:root{--ink:#172033;--muted:#64748b;--paper:#fffdf7;--panel:#fff;--violet:#6d3ee8;--violet-dark:#4d26b7;--gold:#f3b72b;--mint:#20b486;--line:#e8e2f0;--danger:#c43b5a;--shadow:0 18px 55px rgba(62,40,105,.12);--radius:22px}
*{box-sizing:border-box}html{background:#f6f2fb;color:var(--ink);font-family:Inter,"Microsoft YaHei",system-ui,sans-serif}body{margin:0;min-height:100vh;background:radial-gradient(circle at 5% 2%,#f0e8ff 0,transparent 28rem),radial-gradient(circle at 96% 9%,#fff0bc 0,transparent 26rem),#faf8fd}button,input,select,textarea{font:inherit}button{cursor:pointer}.shell{width:min(1160px,calc(100% - 32px));margin:auto}.topbar{display:flex;align-items:center;justify-content:space-between;padding:22px 0}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none}.brand-mark{width:42px;height:42px;border-radius:14px;background:var(--violet);color:#fff;display:grid;place-items:center;font-weight:900;box-shadow:0 8px 24px #6d3ee84d}.brand strong{display:block;font-size:1.05rem}.brand span{display:block;color:var(--muted);font-size:.76rem;margin-top:2px}.top-actions{display:flex;align-items:center;gap:10px}.hero{min-height:calc(100vh - 96px);display:grid;grid-template-columns:1.06fr .94fr;gap:clamp(32px,7vw,90px);align-items:center;padding:40px 0 90px}.eyebrow{color:var(--violet);font-weight:850;letter-spacing:.12em;font-size:.77rem;text-transform:uppercase}.hero h1{font-family:Georgia,"Noto Serif SC",serif;font-size:clamp(2.6rem,5vw,5.2rem);line-height:1.02;letter-spacing:-.045em;margin:14px 0 22px;max-width:760px}.hero h1 em{font-style:normal;color:var(--violet)}.lead{font-size:1.04rem;color:#526078;line-height:1.8;max-width:640px}.trust{display:flex;gap:24px;flex-wrap:wrap;margin-top:32px;color:#46536b;font-size:.9rem}.trust span:before{content:"✓";display:inline-grid;place-items:center;width:21px;height:21px;border-radius:50%;margin-right:7px;background:#dff8ef;color:#087a59;font-weight:900}.card{background:rgba(255,255,255,.92);border:1px solid rgba(255,255,255,.8);border-radius:var(--radius);box-shadow:var(--shadow);padding:clamp(24px,4vw,42px);backdrop-filter:blur(12px)}.card h2{font-family:Georgia,"Noto Serif SC",serif;margin:0 0 8px;font-size:1.75rem}.sub{color:var(--muted);font-size:.9rem;line-height:1.6}.form{display:grid;gap:16px;margin-top:26px}.field{display:grid;gap:7px}.field label{font-size:.86rem;font-weight:760;color:#3b465b}.field input,.field select,.field textarea{width:100%;border:1px solid #dcd5e7;background:#fff;border-radius:13px;padding:13px 14px;color:var(--ink);outline:none;transition:.18s}.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--violet);box-shadow:0 0 0 4px #6d3ee817}.field textarea{resize:vertical;min-height:100px}.two{display:grid;grid-template-columns:1fr 1fr;gap:13px}.btn{border:0;border-radius:13px;padding:12px 18px;font-weight:800;transition:transform .15s,box-shadow .15s,background .15s;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn:hover{transform:translateY(-1px)}.btn-primary{background:var(--violet);color:#fff;box-shadow:0 10px 24px #6d3ee838}.btn-primary:hover{background:var(--violet-dark)}.btn-soft{background:#eee8ff;color:var(--violet-dark)}.btn-ghost{background:#fff;border:1px solid var(--line);color:#364155}.btn-danger{background:#fff0f3;color:var(--danger)}.btn-block{width:100%;padding:14px}.message{display:none;border-radius:12px;padding:11px 13px;font-size:.87rem;line-height:1.5}.message.show{display:block}.message.error{background:#fff0f3;color:#9e2946}.message.ok{background:#e5f8f1;color:#087a59}.admin-main{padding:28px 0 80px}.admin-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin:22px 0 28px}.admin-head h1{font-family:Georgia,"Noto Serif SC",serif;font-size:clamp(2rem,4vw,3.5rem);margin:5px 0}.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:18px}.metric{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px}.metric b{display:block;font-size:1.75rem;margin-top:5px}.metric span{font-size:.8rem;color:var(--muted)}.dashboard{display:grid;grid-template-columns:330px 1fr;gap:18px;align-items:start}.dashboard .card{padding:24px;border:1px solid var(--line);box-shadow:0 12px 36px rgba(62,40,105,.08)}.code-reveal{background:#20153d;color:#fff;border-radius:16px;padding:18px;margin-top:18px}.code-reveal .code{font:900 1.65rem ui-monospace,Consolas,monospace;letter-spacing:.16em;color:#ffd76d;margin:8px 0}.table-wrap{overflow:auto}.table{width:100%;border-collapse:collapse;min-width:720px}.table th{text-align:left;color:var(--muted);font-size:.75rem;letter-spacing:.04em;padding:11px;border-bottom:1px solid var(--line)}.table td{padding:14px 11px;border-bottom:1px solid #eeeaf3;font-size:.87rem;vertical-align:middle}.table tr:hover td{background:#fcfaff}.name{font-weight:800}.mono{font-family:ui-monospace,Consolas,monospace}.pill{display:inline-flex;border-radius:99px;padding:5px 9px;font-size:.72rem;font-weight:800}.pill.unused{background:#eee8ff;color:#5733bb}.pill.in_progress{background:#fff2c8;color:#8a5d00}.pill.submitted{background:#ddf7ee;color:#08765a}.pill.expired,.pill.cancelled{background:#eef0f4;color:#697386}.empty{padding:50px 20px;text-align:center;color:var(--muted)}.detail{display:none}.detail.show{display:block}.detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.answer-box{background:#faf8fd;border:1px solid var(--line);border-radius:15px;padding:16px;max-height:300px;overflow:auto}.answer-list{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;font-size:.79rem}.answer-list span{background:#fff;border:1px solid #e8e2f0;padding:7px;border-radius:8px}.score{font-size:2rem;font-weight:900;color:var(--violet)}.login-wrap{width:min(460px,calc(100% - 32px));margin:8vh auto}.login-wrap .brand{justify-content:center;margin-bottom:28px}.hidden{display:none!important}.muted{color:var(--muted)}.small{font-size:.8rem}
.paper-library{margin-top:24px;padding:28px!important;border:1px solid var(--line)!important;box-shadow:0 12px 36px rgba(62,40,105,.08)!important;scroll-margin-top:18px}.library-head{display:flex;align-items:start;justify-content:space-between;gap:20px}.library-head h2{margin:5px 0 6px}.paper-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:22px}.paper-tile{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:17px;padding:18px;background:#fff}.paper-tile:before{content:"";position:absolute;left:0;top:0;bottom:0;width:5px;background:var(--course-color,var(--violet))}.paper-tile.basic{--course-color:#20b486}.paper-tile.advanced{--course-color:#6d3ee8}.paper-tile.pet{--course-color:#f3b72b}.paper-course{font-size:.73rem;font-weight:850;letter-spacing:.08em;color:var(--muted)}.paper-name{font-weight:850;margin:8px 0 3px}.paper-version{font-family:ui-monospace,Consolas,monospace;color:var(--violet);font-size:.82rem}.paper-foot{display:flex;justify-content:space-between;align-items:center;margin-top:15px}.paper-form{border-top:1px solid var(--line);margin-top:24px;padding-top:22px}.draft-note{background:#fff7dc;color:#765400;border-radius:12px;padding:12px 14px;font-size:.84rem;line-height:1.6}
@media(max-width:850px){.hero{grid-template-columns:1fr;padding-top:25px}.hero-copy{text-align:center}.lead{margin-inline:auto}.trust{justify-content:center}.metrics{grid-template-columns:1fr 1fr}.dashboard{grid-template-columns:1fr}.detail-grid{grid-template-columns:1fr}.admin-head,.library-head{align-items:start;flex-direction:column}.paper-grid{grid-template-columns:1fr}.top-actions .label{display:none}}
@media(max-width:520px){.shell{width:min(100% - 22px,1160px)}.topbar{padding:14px 0}.hero h1{font-size:2.55rem}.card{padding:22px}.two{grid-template-columns:1fr}.metrics{grid-template-columns:1fr 1fr;gap:8px}.metric{padding:14px}.answer-list{grid-template-columns:repeat(2,1fr)}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}