/* Teaching stays inside the journey; the dialog has its own reading space. */
html{scrollbar-gutter:stable}.lesson-actions{display:flex;align-items:center;gap:22px;flex-wrap:wrap}.lesson-actions .primary{font-size:12px;padding:11px 20px;min-height:44px}.lesson-actions .lesson-action{font-size:11px}.lesson-status{font-size:11px}.lesson-steps{height:100px}.lesson-steps p{max-width:430px}.lesson-hint{margin-top:13px}.tutorial-dialog{width:min(1100px,94vw);max-width:none;height:min(780px,90dvh);max-height:90dvh;margin:auto;padding:0;overflow:hidden;border-radius:18px;border-color:#61728b50;background:#101318;color:#edf0f5;box-shadow:0 30px 130px #000b}.tutorial-top{height:104px;padding:20px 30px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #35405260;gap:16px}.tutorial-identity{display:flex;align-items:center;gap:17px}.tutorial-identity img{opacity:.87;flex:none}.tutorial-kicker{font-size:10px;color:#9aaabe;margin:0 0 5px}.tutorial-top h2{font-size:20px;letter-spacing:-.5px;line-height:1.6;margin:0}.tutorial-close{border:1px solid #c6d5ec40;border-radius:50%;width:40px;height:40px;flex:none;font:25px Arial;background:transparent;color:#b5c2d3}.tutorial-close:hover{background:#ffffff0c;color:white}.tutorial-layout{height:calc(100% - 104px);display:grid;grid-template-columns:250px minmax(0,1fr)}.tutorial-map{padding:25px 23px;background:#0d1015;border-left:1px solid #35405260;overflow:auto}.tutorial-status{font-size:10px;color:#aebace;line-height:1.9;margin-bottom:19px}.tutorial-meter{height:2px;background:#68798e38;overflow:hidden}.tutorial-meter span{display:block;height:100%;background:#c0d1e7;transition:width .3s}.tutorial-count{font-size:10px;color:#8295af;margin:9px 0 18px}.tutorial-map nav{display:grid;gap:4px}.tutorial-map nav button{text-align:right;display:flex;align-items:baseline;gap:11px;border:0;border-radius:7px;background:transparent;font-size:11px;line-height:1.8;padding:10px 7px;color:#9ba9bc}.tutorial-map nav button>span{font-size:10px;min-width:19px;direction:ltr}.tutorial-map nav button[aria-current]{background:#aecbf20c;color:#eef4ff}.tutorial-map nav button:hover:enabled{color:#fff;background:#ffffff09}.tutorial-map nav button:disabled{opacity:.43}.tutorial-retention{font-size:10px;line-height:1.9;color:#8e9baf;margin:26px 0 0;padding-top:19px;border-top:1px solid #35405260}.tutorial-scroll{padding:27px 38px 32px;overflow:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:#49566a transparent}.practice-label{display:flex;align-items:center;gap:8px;font-size:10px;color:#b3c1d4;margin-bottom:30px}.practice-label>span{width:5px;height:5px;border-radius:50%;background:#bacfe9}.practice-heading .eyebrow{margin-bottom:10px;font-size:10px}.practice-heading h3,.practice-finish h3{font-size:30px;font-weight:400;letter-spacing:-.8px;line-height:1.65;margin:0 0 12px}.practice-heading>p:last-child,.practice-finish>p{font-size:13px;line-height:2.1;color:#b9c4d3;margin:0 0 22px}#practice-heading:focus{outline:none}.practice-prerequisite,.practice-help{font-size:11px;line-height:2;color:#a5b4c9}.practice-prerequisite{margin:0 0 20px}.practice-help{margin-top:28px;border-top:1px solid #3b475a66;padding-top:15px}.practice-prerequisite summary,.practice-help summary{cursor:pointer;color:#bbcbdf;min-height:27px}.practice-prerequisite p{margin:8px 0;padding-inline-start:16px;max-width:560px}.practice-help ul{padding-right:19px;margin:10px 0 0}.practice-help li+li{margin-top:8px}.practice-workspace{padding:23px;background:#191e26;border:1px solid #505d713f;border-radius:12px}.practice-field{margin:0 0 20px;min-width:0;border:0;padding:0}.practice-field:last-child{margin-bottom:0}.practice-field>label,.practice-field>legend{display:block;font-size:12px;line-height:1.8;margin-bottom:9px;color:#d4dfed}.practice-field input[type=text],.practice-field textarea,.practice-field select{font:12px/1.9 Vazirmatn,Arial,sans-serif;color:#f0f4fa;background:#0f141b;border:1px solid #64728a70;border-radius:7px;padding:10px 12px;width:100%;outline-offset:3px;min-height:44px}.practice-field textarea{resize:vertical;min-height:100px;max-height:300px}.practice-field input::placeholder,.practice-field textarea::placeholder{color:#8d9aad}.practice-field input[type=radio],.practice-field input[type=checkbox]{accent-color:#bad0ec;width:17px;height:17px;flex:none;margin:0}.practice-field [aria-invalid=true]{border-color:#f1ba95}.practice-field input:focus-visible,.practice-field select:focus-visible,.practice-field textarea:focus-visible{outline:2px solid #a8c1e0}.practice-choices{display:grid;gap:8px}.practice-choices label,.check-field label{display:flex;gap:11px;align-items:center;font-size:12px;line-height:1.9;cursor:pointer;min-height:46px}.practice-choices label{background:#0f141b;border:1px solid #63748a50;padding:10px 12px;border-radius:7px}.practice-choices label:has(:checked){border-color:#b7cce699;background:#a7c4ef0d}.practice-choices label:hover{border-color:#a5bdd566}.check-field{margin-bottom:10px}.check-field label{margin:0}.field-help,.practice-note{font-size:10px;line-height:1.9;color:#a5b5cb;margin:9px 0 0}.practice-note{padding-top:15px;border-top:1px solid #70839e40;margin-top:18px}.field-error,.practice-validation{font-size:11px;line-height:1.9;color:#f0bf9c;margin:8px 0 0}.practice-observe{font-size:12px;color:#b8c7da;line-height:2;margin:0}.practice-sample{margin-bottom:21px;padding-bottom:19px;border-bottom:1px solid #63748a40}.practice-sample>span{font-size:9px;color:#95a9c3;display:block;margin-bottom:9px}.practice-sample p{white-space:pre-line;font-size:12px;line-height:2.1;margin:0;color:#d0dbe9}.practice-result{margin-top:22px;display:flex;align-items:flex-start;gap:13px;padding:18px 0;border-block:1px solid #8196b440}.result-mark{width:25px;height:25px;display:grid;place-items:center;border-radius:50%;border:1px solid #a6c2e480;color:#d2e2f7;font-size:12px;flex:none}.practice-result strong{font-size:11px;font-weight:500;color:#e1eafa}.practice-result p{font-size:12px;line-height:2.1;color:#b5c5d9;margin:7px 0 0;white-space:pre-line}.practice-actions{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-top:22px}.practice-actions .primary{font-size:12px;line-height:1.8;min-height:44px}.practice-actions>[data-practice-back],.practice-restart,.tutorial-return{font-size:11px;line-height:1.9;padding:11px 3px;border:0;background:transparent;color:#b4c5dc;min-height:44px}.practice-finish{padding:16px 0}.practice-finish .eyebrow{margin-bottom:14px;font-size:11px}.practice-finish ul{padding:0;list-style:none;margin:25px 0}.practice-finish li{font-size:13px;line-height:2;padding:12px 0;border-bottom:1px solid #53617950;display:flex;gap:14px}.practice-finish li:before{content:'✓';color:#adc7eb}.practice-final-actions{display:flex;gap:17px;align-items:center;flex-wrap:wrap}.practice-final-actions .primary{font-size:12px}.practice-restart{color:#8e9fb5}#index-links button img{width:26px;height:26px;opacity:.7;flex:none}#index-links button{min-height:55px}
@media(max-width:767px){.lesson-actions{gap:15px;flex-wrap:nowrap}.lesson-actions .primary{font-size:10px;min-height:42px;padding:10px 14px;gap:15px}.lesson-actions .lesson-action{font-size:9px;min-height:42px;gap:8px}.lesson-status{font-size:9px}.lesson-steps{height:76px;margin-bottom:9px}.tutorial-dialog{width:calc(100vw - 18px);height:94dvh;max-height:94dvh;border-radius:14px}.tutorial-top{height:90px;padding:15px 17px;gap:12px}.tutorial-identity{gap:11px}.tutorial-identity img{width:32px;height:32px}.tutorial-kicker{font-size:8px;margin-bottom:4px}.tutorial-top h2{font-size:15px;line-height:1.8;letter-spacing:-.3px}.tutorial-close{width:36px;height:36px}.tutorial-layout{height:calc(100% - 90px);display:flex;flex-direction:column}.tutorial-map{flex:none;border-left:0;border-bottom:1px solid #35405260;padding:11px 19px 10px;display:flex;align-items:center;gap:14px;overflow:visible}.tutorial-status{margin:0;font-size:9px;max-width:48%;line-height:1.6}.tutorial-meter{flex:1}.tutorial-count{margin:0;font-size:9px;flex:none}.tutorial-map nav,.tutorial-retention{display:none}.tutorial-scroll{padding:20px 19px 25px;min-height:0;flex:1}.practice-label{font-size:9px;margin-bottom:22px}.practice-heading h3,.practice-finish h3{font-size:25px;line-height:1.6;margin-bottom:10px}.practice-heading>p:last-child,.practice-finish>p{font-size:12px;line-height:2;margin-bottom:17px}.practice-workspace{padding:17px 14px}.practice-field>label,.practice-field>legend,.practice-choices label,.check-field label{font-size:11px}.practice-field input[type=text],.practice-field textarea,.practice-field select{font-size:16px;line-height:1.8;padding:10px;min-height:46px}.practice-field textarea{min-height:128px}.practice-choices label{min-height:48px}.practice-prerequisite,.practice-help{font-size:10px}.practice-actions .primary{font-size:11px;padding:11px 15px;max-width:77%}.practice-actions{gap:10px}.practice-result p{font-size:11px}.practice-note{font-size:10px}.practice-final-actions{gap:8px 15px}.practice-final-actions .primary{font-size:11px}.practice-finish li{font-size:12px}}
@media(max-height:700px) and (max-width:767px){.lesson-steps{height:65px}.lesson-actions .primary{min-height:37px;padding:8px 12px;font-size:9px}.lesson-actions .lesson-action{font-size:9px}.tutorial-dialog{height:96dvh;max-height:96dvh}.tutorial-top{height:76px}.tutorial-layout{height:calc(100% - 76px)}.tutorial-scroll{padding-top:17px}.practice-label{margin-bottom:15px}}
@media(max-height:500px) and (min-width:540px){.lesson-actions .primary{font-size:9px;min-height:33px;padding:7px 12px}.lesson-actions .lesson-action{font-size:9px}.lesson-steps{height:49px;margin-bottom:8px}.tutorial-dialog{height:96dvh;max-height:96dvh}.tutorial-top{height:70px}.tutorial-layout{height:calc(100% - 70px)}.tutorial-map{display:none}.tutorial-layout{grid-template-columns:minmax(0,1fr)}.tutorial-scroll{padding:18px 25px}.practice-label{margin-bottom:12px}}

/* Two explicit entrances; complete white wordmark, without a duplicate AI label. */
header .brand img,header .brand:hover img{filter:brightness(0) invert(1)}
.fallback-logo{filter:grayscale(1) brightness(1.15)}
header nav{gap:22px}header .app-entry,header .mobile-entry{display:inline-flex;align-items:center;justify-content:center;gap:15px;font-size:12px;line-height:1.8;min-height:44px;padding:9px 17px;border:1px solid #ffffff30;border-radius:30px;white-space:nowrap}
header .mobile-entry{color:#b9c5d5;background:#ffffff04}header .mobile-entry:hover{background:#ffffff10;color:#fff}header .app-entry>span:first-child,header .mobile-entry>span:first-child{font:inherit}header .mobile-entry>span[aria-hidden]{font:18px Arial}
@media(max-width:767px){header{height:112px;display:flex;flex-direction:column;align-items:stretch;padding:10px 20px 9px;gap:9px;background:linear-gradient(#08090bf7,#08090bcc 78%,#08090b00)}header .brand{align-self:flex-start;height:31px}header .brand img{width:48px;height:31px}header nav{gap:8px;width:100%}header .open-index{position:absolute;left:20px;top:9px;width:38px;height:34px;padding:0;justify-content:center}header .app-entry,header .mobile-entry{font-size:10px;min-height:40px;padding:8px 9px;gap:7px;flex:1.4;line-height:1.6}header .mobile-entry{flex:1}header .app-entry>span[aria-hidden],header .mobile-entry>span[aria-hidden]{font:13px Arial}.fallback-planet{top:28.5%} }
@media(max-height:700px) and (max-width:767px){.fallback-planet{top:28.5%;width:34vw}}
@media(max-height:500px) and (min-width:540px){header{height:57px;display:flex;flex-direction:row;align-items:center;padding:8px 24px;gap:18px}header nav{width:auto;gap:10px}header .open-index{position:static;width:25px;height:30px}header .brand{height:28px;align-self:auto}header .brand img{width:43px;height:28px}header .app-entry,header .mobile-entry{font-size:9px;min-height:33px;padding:7px 10px;flex:none}.fallback-planet{top:50%;width:32vw}}