preference){.q-card{opacity:0;transform:translateY(14px);animation:fu .4s ease forwards}.q-card:first-child{animation-delay:.04s}.q-card:nth-child(2){animation-delay:.09s}.q-card:nth-child(3){animation-delay:.14s}.q-card:nth-child(4){animation-delay:.19s}.q-card:nth-child(5){animation-delay:.24s}@keyframes fu{to{opacity:1;transform:translateY(0)}}}.auth-shell{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.auth-card{background:var(--navy-card);border:1px solid var(--border);border-radius:16px;padding:40px 32px;max-width:420px;width:100%;text-align:center}.auth-card h1{font-size:20px;font-weight:900;color:#fff;margin-bottom:10px}.auth-card p{font-size:13px;color:var(--ivory-d);line-height:1.8;margin-bottom:26px}.btn-google{display:inline-flex;align-items:center;justify-content:center;gap:10px;background:var(--ivory);color:var(--navy);font-family:Vazirmatn,sans-serif;font-size:14px;font-weight:700;padding:12px 22px;border-radius:10px;border:none;cursor:pointer;transition:opacity .18s;width:100%}.btn-google:hover{opacity:.9}.onboard-card{background:var(--navy-card);border:1px solid var(--border);border-radius:16px;padding:36px 30px;max-width:480px;width:100%}.onboard-card h1{font-size:19px;font-weight:900;color:#fff;margin-bottom:8px;text-align:center}.onboard-card p.hint{font-size:12.5px;color:var(--ivory-d);text-align:center;margin-bottom:28px;line-height:1.7}.field-group{margin-bottom:20px}.field-group label{display:block;font-size:12.5px;font-weight:700;color:var(--gold-l);margin-bottom:8px}.field-group select{width:100%;background:var(--navy-hi);border:1px solid var(--border);color:var(--ivory);font-family:Vazirmatn,sans-serif;font-size:13.5px;padding:11px 14px;border-radius:9px;cursor:pointer}.field-group select:focus{outline:none;border-color:var(--gold-d)}.field-group input[type=text]{width:100%;background:var(--navy-hi);border:1px solid var(--border);color:var(--ivory);font-family:Vazirmatn,sans-serif;font-size:13.5px;padding:11px 14px;border-radius:9px;margin-top:8px}.field-group input[type=text]:focus{outline:none;border-color:var(--gold-d)}.field-group input[type=text]::placeholder{color:var(--ivory-d)}.btn-primary{width:100%;background:linear-gradient(135deg,var(--gold),var(--gold-d));color:var(--navy);font-family:Vazirmatn,sans-serif;font-size:14px;font-weight:800;padding:13px 20px;border-radius:10px;border:none;cursor:pointer;transition:opacity .18s;margin-top:6px}.btn-primary:hover{opacity:.92}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.form-error{color:var(--red-t);font-size:12px;margin-top:-10px;margin-bottom:16px}.finish-bar{position:-webkit-sticky;position:sticky;bottom:0;background:rgba(15,27,45,.96);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-top:1px solid var(--border);padding:14px 24px;display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap}.finish-bar .btn-primary{width:auto;padding:11px 28px}.result-shell{max-width:640px;margin:0 auto;padding:60px 20px 80px;text-align:center}.result-score{font-size:52px;font-weight:900;color:var(--gold);line-height:1}.result-max{font-size:16px;color:var(--ivory-d);margin-top:6px}.result-pct{font-size:18px;font-weight:700;color:var(--ivory);margin-top:18px}.result-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:12px;gap:12px;margin:32px 0}.result-stat{background:var(--navy-card);border:1px solid var(--border-d);border-radius:12px;padding:18px 10px}.result-stat .n{font-size:22px;font-weight:900}.result-stat .l{font-size:11px;color:var(--ivory-d);margin-top:4px}.result-stat.correct .n{color:var(--green-t)}.result-stat.incorrect .n{color:var(--red-t)}.result-stat.unanswered .n{color:var(--ivory-d)}.exam-shell{min-height:100vh}.exam-sidebar{position:fixed;top:0;bottom:0;left:0;width:272px;background:var(--navy-mid);border-left:1px solid var(--border);display:flex;flex-direction:column;z-index:40;direction:rtl}.sidebar-header{padding:18px 16px 14px;border-bottom:1px solid var(--border-d);flex-shrink:0}.sidebar-header .title{font-size:12.5px;font-weight:800;color:var(--gold-l)}.sidebar-header .sub{font-size:10.5px;color:var(--ivory-d);margin-top:4px}.sidebar-scroll{flex:1 1;overflow-y:auto;padding:10px 12px 24px}.sidebar-chapter{margin-bottom:16px}.sidebar-chapter-title{font-size:10.5px;font-weight:700;color:var(--ivory-d);padding:6px 4px;opacity:.8;display:flex;align-items:center;gap:6px}.sidebar-chapter-num{background:var(--border-d);color:var(--gold);width:16px;height:16px;border-radius:4px;display:inline-flex;align-items:center;justify-content:center;font-size:9px;font-weight:800;flex-shrink:0}.sidebar-q-list{display:flex;flex-wrap:wrap;gap:6px}.sidebar-q-item{position:relative;width:30px;height:30px;border-radius:7px;background:var(--navy-hi);border:1px solid var(--border-d);color:var(--ivory-d);font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .15s;font-family:Vazirmatn,sans-serif}.sidebar-q-item:hover{border-color:var(--gold-d);color:var(--ivory)}.sidebar-q-item.current{border-color:var(--gold);box-shadow:0 0 0 2px rgba(201,168,76,.25);color:var(--gold-l)}.sidebar-q-item.selected{background:rgba(201,168,76,.16);border-color:var(--gold-d);color:var(--gold-l)}.sidebar-q-item.revealed-correct{background:var(--green-bg);border-color:var(--green-b);color:var(--green-t)}.sidebar-q-item.revealed-incorrect{background:var(--red-bg);border-color:var(--red-b);color:var(--red-t)}.sidebar-q-item .bm-dot{position:absolute;top:-4px;left:-4px;width:12px;height:12px;color:var(--gold)}.exam-main{margin-left:272px;min-height:100vh;display:flex;flex-direction:column}.exam-topbar{position:-webkit-sticky;position:sticky;top:0;z-index:30;background:rgba(15,27,45,.96);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border-d);padding:12px 28px;display:flex;align-items:center;justify-content:space-between;gap:16px}.exam-topbar .progress-text{font-size:12px;color:var(--ivory-d)}.overview-btn{display:inline-flex;align-items:center;gap:7px;background:rgba(201,168,76,.1);border:1px solid var(--border);color:var(--gold-l);font-family:Vazirmatn,sans-serif;font-size:12px;font-weight:700;padding:8px 15px;border-radius:20px;cursor:pointer;transition:all .18s}.overview-btn:hover{background:rgba(201,168,76,.18);border-color:var(--gold-d)}.q-single-wrap{flex:1 1;max-width:760px;width:100%;margin:0 auto;padding:32px 20px 24px;display:flex;flex-direction:column}.q-single{background:var(--navy-card);border:1px solid var(--border-d);border-radius:16px;overflow:hidden}.q-single-head{display:flex;align-items:flex-start;gap:14px;padding:24px 24px 16px}.q-single-head .q-num{background:var(--navy-hi);border:1px solid var(--border);color:var(--gold);font-size:12.5px;font-weight:700;min-width:36px;height:36px;border-radius:9px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.q-single-head .q-text{flex:1 1;font-size:15.5px;line-height:2}.q-single-head .q-src{font-size:10.5px;color:var(--gold-d);margin-top:6px;font-weight:600}.bookmark-btn{background:transparent;border:1px solid var(--border);color:var(--ivory-d);width:36px;height:36px;border-radius:9px;display:flex;align-items:center;justify-content:center;cursor:pointer;flex-shrink:0;transition:all .18s}.bookmark-btn:hover{border-color:var(--gold-d);color:var(--gold-l)}.bookmark-btn.active{background:rgba(201,168,76,.15);border-color:var(--gold-d);color:var(--gold)}.q-single .q-opts{padding:4px 24px 8px;display:grid;grid-template-columns:1fr 1fr;grid-gap:10px;gap:10px}@media(max-width:600px){.q-single .q-opts{grid-template-columns:1fr}}.q-single .opt.selected{background:rgba(201,168,76,.12)!important;border-color:var(--gold-d)!important;color:var(--ivory)!important}.q-single .opt.selected .opt-lbl{background:rgba(201,168,76,.28);color:var(--gold-l)}.q-actions{padding:14px 24px;display:flex;align-items:center;gap:10px;flex-wrap:wrap;border-top:1px solid var(--border-d);margin-top:8px}.btn-full-answer,.btn-tip{display:inline-flex;align-items:center;gap:7px;background:transparent;border:1px solid var(--border);color:var(--ivory-d);font-family:Vazirmatn,sans-serif;font-size:12px;font-weight:700;padding:8px 15px;border-radius:20px;cursor:pointer;transition:all .18s}.btn-tip:hover{background:rgba(201,168,76,.08)}.btn-tip.active,.btn-tip:hover{border-color:var(--gold-d);color:var(--gold-l)}.btn-tip.active{background:rgba(201,168,76,.14)}.btn-full-answer{border-color:rgba(42,138,156,.35);color:#7EC8D6}.btn-full-answer:hover{background:rgba(42,138,156,.1)}.btn-full-answer:disabled{opacity:.45;cursor:default}.tip-box{margin:0 24px 14px;background:rgba(201,168,76,.08);border:1px solid rgba(201,168,76,.22);border-radius:8px;padding:12px 15px;font-size:12.5px;color:var(--gold-l);line-height:1.85;display:flex;gap:9px;align-items:flex-start}.tip-box svg{flex-shrink:0;margin-top:2px}.q-single .result-badge{margin:0 24px}.q-single .q-explain{padding:0 24px}.q-single .q-explain.open{padding:16px 24px 20px}.q-nav-buttons{display:flex;justify-content:space-between;gap:12px;margin-top:20px}.q-nav-btn{display:inline-flex;align-items:center;gap:8px;background:var(--navy-card);border:1px solid var(--border);color:var(--ivory);font-family:Vazirmatn,sans-serif;font-size:13px;font-weight:700;padding:11px 20px;border-radius:10px;cursor:pointer;transition:all .18s}.q-nav-btn:hover:not(:disabled){border-color:var(--gold-d);background:rgba(201,168,76,.06)}.q-nav-btn:disabled{opacity:.35;cursor:not-allowed}.overview-backdrop{position:fixed;inset:0;background:rgba(6,11,19,.72);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:100;display:flex;align-items:center;justify-content:center;padding:20px}.overview-modal{background:var(--navy-card);border:1px solid var(--border);border-radius:16px;max-width:480px;width:100%;max-height:80vh;display:flex;flex-direction:column}.overview-modal-head{display:flex;align-items:center;justify-content:space-between;padding:18px 20px;border-bottom:1px solid var(--border-d)}.overview-modal-head h2{font-size:15px;font-weight:800;color:#fff}.overview-modal-close{background:transparent;border:none;color:var(--ivory-d);cursor:pointer;padding:4px}.overview-modal-close:hover{color:var(--ivory)}.overview-legend{display:flex;gap:14px;flex-wrap:wrap;padding:12px 20px;font-size:10.5px;color:var(--ivory-d);border-bottom:1px solid var(--border-d)}.overview-legend span{display:inline-flex;align-items:center;gap:5px}.legend-dot{width:9px;height:9px;border-radius:3px;display:inline-block}.legend-dot.empty{background:var(--navy-hi);border:1px solid var(--border-d)}.legend-dot.selected{background:rgba(201,168,76,.35);border:1px solid var(--gold-d)}.legend-dot.correct{background:var(--green-b)}.legend-dot.incorrect{background:var(--red-b)}.overview-grid{display:grid;grid-template-columns:repeat(6,1fr);grid-gap:10px;gap:10px;padding:18px 20px;overflow-y:auto}.overview-cell{position:relative;aspect-ratio:1;border-radius:9px;background:var(--navy-hi);border:1px solid var(--border-d);color:var(--ivory-d);font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .15s}.overview-cell:hover{border-color:var(--gold-d)}.overview-cell.current{box-shadow:0 0 0 2px var(--gold)}.overview-cell.selected{background:rgba(201,168,76,.16);border-color:var(--gold-d);color:var(--gold-l)}.overview-cell.revealed-correct{background:var(--green-bg);border-color:var(--green-b);color:var(--green-t)}.overview-cell.revealed-incorrect{background:var(--red-bg);border-color:var(--red-b);color:var(--red-t)}.overview-cell .bm-dot{position:absolute;top:-5px;left:-5px;width:14px;height:14px;color:var(--gold)}@media(max-width:860px){.exam-sidebar{transform:translateX(-100%);transition:transform .25s ease}.exam-sidebar.open{transform:translateX(0)}.exam-main{margin-left:0}.sidebar-toggle-btn{display:inline-flex}}.sidebar-toggle-btn{display:none;align-items:center;gap:6px;background:transparent;border:1px solid var(--border);color:var(--ivory-d);font-family:Vazirmatn,sans-serif;font-size:12px;padding:7px 12px;border-radius:20px;cursor:pointer}