/* ============================================================
   EMERGENCY RADIOLOGY — shared design system  ("reading-room journal")
   Warm paper · ink · oxblood · Fraunces (serif display) / Inter / IBM Plex Mono
   Used by index.html (landing), learn.html, dashboard.html
============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400;0,9..144,500;0,9..144,600;0,9..144,700;1,9..144,500;1,9..144,600&family=Inter:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --bg:#f3efe7; --bg2:#efe9dd; --panel:#ffffff; --panel2:#faf6ee; --panel3:#efe8da;
  --line:#e4ddcf; --line2:#d8cfbd; --line3:#c6bba4;
  --ink:#1c1a16; --muted:#6b6356; --dim:#7d7464;
  --amber:#8a2b2b; --amber2:#a93636; --amberd:#6e2020; --amberglow:rgba(138,43,43,.20);
  --green:#15803d; --red:#b3261e; --violet:#6d4aff; --blue:#1d5fd0;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
  --display:"Fraunces",Georgia,"Times New Roman",serif;
  --serif:"Fraunces",Georgia,"Times New Roman",serif;
  --r:10px; --rs:7px; --maxw:1180px;
  --shadow:0 16px 44px rgba(70,45,20,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased}
/* faint warm paper grain + soft top glow */
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background:
    radial-gradient(920px 520px at 88% -12%, rgba(138,43,43,.05), transparent 60%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.045'/%3E%3C/svg%3E");}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px;position:relative;z-index:1}
a{color:var(--amber);text-decoration:none} a:hover{color:var(--amber2)}
h1,h2,h3{font-family:var(--display);font-weight:600;line-height:1.06;letter-spacing:-.015em;margin:0}
.mono{font-family:var(--mono)}
.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:3px;text-transform:uppercase;color:var(--amber);display:inline-flex;align-items:center;gap:8px}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--amber)}

/* ---- nav ---- */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);background:rgba(243,239,231,.82);border-bottom:1px solid var(--line)}
.nav .inner{max-width:var(--maxw);margin:0 auto;padding:13px 22px;display:flex;align-items:center;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--display);font-weight:600;font-size:18px;letter-spacing:0}
.brand .mark{width:26px;height:26px;position:relative;flex:none}
.brand .mark::before,.brand .mark::after{content:"";position:absolute;background:var(--amber)}
.brand .mark::before{left:50%;top:0;bottom:0;width:1.5px;transform:translateX(-50%)}
.brand .mark::after{top:50%;left:0;right:0;height:1.5px;transform:translateY(-50%)}
.brand .mark i{position:absolute;inset:5px;border:1.5px solid var(--amber);border-radius:50%}
.brand b{color:var(--ink);font-weight:600} .brand span{color:var(--amber)}
.nav .links{margin-left:auto;display:flex;gap:6px;align-items:center}
.nav .links a{color:var(--muted);font-size:14px;font-weight:500;padding:8px 12px;border-radius:var(--rs)}
.nav .links a:hover{color:var(--ink);background:var(--panel2)}
.nav .links a.active{color:var(--amber)}

/* ---- buttons ---- */
.btn{display:inline-flex;align-items:center;gap:8px;font-family:var(--sans);font-weight:600;font-size:14.5px;padding:11px 20px;border-radius:var(--rs);border:1px solid transparent;cursor:pointer;transition:.15s;text-decoration:none}
.btn.primary{background:var(--amber);color:#f7f3ea;box-shadow:0 8px 22px rgba(138,43,43,.18)}
.btn.primary:hover{background:var(--amber2);transform:translateY(-1px);color:#fff}
.btn.ghost{background:transparent;border-color:var(--line2);color:var(--ink)}
.btn.ghost:hover{border-color:var(--amber);color:var(--amber)}
.btn.sm{padding:8px 14px;font-size:13px}

/* ---- cards / tiles ---- */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:20px}
.card.lift{transition:.18s} .card.lift:hover{transform:translateY(-3px);border-color:var(--line2);box-shadow:var(--shadow)}
.tile{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:16px 18px}
.tile .k{font-family:var(--mono);font-size:10.5px;letter-spacing:1.5px;text-transform:uppercase;color:var(--dim)}
.tile .v{font-family:var(--display);font-weight:600;font-size:34px;margin-top:6px;line-height:1}
.tile .v small{font-size:15px;color:var(--muted);font-weight:500}
.tile .sub{font-size:12.5px;color:var(--muted);margin-top:4px}

/* ---- progress bar ---- */
.bar{height:8px;border-radius:6px;background:var(--panel3);overflow:hidden}
.bar>i{display:block;height:100%;background:linear-gradient(90deg,var(--amberd),var(--amber));border-radius:6px}
.bar.green>i{background:linear-gradient(90deg,#0f6e36,var(--green))}

/* ---- badges / chips ---- */
.badge{font-family:var(--mono);font-size:10px;font-weight:600;letter-spacing:.5px;padding:2px 8px;border-radius:999px;border:1px solid var(--line2);color:var(--muted)}
.badge.stat{color:var(--red);border-color:#e6bdb8;background:rgba(179,38,30,.07)}
.badge.amber{color:var(--amber);border-color:var(--amberd);background:rgba(138,43,43,.07)}
.chip{font-size:12.5px;color:var(--muted);border:1px solid var(--line2);border-radius:999px;padding:5px 12px;background:var(--panel)}
.dots{display:inline-flex;gap:3px}.dots i{width:7px;height:7px;border-radius:50%;background:var(--line3)}
.dots i.on{background:var(--amber)}

/* ---- section header ---- */
.sec{padding:64px 0}
.sec h2{font-size:30px;margin-top:10px}
.sec .lead{color:var(--muted);max-width:620px;margin-top:12px;font-size:16px}
.grid{display:grid;gap:16px}
.g3{grid-template-columns:repeat(3,1fr)} .g4{grid-template-columns:repeat(4,1fr)} .g2{grid-template-columns:repeat(2,1fr)}
@media(max-width:900px){.g3,.g4,.g2{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.g3,.g4,.g2{grid-template-columns:1fr}}

.footer{border-top:1px solid var(--line);margin-top:40px;padding:28px 0;color:var(--dim);font-size:13px}
.disc{font-family:var(--mono);font-size:11.5px;color:var(--dim);border:1px solid var(--line);border-left:3px solid var(--amberd);border-radius:8px;padding:9px 13px;background:var(--panel)}

/* ---- accessibility ---- */
:focus-visible{outline:2px solid var(--amber);outline-offset:2px;border-radius:3px}
.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:8px;top:-44px;background:var(--amber);color:#fff;padding:9px 14px;border-radius:8px;z-index:200;transition:top .15s}
.skip:focus{top:8px}
@media(prefers-reduced-motion:reduce){*{animation-duration:.001ms!important;transition-duration:.001ms!important}}