:root{--ink:#0d0d14;--ink2:#2a2a3a;--muted:#6b6b82;--border:#e2e2ee;--surface:#f7f7fc;--white:#ffffff;--accent:#7c3aed;--accent2:#5b21b6;--green:#059669;--red:#dc2626;--amber:#d97706;--glow:rgba(124,58,237,0.10);--r:12px;--shadow:0 2px 20px rgba(13,13,20,0.08);--shadow2:0 8px 40px rgba(13,13,20,0.14)}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'IBM Plex Sans',sans-serif;background:var(--surface);color:var(--ink);min-height:100vh;line-height:1.6}
h1,h2,h3,h4{font-family:'Syne',sans-serif;letter-spacing:-0.02em}
.hdr{background:var(--ink);color:#fff;height:58px;display:flex;align-items:center;justify-content:space-between;padding:0 24px;position:sticky;top:0;z-index:100;box-shadow:0 2px 20px rgba(0,0,0,0.3)}
.hdr-brand{display:flex;align-items:center;gap:10px;font-family:'Syne',sans-serif;font-size:1.05rem;font-weight:700}
.hdr-pill{background:var(--accent);border-radius:6px;padding:3px 10px;font-size:0.75rem;font-weight:600;letter-spacing:0.04em;text-transform:uppercase}
.hdr-module{font-size:0.78rem;color:rgba(255,255,255,0.55);font-family:'IBM Plex Mono',monospace;margin-left:6px}
.timer{font-family:'IBM Plex Mono',monospace;font-size:1rem;font-weight:500;background:rgba(255,255,255,0.08);border:1px solid rgba(255,255,255,0.15);border-radius:8px;padding:6px 14px;display:none;align-items:center;gap:8px}
.timer.warn{background:rgba(220,38,38,0.25);border-color:rgba(220,38,38,0.5);animation:throb 1s ease-in-out infinite}
@keyframes throb{0%,100%{opacity:1}50%{opacity:.65}}
.page{display:none}.page.active{display:block}
/* Registration */
.reg-wrap{max-width:460px;margin:56px auto;padding:20px}
.reg-card{background:var(--white);border-radius:20px;box-shadow:var(--shadow2);overflow:hidden}
.reg-top{background:linear-gradient(135deg,var(--accent) 0%,var(--accent2) 100%);padding:32px 32px 24px;color:#fff;text-align:center}
.reg-top .icon{font-size:2.4rem;display:block;margin-bottom:10px}
.reg-top h2{font-size:1.7rem;margin-bottom:4px}
.reg-top p{opacity:.85;font-size:0.88rem}
.stat-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--border);border-bottom:1px solid var(--border)}
.stat-strip .s{background:var(--white);padding:12px 6px;text-align:center}
.stat-strip .s .val{font-family:'Syne',sans-serif;font-size:1.2rem;font-weight:700;color:var(--accent)}
.stat-strip .s .lbl{font-size:0.68rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-top:2px}
.reg-body{padding:24px 28px}
.field{margin-bottom:14px}
.field label{display:block;font-size:0.8rem;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:5px}
.field input,.field select{width:100%;border:1.5px solid var(--border);border-radius:8px;padding:10px 14px;font-family:inherit;font-size:0.93rem;outline:none;transition:border .2s,box-shadow .2s;background:var(--surface);color:var(--ink)}
.field input:focus,.field select:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--glow);background:var(--white)}
.phone-row{display:flex;gap:8px}
.phone-row select{width:130px;flex-shrink:0}
.phone-row input{flex:1}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 24px;border-radius:8px;font-family:'IBM Plex Sans',sans-serif;font-size:0.94rem;font-weight:600;cursor:pointer;border:none;transition:all .15s}
.btn-primary{background:var(--accent);color:#fff;width:100%}
.btn-primary:hover{background:var(--accent2);transform:translateY(-1px);box-shadow:0 4px 20px rgba(124,58,237,0.35)}
.btn-outline{background:transparent;border:1.5px solid var(--border);color:var(--ink2)}
.btn-outline:hover{border-color:var(--accent);color:var(--accent);background:var(--glow)}
.btn-danger{background:var(--red);color:#fff;width:100%}
.btn-danger:hover{background:#b91c1c}
/* Saving overlay */
.saving-overlay{position:fixed;inset:0;background:rgba(13,13,20,0.75);z-index:500;display:none;align-items:center;justify-content:center;flex-direction:column;gap:14px;backdrop-filter:blur(6px)}
.saving-overlay.show{display:flex}
.spin{width:40px;height:40px;border:3px solid rgba(255,255,255,0.2);border-top-color:#a78bfa;border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.saving-overlay p{color:#fff;font-size:0.95rem;font-weight:500}
/* Test Layout */
.test-wrap{max-width:1080px;margin:20px auto;padding:0 16px;display:grid;grid-template-columns:1fr 252px;gap:18px}
@media(max-width:760px){.test-wrap{grid-template-columns:1fr}.sidebar{order:-1}}
.mod-banner{background:var(--white);border-radius:var(--r);box-shadow:var(--shadow);padding:12px 20px;margin-bottom:12px;display:flex;align-items:center;justify-content:space-between;gap:12px;border-left:4px solid var(--accent)}
.mod-banner .mod-name{font-family:'Syne',sans-serif;font-size:0.88rem;font-weight:700;color:var(--accent)}
.mod-banner .mod-info{font-size:0.78rem;color:var(--muted)}
.q-card{background:var(--white);border-radius:var(--r);box-shadow:var(--shadow);padding:28px 32px}
.q-meta{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;flex-wrap:wrap;gap:8px}
.q-badge{font-family:'IBM Plex Mono',monospace;background:var(--ink);color:#fff;border-radius:6px;padding:4px 12px;font-size:0.8rem;font-weight:500}
.q-topic-tag{font-size:0.78rem;color:var(--muted);background:var(--surface);border:1px solid var(--border);padding:4px 10px;border-radius:20px}
.q-text{font-size:0.96rem;line-height:1.85;margin-bottom:24px;color:var(--ink2);white-space:pre-wrap;background:rgba(124,58,237,0.03);border:1px solid rgba(124,58,237,0.1);border-radius:10px;padding:18px 20px}
.q-text u{text-decoration:underline;text-decoration-color:var(--accent);text-underline-offset:3px;text-decoration-thickness:2.5px;font-weight:500}
.opts{display:flex;flex-direction:column;gap:9px}
.opt{display:flex;align-items:flex-start;gap:12px;padding:13px 16px;border:1.5px solid var(--border);border-radius:10px;cursor:pointer;transition:all .15s;background:var(--white);user-select:none}
.opt:hover{border-color:var(--accent);background:var(--glow)}
.opt.selected{border-color:var(--accent);background:var(--glow)}
.opt-letter{width:28px;height:28px;min-width:28px;border-radius:50%;border:1.5px solid var(--border);display:flex;align-items:center;justify-content:center;font-family:'IBM Plex Mono',monospace;font-size:0.8rem;font-weight:600;color:var(--muted);transition:all .15s;flex-shrink:0}
.opt.selected .opt-letter{background:var(--accent);border-color:var(--accent);color:#fff}
.opt-text{font-size:0.93rem;line-height:1.55;padding-top:4px}
.q-nav{display:flex;align-items:center;justify-content:space-between;margin-top:24px;gap:10px}
/* Sidebar */
.palette-card{background:var(--white);border-radius:var(--r);box-shadow:var(--shadow);padding:18px;margin-bottom:14px}
.palette-card h3{font-family:'Syne',sans-serif;font-size:0.9rem;font-weight:700;margin-bottom:14px;color:var(--ink)}
.pal-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:5px}
.pb{aspect-ratio:1;border-radius:6px;border:1px solid var(--border);font-family:'IBM Plex Mono',monospace;font-size:0.7rem;font-weight:500;cursor:pointer;background:var(--surface);color:var(--muted);transition:all .12s}
.pb:hover{border-color:var(--accent);color:var(--accent)}
.pb.done{background:var(--accent);color:#fff;border-color:var(--accent)}
.pb.cur{outline:2.5px solid var(--ink);outline-offset:2px}
.legend{margin-top:12px;display:flex;flex-direction:column;gap:6px}
.leg{display:flex;align-items:center;gap:8px;font-size:0.78rem;color:var(--muted)}
.leg-dot{width:12px;height:12px;border-radius:3px;flex-shrink:0}
.prog-wrap{margin-top:12px}
.prog-bg{height:6px;background:var(--surface);border-radius:10px;overflow:hidden;border:1px solid var(--border)}
.prog-fill{height:100%;background:var(--accent);border-radius:10px;transition:width .3s}
.prog-lbl{font-size:0.76rem;color:var(--muted);margin-top:5px;text-align:right}
/* Modal */
.modal-bg{position:fixed;inset:0;background:rgba(13,13,20,0.6);z-index:200;display:none;align-items:center;justify-content:center;backdrop-filter:blur(4px)}
.modal-bg.open{display:flex}
.modal{background:var(--white);border-radius:16px;padding:36px 32px;max-width:420px;width:90%;text-align:center;box-shadow:var(--shadow2)}
.modal h3{font-size:1.3rem;margin-bottom:8px}
.modal p{color:var(--muted);margin-bottom:24px;font-size:0.92rem;line-height:1.6}
.modal-btns{display:flex;gap:10px;justify-content:center}
/* Results */
.res-wrap{max-width:900px;margin:28px auto;padding:0 16px 64px}
.res-hero{background:linear-gradient(135deg,var(--ink) 0%,var(--ink2) 100%);color:#fff;border-radius:20px;padding:40px;text-align:center;margin-bottom:20px;position:relative;overflow:hidden}
.res-hero::before{content:'';position:absolute;top:-60px;right:-60px;width:220px;height:220px;border-radius:50%;background:rgba(124,58,237,.25)}
.sat-score{font-family:'Syne',sans-serif;font-size:4.5rem;font-weight:800;line-height:1;margin-bottom:6px;position:relative}
.score-line{font-size:1.25rem;font-weight:600;margin-bottom:4px;position:relative}
.score-sub{opacity:.7;font-size:0.88rem;position:relative}
.stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:18px}
@media(max-width:580px){.stats-row{grid-template-columns:1fr 1fr}}
.stat-card{background:var(--white);border-radius:var(--r);box-shadow:var(--shadow);padding:20px;text-align:center}
.stat-card .num{font-family:'Syne',sans-serif;font-size:1.9rem;font-weight:800}
.stat-card .lbl{font-size:0.76rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-top:3px}
.stat-card.c .num{color:var(--green)}.stat-card.w .num{color:var(--red)}.stat-card.s .num{color:var(--amber)}
.charts-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:18px}
@media(max-width:580px){.charts-row{grid-template-columns:1fr}}
.chart-card{background:var(--white);border-radius:var(--r);box-shadow:var(--shadow);padding:22px}
.chart-card h3{font-size:0.9rem;font-weight:700;margin-bottom:14px;color:var(--ink)}
.inc-review{background:var(--white);border-radius:var(--r);box-shadow:var(--shadow);padding:24px;margin-bottom:18px}
.inc-review h3{font-size:0.9rem;font-weight:700;color:var(--red);margin-bottom:16px;display:flex;align-items:center;gap:8px;border-bottom:1px solid var(--border);padding-bottom:12px}
.inc-q{border-bottom:1px solid var(--border);padding-bottom:16px;margin-bottom:16px}
.inc-q:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}
.inc-q-text{font-size:0.88rem;font-weight:600;margin-bottom:8px;line-height:1.55;color:var(--ink2);background:var(--surface);padding:10px 12px;border-radius:8px;border-left:3px solid var(--border)}
.inc-row{font-size:0.87rem;display:flex;align-items:flex-start;gap:8px;padding:4px 0}
.inc-row .label{font-weight:600;min-width:110px;flex-shrink:0}
.inc-row.wrong{color:var(--red)}.inc-row.right{color:var(--green)}
.res-actions{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;margin-top:8px}
.saved-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(5,150,105,0.1);border:1px solid rgba(5,150,105,0.3);color:#059669;border-radius:100px;padding:5px 14px;font-size:0.78rem;font-weight:600;margin-top:10px}