/* ==========================================================================
   BOSTON STUDY HUB ACADEMY — public front page (app-landing.js) + login dialog
   Light, warm, airy; same tokens as shell.css (loaded right after it).
   Mobile-first checks: 360–420 px without horizontal scroll, 44 px targets.
   ========================================================================== */
body.ld-mode{overflow:auto!important;background:#fbf8f4}
body.ld-mode.ld-dialog-open{overflow:hidden!important}
.auth-screen.ld-host{position:static;inset:auto;z-index:auto;display:block;overflow:visible;background:transparent}
.auth-screen.ld-host[hidden]{display:none!important}

.ld{--ld-warm:#fbf8f4;--ld-wa:#0f7a43;color:var(--text);min-height:100vh;overflow-x:clip;background:var(--ld-warm)}
.ld-wrap{max-width:1180px;margin:0 auto;padding:0 24px}
.ld h1,.ld h2,.ld h3{font-family:var(--display);color:var(--text);margin:0}
.ld p{margin:0}
.ld .btn{white-space:nowrap}
.ld .btn .ic{margin:0}
#ldMain{outline:none}

/* ---------------- top bar ---------------- */
.ld-top{position:sticky;top:0;z-index:30;background:rgba(251,248,244,.9);backdrop-filter:saturate(1.4) blur(12px);
  border-bottom:1px solid rgba(15,23,42,.05)}
.ld-top-in{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:72px}
.ld-logo{display:flex;align-items:center;min-height:44px;flex:0 0 auto;border-radius:10px}
.ld-logo img{display:block;height:54px;width:auto}
.ld-top-nav{display:flex;align-items:center;gap:10px;min-width:0}
.ld-lang{display:inline-flex;gap:2px;padding:0;border-radius:12px;background:#f0ece6}
.ld-lang-b{min-width:46px;min-height:44px;padding:0 8px;border:1px solid transparent;border-radius:12px;background:transparent;
  font:inherit;font-size:13px;font-weight:700;letter-spacing:.04em;color:var(--dim);cursor:pointer;transition:background-color .15s,color .15s}
.ld-lang-b:hover{color:var(--text)}
.ld-lang-b[aria-pressed="true"]{background:#fff;color:var(--red-ink);border-color:rgba(15,23,42,.06);box-shadow:0 1px 2px rgba(15,23,42,.08),0 1px 6px rgba(15,23,42,.05)}
.ld-site{display:inline-flex;align-items:center;gap:7px;min-height:44px;padding:0 12px;border-radius:12px;color:var(--dim);font-size:14.5px;font-weight:600;text-decoration:none}
.ld-site:hover{background:rgba(15,23,42,.04);color:var(--text)}
.ld-login-b{min-height:44px}

/* ---------------- hero ---------------- */
.ld-hero{padding:56px 0 80px;
  background:
    radial-gradient(720px 440px at 88% 8%, rgba(229,46,46,.08), transparent 65%),
    radial-gradient(640px 420px at 0% 100%, rgba(212,168,58,.13), transparent 65%),
    linear-gradient(180deg,var(--ld-warm) 0%,#fff 100%)}
.ld-hero-in{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:56px;align-items:center}
.ld-eyebrow{display:inline-flex;align-items:center;gap:7px;padding:6px 14px 6px 11px;border-radius:999px;background:#fff;
  box-shadow:var(--shadow-sm);color:var(--red-ink);font-size:13.5px;font-weight:600}
.ld-hero h1{margin:20px 0 18px;line-height:1.06;letter-spacing:-.025em}
.ld-h1-brand{display:block;font-size:clamp(17px,1.6vw,20px);font-weight:700;letter-spacing:-.005em;color:var(--dim);margin-bottom:10px}
.ld-h1-main{display:block;font-size:clamp(34px,4.6vw,58px);font-weight:750}
.ld-h1-main em{font-style:normal;color:var(--red)}
.ld-lead{font-size:18px;line-height:1.6;color:var(--dim);max-width:52ch}
.ld-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.ld-cta .btn{min-height:52px;padding:12px 24px;font-size:16px}
.ld-cta .btn-wa small{display:none}
.btn-wa .ic{color:var(--ld-wa)}
.ld-already{margin-top:16px;font-size:15px;color:var(--dim);display:flex;flex-wrap:wrap;align-items:center;gap:0 4px}
.ld-linkbtn{min-height:44px;min-width:44px;padding:0 6px;border:0;background:transparent;font:inherit;font-weight:650;color:var(--red-ink);
  text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;cursor:pointer;border-radius:8px}
.ld-linkbtn:hover{color:var(--red-deep)}

.ld-hero-fig{position:relative;margin:0}
.ld-hero-fig::before{content:'';position:absolute;inset:8% -4% -6% 10%;border-radius:36px;background:linear-gradient(135deg,#fdf5e1,#fdeeee);transform:rotate(3deg);z-index:0}
.ld-photo{position:relative;z-index:1;border-radius:28px;overflow:hidden;aspect-ratio:5/4;background:#f1ece4;
  box-shadow:0 2px 4px rgba(15,23,42,.05),0 18px 44px rgba(15,23,42,.14)}
.ld-photo img{display:block;width:100%;height:100%;object-fit:cover;object-position:center 35%}
.ld-chip{position:absolute;z-index:2;display:flex;align-items:center;gap:10px;padding:10px 16px 10px 10px;border-radius:16px;background:#fff;
  box-shadow:0 2px 4px rgba(15,23,42,.05),0 12px 28px rgba(15,23,42,.12);font-size:14px;line-height:1.25}
.ld-chip b{display:block;font-weight:650;color:var(--text)}
.ld-chip small{display:block;font-size:13px;color:var(--dim);margin-top:1px}
.ld-chip-ico{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;background:var(--brand-soft);color:var(--red-ink);flex:0 0 auto}
.ld-chip-ico.ok{background:#e6f6ef;color:#0b7a57}
.ld-chip-a{left:-22px;bottom:-20px}
.ld-chip-b{right:-14px;top:24px}

/* ---------------- sections ---------------- */
.ld-sec{padding:84px 0}
.ld-sec-head{max-width:700px;margin-bottom:36px}
.ld-sec-head h2{font-size:clamp(27px,3vw,38px);font-weight:700;letter-spacing:-.022em;line-height:1.15}
.ld-sec-head p{margin-top:12px;font-size:17px;line-height:1.6;color:var(--dim)}

/* ---------------- course catalogue ---------------- */
#ldCourses{background:#fff}
.ld-courses{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.ld-course{display:flex;flex-direction:column;gap:12px;padding:24px;border-radius:22px;background:#fff;border:1px solid rgba(15,23,42,.06);
  box-shadow:var(--shadow);min-width:0;transition:transform .15s var(--ease),box-shadow .15s var(--ease)}
.ld-course:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.ld-course h3{font-size:19px;font-weight:700;letter-spacing:-.012em;line-height:1.25}
.ld-course>p{font-size:15.5px;line-height:1.6;color:var(--dim)}
.ld-course-top{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-bottom:4px}
.ld-cico{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;flex:0 0 auto}
.tone-red{background:var(--brand-soft);color:var(--red-ink)}
.tone-blue{background:#eaf2fd;color:#1f57a6}
.tone-violet{background:#f2eefb;color:#5b3fa0}
.tone-gold{background:var(--gold-soft);color:var(--gold-ink)}
.tone-teal{background:#e6f5f1;color:#0b6e5c}
.tone-rose{background:#fdeef3;color:#a3264f}
.ld-badge{display:inline-flex;align-items:center;gap:7px;padding:5px 12px;border-radius:999px;font-size:12.5px;font-weight:650;line-height:1.3}
.ld-badge.live{background:#e6f6ef;color:#0b7a57}
.ld-badge.live i{width:8px;height:8px;border-radius:50%;background:#12a26f;box-shadow:0 0 0 3px rgba(18,162,111,.18)}
.ld-badge.centre{background:#fdf3dc;color:#8a5705}
.ld-soon{display:flex;align-items:center;gap:6px;font-size:13.5px;color:var(--dim-2);font-weight:500}
.ld-course-act{display:flex;flex-wrap:wrap;gap:10px;margin-top:auto;padding-top:8px}
.ld-course-act .btn{flex:1 1 auto;min-height:44px}

.ld-course-live{grid-column:span 2;padding:30px;border-color:#f3d6d6;
  background:radial-gradient(420px 240px at 100% 0%,rgba(229,46,46,.08),transparent 70%),#fff}
.ld-course-live h3{font-size:clamp(22px,2.2vw,27px)}
.ld-course-live>p{font-size:16.5px;max-width:60ch}
.ld-course-live .ld-course-act{margin-top:6px}
.ld-course-live .ld-course-act .btn{flex:0 1 auto;min-height:48px;padding:11px 22px}
.ld-ielts-pts{list-style:none;margin:2px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.ld-ielts-pts li{display:inline-flex;align-items:center;gap:7px;padding:7px 13px;border-radius:999px;background:var(--panel-2);font-size:14px;font-weight:600;color:var(--text)}
.ld-ielts-pts .ic{color:var(--red-ink)}
.ld-code-note{display:flex;align-items:flex-start;gap:8px;padding:10px 14px;border-radius:12px;background:var(--gold-soft);font-size:14px;line-height:1.45;color:#5c3d06;max-width:60ch}
.ld-code-note .ic{color:var(--gold-ink);margin-top:2px}
.ld-course-extra{grid-column:span 2;justify-content:center;align-items:flex-start;background:var(--ld-warm);border:1px dashed var(--line-2);box-shadow:none}
.ld-course-extra:hover{transform:none;box-shadow:none}
.ld-course-extra p{font-size:15.5px;line-height:1.55;color:var(--text);font-weight:500}
.ld-textlink{display:inline-flex;align-items:center;gap:6px;min-height:44px;color:var(--red-ink);font-weight:650;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}

/* ---------------- how it works ---------------- */
.ld-how-in{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,.7fr);gap:56px;align-items:center}
.ld-steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.ld-step{position:relative;display:grid;grid-template-columns:52px minmax(0,1fr);gap:16px;align-items:start;padding:20px;border-radius:20px;background:#fff;box-shadow:var(--shadow-sm);border:1px solid rgba(15,23,42,.05)}
.ld-step-ico{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;background:var(--brand-soft);color:var(--red-ink)}
.ld-step-n{position:absolute;left:12px;top:12px;width:22px;height:22px;border-radius:50%;display:grid;place-items:center;background:var(--red-ink);color:#fff;font-size:12px;font-weight:700;box-shadow:0 0 0 2px #fff;z-index:1}
.ld-step h3{font-size:17px;font-weight:650;line-height:1.3;margin-bottom:4px}
.ld-step p{font-size:15px;line-height:1.55;color:var(--dim)}
.ld-how-note{display:flex;align-items:center;gap:8px;margin-top:18px;font-size:14.5px;color:var(--dim)}
.ld-how-note .ic{color:var(--gold-ink)}
.ld-how-cta{margin-top:24px}
.ld-how-fig{margin:0;position:relative}
.ld-how-fig img{display:block;width:100%;height:auto;aspect-ratio:4/5;object-fit:cover;object-position:center 30%;border-radius:28px;background:#f1ece4;
  box-shadow:0 2px 4px rgba(15,23,42,.05),0 18px 44px rgba(15,23,42,.12)}

/* ---------------- contacts ---------------- */
.ld-contacts{background:#fff}
.ld-ct-grid{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:14px}
.ld-ct{display:flex;align-items:center;gap:14px;min-height:76px;padding:14px 18px;border-radius:18px;background:var(--ld-warm);color:var(--text);
  text-decoration:none;border:1px solid rgba(15,23,42,.05);transition:transform .15s var(--ease),box-shadow .15s var(--ease),background-color .15s}
.ld-ct:hover{background:#fff;box-shadow:var(--shadow);transform:translateY(-1px)}
.ld-ct-ico{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:var(--brand-soft);color:var(--red-ink);flex:0 0 auto}
.ld-ct[href^="https://wa.me"] .ld-ct-ico{background:#e7f6ee;color:var(--ld-wa)}
.ld-ct[href*="instagram"] .ld-ct-ico{background:#fdeef3;color:#a3264f}
.ld-ct[href*="2gis"] .ld-ct-ico{background:#e6f5f1;color:#0b6e5c}
.ld-ct[href^="mailto"] .ld-ct-ico{background:#eaf2fd;color:#1f57a6}
.ld-ct[href="https://bostonstudyhub.com"] .ld-ct-ico{background:var(--gold-soft);color:var(--gold-ink)}
.ld-ct-txt{display:flex;flex-direction:column;min-width:0}
.ld-ct-k{font-size:12px;letter-spacing:.06em;text-transform:uppercase;font-weight:600;color:var(--dim-2)}
.ld-ct-txt b{font-size:15.5px;font-weight:650;overflow-wrap:anywhere}

/* ---------------- footer ---------------- */
.ld-foot{background:var(--ld-warm);border-top:1px solid var(--line);padding:36px 0 calc(40px + env(safe-area-inset-bottom,0px))}
.ld-foot-in{display:flex;flex-direction:column;align-items:center;gap:8px;text-align:center}
.ld-foot-logo{width:40px;height:40px;border-radius:50%}
.ld-foot-tag{font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;font-weight:650;color:var(--dim-2)}
.ld-foot-copy{font-size:13.5px;color:var(--dim-2)}

/* ---------------- login dialog ---------------- */
.ld-dialog{padding:0;border:0;background:transparent;color:var(--text);width:calc(100% - 24px);max-width:460px;
  max-height:calc(100vh - 24px);max-height:calc(100dvh - 24px);overflow:auto;margin:auto;overscroll-behavior:contain;border-radius:24px}
.ld-dialog::backdrop{background:rgba(15,23,42,.32);backdrop-filter:blur(4px)}
.ld-dialog .auth-card{position:relative;width:100%;margin:0;padding:30px 30px 22px;box-shadow:0 24px 60px -20px rgba(15,23,42,.35)}
.ld-dialog .auth-wordmark{width:170px;margin:0 auto 6px}
.auth-title{font-size:19px;font-weight:700;text-align:center;letter-spacing:-.012em;margin:0 0 18px}
.ld-x{position:absolute;top:10px;right:10px;width:44px;height:44px;border-radius:12px;display:grid;place-items:center;border:0;background:transparent;color:var(--dim);cursor:pointer;z-index:1}
.ld-x:hover{background:var(--panel-2);color:var(--text)}
.auth-card .field-l{font-size:12px;letter-spacing:.06em;font-weight:600;color:var(--dim-2);text-transform:uppercase}
.auth-card .seg button{min-height:44px}
.pw-wrap{position:relative}
.pw-wrap .input{width:100%;padding-right:86px}
.pw-eye{position:absolute;right:2px;top:0;bottom:0;min-width:44px;padding:0 12px;border:0;border-radius:10px;background:transparent;
  font:inherit;font-size:13px;font-weight:650;color:var(--red-ink);cursor:pointer}
.pw-eye[hidden]{display:none}
.pw-eye:hover{background:var(--panel-2)}
.auth-hint{margin-top:6px}
.auth-code-note{display:flex;align-items:flex-start;gap:6px;margin-top:6px;font-size:13.5px;color:#6f4604}
.auth-code-note .ic{color:var(--gold-ink);margin-top:2px}
.auth-card .input[aria-invalid="true"]{border-color:var(--red-ink)}
.ld-dialog .auth-note{margin:14px 0 4px}
.ld-dialog .auth-offline{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;width:100%;margin-top:8px;padding:8px 10px;min-height:44px;
  border:0;border-top:1px solid var(--line);border-radius:0 0 12px 12px;background:transparent;font-size:13.5px;font-weight:600;color:var(--dim-2);cursor:pointer}
.ld-dialog .auth-offline small{font-size:12px;font-weight:400;color:var(--dim-2)}
.ld-dialog .auth-offline:hover{color:var(--red-ink);background:transparent}
.ld-dialog .auth-offline:hover span{text-decoration:underline;text-underline-offset:3px}
#authUpgrade .auth-up-h{font-size:18px;font-weight:700;margin:0 0 8px}
#authUpgrade .auth-up-p{font-size:15px;line-height:1.55;color:var(--dim);margin:0 0 16px}
#upLater{border-top:0;margin-top:6px}

/* ---------------- motion ---------------- */
@media (prefers-reduced-motion: no-preference){
  .ld-dialog[open]{animation:ld-pop .2s var(--ease)}
  .ld-badge.live i{animation:ld-pulse 2.4s ease-in-out infinite}
  .ld-hero-copy>*{animation:bsh-rise .35s var(--ease) backwards}
  .ld-hero-copy>:nth-child(2){animation-delay:.04s}
  .ld-hero-copy>:nth-child(3){animation-delay:.08s}
  .ld-hero-copy>:nth-child(n+4){animation-delay:.12s}
}
@keyframes ld-pop{from{opacity:0;transform:translateY(10px) scale(.985)}to{opacity:1;transform:none}}
@keyframes ld-pulse{0%,100%{box-shadow:0 0 0 3px rgba(18,162,111,.18)}50%{box-shadow:0 0 0 6px rgba(18,162,111,.06)}}
@media (prefers-reduced-motion: reduce){
  .ld-course:hover,.ld-ct:hover{transform:none}
  .ld *{scroll-behavior:auto!important}
}

/* ---------------- tablet ---------------- */
@media (max-width:1020px){
  .ld-hero-in{grid-template-columns:minmax(0,1fr);gap:44px}
  .ld-hero-fig{max-width:620px}
  .ld-courses{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ld-how-in{grid-template-columns:minmax(0,1fr);gap:36px}
  .ld-how-fig{display:none}
}

/* ---------------- phones ---------------- */
@media (max-width:720px){
  .ld-wrap{padding:0 16px}
  .ld-top-in{min-height:64px;gap:8px}
  .ld-logo img{height:46px}
  .ld-top-nav{gap:6px}
  .ld-site{display:none}
  .ld-hero{padding:28px 0 56px}
  .ld-hero h1{margin:16px 0 14px}
  .ld-h1-brand{font-size:16px;margin-bottom:8px}
  .ld-h1-main{font-size:clamp(31px,8.6vw,38px);line-height:1.1}
  .ld-lead{font-size:16.5px}
  .ld-cta{flex-direction:column;gap:10px;margin-top:24px}
  .ld-cta .btn{width:100%;white-space:normal;text-align:center}
  .ld-already{justify-content:center;text-align:center}
  .ld-hero-fig::before{inset:6% -3% -5% 8%;border-radius:28px}
  .ld-photo{border-radius:22px;aspect-ratio:4/3}
  .ld-chip{padding:8px 12px 8px 8px;font-size:13px;border-radius:14px}
  .ld-chip-ico{width:32px;height:32px}
  .ld-chip-a{left:10px;bottom:-18px}
  .ld-chip-b{right:10px;top:12px}
  .ld-sec{padding:56px 0}
  .ld-sec-head{margin-bottom:24px}
  .ld-sec-head p{font-size:16px}
  .ld-courses{grid-template-columns:minmax(0,1fr);gap:14px}
  .ld-course,.ld-course-live,.ld-course-extra{grid-column:auto;padding:20px}
  .ld-course-live .ld-course-act .btn{flex:1 1 100%}
  .ld-steps{grid-template-columns:minmax(0,1fr);gap:12px}
  .ld-step{padding:16px;gap:14px}
  .ld-dialog{width:calc(100% - 16px);max-height:calc(100dvh - 16px);border-radius:20px}
  .ld-dialog .auth-card{padding:24px 18px 16px;border-radius:20px}
  .ld-dialog .auth-wordmark{width:140px}
}
@media (max-width:400px){
  .ld-login-b .ic{display:none}
  .ld-login-b{padding:8px 14px}
  .ld-lang-b{min-width:44px;padding:0 6px;font-size:12.5px}
  .ld-logo img{height:42px}
}
@media print{
  .ld-top,.ld-dialog,.ld-cta{display:none!important}
  .ld-course,.ld-ct,.ld-step{box-shadow:none!important}
}