/* ============================================================
   PathoFlash — visual system
   Signature: the color-coded clinical flashcard.
   ============================================================ */
:root{
  --ink:#0b1220; --ink-soft:#334155; --muted:#64748b; --line:#e6ebf1;
  --bg:#f5f7fb; --surface:#ffffff;
  --brand-1:#0ea5b7;      /* teal   */
  --brand-2:#4f46e5;      /* indigo */
  --brand-3:#7c3aed;      /* violet */
  --gold:#b7791f; --gold-bg:#fff7e6;
  --danger:#dc2626; --ok:#16a34a; --warn:#d97706;
  --radius:18px; --radius-sm:12px;
  --shadow-sm:0 1px 2px rgba(16,24,40,.06),0 1px 3px rgba(16,24,40,.10);
  --shadow-md:0 10px 30px -12px rgba(16,24,40,.25);
  --shadow-lg:0 30px 60px -20px rgba(16,24,40,.35);
  --grad:linear-gradient(120deg,var(--brand-1),var(--brand-2) 55%,var(--brand-3));
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:"Inter",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  line-height:1.55;-webkit-font-smoothing:antialiased;
}
h1,h2,h3,.display{font-family:"Sora","Inter",sans-serif;letter-spacing:-.02em;line-height:1.1;margin:0}
a{color:var(--brand-2);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
.container{width:min(1140px,92vw);margin-inline:auto}
.small{font-size:.85rem}.muted{color:var(--muted)}
.center{text-align:center}
.mt{margin-top:1rem}.mt2{margin-top:2rem}.mb{margin-bottom:1rem}

/* ---------- buttons ---------- */
.btn{
  --_bg:var(--brand-2);--_fg:#fff;
  display:inline-flex;align-items:center;gap:.5rem;justify-content:center;
  padding:.72rem 1.15rem;border-radius:999px;border:0;cursor:pointer;
  font:600 .95rem/1 "Sora",sans-serif;color:var(--_fg);background:var(--_bg);
  box-shadow:var(--shadow-sm);transition:transform .12s ease,box-shadow .2s ease,filter .2s;
  text-decoration:none;
}
.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow-md);filter:brightness(1.03);text-decoration:none}
.btn:active{transform:translateY(0)}
.btn.grad{background:var(--grad)}
.btn.ghost{--_bg:transparent;--_fg:var(--ink);border:1px solid var(--line)}
.btn.ghost:hover{border-color:var(--brand-2);color:var(--brand-2)}
.btn.block{width:100%}
.btn.danger{--_bg:var(--danger)}
.btn.sm{padding:.5rem .85rem;font-size:.85rem}
.btn.light{--_bg:#fff;--_fg:var(--brand-2);box-shadow:var(--shadow-md)}

/* ---------- forms ---------- */
.field{margin-bottom:1rem}
.field label{display:block;font-weight:600;font-size:.9rem;margin-bottom:.4rem;color:var(--ink-soft)}
.input,textarea,select{
  width:100%;padding:.8rem .95rem;border:1px solid var(--line);border-radius:var(--radius-sm);
  font:inherit;color:var(--ink);background:#fff;transition:border-color .15s,box-shadow .15s;
}
textarea{min-height:90px;resize:vertical}
.input:focus,textarea:focus,select:focus{
  outline:none;border-color:var(--brand-2);box-shadow:0 0 0 4px rgba(79,70,229,.14)
}
.err-text{color:var(--danger);font-size:.82rem;margin-top:.35rem}
.hint{color:var(--muted);font-size:.82rem;margin-top:.35rem}

/* ---------- alerts ---------- */
.alert{padding:.8rem 1rem;border-radius:var(--radius-sm);margin-bottom:1rem;font-size:.92rem;border:1px solid transparent}
.alert.error{background:#fef2f2;color:#991b1b;border-color:#fecaca}
.alert.success{background:#f0fdf4;color:#166534;border-color:#bbf7d0}
.alert.info{background:#eff6ff;color:#1e40af;border-color:#bfdbfe}

/* ---------- top nav ---------- */
.nav{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.82);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;gap:1rem;height:64px}
.brand{display:flex;align-items:center;gap:.6rem;font:800 1.15rem/1 "Sora",sans-serif;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand .logo{width:34px;height:34px;border-radius:10px;background:var(--grad);display:grid;place-items:center;color:#fff;font-size:1.1rem;box-shadow:var(--shadow-sm)}
.nav-links{margin-left:auto;display:flex;align-items:center;gap:.35rem}
.nav-links a{padding:.5rem .8rem;border-radius:999px;color:var(--ink-soft);font-weight:600;font-size:.9rem}
.nav-links a:hover{background:#eef2ff;color:var(--brand-2);text-decoration:none}
.nav-links a.active{background:#eef2ff;color:var(--brand-2)}
.hamburger{margin-left:auto;display:none;background:none;border:1px solid var(--line);border-radius:10px;padding:.45rem .6rem;font-size:1.1rem;cursor:pointer}

/* ---------- hero (landing) ---------- */
.hero{position:relative;overflow:hidden;color:#fff;background:var(--grad)}
.hero::after{content:"";position:absolute;inset:0;background:
  radial-gradient(1200px 500px at 80% -10%,rgba(255,255,255,.25),transparent 60%),
  radial-gradient(800px 400px at 0% 120%,rgba(0,0,0,.18),transparent 55%);pointer-events:none}
.hero-inner{position:relative;z-index:1;padding:clamp(3rem,8vw,6rem) 0 clamp(4rem,9vw,7rem)}
.eyebrow{display:inline-flex;align-items:center;gap:.5rem;background:rgba(255,255,255,.16);
  border:1px solid rgba(255,255,255,.28);padding:.4rem .8rem;border-radius:999px;font-weight:600;font-size:.82rem;margin-bottom:1.1rem}
.hero h1{font-size:clamp(2.4rem,6vw,4.4rem);font-weight:800;max-width:15ch}
.hero p.lead{font-size:clamp(1.05rem,2.4vw,1.35rem);max-width:52ch;margin:1.1rem 0 1.8rem;color:rgba(255,255,255,.92)}
.hero-cta{display:flex;gap:.8rem;flex-wrap:wrap}
.hero-stats{display:flex;gap:2.2rem;margin-top:2.6rem;flex-wrap:wrap}
.hero-stats .n{font:800 2rem/1 "Sora",sans-serif}
.hero-stats .l{font-size:.85rem;color:rgba(255,255,255,.85)}

/* floating sample card in hero */
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:2rem;align-items:center}
.hero-card-wrap{perspective:1200px}
.tilt{transform:rotateY(-12deg) rotateX(6deg);transition:transform .4s}
.hero-card-wrap:hover .tilt{transform:rotateY(-6deg) rotateX(3deg)}

/* ---------- section band ---------- */
.band{padding:clamp(3rem,7vw,5rem) 0}
.section-title{font-size:clamp(1.6rem,3.5vw,2.4rem);font-weight:800}
.section-sub{color:var(--muted);max-width:60ch;margin-top:.6rem}

/* feature cards */
.grid{display:grid;gap:1.1rem}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c4{grid-template-columns:repeat(4,1fr)}
.feature{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.4rem;box-shadow:var(--shadow-sm)}
.feature .ic{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;font-size:1.4rem;background:#eef2ff;margin-bottom:.9rem}
.feature h3{font-size:1.1rem;margin-bottom:.4rem}
.feature p{color:var(--muted);font-size:.92rem;margin:0}

/* category chips */
.chips{display:flex;flex-wrap:wrap;gap:.6rem}
.chip{display:inline-flex;align-items:center;gap:.5rem;padding:.5rem .9rem;border-radius:999px;background:#fff;border:1px solid var(--line);font-weight:600;font-size:.85rem;box-shadow:var(--shadow-sm)}
.chip .dot{width:10px;height:10px;border-radius:50%}

/* ---------- auth ---------- */
.auth-wrap{min-height:calc(100vh - 64px);display:grid;place-items:center;padding:2.5rem 1rem}
.auth-card{width:min(430px,100%);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:2rem}
.auth-card h1{font-size:1.6rem;margin-bottom:.3rem}
.auth-card .sub{color:var(--muted);margin-bottom:1.4rem;font-size:.95rem}
.auth-foot{margin-top:1.2rem;text-align:center;font-size:.9rem;color:var(--muted)}
.pw-meter{height:6px;border-radius:999px;background:#eef1f5;overflow:hidden;margin-top:.4rem}
.pw-meter i{display:block;height:100%;width:0;transition:width .2s,background .2s}

/* ---------- app shell ---------- */
.page{padding:2rem 0 4rem}
.page-head{display:flex;align-items:end;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin-bottom:1.4rem}
.page-head h1{font-size:1.8rem}

/* search box + autocomplete */
.search-shell{position:relative;max-width:640px}
.search-box{display:flex;align-items:center;gap:.6rem;background:#fff;border:1px solid var(--line);border-radius:999px;padding:.5rem .6rem .5rem 1.1rem;box-shadow:var(--shadow-md)}
.search-box input{border:0;outline:0;flex:1;font-size:1.05rem;background:transparent;padding:.5rem 0}
.search-box .mag{font-size:1.2rem;color:var(--muted)}
.ac-list{position:absolute;left:0;right:0;top:calc(100% + .5rem);background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);box-shadow:var(--shadow-lg);overflow:hidden;z-index:30;display:none}
.ac-list.show{display:block}
.ac-item{display:flex;align-items:center;gap:.7rem;padding:.7rem 1rem;cursor:pointer;border-bottom:1px solid #f1f5f9}
.ac-item:last-child{border-bottom:0}
.ac-item:hover,.ac-item.active{background:#f5f7ff}
.ac-item .sp{width:8px;height:26px;border-radius:4px;flex:none}
.ac-item .nm{font-weight:600}
.ac-item .ct{margin-left:auto;font-size:.75rem;color:var(--muted)}
.ac-empty{padding:1rem;color:var(--muted);font-size:.9rem}

/* ---------- THE FLASHCARD (signature) ---------- */
.flashcard{
  --accent:#4f46e5;
  position:relative;background:#fff;border-radius:22px;overflow:hidden;
  box-shadow:var(--shadow-lg);border:1px solid var(--line);
  max-width:820px;margin-inline:auto;
}
.flashcard::before{content:"";position:absolute;left:0;top:0;bottom:0;width:8px;background:var(--accent)}
.fc-head{padding:1.4rem 1.6rem 1.1rem 1.9rem;background:
  linear-gradient(180deg,color-mix(in srgb,var(--accent) 12%,#fff),#fff)}
.fc-cat{display:inline-flex;align-items:center;gap:.45rem;font-weight:700;font-size:.72rem;
  text-transform:uppercase;letter-spacing:.08em;color:var(--accent);
  background:color-mix(in srgb,var(--accent) 12%,#fff);padding:.28rem .7rem;border-radius:999px}
.fc-title{font-size:clamp(1.5rem,4vw,2.1rem);font-weight:800;margin:.6rem 0 .2rem}
.fc-chapter{font-size:.8rem;color:var(--muted)}
.fc-fav{position:absolute;top:1.2rem;right:1.2rem;width:44px;height:44px;border-radius:50%;
  border:1px solid var(--line);background:#fff;cursor:pointer;font-size:1.25rem;display:grid;place-items:center;
  box-shadow:var(--shadow-sm);transition:transform .12s,background .2s}
.fc-fav:hover{transform:scale(1.08)}
.fc-fav.on{background:#fff1f2;border-color:#fecdd3}
.fc-body{padding:1.1rem 1.6rem 1.4rem}
.fc-grid{display:grid;grid-template-columns:1fr 1fr;gap:.9rem}
.sec{--c:#4f46e5;background:#fff;border:1px solid var(--line);border-left:5px solid var(--c);
  border-radius:14px;padding:.85rem 1rem;box-shadow:var(--shadow-sm)}
.sec.full{grid-column:1 / -1}
.sec h4{display:flex;align-items:center;gap:.5rem;font:700 .78rem/1 "Sora",sans-serif;
  text-transform:uppercase;letter-spacing:.06em;color:var(--c);margin-bottom:.45rem}
.sec p{margin:0;font-size:.95rem;color:var(--ink-soft)}
.pearl{margin:1.1rem 1.6rem 1.6rem;background:var(--gold-bg);border:1px solid #fde9c8;border-radius:14px;
  padding:.9rem 1.1rem;display:flex;gap:.7rem;align-items:flex-start}
.pearl .star{font-size:1.2rem}
.pearl h4{font:700 .78rem/1 "Sora";text-transform:uppercase;letter-spacing:.06em;color:var(--gold);margin:0 0 .3rem}
.pearl p{margin:0;color:#7a5713;font-size:.95rem;font-style:italic}

/* no-select on protected content */
.protect{user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}

/* bulleted clinical sections */
.fc-list{margin:0;padding-left:0;list-style:none}
.fc-list li{position:relative;padding-left:1.1rem;margin:.2rem 0;font-size:.95rem;color:var(--ink-soft)}
.fc-list li::before{content:"";position:absolute;left:.15rem;top:.62rem;width:6px;height:6px;border-radius:50%;background:var(--c,#4f46e5)}

/* result + sidebar layout */
.result-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:1.4rem;align-items:start}
.result-main{min-width:0}
.result-side{display:flex;flex-direction:column;gap:1rem;position:sticky;top:82px}
.side-panel{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow-sm);overflow:hidden}
.side-head{font:700 .72rem/1 "Sora",sans-serif;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);
  padding:.85rem 1rem;border-bottom:1px solid var(--line);background:#fafbfc}
.related{display:flex;align-items:center;gap:.6rem;padding:.65rem 1rem;border-bottom:1px solid #f1f5f9;color:var(--ink)}
.related:last-child{border-bottom:0}
.related:hover{background:#f5f7ff;text-decoration:none}
.related .sp{width:7px;height:26px;border-radius:4px;flex:none}
.related .nm{font-weight:600;font-size:.9rem;line-height:1.25;display:flex;flex-direction:column}
.related .nm small{font-weight:500;font-size:.72rem;margin-top:.1rem}
@media (max-width:900px){
  .result-layout{grid-template-columns:1fr}
  .result-side{position:static;flex-direction:column}
}

/* empty state */
.empty{text-align:center;padding:3rem 1rem;color:var(--muted)}
.empty .big{font-size:3rem;margin-bottom:.6rem}

/* favorites grid */
.fav-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1rem}
.fav-card{background:#fff;border:1px solid var(--line);border-left:6px solid var(--accent,#4f46e5);border-radius:16px;padding:1.1rem;box-shadow:var(--shadow-sm);transition:transform .12s,box-shadow .2s;cursor:pointer}
.fav-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}
.fav-card .ct{font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;font-weight:700;color:var(--accent,#4f46e5)}
.fav-card h3{font-size:1.05rem;margin:.35rem 0 .3rem}
.fav-card p{margin:0;font-size:.85rem;color:var(--muted);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ---------- admin ---------- */
.admin-shell{display:grid;grid-template-columns:250px 1fr;min-height:100vh}
.side{background:#0b1220;color:#cbd5e1;padding:1.2rem 1rem;position:sticky;top:0;height:100vh}
.side .brand{color:#fff;margin-bottom:1.6rem}
.side a{display:flex;align-items:center;gap:.7rem;color:#cbd5e1;padding:.7rem .9rem;border-radius:10px;font-weight:600;font-size:.92rem;margin-bottom:.2rem}
.side a:hover,.side a.active{background:rgba(255,255,255,.08);color:#fff;text-decoration:none}
.side .sep{height:1px;background:rgba(255,255,255,.1);margin:1rem 0}
.admin-main{padding:1.8rem 2rem;background:var(--bg)}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;margin-bottom:1.6rem}
.stat{background:#fff;border:1px solid var(--line);border-radius:16px;padding:1.2rem;box-shadow:var(--shadow-sm)}
.stat .n{font:800 2rem/1 "Sora";color:var(--ink)}
.stat .l{color:var(--muted);font-size:.85rem;margin-top:.3rem}
.stat .ic{float:right;font-size:1.5rem;opacity:.8}
.panel{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow-sm);overflow:hidden;margin-bottom:1.5rem}
.panel-head{padding:1rem 1.2rem;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}
.panel-head h2{font-size:1.1rem}
table{width:100%;border-collapse:collapse}
th,td{text-align:left;padding:.75rem 1.2rem;border-bottom:1px solid #f1f5f9;font-size:.9rem;vertical-align:middle}
th{font:700 .75rem/1 "Sora";text-transform:uppercase;letter-spacing:.05em;color:var(--muted);background:#fafbfc}
tbody tr:hover{background:#fafbff}
.badge{display:inline-block;padding:.2rem .6rem;border-radius:999px;font-size:.72rem;font-weight:700}
.badge.ok{background:#dcfce7;color:#166534}.badge.no{background:#fee2e2;color:#991b1b}
.badge.admin{background:#ede9fe;color:#5b21b6}.badge.user{background:#e0f2fe;color:#075985}
.bar{height:10px;border-radius:999px;background:#eef1f5;overflow:hidden}
.bar i{display:block;height:100%;background:var(--grad)}
.toolbar{display:flex;gap:.6rem;flex-wrap:wrap;align-items:center}

/* footer */
.footer{padding:2.5rem 0;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}
.footer .row{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;align-items:center}

/* toast */
#toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(20px);
  background:#0b1220;color:#fff;padding:.8rem 1.2rem;border-radius:999px;font-weight:600;font-size:.9rem;
  box-shadow:var(--shadow-lg);opacity:0;pointer-events:none;transition:.25s;z-index:80}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .grid.c3,.grid.c4{grid-template-columns:1fr 1fr}
  .hero-grid{grid-template-columns:1fr}
  .hero-card-wrap{display:none}
  .stat-grid{grid-template-columns:1fr 1fr}
  .admin-shell{grid-template-columns:1fr}
  .side{position:fixed;left:-260px;top:0;width:250px;transition:left .25s;z-index:60;box-shadow:var(--shadow-lg)}
  .side.open{left:0}
  .admin-main{padding:1.2rem}
}
@media (max-width:640px){
  .nav-links{position:fixed;inset:64px 0 auto 0;background:#fff;flex-direction:column;align-items:stretch;
    padding:.6rem;border-bottom:1px solid var(--line);box-shadow:var(--shadow-md);display:none}
  .nav-links.open{display:flex}
  .nav-links a{padding:.75rem 1rem;border-radius:12px}
  .hamburger{display:inline-block}
  .grid.c3,.grid.c4{grid-template-columns:1fr}
  .fc-grid{grid-template-columns:1fr}
  .stat-grid{grid-template-columns:1fr 1fr}
  .hero-stats{gap:1.4rem}
  table{display:block;overflow-x:auto;white-space:nowrap}
}

/* print / screenshot deterrence */
@media print{ body{display:none !important} }
.blurred{filter:blur(18px) !important;transition:filter .1s}

@media (prefers-reduced-motion:reduce){*{animation:none !important;transition:none !important}}
:focus-visible{outline:3px solid rgba(79,70,229,.5);outline-offset:2px}