:root {
  --bg: #0f1419;
  --bg-soft: #161c24;
  --surface: #1c242e;
  --surface-2: #232d39;
  --border: #2c3744;
  --border-soft: #232d39;
  --text: #e6edf3;
  --text-soft: #9aa7b4;
  --text-dim: #6b7785;
  --accent: #2dd4a7;
  --accent-soft: #0f3d33;
  --accent-text: #5eead4;
  --blue: #4d96ff;
  --blue-soft: #15294a;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,.35);
  --font-fa: 'Vazirmatn', sans-serif;
  --font-en: 'Inter', sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: radial-gradient(1200px 600px at 80% -10%, #14302a 0%, transparent 55%),
              radial-gradient(900px 500px at -10% 10%, #14233f 0%, transparent 50%),
              var(--bg);
  color: var(--text);
  font-family: var(--font-fa);
  min-height: 100vh;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
body[data-lang="en"] { font-family: var(--font-en); direction: ltr; }

/* Topbar */
.topbar { display:flex; align-items:center; justify-content:space-between; padding:18px 22px; max-width:820px; margin:0 auto; }
.brand { display:flex; align-items:center; gap:14px; }
.brand-mark { width:46px; height:46px; border-radius:12px; background:linear-gradient(135deg,var(--accent),#1b9e7d); color:#04201a; font-size:22px; display:grid; place-items:center; box-shadow:0 6px 18px rgba(45,212,167,.3); }
.brand-text h1 { font-size:22px; font-weight:700; font-family:var(--font-en); }
.brand-text h1 span { color:var(--accent); }
.brand-text p { font-size:12.5px; color:var(--text-soft); }
.lang-toggle { background:var(--surface); border:1px solid var(--border); color:var(--text-soft); padding:8px 14px; border-radius:10px; cursor:pointer; font-size:13px; font-weight:600; transition:.18s; font-family:var(--font-en); }
.lang-toggle:hover { border-color:var(--accent); color:var(--accent-text); }

/* Container & cards */
.container { max-width:820px; margin:0 auto; padding:8px 16px 40px; }
.card { background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:20px; margin-bottom:16px; box-shadow:var(--shadow); }
.field-label { display:block; font-size:14px; font-weight:600; margin-bottom:10px; }

/* Search */
.search-wrap { position:relative; display:flex; align-items:center; }
.search-icon { position:absolute; inset-inline-start:14px; color:var(--text-dim); font-size:18px; pointer-events:none; }
#drugSearch { width:100%; padding:13px 44px; border-radius:var(--radius-sm); background:var(--bg-soft); border:1px solid var(--border); color:var(--text); font-size:15px; font-family:inherit; transition:.18s; }
#drugSearch:focus { outline:none; border-color:var(--accent); box-shadow:0 0 0 3px var(--accent-soft); }
#drugSearch::placeholder { color:var(--text-dim); }
.clear-btn { position:absolute; inset-inline-end:12px; background:none; border:none; color:var(--text-dim); font-size:22px; cursor:pointer; padding:0 6px; }
.clear-btn:hover { color:var(--text); }
.suggestions { margin-top:6px; background:var(--surface-2); border:1px solid var(--border); border-radius:var(--radius-sm); max-height:300px; overflow-y:auto; }
.sugg-item { padding:11px 14px; cursor:pointer; border-bottom:1px solid var(--border-soft); display:flex; align-items:center; justify-content:space-between; gap:10px; transition:.12s; }
.sugg-item:last-child { border-bottom:none; }
.sugg-item:hover, .sugg-item.active { background:var(--accent-soft); }
.sugg-name { font-size:14px; font-weight:500; font-family:var(--font-en); color:var(--text); }
.sugg-class { font-size:11.5px; color:var(--text-dim); font-family:var(--font-en); margin-top:2px; }
.sugg-badge { font-size:11px; padding:2px 8px; border-radius:20px; background:var(--accent-soft); color:var(--accent-text); font-weight:600; white-space:nowrap; flex-shrink:0; }
.sugg-badge.no-dose { background:var(--surface); color:var(--text-dim); }
.hint { font-size:12px; color:var(--text-dim); margin-top:10px; }

/* Drug header */
.drug-header-card { background:linear-gradient(135deg,var(--surface),var(--bg-soft)); }
#drugName { font-size:26px; font-weight:700; font-family:var(--font-en); }
.drug-class { font-size:13.5px; color:var(--accent-text); margin-top:4px; font-family:var(--font-en); }

/* Calculator */
.section-title { font-size:16px; font-weight:700; margin-bottom:16px; display:flex; align-items:center; gap:8px; }
.section-title::before { content:''; width:4px; height:17px; background:var(--accent); border-radius:4px; }
.calc-grid { display:grid; grid-template-columns:1fr 1fr; gap:12px; }
.calc-field { margin-bottom:14px; }
.calc-field label { display:block; font-size:13px; color:var(--text-soft); margin-bottom:7px; font-weight:500; }
.calc-field select, .calc-field input { width:100%; padding:11px 14px; border-radius:var(--radius-sm); background:var(--bg-soft); border:1px solid var(--border); color:var(--text); font-size:14px; font-family:inherit; transition:.18s; }
.calc-field select:focus, .calc-field input:focus { outline:none; border-color:var(--accent); box-shadow:0 0 0 3px var(--accent-soft); }
#doseSelect { font-family:var(--font-en); font-size:13px; }

/* Route buttons */
.route-buttons { display:flex; flex-wrap:wrap; gap:8px; margin-bottom:6px; }
.route-btn { padding:9px 18px; border-radius:8px; cursor:pointer; font-size:13.5px; font-weight:600; border:1.5px solid var(--border); background:var(--bg-soft); color:var(--text-soft); transition:.15s; font-family:inherit; }
.route-btn:hover { border-color:var(--accent-text); color:var(--text); }
.route-btn.active { background:var(--accent); color:#04201a; border-color:var(--accent); }
.route-btn.no-data { opacity:.45; }
.route-btn.no-data.active { opacity:.7; }
.route-btn.extra { border-style:dashed; }
.route-hint { font-size:11.5px; color:var(--text-dim); margin-top:6px; }

/* Results */
.result-box { display:grid; grid-template-columns:1fr 1fr; gap:12px; margin-top:16px; }
.result-item { background:var(--accent-soft); border:1px solid #1b5a4a; border-radius:var(--radius-sm); padding:16px; text-align:center; }
.result-item.blue { background:var(--blue-soft); border-color:#234a7a; }
.result-label { display:block; font-size:12.5px; color:var(--accent-text); margin-bottom:6px; font-weight:500; }
.result-item.blue .result-label { color:#8fbaff; }
.result-value { display:block; font-size:24px; font-weight:700; color:#7ff0d8; font-family:var(--font-en); }
.result-item.blue .result-value { color:#a9caff; }
.calc-note { font-size:12px; color:var(--text-dim); margin-top:12px; padding-top:10px; border-top:1px dashed var(--border); font-family:var(--font-en); direction:ltr; text-align:start; }

/* Tabs */
.tabs { display:flex; gap:6px; margin-bottom:16px; flex-wrap:wrap; }
.tab { background:var(--bg-soft); border:1px solid var(--border); color:var(--text-soft); padding:8px 16px; border-radius:20px; cursor:pointer; font-size:13.5px; font-weight:500; font-family:inherit; transition:.15s; }
.tab:hover { color:var(--text); }
.tab.active { background:var(--accent); color:#04201a; border-color:var(--accent); font-weight:600; }
.tab-content { font-family:var(--font-en); direction:ltr; text-align:start; font-size:13.5px; line-height:1.85; color:var(--text-soft); white-space:pre-wrap; word-wrap:break-word; max-height:500px; overflow-y:auto; padding-inline-end:4px; }
.tab-content strong { color:var(--text); font-weight:600; }
.sp-head { color:var(--accent-text); font-weight:700; display:inline-block; margin-top:10px; margin-bottom:2px; }

/* Empty state */
.empty-state { text-align:center; padding:60px 20px; color:var(--text-soft); }
.empty-state h2 { font-size:19px; color:var(--text); margin-bottom:8px; font-weight:600; }
.empty-state p { font-size:14px; }

/* Footer */
.footer { text-align:center; padding:36px 16px 48px; max-width:820px; margin:0 auto; border-top:1px solid var(--border); margin-top:24px; }
.footer-author { font-size:15px; color:var(--text-soft); line-height:1.9; }
.footer-author strong { display:block; font-size:22px; font-weight:700; color:var(--accent-text); letter-spacing:.4px; margin-top:4px; }
.footer-source { font-size:13px; color:var(--text-dim); margin-top:12px; font-family:var(--font-en); font-style:italic; }

/* Scrollbar */
::-webkit-scrollbar { width:7px; }
::-webkit-scrollbar-track { background:transparent; }
::-webkit-scrollbar-thumb { background:var(--border); border-radius:8px; }

/* Mobile */
@media (max-width:560px) {
  .calc-grid { grid-template-columns:1fr; }
  .result-box { grid-template-columns:1fr; }
  #drugName { font-size:20px; }
  .route-btn { padding:8px 14px; font-size:13px; }
}