[hidden]{display:none!important}
*{box-sizing:border-box} :root{--bg:#0B0B0D;--panel:#17171B;--panel2:#111114;--line:#2a2a31;--text:#fff;--muted:#A1A1AA;--soft:#E7E7EA;--orange:#FF6A00;--orange2:#FF934D;--danger:#ff5d5d;--success:#3ddc84} html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif} body{min-height:100vh} button,input,textarea,select{font:inherit} button{cursor:pointer}.card{background:linear-gradient(180deg,#18181d,#151519);border:1px solid var(--line);border-radius:20px}.login-shell{min-height:100vh;display:grid;grid-template-columns:1fr 420px;gap:80px;align-items:center;max-width:1100px;margin:auto;padding:40px}.login-brand{display:flex;align-items:center;gap:18px}.brand-mark{width:58px;height:58px;border-radius:17px;background:linear-gradient(135deg,var(--orange),var(--orange2));display:grid;place-items:center;font-weight:900}.brand-mark.small{width:38px;height:38px;border-radius:11px;font-size:12px}.brand-name{font-size:28px;font-weight:750}.brand-name strong{color:var(--orange)}.login-brand p,.section-head p,.lessons-toolbar p{color:var(--muted);margin:6px 0 0}.login-card{padding:32px}.eyebrow{color:var(--orange2);font-size:12px;font-weight:800;letter-spacing:.12em}.login-card h1,.topbar h1,.dialog h2{margin:8px 0 8px}.login-card>p{color:var(--muted);margin:0 0 26px;line-height:1.5}label{display:block;font-weight:700;font-size:13px;margin:16px 0 8px}input,textarea,select{width:100%;background:#0e0e11;border:1px solid var(--line);color:var(--text);border-radius:12px;padding:13px 14px;outline:none}input:focus,textarea:focus,select:focus{border-color:#5b3a27;box-shadow:0 0 0 3px rgba(255,106,0,.08)}textarea{resize:vertical}.password-wrap{position:relative}.password-wrap input{padding-right:60px}.text-btn{position:absolute;right:8px;top:50%;transform:translateY(-50%);background:none;border:0;color:var(--soft);font-weight:700}.btn{border:1px solid transparent;border-radius:12px;padding:12px 16px;font-weight:800}.btn-primary{background:linear-gradient(135deg,var(--orange),var(--orange2));color:#111}.btn-secondary{background:#18181d;border-color:var(--line);color:var(--text)}.btn-danger{background:rgba(255,93,93,.1);border-color:rgba(255,93,93,.35);color:#ff8b8b}.btn-full{width:100%}.login-card .btn{margin-top:22px}.error-text{color:#ff8b8b;margin:12px 0 0}.admin-shell{min-height:100vh;display:grid;grid-template-columns:250px 1fr}.sidebar{position:sticky;top:0;height:100vh;border-right:1px solid #202027;background:#0d0d10;padding:22px;display:flex;flex-direction:column}.sidebar-brand{display:flex;align-items:center;gap:10px;margin-bottom:28px}.sidebar .brand-name{font-size:17px}.nav-btn{width:100%;text-align:left;border:0;background:transparent;color:var(--muted);padding:12px 14px;border-radius:10px;font-weight:700}.nav-btn.active{background:#1d1511;color:#fff;border-left:3px solid var(--orange)}.sidebar-bottom{margin-top:auto}.admin-email{font-size:12px;color:var(--muted);word-break:break-all;margin-bottom:12px}.main{padding:38px;max-width:1400px;width:100%;margin:auto}.topbar{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:30px}.topbar h1{font-size:36px}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:36px}.stat{padding:20px}.stat span{display:block;color:var(--muted);font-size:13px}.stat strong{display:block;font-size:30px;margin-top:7px}.section-head{display:flex;justify-content:space-between;align-items:end;margin:0 0 16px}.section-head h2{margin:0;font-size:24px}.courses-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.course-card{display:grid;grid-template-columns:150px 1fr;overflow:hidden;min-height:190px}.course-cover{background:#111;min-height:190px}.course-cover img{width:100%;height:100%;display:block;object-fit:cover}.course-cover.placeholder{display:grid;place-items:center;color:#6b6b74;font-weight:800}.course-body{padding:20px;display:flex;flex-direction:column}.course-top{display:flex;justify-content:space-between;gap:10px}.badge{font-size:11px;font-weight:800;border-radius:999px;padding:6px 9px;background:#2a1a11;color:var(--orange2);border:1px solid #6a3515;white-space:nowrap}.badge.draft{background:#1c1c22;border-color:#34343d;color:#b3b3bd}.course-body h3{margin:12px 0 7px;font-size:19px}.course-body p{margin:0;color:var(--muted);font-size:13px;line-height:1.45}.course-meta{display:flex;gap:12px;flex-wrap:wrap;margin-top:12px;color:#c7c7ce;font-size:12px}.course-actions{display:flex;gap:8px;margin-top:auto;padding-top:16px}.course-actions .btn{padding:9px 11px;font-size:12px}.empty{padding:34px;text-align:center;color:var(--muted)}.empty h3{color:#fff;margin-top:0}.dialog{border:0;padding:0;background:transparent;color:var(--text);width:min(680px,calc(100vw - 28px));max-height:90vh}.dialog::backdrop{background:rgba(0,0,0,.72);backdrop-filter:blur(5px)}.dialog-wide{width:min(960px,calc(100vw - 28px))}.dialog-card{background:#141418;border:1px solid var(--line);border-radius:20px;padding:24px;max-height:88vh;overflow:auto}.dialog-head{display:flex;justify-content:space-between;gap:16px;align-items:flex-start}.dialog-head h2{font-size:25px}.icon-btn{border:1px solid var(--line);background:#1c1c21;color:#fff;width:38px;height:38px;border-radius:10px;font-size:22px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}.span-2{grid-column:span 2}.field label{margin-top:15px}.switch-row{display:flex;gap:10px;align-items:center;background:#101013;border:1px solid var(--line);padding:14px;border-radius:12px;margin-top:18px}.switch-row input{width:auto}.dialog-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:22px}.lessons-toolbar{display:flex;align-items:center;justify-content:space-between;gap:14px;margin:18px 0}.lessons-list{display:flex;flex-direction:column;gap:10px}.lesson-row{display:grid;grid-template-columns:50px 1fr auto;gap:14px;align-items:center;padding:14px;border:1px solid var(--line);border-radius:14px;background:#101013}.lesson-pos{width:42px;height:42px;border-radius:12px;background:#20150f;color:var(--orange2);display:grid;place-items:center;font-weight:900}.lesson-title{font-weight:800}.lesson-sub{font-size:12px;color:var(--muted);margin-top:4px}.lesson-actions{display:flex;gap:8px}.lesson-actions .btn{font-size:12px;padding:8px 10px}.toast{position:fixed;right:20px;top:20px;z-index:1000;max-width:360px;background:#1a1a20;border:1px solid var(--line);color:#fff;padding:13px 16px;border-radius:12px;box-shadow:0 16px 50px rgba(0,0,0,.4);opacity:0;pointer-events:none;transform:translateY(-8px);transition:.2s}.toast.show{opacity:1;transform:none}.toast.success{border-color:rgba(61,220,132,.45)}.toast.error{border-color:rgba(255,93,93,.5)}.loading{opacity:.55;pointer-events:none}

@media(max-width:900px){.login-shell{grid-template-columns:1fr;max-width:520px;gap:30px}.login-brand{justify-content:center}.admin-shell{display:block}.sidebar{position:static;height:auto;border-right:0;border-bottom:1px solid var(--line);padding:14px 18px;flex-direction:row;align-items:center;gap:14px}.sidebar-brand{margin:0}.sidebar nav{display:none}.sidebar-bottom{margin:0 0 0 auto;display:flex;align-items:center;gap:10px}.admin-email{display:none;margin:0}.sidebar-bottom .btn{width:auto}.main{padding:24px 18px}.courses-grid{grid-template-columns:1fr}.topbar h1{font-size:30px}}
@media(max-width:620px){.login-shell{padding:24px 16px}.login-brand{justify-content:flex-start}.brand-name{font-size:23px}.login-card{padding:24px}.topbar{align-items:flex-end}.topbar h1{font-size:27px}.topbar .btn{padding:10px 12px;font-size:12px}.stats-grid{grid-template-columns:1fr 1fr}.stats-grid .stat:last-child{grid-column:span 2}.course-card{grid-template-columns:1fr}.course-cover{height:180px;min-height:180px}.course-body{padding:18px}.form-grid{grid-template-columns:1fr}.span-2{grid-column:span 1}.lesson-row{grid-template-columns:44px 1fr}.lesson-actions{grid-column:2;justify-content:flex-start}.lessons-toolbar{align-items:flex-start;flex-direction:column}.dialog-actions .btn{flex:1}.sidebar .brand-name{display:none}}

.link-btn{display:block;width:100%;border:0;background:transparent;color:#d7d7dc;font-weight:750;padding:12px 8px 2px;text-align:center}
.link-btn:hover{color:var(--orange2)}
.dialog-copy{color:var(--muted);line-height:1.55;margin:12px 0 6px}

.field-help{margin:7px 0 0;color:var(--muted);font-size:12px;line-height:1.4}
.cover-upload-preview{margin-top:12px;display:flex;align-items:center;gap:12px;padding:12px;border:1px solid var(--line);border-radius:14px;background:#101013}
.cover-upload-preview[hidden]{display:none!important}
.cover-upload-preview img{width:96px;height:120px;object-fit:cover;border-radius:10px;border:1px solid var(--line);background:#0e0e11}
.btn-small{padding:9px 11px;font-size:12px}
input[type="file"]{padding:10px}

.material-upload-preview{margin-top:12px;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:12px 14px;border:1px solid var(--line);border-radius:14px;background:#101013}
.material-upload-preview[hidden]{display:none!important}
.material-upload-preview>div{min-width:0;display:grid;gap:3px}
.material-upload-preview strong{color:var(--text);font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.material-upload-preview span{color:var(--muted);font-size:12px}