:root {
  --bg:#f6f7fb; --card:#fff; --text:#1b1f2a; --muted:#667085;
  --pri:#4f46e5; --pri-dk:#4338ca; --ok:#10b981; --bad:#ef4444;
  --br:14px; --sh:0 2px 10px rgba(20,20,43,.06);
}
*{box-sizing:border-box} html,body{margin:0;padding:0}
body{font:16px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  background:var(--bg);color:var(--text);padding-bottom:72px}
a{color:var(--pri);text-decoration:none}
.container{max-width:560px;margin:0 auto;padding:16px}

/* Header */
header{background:#fff;border-bottom:1px solid #eaecf0;position:sticky;top:0;z-index:10}
header .row{display:flex;align-items:center;justify-content:space-between;
  max-width:560px;margin:0 auto;padding:12px 16px}
header h1{font-size:18px;margin:0}
.lang-switch{display:flex;gap:4px}
.lang-switch a{padding:4px 8px;border-radius:6px;font-size:13px;color:var(--muted)}
.lang-switch a.active{background:var(--pri);color:#fff}

/* Bottom nav (mobile) */
nav.bottom{position:fixed;bottom:0;left:0;right:0;background:#fff;
  border-top:1px solid #eaecf0;display:flex;justify-content:space-around;
  padding:8px 0 max(8px,env(safe-area-inset-bottom));z-index:10}
nav.bottom a{flex:1;text-align:center;color:var(--muted);font-size:12px;padding:4px}
nav.bottom a.active{color:var(--pri)}
nav.bottom .ico{display:block;font-size:22px;line-height:1}

/* Cards & buttons */
.card{background:var(--card);border-radius:var(--br);box-shadow:var(--sh);padding:20px;margin-bottom:16px}
.btn{display:inline-block;background:var(--pri);color:#fff;padding:12px 18px;
  border-radius:10px;border:0;font-size:16px;cursor:pointer;width:100%;
  text-align:center;font-weight:600}
.btn:active{background:var(--pri-dk)}
.btn.secondary{background:#eef2ff;color:var(--pri)}
.btn.ok{background:var(--ok)} .btn.bad{background:var(--bad)}
.btn-row{display:flex;gap:10px}
.btn-row .btn{flex:1}
input,select{width:100%;padding:12px;border:1px solid #d0d5dd;border-radius:10px;
  font-size:16px;margin-bottom:12px;background:#fff}
input:focus,select:focus{outline:2px solid var(--pri);border-color:var(--pri)}
label{display:block;font-size:13px;color:var(--muted);margin-bottom:4px}

/* Hero / stats */
.hero{text-align:center;padding:24px 16px}
.hero h2{font-size:26px;margin:0 0 8px}
.hero p{color:var(--muted);margin:0 0 18px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:16px}
.stat{background:#fff;border-radius:var(--br);padding:14px;text-align:center;box-shadow:var(--sh)}
.stat b{display:block;font-size:22px;color:var(--pri)}
.stat span{font-size:12px;color:var(--muted)}

/* Flashcard */
.flash{min-height:220px;display:flex;flex-direction:column;align-items:center;
  justify-content:center;text-align:center}
.flash .term{font-size:34px;font-weight:700;margin:0 0 8px}
.flash .ipa{color:var(--muted);font-size:14px;margin-bottom:12px}
.flash .trans{font-size:22px;color:var(--pri);margin:0 0 10px}
.flash .ex{color:var(--muted);font-style:italic;font-size:14px}
.badge{display:inline-block;padding:2px 8px;border-radius:999px;
  background:#eef2ff;color:var(--pri);font-size:12px;margin-left:6px}

/* Grammar */
.lesson-list a{display:block;background:#fff;padding:14px;border-radius:var(--br);
  box-shadow:var(--sh);margin-bottom:10px;color:var(--text)}
.lesson-list a small{color:var(--muted);display:block}
.quiz .choice{display:block;width:100%;padding:14px;border:1px solid #d0d5dd;
  border-radius:10px;background:#fff;text-align:left;margin-bottom:8px;font-size:16px;cursor:pointer}
.quiz .choice:active{border-color:var(--pri)}
.quiz .choice.correct{background:#d1fae5;border-color:var(--ok)}
.quiz .choice.wrong{background:#fee2e2;border-color:var(--bad)}

.alert{padding:12px;border-radius:10px;margin-bottom:12px}
.alert.err{background:#fee2e2;color:#991b1b}
.alert.ok{background:#d1fae5;color:#065f46}

/* Progress bar */
.progress{height:10px;background:#eef2ff;border-radius:999px;overflow:hidden}
.progress-bar{height:100%;background:var(--pri);transition:width .3s ease}

/* Speak button */
.speak-btn{background:none;border:0;cursor:pointer;font-size:20px;padding:2px 8px;
  border-radius:6px;vertical-align:middle}
.speak-btn:active{background:#eef2ff}

/* Mode switch (vocab) */
.mode-switch{display:flex;gap:4px;margin-bottom:16px;background:#fff;
  padding:6px;border-radius:14px;box-shadow:var(--sh);align-items:stretch}
.mode-switch a{flex:1 1 0;display:flex;flex-direction:column;align-items:center;
  justify-content:center;gap:6px;padding:10px 6px;border-radius:10px;
  color:var(--muted);font-weight:500;min-width:0;text-decoration:none;
  box-sizing:border-box;min-height:64px}
.mode-switch a svg{width:20px;height:20px;flex-shrink:0;display:block}
.mode-switch a .lbl{font-size:12px;text-align:center;line-height:1;white-space:nowrap}
.mode-switch a.active{background:var(--pri);color:#fff}

/* Ensure buttons keep consistent width */
.btn{box-sizing:border-box}
.btn-row{width:100%}
.btn-row > .btn{min-width:0}

/* Admin lists */
.admin-list{list-style:none;padding:0;margin:0}
.admin-list li{display:flex;justify-content:space-between;align-items:center;
  padding:12px 0;border-bottom:1px solid #eaecf0}
.admin-list li:last-child{border-bottom:0}
.row-actions{display:flex;gap:12px;font-size:14px}
.row-actions a{color:var(--pri)}

/* Leaderboard */
.board{list-style:none;padding:0;margin:0;counter-reset:rank}
.board li{display:flex;align-items:center;gap:12px;padding:10px 0;
  border-bottom:1px solid #eaecf0}
.board li:last-child{border-bottom:0}
.board li.me{background:#eef2ff;margin:0 -20px;padding:10px 20px;border-radius:8px}
.board .rank{color:var(--muted);font-weight:600;width:28px}
.board .name{flex:1;font-weight:500}
.board .score{font-weight:700;color:var(--pri)}

textarea{font-family:inherit;font-size:14px}

/* Users table */
.users-table{width:100%;border-collapse:collapse;font-size:14px}
.users-table th{text-align:left;padding:8px 6px;font-size:12px;color:var(--muted);
  border-bottom:2px solid #eaecf0;font-weight:600;text-transform:uppercase}
.users-table td{padding:10px 6px;border-bottom:1px solid #eaecf0;vertical-align:top}
.users-table tr:last-child td{border-bottom:0}
.users-table .badge{background:#fee2e2;color:#991b1b;margin-left:4px;font-size:11px}

/* Logout button in header */
.logout-btn{font-size:20px;padding:4px 8px;border-radius:6px;text-decoration:none}
.logout-btn:active{background:#fee2e2}

/* Direction buttons (reverse mode) */
.dir-btn{flex:1;padding:8px;border-radius:8px;background:#eef2ff;color:var(--muted);
  text-align:center;font-size:13px;font-weight:500}
.dir-btn.active{background:var(--pri);color:#fff}

/* Badge grid */
.badge-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.badge-item{text-align:center;padding:12px 6px;border-radius:10px;background:#f9fafb}
.badge-item.earned{background:#eef2ff}
.badge-item.locked{opacity:.5}
.badge-icon{font-size:32px;line-height:1}
.badge-name{font-size:11px;margin-top:6px;color:var(--muted)}
.badge-item.earned .badge-name{color:var(--text);font-weight:500}