:root{
  --bg:#f4f7fb; --paper:#ffffff; --ink:#15233a; --mute:#5a6a82;
  --blue:#0a4f9c; --blue-deep:#073a73; --sky:#3fa0d6; --red:#e8172b; --red-deep:#b80f20;
  --sun:#f2b705; --sun-ink:#4a3700;
  --ok:#1f8a4c; --bad:#c0392b; --line:#d6dfeb;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0f1824; --paper:#192536; --ink:#eef2f7; --mute:#a3b1c4;
    --blue:#3b8ad9; --blue-deep:#2b6fb3; --sky:#5fb4e6; --red:#ff4d5c; --red-deep:#e03646;
    --ok:#4ec47f; --bad:#e06555; --line:#2b3a4f; color-scheme:dark;
  }
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{height:100%}
body{margin:0;min-height:100%;background:var(--bg);color:var(--ink);
  font-family:"Nunito","Segoe UI",system-ui,sans-serif;font-weight:600;font-size:20px;line-height:1.35;
  -webkit-tap-highlight-color:transparent;
  padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
#app{max-width:520px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column;padding:16px 16px 24px}
h1,h2{font-weight:800;margin:0}
h1{font-size:30px;line-height:1.15}
h2{font-size:24px}
p{margin:0}
.mute{color:var(--mute);font-size:17px}
button{font:inherit;color:inherit;cursor:pointer;border:0;border-radius:18px}
button:focus-visible,input:focus-visible{outline:4px solid var(--sun);outline-offset:2px}
.btn{display:block;width:100%;padding:20px;font-size:24px;font-weight:800;text-align:center}
.btn-main{background:var(--blue);color:#fff}
.btn-main:active{background:var(--blue-deep)}
.btn-main[disabled]{opacity:.55;cursor:default}
.btn-sun{background:var(--sun);color:var(--sun-ink)}
.btn-red{background:var(--red);color:#fff}
.btn-red:active{background:var(--red-deep)}
.btn-red[disabled]{opacity:.45;cursor:default}
.btn-ghost{background:transparent;color:var(--mute);font-size:18px;padding:12px}
.stack{display:flex;flex-direction:column;gap:14px}
.grow{flex:1}
input{font:inherit;font-size:26px;font-weight:800;width:100%;padding:16px;border-radius:14px;
  border:3px solid var(--line);background:var(--paper);color:var(--ink);letter-spacing:.08em}
label{display:block;font-size:18px;color:var(--mute);margin-bottom:6px}

/* login */
.logo{display:block;width:170px;max-width:60%;margin:0 auto 10px}
.slogan{text-align:center}
.slogan h1{color:var(--blue)}
.slogan h1 span{color:var(--red)}
.pill{display:inline-block;background:var(--paper);border:2px solid var(--line);border-radius:999px;padding:6px 14px;font-size:15px;color:var(--mute)}

/* home */
.top{display:flex;justify-content:space-between;align-items:center;gap:10px}
.streak{background:var(--paper);border:3px solid var(--line);border-radius:999px;padding:8px 16px;font-weight:800}
.unit{background:var(--paper);border:3px solid var(--line);border-radius:18px;padding:16px;display:flex;gap:14px;align-items:center}
.unit .ico{font-size:40px;width:56px;text-align:center}
.unit .bar{height:12px;background:var(--line);border-radius:6px;overflow:hidden;margin-top:8px}
.unit .bar i{display:block;height:100%;background:var(--sky);border-radius:6px}
.unit.locked{opacity:.5}
.big-due{text-align:center;padding:10px 0 4px}
.big-due b{font-size:64px;line-height:1;color:var(--blue);display:block}
.sync{text-align:center;font-size:15px;color:var(--mute)}

/* session */
.prog{height:14px;background:var(--line);border-radius:7px;overflow:hidden}
.prog i{display:block;height:100%;background:var(--sun);border-radius:7px;transition:width .3s}
.card{background:var(--paper);border:3px solid var(--line);border-radius:24px;padding:24px 20px;text-align:center}
.card .pic{font-size:96px;line-height:1.1}
.card .en{font-size:40px;font-weight:800;line-height:1.1;margin-top:8px}
.card .es{font-size:22px;color:var(--mute);margin-top:4px}
.card .phrase{margin-top:14px;font-size:20px;border-top:2px dashed var(--line);padding-top:12px}
.speak{display:inline-flex;align-items:center;gap:10px;background:var(--sun);color:var(--sun-ink);
  padding:16px 28px;font-size:24px;font-weight:800;margin-top:16px}
.speak:active{transform:scale(.97)}
.q{font-size:22px;text-align:center}
.q .pic{font-size:88px;line-height:1.1}
.q .big{font-size:38px;font-weight:800;line-height:1.1}
.opts{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.opt{background:var(--paper);border:3px solid var(--line);padding:18px 8px;font-size:22px;font-weight:800;min-height:84px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px}
.opt .pic{font-size:52px;line-height:1}
.opt.ok{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 18%,var(--paper))}
.opt.bad{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 18%,var(--paper))}
.opt[disabled]{cursor:default}
.feedback{text-align:center;font-size:24px;font-weight:800;min-height:34px}
.feedback.ok{color:var(--ok)} .feedback.bad{color:var(--bad)}
.done{text-align:center}
.done .pic{font-size:96px}
.done .n{font-size:56px;font-weight:800;color:var(--blue);line-height:1}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* speaking */
.mic{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;width:100%;
  padding:22px 16px;background:var(--red);color:#fff;font-size:22px;font-weight:800;border-radius:24px}
.mic .ico{font-size:48px;line-height:1}
.mic:active{background:var(--red-deep)}
.mic.listening{background:var(--red-deep);animation:pulse 1s ease-in-out infinite}
.mic.good{background:var(--ok)}
.mic[disabled]{cursor:default}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 color-mix(in srgb,var(--red) 55%,transparent)}50%{box-shadow:0 0 0 14px transparent}}

/* pronunciation */
.say{margin-top:8px;font-size:20px;color:var(--blue)}
.say b{letter-spacing:.04em}
.tip{margin-top:6px;font-size:16px;color:var(--mute);text-align:left;background:color-mix(in srgb,var(--sun) 18%,var(--paper));border-radius:10px;padding:8px 10px}
.row{display:flex;gap:10px;justify-content:center}
.row .speak{padding:12px 8px;font-size:19px;margin-top:12px;flex:1;justify-content:center;white-space:nowrap;gap:6px}
.card.compact{padding:16px 16px}
.card.compact .pic{font-size:72px}
.card.compact .en{font-size:34px}
.speak.slow{background:var(--paper);color:var(--ink);border:3px solid var(--line)}
.corr{text-align:left;font-size:19px;font-weight:600;color:var(--ink);background:var(--paper);border:3px solid var(--line);border-radius:14px;padding:10px 12px}
.corr .w{padding:0 4px;border-radius:6px;font-weight:800}
.corr .w.ok{color:var(--ok)} .corr .w.bad{color:var(--bad);background:color-mix(in srgb,var(--bad) 14%,var(--paper))}
.feedback.ok,.feedback.bad{min-height:0}

/* levels */
.lvl{background:var(--paper);border:3px solid var(--line);border-radius:18px;padding:14px;display:flex;flex-direction:column;gap:10px}
.lvl.now{border-color:var(--blue)}
.lvl.locked{opacity:.6}
.lvl.done{opacity:.85}
.lvl .unit{border-width:2px;padding:12px}
.lvl-head{display:flex;align-items:center;gap:10px}
.lvl-head b{flex:1;font-size:20px}
.badge{display:inline-block;background:var(--blue);color:#fff;border-radius:999px;padding:4px 12px;font-size:15px;font-weight:800}
.lvl.locked .badge{background:var(--mute)}
.pct{font-weight:800;color:var(--blue)}
.bar{height:12px;background:var(--line);border-radius:6px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--sky);border-radius:6px}
.bar.big{height:16px}
.bar.big i{background:var(--blue)}
.en.long,.big.long{font-size:28px!important;line-height:1.2}
.es-big{font-size:26px!important}

/* word order */
.built{min-height:64px;background:var(--paper);border:3px dashed var(--line);border-radius:16px;padding:10px;display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:center}
.chips{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.chip{background:var(--paper);border:3px solid var(--line);border-radius:14px;padding:12px 16px;font-size:21px;font-weight:800}
.chip.used{opacity:.25}
.chip.in{background:color-mix(in srgb,var(--sky) 18%,var(--paper));border-color:var(--sky)}
.chip.ok{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 18%,var(--paper))}
.chip.bad{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 18%,var(--paper))}
.btn-sun[disabled]{opacity:.5;cursor:default}