:root{
  --kz-bg:#f4f7fc;
  --kz-surface:#ffffff;
  --kz-surface-2:#f8fbff;
  --kz-border:rgba(20,39,77,.10);
  --kz-border-strong:rgba(20,39,77,.18);
  --kz-text:#10203f;
  --kz-muted:#60708f;
  --kz-primary:#2f6df6;
  --kz-primary-2:#58c4ff;
  --kz-primary-soft:#edf4ff;
  --kz-success:#19a96b;
  --kz-warning:#d88c13;
  --kz-danger:#dc4f64;
  --kz-shadow:0 20px 60px rgba(16,32,63,.08);
  --kz-shadow-soft:0 12px 30px rgba(16,32,63,.06);
  --kz-radius-xl:28px;
  --kz-radius-lg:22px;
  --kz-radius-md:16px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:'Inter',system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  color:var(--kz-text);
  background:
    radial-gradient(circle at top left, rgba(88,196,255,.10), transparent 24%),
    radial-gradient(circle at top right, rgba(47,109,246,.07), transparent 30%),
    linear-gradient(180deg, #f8fbff 0%, var(--kz-bg) 100%);
}

a{color:var(--kz-primary); text-decoration:none}
a:hover{color:#2455c3}

.shell{min-height:calc(100vh - 144px)}
.page-wrap{display:flex; flex-direction:column; gap:1.5rem}
.display-mode-full .page-wrap{max-width:none}

.kz-navbar{
  background:rgba(255,255,255,.88);
  backdrop-filter:blur(18px);
  border-bottom:1px solid rgba(255,255,255,.75);
  box-shadow:0 8px 28px rgba(16,32,63,.04);
}
.kz-brand{
  display:flex; align-items:center; gap:.9rem; color:var(--kz-text);
}
.kz-brand:hover{color:var(--kz-text)}
.kz-brand-logo{
  width:clamp(120px, 16vw, 230px);
  height:auto;
  display:block;
}
.kz-brand-copy{display:none; flex-direction:column; line-height:1}
.kz-brand-copy strong{font-size:1.15rem; font-weight:800}
.kz-brand-copy span{font-size:.84rem; color:var(--kz-muted); font-weight:700; letter-spacing:.06em; text-transform:uppercase}
.kz-top-actions .btn{white-space:nowrap}
.btn-kz-soft{
  background:rgba(255,255,255,.9);
  border:1px solid var(--kz-border);
  color:var(--kz-text);
}
.btn-kz-soft:hover{background:var(--kz-primary-soft); border-color:rgba(47,109,246,.2); color:var(--kz-primary)}
.top-nav-link{
  font-weight:700;
  color:var(--kz-muted);
  padding:.8rem 1rem !important;
  border-radius:999px;
}
.top-nav-link:hover,.top-nav-link.active{
  background:var(--kz-primary-soft);
  color:var(--kz-primary);
}
.kz-chip{
  display:inline-flex; align-items:center; gap:.45rem;
  background:#fff; border:1px solid var(--kz-border);
  color:var(--kz-text);
  padding:.55rem .9rem; border-radius:999px; font-size:.92rem; font-weight:700;
}
.kz-footer{
  border-top:1px solid rgba(20,39,77,.08);
  color:var(--kz-muted);
  background:rgba(255,255,255,.85);
  padding:1rem 0;
}
.kz-footer-logo{width:120px;height:auto;opacity:.95}

.btn{
  border-radius:14px;
  font-weight:700;
  padding:.8rem 1.1rem;
  transition:.2s ease;
  box-shadow:none!important;
}
.btn-sm{border-radius:12px;padding:.56rem .85rem}
.btn-lg{padding:.96rem 1.25rem; font-size:1rem}
.btn-primary{
  background:linear-gradient(135deg,var(--kz-primary),#4586ff);
  border-color:transparent;
}
.btn-primary:hover{transform:translateY(-1px); filter:brightness(.98)}
.btn-outline-primary{
  border-color:rgba(47,109,246,.18);
  color:var(--kz-primary);
  background:#fff;
}
.btn-outline-primary:hover{
  background:var(--kz-primary-soft);
  border-color:rgba(47,109,246,.28);
  color:var(--kz-primary);
}
.btn-outline-dark{
  border-color:rgba(16,32,63,.14);
  color:var(--kz-text);
  background:#fff;
}
.btn-outline-dark:hover{background:#f7faff;color:var(--kz-text)}
.btn-light{background:#fff;border:1px solid rgba(255,255,255,.2)}

.hero-card,.surface-card,.table-shell,.auth-hero-card,.auth-form-card,.sidebar-panel,.glass-card,.module-card,.module-progress-panel,.topic-tile,.metric-card,.list-card,.notice-card,.lesson-progress-card{
  background:rgba(255,255,255,.90);
  border:1px solid var(--kz-border);
  border-radius:var(--kz-radius-xl);
  box-shadow:var(--kz-shadow);
}

.hero-card,.surface-card,.table-shell,.glass-card,.notice-card,.lesson-progress-card{
  padding:clamp(1.2rem,1.6vw,1.8rem);
}
.hero-card{
  background:
    radial-gradient(circle at top right, rgba(88,196,255,.12), transparent 25%),
    radial-gradient(circle at bottom left, rgba(47,109,246,.10), transparent 24%),
    rgba(255,255,255,.92);
}
.course-hero-gradient{
  background:
    linear-gradient(135deg, rgba(47,109,246,.05), rgba(88,196,255,.05)),
    rgba(255,255,255,.94);
}
.page-header{
  display:flex; justify-content:space-between; align-items:flex-start; gap:1rem; margin-bottom:1rem;
}
.page-title{
  font-size:clamp(2rem,4vw,3.5rem);
  line-height:.98;
  letter-spacing:-.05em;
  margin:0 0 .8rem;
  font-weight:900;
  color:#0f1a35;
}
.page-subtitle{
  font-size:1.02rem;
  line-height:1.7;
  color:var(--kz-muted);
  max-width:64ch;
}
.kicker,.tiny-label,.auth-eyebrow,.auth-form-eyebrow,.sidebar-caption{
  display:inline-block;
  text-transform:uppercase;
  letter-spacing:.12em;
  font-size:.78rem;
  font-weight:800;
  color:var(--kz-primary);
}
.tiny-label{color:#6b7a96}

.section-stack{display:flex; flex-direction:column; gap:1.2rem}
.hover-lift{transition:transform .2s ease, box-shadow .2s ease}
.hover-lift:hover{transform:translateY(-3px); box-shadow:0 24px 56px rgba(16,32,63,.10)}

.metric-card{
  padding:1.2rem;
  min-height:100%;
}
.metric-value{
  font-size:clamp(2rem,4vw,3rem);
  font-weight:900;
  line-height:1;
  letter-spacing:-.05em;
  margin:.55rem 0;
}
.metric-hint,.muted{color:var(--kz-muted)}
.badge-soft,.badge-soft-dark,.status-badge{
  display:inline-flex; align-items:center; gap:.4rem;
  border-radius:999px; padding:.45rem .75rem; font-weight:700; font-size:.82rem;
}
.badge-soft{background:var(--kz-primary-soft); color:var(--kz-primary)}
.badge-soft-dark{background:#eff3fb; color:#33456f}
.status-badge{background:#f5f7fb; color:#435476}
.status-success{background:rgba(25,169,107,.12); color:var(--kz-success)}
.status-warning{background:rgba(216,140,19,.12); color:var(--kz-warning)}
.status-neutral{background:rgba(47,109,246,.12); color:var(--kz-primary)}

.course-card{
  border:none;
  border-radius:var(--kz-radius-xl);
  overflow:hidden;
  box-shadow:var(--kz-shadow);
}
.course-thumb{
  aspect-ratio:16/10;
  object-fit:cover;
}
.course-title-lg{
  font-size:1.45rem;
  line-height:1.15;
  letter-spacing:-.03em;
  font-weight:800;
}
.course-sidebar-card{
  position:sticky; top:112px;
}
.module-card,.module-progress-panel,.topic-tile{
  padding:1.1rem 1.15rem;
}
.module-progress-panel{
  background:linear-gradient(180deg, rgba(255,255,255,.96), rgba(247,250,255,.96));
}
.topic-tile.is-locked{
  opacity:.78;
  background:linear-gradient(180deg, rgba(250,252,255,.96), rgba(245,247,251,.96));
}
.topic-tile.is-complete{
  border-color:rgba(25,169,107,.18);
  background:linear-gradient(180deg, rgba(241,252,248,.96), rgba(255,255,255,.96));
}
.progress{
  height:12px; border-radius:999px; background:#ecf1fb; overflow:hidden;
}
.progress-lg{height:14px}
.progress-bar{
  border-radius:inherit;
  background:linear-gradient(90deg,var(--kz-primary), var(--kz-primary-2));
}
.rich-content,.rich-content p,.rich-content li{
  color:#2f3f60;
  line-height:1.75;
}
.rich-content img{
  max-width:100%;
  height:auto;
  border-radius:20px;
  margin:1rem 0;
}
.empty-state{
  text-align:center; color:var(--kz-muted);
  padding:2.2rem 1.2rem;
}
.empty-state i{
  display:inline-flex; align-items:center; justify-content:center;
  width:64px; height:64px; border-radius:50%;
  background:var(--kz-primary-soft); color:var(--kz-primary); font-size:1.7rem; margin-bottom:.8rem;
}

.admin-shell{
  display:grid;
  grid-template-columns:minmax(270px,320px) minmax(0,1fr);
  gap:1.5rem;
  align-items:start;
}
.sidebar-panel{
  position:sticky;
  top:108px;
  padding:1.4rem;
  color:#fff;
  background:
    radial-gradient(circle at top right, rgba(88,196,255,.30), transparent 30%),
    linear-gradient(180deg, #183972 0%, #0f2147 100%);
}
.sidebar-head{display:flex; flex-direction:column; gap:1rem; margin-bottom:1.2rem}
.sidebar-logo-wrap{
  display:inline-flex; align-items:center; justify-content:flex-start;
  padding:.85rem 1rem;
  border-radius:20px;
  background:rgba(255,255,255,.10);
  border:1px solid rgba(255,255,255,.14);
}
.sidebar-logo{width:142px; height:auto}
.sidebar-language-pill{
  display:flex; justify-content:space-between; align-items:center;
  background:rgba(255,255,255,.09); border:1px solid rgba(255,255,255,.12);
  border-radius:18px; padding:.8rem .95rem; margin-bottom:1rem;
  font-size:.92rem;
}
.sidebar-panel .nav-link{
  display:flex; align-items:center; gap:.8rem;
  color:rgba(255,255,255,.78); padding:.9rem 1rem;
  border-radius:16px; font-weight:700;
}
.sidebar-panel .nav-link:hover,.sidebar-panel .nav-link.active{
  color:#fff; background:rgba(255,255,255,.12);
}
.sidebar-panel .nav-link i{font-size:1.05rem}
.sidebar-footer{padding-top:1rem; border-top:1px solid rgba(255,255,255,.12)}

.table-shell{
  padding:0;
  overflow:hidden;
}
.table-toolbar{
  padding:1.2rem 1.2rem 0;
  display:flex; justify-content:space-between; align-items:flex-end; gap:1rem; flex-wrap:wrap;
}
.table-toolbar-actions{
  display:flex; gap:.75rem; flex-wrap:wrap;
}
.search-input-wrap{
  position:relative; min-width:min(100%, 320px);
}
.search-input-wrap i{
  position:absolute; left:14px; top:50%; transform:translateY(-50%);
  color:#8090ad;
}
.search-input-wrap .form-control{
  padding-left:2.6rem;
}
.table{
  margin-bottom:0;
}
.table thead th{
  background:#f7faff;
  color:#536381;
  font-size:.78rem;
  text-transform:uppercase;
  letter-spacing:.1em;
  font-weight:800;
  border-bottom:1px solid rgba(20,39,77,.08);
  padding:1rem 1.1rem;
}
.table tbody td{
  padding:1rem 1.1rem;
  border-color:rgba(20,39,77,.06);
}
.table tbody tr:hover{background:#fbfdff}

.form-control,.form-select,.form-check-input,textarea{
  border-radius:14px!important;
  border:1px solid rgba(20,39,77,.12)!important;
  min-height:48px;
  background:#fff!important;
}
textarea.form-control{min-height:140px}
.form-control:focus,.form-select:focus,.form-check-input:focus{
  border-color:rgba(47,109,246,.32)!important;
  box-shadow:0 0 0 .2rem rgba(47,109,246,.12)!important;
}
.form-label{
  margin-bottom:.45rem;
  font-size:.92rem;
  color:#44516e;
}
.form-switch .form-check-input{min-height:auto!important}

.list-card{
  padding:1rem 1.05rem;
  background:rgba(255,255,255,.85);
}
.notice-card{
  border-left:4px solid var(--kz-primary);
}
.glass-card{
  background:rgba(255,255,255,.72);
  backdrop-filter:blur(18px);
}

.auth-shell{max-width:1180px;margin-inline:auto}
.auth-hero-card,.auth-form-card{
  padding:clamp(1.5rem,2vw,2.4rem);
  backdrop-filter:blur(10px);
}
.auth-hero-card{
  background:
    radial-gradient(circle at top left, rgba(87,141,255,.10), transparent 34%),
    radial-gradient(circle at bottom right, rgba(87,141,255,.14), transparent 28%),
    rgba(255,255,255,.92);
}
.auth-logo-wrap{margin-bottom:1rem}
.auth-inline-logo{width:170px;height:auto}
.auth-hero-title{
  font-size:clamp(2.2rem,4vw,4rem);
  line-height:.96;
  letter-spacing:-.04em;
  font-weight:900;
  color:#0f172a;
  max-width:10ch;
  margin-bottom:1rem;
}
.auth-hero-copy{
  font-size:1.08rem;
  line-height:1.7;
  color:#5b6884;
  max-width:40rem;
  margin-bottom:1.6rem;
}
.auth-mini-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:1rem;
}
.auth-mini-card{
  min-height:132px;
  border-radius:1.4rem;
  background:rgba(255,255,255,.92);
  border:1px solid rgba(18,32,72,.08);
  box-shadow:0 12px 32px rgba(31,63,122,.06);
  padding:1rem .95rem;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  overflow:hidden;
}
.auth-mini-label{
  text-transform:uppercase;
  letter-spacing:.1em;
  font-size:.76rem;
  font-weight:800;
  color:#64748b;
}
.auth-mini-value{
  font-size:clamp(1.25rem,1.7vw,1.85rem);
  line-height:1.1;
  letter-spacing:-.04em;
  font-weight:900;
  color:#0f172a;
  word-break:break-word;
  overflow-wrap:anywhere;
}
.auth-form-title{
  font-size:clamp(2rem,3vw,3rem);
  line-height:1.02;
  letter-spacing:-.04em;
  font-weight:900;
  color:#0f172a;
  margin-bottom:1.25rem;
}
.auth-form-stack{
  display:grid;
  gap:1.15rem;
}
.auth-input{
  min-height:58px!important;
  border-radius:1.1rem!important;
  font-size:1rem;
}
.auth-submit-btn{min-height:54px;border-radius:1rem!important}
.auth-helper-row{
  display:flex; justify-content:center; gap:.5rem; flex-wrap:wrap;
  font-size:.95rem; color:var(--kz-muted);
}

.stats-grid,.analytics-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:1rem;
}
.metric-icon{
  width:44px;height:44px;border-radius:14px;
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--kz-primary-soft);color:var(--kz-primary);font-size:1.1rem;
}
.metric-label{font-size:.85rem;text-transform:uppercase;letter-spacing:.1em;color:#6b7a96;font-weight:800}

.lesson-progress-card,.flashcard-face{
  padding:1rem 1.1rem;
}
.flashcard-face{
  border-radius:20px;
  min-height:160px;
  display:flex;
  align-items:center;
  justify-content:center;
  text-align:center;
  background:linear-gradient(180deg,#fff,#f8fbff);
  border:1px solid var(--kz-border);
}

.soft-float{box-shadow:var(--kz-shadow-soft)}

@media (max-width: 1199.98px){
  .admin-shell{grid-template-columns:1fr}
  .sidebar-panel{position:relative;top:0}
  .course-sidebar-card{position:relative; top:0}
  .stats-grid,.analytics-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .auth-hero-title{max-width:100%}
}

@media (max-width: 991.98px){
  .page-title{font-size:clamp(1.9rem,8vw,2.8rem)}
  .kz-brand-logo{width:150px}
  .kz-top-actions{padding-top:.5rem}
}

@media (max-width: 767.98px){
  .page-wrap{gap:1rem}
  .hero-card,.surface-card,.table-shell,.auth-hero-card,.auth-form-card,.sidebar-panel,.glass-card,.module-card,.module-progress-panel,.topic-tile,.metric-card,.list-card,.notice-card,.lesson-progress-card{
    border-radius:22px;
  }
  .page-header{flex-direction:column; align-items:flex-start}
  .auth-mini-grid,.stats-grid,.analytics-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .auth-mini-card{min-height:108px;padding:.9rem}
  .auth-hero-copy{font-size:1rem;line-height:1.55}
  .auth-mini-value{font-size:1.15rem}
  .kz-footer{padding-bottom:1.4rem}
}

@media (max-width: 575.98px){
  .auth-mini-grid,.stats-grid,.analytics-grid{grid-template-columns:1fr 1fr}
  .table-toolbar{padding:1rem 1rem 0}
  .table thead th,.table tbody td{padding:.85rem}
  .kz-brand-logo{width:136px}
}