:root{
  --bg:#f4f6f8;--card:#fff;--text:#18202a;--muted:#697586;--line:#e4e9ef;
  --primary:#275dff;--primary-soft:#edf2ff;--dark:#18202a;--success:#157f5b;--danger:#c5393d;
  --shadow:0 10px 30px rgba(19,33,68,.07);--radius:16px;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
button,input,select{font:inherit}
button{cursor:pointer}
.auth-locked .topbar,.auth-locked .tabs,.auth-locked .main-shell,.auth-locked .toast{display:none}
.login-screen{display:none;min-height:100vh;place-items:center;padding:24px;background:#eef1f5}
.auth-locked .login-screen{display:grid}
.login-panel{width:min(390px,100%);background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);padding:30px}
.login-brand{display:flex;align-items:center;gap:12px;font-size:15px;font-weight:750}.login-panel h1{font-size:25px;margin:30px 0 22px}.login-panel label,.admin-create-panel label,.password-dialog label{display:block;font-size:12px;color:var(--muted);margin:14px 0}.login-panel input,.admin-create-panel input,.admin-create-panel select,.password-dialog input{display:block;width:100%;margin-top:7px;border:1px solid var(--line);border-radius:8px;padding:10px 11px;color:var(--text);background:#fff}.login-submit{margin-top:22px!important;padding:11px}.form-message{min-height:18px;margin-top:10px;font-size:12px;color:var(--danger)}
.topbar{height:78px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 28px;position:sticky;top:0;z-index:20}
.brand{display:flex;align-items:center;gap:12px}.brand-mark{width:42px;height:42px;border-radius:12px;background:var(--dark);color:#fff;display:grid;place-items:center;font-size:25px;font-weight:700}.brand-title{font-weight:750;font-size:18px}.brand-sub{color:var(--muted);font-size:12px;margin-top:2px}
.topbar-right{display:flex;align-items:center;gap:12px;min-width:0}
.exam-selector{display:flex;align-items:center;gap:7px;font-size:12px;color:var(--muted);white-space:nowrap}.exam-selector select{border:1px solid var(--line);border-radius:8px;padding:8px 28px 8px 9px;background:#fff;color:var(--text);font-weight:700}
.top-stats{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}.stat-chip{background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:7px 11px;font-size:12px;color:var(--muted)}.stat-chip b{color:var(--text);margin-left:4px}
.account-box{position:relative}.account-button{height:38px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:0 11px;font-size:12px;font-weight:700;white-space:nowrap}.account-button::after{content:"▾";color:var(--muted);margin-left:8px}.account-menu{display:none;position:absolute;right:0;top:44px;width:130px;background:#fff;border:1px solid var(--line);border-radius:8px;padding:5px;box-shadow:var(--shadow);z-index:30}.account-menu.open{display:block}.account-menu button{display:block;width:100%;border:0;background:#fff;text-align:left;border-radius:6px;padding:8px 9px;font-size:12px}.account-menu button:hover{background:var(--bg)}
body:not(.is-admin) .admin-only{display:none}
.tabs{height:52px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:end;padding-left:28px;gap:6px;position:sticky;top:78px;z-index:19}.tab{height:44px;border:0;background:transparent;padding:0 16px;color:var(--muted);border-bottom:3px solid transparent;font-weight:650}.tab.active{color:var(--primary);border-bottom-color:var(--primary)}.badge{display:inline-grid;place-items:center;min-width:20px;height:20px;border-radius:10px;background:var(--primary-soft);color:var(--primary);font-size:11px;margin-left:4px;padding:0 5px}
.main-shell{padding:24px 28px 50px;max-width:1600px;margin:0 auto}.view{display:none}.view.active{display:block}
#view-bank.active{display:grid;grid-template-columns:250px minmax(0,1fr);gap:20px}.filter-panel,.content-panel,.paper-main,.paper-summary,.auto-card,.coverage-card,.history-list-panel,.history-detail{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.filter-panel{padding:18px;align-self:start;position:sticky;top:148px}.panel-title{font-weight:760;margin-bottom:15px;font-size:16px}.filter-panel label,.paper-title-row label{display:block;font-size:12px;color:var(--muted);margin:11px 0}.filter-panel select,.filter-panel input,.paper-title-row input{width:100%;margin-top:6px;border:1px solid var(--line);border-radius:9px;padding:9px 10px;background:#fff;color:var(--text)}
.filter-flags{padding:6px 0}.checkline{display:flex!important;gap:8px;align-items:center;margin:9px 0!important;color:var(--text)!important;font-size:13px!important}.checkline input{width:auto!important;margin:0!important}.muted{color:var(--muted)!important}
.btn{border:1px solid var(--line);background:#fff;color:var(--text);padding:9px 13px;border-radius:9px;font-weight:650}.btn:hover{filter:brightness(.98)}.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn.dark{background:var(--dark);border-color:var(--dark);color:#fff}.btn.ghost{background:#fff}.btn.danger{color:var(--danger);border-color:#f0c7c9}.btn.full{width:100%;margin-top:8px}.btn.large{padding:12px 20px;font-size:15px}.btn.tiny{padding:5px 8px;font-size:12px;border-radius:7px}
.hint-box{font-size:12px;line-height:1.65;color:var(--muted);background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:11px;margin-top:14px}.hint-box strong{color:var(--text)}
.content-panel{padding:20px;min-width:0}.content-head,.section-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:18px}.content-head h2,.section-heading h2{margin:0;font-size:21px}.content-head p,.section-heading p{margin:5px 0 0;color:var(--muted);font-size:13px}
.question-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(310px,1fr));gap:14px;margin-top:18px}.q-card{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff;display:flex;flex-direction:column}.q-card:hover{border-color:#cbd5e1;box-shadow:0 8px 20px rgba(15,23,42,.06)}.q-card-top{padding:12px 13px 8px;display:flex;justify-content:space-between;gap:8px}.q-tags{display:flex;gap:6px;flex-wrap:wrap}.tag{font-size:11px;padding:4px 7px;border-radius:7px;background:#f2f4f7;color:#4b5563}.tag.bank{background:var(--primary-soft);color:var(--primary)}.tag.wrong{background:#fff0f0;color:var(--danger)}.tag.star{background:#fff8df;color:#956c00}.q-id{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:#98a2b3;font-size:10px;white-space:nowrap}.q-image-wrap{margin:0 12px;background:#fbfcfd;border:1px solid var(--line);border-radius:9px;min-height:118px;display:flex;align-items:center;justify-content:center;overflow:hidden}.q-image{width:100%;height:auto;display:block;max-height:330px;object-fit:contain;background:white}.image-placeholder{padding:24px;text-align:center;color:#98a2b3;font-size:12px;line-height:1.6}.q-meta{padding:10px 13px;font-size:12px;line-height:1.55;color:var(--muted);min-height:66px}.q-meta b{color:var(--text)}.q-actions{border-top:1px solid var(--line);padding:9px 11px;display:flex;gap:7px;justify-content:flex-end;margin-top:auto}.icon-btn{border:1px solid var(--line);background:#fff;border-radius:8px;padding:6px 9px;font-size:12px}.icon-btn.active-star{background:#fff7db;border-color:#ecd47a}.icon-btn.active-wrong{background:#fff0f0;border-color:#f0c7c9;color:var(--danger)}
.pager{display:flex;align-items:center;gap:7px}.pager.bottom{justify-content:center;margin-top:20px}.pager button{border:1px solid var(--line);background:#fff;border-radius:8px;padding:6px 9px}.pager button:disabled{opacity:.4;cursor:not-allowed}.pager span{font-size:12px;color:var(--muted)}
.paper-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:20px}.paper-main{padding:22px}.paper-summary{padding:18px;align-self:start;position:sticky;top:148px}.paper-actions{display:flex;gap:8px}.paper-title-row{display:flex;align-items:end;gap:12px;border-top:1px solid var(--line);margin-top:18px;padding-top:14px}.paper-title-row label{flex:1;margin:0}.status-pill{font-size:11px;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:6px 9px;margin-bottom:1px}.paper-sections{margin-top:18px}.paper-section{border-top:1px solid var(--line);padding-top:16px;margin-top:18px}.paper-section:first-child{border-top:0;margin-top:0}.paper-section h3{font-size:16px;margin:0 0 10px}.paper-item{display:grid;grid-template-columns:34px minmax(0,1fr) auto;gap:10px;padding:10px 0;border-top:1px dashed var(--line)}.paper-item:first-of-type{border-top:0}.paper-num{width:30px;height:30px;border-radius:8px;background:#f2f4f7;display:grid;place-items:center;font-size:12px;font-weight:700}.paper-item-meta{font-size:12px;color:var(--muted);line-height:1.55}.paper-item-meta b{color:var(--text)}.paper-item-actions{display:flex;gap:5px;align-items:flex-start}.summary-title{font-weight:750;margin-bottom:12px}.summary-row{display:flex;justify-content:space-between;padding:8px 0;border-top:1px solid var(--line);font-size:12px}.summary-row:first-of-type{border-top:0}.summary-row span{color:var(--muted)}.coverage-mini{margin-top:15px}.coverage-mini .mini-ch{font-size:11px;padding:5px 7px;background:#f6f7f9;border-radius:6px;margin:4px 0}.coverage-mini .covered{background:#ecf9f3;color:var(--success)}.coverage-mini .missing{background:#fff3f3;color:var(--danger)}
.auto-shell{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:20px}.auto-card,.coverage-card{padding:22px}.rule-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:20px 0}.rule-strip div{border:1px solid var(--line);background:#fafbfc;border-radius:12px;padding:13px}.rule-strip b{display:block;font-size:14px}.rule-strip span{display:block;font-size:12px;color:var(--muted);margin-top:4px}.auto-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:14px 0 18px}.auto-grid fieldset{border:1px solid var(--line);border-radius:12px;padding:13px 15px}.auto-grid legend{font-weight:700;font-size:13px;padding:0 5px}.microcopy{font-size:11px;line-height:1.5;color:var(--muted)}.auto-actions{display:flex;align-items:center;justify-content:space-between;gap:14px}.auto-used-status{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:12px}.auto-used-status .btn{white-space:nowrap}.auto-used-status .btn:disabled{opacity:.45;cursor:not-allowed}.auto-message{margin-top:15px;font-size:13px;line-height:1.6}.auto-message.success{background:#ecf9f3;color:#106948;border:1px solid #bfe9d7;border-radius:10px;padding:12px}.auto-message.error{background:#fff3f3;color:#a22d32;border:1px solid #f0c7c9;border-radius:10px;padding:12px}.coverage-card h3{margin:0 0 14px}.coverage-group{margin:14px 0}.coverage-group b{font-size:13px}.coverage-list-item{display:flex;gap:9px;align-items:center;padding:8px 0;border-top:1px solid var(--line);font-size:12px}.coverage-code{font-family:ui-monospace,monospace;color:var(--primary);min-width:40px}
.history-layout{display:grid;grid-template-columns:430px minmax(0,1fr);gap:20px}.history-list-panel,.history-detail{padding:20px;min-height:540px}.history-card{border:1px solid var(--line);border-radius:12px;padding:12px;margin-top:10px}.history-card.active{border-color:#9db4ff;background:#f8faff}.history-title{font-weight:700;font-size:14px}.history-meta{font-size:11px;color:var(--muted);margin-top:4px}.history-actions{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}.history-q{border-top:1px solid var(--line);padding:12px 0}.history-q:first-child{border-top:0}.history-q-head{display:flex;justify-content:space-between;gap:10px}.history-q-meta{font-size:12px;color:var(--muted);line-height:1.5}.history-q-meta b{color:var(--text)}
.admin-layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:20px}.admin-create-panel,.admin-users-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;align-self:start}.user-table-wrap{overflow-x:auto;margin-top:14px}.user-table{width:100%;border-collapse:collapse;min-width:760px}.user-table th,.user-table td{text-align:left;border-top:1px solid var(--line);padding:10px 8px;font-size:12px;vertical-align:middle}.user-table th{color:var(--muted);font-weight:650}.user-table input,.user-table select{border:1px solid var(--line);border-radius:7px;padding:7px 8px;background:#fff;max-width:145px}.user-table .user-data{color:var(--muted);line-height:1.5;white-space:nowrap}.user-table .self-label{font-size:10px;color:var(--primary);margin-left:5px}.active-switch{display:flex;align-items:center;gap:6px;white-space:nowrap}.password-dialog{width:min(410px,calc(100% - 32px));border:1px solid var(--line);border-radius:10px;padding:22px;box-shadow:0 24px 70px rgba(15,23,42,.2)}.password-dialog::backdrop{background:rgba(15,23,42,.4)}.dialog-head{display:flex;align-items:center;justify-content:space-between}.dialog-head h2{font-size:19px;margin:0}.dialog-close{border:0;background:transparent;font-size:24px;line-height:1;color:var(--muted);padding:4px}.dialog-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:20px}
.empty-state{padding:40px 20px;text-align:center;color:#98a2b3;font-size:13px;border:1px dashed var(--line);border-radius:12px}.toast{position:fixed;right:24px;bottom:24px;background:#18202a;color:#fff;padding:11px 14px;border-radius:10px;box-shadow:var(--shadow);font-size:13px;opacity:0;transform:translateY(8px);pointer-events:none;transition:.2s;z-index:40}.toast.show{opacity:1;transform:none}
@media(max-width:1000px){#view-bank.active,.paper-layout,.auto-shell,.history-layout,.admin-layout{grid-template-columns:1fr}.filter-panel,.paper-summary{position:static}.auto-grid,.rule-strip{grid-template-columns:1fr}.top-stats{display:none}.tabs{overflow-x:auto;padding-left:12px}.main-shell{padding:16px}.topbar{padding:0 16px}.paper-actions{flex-wrap:wrap;justify-content:flex-end}}
@media(max-width:560px){.brand-sub{display:none}.brand{gap:7px}.brand-mark{width:36px;height:36px}.brand-title{width:76px;font-size:13px;line-height:1.25}.topbar{height:68px;padding:0 8px}.topbar-right{gap:6px}.tabs{top:68px}.account-button{max-width:104px;overflow:hidden;text-overflow:ellipsis}.paper-title-row,.section-heading{align-items:stretch;flex-direction:column}.paper-actions{justify-content:flex-start}.auto-actions,.auto-used-status{align-items:stretch;flex-direction:column}.auto-actions .btn,.auto-used-status .btn{width:100%}.question-grid{grid-template-columns:1fr}.login-panel{padding:24px}}

.orientation-control{max-width:130px}.orientation-control select,.orientation-inline select{display:block;margin-top:6px;border:1px solid var(--line);border-radius:8px;padding:8px;background:#fff;color:var(--text)}
.mode-strip{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:18px 0;padding:10px 12px;background:#f8fafc;border:1px solid var(--line);border-radius:10px}.mode-strip label{display:flex;align-items:center;gap:7px;padding:7px 10px;border:1px solid var(--line);border-radius:8px;background:#fff;font-size:13px}.mode-strip label span{font-size:11px;color:var(--muted)}.mode-strip .orientation-inline{margin-left:auto}
.mode-strip[hidden],.math-only[hidden],.signal-only[hidden],.signal-bank-options[hidden]{display:none!important}.tag.intensive{background:#fff2e8;color:#9a3412}.signal-range{margin:0 0 18px;padding:14px;border:1px solid var(--line);background:#fafbfc;border-radius:8px}.signal-chapter-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 14px;margin-top:12px;padding-top:12px;border-top:1px solid var(--line)}.signal-topic-group{display:grid;gap:7px;align-content:start;min-width:0;border:1px solid var(--line);border-radius:6px;padding:9px 10px}.signal-topic-group legend{padding:0 5px;font-size:11px;font-weight:700;color:#455566}.signal-chapter-options .checkline{margin:0;min-width:0;align-items:flex-start}.signal-chapter-options span{line-height:1.4}.signal-custom{margin:0 0 16px}.signal-custom fieldset{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;border:1px solid var(--line);padding:12px}.signal-custom legend{font-size:12px;font-weight:700;padding:0 5px}.signal-custom legend span{color:var(--success);margin-left:6px}.signal-custom legend .invalid-total{color:var(--danger)}.signal-custom label{display:grid;gap:5px;font-size:11px;color:var(--muted)}.signal-custom input{width:100%;min-width:0;border:1px solid var(--line);border-radius:7px;padding:8px;background:#fff}.signal-notices{margin-top:18px;padding:15px;border:1px solid #d9e2ea;border-left:3px solid #4b6478;background:#f8fafb;border-radius:6px}.signal-notices h3{font-size:14px;margin:0 0 10px}.signal-notices p{font-size:12px;line-height:1.65;margin:5px 0;color:#455566}.signal-notices p span{color:var(--muted)}
.choice-fill-panel{margin:-8px 0 18px;padding:4px 0 16px;border-bottom:1px solid var(--line)}.choice-fill-panel[hidden],.custom-allocation[hidden]{display:none}.submode-strip{display:flex;gap:8px;flex-wrap:wrap}.submode-strip label{display:flex;align-items:center;gap:7px;padding:8px 11px;border:1px solid var(--line);border-radius:8px;background:#fff;font-size:13px}.custom-allocation{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px}.custom-allocation fieldset{display:grid;grid-template-columns:1fr 1fr;gap:10px;border:1px solid var(--line);padding:11px 12px}.custom-allocation legend{font-size:12px;font-weight:700;padding:0 5px}.custom-allocation legend span{color:var(--success);margin-left:5px}.custom-allocation legend .invalid-total{color:var(--danger)}.custom-allocation label{display:grid;grid-template-columns:auto 72px;align-items:center;gap:8px;font-size:12px;color:var(--muted)}.custom-allocation input{width:72px;border:1px solid var(--line);border-radius:7px;padding:7px 8px;background:#fff;color:var(--text)}
.math1-allocation{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:0 0 18px}.math1-allocation[hidden],.math1-bank-options[hidden],.math2-bank-options[hidden],#math1SolutionAllocation[hidden]{display:none}.math1-allocation fieldset{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;border:1px solid var(--line);padding:11px 12px}.math1-allocation legend{font-size:12px;font-weight:700;padding:0 5px}.math1-allocation legend span{color:var(--success);margin-left:5px}.math1-allocation legend .invalid-total{color:var(--danger)}.math1-allocation label{display:grid;gap:5px;font-size:11px;color:var(--muted)}.math1-allocation input{width:100%;min-width:0;border:1px solid var(--line);border-radius:7px;padding:7px 8px;background:#fff;color:var(--text)}
.history-wrong-toolbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:14px;padding:10px 12px;background:#f8fafc;border:1px solid var(--line);border-radius:9px;font-size:12px}.history-wrong-toolbar .btn{margin-left:auto}.history-q-head{align-items:center}.history-q-meta{display:flex;gap:9px;align-items:flex-start}.history-q-select{margin-top:3px;width:16px;height:16px;flex:none}.wrong-badge{font-size:11px;color:var(--danger);background:#fff0f0;border:1px solid #f0c7c9;border-radius:6px;padding:4px 7px;white-space:nowrap}
@media(max-width:1000px){.math1-allocation{grid-template-columns:1fr}}
@media(max-width:560px){.orientation-control{max-width:none}.mode-strip .orientation-inline{margin-left:0}.mode-strip label{width:100%;justify-content:space-between}.submode-strip label{flex:1 1 calc(50% - 4px)}.custom-allocation{grid-template-columns:1fr}.math1-allocation fieldset,.signal-custom fieldset{grid-template-columns:repeat(3,minmax(0,1fr))}.signal-chapter-options{grid-template-columns:1fr}.exam-selector{font-size:0}.exam-selector select{width:104px;font-size:12px;padding:8px 22px 8px 7px}.history-actions .btn{flex:1 1 calc(50% - 3px)}.history-wrong-toolbar .btn{width:100%;margin-left:0}}