:root{--navy:#10234a;--navy-2:#183565;--blue:#3c78b7;--blue-light:#e7f2fb;--gold:#e8b92d;--gold-soft:#fff5cf;--ink:#172947;--muted:#6d7a8d;--paper:#f5f9fc;--white:#fff;--line:#e3eaf0;--green:#2f8054;--green-soft:#e8f4ed;--red:#a94b43;--red-soft:#fff0ed;--shadow:0 18px 54px rgba(16,35,74,.09);--radius:22px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--white);color:var(--ink);font-family:Tahoma,"Segoe UI",Arial,sans-serif;font-size:15px;line-height:1.75}button,input,textarea,select{font:inherit}button{cursor:pointer}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}[hidden]{display:none!important}.container{width:min(1160px,calc(100% - 44px));margin-inline:auto}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.site-header{height:82px;background:rgba(255,255,255,.96);border-bottom:1px solid #edf1f4;position:sticky;top:0;z-index:20;backdrop-filter:blur(15px)}.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:25px}.brand{display:inline-flex;align-items:center;gap:10px;min-width:max-content}.brand img{width:48px;height:48px;object-fit:contain}.brand strong{font-size:22px;color:var(--navy);display:block;line-height:1.2}.brand small{font-size:10px;color:var(--muted);display:block;margin-top:2px}.main-nav{display:flex;gap:25px;align-items:center}.main-nav a{font-size:13px;color:#53637a;font-weight:700;transition:color .2s}.main-nav a:hover{color:var(--blue)}.button{border:1px solid transparent;border-radius:13px;padding:12px 19px;display:inline-flex;align-items:center;justify-content:center;gap:9px;font-size:13px;font-weight:800;transition:transform .18s,background .18s,box-shadow .18s;white-space:nowrap}.button:hover:not(:disabled){transform:translateY(-1px)}.button:disabled{opacity:.55;cursor:not-allowed}.button-primary{background:var(--navy);color:#fff;box-shadow:0 8px 18px rgba(16,35,74,.16)}.button-primary:hover:not(:disabled){background:var(--blue)}.button-outline{background:#fff;color:var(--navy);border-color:#dce5ed}.button-outline:hover{border-color:#adc1d5;background:#f8fbfd}.button-dark{background:#15294d;color:#fff}.button-sm{padding:8px 12px;font-size:11px;border-radius:10px}.header-button{font-size:12px;padding:10px 15px}
.hero{display:grid;grid-template-columns:1.02fr .98fr;gap:44px;align-items:center;padding-top:61px;padding-bottom:52px;min-height:545px}.hero-copy{position:relative;z-index:1}.eyebrow{display:inline-flex;align-items:center;gap:9px;border-radius:30px;background:#f2f7fc;border:1px solid #e6eef6;padding:7px 13px;font-size:11px;font-weight:800;color:var(--blue)}.eyebrow-mark{color:var(--gold);font-size:15px}.hero h1{font-size:clamp(38px,5vw,59px);letter-spacing:-1.6px;line-height:1.3;margin:18px 0 12px;color:var(--navy)}.hero h1 span{color:var(--blue);position:relative}.hero-copy>p{max-width:540px;color:#67778c;font-size:15px;margin:0}.hero-actions{display:flex;align-items:center;gap:20px;margin-top:23px}.text-link{font-size:12px;font-weight:800;color:var(--navy);text-underline-offset:4px}.text-link:hover{text-decoration:underline}.hero-points{display:flex;flex-wrap:wrap;gap:15px 17px;margin-top:29px}.hero-points span{display:inline-flex;align-items:center;gap:7px;font-size:10px;color:#67778a}.hero-points i{font-style:normal;width:18px;height:18px;border-radius:50%;display:grid;place-items:center;background:var(--gold-soft);color:#967311;font-size:10px;font-weight:900}.hero-visual{position:relative;padding:17px 11px 25px 18px;min-width:0}.image-backdrop{position:absolute;background:#eaf4fb;border-radius:34px 34px 110px 34px;inset:0 0 3px 27px;transform:rotate(2.1deg)}.hero-image-frame{position:relative;overflow:hidden;border-radius:28px 28px 100px 28px;background:#eaf4fb;box-shadow:var(--shadow);border:5px solid #fff}.hero-image-frame img{width:100%;aspect-ratio:1440/491;object-fit:cover}.visual-stamp{position:absolute;bottom:0;left:0;background:#fff;border:1px solid var(--line);border-radius:16px;padding:10px 15px;box-shadow:0 12px 28px rgba(16,35,74,.12);display:flex;align-items:center;gap:10px}.stamp-star{width:34px;height:34px;border-radius:11px;background:var(--gold-soft);color:#ab8515;display:grid;place-items:center;font-size:18px}.visual-stamp b,.visual-stamp small{display:block}.visual-stamp b{font-size:11px;color:var(--navy)}.visual-stamp small{font-size:9px;color:var(--muted)}
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.toast{position:fixed;z-index:80;bottom:20px;left:20px;max-width:min(410px,calc(100% - 40px));background:#12284e;color:white;padding:12px 16px;border-radius:13px;box-shadow:0 12px 32px rgba(0,0,0,.18);font-size:12px;opacity:0;transform:translateY(8px);pointer-events:none;transition:opacity .2s,transform .2s}.toast.show{opacity:1;transform:translateY(0)}
.admin-login-page,.error-page{min-height:100vh;background:radial-gradient(ellipse at 20% 0%,#e8f3fb,transparent 46%),#f5f8fb;display:grid;place-items:center;padding:28px}.login-shell{width:min(470px,100%)}.login-brand{margin:0 auto 20px;display:flex;justify-content:center}.login-card{background:white;border:1px solid var(--line);border-radius:25px;padding:32px;box-shadow:var(--shadow)}.login-lock{width:48px;height:48px;border-radius:16px;background:var(--gold-soft);color:#987513;display:grid;place-items:center;font-size:24px;margin-bottom:15px}.login-card h1{font-size:25px;color:var(--navy);margin:4px 0}.login-card>p{font-size:12px;color:var(--muted);margin:0 0 20px}.login-form label,.password-form label,.code-create-form label,.create-subject-form>label,.subject-edit-form label,.lesson-upload-form>label,.file-field>label{display:block;font-size:11px;font-weight:800;color:#374962;margin:11px 0 6px}.login-form input,.password-form input,.code-create-form input,.code-create-form select,.create-subject-form input,.create-subject-form textarea,.subject-edit-form input,.subject-edit-form textarea,.lesson-upload-form input:not([type=file]),.lesson-upload-form select,.lesson-upload-form textarea{display:block;width:100%;border:1px solid #dfe6ed;border-radius:11px;background:#fff;padding:10px 12px;color:var(--ink);font-size:12px;outline:none}.login-form input:focus,.password-form input:focus,.code-create-form input:focus,.code-create-form select:focus,.create-subject-form input:focus,.create-subject-form textarea:focus,.subject-edit-form input:focus,.subject-edit-form textarea:focus,.lesson-upload-form input:focus,.lesson-upload-form select:focus,.lesson-upload-form textarea:focus{border-color:#8baecf;box-shadow:0 0 0 3px rgba(60,120,183,.09)}.login-submit{width:100%;margin-top:17px}.login-back{display:block;text-align:center;color:var(--blue);font-size:11px;font-weight:800;margin-top:18px}.login-foot{text-align:center;font-size:10px;color:#8592a1;margin:14px 0}.alert{padding:10px 12px;border-radius:11px;font-size:11px;margin:11px 0}.alert-error{background:var(--red-soft);color:var(--red);border:1px solid #f4d8d2}.alert-success{background:var(--green-soft);color:#32734b;border:1px solid #d8eddf}
.admin-page{background:#f6f8fb;min-height:100vh}.admin-topbar{height:75px;background:#fff;border-bottom:1px solid #e7edf2}.admin-top-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:18px}.admin-topbar .brand img{width:43px;height:43px}.admin-topbar .brand strong{font-size:19px}.admin-topbar .brand small{font-size:9px}.admin-top-actions{display:flex;align-items:center;gap:10px}.admin-top-actions form{margin:0}.secure-label{display:flex;align-items:center;gap:7px;color:#63806e;font-size:10px;font-weight:800}.secure-label i{display:block;width:7px;height:7px;border-radius:50%;background:#4aaa72;box-shadow:0 0 0 4px #e8f5ec}.admin-main{padding-top:31px;padding-bottom:50px}.admin-welcome{position:relative;overflow:hidden;border-radius:21px;background:linear-gradient(115deg,#10234a,#183868);color:#fff;padding:26px 30px;display:flex;align-items:center;justify-content:space-between;min-height:139px}.admin-welcome .section-kicker{color:#f0d06c}.admin-welcome 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strong{display:block;color:var(--navy);font-size:22px;line-height:1.3}.admin-columns{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(340px,.92fr);align-items:start;gap:15px}.admin-side-column{display:grid;gap:15px}.admin-panel{background:#fff;border:1px solid var(--line);border-radius:19px;padding:19px;min-width:0}.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:15px}.panel-heading h2{font-size:17px;color:var(--navy);margin:1px 0 0}.count-pill{border-radius:30px;background:#f2f5f8;color:#718094;padding:5px 9px;font-size:9px;white-space:nowrap}.panel-symbol{font-size:21px;color:#b38b1a;background:#fff6da;border-radius:12px;width:37px;height:37px;display:grid;place-items:center}.create-subject-form{background:#f7fafe;border:1px solid #e8eff5;border-radius:14px;padding:13px}.create-subject-form>label{margin-top:0}.inline-form{display:flex;gap:7px}.inline-form input{flex:1;min-width:0}.inline-form .button{font-size:10px;padding:9px 10px}.create-subject-form textarea{resize:vertical;margin-top:8px;min-height:54px}.admin-subject-list{display:grid;gap:11px;margin-top:13px}.admin-subject-card{border:1px solid #e9eef3;border-radius:15px;padding:14px}.subject-card-head{display:flex;align-items:center;justify-content:space-between;gap:10px}.subject-card-head>div{display:flex;align-items:center;gap:10px;min-width:0}.subject-symbol{width:35px;height:35px;flex:none;background:#fff5d4;color:#a18119;border-radius:12px;display:grid;place-items:center}.subject-card-head h3{font-size:13px;color:var(--navy);margin:0}.subject-card-head p{font-size:9px;color:var(--muted);margin:2px 0 0}.subject-edit-form{display:grid;grid-template-columns:1fr 1fr;gap:0 8px;margin-top:10px;padding-top:10px;border-top:1px solid #f0f3f6}.subject-edit-form label{font-size:9px;margin:5px 0}.subject-edit-form input,.subject-edit-form textarea{font-size:10px;padding:8px 9px}.subject-edit-form 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small{font-size:8px;color:#8995a4}.lesson-admin-row form{margin:0}.icon-button{width:25px;height:25px;border:1px solid #edf0f4;border-radius:8px;background:#fff;color:#718094;font-size:17px;line-height:1}.icon-button.danger:hover{color:var(--red);border-color:#f1cbc4}.empty-inline{font-size:9px;color:#9ba5b2;margin:7px 0}.add-lesson-details{margin-top:8px;border-radius:11px;background:#f6f9fc;border:1px solid #e7edf3;padding:9px 11px}.add-lesson-details summary{cursor:pointer;font-size:10px;font-weight:800;color:var(--blue);list-style:none}.add-lesson-details summary::-webkit-details-marker{display:none}.lesson-upload-form{padding-top:10px}.lesson-upload-form>label{font-size:9px;margin:7px 0 4px}.lesson-upload-form input:not([type=file]),.lesson-upload-form select,.lesson-upload-form textarea{font-size:10px;padding:8px 9px}.lesson-upload-form textarea{resize:vertical}.file-field{margin:9px 0 11px}.file-field input{width:100%;font-size:9px;color:#60718a}.file-field small{font-size:8px;color:#8290a0;display:block;margin-top:5px;line-height:1.6}.delete-subject-form{display:flex;justify-content:flex-end;margin-top:10px;padding-top:9px;border-top:1px solid #f0f3f6}.delete-subject-form button,.text-danger{border:0;background:transparent;color:#aa554b;font-size:9px;font-weight:800;padding:3px}.text-danger:hover{text-decoration:underline}.empty-state{text-align:center;border:1px dashed #dbe5ed;border-radius:15px;padding:29px 15px;margin-top:14px;color:#8491a0}.empty-state span{display:grid;place-items:center;width:37px;height:37px;border-radius:12px;background:var(--gold-soft);color:#9a7b1b;margin:0 auto 8px;font-size:19px}.empty-state strong{display:block;color:var(--navy);font-size:12px}.empty-state p{font-size:10px;margin:3px 0 0}.code-create-form label{font-size:10px}.code-create-form select,.code-create-form input{font-size:11px;padding:9px 10px}.help-text{font-size:9px;color:#8390a1;margin:8px 0 11px}.full-button{width:100%;font-size:11px}.new-codes-panel{margin-top:13px;border:1px solid #deebdf;background:#f4faf5;border-radius:13px;padding:12px}.new-codes-heading strong,.new-codes-heading span{display:block}.new-codes-heading strong{font-size:11px;color:#36654a}.new-codes-heading span{font-size:9px;color:#768c7d}.new-codes-list{display:grid;grid-template-columns:repeat(2,1fr);gap:6px;margin:9px 0}.new-code-value{background:#fff;border:1px solid #e2e9e0;padding:6px 8px;border-radius:8px;font-family:ui-monospace,Consolas,monospace;direction:ltr;text-align:center;font-size:11px;font-weight:800;color:var(--navy);letter-spacing:1px}.new-codes-panel button{margin-top:2px}.codes-table-wrap{overflow-x:auto}.codes-table{width:100%;border-collapse:collapse;min-width:340px}.codes-table th{font-size:9px;text-align:right;color:#8390a0;font-weight:700;padding:8px 5px;border-bottom:1px solid #e9eef3}.codes-table td{font-size:9px;color:#57677d;padding:9px 5px;border-bottom:1px solid #f0f3f6;vertical-align:middle}.codes-table td code{font-family:ui-monospace,Consolas,monospace;color:var(--navy);font-size:10px;direction:ltr;display:inline-block}.codes-table td form{margin:0}.status-chip{display:inline-flex;border-radius:30px;padding:4px 7px;font-size:8px;white-space:nowrap}.status-chip.active{background:#e9f5ed;color:#3e8058}.status-chip.used{background:#eff1f8;color:#72738b}.status-chip.revoked{background:#fff0ed;color:#a94b43}.empty-table-row td{text-align:center;color:#9aa5b1;padding:20px}.password-form label{font-size:9px;margin-top:9px}.password-form input{font-size:10px;padding:9px}.password-form button{margin-top:13px}.admin-disclaimer{margin-top:17px;border-radius:13px;background:#fff9e8;border:1px solid #f0e4bd;color:#786737;padding:11px 14px;font-size:9px}.admin-disclaimer strong{color:#604c1d}.admin-footer{border-top:1px solid #e5ebf1;padding:18px 0;color:#8994a2;font-size:9px}.error-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:30px;width:min(430px,100%);box-shadow:var(--shadow);text-align:center}.error-card .brand{justify-content:center}.error-mark{width:45px;height:45px;border-radius:50%;display:grid;place-items:center;margin:20px auto 10px;background:#fff2df;color:#a47d14;font-weight:900;font-size:22px}.error-card h1{font-size:21px;color:var(--navy);margin:7px 0}.error-card p{font-size:12px;color:var(--muted);margin:0 0 17px}
@media(max-width:900px){.hero{grid-template-columns:1fr 1fr;gap:22px;padding-top:45px}.hero h1{font-size:42px}.hero-points{gap:9px}.main-nav{gap:14px}.admin-columns{grid-template-columns:1fr}.admin-side-column{grid-template-columns:1fr 1fr;align-items:start}.admin-side-column>.admin-panel:last-child{grid-column:1/-1}.admin-subject-card{padding:12px}}
@media(max-width:640px){.container{width:min(100% - 28px,520px)}.site-header{height:68px}.brand img{width:41px;height:41px}.brand strong{font-size:19px}.brand small{font-size:9px}.main-nav{display:none}.header-button{font-size:10px;padding:8px 10px}.hero{display:flex;flex-direction:column;align-items:stretch;gap:20px;padding-top:33px;padding-bottom:29px}.hero h1{font-size:37px;letter-spacing:-.8px}.hero-copy>p{font-size:13px}.hero-actions{margin-top:17px;gap:13px}.hero-points{gap:9px 12px;margin-top:20px}.hero-points span{font-size:9px}.hero-visual{padding:8px 3px 19px 9px;max-width:500px;margin-inline:auto;width:100%}.hero-image-frame{border-radius:20px 20px 72px 20px;border-width:4px}.image-backdrop{border-radius:25px 25px 75px 25px;inset:0 0 0 12px}.visual-stamp{bottom:0;left:-2px;padding:8px 10px}.stamp-star{width:29px;height:29px}.unlock-layout{grid-template-columns:1fr;gap:13px;padding-top:22px;padding-bottom:21px}.unlock-heading h2{font-size:21px}.unlock-heading p{font-size:10px}.code-form{padding:6px}.code-form input{font-size:11px;padding:0 9px}.code-form .button{min-width:125px;padding:10px 11px;font-size:10px}.form-message{grid-column:1;margin:0 4px -5px;min-height:15px}.section{padding-top:47px}.section-heading h2{font-size:23px}.section-heading p{font-size:10px}.heading-decoration{font-size:23px;letter-spacing:2px}.subject-grid{grid-template-columns:1fr;gap:10px}.subject-card{min-height:0;padding:14px}.subject-card p{min-height:0}.subject-card h3{margin-top:9px}.steps-grid{grid-template-columns:1fr;gap:9px}.step-card{min-height:0;padding:15px}.step-number{top:10px;left:13px}.step-card h3{margin-top:10px}.how-section{padding-top:37px;padding-bottom:34px}.promo-banner{margin-bottom:39px;border-radius:14px}.promo-banner>img{aspect-ratio:1.45;object-fit:cover;object-position:center}.promo-caption{position:relative;left:auto;bottom:auto;border-radius:0;box-shadow:none;display:flex;flex-wrap:wrap;gap:7px 11px;padding:10px 12px}.promo-caption strong{width:100%;order:-1}.promo-caption span,.promo-caption a{font-size:9px}.lesson-grid{grid-template-columns:1fr}.student-library{padding-top:10px}.notice-card{margin-bottom:30px}.footer-inner{padding-top:13px;padding-bottom:13px;align-items:flex-start;flex-direction:column;gap:5px}.footer-inner>span{font-size:9px}.admin-login-page,.error-page{padding:15px}.login-card{padding:24px 19px}.admin-topbar{height:auto;min-height:67px}.admin-top-inner{padding-top:8px;padding-bottom:8px}.admin-top-actions{gap:6px}.admin-top-actions .secure-label{display:none}.admin-top-actions .button{font-size:9px;padding:7px 8px}.admin-topbar .brand img{width:37px;height:37px}.admin-topbar .brand strong{font-size:16px}.admin-topbar .brand small{font-size:8px}.admin-welcome{padding:20px;min-height:118px}.admin-welcome h1{font-size:21px}.admin-welcome p{font-size:10px;max-width:75%}.admin-orbit{left:-20px}.stats-grid{gap:7px}.stat-card{padding:10px 8px;gap:7px}.stat-icon{width:30px;height:30px;font-size:13px}.stat-card small{font-size:8px}.stat-card strong{font-size:18px}.admin-panel{padding:14px}.panel-heading h2{font-size:15px}.admin-side-column{grid-template-columns:1fr}.admin-side-column>.admin-panel:last-child{grid-column:auto}.inline-form{align-items:stretch}.inline-form .button{padding:8px;font-size:9px}.subject-edit-form{grid-template-columns:1fr}.subject-edit-form textarea,.subject-edit-form button{grid-column:auto}.admin-columns{gap:11px}.codes-table{min-width:310px}.codes-table th,.codes-table td{font-size:8px}.admin-main{padding-top:20px}.admin-footer{padding:14px 0}.toast{left:14px;bottom:14px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}