:root{color-scheme:light;--bg:#f3f7f6;--paper:#fff;--ink:#172d2b;--muted:#687d79;--line:#dce7e3;--accent:#0b766e;--accent-soft:#e2f4ef;--gold:#d69b46;--shadow:0 10px 35px rgba(19,55,49,.06)}
@media(prefers-color-scheme:dark){:root:not([data-theme="light"]){color-scheme:dark;--bg:#101b1a;--paper:#182725;--ink:#edf6f2;--muted:#a3b8b1;--line:#304440;--accent:#45c5b3;--accent-soft:#1b3d37;--shadow:0 10px 35px rgba(0,0,0,.18)}}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.8 "Segoe UI",Tahoma,Arial,sans-serif}.topbar{height:76px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:0 max(24px,calc((100vw - 1280px)/2));background:var(--paper);border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none}.brand-mark{width:43px;height:43px;border-radius:14px;background:var(--accent);color:#fff;display:grid;place-items:center;font-weight:900;letter-spacing:1px}.brand strong,.brand small{display:block}.brand strong{font-size:1.05rem}.brand small{font-size:.78rem;color:var(--muted)}.back-link{color:var(--accent);text-decoration:none;font-weight:700;font-size:.9rem}.layout{max-width:1280px;margin:auto;padding:28px 24px 60px}.hero{display:flex;justify-content:space-between;align-items:center;gap:28px;padding:34px 38px;border-radius:24px;background:linear-gradient(120deg,#0b766e,#145b68);color:#fff;box-shadow:var(--shadow)}.hero-copy{max-width:660px}.eyebrow{font-size:.72rem;letter-spacing:1.8px;font-weight:800;color:var(--accent)}.hero .eyebrow{color:#a9eee0}.hero h1{font-size:clamp(1.7rem,3vw,2.5rem);line-height:1.3;margin:7px 0 9px}.hero p{color:#d8f0eb;margin:0;max-width:650px}.hero-progress{width:min(290px,100%);flex:0 0 290px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);padding:18px;border-radius:17px}.progress-head{display:flex;justify-content:space-between;gap:10px;font-size:.86rem}.progress-track{height:9px;background:rgba(255,255,255,.22);border-radius:30px;margin:12px 0 8px;overflow:hidden}.progress-track i{display:block;width:0;height:100%;background:#b8f0dc;border-radius:30px;transition:width .3s}.hero-progress small{color:#d5eee8;font-size:.77rem}.course-layout{display:grid;grid-template-columns:310px minmax(0,1fr);gap:22px;align-items:start;margin-top:24px}.sidebar,.lesson-panel{background:var(--paper);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}.sidebar{padding:18px;position:sticky;top:16px;max-height:calc(100vh - 32px);overflow:auto}.sidebar-title{display:flex;align-items:center;justify-content:space-between}.sidebar-title h2{margin:2px 0 0;font-size:1.25rem}.count-pill{background:var(--accent-soft);color:var(--accent);font-weight:800;border-radius:99px;padding:3px 10px;font-size:.8rem}.search-wrap{display:flex;align-items:center;gap:9px;border:1px solid var(--line);border-radius:12px;padding:7px 12px;margin:17px 0 10px;color:var(--muted)}.search-wrap input{border:0;outline:0;background:transparent;color:var(--ink);font:inherit;width:100%;font-size:.88rem}.filter-row{display:flex;gap:6px;margin:9px 0 13px}.filter{flex:1;border:1px solid var(--line);background:transparent;color:var(--muted);border-radius:9px;padding:6px;font:inherit;font-size:.8rem}.filter.active{background:var(--accent-soft);border-color:var(--accent);color:var(--accent);font-weight:800}.lesson-list{display:grid;gap:7px}.lesson-link{display:grid;grid-template-columns:32px 1fr auto;align-items:center;gap:9px;text-align:right;border:1px solid transparent;background:transparent;border-radius:11px;padding:9px 8px;color:var(--ink);cursor:pointer;font:inherit}.lesson-link:hover{background:var(--bg)}.lesson-link.active{background:var(--accent-soft);border-color:#8ed1c3}.lesson-num{width:29px;height:29px;display:grid;place-items:center;border-radius:9px;background:var(--bg);font-size:.76rem;font-weight:800;color:var(--muted)}.lesson-link.active .lesson-num{background:var(--accent);color:white}.lesson-link strong{font-size:.83rem;line-height:1.45}.lesson-link small{display:block;color:var(--muted);font-size:.69rem}.done-mark{color:var(--accent);font-weight:900}.sidebar-resource{border-top:1px solid var(--line);margin-top:16px;padding-top:14px;display:grid;gap:7px}.sidebar-resource strong{font-size:.86rem;margin-bottom:2px}.sidebar-resource a{color:var(--accent);font-size:.8rem;text-decoration:none}.sidebar-resource a:hover{text-decoration:underline}.lesson-panel{min-height:780px;padding:clamp(22px,4vw,42px);max-width:100%;overflow:hidden}.lesson-head{border-bottom:1px solid var(--line);padding-bottom:22px;margin-bottom:22px}.lesson-meta{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.tag{display:inline-flex;background:var(--accent-soft);color:var(--accent);padding:3px 10px;border-radius:99px;font-size:.75rem;font-weight:800}.lesson-head h2{font-size:clamp(1.55rem,3vw,2.15rem);line-height:1.4;margin:12px 0 5px}.lesson-head p{color:var(--muted);margin:0;max-width:850px}.lesson-section{margin:24px 0}.lesson-section h3{font-size:1.16rem;margin:0 0 10px;display:flex;gap:9px;align-items:center}.lesson-section h3:before{content:"";width:5px;height:21px;border-radius:5px;background:var(--accent)}.lesson-section p{margin:8px 0}.callout{background:var(--accent-soft);border-right:4px solid var(--accent);padding:13px 16px;border-radius:10px;margin:14px 0}.callout strong{color:var(--accent)}.example-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:12px 0}.example{border:1px solid var(--line);background:var(--bg);border-radius:13px;padding:13px 15px;min-width:0}.example .de{direction:ltr;text-align:left;font-weight:800;font-size:1.06rem;unicode-bidi:isolate}.example .ar{color:var(--muted);font-size:.9rem;margin-top:3px}.example .why{font-size:.79rem;color:var(--accent);margin-top:7px}.grammar-table{width:100%;border-collapse:separate;border-spacing:0;margin:13px 0;border:1px solid var(--line);border-radius:12px;overflow:hidden}.grammar-table th,.grammar-table td{padding:10px 12px;text-align:center;border-bottom:1px solid var(--line);border-left:1px solid var(--line)}.grammar-table th{background:var(--accent-soft);color:var(--accent);font-size:.86rem}.grammar-table tr:last-child td{border-bottom:0}.grammar-table td{font-size:.9rem}.mistake-box{background:rgba(214,155,70,.10);border:1px solid rgba(214,155,70,.35);border-radius:12px;padding:13px 16px}.mistake-box strong{display:block;margin-bottom:5px}.exercise{border:1px solid var(--line);border-radius:15px;padding:18px;margin:13px 0;background:var(--bg)}.exercise-title{font-weight:800;margin-bottom:8px}.exercise-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.answer-option{border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:10px;padding:10px;text-align:center;font:inherit;cursor:pointer}.answer-option:hover{border-color:var(--accent)}.answer-option.correct{background:#e0f5e8;border-color:#57a879;color:#17633b}.answer-option.wrong{background:#fde8e7;border-color:#d77a74;color:#9d2828}.exercise-feedback{margin-top:10px;padding:9px 12px;border-radius:9px;font-size:.88rem;display:none}.exercise-feedback.show{display:block}.exercise-feedback.good{background:#e0f5e8;color:#17633b}.exercise-feedback.bad{background:#fde8e7;color:#9d2828}.lesson-actions{display:flex;gap:9px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:20px;margin-top:28px}.action-btn{border:1px solid var(--line);background:var(--paper);color:var(--ink);padding:9px 15px;border-radius:10px;font:inherit;font-weight:700;cursor:pointer}.action-btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}.action-btn:disabled{opacity:.45;cursor:not-allowed}.vocab-map{margin-top:34px}.vocab-map>div:first-child h2{margin:4px 0;font-size:1.4rem}.vocab-map>div:first-child p{margin:0;color:var(--muted)}.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:16px}.topic-grid article{background:var(--paper);border:1px solid var(--line);border-radius:15px;padding:15px;box-shadow:var(--shadow)}.topic-grid article>span{color:var(--accent);font-weight:900;font-size:.75rem}.topic-grid h3{font-size:.96rem;margin:5px 0}.topic-grid p{font-size:.8rem;color:var(--muted);margin:0}.scope-note{text-align:center;color:var(--muted);font-size:.82rem;margin:22px 0 0}footer{text-align:center;color:var(--muted);padding:22px 10px 30px;font-size:.82rem}
@media(max-width:950px){.course-layout{grid-template-columns:260px minmax(0,1fr)}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero{padding:27px}.hero-progress{flex-basis:250px;width:250px}}
@media(max-width:700px){.topbar{height:66px;padding:0 15px}.brand strong{font-size:.9rem}.back-link{font-size:.76rem}.layout{padding:16px 12px 40px}.hero{display:block;padding:23px 20px;border-radius:18px}.hero-progress{width:100%;margin-top:20px}.course-layout{grid-template-columns:1fr;gap:13px}.sidebar{position:static;max-height:none;padding:14px}.lesson-list{grid-template-columns:repeat(2,minmax(0,1fr));max-height:250px;overflow:auto}.lesson-link{grid-template-columns:27px 1fr auto;padding:7px 5px}.lesson-link strong{font-size:.75rem}.lesson-num{width:25px;height:25px}.lesson-panel{min-height:0;padding:20px 15px}.example-grid{grid-template-columns:1fr}.topic-grid{grid-template-columns:1fr 1fr}.exercise-options{grid-template-columns:1fr 1fr}.grammar-table{font-size:.78rem}.grammar-table th,.grammar-table td{padding:7px 5px}}
@media(max-width:390px){.lesson-list,.topic-grid{grid-template-columns:1fr}.exercise-options{grid-template-columns:1fr}.back-link span{display:none}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.level-row{display:grid;grid-template-columns:1.35fr repeat(3,1fr);gap:6px;margin:12px 0 8px}.level-filter{border:1px solid var(--line);background:transparent;color:var(--muted);border-radius:9px;padding:7px 5px;font:inherit;font-size:.78rem;font-weight:800;cursor:pointer}.level-filter.active{background:var(--accent);border-color:var(--accent);color:#fff}.lesson-link small{direction:rtl}.lesson-meta .tag:first-child{font-weight:900}

/* Level exams */
.exam-entry{width:100%;margin:10px 0 4px;padding:12px 14px;border:1px solid #b8dcd7;border-radius:12px;background:#eaf7f5;color:#075e57;font:inherit;font-weight:800;cursor:pointer;text-align:center}
.exam-entry:hover{background:#dff2ef}
.exam-home,.exam-view{background:var(--panel,#fff);border:1px solid var(--line,#e5e7eb);border-radius:18px;padding:clamp(18px,3vw,30px);box-shadow:0 8px 30px rgba(20,40,50,.05)}
.exam-home h2,.exam-view h2{margin:8px 0}.exam-intro{color:var(--muted,#64748b);line-height:1.9}
.exam-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:22px}
.exam-card{border:1px solid var(--line,#e5e7eb);border-radius:15px;padding:18px;background:var(--surface,#fafafa)}
.exam-card h3{margin:0 0 8px}.exam-card p{line-height:1.7;color:var(--muted,#64748b);font-size:.93rem}.exam-card button,.exam-submit,.exam-back{border:0;border-radius:10px;padding:11px 15px;font:inherit;font-weight:800;cursor:pointer}
.exam-card button,.exam-submit{background:#087f75;color:white}.exam-back{background:#eef2f5;color:#263746;margin-inline-start:8px}
.exam-question{padding:17px 0;border-bottom:1px solid var(--line,#e5e7eb)}.exam-question:last-child{border:0}.exam-question h3{font-size:1.03rem;margin:0 0 12px}
.exam-options{display:flex;flex-wrap:wrap;gap:8px}.exam-options button{border:1px solid var(--line,#d7dee5);border-radius:10px;padding:9px 13px;background:var(--surface,#fff);color:var(--text,inherit);font:inherit;cursor:pointer}.exam-options button.selected{border-color:#087f75;background:#e4f5f2;color:#075e57;font-weight:800}.exam-options button:disabled{cursor:default}
.exam-result{margin:20px 0;padding:20px;border-radius:14px;background:#eef8f5;line-height:1.8}.exam-result strong{font-size:1.3rem}.exam-result.pass{background:#e8f7ed}.exam-result.fail{background:#fff4e8}.exam-result .review-item{padding:10px 0;border-top:1px solid rgba(0,0,0,.08)}
@media(max-width:760px){.exam-cards{grid-template-columns:1fr}}

/* manual theme (ui.js) */
:root[data-theme="light"]{color-scheme:light;--bg:#f3f7f6;--paper:#fff;--ink:#172d2b;--muted:#687d79;--line:#dce7e3;--accent:#0b766e;--accent-soft:#e2f4ef;--gold:#d69b46;--shadow:0 10px 35px rgba(19,55,49,.06)}
:root[data-theme="dark"]{color-scheme:dark;--bg:#101b1a;--paper:#182725;--ink:#edf6f2;--muted:#a3b8b1;--line:#304440;--accent:#45c5b3;--accent-soft:#1b3d37;--shadow:0 10px 35px rgba(0,0,0,.18)}

/* V42: فهرس واضح أعلى الصفحة، ودرس بعرض كامل */
.course-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:18px}
.course-layout .sidebar{position:static;max-height:none;overflow:visible;padding:22px}
.course-layout .lesson-list{display:grid;grid-template-columns:minmax(0,1fr);gap:7px;max-height:315px;overflow:auto;border:1px solid var(--line);border-radius:14px;padding:8px;background:var(--bg)}
.course-layout .lesson-link{display:grid;grid-template-columns:38px minmax(0,1fr) 33px;min-height:58px;padding:9px 13px;background:var(--paper);border:1px solid var(--line)}
.course-layout .lesson-link strong{font-size:.97rem}.course-layout .lesson-link small{font-size:.8rem}
.course-layout .lesson-link.locked{opacity:.7;cursor:not-allowed}.course-layout .lesson-link.locked .done-mark{color:var(--muted)}
.lesson-panel{min-height:460px}.lesson-panel .path-note{border:1px solid var(--line);border-radius:13px;padding:15px 18px;background:var(--accent-soft);margin:15px 0;color:var(--ink)}
@media(max-width:700px){.course-layout .sidebar{padding:15px}.course-layout .lesson-list{grid-template-columns:1fr;max-height:290px}.course-layout .lesson-link{min-height:54px}.lesson-panel{min-height:0}}

/* Accounts: optional cloud profile and gentle sync notice */
.cloud-account-link{display:inline-flex;align-items:center;padding:8px 12px;border:1px solid var(--line);border-radius:12px;color:var(--ink);text-decoration:none;background:var(--card,var(--paper,#fff));font-weight:650;white-space:nowrap}
.cloud-fresh-notice{position:fixed;bottom:16px;left:16px;right:auto;max-width:min(430px,calc(100vw - 32px));z-index:1000;padding:13px 16px;background:var(--card,var(--paper,#fff));color:var(--ink);border:1px solid var(--line);border-radius:13px;box-shadow:0 8px 32px rgba(0,0,0,.15);line-height:1.7}
.cloud-fresh-notice a{color:var(--acc,var(--accent));font-weight:800;margin-inline-start:7px}
/* V43: prevent course navigation from overflowing narrow phone screens. */
@media(max-width:850px){.topbar{height:auto;min-height:70px;display:flex;flex-wrap:wrap;justify-content:flex-start;align-items:center;gap:7px;padding:12px 15px}.topbar .brand{flex-basis:100%;margin-bottom:5px}.topbar>a:not(.brand){flex:0 1 auto;border:1px solid var(--line);border-radius:10px;padding:5px 8px;max-width:100%;font-size:.78rem}.topbar .cloud-account-link{background:var(--paper)}}


/* V54: unified, comfortable navigation on lessons page. */
.topbar{height:auto;min-height:78px;display:flex;flex-wrap:wrap;
  align-items:center;justify-content:flex-start;gap:9px 11px;
  padding:14px clamp(14px,3vw,25px);box-sizing:border-box}
.topbar .brand{margin-inline-end:auto;flex-shrink:0}
.topbar>a:not(.brand){display:inline-flex;align-items:center;justify-content:center;
  background:var(--paper);border:1px solid var(--line);border-radius:12px;
  min-height:41px;padding:8px 12px;color:var(--ink);text-decoration:none;
  font-size:.84rem;font-weight:650;white-space:nowrap}
.topbar>a:not(.brand):hover,.topbar>a:not(.brand):focus-visible{
  background:var(--accent-soft);border-color:var(--accent)}
@media(max-width:760px){
  .topbar{gap:8px;padding:14px 13px;justify-content:flex-start}
  .topbar .brand{flex-basis:100%;margin:0 0 4px}
  .topbar>a:not(.brand){font-size:.8rem;min-height:42px}
}