:root{--text:#30411f;--muted:#6b7a57;--line:#d7e8bf;--accent:#58cc02;--accent-dark:#46a302;--accent-soft:#eaf9d7;--yellow:#ffd93d;--yellow-dark:#f4c400;--blue:#1cb0f6;--bg:#f7fff0;--card:#ffffff;--shadow:0 10px 0 rgba(0,0,0,.06),0 20px 40px rgba(50,85,20,.10);--radius:26px;--container:min(1180px,calc(100% - 32px))}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,Arial,sans-serif;color:var(--text);background:linear-gradient(180deg,#effbdc 0%,#f7fff0 16%,#fffdf6 100%)}
a{text-decoration:none;color:inherit}.container{width:var(--container);margin:0 auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(247,255,240,.86);backdrop-filter:blur(12px);border-bottom:1px solid rgba(151,193,98,.22)}
.nav{display:flex;justify-content:space-between;align-items:center;gap:20px;min-height:82px}.brand{display:flex;gap:12px;align-items:center}.brand-logo{width:46px;height:46px;display:block}.brand-text strong{display:block;font-size:1.05rem}.brand-text span{display:block;color:var(--muted);font-size:.9rem}.nav-links{display:flex;gap:10px;flex-wrap:wrap}.nav-links a{padding:11px 15px;border-radius:999px;color:var(--muted);font-weight:800}.nav-links a.active,.nav-links a:hover{background:#fff;border:1px solid var(--line);box-shadow:0 5px 0 rgba(0,0,0,.05);color:var(--text)}
.hero,.page-hero,.auth-hero{padding:52px 0 28px}.hero-grid,.lesson-hero-grid,.auth-shell{display:grid;grid-template-columns:1.12fr .88fr;gap:24px;align-items:start}
.hero-panel,.panel,.lesson-card,.glass-card,.learn-card,.side-panel,.auth-card,.feature-card,.pdf-viewer,.locked-card,.progress-card,.mascot-card,.pdf-card{background:var(--card);border:1px solid rgba(185,216,137,.8);box-shadow:var(--shadow);border-radius:var(--radius)}
.hero-panel,.panel,.lesson-card,.glass-card,.learn-card,.side-panel,.auth-card,.feature-card,.pdf-viewer,.locked-card,.progress-card,.mascot-card{padding:24px}.pdf-card{padding:18px}
.hero-panel-duo{position:relative;overflow:hidden}.hero-panel-duo:after{content:'';position:absolute;right:-30px;top:-40px;width:180px;height:180px;border-radius:50%;background:radial-gradient(circle,#fff7be 0%,rgba(255,247,190,0) 70%)}
.kicker,.section-tag,.eyebrow,.meta-pill{display:inline-flex;align-items:center;padding:8px 12px;border-radius:999px;font-weight:900;font-size:.82rem;background:var(--accent-soft);color:var(--accent-dark);border:1px solid #d5efb6}
.hero h1,.page-hero h1,.auth-card h1{margin:14px 0 10px;line-height:1.03;font-size:clamp(2.2rem,5vw,4rem)}
.hero p,.hero-summary,.section-head p,.goal,.info-card p,.mini-note p,.vocab-item div,.dialogue-en,.learn-card p,.glass-card span,.callout p,.footer,.breadcrumbs,.tiny-text,.auth-note,.provider-sub,.pdf-copy span,.mascot-card p,.path-step small{color:var(--muted)}
.hero-actions,.lesson-links,.badge-row,.lesson-meta,.page-actions,.pagination,.auth-top-actions,.user-actions,.hero-auth-row,.footer-links{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 18px;border-radius:18px;font-weight:900;border:1px solid var(--line);transition:.18s transform ease,.18s box-shadow ease}.btn:hover{transform:translateY(-2px)}.btn-primary{background:var(--accent);color:#fff;border:none;box-shadow:0 5px 0 var(--accent-dark)}.btn-secondary{background:#fff}.btn-secondary:hover{box-shadow:0 5px 0 rgba(0,0,0,.06)}.btn-secondary-disabled:hover{transform:translateY(0px);box-shadow:none}.btn-yellow{background:var(--yellow);border:none;color:#5a4700;box-shadow:0 5px 0 var(--yellow-dark)}.btn-ghost{background:#fff;border:1px solid var(--line)}
.stat-grid,.home-feature-grid,.grid-2,.lesson-grid,.pdf-grid{display:grid;gap:18px}.stat-grid{grid-template-columns:repeat(2,1fr)}.home-feature-grid{grid-template-columns:repeat(3,1fr);margin-top:22px}.lesson-grid{grid-template-columns:repeat(2,1fr)}.grid-2{grid-template-columns:repeat(2,1fr)}.pdf-grid{grid-template-columns:repeat(2,1fr)}
.section{padding:8px 0 28px}.section-head{display:flex;justify-content:space-between;align-items:end;gap:18px;margin-bottom:20px}.section-head h2{margin:12px 0 0;font-size:2rem}.callout{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center}
.learn-card,.lesson-card,.pdf-card,.auth-card,.feature-card,.progress-card,.mascot-card{position:relative;overflow:hidden}.learn-card:before,.lesson-card:before,.pdf-card:before,.auth-card:before,.feature-card:before{content:'';position:absolute;left:0;right:0;top:0;height:8px;background:linear-gradient(90deg,var(--accent),var(--yellow),var(--blue))}
.duo-side-stack{display:grid;gap:18px}.progress-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px}.path-list{display:grid;gap:12px}.path-step{display:grid;grid-template-columns:52px 1fr;gap:12px;align-items:center;padding:12px;border:1px solid var(--line);border-radius:20px;background:#fcfff8}.path-step span{width:52px;height:52px;border-radius:18px;display:grid;place-items:center;font-weight:900;background:#eef8e0;color:var(--accent-dark)}.path-step.done span{background:var(--accent);color:#fff}.path-step.current{background:#fff8cf;border-color:#f1df7b}.path-step.current span{background:var(--yellow);color:#5a4700}.mascot-card{display:grid;grid-template-columns:78px 1fr;gap:16px;align-items:center;background:linear-gradient(180deg,#ffffff,#f7fff0)}.mascot-badge{width:78px;height:78px;border-radius:24px;display:grid;place-items:center;font-weight:900;font-size:1.4rem;color:#fff;background:linear-gradient(135deg,var(--blue),#2f88ff)}
.content-layout{display:grid;grid-template-columns:280px 1fr;gap:24px;padding-bottom:36px}.side-panel{position:sticky;top:96px}.side-nav{display:grid;gap:10px;margin-top:14px}.side-nav a{padding:12px 14px;border:1px solid var(--line);border-radius:14px;background:#fff;color:var(--muted);font-weight:800}.side-nav a.active,.side-nav a:hover{color:var(--text);box-shadow:0 4px 0 rgba(0,0,0,.05)}
.dialogue-table,.vocab-list,.steps-list,.practice-list,.recap-list,.mini-list{display:grid;gap:12px;margin:0;padding:0;list-style:none}.dialogue-row,.vocab-item,.step-item,.practice-item,.recap-item,.info-card,.mini-note{border:1px solid var(--line);border-radius:18px;background:#fff;padding:16px}.dialogue-row{display:grid;grid-template-columns:120px 1fr;gap:14px}.dialogue-speaker{font-weight:900;color:var(--accent-dark)}.dialogue-hu{font-weight:800;margin-bottom:6px}
.lesson-card .goal{padding:14px 16px;border:1px solid var(--line);border-radius:18px;background:#fbfff6}.glass-card strong{display:block;font-size:1.8rem}.eyebrow{margin-bottom:8px}.pdf-card{display:grid;grid-template-columns:64px 1fr auto;gap:14px;align-items:center;background:linear-gradient(180deg,#fff,#fbfff7)}.pdf-icon{width:64px;height:64px;border-radius:20px;display:grid;place-items:center;font-weight:900;color:#fff;background:linear-gradient(135deg,#ff6b6b,#ff3d54)}.pdf-icon.alt{background:linear-gradient(135deg,var(--blue),#3f8cff)}.pdf-copy strong{display:block;margin-bottom:4px;font-size:1rem}
.form-grid{display:grid;gap:14px;margin-top:18px}.form-grid label{display:grid;gap:8px;font-weight:800}.form-grid input{width:100%;padding:14px 16px;border-radius:16px;border:1px solid var(--line);background:#fff;font:inherit}.form-grid input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 4px rgba(88,204,2,.12)}
.auth-divider{display:flex;align-items:center;gap:12px;color:var(--muted);font-weight:800;margin:10px 0}.auth-divider:before,.auth-divider:after{content:'';height:1px;background:var(--line);flex:1}.muted-link{color:var(--accent-dark);font-weight:800}.notice{padding:14px 16px;border-radius:16px;background:#fff7e8;border:1px solid #f3d6a0;color:#7a5717}.success{padding:14px 16px;border-radius:16px;background:#edf9f1;border:1px solid #b9e2c5;color:#1e6a35}.error{padding:14px 16px;border-radius:16px;background:#fff0f0;border:1px solid #f0bcbc;color:#942828}.user-chip{display:inline-flex;align-items:center;gap:10px;padding:10px 14px;background:#fff;border:1px solid var(--line);border-radius:999px;font-weight:800}.hidden{display:none !important}
.pdf-frame{width:100%;height:min(78vh,980px);border:none;border-radius:20px;background:#f3f6fb}.locked-card{text-align:center;padding:48px 24px}.locked-card h2{margin-top:12px}.locked-icon{width:72px;height:72px;border-radius:24px;display:grid;place-items:center;margin:0 auto;background:linear-gradient(135deg,var(--accent),#83df37);color:#fff;font-size:2rem;font-weight:900}
.provider-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:18px 0 8px}.provider-btn{display:flex;align-items:center;justify-content:center;gap:10px;padding:14px 12px;border:1px solid var(--line);border-radius:18px;background:#fff;font-weight:900;color:var(--text);transition:.18s}.provider-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.provider-icon{width:34px;height:34px;border-radius:12px;display:grid;place-items:center;font-size:1rem;font-weight:900;background:var(--accent-soft);color:var(--accent-dark)}.auth-note{margin-top:16px;padding:14px 16px;border-radius:16px;background:#f8fff0;border:1px solid var(--line)}.form-actions{display:grid;gap:12px}
.footer{padding:24px 0 40px}.footer-inner{display:flex;justify-content:space-between;gap:16px;align-items:center}.breadcrumbs{display:flex;gap:10px;margin-bottom:18px}
@media (max-width:1000px){.hero-grid,.lesson-hero-grid,.content-layout,.grid-2,.home-feature-grid,.lesson-grid,.callout,.auth-shell,.pdf-grid{grid-template-columns:1fr}.side-panel{position:static}.section-head,.footer-inner{display:grid}.dialogue-row{grid-template-columns:1fr}.pdf-card{grid-template-columns:56px 1fr}.pdf-card .btn{grid-column:1/-1}}
@media (max-width:720px){.nav{display:grid;align-items:start;padding:14px 0;min-height:unset}.stat-grid,.provider-grid{grid-template-columns:1fr}.hero h1,.page-hero h1,.auth-card h1{font-size:2.3rem}.mascot-card{grid-template-columns:1fr;text-align:center}.mascot-badge{margin:0 auto}}
@media (max-width:520px){.badge-row,.lesson-links,.hero-auth-row,.auth-top-actions,.hero-actions{display:grid}.btn{width:100%}}


/* Audio enhancements */
.lesson-card .audio-mini,
.audio-gate,
.audio-card,
.audio-hero-card{
  margin-top:16px;
}
.audio-shell{
  display:grid;
  gap:10px;
  padding:16px;
  border-radius:20px;
  border:1px solid var(--line);
  background:linear-gradient(180deg,#ffffff,#f6ffe9);
}
.audio-shell.locked{
  background:linear-gradient(180deg,#fffef8,#fff6d9);
}
.audio-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  flex-wrap:wrap;
}
.audio-title{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:900;
}
.audio-badge{
  width:42px;
  height:42px;
  border-radius:14px;
  display:grid;
  place-items:center;
  font-weight:900;
  color:#fff;
  background:linear-gradient(135deg,var(--blue),#5dd2ff);
  box-shadow:0 6px 0 rgba(28,176,246,.18);
}
.audio-title small{
  display:block;
  color:var(--muted);
  font-weight:700;
}
.audio-player-wrap{
  padding:10px;
  border-radius:18px;
  background:#fff;
  border:1px solid var(--line);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.7);
}
.audio-player{
  width:100%;
  height:54px;
  filter:saturate(1.1);
}
.audio-note{
  color:var(--muted);
  font-size:.95rem;
  margin:0;
}
.audio-gate .btn,
.audio-mini .btn{
  width:auto;
}
.login-prompt{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  flex-wrap:wrap;
}
.login-prompt p{
  margin:0;
  color:var(--muted);
}
.pdf-grid{
  margin-top:8px;
}
.home-files-intro{
  margin-bottom:8px;
}
@media (max-width:520px){
  .audio-head,.login-prompt{display:grid}
}


/* Auth provider cards */
.auth-card-large{padding-bottom:28px}
.provider-panel{margin-top:18px;padding:18px;border:1px solid var(--line);border-radius:22px;background:linear-gradient(180deg,#fbfff5 0%,#f3ffe4 100%)}
.provider-head h2{margin:0 0 6px;font-size:1.2rem}
.provider-head p{margin:0 0 14px;color:var(--muted)}
.provider-grid-login{display:grid;grid-template-columns:1fr;gap:12px}
.provider-card{display:flex;align-items:center;gap:14px;padding:14px 16px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 6px 0 rgba(0,0,0,.04);transition:.18s transform ease,.18s box-shadow ease}
.provider-card:hover{transform:translateY(-2px);box-shadow:0 10px 0 rgba(0,0,0,.05)}
.provider-card strong{display:block;font-size:1rem}
.provider-card span{display:block;color:var(--muted);font-size:.92rem;margin-top:2px}
.provider-logo{width:42px;height:42px;flex:0 0 42px}
.auth-divider{display:flex;align-items:center;justify-content:center;margin:18px 0;color:var(--muted);font-weight:800}
.auth-divider span{padding:0 12px;position:relative;background:var(--card)}
.auth-divider:before,.auth-divider:after{content:'';height:1px;background:var(--line);flex:1}
.auth-stack-split{justify-content:space-between}
.feature-card-auth{align-self:stretch}

@media (max-width: 900px){
  .auth-stack-split{flex-direction:column}
}


.auth-card-large{padding-bottom:28px}
.provider-panel{margin-top:18px;padding:18px;border:1px solid var(--line);border-radius:22px;background:linear-gradient(180deg,#fbfff5 0%,#f3ffe4 100%)}
.provider-head h2{margin:0 0 6px}
.provider-head p{margin:0;color:var(--muted)}
.provider-card{display:flex;align-items:center;gap:14px;padding:14px 16px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 6px 0 rgba(0,0,0,.04);transition:.18s transform ease,.18s box-shadow ease}
.provider-card:hover{transform:translateY(-2px);box-shadow:0 10px 0 rgba(0,0,0,.05)}
.provider-card strong{display:block;font-size:1rem}
.provider-card span{display:block;color:var(--muted);font-size:.92rem;margin-top:2px}
.provider-logo{width:42px;height:42px;flex:0 0 42px}
.feature-card-auth{align-self:stretch}
.premium-modal{position:fixed;inset:0;z-index:120;display:grid;place-items:center;padding:20px}
.premium-modal.hidden{display:none !important}
.premium-modal-backdrop{position:absolute;inset:0;background:rgba(27,35,14,.58);backdrop-filter:blur(3px)}
.premium-modal-card{position:relative;z-index:1;width:min(760px,100%);background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:30px;padding:28px}
.premium-close{position:absolute;top:14px;right:14px;width:44px;height:44px;border:none;border-radius:16px;background:#f5f8ef;font-size:1.5rem;cursor:pointer}
.premium-steps{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:18px}
.premium-step-card{border:1px solid var(--line);border-radius:22px;padding:18px;background:linear-gradient(180deg,#ffffff,#fbfff6)}
.premium-step-card strong{display:block;margin-bottom:8px;font-size:1.05rem}
.premium-step-card p{margin:0 0 14px;color:var(--muted)}
.premium-code-box{display:grid;gap:10px}
.premium-code-box label{font-weight:800}
.premium-code-box input{width:100%;padding:14px 16px;border-radius:16px;border:1px solid var(--line);font:inherit}
.premium-success,.premium-error,.premium-note{margin-top:12px;padding:14px 16px;border-radius:16px}
.premium-success{background:#edf9f1;border:1px solid #b9e2c5;color:#1e6a35}
.premium-error{background:#fff0f0;border:1px solid #f0bcbc;color:#942828}
.premium-note{background:#f8fff0;border:1px solid var(--line);color:var(--muted)}
.level-card.unlocked{border-color:#b6ea86;background:linear-gradient(180deg,#ffffff,#f2ffe0)}
.level-card.unlocked .level-badge{background:#e8ffd1;color:var(--accent-dark)}
@media (max-width:1000px){.premium-steps{grid-template-columns:1fr}}


/* Premium levels cards */
.level-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;margin-top:12px}
.level-card{display:grid;gap:16px;padding:24px;border:1px solid var(--line);border-radius:28px;background:linear-gradient(180deg,#ffffff,#f7ffeb);box-shadow:var(--shadow)}
.level-card.premium{position:relative;overflow:hidden}
.level-card.premium:before{content:'';position:absolute;right:-30px;top:-30px;width:120px;height:120px;border-radius:50%;background:radial-gradient(circle,rgba(255,210,80,.35),rgba(255,210,80,0));pointer-events:none}
.level-top{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.level-badge{display:inline-flex;align-items:center;justify-content:center;padding:8px 12px;border-radius:999px;background:#fff0b8;color:#7a5717;font-weight:900;border:1px solid #f2db89}
.level-stage{display:inline-flex;align-items:center;justify-content:center;padding:8px 12px;border-radius:999px;background:#eef8df;color:var(--accent-dark);font-weight:900;border:1px solid #cfe7a7}
.level-card h3{margin:0;font-size:1.45rem}
.level-card p{margin:0;color:var(--muted)}
.level-card .mini-list{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.level-card .mini-list li{list-style:none;padding:12px 14px;border-radius:16px;background:#fff;border:1px solid var(--line);font-weight:800;color:var(--text);text-align:center}
.premium-advanced{background:linear-gradient(180deg,#ffffff,#eef6ff)}
.premium-advanced .level-stage{background:#eaf3ff;border-color:#cfe2ff;color:#2f6fd8}
.premium-advanced .level-badge{background:#fff1bf}
@media (max-width:1000px){.level-grid{grid-template-columns:1fr}.level-card .mini-list{grid-template-columns:1fr}}