:root{--bc-green:#0b6b4f;--bc-ink:#14251f;--bc-muted:#6d7d76;--bc-line:#dce3dc;--bc-cream:#f6f4ec;--bc-lime:#d9f36a}.bcapp-root{min-height:100vh;background:var(--bc-cream);color:var(--bc-ink);font-family:"Segoe UI",Tahoma,Arial,sans-serif}.bcapp-root *{box-sizing:border-box}.bcapp-root button,.bcapp-root input{font:inherit}.bc-top{height:76px;padding:0 6vw;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--bc-line);background:#fff}.bc-top>a{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--bc-ink)}.bc-top>a>b{width:43px;height:43px;display:grid;place-items:center;border-radius:13px;background:var(--bc-green);color:var(--bc-lime)}.bc-top strong,.bc-top small{display:block}.bc-top small{font-size:10px;color:var(--bc-muted)}.bc-top>button{border:1px solid var(--bc-line);background:#fff;padding:9px 13px;border-radius:9px}.bc-content{width:min(1180px,92vw);margin:auto;padding:45px 0 80px}.bc-primary{border:0!important;background:var(--bc-green)!important;color:#fff!important;padding:12px 20px!important;border-radius:10px!important;font-weight:800}.bc-error{background:#fff0ef;color:#9f2d2d;padding:10px;border-radius:9px;font-size:12px}.bc-auth{min-height:calc(100vh - 166px);display:grid;grid-template-columns:1fr 470px;gap:7vw;align-items:center}.bc-auth>div:first-child{padding:45px;border-radius:25px;background:linear-gradient(145deg,#123e31,#075b42);color:#fff}.bc-auth h1{font-size:55px;line-height:1.1;margin:15px 0}.bc-auth>div p{color:#c0d6cd}.bc-auth form,.bc-create,.bc-progress,.bc-lessons,.bc-table{background:#fff;border:1px solid var(--bc-line);border-radius:20px;padding:24px}.bc-tabs{display:grid;grid-template-columns:1fr 1fr;background:#f1f4f0;padding:4px;border-radius:10px}.bc-tabs button{border:0;background:transparent;padding:10px;border-radius:8px}.bc-tabs button.active{background:#fff;color:var(--bc-green);font-weight:800}.bc-auth label{display:block;font-size:12px;font-weight:700;margin:11px 0}.bc-auth input,.bc-create input,.bc-join input{display:block;width:100%;margin-top:6px;padding:12px;border:1px solid var(--bc-line);border-radius:9px}.bc-auth form>.bc-primary{width:100%;margin-top:15px}.bc-auth #bc-roles{display:grid;grid-template-columns:1fr 1fr;gap:8px}.bc-auth #bc-roles button{padding:12px;border:1px solid var(--bc-line);background:#fff;border-radius:10px}.bc-auth #bc-roles button.selected{border-color:var(--bc-green);background:#eff9f4}.bc-heading small{color:var(--bc-green);font-weight:800}.bc-heading h1{font-size:38px;margin:6px 0}.bc-heading p{color:var(--bc-muted)}.bc-create form{display:grid;grid-template-columns:1fr 1fr auto;gap:9px}.bc-create input{margin:0}.bc-class-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0}.bc-class-grid article{display:flex;align-items:center;gap:11px;background:#fff;border:1px solid var(--bc-line);border-radius:14px;padding:14px;cursor:pointer}.bc-class-grid article>span{width:38px;height:38px;display:grid;place-items:center;background:#e6f4ed;color:var(--bc-green);border-radius:11px}.bc-class-grid article>div{flex:1}.bc-class-grid strong,.bc-class-grid small,.bc-class-grid code{display:block}.bc-class-grid small{color:var(--bc-muted)}.bc-class-grid code{color:var(--bc-green);font-size:10px}.bc-class-grid aside{display:flex;gap:4px}.bc-class-grid aside button{border:1px solid var(--bc-line);background:#fff;border-radius:6px}.bc-empty{text-align:center;padding:32px;border:1px dashed var(--bc-line);border-radius:15px;color:var(--bc-muted);grid-column:1/-1}.bc-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0}.bc-stats>div{background:#fff;border:1px solid var(--bc-line);border-radius:15px;padding:18px}.bc-stats small,.bc-stats b{display:block}.bc-stats small{color:var(--bc-muted)}.bc-stats b{font-size:30px;margin-top:8px}.bc-table>div{display:grid;grid-template-columns:1fr 2fr .6fr .7fr 1fr;gap:12px;padding:12px;border-bottom:1px solid #edf0ec;font-size:12px}.bc-table .head{color:var(--bc-muted);font-weight:800}.bc-join,.bc-result{max-width:520px;margin:80px auto;text-align:center;background:#fff;border:1px solid var(--bc-line);border-radius:22px;padding:35px}.bc-join>span{width:60px;height:60px;display:grid;place-items:center;margin:auto;background:var(--bc-lime);color:var(--bc-green);border-radius:18px;font-size:25px}.bc-join form{display:grid;gap:10px}.bc-progress{margin:25px 0}.bc-progress>div{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.bc-progress article{border:1px solid var(--bc-line);border-radius:13px;padding:14px}.bc-progress small,.bc-progress strong,.bc-progress b,.bc-progress span{display:block}.bc-progress small{color:var(--bc-green)}.bc-progress strong{font-size:12px;min-height:38px}.bc-progress b{font-size:22px;margin:7px 0}.bc-progress i{display:block;height:6px;background:#edf0ec;border-radius:8px}.bc-progress em{display:block;height:100%;background:var(--bc-green);border-radius:8px}.bc-progress span{font-size:9px;color:var(--bc-muted);margin-top:8px}.bc-lessons>div{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.bc-lessons button{overflow:hidden;text-align:right;border:1px solid var(--bc-line);background:#fff;border-radius:16px;padding:0;color:var(--bc-ink)}.bc-lessons button>span{height:105px;display:flex;align-items:center;justify-content:space-between;padding:18px;color:#fff;background:linear-gradient(135deg,#164e3d,#0b6b4f)}.bc-lessons .electricity>span{background:linear-gradient(135deg,#163b59,#1f7393)}.bc-lessons .optics>span{background:linear-gradient(135deg,#402d68,#835eac)}.bc-lessons .chemistry>span{background:linear-gradient(135deg,#8a5217,#d48a27)}.bc-lessons .organic>span{background:linear-gradient(135deg,#48671f,#85a62b)}.bc-lessons .matter>span{background:linear-gradient(135deg,#335b57,#52a095)}.bc-lessons button>span i{font-size:30px;font-style:normal}.bc-lessons button>span em{font-style:normal;opacity:.7}.bc-lessons button>small,.bc-lessons button>strong,.bc-lessons button>b{display:block;margin:12px 15px}.bc-lessons button>small{color:var(--bc-green)}.bc-lessons button>strong{font-size:13px;min-height:38px}.bc-lessons button>b{border-top:1px solid var(--bc-line);padding-top:10px;color:var(--bc-green);font-size:11px}.bc-quiz{max-width:900px;margin:auto}.bc-quiz header{display:flex;justify-content:space-between;margin-bottom:18px}.bc-q{background:#fff;border:1px solid var(--bc-line);border-radius:22px;padding:30px}.bc-q h2{text-align:left;line-height:1.6}.bc-q>button{width:100%;display:flex;align-items:center;gap:13px;text-align:left;margin:9px 0;padding:13px;border:1px solid var(--bc-line);border-radius:12px;background:#fafbf8}.bc-q>button.selected{border-color:var(--bc-green);background:#eff9f4}.bc-q>button span{width:34px;height:34px;display:grid;place-items:center;border:1px solid var(--bc-line);border-radius:8px}.bc-q footer{display:flex;justify-content:space-between;margin-top:22px}.bc-q footer button{padding:11px 18px;border:1px solid var(--bc-line);background:#fff;border-radius:9px}.bc-result h1{font-size:70px;color:var(--bc-green);margin:10px}.bcapp-loading{text-align:center;padding:80px}
@media(max-width:850px){.bc-auth{grid-template-columns:1fr}.bc-auth>div:first-child{display:none}.bc-class-grid,.bc-lessons>div,.bc-progress>div{grid-template-columns:1fr 1fr}.bc-create form{grid-template-columns:1fr}.bc-table{overflow:auto}.bc-table>div{min-width:720px}}
@media(max-width:580px){.bc-class-grid,.bc-lessons>div,.bc-progress>div{grid-template-columns:1fr}.bc-content{padding-top:25px}.bc-heading h1{font-size:29px}.bc-q{padding:18px}.bc-q h2{font-size:19px}}

/* Learning journey, protected reader and revision experience */
.bcapp-root{position:relative}.bcapp-root:after{content:attr(data-watermark);position:fixed;inset:auto 18px 16px auto;z-index:9999;font-size:10px;color:rgba(11,107,79,.35);pointer-events:none}.bc-flow{display:flex;align-items:center;justify-content:center;gap:14px;margin:24px 0;padding:18px;border:1px solid var(--bc-line);border-radius:18px;background:#fff}.bc-flow>div{display:flex;align-items:center;gap:10px}.bc-flow>div>b{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--bc-green);color:#fff}.bc-flow strong,.bc-flow small{display:block}.bc-flow small{color:var(--bc-muted);font-size:10px}.bc-flow>i{color:var(--bc-green);font-style:normal}.bc-lessons>header{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:18px}.bc-lessons>header h2{margin:3px 0}.bc-lessons>header small{color:var(--bc-green);font-weight:800}.bc-lessons>header p{color:var(--bc-muted);font-size:13px}.bc-lessons article{border:1px solid var(--bc-line);border-radius:16px;overflow:hidden;background:#fff}.bc-lessons article>button:first-child{width:100%;overflow:hidden;text-align:right;border:0;background:#fff;padding:0;color:var(--bc-ink)}.bc-lessons .bc-review-shortcut{width:100%;padding:11px;border:0;border-top:1px solid var(--bc-line);background:#f7faf8;color:var(--bc-green);font-weight:750;font-size:11px}.bc-lessons article:hover{transform:translateY(-3px);box-shadow:0 14px 35px rgba(20,37,31,.09);transition:.2s}.bc-result.needs-review{border-top:6px solid #e1a128}.bc-result.passed{border-top:6px solid var(--bc-green)}.bc-support{padding:15px;margin:16px 0;background:#fff7df;border-radius:12px}.bc-support strong,.bc-support span{display:block}.bc-support span{font-size:12px;color:#745512;margin-top:5px}.bc-result-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:8px}.bc-result-actions button{padding:11px 15px;border:1px solid var(--bc-line);background:#fff;border-radius:9px}.bc-reader{position:relative;background:#fff;border:1px solid var(--bc-line);border-radius:22px;overflow:hidden;box-shadow:0 20px 60px rgba(20,37,31,.08)}.bc-reader>header{display:flex;justify-content:space-between;align-items:start;padding:25px 28px;background:linear-gradient(135deg,#0c654c,#133f33);color:#fff}.bc-reader>header small{color:var(--bc-lime);font-weight:800}.bc-reader>header h1{margin:5px 0;font-size:30px}.bc-reader>header p{margin:0;color:#d7e8e1}.bc-reader>header>button{width:38px;height:38px;border:1px solid rgba(255,255,255,.3);border-radius:10px;background:transparent;color:#fff;font-size:24px}.bc-reader-tabs{display:flex;gap:7px;padding:12px 18px;overflow:auto;border-bottom:1px solid var(--bc-line);background:#f8faf8;position:sticky;top:0;z-index:3}.bc-reader-tabs button{white-space:nowrap;border:1px solid var(--bc-line);background:#fff;padding:8px 13px;border-radius:999px;color:var(--bc-ink)}.bc-reader-tabs button.active{background:var(--bc-green);border-color:var(--bc-green);color:#fff}.bc-lesson-content{position:relative;max-width:920px;margin:auto;padding:32px 38px;font-family:"Segoe UI",Arial,sans-serif;line-height:1.8;color:#24342e;user-select:none}.bc-lesson-content h1{font-size:30px;color:#123f33}.bc-lesson-content h2{font-size:23px;color:#0b6b4f;border-bottom:2px solid #dceae4;padding-bottom:7px}.bc-lesson-content h3{font-size:18px;color:#245e4d}.bc-lesson-content p{text-align:justify}.bc-lesson-content .box,.bc-lesson-content .formula-box,.bc-lesson-content .summary-box,.bc-lesson-content .example-box{margin:15px 0;padding:16px;border:1px solid #dce7e1;border-inline-start:5px solid var(--bc-green);border-radius:12px;background:#fbfdfb}.bc-lesson-content table{width:100%;border-collapse:collapse;margin:15px 0}.bc-lesson-content th,.bc-lesson-content td{padding:9px;border:1px solid var(--bc-line)}.bc-lesson-content th{background:#eff7f3}.bc-lesson-content [data-reveal]{padding:8px 12px;margin:6px 0;border:1px solid var(--bc-line);border-radius:8px;background:#f4f8f5;color:var(--bc-green)}.bc-lesson-content .answer-content{display:none;padding:12px;border-radius:9px;background:#eff7f3}.bc-lesson-content .answer-content.is-visible{display:block}.bc-media-note{padding:11px;border-radius:9px;background:#f3f5f4;color:var(--bc-muted);font-size:12px}.bc-reader>footer{display:flex;justify-content:space-between;gap:10px;padding:18px 28px;border-top:1px solid var(--bc-line);background:#f8faf8}.bc-reader>footer button{padding:11px 16px;border:1px solid var(--bc-line);background:#fff;border-radius:9px}
@media(max-width:580px){.bc-flow{align-items:stretch;flex-direction:column}.bc-flow>i{display:none}.bc-lessons>header{display:block}.bc-reader>header h1{font-size:22px}.bc-lesson-content{padding:22px 16px;font-size:14px}.bc-reader>footer{flex-direction:column}.bc-reader>footer button{width:100%}}
@media print{.bcapp-root{display:none!important}}
.bc-lessons .mechanics button>span{background:linear-gradient(135deg,#164e3d,#0b6b4f)}.bc-lessons .electricity button>span{background:linear-gradient(135deg,#163b59,#1f7393)}.bc-lessons .optics button>span{background:linear-gradient(135deg,#402d68,#835eac)}.bc-lessons .chemistry button>span{background:linear-gradient(135deg,#8a5217,#d48a27)}.bc-lessons .organic button>span{background:linear-gradient(135deg,#48671f,#85a62b)}.bc-lessons .matter button>span{background:linear-gradient(135deg,#335b57,#52a095)}

/* Role-aware navigation and student dashboard */
.bc-main-nav{display:flex;align-items:center;gap:5px;padding:5px;border:1px solid var(--bc-line);border-radius:13px;background:#f7faf8}.bc-main-nav button{border:0;background:transparent;padding:8px 12px;border-radius:9px;color:var(--bc-ink);cursor:pointer}.bc-main-nav button:hover{background:#e8f4ee;color:var(--bc-green)}.bc-student-heading{display:flex;align-items:center;justify-content:space-between;gap:18px}.bc-student-heading>button{padding:11px 16px;border:1px solid var(--bc-line);border-radius:10px;background:#fff;color:var(--bc-green);font-weight:750}.bc-onboarding{display:flex;align-items:center;gap:16px;margin:20px 0;padding:18px 22px;border:1px solid #efcf83;border-radius:16px;background:#fff8e7}.bc-onboarding strong,.bc-onboarding span{display:block}.bc-onboarding span{flex:1;color:#765c24;font-size:13px}.bc-student-stats{grid-template-columns:repeat(4,1fr)}.bc-subjects{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:24px 0}.bc-subjects button{position:relative;min-height:190px;padding:26px;border:0;border-radius:22px;text-align:right;color:#fff;cursor:pointer;overflow:hidden;box-shadow:0 15px 35px rgba(20,37,31,.13)}.bc-subjects button:first-child{background:linear-gradient(135deg,#123f62,#2385a8)}.bc-subjects button:last-child{background:linear-gradient(135deg,#7b4919,#d28a2b)}.bc-subjects button:after{content:'';position:absolute;width:170px;height:170px;border:1px solid rgba(255,255,255,.22);border-radius:50%;inset:-55px auto auto -55px}.bc-subjects span,.bc-subjects strong,.bc-subjects small,.bc-subjects b{display:block;position:relative;z-index:1}.bc-subjects span{font-size:11px;letter-spacing:2px;opacity:.8}.bc-subjects strong{font-size:36px;margin:20px 0 5px}.bc-subjects small{opacity:.85}.bc-subjects b{margin-top:20px}.bc-lessons article.locked{opacity:.72}.bc-settings{display:grid;grid-template-columns:1.1fr .9fr;gap:18px;align-items:start}.bc-settings>form,.bc-settings>.bc-join{margin:0;max-width:none;background:#fff;border:1px solid var(--bc-line);border-radius:20px;padding:24px}.bc-settings label{display:block;margin:13px 0;font-weight:700;font-size:12px}.bc-settings input{display:block;width:100%;margin-top:6px;padding:12px;border:1px solid var(--bc-line);border-radius:9px}.bc-settings label small{color:var(--bc-muted);font-weight:400}.bc-success{padding:11px;border-radius:9px;background:#eaf8f0;color:var(--bc-green)}.bc-join.compact{text-align:right}.bc-join.compact>span{margin:0 0 14px auto}.bc-join.compact form{margin-top:18px}
@media(max-width:850px){.bc-top{height:auto;min-height:76px;flex-wrap:wrap;gap:10px;padding-top:10px;padding-bottom:10px}.bc-main-nav{order:3;width:100%;overflow:auto}.bc-main-nav button{flex:1;white-space:nowrap}.bc-student-stats{grid-template-columns:1fr 1fr}.bc-settings{grid-template-columns:1fr}}
@media(max-width:580px){.bc-student-heading{display:block}.bc-student-heading>button{margin-top:12px}.bc-onboarding{align-items:stretch;flex-direction:column}.bc-subjects{grid-template-columns:1fr}.bc-subjects button{min-height:160px}.bc-student-stats{grid-template-columns:1fr 1fr}}
.bc-q>footer{display:flex!important;visibility:visible!important;align-items:center;justify-content:space-between;margin-top:22px;padding-top:16px;border-top:1px solid var(--bc-line)}.bc-q>footer>span{color:var(--bc-muted);font-weight:800}.bc-q>footer>button{display:inline-flex!important;visibility:visible!important;padding:11px 18px;border:1px solid var(--bc-line);background:#fff;border-radius:9px}
.bc-lesson-content img{display:block;max-width:100%;height:auto;margin:20px auto;border-radius:14px;box-shadow:0 8px 24px rgba(20,37,31,.1)}.bc-simulations{padding:25px 28px;border-top:1px solid var(--bc-line);background:#f5faf7}.bc-simulations h2{margin:0 0 4px;color:var(--bc-green)}.bc-simulations>p{margin-top:0;color:var(--bc-muted)}.bc-simulations>div{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.bc-simulations button{display:grid;grid-template-columns:auto 1fr;gap:3px 10px;text-align:right;padding:14px;border:1px solid var(--bc-line);border-radius:12px;background:#fff;color:var(--bc-ink)}.bc-simulations button>span{grid-row:1/3;display:grid;place-items:center;width:38px;height:38px;border-radius:50%;background:var(--bc-green);color:#fff}.bc-simulations button>small{color:var(--bc-green)}.bc-sim-modal[hidden]{display:none}.bc-sim-modal{position:fixed;z-index:100000;inset:0;display:grid;place-items:center;padding:3vw;background:rgba(10,25,20,.82)}.bc-sim-modal>div{position:relative;width:min(1100px,96vw);height:min(760px,90vh);padding:48px 12px 12px;border-radius:18px;background:#fff}.bc-sim-modal h3{position:absolute;top:13px;right:20px;margin:0}.bc-sim-modal [data-close-sim]{position:absolute;top:9px;left:12px;width:34px;height:34px;border:0;border-radius:9px;background:#edf3ef;font-size:24px}.bc-sim-modal iframe{width:100%;height:100%;border:1px solid var(--bc-line);border-radius:12px;background:#fff}@media(max-width:700px){.bc-simulations>div{grid-template-columns:1fr}.bc-sim-modal{padding:8px}.bc-sim-modal>div{width:100%;height:92vh}}
.bc-lesson-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.bc-lesson-group{margin:8px 0 30px}.bc-lesson-group>h2{margin:0 0 14px;padding:0 4px 10px;border-bottom:1px solid var(--bc-line);color:var(--bc-green)}.bc-lesson-content .btn-video{cursor:pointer}body.bc-sim-open{overflow:hidden!important}.bc-sim-modal[hidden]{display:none!important}.bc-sim-modal{position:fixed!important;z-index:2147483000!important;inset:0!important;display:flex!important;align-items:center!important;justify-content:center!important;padding:20px!important;background:rgba(10,25,20,.82)!important;direction:rtl}.bc-sim-modal>div{position:relative!important;width:min(1100px,calc(100vw - 40px))!important;height:min(760px,calc(100dvh - 40px))!important;padding:52px 12px 12px!important;border-radius:18px!important;background:#fff!important;box-shadow:0 24px 80px rgba(0,0,0,.35)!important;overflow:hidden!important}.bc-sim-modal h3{position:absolute;top:15px;right:20px;left:60px;margin:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#123f33;font-size:18px}.bc-sim-modal [data-close-sim]{position:absolute;z-index:2;top:10px;left:12px;width:36px;height:36px;border:0;border-radius:9px;background:#e8f1ec;color:#123f33;font-size:25px;line-height:1;cursor:pointer}.bc-sim-modal iframe{display:block!important;width:100%!important;height:100%!important;border:1px solid var(--bc-line);border-radius:12px;background:#fff}@media(max-width:850px){.bc-lesson-grid{grid-template-columns:1fr 1fr}}@media(max-width:580px){.bc-lesson-grid{grid-template-columns:1fr}.bc-sim-modal{padding:0!important}.bc-sim-modal>div{width:100vw!important;height:100dvh!important;max-width:none!important;max-height:none!important;padding:52px 0 0!important;border-radius:0!important}.bc-sim-modal iframe{border:0!important;border-radius:0!important}.bc-sim-modal h3{font-size:15px;top:16px;right:12px}}