:root{
  --green:#0b3d2e; --green2:#13624a; --accent:#1fb47a; --hot:#ff5a4d;
  --bg:#f4f6f5; --card:#fff; --ink:#16231e; --muted:#6b7d76; --line:#e3e9e6;
  --ok:#1fb47a; --bad:#ff5a4d; --warn:#f5a623; --gold:#ffce54;
  --shadow:0 2px 12px rgba(0,0,0,.07);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;font-size:16px}
.hidden{display:none!important}

.app-header{position:sticky;top:0;z-index:50;background:var(--green);color:#fff;
  padding:14px 16px;display:flex;align-items:center;justify-content:space-between;box-shadow:var(--shadow)}
.brand{font-weight:800;font-size:18px;letter-spacing:.2px}
.header-sub{font-size:12px;opacity:.8}

.view{padding:16px 16px 92px;max-width:760px;margin:0 auto;min-height:60vh}

.tabbar{position:fixed;bottom:0;left:0;right:0;z-index:50;background:#fff;border-top:1px solid var(--line);
  display:flex;justify-content:space-around;padding:6px 2px;padding-bottom:max(6px,env(safe-area-inset-bottom))}
.tabbar a{flex:1;text-align:center;text-decoration:none;color:var(--muted);font-size:20px;
  display:flex;flex-direction:column;align-items:center;gap:2px;padding:4px 0;border-radius:10px}
.tabbar a span{font-size:10px;font-weight:600}
.tabbar a.active{color:var(--green);background:#eef5f1}
.tabbar a.hot span{color:var(--hot)}

.card{background:var(--card);border-radius:16px;padding:18px;box-shadow:var(--shadow);margin-bottom:14px}
.card h2{margin:0 0 4px;font-size:18px}
.card h3{margin:0 0 10px;font-size:15px;color:var(--muted);font-weight:600}
.muted{color:var(--muted)}
.center{text-align:center}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;cursor:pointer;
  background:var(--green);color:#fff;font-weight:700;font-size:16px;padding:14px 18px;border-radius:14px;width:100%;
  transition:transform .05s,opacity .2s}
.btn:active{transform:scale(.98)}
.btn.sec{background:#eef5f1;color:var(--green)}
.btn.hot{background:var(--hot)}
.btn.ghost{background:transparent;color:var(--green);border:2px solid var(--line)}
.btn.small{width:auto;padding:10px 14px;font-size:14px;border-radius:12px}
.btn[disabled]{opacity:.45;pointer-events:none}
.btn-row{display:flex;gap:10px}
.btn-row .btn{width:auto;flex:1}

/* dashboard scores */
.scores{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.score-tile{background:var(--card);border-radius:14px;padding:14px;box-shadow:var(--shadow);position:relative;overflow:hidden}
.score-tile .lab{font-size:13px;color:var(--muted);font-weight:600}
.score-tile .val{font-size:30px;font-weight:800;margin-top:2px}
.score-tile .goal{font-size:11px;color:var(--muted)}
.score-tile .bar{height:7px;border-radius:6px;background:var(--line);margin-top:8px;overflow:hidden}
.score-tile .bar i{display:block;height:100%;border-radius:6px}
.tag{display:inline-block;font-size:11px;font-weight:700;padding:3px 8px;border-radius:20px;margin-top:8px}
.tag.red{background:#ffe7e4;color:#d33}.tag.yellow{background:#fff3da;color:#a76b00}.tag.green{background:#e2f6ee;color:#0c7a55}

.gap-row{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid var(--line)}
.gap-row:last-child{border:none}
.gap-row .em{font-size:22px}
.gap-row .info{flex:1}
.gap-row .info b{font-size:15px}
.gap-row .info small{display:block;color:var(--muted)}

/* speaking */
.mic-stage{text-align:center;padding:10px 0}
.mic-btn{width:96px;height:96px;border-radius:50%;border:none;background:var(--hot);color:#fff;font-size:38px;
  box-shadow:0 6px 24px rgba(255,90,77,.4);cursor:pointer;transition:transform .1s}
.mic-btn:active{transform:scale(.95)}
.mic-btn.rec{animation:pulse 1s infinite;background:#d33}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(211,51,51,.5)}70%{box-shadow:0 0 0 18px rgba(211,51,51,0)}100%{box-shadow:0 0 0 0 rgba(211,51,51,0)}}
.phrase-box{font-size:22px;font-weight:700;line-height:1.4;padding:16px;background:#eef5f1;border-radius:14px;margin:12px 0}
.words-eval{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;margin:10px 0}
.words-eval .w{padding:4px 9px;border-radius:8px;font-weight:600;font-size:16px}
.words-eval .w.ok{background:#e2f6ee;color:#0c7a55}
.words-eval .w.bad{background:#ffe7e4;color:#d33;text-decoration:line-through}
.score-pills{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:10px 0}
.pill{background:#f0f3f1;border-radius:20px;padding:6px 12px;font-size:13px;font-weight:600}
.pill b{color:var(--green)}
.bigband{font-size:46px;font-weight:800;text-align:center;color:var(--green)}
.countdown{font-size:64px;font-weight:800;text-align:center;color:var(--hot)}
.mode-badge{font-size:11px;font-weight:700;padding:3px 9px;border-radius:20px;background:#eef5f1;color:var(--green2)}
.mode-badge.fb{background:#fff3da;color:#a76b00}

/* segmented */
.seg{display:flex;background:#eef1ef;border-radius:12px;padding:4px;margin-bottom:14px}
.seg button{flex:1;border:none;background:transparent;padding:9px;border-radius:9px;font-weight:700;color:var(--muted);cursor:pointer;font-size:13px}
.seg button.on{background:#fff;color:var(--green);box-shadow:var(--shadow)}

/* options / questions */
.opt{display:block;width:100%;text-align:left;padding:13px 14px;border:2px solid var(--line);border-radius:12px;
  background:#fff;margin-bottom:8px;font-size:15px;cursor:pointer}
.opt.sel{border-color:var(--green)}
.opt.ok{border-color:var(--ok);background:#e2f6ee}
.opt.bad{border-color:var(--bad);background:#ffe7e4}
.passage{font-size:16px;line-height:1.6;white-space:pre-wrap}
textarea{width:100%;min-height:150px;border:2px solid var(--line);border-radius:12px;padding:12px;font-size:15px;font-family:inherit;resize:vertical}
.chip{display:inline-block;padding:9px 13px;background:#eef5f1;border:2px solid var(--line);border-radius:10px;margin:4px;font-size:16px;cursor:pointer;user-select:none}
.chip:active{transform:scale(.96)}
.chip.used{opacity:.3;pointer-events:none}
.build-target{min-height:54px;border:2px dashed var(--line);border-radius:12px;padding:10px;margin:10px 0;display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.build-target .chip{background:var(--green);color:#fff;border-color:var(--green)}

.fb-block{background:#f7faf9;border-left:4px solid var(--accent);border-radius:8px;padding:12px;margin:10px 0;font-size:14px;line-height:1.5}
.fb-block b{color:var(--green)}
.loader{text-align:center;padding:30px;color:var(--muted)}
.spin{width:30px;height:30px;border:3px solid var(--line);border-top-color:var(--green);border-radius:50%;animation:sp 1s linear infinite;margin:0 auto 10px}
@keyframes sp{to{transform:rotate(360deg)}}

.progress-bar{height:10px;background:var(--line);border-radius:6px;overflow:hidden}
.progress-bar i{display:block;height:100%;background:var(--accent)}
.chart{width:100%;height:200px}
.offline-banner{position:fixed;top:0;left:0;right:0;z-index:99;background:var(--warn);color:#3a2a00;text-align:center;padding:8px;font-size:13px;font-weight:600}

.flash-card{min-height:200px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;cursor:pointer}
.flash-card .word{font-size:32px;font-weight:800}
.flash-card .sub{color:var(--muted);margin-top:6px}
.flash-card .back{margin-top:14px;font-size:16px;line-height:1.5}
.kbd{font-size:12px;color:var(--muted);margin-top:6px}
.timer{font-weight:800;color:var(--hot)}

/* settings */
.gear-btn{background:rgba(255,255,255,.15);border:none;color:#fff;font-size:18px;width:38px;height:38px;border-radius:10px;cursor:pointer}
.gear-btn:active{transform:scale(.94)}
.set-row{padding:12px 0;border-bottom:1px solid var(--line)}
.set-row:last-child{border:none}
.set-row>label{display:block;font-weight:700;font-size:14px;margin-bottom:8px}
.pick-grid{display:flex;flex-wrap:wrap;gap:8px}
.opt-pick{border:2px solid var(--line);background:#fff;border-radius:10px;padding:9px 13px;font-size:14px;font-weight:600;cursor:pointer;color:var(--ink)}
.opt-pick.on{border-color:var(--green);background:#eef5f1;color:var(--green)}
.opt-pick:active{transform:scale(.96)}
select,input[type=number]{border:2px solid var(--line);border-radius:10px;padding:10px;font-size:15px;font-family:inherit;background:#fff;width:100%;max-width:100%}
input[type=number]{width:90px}