/* ============================================================
   Diabetes Foundations for Acute Care Dietitians — Part 1
   Stylesheet
   ============================================================ */

:root{
  --bg:#EFF3F1;
  --surface:#FFFFFF;
  --ink:#16302C;
  --ink-soft:#4B615D;
  --ink-faint:#7C928D;
  --line:#D3DDD9;
  --primary:#0E5C50;
  --primary-dark:#0A4038;
  --primary-soft:#DCEDE8;
  --correct:#2E7D46;
  --correct-soft:#E3F3E7;
  --incorrect:#A8402C;
  --incorrect-soft:#F7E7E2;
  --warn:#966300;
  --warn-soft:#FBF0DA;
  --radius:14px;
  --serif:'Source Serif 4', Georgia, serif;
  --sans:'IBM Plex Sans', -apple-system, sans-serif;
  --mono:'IBM Plex Mono', monospace;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
a{color:inherit;}
button{font-family:inherit;cursor:pointer;}

.app{max-width:760px;margin:0 auto;padding:20px 20px 64px;}

/* ---------- top bar / header ---------- */
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 0 18px;
  border-bottom:1px solid var(--line);
  margin-bottom:22px;
  gap:12px;
  flex-wrap:wrap;
}
.brand{display:flex;align-items:center;gap:14px;min-width:0;}
.site-logo-link{display:inline-flex;align-items:center;flex-shrink:0;}
/* Horizontal logo: constrain by height, let width follow the natural
   aspect ratio, and cap the width so a wide mark never crowds the nav. */
.site-logo{
  display:block;
  height:42px;
  width:auto;
  max-width:260px;
  object-fit:contain;
}
.brand-text{display:flex;flex-direction:column;line-height:1.2;}
.brand-text .kicker{font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--ink-faint);text-transform:uppercase;}
.brand-text .title{font-family:var(--serif);font-weight:600;font-size:17px;}
.nav-links{display:flex;gap:16px;font-size:13px;}
.nav-links button{background:none;border:none;color:var(--ink-soft);padding:4px 0;border-bottom:2px solid transparent;font-weight:500;}
.nav-links button:hover{color:var(--primary-dark);}
.nav-links button.active{color:var(--primary-dark);border-bottom-color:var(--primary);}

/* ---------- progress trace ribbon ---------- */
.trend-wrap{margin:0 0 26px;}
.trend-svg{width:100%;height:64px;display:block;}
.trend-caption{
  display:flex;justify-content:space-between;font-family:var(--mono);
  font-size:12px;color:var(--ink-soft);margin-top:6px;
}

/* ---------- cards & typography ---------- */
.card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:28px;
  margin-bottom:20px;
}
.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--primary-dark);margin-bottom:8px;}
h1{font-family:var(--serif);font-size:30px;line-height:1.2;margin:0 0 10px;}
h2{font-family:var(--serif);font-size:22px;line-height:1.3;margin:0 0 12px;}
p{line-height:1.6;color:var(--ink-soft);}
.lead{font-size:16px;}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--primary);color:#fff;border:none;
  padding:12px 22px;border-radius:10px;font-weight:600;font-size:15px;
  transition:background .15s ease;
}
.btn:hover{background:var(--primary-dark);}
.btn:disabled{background:#B7C4C0;cursor:not-allowed;}
.btn.secondary{background:var(--surface);color:var(--primary-dark);border:1.5px solid var(--primary);}
.btn.secondary:hover{background:var(--primary-soft);}
.btn.ghost{background:none;color:var(--ink-soft);border:1px solid var(--line);}

.meta-row{display:flex;gap:18px;flex-wrap:wrap;margin:18px 0;}
.meta-item{font-size:13px;color:var(--ink-soft);}
.meta-item b{color:var(--ink);}
.btn-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px;}

/* ---------- question screen ---------- */
.q-header{display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:10px;margin-bottom:18px;}
.q-progress-text{font-family:var(--mono);font-size:13px;color:var(--ink-soft);}
.tag{display:inline-block;font-size:11px;font-family:var(--mono);padding:3px 9px;border-radius:99px;background:var(--primary-soft);color:var(--primary-dark);margin-right:6px;}
.tag.warn{background:var(--warn-soft);color:var(--warn);}
.q-text{font-family:var(--serif);font-size:21px;line-height:1.45;margin:14px 0 22px;}
.options{display:flex;flex-direction:column;gap:10px;}
.option{
  display:flex;gap:12px;align-items:flex-start;
  padding:14px 16px;border-radius:10px;border:1.5px solid var(--line);
  background:var(--surface);text-align:left;font-size:15px;line-height:1.5;
  color:var(--ink);width:100%;
}
.option:hover:not(.locked){border-color:var(--primary);background:var(--primary-soft);}
.option.selected{border-color:var(--primary);background:var(--primary-soft);}
.option .letter{font-family:var(--mono);font-weight:600;color:var(--primary-dark);flex-shrink:0;}
.option.locked{cursor:default;}
.option.correct-answer{border-color:var(--correct);background:var(--correct-soft);}
.option.correct-answer .letter{color:var(--correct);}
.option.wrong-answer{border-color:var(--incorrect);background:var(--incorrect-soft);}
.option.wrong-answer .letter{color:var(--incorrect);}

/* ---------- feedback card ---------- */
.feedback-banner{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-size:20px;font-weight:600;margin-bottom:18px;}
.feedback-banner.correct{color:var(--correct);}
.feedback-banner.incorrect{color:var(--incorrect);}
.icon-circle{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:16px;color:#fff;flex-shrink:0;}
.icon-circle.correct{background:var(--correct);}
.icon-circle.incorrect{background:var(--incorrect);}
.fb-section{margin-top:20px;padding-top:18px;border-top:1px solid var(--line);}
.fb-section:first-of-type{margin-top:0;padding-top:0;border-top:none;}
.fb-label{font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-faint);margin-bottom:8px;}
.fb-answer-pill{display:inline-block;font-weight:700;font-family:var(--mono);margin-right:8px;}
.refs{font-size:12.5px;color:var(--ink-faint);line-height:1.7;}
.refs ol{margin:0;padding-left:18px;}
.flag-note{
  margin-top:16px;padding:12px 14px;border-radius:8px;
  background:var(--warn-soft);color:var(--warn);font-size:13px;line-height:1.5;
  border:1px solid #EAD6A6;
}

/* ---------- completion ---------- */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:14px;margin:20px 0;}
.stat{background:var(--primary-soft);border-radius:10px;padding:16px;}
.stat .num{font-family:var(--serif);font-size:28px;font-weight:600;color:var(--primary-dark);}
.stat .label{font-size:12px;color:var(--ink-soft);margin-top:2px;}
.topic-row{display:flex;justify-content:space-between;padding:9px 0;border-bottom:1px solid var(--line);font-size:14px;}
.topic-row:last-child{border-bottom:none;}

/* ---------- references list ---------- */
.footer-note{text-align:center;font-size:12px;color:var(--ink-faint);margin-top:30px;}

/* ---------- loading / error states ---------- */
.loading, .load-error{text-align:center;padding:60px 20px;color:var(--ink-soft);}
.load-error{color:var(--incorrect);}

/* ---------- accessibility: visible keyboard focus ---------- */
:focus-visible{outline:3px solid var(--primary);outline-offset:2px;border-radius:6px;}

/* ---------- responsive ---------- */
@media (max-width:520px){
  .card{padding:20px;}
  h1{font-size:24px;}
  .q-text{font-size:18px;}
  .site-logo{height:34px;max-width:190px;}
  .brand{gap:10px;}
}

@media (max-width:380px){
  .site-logo{height:30px;max-width:160px;}
}