:root{
  --primary-color:#4f46e5;
  --secondary-color:#6366f1;
  --background-color:#f3f4f6;
  --surface:#ffffff;
  --surface-soft:#f8fafc;
  --text-color:#0f172a;
  --muted-text:#64748b;
  --border-color:#e2e8f0;
  --success:#16a34a;
  --warning:#ca8a04;
  --danger:#b91c1c;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06);
  --shadow-md:0 8px 24px rgba(15,23,42,.08);
  --radius-sm:10px;
  --radius-md:14px;
  --radius-lg:18px;
}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,system-ui,sans-serif;background:linear-gradient(180deg,#f8fbff 0%,var(--background-color) 220px);color:var(--text-color)}
a{text-decoration:none;color:inherit}

.topbar{background:rgba(15,23,42,.94);backdrop-filter:blur(12px);position:sticky;top:0;z-index:50;border-bottom:1px solid rgba(148,163,184,.18)}
.app-shell{display:flex;justify-content:space-between;align-items:center;gap:1rem;min-height:72px}
.brand{color:#fff;font-weight:700;display:flex;align-items:center;gap:.55rem}
.brand:not(.has-logo)::before{content:"";width:12px;height:12px;border-radius:50%;background:linear-gradient(135deg,var(--secondary-color),var(--primary-color));box-shadow:0 0 0 4px rgba(99,102,241,.2)}
.brand-logo-img{width:34px;height:34px;object-fit:contain;border-radius:8px;background:#fff;padding:3px}
.nav-menu{display:flex;gap:.55rem;flex-wrap:wrap;align-items:center;justify-content:flex-end}
.topbar-link{display:inline-flex;align-items:center;justify-content:center;color:#dbe3f2;padding:.52rem .9rem;border-radius:999px;border:1px solid transparent;font-weight:500;transition:.2s}
.topbar-link:hover{background:rgba(99,102,241,.18);color:#fff}
.topbar-link.active{background:#fff;color:#1e1b4b;font-weight:600;box-shadow:var(--shadow-sm)}
.topbar-logout{border-radius:999px;padding:.52rem 1rem;margin-left:.3rem}

main.container{padding-top:1.6rem;padding-bottom:2rem}
.hero-card,.content-card,.kpi-card,.quick-action-card,.checklist-card,.module-card,.lesson-row,.video-card,.material-card{background:var(--surface);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}
.hero-card{padding:1.15rem 1.25rem;margin-bottom:1rem;background:linear-gradient(120deg,#fff 0%,#eef3ff 110%)}
.page-header{display:flex;justify-content:space-between;gap:1rem;align-items:flex-start;margin-bottom:1rem}
.page-header h1{margin:0 0 .3rem;font-size:1.65rem}
.page-header p,.hero-card p{margin:0;color:var(--muted-text)}
.content-card{padding:1.1rem 1.2rem;margin:1rem 0}

.kpi-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:.85rem}
.kpi-card{padding:1rem}
.kpi-card small{display:block;color:var(--muted-text);font-weight:600}
.kpi-card strong{display:block;font-size:2rem;line-height:1.1;margin:.2rem 0}
.kpi-card p{margin:0;color:#475569;font-size:.87rem}

.quick-actions-grid,.checklist-grid,.material-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:.8rem}
.quick-action-card,.checklist-card{padding:1rem;display:flex;flex-direction:column;align-items:flex-start;gap:.35rem;min-height:104px;transition:.2s}
.quick-action-card:hover,.checklist-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}
.quick-action-card .cta{font-size:.84rem;font-weight:700;color:#3730a3}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:.35rem;font-weight:600;border-radius:var(--radius-sm);padding:.58rem .9rem;border:1px solid transparent;transition:.2s}
.btn-primary{background:var(--button-background);border-color:var(--button-background);color:#fff}
.btn-secondary{background:#eef2ff;border-color:#d9e2ff;color:#3730a3}
.btn-outline{background:#fff;border-color:#cbd5e1;color:#1f2937}
.btn-danger{background:var(--danger);border-color:var(--danger);color:#fff}

.progress-bar{height:11px;background:#e2e8f0;border-radius:999px;overflow:hidden}
.progress-bar span{display:block;height:100%;background:linear-gradient(90deg,var(--primary-color),var(--secondary-color))}
.badge{padding:.24rem .6rem;border-radius:999px;font-size:.75rem;font-weight:700}
.badge-success{background:#dcfce7;color:#166534}.badge-muted{background:#e2e8f0;color:#334155}.badge-warning{background:#fef3c7;color:#854d0e}

.form-control{border-radius:10px;border-color:#cbd5e1}.form-control:focus{box-shadow:0 0 0 .2rem rgba(99,102,241,.15);border-color:#a5b4fc}
.form-grid,.stack-form{display:grid;gap:.75rem}
.form-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}

.student-hero{display:grid;grid-template-columns:auto 1fr;gap:1rem;align-items:center}
.profile-avatar{width:96px;height:96px;border-radius:50%;object-fit:cover;border:3px solid #e2e8f0}
.profile-avatar-lg{width:124px;height:124px}
.profile-avatar-fallback{display:flex;align-items:center;justify-content:center;background:#c7d2fe;color:#312e81;font-size:1.8rem;font-weight:700}
.course-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:.85rem}
.course-card h5{margin:0 0 .35rem}
.lesson-row{display:flex;justify-content:space-between;align-items:center;gap:.8rem;padding:.85rem .95rem;margin:.55rem 0}

.breadcrumb{margin-bottom:.8rem;color:#475569;font-size:.92rem}
.video-card{padding:1rem;margin-bottom:.9rem}
.page-actions{display:flex;gap:.6rem;flex-wrap:wrap;margin-top:.95rem}
.empty-state{border:1px dashed #cbd5e1;border-radius:var(--radius-md);padding:1.2rem;text-align:center;background:#f8fafc;color:#64748b}

.login-body{min-height:100vh;background:radial-gradient(circle at top left,#e0e7ff 0,#f8fafc 48%)}
.login-shell{max-width:980px;margin:auto;min-height:100vh;display:grid;grid-template-columns:1.1fr 1fr;gap:1rem;align-items:center;padding:1.2rem}
.login-brand-panel,.login-card{background:#fff;border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-md)}
.login-brand-panel{padding:2rem}
.login-card{padding:1.6rem}
.brand-chip{display:inline-block;background:#e0e7ff;color:#312e81;border-radius:999px;padding:.25rem .65rem;font-size:.8rem;font-weight:700;margin-bottom:.65rem}
.login-campus-logo{max-height:56px;max-width:220px;object-fit:contain;display:block;margin-bottom:.75rem}
.campus-logo-preview{padding:.8rem;border:1px dashed #cbd5e1;border-radius:12px;background:#f8fafc;display:inline-flex}
.campus-logo-preview img{max-height:70px;max-width:260px;object-fit:contain}

@media (max-width:1024px){.kpi-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.login-shell{grid-template-columns:1fr}}
@media (max-width:768px){.app-shell{flex-direction:column;align-items:flex-start;padding:.5rem 0}.nav-menu{width:100%;justify-content:flex-start}.page-header{flex-direction:column}.student-hero{grid-template-columns:1fr}}
@media (max-width:640px){.kpi-grid,.quick-actions-grid,.checklist-grid,.course-grid,.material-grid{grid-template-columns:1fr}.topbar-link,.topbar-logout{width:100%}}
.video-shell{background:var(--surface);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:1rem;margin-bottom:1rem;box-shadow:var(--shadow-sm)}
.video-frame{position:relative;width:100%;padding-top:56.25%;overflow:hidden;border-radius:12px;background:#0f172a}
.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video-empty-state{border:1px dashed #cbd5e1;border-radius:12px;padding:1.25rem;background:#f8fafc;color:#475569}
.course-form-card h2,.course-list-card h2{margin-top:0}
.admin-table-wrap{overflow-x:auto}
.admin-table th,.admin-table td{padding:.75rem .7rem;vertical-align:middle;white-space:nowrap}
.action-button-group{display:flex;flex-wrap:wrap;gap:.4rem;align-items:center}
.helper-text{display:block;color:#475569;font-size:.82rem;margin-top:.2rem}
.form-hint{display:block;color:#64748b;font-size:.78rem;margin-top:.2rem}
.course-list-card .empty-state{margin-top:.75rem}

.admin-container{max-width:1320px}
.admin-page{display:grid;gap:1rem}
.section-card{background:var(--surface);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:1.1rem 1.2rem;box-shadow:var(--shadow-sm)}
.section-header{display:flex;justify-content:space-between;align-items:flex-start;gap:.75rem;margin-bottom:.8rem}
.section-title{margin:0;font-size:1.2rem}.page-title{margin:0 0 .2rem;font-size:1.75rem}.page-subtitle{margin:0;color:var(--muted-text)}
.form-grid{grid-template-columns:repeat(12,minmax(0,1fr));gap:.9rem}.form-field{grid-column:span 6}.form-field.full-width,.form-actions{grid-column:1/-1}
.form-label{display:block;font-size:.83rem;font-weight:700;color:#334155;margin-bottom:.28rem}.form-hint{color:#64748b;font-size:.78rem;margin-top:.24rem}
.checkbox-label{display:inline-flex;gap:.45rem;align-items:center;font-weight:600;color:#0f172a}
.table-responsive{overflow-x:auto}.data-table{width:100%;border-collapse:separate;border-spacing:0}.data-table th{white-space:nowrap;font-size:.78rem;text-transform:uppercase;letter-spacing:.03em;color:#64748b;padding:.75rem .7rem;border-bottom:1px solid var(--border-color)}.data-table td{padding:.8rem .7rem;vertical-align:middle;border-bottom:1px solid #eef2f7}
.col-course{min-width:260px}.text-center{text-align:center}.text-right{text-align:right}.justify-end{justify-content:flex-end}
.action-group{display:flex;gap:.5rem;flex-wrap:wrap;align-items:center}.action-group form{margin:0}
.action-btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid #cbd5e1;background:#fff;color:#1e293b;padding:.35rem .64rem;border-radius:999px;font-size:.78rem;font-weight:600;text-decoration:none}
.action-btn-danger{border-color:#fecaca;background:#fef2f2;color:#b91c1c}.action-btn-success{border-color:#bbf7d0;background:#f0fdf4;color:#166534}
.badge-active{background:#dcfce7;color:#166534}.badge-inactive{background:#fee2e2;color:#b91c1c}.badge-warning{background:#fef3c7;color:#854d0e}.badge-muted{background:#e2e8f0;color:#334155}
.metric-pill{display:inline-flex;min-width:44px;justify-content:center;padding:.2rem .55rem;border-radius:999px;background:#eff6ff;color:#1d4ed8;font-weight:700}
.brand-preview{padding:1rem;border:1px solid #dbeafe;border-radius:12px;background:linear-gradient(130deg,var(--cp),var(--cs));color:#fff}.brand-preview button{background:var(--cb);border:0;color:#fff;padding:.45rem .8rem;border-radius:9px}
@media (max-width:900px){.form-field{grid-column:span 12}.page-actions{width:100%}}

.course-builder{display:grid;gap:1rem}
.course-module-card{padding:1.25rem;border-radius:var(--radius-lg);background:#fff;border:1px solid var(--border-color);display:grid;gap:1rem}
.module-header h3{margin:0 0 .3rem}
.module-header p{margin:0;color:var(--muted-text)}
.module-edit-form{padding:.9rem;border:1px solid #e2e8f0;border-radius:12px;background:#f8fafc}
.lesson-list{display:grid;gap:.75rem}
.lesson-admin-card{border:1px solid #e2e8f0;border-radius:12px;padding:1rem;background:#fff;display:grid;gap:.8rem}
.lesson-admin-main strong{font-size:1rem;display:block}
.lesson-admin-main p{margin:.25rem 0 0;color:var(--muted-text)}
.lesson-admin-meta{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}
.lesson-admin-actions{padding:.75rem;border:1px solid #e2e8f0;border-radius:10px;background:#f8fafc}
.lesson-create-panel{padding:1rem;border:1px dashed #cbd5e1;border-radius:12px;background:#f8fafc}
.lesson-create-panel h4{margin:0 0 .7rem}
.material-create-panel{padding:.75rem;border:1px solid #e2e8f0;border-radius:10px;background:#f8fafc}
.compact-form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.8rem}
.compact-form-grid .form-field{display:flex;flex-direction:column;gap:.35rem;min-width:0}
.form-field-full{grid-column:1/-1}
.compact-form-grid .form-control,.compact-form-grid .form-select,textarea.form-control{width:100%;max-width:100%}
.action-group{display:flex;flex-wrap:wrap;gap:.6rem}
.action-btn{height:auto;min-height:2.2rem;white-space:nowrap}

@media (max-width:900px){
  .compact-form-grid{grid-template-columns:1fr}
  .form-field-full{grid-column:auto}
}

.page-breadcrumb{margin-bottom:.75rem}
.back-link,.breadcrumb-link{display:inline-flex;align-items:center;gap:.35rem;padding:.35rem .65rem;border:1px solid #cbd5e1;border-radius:999px;background:#fff;color:#334155;font-weight:600;font-size:.85rem;transition:.2s}
.back-link:hover,.breadcrumb-link:hover{background:#eef2ff;border-color:#c7d2fe;color:#312e81}
.action-btn.danger{border-color:#fecaca;background:#fef2f2;color:#b91c1c}
.action-btn.danger:hover{background:#fee2e2}
.danger-zone{border-color:#fecaca;background:#fff7f7}
.danger-zone p{margin:0 0 .8rem;color:#7f1d1d}

.student-summary-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:.8rem;margin:1rem 0}
.learning-card{background:linear-gradient(135deg,#fff,#eef2ff);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:1rem 1.1rem;box-shadow:var(--shadow-sm);margin-bottom:1rem}
.course-card-premium{background:#fff;border:1px solid var(--border-color);border-radius:var(--radius-md);padding:1rem;display:grid;gap:.5rem;box-shadow:var(--shadow-sm)}
.course-progress{display:grid;grid-template-columns:1fr auto;gap:.6rem;align-items:center}
.module-learning-card{background:#fff;border:1px solid var(--border-color);border-radius:var(--radius-md);padding:1rem;margin-bottom:.9rem;display:grid;gap:.65rem}
.lesson-learning-row{display:flex;justify-content:space-between;gap:.7rem;align-items:center;padding:.7rem .8rem;border:1px solid #e2e8f0;border-radius:10px;background:#f8fafc;margin-top:.5rem}
.lesson-layout{display:grid;grid-template-columns:minmax(0,2fr) minmax(280px,1fr);gap:1rem;align-items:start}
.lesson-main,.lesson-sidebar{display:grid;gap:.9rem}
.status-badge{display:inline-flex;padding:.25rem .55rem;border-radius:999px;background:#e0e7ff;color:#312e81;font-weight:700;font-size:.75rem}
.next-lesson-card{background:#fff;border:1px solid var(--border-color);border-radius:var(--radius-md);padding:.9rem;box-shadow:var(--shadow-sm)}
.empty-learning-state{border:1px dashed #cbd5e1;border-radius:12px;padding:1rem;background:#f8fafc;color:#64748b;text-align:center}
.certificate-standalone-body{margin:0;min-height:100vh;background:radial-gradient(circle at top,#eef2ff 0,#f8fafc 52%,#eef2f7 100%)}
.certificate-standalone-page{max-width:1120px;margin:0 auto;display:grid;gap:1rem;padding:2rem 1rem}
.certificate-print-area{background:#fff;border:1px solid #dbe3ef;border-radius:18px;box-shadow:var(--shadow-md);padding:1rem;isolation:isolate}
.certificate-frame{border:2px solid #0f172a;border-radius:12px;min-height:680px;padding:2.5rem 2.2rem;text-align:center;display:flex;flex-direction:column;justify-content:flex-start}
.certificate-logo{max-height:74px;max-width:260px;object-fit:contain;margin:0 auto .9rem;display:block}
.certificate-campus-name{margin:0;color:#334155;font-size:1rem;letter-spacing:.08em;text-transform:uppercase;font-weight:700}
.certificate-title{font-size:2.25rem;margin:.55rem 0 1rem;color:#0f172a;letter-spacing:.02em}
.certificate-lead{color:#475569;margin:.4rem 0;font-size:1.02rem}
.certificate-student-name{font-size:2.5rem;margin:.5rem 0;color:#1e3a8a;line-height:1.2}
.certificate-course-name{font-size:1.55rem;margin:.5rem 0 1.1rem;color:#111827}
.certificate-divider{height:1px;background:linear-gradient(90deg,transparent,#94a3b8,transparent);margin:1rem auto 1.1rem;width:84%}
.certificate-meta-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.9rem;margin-top:.2rem}
.certificate-meta{display:flex;flex-direction:column;gap:.15rem;margin:0;color:#475569}
.certificate-meta span{font-size:.82rem;letter-spacing:.06em;text-transform:uppercase}
.certificate-meta strong{font-size:1rem;color:#0f172a}
.certificate-signature-block{margin-top:auto;padding-top:2.5rem}
.certificate-signature-line{height:1px;width:260px;max-width:100%;background:#334155;margin:0 auto .45rem}
.certificate-signature-block strong{display:block;color:#0f172a}
.certificate-signature-block small{color:#64748b}
.certificate-print-tip{margin:.65rem 0 0;color:#475569;font-size:.9rem;text-align:center;line-height:1.5}
.certificate-actions{display:flex;justify-content:center;align-items:center;gap:.6rem;flex-wrap:wrap;background:#ffffffc2;border:1px solid #dbe3ef;border-radius:14px;padding:.95rem 1rem}
@media (max-width:900px){.lesson-layout{grid-template-columns:1fr}.certificate-meta-grid{grid-template-columns:1fr}.certificate-frame{padding:1.5rem 1rem;min-height:unset}.certificate-student-name{font-size:2rem}.certificate-title{font-size:1.8rem}}
@media print{
  @page{size:A4 portrait;margin:10mm}
  html,body{background:#fff !important;margin:0 !important;padding:0 !important}
  .no-print,.certificate-actions,button,a.btn,.btn{display:none !important}
  .certificate-standalone-page{margin:0 !important;padding:0 !important;max-width:none !important;background:#fff !important}
  .certificate-print-area{width:100% !important;min-height:calc(297mm - 20mm) !important;box-shadow:none !important;margin:0 auto !important;page-break-inside:avoid !important;background:#fff !important;border:0 !important;border-radius:0 !important;padding:0 !important}
  .certificate-frame{min-height:calc(297mm - 20mm) !important;border:1.5px solid #1f2937 !important;border-radius:0 !important;padding:14mm 12mm !important;box-shadow:none !important}
}
.course-builder-steps{display:grid;gap:.8rem}
.builder-step{background:#f8fafc;border:1px solid #dbeafe;border-radius:12px;padding:.75rem;display:flex;gap:.55rem;align-items:center}
.builder-step-number{width:28px;height:28px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;background:#312e81;color:#fff;font-weight:700}
.module-clean-card{padding:1rem;border:1px solid var(--border-color);border-radius:14px;background:#fff;display:grid;gap:.8rem}
.lesson-clean-card{border:1px solid #e2e8f0;background:#fff;border-radius:12px;padding:.85rem;display:grid;gap:.6rem}
.lesson-type-badge{padding:.2rem .55rem;border-radius:999px;font-size:.75rem;font-weight:700}
.lesson-type-live{background:#fee2e2;color:#991b1b}
.lesson-type-recorded{background:#dcfce7;color:#166534}
.lesson-type-empty{background:#f1f5f9;color:#334155}
.live-class-card{border:1px solid #fecaca;background:#fff7f7;border-radius:12px;padding:1rem}
.live-class-button{margin-top:.45rem}
.details-panel{border:1px solid #e2e8f0;border-radius:10px;background:#f8fafc;padding:.25rem .55rem}
.details-summary{font-weight:700;cursor:pointer;color:#1e3a8a;padding:.35rem 0}
.class-form-section{padding:.3rem .2rem 0}
.class-form-subtitle{margin:0;color:#334155}