:root{
    --bg:#f5f7fb;
    --panel:#ffffff;
    --text:#172033;
    --muted:#667085;
    --brand:#1746a2;
    --brand2:#0f6fd8;
    --border:#dfe5ee;
    --soft:#edf4ff;
    --success:#16794a;
    --shadow:0 12px 34px rgba(21,34,50,.08);
    font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}

*{box-sizing:border-box}
body{
    margin:0;
    background:linear-gradient(180deg,#eef4ff 0,#f7f8fb 280px);
    color:var(--text);
}
button,input,select{font:inherit}
button{cursor:pointer}

.app-shell{
    width:min(1100px,calc(100% - 28px));
    margin:0 auto;
    padding:28px 0 40px;
}

.hero{
    display:flex;
    justify-content:space-between;
    align-items:center;
    gap:20px;
    padding:18px 4px 24px;
}
.eyebrow{
    display:inline-block;
    font-weight:800;
    letter-spacing:.12em;
    color:var(--brand);
    text-transform:uppercase;
    font-size:.78rem;
}
h1{
    margin:.15rem 0 0;
    font-size:clamp(2.2rem,7vw,4.6rem);
    line-height:.95;
}
.subtitle{
    margin:.55rem 0 0;
    color:var(--muted);
    font-size:1.1rem;
}
.status-pill{
    background:#fff;
    border:1px solid var(--border);
    padding:10px 14px;
    border-radius:999px;
    font-weight:700;
    color:var(--muted);
    box-shadow:var(--shadow);
}

.panel{
    background:var(--panel);
    border:1px solid var(--border);
    border-radius:22px;
    box-shadow:var(--shadow);
    padding:24px;
}

.intro-panel{
    display:grid;
    grid-template-columns:1.2fr 1fr;
    gap:24px;
    align-items:end;
}
h2,h3{margin-top:0}
.intro-panel p{
    color:var(--muted);
    max-width:700px;
    line-height:1.6;
}

.selector-grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:14px;
}
label span,label{
    color:var(--muted);
    font-weight:700;
}
select,input{
    width:100%;
    margin-top:7px;
    border:1px solid var(--border);
    border-radius:12px;
    padding:13px 14px;
    background:#fff;
    color:var(--text);
}
select:focus,input:focus{
    outline:3px solid rgba(23,70,162,.12);
    border-color:var(--brand);
}

.mode-cards{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:14px;
    margin:18px 0;
}
.mode-card{
    text-align:left;
    border:1px solid var(--border);
    background:#fff;
    border-radius:18px;
    padding:18px;
    min-height:140px;
    box-shadow:0 7px 18px rgba(21,34,50,.05);
    transition:.15s ease;
}
.mode-card:hover,.mode-card.active{
    border-color:var(--brand);
    transform:translateY(-2px);
    background:var(--soft);
}
.mode-card .icon{
    display:block;
    font-size:2rem;
    margin-bottom:10px;
}
.mode-card strong{
    display:block;
    font-size:1.08rem;
}
.mode-card small{
    display:block;
    color:var(--muted);
    margin-top:5px;
    line-height:1.4;
}

.chat-panel{padding:0;overflow:hidden}
.chat-window{
    min-height:360px;
    max-height:520px;
    overflow:auto;
    padding:24px;
    background:
      radial-gradient(circle at top right,rgba(23,70,162,.06),transparent 28%),
      #fbfcfe;
}
.message{
    display:flex;
    gap:10px;
    align-items:flex-start;
    margin-bottom:18px;
}
.message.user{justify-content:flex-end}
.message.user .avatar{order:2;background:#334155}
.message.user .bubble{background:#e9eef6}
.avatar{
    width:38px;
    height:38px;
    border-radius:50%;
    background:var(--brand);
    color:#fff;
    display:grid;
    place-items:center;
    font-weight:800;
    flex:0 0 auto;
}
.bubble{
    max-width:min(720px,82%);
    background:#fff;
    border:1px solid var(--border);
    border-radius:16px;
    padding:14px 16px;
    line-height:1.55;
}
.bubble p{margin:.35rem 0 0}
.bubble ul{margin:.6rem 0 .2rem;padding-left:1.2rem}

.quick-actions{
    display:flex;
    gap:10px;
    flex-wrap:wrap;
    padding:16px 24px;
    border-top:1px solid var(--border);
}
.quick-actions button{
    border:1px solid var(--border);
    background:#fff;
    padding:9px 12px;
    border-radius:999px;
    color:var(--brand);
    font-weight:700;
}
.quick-actions button:hover{background:var(--soft)}

.question-box{
    border-top:1px solid var(--border);
    padding:18px 24px 22px;
}
.question-row{
    display:grid;
    grid-template-columns:1fr auto;
    gap:10px;
}
.question-row button{
    margin-top:7px;
    border:0;
    border-radius:12px;
    background:var(--brand);
    color:#fff;
    padding:0 22px;
    font-weight:800;
}
.help{
    margin:.5rem 0 0;
    color:var(--muted);
    font-size:.86rem;
}

.progress-panel{
    margin-top:18px;
    display:grid;
    grid-template-columns:220px 1fr;
    gap:20px;
    align-items:center;
}
.progress-panel p{
    margin:0;
    color:var(--muted);
}
.progress-track{
    height:14px;
    border-radius:999px;
    background:#e8edf5;
    overflow:hidden;
}
.progress-bar{
    height:100%;
    border-radius:inherit;
    background:linear-gradient(90deg,var(--brand),var(--brand2));
    transition:width .25s ease;
}

footer{
    text-align:center;
    color:var(--muted);
    padding-top:18px;
    font-size:.9rem;
}

@media (max-width:800px){
    .hero{align-items:flex-start;flex-direction:column}
    .intro-panel{grid-template-columns:1fr}
    .mode-cards{grid-template-columns:1fr 1fr}
    .progress-panel{grid-template-columns:1fr}
}
@media (max-width:520px){
    .app-shell{width:min(100% - 18px,1100px);padding-top:16px}
    .selector-grid,.mode-cards{grid-template-columns:1fr}
    .question-row{grid-template-columns:1fr}
    .question-row button{padding:13px}
    .bubble{max-width:88%}
}