/* ==========================================================================
   Nativo — design system
   Pronunciation-first English for Brazilian Portuguese speakers.
   Dark studio for the lesson player, warm paper for editorial surfaces.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,300;9..144,400;9..144,600;9..144,700&family=Inter:wght@400;500;600;700;800&display=swap');

:root{
  /* surfaces */
  --ink:#0D0E12;
  --ink-2:#15171D;
  --ink-3:#1F222A;
  --line-d:#2A2E38;

  --paper:#FAF7F2;
  --paper-2:#F1ECE3;
  --line-l:#E2DACD;

  /* type */
  --tx-d:#F2EEE7;
  --tx-d-mute:#9A9384;
  --tx-l:#16171B;
  --tx-l-mute:#6E6759;

  /* signal */
  --accent:#FF5A3C;
  --accent-dim:#C2412A;
  --gold:#E8B44A;
  --ok:#2FA36B;
  --ok-dim:#1D6B46;
  --no:#E0553E;

  --serif:'Fraunces',Georgia,serif;
  --sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;

  --r-s:10px; --r-m:16px; --r-l:24px; --r-xl:34px;
  --ease:cubic-bezier(.22,.9,.3,1);
  --wrap:1120px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--sans);
  background:var(--ink);
  color:var(--tx-d);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
a{color:inherit}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.wrap-n{max-width:760px;margin:0 auto;padding:0 24px}

/* ---------- type scale ---------- */
.d1{font-family:var(--serif);font-weight:300;font-size:clamp(42px,7.4vw,92px);line-height:.98;letter-spacing:-.025em}
.d2{font-family:var(--serif);font-weight:300;font-size:clamp(31px,4.4vw,54px);line-height:1.06;letter-spacing:-.02em}
.d3{font-family:var(--serif);font-weight:400;font-size:clamp(23px,2.7vw,33px);line-height:1.18;letter-spacing:-.01em}
.lede{font-size:clamp(16.5px,1.75vw,20px);line-height:1.62;color:var(--tx-d-mute)}
.eyebrow{font-size:11px;font-weight:800;letter-spacing:.17em;text-transform:uppercase;color:var(--accent)}
.ipa{font-feature-settings:"kern";letter-spacing:.02em;white-space:nowrap}

.on-paper{background:var(--paper);color:var(--tx-l)}
.on-paper .lede{color:var(--tx-l-mute)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:15px 30px;border-radius:100px;
  font-size:15px;font-weight:700;letter-spacing:.005em;
  transition:transform .18s var(--ease),background .18s,box-shadow .18s,opacity .18s;
  white-space:nowrap;
}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 8px 26px rgba(255,90,60,.32)}
.btn-primary:hover{background:#ff6d52;box-shadow:0 12px 34px rgba(255,90,60,.42)}
.btn-ghost{border:1px solid var(--line-d);color:var(--tx-d)}
.btn-ghost:hover{background:var(--ink-3);border-color:#3b414e}
.btn-paper{background:var(--ink);color:var(--paper)}
.btn-paper:hover{background:#22242c}
.btn[disabled]{opacity:.4;pointer-events:none}
.btn-lg{padding:18px 38px;font-size:16.5px}

/* ---------- landing ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:60;
  display:flex;align-items:center;justify-content:space-between;
  padding:18px 28px;
  background:rgba(13,14,18,.72);backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;transition:border-color .3s;
}
.nav.stuck{border-bottom-color:var(--line-d)}
.logo{font-family:var(--serif);font-size:23px;font-weight:400;letter-spacing:-.01em;display:flex;align-items:center;gap:9px}
.logo .dot{width:8px;height:8px;border-radius:50%;background:var(--accent);animation:pulse 2.6s var(--ease) infinite}
@keyframes pulse{0%,100%{transform:scale(1);opacity:1}50%{transform:scale(1.55);opacity:.5}}

.hero{position:relative;min-height:100svh;display:flex;align-items:center;padding:120px 0 70px;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.42}
.hero-bg::after{content:'';position:absolute;inset:0;background:linear-gradient(100deg,var(--ink) 22%,rgba(13,14,18,.82) 52%,rgba(13,14,18,.45) 100%)}
.hero-in{position:relative;z-index:1;max-width:730px}
.hero h1{margin:16px 0 22px}
.hero h1 em{font-style:italic;color:var(--accent)}
.hero-cta{display:flex;gap:13px;flex-wrap:wrap;margin-top:34px}
.hero-note{margin-top:22px;font-size:13px;color:var(--tx-d-mute)}

/* the two-vowel demo strip */
.vstrip{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:46px;max-width:520px}
.vcard{
  background:var(--ink-2);border:1px solid var(--line-d);border-radius:var(--r-m);
  padding:19px 21px;transition:transform .2s var(--ease),border-color .2s;cursor:pointer;
}
.vcard:hover{transform:translateY(-3px);border-color:var(--accent)}
.vcard .w{font-family:var(--serif);font-size:31px;line-height:1}
.vcard .p{font-size:14px;color:var(--accent);margin-top:5px;font-weight:600}
.vcard .t{font-size:12.5px;color:var(--tx-d-mute);margin-top:9px}

/* ---------- sections ---------- */
.sec{padding:96px 0}
.sec-head{max-width:660px;margin-bottom:52px}
.sec-head .d2{margin:13px 0 16px}

.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(268px,1fr));gap:20px}
.card{
  background:var(--ink-2);border:1px solid var(--line-d);border-radius:var(--r-l);
  padding:30px 28px;transition:transform .22s var(--ease),border-color .22s;
}
.card:hover{transform:translateY(-4px);border-color:#3b414e}
.card .n{font-family:var(--serif);font-size:41px;color:var(--accent);line-height:1;opacity:.9}
.card h3{font-size:19px;font-weight:700;margin:15px 0 9px;letter-spacing:-.01em}
.card p{font-size:14.5px;color:var(--tx-d-mute);line-height:1.6}

/* course map */
.mod{border-top:1px solid var(--line-l);padding:34px 0}
.mod-h{display:flex;align-items:baseline;gap:15px;margin-bottom:22px;flex-wrap:wrap}
.mod-h .k{font-size:11px;font-weight:800;letter-spacing:.15em;text-transform:uppercase;color:var(--accent)}
.lrow{
  display:grid;grid-template-columns:52px 1fr auto;gap:19px;align-items:center;
  padding:17px 20px;border-radius:var(--r-m);transition:background .18s;
  border:1px solid transparent;
}
.lrow:hover{background:var(--paper-2)}
.lrow.live{background:var(--paper-2);border-color:var(--line-l)}
.lrow .num{font-family:var(--serif);font-size:27px;color:var(--tx-l-mute)}
.lrow .ti{font-size:16.5px;font-weight:700;letter-spacing:-.005em}
.lrow .sub{font-size:13.5px;color:var(--tx-l-mute);margin-top:3px}
.pill{font-size:10.5px;font-weight:800;letter-spacing:.09em;text-transform:uppercase;padding:6px 13px;border-radius:100px;white-space:nowrap}
.pill-live{background:var(--ink);color:#fff}
.pill-soon{background:var(--line-l);color:var(--tx-l-mute)}

/* ==========================================================================
   LESSON PLAYER
   ========================================================================== */
.player{min-height:100svh;display:flex;flex-direction:column;background:var(--ink)}

.pbar{
  position:sticky;top:0;z-index:50;background:rgba(13,14,18,.9);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line-d);
}
.pbar-in{display:flex;align-items:center;gap:18px;padding:14px 24px;max-width:var(--wrap);margin:0 auto}
.pbar .back{font-size:13.5px;color:var(--tx-d-mute);display:flex;align-items:center;gap:7px;transition:color .16s;text-decoration:none}
.pbar .back:hover{color:var(--tx-d)}
.pbar .ti{font-size:14px;font-weight:700;flex:1;text-align:center}
.pbar .ti span{color:var(--tx-d-mute);font-weight:500}

.beats{display:flex;gap:5px;padding:0 24px 13px;max-width:var(--wrap);margin:0 auto;width:100%}
.bdot{flex:1;height:4px;border-radius:4px;background:var(--ink-3);overflow:hidden;position:relative}
.bdot i{position:absolute;inset:0;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .5s var(--ease)}
.bdot.done i{transform:scaleX(1)}
.bdot.now i{transform:scaleX(.5);background:linear-gradient(90deg,var(--accent),var(--gold))}

.stage{flex:1;display:flex;align-items:flex-start;justify-content:center;padding:52px 24px 120px}
.beat{max-width:720px;width:100%;animation:rise .5s var(--ease) both}
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.beat-k{display:flex;align-items:center;gap:11px;margin-bottom:20px}
.beat-k .n{
  width:31px;height:31px;border-radius:50%;background:var(--accent);color:#fff;
  display:grid;place-items:center;font-size:14px;font-weight:800;flex:none;
}
.beat-k .l{font-size:11.5px;font-weight:800;letter-spacing:.15em;text-transform:uppercase;color:var(--accent)}
.beat h2{font-family:var(--serif);font-weight:300;font-size:clamp(29px,4vw,44px);line-height:1.08;letter-spacing:-.02em;margin-bottom:22px}
.beat p{font-size:16.5px;line-height:1.66;color:#CFC9BC;margin-bottom:15px}
.beat p strong{color:var(--tx-d);font-weight:700}
.beat p em{color:var(--gold);font-style:italic}

.beat-art{border-radius:var(--r-l);overflow:hidden;margin:26px 0 30px;border:1px solid var(--line-d);position:relative}
.beat-art img{width:100%;aspect-ratio:16/9;object-fit:cover}

/* trap cards */
.trap{
  display:grid;grid-template-columns:1fr auto 1fr;gap:16px;align-items:stretch;
  background:var(--ink-2);border:1px solid var(--line-d);border-radius:var(--r-l);
  padding:23px;margin-bottom:15px;
}
.trap-w{text-align:center;padding:9px 6px}
.trap-w .w{font-family:var(--serif);font-size:clamp(25px,4vw,36px);line-height:1.05}
.trap-w .i{font-size:14px;color:var(--gold);margin-top:5px}
.trap-w .m{font-size:13px;color:var(--tx-d-mute);margin-top:7px}
.trap-w.safe .w{color:var(--ok)}
.trap-w.danger .w{color:var(--no)}
.trap-x{display:grid;place-items:center;color:var(--tx-d-mute);font-size:21px;opacity:.5}
.trap-note{grid-column:1/-1;border-top:1px solid var(--line-d);margin-top:8px;padding-top:14px;font-size:14px;color:var(--tx-d-mute);line-height:1.6}

/* audio button */
.play{
  display:inline-flex;align-items:center;gap:11px;
  background:var(--ink-3);border:1px solid var(--line-d);border-radius:100px;
  padding:11px 21px;font-size:14.5px;font-weight:600;transition:all .18s var(--ease);
}
.play:hover{border-color:var(--accent);background:#262a34}
.play.on{border-color:var(--accent);background:rgba(255,90,60,.14)}
.play .ic{width:19px;height:19px;flex:none}

/* perception A/B */
.ab{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:26px 0}
.ab button{
  background:var(--ink-2);border:1.5px solid var(--line-d);border-radius:var(--r-m);
  padding:26px 18px;text-align:center;transition:all .18s var(--ease);
}
.ab button:hover:not(:disabled){border-color:var(--accent);transform:translateY(-3px)}
.ab button .w{font-family:var(--serif);font-size:29px;line-height:1.05}
.ab button .m{font-size:12.5px;color:var(--tx-d-mute);margin-top:6px}
.ab button.right{border-color:var(--ok);background:rgba(47,163,107,.14)}
.ab button.wrong{border-color:var(--no);background:rgba(224,85,62,.13)}
.ab button:disabled{cursor:default}

.verdict{
  border-radius:var(--r-m);padding:16px 19px;font-size:15px;line-height:1.6;
  margin:18px 0;animation:rise .34s var(--ease) both;
}
.verdict.ok{background:rgba(47,163,107,.13);border:1px solid rgba(47,163,107,.42);color:#9FE0BF}
.verdict.no{background:rgba(224,85,62,.11);border:1px solid rgba(224,85,62,.38);color:#F3B5A6}
.verdict.info{background:var(--ink-2);border:1px solid var(--line-d);color:var(--tx-d-mute)}
.verdict strong{color:#fff;font-weight:700}

.counter{font-size:13px;color:var(--tx-d-mute);font-weight:600;letter-spacing:.04em}

/* mechanics */
.mech{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:28px 0}
.mech-c{background:var(--ink-2);border:1px solid var(--line-d);border-radius:var(--r-l);padding:24px;overflow:hidden}
.mech-c .ipa-big{font-family:var(--serif);font-size:44px;color:var(--gold);line-height:1}
.mech-c h4{font-size:16px;font-weight:700;margin:6px 0 16px}
.mech-c svg{width:100%;height:auto;border-radius:var(--r-s);background:#0A0B0E;margin-bottom:16px}
.mech-c ul{list-style:none;display:flex;flex-direction:column;gap:9px}
.mech-c li{font-size:14px;color:#C6C0B3;line-height:1.5;padding-left:19px;position:relative}
.mech-c li::before{content:'';position:absolute;left:0;top:8px;width:7px;height:7px;border-radius:50%;background:var(--accent)}
.mech-c .ws{display:flex;flex-wrap:wrap;gap:7px;margin-top:16px;padding-top:15px;border-top:1px solid var(--line-d)}
.mech-c .ws button{
  font-size:13px;font-weight:600;padding:7px 13px;border-radius:100px;
  background:var(--ink-3);border:1px solid var(--line-d);transition:all .16s;
}
.mech-c .ws button:hover{border-color:var(--gold);color:var(--gold)}
.keynote{background:rgba(232,180,74,.1);border:1px solid rgba(232,180,74,.32);border-radius:var(--r-m);padding:18px 21px;font-size:15.5px;line-height:1.62;color:#EBD7A9}
.keynote strong{color:#fff}

/* mic */
.mic-stage{text-align:center;padding:14px 0 4px}
.target-w{font-family:var(--serif);font-size:clamp(46px,9vw,80px);line-height:1;letter-spacing:-.02em}
.target-i{font-size:19px;color:var(--gold);margin-top:9px}
.target-m{font-size:14.5px;color:var(--tx-d-mute);margin-top:7px}

.mic-btn{
  width:96px;height:96px;border-radius:50%;background:var(--accent);
  display:grid;place-items:center;margin:30px auto 0;position:relative;
  box-shadow:0 10px 34px rgba(255,90,60,.36);transition:transform .18s var(--ease),background .2s;
}
.mic-btn:hover{transform:scale(1.05)}
.mic-btn:active{transform:scale(.95)}
.mic-btn svg{width:38px;height:38px;fill:#fff;position:relative;z-index:2}
.mic-btn.rec{background:var(--no);animation:recpulse 1.4s ease-in-out infinite}
.mic-btn.rec::after{
  content:'';position:absolute;inset:-9px;border-radius:50%;
  border:2px solid var(--no);animation:ring 1.4s var(--ease) infinite;
}
@keyframes recpulse{0%,100%{box-shadow:0 10px 34px rgba(224,85,62,.4)}50%{box-shadow:0 10px 52px rgba(224,85,62,.75)}}
@keyframes ring{0%{transform:scale(1);opacity:.85}100%{transform:scale(1.42);opacity:0}}
.mic-btn.busy{background:var(--ink-3);pointer-events:none}
.mic-hint{font-size:13.5px;color:var(--tx-d-mute);margin-top:15px;min-height:20px;text-align:center}

/* live waveform */
.wave{display:flex;align-items:center;justify-content:center;gap:3px;height:44px;margin-top:18px;opacity:0;transition:opacity .25s}
.wave.on{opacity:1}
.wave i{width:3px;background:var(--accent);border-radius:3px;height:5px;transition:height .07s linear}

/* score ring */
.score{display:flex;align-items:center;justify-content:center;gap:26px;margin:26px 0}
.ring{position:relative;width:96px;height:96px;flex:none}
.ring svg{transform:rotate(-90deg);width:100%;height:100%}
.ring circle{fill:none;stroke-width:8;stroke-linecap:round}
.ring .bg{stroke:var(--ink-3)}
.ring .fg{stroke:var(--ok);transition:stroke-dashoffset 1s var(--ease),stroke .4s}
.ring .lbl{position:absolute;inset:0;display:grid;place-items:center;font-family:var(--serif);font-size:29px}

.attempts{display:flex;gap:6px;justify-content:center;margin-top:16px;flex-wrap:wrap}
.att{width:11px;height:11px;border-radius:50%;background:var(--ink-3)}
.att.ok{background:var(--ok)}.att.no{background:var(--no)}

/* sentence rows */
.sent{background:var(--ink-2);border:1px solid var(--line-d);border-radius:var(--r-m);padding:20px 22px;margin-bottom:13px}
.sent .en{font-size:19.5px;font-weight:600;line-height:1.42;letter-spacing:-.005em}
.sent .en mark{background:none;color:var(--gold);font-weight:700}
.sent .pt{font-size:14px;color:var(--tx-d-mute);margin-top:7px}
.sent .row{display:flex;gap:10px;margin-top:15px;flex-wrap:wrap}

/* homework */
.hw-item{background:var(--ink-2);border:1px solid var(--line-d);border-radius:var(--r-m);padding:20px 22px;margin-bottom:12px}
.hw-item.done-ok{border-color:rgba(47,163,107,.5)}
.hw-item.done-no{border-color:rgba(224,85,62,.44)}
.hw-h{display:flex;align-items:center;gap:11px;margin-bottom:14px}
.hw-h .k{font-size:10.5px;font-weight:800;letter-spacing:.11em;text-transform:uppercase;color:var(--tx-d-mute)}
.hw-h .i{margin-left:auto;font-size:13px;color:var(--tx-d-mute);font-weight:600}

/* nav footer */
.pnav{
  position:fixed;bottom:0;left:0;right:0;z-index:50;
  background:rgba(13,14,18,.93);backdrop-filter:blur(14px);border-top:1px solid var(--line-d);
}
.pnav-in{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:15px 24px;max-width:var(--wrap);margin:0 auto}

/* gate / wrap-up */
.gate{background:var(--ink-2);border:1px dashed var(--line-d);border-radius:var(--r-l);padding:34px 30px;text-align:center}
.gate h3{font-family:var(--serif);font-size:25px;font-weight:400;margin-bottom:11px}
.gate p{color:var(--tx-d-mute);font-size:15px;margin-bottom:20px}

.done-hero{text-align:center;padding:18px 0}
.done-hero .big{font-family:var(--serif);font-size:clamp(52px,11vw,96px);line-height:1;color:var(--ok)}

/* login */
.login-ov{position:fixed;inset:0;z-index:200;background:var(--ink);display:grid;place-items:center;padding:24px}
.login-card{max-width:400px;width:100%;text-align:center;animation:rise .55s var(--ease) both}
.login-card .logo{justify-content:center;font-size:36px;margin-bottom:11px}
.login-card p{color:var(--tx-d-mute);font-size:15px;margin-bottom:26px}
.fld{
  width:100%;background:var(--ink-2);border:1px solid var(--line-d);border-radius:100px;
  padding:15px 22px;font-size:15.5px;color:var(--tx-d);font-family:inherit;margin-bottom:11px;text-align:center;
}
.fld:focus{outline:none;border-color:var(--accent)}
.fld::placeholder{color:#5C5749}

/* misc */
.disclose{font-size:12.5px;color:#6E6959;line-height:1.6;border-left:2px solid var(--line-d);padding-left:14px;margin-top:26px}
.foot{border-top:1px solid var(--line-d);padding:40px 0;text-align:center;font-size:13px;color:var(--tx-d-mute)}

@media(max-width:760px){
  .vstrip,.mech,.ab,.trap{grid-template-columns:1fr}
  .trap-x{display:none}
  .sec{padding:66px 0}
  .stage{padding:34px 18px 116px}
  .lrow{grid-template-columns:38px 1fr;gap:13px}
  .lrow .pill{grid-column:2;justify-self:start;margin-top:7px}
  .pbar .ti{display:none}
}
@media(prefers-reduced-motion:reduce){
  *{animation-duration:.01ms!important;transition-duration:.01ms!important}
}