/* ===== MechViva AI — blueprint / engineering theme ===== */
:root{
  --bg:#0c1320;
  --bg-2:#111b2d;
  --panel:#16223a;
  --panel-2:#1b2a45;
  --line:#26395c;
  --ink:#eaf1fb;
  --ink-soft:#a9b8d4;
  --muted:#6f82a6;
  --cyan:#22d3ee;
  --cyan-dim:#0e7490;
  --amber:#fbbf24;
  --green:#34d399;
  --red:#fb7185;
  --violet:#a78bfa;
  --radius:16px;
  --shadow:0 12px 40px rgba(0,0,0,.45);
  --font:'Segoe UI',system-ui,-apple-system,Roboto,Helvetica,Arial,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--ink);
  line-height:1.55;
  min-height:100vh;
  position:relative;
  overflow-x:hidden;
}

/* blueprint grid backdrop */
.blueprint-bg{
  position:fixed; inset:0; z-index:-1;
  background:
    radial-gradient(1200px 700px at 80% -10%, rgba(34,211,238,.08), transparent 60%),
    radial-gradient(900px 600px at -10% 110%, rgba(167,139,250,.07), transparent 60%),
    linear-gradient(var(--bg-2),var(--bg));
}
.blueprint-bg::after{
  content:""; position:absolute; inset:0; opacity:.35;
  background-image:
    linear-gradient(rgba(38,57,92,.35) 1px,transparent 1px),
    linear-gradient(90deg,rgba(38,57,92,.35) 1px,transparent 1px);
  background-size:32px 32px;
  -webkit-mask-image:radial-gradient(ellipse at 50% 30%,#000 30%,transparent 85%);
  mask-image:radial-gradient(ellipse at 50% 30%,#000 30%,transparent 85%);
}

/* ===== Header ===== */
.app-header{
  display:flex; align-items:center; justify-content:space-between;
  padding:16px clamp(16px,4vw,40px);
  border-bottom:1px solid var(--line);
  background:rgba(12,19,32,.7);
  backdrop-filter:blur(10px);
  position:sticky; top:0; z-index:20;
}
.brand{display:flex; align-items:center; gap:12px}
.brand-gear{font-size:30px; filter:drop-shadow(0 0 10px rgba(34,211,238,.5))}
.brand h1{font-size:22px; letter-spacing:.5px}
.brand-ai{color:var(--cyan)}
.brand-sub{font-size:12px; color:var(--muted); letter-spacing:.3px}
.header-actions{display:flex; gap:8px}

/* ===== Buttons ===== */
.ghost-btn{
  background:var(--panel); color:var(--ink-soft);
  border:1px solid var(--line); border-radius:10px;
  padding:9px 14px; font-size:14px; cursor:pointer; transition:.15s;
}
.ghost-btn:hover{border-color:var(--cyan); color:var(--ink)}
.primary-btn{
  background:linear-gradient(135deg,var(--cyan),#3b82f6);
  color:#04121c; font-weight:700; border:none; border-radius:10px;
  padding:11px 22px; font-size:15px; cursor:pointer; transition:.15s;
  box-shadow:0 6px 20px rgba(34,211,238,.25);
}
.primary-btn:hover{transform:translateY(-1px); box-shadow:0 10px 28px rgba(34,211,238,.35)}
.primary-btn:disabled{opacity:.5; cursor:not-allowed; transform:none}
.primary-btn.big{padding:15px 40px; font-size:17px}
.text-btn{background:none; border:none; color:var(--muted); cursor:pointer; font-size:13px; text-decoration:underline; padding:6px}
.text-btn:hover{color:var(--red)}
.text-link{color:var(--cyan); text-decoration:none; font-size:14px}
.text-link:hover{text-decoration:underline}

/* ===== Main / screens ===== */
.app-main{max-width:1080px; margin:0 auto; padding:clamp(20px,4vw,40px)}
.screen{display:none; animation:fade .35s ease}
html[data-screen="setup"] #screen-setup,
html[data-screen="interview"] #screen-interview,
html[data-screen="evaluating"] #screen-evaluating,
html[data-screen="report"] #screen-report{display:block}
@keyframes fade{from{opacity:0; transform:translateY(8px)}to{opacity:1; transform:none}}

/* ===== Hero ===== */
.hero{text-align:center; margin-bottom:28px}
.hero h2{font-size:clamp(22px,3.4vw,32px); line-height:1.2; margin-bottom:10px}
.hero p{color:var(--ink-soft); max-width:680px; margin:0 auto; font-size:15px}
.hero em{color:var(--cyan); font-style:normal}

/* ===== Cards ===== */
.card{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line); border-radius:var(--radius);
  padding:20px; box-shadow:var(--shadow);
}
.setup-grid{display:grid; grid-template-columns:1fr 1fr; gap:18px; margin-bottom:18px}
.card-head{display:flex; align-items:center; justify-content:space-between; margin-bottom:12px}
.card-head h3{font-size:16px; color:var(--ink)}
.muted-tag{font-size:12px; color:var(--muted)}
.file-pill{
  font-size:13px; background:var(--panel-2); border:1px solid var(--line);
  border-radius:20px; padding:6px 14px; cursor:pointer; color:var(--cyan); transition:.15s;
}
.file-pill:hover{border-color:var(--cyan)}

textarea,input,select{
  width:100%; font-family:var(--font); font-size:14px;
  background:var(--bg); color:var(--ink);
  border:1px solid var(--line); border-radius:10px; padding:12px;
  resize:vertical;
}
textarea:focus,input:focus,select:focus{outline:none; border-color:var(--cyan); box-shadow:0 0 0 3px rgba(34,211,238,.15)}
select{cursor:pointer}
.hint{font-size:12px; color:var(--muted); margin-top:8px}
.hint.ok{color:var(--green)}

.options-card{margin-bottom:24px}
.options-row{display:grid; grid-template-columns:repeat(4,1fr); gap:14px}
.opt{display:flex; flex-direction:column; gap:6px; font-size:13px; color:var(--ink-soft)}
.opt span{font-weight:600}

.start-row{display:flex; flex-direction:column; align-items:center; gap:12px}
.error-line{color:var(--red); font-size:14px; background:rgba(251,113,133,.1); border:1px solid rgba(251,113,133,.3); padding:10px 16px; border-radius:10px}
.privacy-note{text-align:center; color:var(--muted); font-size:12.5px; margin-top:18px; max-width:640px; margin-left:auto; margin-right:auto}

/* ===== Interview screen ===== */
.iv-bar{margin-bottom:24px}
.iv-progress{height:8px; background:var(--panel); border-radius:99px; overflow:hidden; border:1px solid var(--line)}
.iv-progress-fill{height:100%; width:0%; background:linear-gradient(90deg,var(--cyan),var(--violet)); transition:width .4s ease}
.iv-meta{display:flex; justify-content:space-between; margin-top:8px; font-size:13px; color:var(--ink-soft)}
.iv-cat{background:var(--panel-2); border:1px solid var(--line); border-radius:20px; padding:2px 12px; color:var(--cyan); font-size:12px}

.iv-stage{display:flex; gap:16px; margin-bottom:20px; align-items:flex-start}
.interviewer{text-align:center; flex-shrink:0}
.interviewer-avatar{font-size:44px; width:72px; height:72px; display:grid; place-items:center; background:var(--panel); border:1px solid var(--line); border-radius:50%; box-shadow:0 0 24px rgba(34,211,238,.2)}
.interviewer-name{font-size:11px; color:var(--muted); margin-top:6px}
.question-bubble{
  background:linear-gradient(180deg,var(--panel-2),var(--panel));
  border:1px solid var(--line); border-left:3px solid var(--cyan);
  border-radius:14px; padding:18px 20px; flex:1; box-shadow:var(--shadow);
}
.question-bubble p{font-size:18px; line-height:1.5}

.answer-zone{margin-bottom:16px}
.answer-actions{display:flex; align-items:center; gap:10px; margin-top:12px}
.answer-actions .spacer,.modal-actions .spacer,.history-item .spacer{flex:1}
.mic-status{font-size:13px; color:var(--cyan)}
.mic-status.rec{color:var(--red)}
#endEarlyBtn{display:block; margin:0 auto}

/* ===== Evaluating loader ===== */
.loader{text-align:center; padding:80px 20px}
.gear-spinner{font-size:64px; animation:spin 3s linear infinite; display:inline-block}
@keyframes spin{to{transform:rotate(360deg)}}
.loader h2{margin:20px 0 8px}
.loader p{color:var(--ink-soft)}

/* ===== Report ===== */
.report-head{text-align:center; margin-bottom:28px}
.score-ring{
  --pct:0; width:170px; height:170px; border-radius:50%; margin:0 auto 16px;
  background:conic-gradient(var(--ring-color,var(--cyan)) calc(var(--pct)*1%), var(--panel) 0);
  display:grid; place-items:center; position:relative;
}
.score-ring::before{content:""; position:absolute; inset:12px; border-radius:50%; background:var(--bg-2); border:1px solid var(--line)}
.score-ring-inner{position:relative; text-align:center}
.score-ring-inner .num{font-size:46px; font-weight:800; line-height:1}
.score-ring-inner .lbl{font-size:12px; color:var(--muted)}
.verdict-chip{display:inline-block; padding:8px 22px; border-radius:30px; font-weight:700; font-size:16px; margin-top:6px}
.report-summary{max-width:760px; margin:16px auto 0; color:var(--ink-soft); font-size:15px}
.report-level{font-size:13px; color:var(--muted); margin-top:6px}
.report-level b{color:var(--amber)}

.section-title{font-size:18px; margin:34px 0 16px; display:flex; align-items:center; gap:10px}
.section-title::before{content:""; width:4px; height:20px; background:var(--cyan); border-radius:2px}

.dims-grid{display:grid; grid-template-columns:repeat(auto-fill,minmax(230px,1fr)); gap:14px}
.dim-card{background:var(--panel); border:1px solid var(--line); border-radius:12px; padding:16px}
.dim-top{display:flex; justify-content:space-between; align-items:baseline; margin-bottom:8px}
.dim-name{font-size:14px; font-weight:600}
.dim-score{font-size:20px; font-weight:800}
.dim-bar{height:6px; background:var(--bg); border-radius:99px; overflow:hidden; margin-bottom:8px}
.dim-bar-fill{height:100%; border-radius:99px}
.dim-comment{font-size:12.5px; color:var(--ink-soft)}

.cols-2{display:grid; grid-template-columns:1fr 1fr; gap:16px}
.list-card{background:var(--panel); border:1px solid var(--line); border-radius:12px; padding:18px}
.list-card h4{font-size:15px; margin-bottom:10px; display:flex; gap:8px; align-items:center}
.list-card ul{list-style:none; display:flex; flex-direction:column; gap:8px}
.list-card li{font-size:13.5px; color:var(--ink-soft); padding-left:20px; position:relative}
.list-card li::before{content:"›"; position:absolute; left:4px; color:var(--cyan); font-weight:800}
.list-card.good li::before{content:"✓"; color:var(--green)}
.list-card.bad li::before{content:"!"; color:var(--amber)}

/* per-question accordion */
.q-item{background:var(--panel); border:1px solid var(--line); border-radius:12px; margin-bottom:12px; overflow:hidden}
.q-summary{display:flex; align-items:center; gap:14px; padding:16px 18px; cursor:pointer; list-style:none}
.q-summary::-webkit-details-marker{display:none}
.q-badge{flex-shrink:0; width:46px; height:46px; border-radius:10px; display:grid; place-items:center; font-weight:800; font-size:16px}
.q-qtext{flex:1; font-size:14.5px; font-weight:600}
.q-cat{font-size:11px; color:var(--muted); display:block; font-weight:400; margin-top:2px}
.q-chevron{color:var(--muted); transition:.2s}
details[open] .q-chevron{transform:rotate(90deg)}
.q-body{padding:0 18px 18px; border-top:1px solid var(--line); margin-top:0}
.q-body .q-block{margin-top:14px}
.q-body .q-block h5{font-size:12px; text-transform:uppercase; letter-spacing:.5px; color:var(--muted); margin-bottom:5px}
.q-answer{background:var(--bg); border:1px solid var(--line); border-radius:8px; padding:10px 12px; font-size:13.5px; color:var(--ink-soft); white-space:pre-wrap}
.q-model{background:rgba(52,211,153,.07); border:1px solid rgba(52,211,153,.25); border-radius:8px; padding:10px 12px; font-size:13.5px; color:var(--ink)}
.mini-list{font-size:13px; color:var(--ink-soft); padding-left:18px}
.mini-list li{margin-bottom:4px}

.report-actions{display:flex; gap:12px; justify-content:center; margin:34px 0 10px; flex-wrap:wrap}

/* study plan */
.study-step{display:flex; gap:12px; align-items:flex-start; padding:12px 0; border-bottom:1px solid var(--line)}
.study-step:last-child{border:none}
.study-num{flex-shrink:0; width:26px; height:26px; border-radius:50%; background:var(--violet); color:#1a1030; display:grid; place-items:center; font-weight:800; font-size:13px}
.study-text{font-size:14px; color:var(--ink-soft)}

/* ===== Modals ===== */
.modal-overlay{position:fixed; inset:0; background:rgba(4,8,16,.78); backdrop-filter:blur(4px); display:grid; place-items:center; z-index:50; padding:20px}
.modal-overlay[hidden]{display:none}
.modal{background:linear-gradient(180deg,var(--panel),var(--bg-2)); border:1px solid var(--line); border-radius:18px; padding:28px; max-width:480px; width:100%; position:relative; box-shadow:var(--shadow)}
.modal-close{position:absolute; top:14px; right:14px; background:none; border:none; color:var(--muted); font-size:18px; cursor:pointer}
.modal-close:hover{color:var(--ink)}
.modal h3{margin-bottom:10px}
.modal-text{color:var(--ink-soft); font-size:14px; margin-bottom:16px}
.field-label{display:block; font-size:13px; color:var(--ink-soft); margin:12px 0 6px; font-weight:600}
.modal-actions{display:flex; align-items:center; gap:10px; margin-top:18px}
.key-status{margin-top:12px; font-size:13px; min-height:18px}
.key-status.ok{color:var(--green)}
.key-status.err{color:var(--red)}

.history-list{display:flex; flex-direction:column; gap:10px; max-height:60vh; overflow-y:auto}
.history-item{display:flex; align-items:center; gap:12px; background:var(--panel-2); border:1px solid var(--line); border-radius:10px; padding:12px 14px; cursor:pointer; transition:.15s}
.history-item:hover{border-color:var(--cyan)}
.history-item .hscore{font-size:20px; font-weight:800; width:46px; text-align:center}
.history-item .hmeta{flex:1}
.history-item .htitle{font-size:14px; font-weight:600}
.history-item .hdate{font-size:12px; color:var(--muted)}
.history-item .hdel{background:none; border:none; color:var(--muted); cursor:pointer; font-size:16px}
.history-item .hdel:hover{color:var(--red)}
.history-empty{text-align:center; color:var(--muted); padding:30px}

/* ===== Responsive ===== */
@media(max-width:760px){
  .setup-grid{grid-template-columns:1fr}
  .options-row{grid-template-columns:1fr 1fr}
  .cols-2{grid-template-columns:1fr}
  .iv-stage{flex-direction:column; align-items:center; text-align:center}
  .question-bubble{border-left:none; border-top:3px solid var(--cyan)}
  .brand-sub{display:none}
}