:root{--ink:#172223;--muted:#627172;--line:#dfe6e5;--paper:#fbfcfc;--accent:#0f5f60;--accent-soft:#e6f1f0}*{box-sizing:border-box}html,body{height:100%}body{margin:0;min-width:320px;height:100dvh;overflow:hidden;background:var(--paper);color:var(--ink);font-family:Inter,sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}a:focus-visible{outline:2px solid var(--accent);outline-offset:3px}.topbar{height:58px;display:flex;align-items:center;justify-content:space-between;padding:0 26px;border-bottom:1px solid var(--line);background:#fff}.brand{display:inline-flex;align-items:center;gap:8px;color:var(--accent);font-size:15px;font-weight:600;letter-spacing:-.03em}.brand-icon{display:grid;place-items:center;width:27px;height:27px;border-radius:7px;background:var(--accent);color:#fff!important;font-size:17px;font-weight:600;line-height:1}.topbar>span{color:var(--muted);font-size:12px}.app{display:grid;grid-template-columns:178px 198px minmax(0,1fr);height:calc(100dvh - 58px);max-width:1440px;margin:auto;background:#fff}aside{height:calc(100dvh - 58px);padding:24px 17px;border-right:1px solid var(--line)}.sections{background:#fcfdfd}.label{margin:0 0 11px;color:var(--muted);font-size:11px;font-weight:600;letter-spacing:.08em;text-transform:uppercase}.nav-item{display:block;padding:9px 10px;border-radius:5px;color:var(--muted);font-size:13px}.nav-item.current{background:var(--accent-soft);color:var(--accent);font-weight:600}.nav-item.muted{color:#a8b2b2}.lessons h2{margin:0 0 13px;font-size:15px;font-weight:600;letter-spacing:-.03em}.lesson{display:flex;gap:8px;padding:9px 8px;color:var(--muted);font-size:13px}.lesson.current{color:var(--accent);font-weight:600}.number{color:#9aa8a8;font-size:11px}.content{height:calc(100dvh - 58px);overflow-y:auto;padding:clamp(42px,8vh,96px) clamp(28px,7vw,112px)}.content-inner{max-width:660px}.accent{margin:0 0 18px;color:var(--accent);font-size:clamp(52px,8vw,88px);font-weight:600;line-height:.95;letter-spacing:-.08em}h1{margin:0;font-size:clamp(30px,4vw,45px);font-weight:500;line-height:1.08;letter-spacing:-.055em}p{max-width:590px;margin:22px 0 0;color:var(--muted);font-size:16px;line-height:1.75}p+p{margin-top:14px}strong{color:var(--ink);font-weight:600}.examples{margin-top:29px;border-top:1px solid var(--line)}.example{display:grid;grid-template-columns:100px 1fr;gap:12px;padding:14px 0;border-bottom:1px solid var(--line)}.example-script{color:var(--accent);font-size:22px;font-weight:600;text-align:right;direction:rtl}.example-text{color:var(--muted);font-size:14px;line-height:1.55}.example-text strong{display:block;font-size:14px}.next{display:inline-flex;align-items:center;gap:17px;margin-top:31px;padding:11px 14px;border:1px solid var(--accent);border-radius:5px;color:var(--accent);font-size:13px;font-weight:600}.next:hover{background:var(--accent);color:#fff}.next span{font-size:17px;line-height:.7}.not-found{display:grid;place-items:center;height:100dvh;font-size:18px}@media(max-width:760px){.app{grid-template-columns:150px minmax(0,1fr)}.lessons{display:none}}@media(max-width:520px){.topbar{height:54px;padding:0 18px}.topbar>span{display:none}.app{display:block;height:calc(100dvh - 54px)}.sections{height:48px;padding:7px 12px;border-right:0;border-bottom:1px solid var(--line)}.label,.nav-item.muted{display:none}.sections nav{display:flex}.content{height:calc(100dvh - 102px);padding:42px 22px}}
.topbar-links{display:flex;align-items:center;gap:4px}.topbar-links a{padding:6px 9px;border-radius:4px;color:var(--muted);font-size:12px}.topbar-links a[aria-current="page"]{background:var(--accent-soft);color:var(--accent);font-weight:600}.translator-page{height:calc(100dvh - 58px);overflow-y:auto;padding:clamp(42px,8vh,96px) 24px}.translator-shell{width:100%;max-width:620px;margin:0 auto}.translator-form{margin-top:30px}.translator-form label,.result-label{display:block;margin-bottom:8px;color:var(--muted);font-size:12px;font-weight:600}.translator-form textarea{display:block;width:100%;resize:vertical;border:1px solid var(--line);border-radius:5px;padding:13px;color:var(--ink);font:inherit;font-size:16px;line-height:1.6}.translator-form textarea:focus{outline:2px solid var(--accent);outline-offset:2px}.translator-actions{display:flex;gap:8px;margin-top:12px}.translator-actions button{border-radius:5px;padding:10px 14px;font:inherit;font-size:13px;font-weight:600;cursor:pointer}.primary{border:1px solid var(--accent);background:var(--accent);color:#fff}.secondary{border:1px solid var(--line);background:#fff;color:var(--ink)}.secondary:disabled{opacity:.45;cursor:not-allowed}.translation-result{margin-top:28px;padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.translation-result .result-label{margin-top:0}.translation-result #farsi-text{color:var(--accent);font-size:clamp(25px,4vw,34px);font-weight:500;line-height:1.65}.translator-status{min-height:24px;margin-top:13px;color:#a04444;font-size:13px}@media(max-width:520px){.topbar-links a{min-height:36px;display:inline-flex;align-items:center}.translator-page{height:calc(100dvh - 54px);padding:42px 22px}}
.pronoun-list{margin-top:29px;border-top:1px solid var(--line)}.pronoun{display:grid;grid-template-columns:86px 1fr;gap:14px;padding:13px 0;border-bottom:1px solid var(--line);color:var(--muted);font-size:14px;line-height:1.55}.pronoun-fa{color:var(--accent);font-size:22px;font-weight:600;text-align:right;direction:rtl}.next-tbc{border-color:var(--line);color:var(--muted);cursor:default}@media(max-width:520px){.pronoun{grid-template-columns:72px 1fr}}
.practice-content{padding-top:clamp(36px,6vh,72px)}.practice-shell{max-width:620px}.practice-label{margin:0 0 12px;color:var(--accent);font-size:12px;font-weight:600}.practice-instruction{margin-top:14px}.practice-status{display:flex;justify-content:space-between;margin-top:27px;color:var(--muted);font-size:12px}.practice-card{margin-top:10px;padding:28px;border:1px solid var(--line);border-radius:8px}.practice-prompt{margin:0 0 22px;color:var(--ink);font-size:clamp(30px,5vw,44px);font-weight:500;line-height:1.1;letter-spacing:-.05em}.practice-options{display:grid;gap:9px}.practice-option{display:flex;align-items:center;justify-content:space-between;width:100%;padding:13px 15px;border:1px solid var(--line);border-radius:5px;background:#fff;color:var(--ink);cursor:pointer;font:inherit;text-align:left}.practice-option:hover{border-color:var(--accent);background:var(--accent-soft)}.practice-option strong{font-size:15px}.practice-option span{color:var(--accent);font-size:20px;direction:rtl}.practice-option.is-correct{background:#e7f5ec;border-color:#378d58;color:#176837}.practice-option.is-correct span{color:#176837}.practice-option.is-incorrect{background:#fbecec;border-color:#bc4c4c;color:#962d2d}.practice-option.is-incorrect span{color:#962d2d}.practice-history{display:flex;flex-wrap:wrap;gap:6px;min-height:24px;margin-top:18px}.practice-history span{display:grid;place-items:center;width:21px;height:21px;border-radius:50%;font-size:13px;font-weight:600}.practice-history .correct{background:#e7f5ec;color:#176837}.practice-history .incorrect{background:#fbecec;color:#962d2d}.practice-result{margin-top:25px;padding-top:20px;border-top:1px solid var(--line)}.practice-result h2{margin:0;font-size:22px;font-weight:500;letter-spacing:-.04em}.practice-result p{margin-top:8px}.practice-result .secondary{margin-top:18px}.practice-next{display:block;margin-top:26px}.practice-next:disabled{border-color:var(--line);color:#a8b2b2;background:#fff;cursor:not-allowed}@media(max-width:520px){.practice-card{padding:20px}.practice-option{min-height:58px}.practice-status{font-size:11px}}
.practice-prompt.prompt-farsi{display:flex;align-items:baseline;justify-content:space-between;gap:18px}.practice-prompt.prompt-farsi strong{font:inherit}.practice-prompt.prompt-farsi span{color:var(--accent);font-size:1.2em;direction:rtl}
.practice-retry{display:inline-flex;align-items:center;gap:10px;margin-top:18px;padding:10px 13px;border:1px solid var(--accent);border-radius:999px;background:#fff;color:var(--accent);font:inherit;font-size:13px;font-weight:600;cursor:pointer}.practice-retry:hover{background:var(--accent-soft)}.practice-retry span{font-size:17px;line-height:1}
.mobile-lesson-menu{display:none}.lesson-controls{display:flex;justify-content:space-between;gap:10px;margin-top:32px}.lesson-control{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:42px;padding:10px 14px;border:1px solid var(--accent);border-radius:5px;background:#fff;color:var(--accent);font:inherit;font-size:13px;font-weight:600;text-decoration:none;cursor:pointer}.lesson-control:hover{background:var(--accent-soft)}.lesson-control.is-disabled,.lesson-control:disabled{border-color:var(--line);color:#a8b2b2;background:#fff;cursor:not-allowed}.practice-controls{margin-top:26px}.practice-controls #practice-next{margin:0}.practice-next{display:none}@media(max-width:520px){.topbar{position:relative;z-index:5}.desktop-lessons-link{display:none!important}.topbar-links{gap:2px}.mobile-lesson-menu{display:block;position:relative}.mobile-lesson-menu summary{list-style:none;padding:8px 9px;border-radius:4px;color:var(--muted);font-size:12px;cursor:pointer}.mobile-lesson-menu summary::-webkit-details-marker{display:none}.mobile-lesson-menu[open] summary{background:var(--accent-soft);color:var(--accent);font-weight:600}.mobile-lesson-list{position:absolute;top:38px;right:0;width:218px;padding:7px;background:#fff;border:1px solid var(--line);border-radius:6px;box-shadow:0 12px 30px rgba(23,34,35,.12)}.mobile-lesson-list a{display:block;padding:10px;border-radius:4px;color:var(--muted);font-size:13px;white-space:nowrap}.mobile-lesson-list a[aria-current="page"]{background:var(--accent-soft);color:var(--accent);font-weight:600}.app{display:block;height:calc(100dvh - 54px)}.sections,.lessons{display:none}.content{height:calc(100dvh - 54px);padding:42px 22px 110px}.lesson-controls{position:fixed;z-index:4;right:16px;bottom:max(14px,env(safe-area-inset-bottom));left:16px;margin:0;padding:10px 0 0;background:linear-gradient(transparent,#fff 28%)}.lesson-control{flex:1;min-height:48px;background:#fff}.practice-content{padding-bottom:120px}.practice-controls{bottom:max(14px,env(safe-area-inset-bottom))}}
@media(min-width:521px) and (max-width:760px){.topbar{position:relative;z-index:5}.desktop-lessons-link{display:none!important}.mobile-lesson-menu{display:block;position:relative}.mobile-lesson-menu summary{list-style:none;padding:8px 9px;border-radius:4px;color:var(--muted);font-size:12px;cursor:pointer}.mobile-lesson-menu summary::-webkit-details-marker{display:none}.mobile-lesson-list{position:absolute;top:38px;right:0;width:218px;padding:7px;background:#fff;border:1px solid var(--line);border-radius:6px;box-shadow:0 12px 30px rgba(23,34,35,.12)}.mobile-lesson-list a{display:block;padding:10px;border-radius:4px;color:var(--muted);font-size:13px}.mobile-lesson-list a[aria-current="page"]{background:var(--accent-soft);color:var(--accent);font-weight:600}.app{display:block;height:calc(100dvh - 58px)}.sections,.lessons{display:none}.content{height:calc(100dvh - 58px);padding:42px 28px 110px}.lesson-controls{position:fixed;z-index:4;right:20px;bottom:16px;left:20px;margin:0;padding:10px 0 0;background:linear-gradient(transparent,#fff 28%)}.lesson-control{flex:1;min-height:48px;background:#fff}.practice-content{padding-bottom:120px}}
.sentence-parts{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:28px}.sentence-parts div{padding:13px;border-top:2px solid var(--accent-soft);background:#fcfdfd}.sentence-parts span,.sentence-parts small{display:block;color:var(--muted);font-size:11px}.sentence-parts strong{display:block;margin:6px 0;font-size:16px}.lesson-heading{margin:38px 0 0;font-size:23px;font-weight:500;letter-spacing:-.04em}.ending-list{margin-top:24px;border-top:1px solid var(--line)}.ending-list div{display:flex;justify-content:space-between;gap:18px;padding:11px 0;border-bottom:1px solid var(--line);color:var(--muted);font-size:14px}.ending-list strong{font-size:15px}.ending-list b{color:var(--accent)}.ending-option b{color:var(--accent)}@media(max-width:520px){.sentence-parts{grid-template-columns:1fr}.lesson-heading{font-size:21px}}
.vocab-table{width:100%;margin-top:28px;border-collapse:collapse;text-align:left}.vocab-table th,.vocab-table td{padding:11px;border-bottom:1px solid var(--line);font-size:14px}.vocab-table th{color:var(--muted);font-size:11px;text-transform:uppercase}.vocab-table td:last-child{color:var(--accent);font-size:20px;direction:rtl}.builder-columns{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.builder-columns small{display:block;margin:0 0 8px;color:var(--muted);font-size:11px}.builder-columns button{width:100%;margin-bottom:7px;padding:9px;border:1px solid var(--line);background:#fff;border-radius:4px;text-align:left;font:inherit;font-size:13px;cursor:pointer}.builder-columns button.selected{border-color:var(--accent);background:var(--accent-soft);color:var(--accent);font-weight:600}.builder-check{margin-top:16px}.builder-check:disabled{opacity:.45}@media(max-width:520px){.builder-columns{grid-template-columns:1fr}.vocab-table th,.vocab-table td{padding:9px 5px}}
.builder-check{display:none}
.builder-check{display:inline-flex}
/* Sentence builder: the confirmation step is intentionally prominent. */
.builder-check{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:9px;
  min-width:172px;
  min-height:48px;
  margin-top:22px;
  padding:12px 18px;
  border:0;
  border-radius:6px;
  box-shadow:0 7px 16px rgba(15,95,96,.18);
  font:600 14px/1 Inter,sans-serif;
  letter-spacing:-.01em;
  cursor:pointer;
  transition:transform .16s ease,box-shadow .16s ease,background .16s ease;
}
.builder-check::before{content:'✓';font-size:17px;font-weight:500}
.builder-check:hover:not(:disabled){background:#0b5051;box-shadow:0 10px 22px rgba(15,95,96,.25);transform:translateY(-1px)}
.builder-check:active:not(:disabled){box-shadow:none;transform:translateY(1px)}
.builder-check:focus-visible{outline:3px solid #b6d9d7;outline-offset:3px}
.builder-check:disabled{background:#dce6e5;color:#829291;box-shadow:none;cursor:not-allowed;opacity:1}
.builder-check.is-incorrect{background:#a83c3c;box-shadow:0 7px 16px rgba(168,60,60,.18)}
.builder-check.is-incorrect::before{content:'↺'}
@media(max-width:520px){.builder-check{width:100%;min-height:52px;margin-top:20px}}
.practice-mascot{display:none;width:82px;height:auto;margin:0 0 10px;object-fit:contain}.practice-result.is-passed .practice-mascot{display:block;animation:pirooz-arrives .42s cubic-bezier(.2,.9,.3,1.25) both}@keyframes pirooz-arrives{from{opacity:0;transform:translateY(10px) scale(.86)}to{opacity:1;transform:translateY(0) scale(1)}}
/* Mobile navigation sits on an opaque surface so lesson copy never shows through it. */
@media(max-width:760px){
  .lesson-controls{
    background:#fff;
    box-shadow:0 -14px 18px #fff;
  }
}