:root{
  --paper:#F7F3E8;
  --paper-line:#E7DFC7;
  --margin-red:#C8827A;
  --ink:#1C2740;
  --ink-soft:#5B6478;
  --navy:#1C2740;
  --navy-light:#2B3A63;
  --red:#B23A32;
  --red-soft:#F3DFDB;
  --green:#3F7D58;
  --green-soft:#DEEBE1;
  --amber:#C6862E;
  --amber-soft:#F3E6D0;
  --white:#FFFFFF;
  --border:#DCD3B2;
  --shadow:0 2px 10px rgba(28,39,64,0.08);
  --shadow-lg:0 8px 28px rgba(28,39,64,0.14);
  --radius:10px;
  --font-display:'Fraunces',serif;
  --font-body:'Inter',sans-serif;
  --font-mono:'IBM Plex Mono',monospace;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  min-height:100vh;
  background-image:repeating-linear-gradient(var(--paper) 0px, var(--paper) 27px, var(--paper-line) 28px);
}
#app{min-height:100vh;}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:600;margin:0;color:var(--navy);}
button{font-family:var(--font-body);cursor:pointer;}
input,select,textarea{font-family:var(--font-body);}
a{color:inherit;}
::selection{background:var(--amber-soft);}
:focus-visible{outline:2px solid var(--navy);outline-offset:2px;}

/* ---------- Login ---------- */
.login-wrap{display:flex;min-height:100vh;}
.login-hero{
  flex:1.1;
  background:var(--navy);
  color:#F3EFE2;
  display:flex;flex-direction:column;justify-content:center;
  padding:64px;position:relative;overflow:hidden;
}
.login-hero::before{
  content:"";position:absolute;top:0;bottom:0;left:88px;width:2px;background:var(--margin-red);opacity:.55;
}
.login-hero .eyebrow{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:#D8B37A;margin-bottom:18px;
}
.login-hero h1{color:#F3EFE2;font-size:clamp(34px,4.2vw,54px);line-height:1.08;max-width:9.5em;}
.login-hero p{font-size:16px;line-height:1.6;color:#C4CAE0;max-width:34em;margin-top:22px;}
.login-stamp{
  margin-top:42px;display:inline-flex;align-items:center;gap:12px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:#9FA9C6;
}
.login-stamp .dot{width:7px;height:7px;border-radius:50%;background:var(--green);}
.login-side{
  flex:1;display:flex;align-items:center;justify-content:center;padding:40px;
}
.login-card{
  width:100%;max-width:380px;background:var(--white);border:1px solid var(--border);
  border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:36px;
}
.role-toggle{display:flex;background:var(--paper);border:1px solid var(--border);border-radius:8px;padding:4px;margin-bottom:26px;}
.role-toggle button{
  flex:1;background:none;border:none;padding:9px 0;border-radius:6px;font-weight:600;font-size:13.5px;color:var(--ink-soft);transition:.15s;
}
.role-toggle button.active{background:var(--navy);color:#fff;}
.field{margin-bottom:16px;}
.field label{display:block;font-size:12.5px;font-weight:600;color:var(--ink-soft);margin-bottom:6px;letter-spacing:.02em;}
.field input,.field select{
  width:100%;padding:11px 12px;border:1px solid var(--border);border-radius:7px;font-size:14.5px;background:var(--paper);color:var(--ink);
}
.field input:focus,.field select:focus{background:var(--white);}
.field select:disabled{opacity:.6;}
.role-toggle button{white-space:nowrap;padding:9px 6px;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 18px;border-radius:7px;border:none;font-weight:600;font-size:14px;transition:.15s;
}
.btn-primary{background:var(--navy);color:#fff;width:100%;}
.btn-primary:hover{background:var(--navy-light);}
.btn-secondary{background:var(--paper);color:var(--ink);border:1px solid var(--border);}
.btn-secondary:hover{background:var(--white);}
.btn-danger{background:var(--red-soft);color:var(--red);}
.btn-danger:hover{background:#ecc9c4;}
.btn-ghost{background:none;color:var(--ink-soft);border:1px solid var(--border);}
.btn-ghost:hover{color:var(--ink);}
.btn-sm{padding:7px 12px;font-size:12.5px;width:auto;}
.btn:disabled{opacity:.5;cursor:not-allowed;}
.hint{font-size:12px;color:var(--ink-soft);margin-top:14px;text-align:center;}
.hint code{background:var(--paper);padding:2px 6px;border-radius:4px;font-family:var(--font-mono);}
.error-box{background:var(--red-soft);color:var(--red);font-size:13px;padding:10px 12px;border-radius:7px;margin-bottom:16px;font-weight:500;}

/* ---------- Shell ---------- */
.shell{min-height:100vh;display:flex;}
.sidebar{
  width:216px;background:var(--navy);color:#F3EFE2;padding:26px 16px;display:flex;flex-direction:column;flex-shrink:0;
}
.brand{font-family:var(--font-display);font-size:19px;color:#fff;padding:0 10px 22px;border-bottom:1px solid rgba(255,255,255,.12);margin-bottom:18px;}
.brand span{display:block;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;color:#D8B37A;text-transform:uppercase;margin-top:5px;}
.nav-item{
  display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:7px;color:#C4CAE0;font-size:13.5px;font-weight:500;margin-bottom:2px;background:none;border:none;width:100%;text-align:left;
}
.nav-item:hover{background:rgba(255,255,255,.06);color:#fff;}
.nav-item.active{background:rgba(255,255,255,.13);color:#fff;}
.sidebar-foot{margin-top:auto;padding-top:16px;border-top:1px solid rgba(255,255,255,.12);}
.who{font-size:12.5px;color:#9FA9C6;margin-bottom:10px;padding:0 2px;}
.who b{color:#F3EFE2;display:block;font-size:13.5px;}
.main{flex:1;padding:36px 44px;max-width:1080px;}
.page-head{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:26px;flex-wrap:wrap;gap:14px;}
.page-head p{color:var(--ink-soft);font-size:14px;margin-top:6px;}

.card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px;margin-bottom:20px;}
.card h3{font-size:17px;margin-bottom:4px;}
.type-pick-card{cursor:pointer;transition:.15s;}
.type-pick-card:hover{border-color:var(--navy);box-shadow:var(--shadow-lg);transform:translateY(-2px);}
.row{display:flex;gap:14px;flex-wrap:wrap;align-items:flex-end;}
.row .field{flex:1;min-width:160px;}

table{width:100%;border-collapse:collapse;font-size:13.5px;}
th{text-align:left;font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-soft);padding:8px 10px;border-bottom:1px solid var(--border);}
td{padding:11px 10px;border-bottom:1px solid var(--paper-line);vertical-align:middle;}
tr:last-child td{border-bottom:none;}
.empty-state{text-align:center;padding:50px 20px;color:var(--ink-soft);}
.empty-state h4{color:var(--ink);margin-bottom:6px;}

.badge{display:inline-flex;align-items:center;gap:5px;font-size:11px;font-weight:600;padding:3px 9px;border-radius:100px;letter-spacing:.02em;}
.badge-green{background:var(--green-soft);color:var(--green);}
.badge-amber{background:var(--amber-soft);color:var(--amber);}
.badge-red{background:var(--red-soft);color:var(--red);}
.badge-navy{background:#E4E7F0;color:var(--navy);}

/* Question builder */
.q-block{border:1px solid var(--border);border-radius:8px;padding:18px;margin-bottom:14px;background:var(--paper);position:relative;}
.q-block .q-num{font-family:var(--font-mono);font-size:11px;color:var(--amber);font-weight:600;margin-bottom:8px;letter-spacing:.06em;}
.opt-row{display:flex;align-items:center;gap:10px;margin-bottom:8px;}
.opt-row input[type=radio]{accent-color:var(--green);width:16px;height:16px;flex-shrink:0;}
.opt-row input[type=text]{flex:1;}
.remove-q{position:absolute;top:14px;right:14px;background:none;border:none;color:var(--ink-soft);font-size:16px;}
.remove-q:hover{color:var(--red);}
.toggle-line{display:flex;align-items:center;gap:10px;}
.switch{position:relative;width:38px;height:22px;background:var(--border);border-radius:100px;transition:.15s;flex-shrink:0;cursor:pointer;}
.switch.on{background:var(--green);}
.switch::after{content:"";position:absolute;top:2px;left:2px;width:18px;height:18px;background:#fff;border-radius:50%;transition:.15s;}
.switch.on::after{left:18px;}

/* Timer & test taking */
.test-header{display:flex;justify-content:space-between;align-items:center;background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:16px 22px;margin-bottom:20px;box-shadow:var(--shadow);}
.timer-badge{font-family:var(--font-mono);font-size:22px;font-weight:600;color:var(--navy);background:var(--paper);border:1px solid var(--border);padding:8px 16px;border-radius:8px;letter-spacing:.02em;}
.timer-badge.urgent{color:var(--red);background:var(--red-soft);border-color:var(--red);animation:pulse 1s infinite;}
@keyframes pulse{0%,100%{opacity:1;}50%{opacity:.55;}}
.q-nav-grid{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:20px;}
.q-nav-dot{
  width:34px;height:34px;border-radius:7px;border:1px solid var(--border);background:var(--white);
  font-family:var(--font-mono);font-size:12.5px;font-weight:600;color:var(--ink-soft);
}
.q-nav-dot.answered{background:var(--navy);color:#fff;border-color:var(--navy);}
.q-nav-dot.current{border:2px solid var(--amber);color:var(--amber);}
.q-nav-dot.locked{background:var(--ink-soft);color:#fff;border-color:var(--ink-soft);opacity:.75;}
.test-q-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow);}
.test-q-card .q-eyebrow{font-family:var(--font-mono);font-size:11.5px;color:var(--amber);letter-spacing:.08em;margin-bottom:10px;}
.test-q-card .q-text{font-size:18px;line-height:1.5;margin-bottom:22px;color:var(--ink);font-weight:500;}
.opt-choice{display:flex;align-items:center;gap:12px;padding:13px 16px;border:1px solid var(--border);border-radius:8px;margin-bottom:10px;background:var(--paper);cursor:pointer;}
.opt-choice.disabled{cursor:not-allowed;opacity:.6;}
.opt-choice:hover{border-color:var(--navy);}
.opt-choice.selected{border-color:var(--navy);background:#E4E7F0;}
.opt-choice input{accent-color:var(--navy);width:17px;height:17px;flex-shrink:0;}
.opt-choice label{flex:1;font-size:14.5px;cursor:pointer;}
.text-answer-box{width:100%;min-height:180px;padding:14px 16px;border:1px solid var(--border);border-radius:8px;font-size:14.5px;line-height:1.6;background:var(--paper);resize:vertical;}
.text-answer-box:focus{background:var(--white);}
.test-footer{display:flex;justify-content:space-between;margin-top:22px;}

/* Result / stamp */
.result-wrap{display:flex;gap:26px;flex-wrap:wrap;}
.stamp-card{
  flex:0 0 240px;background:var(--white);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-lg);
  padding:30px 20px;text-align:center;position:relative;
}
.stamp-ring{
  width:130px;height:130px;border-radius:50%;border:4px solid var(--green);color:var(--green);
  display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0 auto 16px;
  transform:rotate(-6deg);font-family:var(--font-display);
}
.stamp-ring.fail{border-color:var(--red);color:var(--red);}
.stamp-ring.pending{border-color:var(--amber);color:var(--amber);}
.stamp-ring .pct{font-size:30px;font-weight:700;line-height:1;}
.stamp-ring .pct-label{font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;margin-top:2px;}
.stat-grid{flex:1;min-width:260px;display:grid;grid-template-columns:1fr 1fr;gap:14px;}
.stat-box{background:var(--white);border:1px solid var(--border);border-radius:8px;padding:16px 18px;}
.stat-box .num{font-family:var(--font-mono);font-size:24px;font-weight:600;color:var(--navy);}
.stat-box .lbl{font-size:12px;color:var(--ink-soft);margin-top:2px;}
.stat-box.green .num{color:var(--green);}
.stat-box.red .num{color:var(--red);}
.stat-box.amber .num{color:var(--amber);}

.modal-backdrop{position:fixed;inset:0;background:rgba(28,39,64,.45);display:flex;align-items:center;justify-content:center;z-index:50;padding:20px;}
.modal-card{background:var(--white);border-radius:var(--radius);padding:26px;max-width:400px;width:100%;box-shadow:var(--shadow-lg);}
.modal-card h3{margin-bottom:10px;}
.modal-card p{font-size:14px;color:var(--ink-soft);line-height:1.5;margin-bottom:8px;}

.inline-edit{display:flex;gap:8px;align-items:center;}
.inline-edit input{padding:6px 8px;border:1px solid var(--border);border-radius:5px;font-size:13px;width:120px;}

/* ---------- Coding questions (teacher builder + student editor) ---------- */
.code-textarea{
  width:100%;min-height:80px;padding:11px 12px;border:1px solid var(--border);border-radius:7px;
  font-family:var(--font-mono);font-size:13px;background:var(--paper);color:var(--ink);resize:vertical;
}
.code-textarea:focus{background:var(--white);}
.code-textarea.hidden{display:none;}
.code-starter-tabs{display:flex;gap:6px;margin-bottom:8px;flex-wrap:wrap;}
.code-tab{
  background:var(--white);border:1px solid var(--border);border-radius:6px;padding:6px 12px;
  font-size:12.5px;font-weight:600;color:var(--ink-soft);
}
.code-tab.active{background:var(--navy);color:#fff;border-color:var(--navy);}
.testcase-row{border:1px solid var(--paper-line);border-radius:8px;padding:12px;margin-bottom:10px;background:var(--white);}
.code-block{
  background:var(--navy);color:#E4E7F0;font-family:var(--font-mono);font-size:12.5px;line-height:1.6;
  padding:14px 16px;border-radius:8px;overflow:auto;max-height:260px;white-space:pre-wrap;
}

.sample-cases{background:var(--paper);border:1px solid var(--border);border-radius:8px;padding:14px 16px;margin-bottom:16px;}
.sample-case-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:10px;}
.sample-case-row:last-child{margin-bottom:0;}
.sample-case-row b{display:block;font-size:11px;color:var(--ink-soft);letter-spacing:.04em;margin-bottom:4px;}
.sample-case-row pre{margin:0;font-family:var(--font-mono);font-size:12.5px;background:var(--white);border:1px solid var(--border);border-radius:6px;padding:8px 10px;white-space:pre-wrap;word-break:break-word;}

.code-panel{margin-top:18px;}
.code-panel-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:10px;flex-wrap:wrap;}
.code-panel-head select{padding:8px 10px;border:1px solid var(--border);border-radius:6px;font-size:13px;background:var(--white);}
.monaco-container{height:340px;border:1px solid var(--border);border-radius:8px;overflow:hidden;}

.run-output{}
.run-case{border:1px solid var(--border);border-radius:8px;padding:12px 14px;margin-bottom:10px;background:var(--paper);}
.run-case.pass{border-color:var(--green);background:var(--green-soft);}
.run-case.fail{border-color:var(--red);background:var(--red-soft);}
.run-case-head{font-weight:600;font-size:12.5px;margin-bottom:8px;}
.run-case-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px;}
.run-case-grid b{display:block;font-size:10.5px;color:var(--ink-soft);letter-spacing:.04em;margin-bottom:4px;}
.run-case-grid pre{margin:0;font-family:var(--font-mono);font-size:12px;background:var(--white);border:1px solid var(--border);border-radius:6px;padding:7px 9px;white-space:pre-wrap;word-break:break-word;max-height:120px;overflow:auto;}
.run-stderr{margin:8px 0 0;font-family:var(--font-mono);font-size:11.5px;color:var(--red);background:var(--white);border:1px solid var(--border);border-radius:6px;padding:8px 10px;white-space:pre-wrap;max-height:100px;overflow:auto;}

.grading-spinner{
  width:34px;height:34px;border-radius:50%;margin:4px auto 0;
  border:3px solid var(--border);border-top-color:var(--navy);
  animation:spin .8s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg);}}

@media (max-width:820px){
  .sample-case-row,.run-case-grid{grid-template-columns:1fr;}
}

@media (max-width:820px){
  .login-wrap{flex-direction:column;}
  .login-hero{padding:36px 28px;}
  .shell{flex-direction:column;}
  .sidebar{width:100%;flex-direction:row;overflow-x:auto;padding:14px 16px;align-items:center;}
  .brand{display:none;}
  .sidebar-foot{display:none;}
  .nav-item{white-space:nowrap;}
  .main{padding:24px;}
  .result-wrap{flex-direction:column;}
}