:root{
  --navy:#0b1f3a;
  --blue:#1d4ed8;
  --blue-dark:#1e40af;
  --blue-light:#eff6ff;
  --blue-mid:#dbeafe;
  --text:#0f172a;
  --muted:#5b6b82;
  --border:#e2e8f0;
  --card:#ffffff;
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:var(--text);background:#fff;line-height:1.5}
body.drawer-open{overflow:hidden !important}
a{text-decoration:none;color:inherit}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
img,svg{max-width:100%}

/* ---------- Nav ---------- */
.lp-nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}
.lp-nav .wrap{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;gap:16px}
.lp-brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:19px;color:var(--navy)}
.lp-brand .dot{width:10px;height:10px;border-radius:50%;background:var(--blue)}
.lp-nav-actions{display:flex;align-items:center;gap:10px}

.lp-desktop-only{display:flex;align-items:center;gap:10px}
.lp-mobile-only{display:none}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:11px 20px;border-radius:10px;font-size:14px;font-weight:700;cursor:pointer;border:1.5px solid transparent;white-space:nowrap;transition:all 0.15s ease}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark)}
.btn-outline{background:#fff;color:var(--blue);border-color:var(--blue)}
.btn-outline:hover{background:var(--blue-light)}
.btn-lg{padding:14px 28px;font-size:15.5px;border-radius:12px}
.btn-ghost-navy{background:transparent;color:var(--navy);border-color:transparent}
.btn-ghost-navy:hover{background:var(--blue-light)}

/* Hamburger Toggle Button */
.lp-menu-toggle{
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  width:38px;
  height:38px;
  padding:10px 8px;
  background:transparent;
  border:1px solid var(--border);
  border-radius:8px;
  cursor:pointer;
  transition:all 0.2s ease;
}
.lp-menu-toggle span{
  width:100%;
  height:2px;
  background-color:var(--text);
  border-radius:2px;
  transition:all 0.25s ease-in-out;
  transform-origin:center;
}
.lp-menu-toggle.open span:nth-child(1){
  transform:translateY(6px) rotate(45deg);
}
.lp-menu-toggle.open span:nth-child(2){
  opacity:0;
  transform:scaleX(0);
}
.lp-menu-toggle.open span:nth-child(3){
  transform:translateY(-6px) rotate(-45deg);
}

/* ---------- Mobile Menu Drawer & Overlay ---------- */
.lp-drawer-backdrop{
  position:fixed;
  inset:0;
  background:rgba(15, 23, 42, 0.5);
  backdrop-filter:blur(4px);
  z-index:99;
  opacity:0;
  pointer-events:none;
  transition:opacity 0.3s ease;
}
.lp-drawer-backdrop.active{
  opacity:1;
  pointer-events:auto;
}

.lp-drawer{
  position:fixed;
  top:0;
  right:0;
  bottom:0;
  width:320px;
  max-width:85vw;
  background:var(--card);
  z-index:100;
  transform:translateX(100%);
  transition:transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display:flex;
  flex-direction:column;
  box-shadow:-10px 0 30px rgba(0,0,0,0.15);
}
.lp-drawer.active{
  transform:translateX(0);
}

.lp-drawer-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:16px 20px;
  border-bottom:1px solid var(--border);
}
.lp-drawer-close{
  background:transparent;
  border:1px solid var(--border);
  border-radius:8px;
  width:34px;
  height:34px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:16px;
  color:var(--muted);
  cursor:pointer;
  transition:all 0.15s ease;
}
.lp-drawer-close:hover{
  background:var(--blue-light);
  color:var(--blue-dark);
}

.lp-drawer-body{
  flex:1;
  overflow-y:auto;
  padding:20px;
}
.lp-drawer-group{
  margin-bottom:10px;
}
.lp-drawer-label{
  font-size:11px;
  font-weight:800;
  text-transform:uppercase;
  letter-spacing:0.08em;
  color:var(--muted);
  margin-bottom:12px;
}
.lp-drawer-card{
  display:flex;
  align-items:center;
  gap:12px;
  padding:12px 14px;
  border-radius:12px;
  border:1px solid var(--border);
  background:var(--card);
  margin-bottom:10px;
  text-decoration:none;
  transition:all 0.2s ease;
}
.lp-drawer-card:hover, .lp-drawer-card:active{
  transform:translateY(-2px);
  border-color:var(--blue-mid);
  box-shadow:0 4px 12px rgba(29, 78, 216, 0.08);
}
.lp-drawer-teacher{
  background:var(--blue-light);
  border-color:var(--blue-mid);
}
.lp-drawer-student{
  background:var(--card);
}
.lp-drawer-icon{
  font-size:20px;
  width:40px;
  height:40px;
  border-radius:10px;
  background:rgba(29, 78, 216, 0.1);
  display:flex;
  align-items:center;
  justify-content:center;
  flex-shrink:0;
}
.lp-drawer-info{
  flex:1;
}
.lp-drawer-info .title{
  font-size:14px;
  font-weight:700;
  color:var(--navy);
}
.lp-drawer-info .desc{
  font-size:12px;
  color:var(--muted);
  margin-top:2px;
}
.lp-drawer-card .arrow{
  font-size:16px;
  font-weight:700;
  color:var(--blue);
}

.lp-drawer-divider{
  height:1px;
  background:var(--border);
  margin:18px 0;
}

.lp-drawer-setting-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-bottom:14px;
}
.setting-label{
  font-size:13px;
  font-weight:600;
  color:var(--text);
}
.theme-switch-btns{
  display:flex;
  gap:6px;
}
.theme-option-btn{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 12px;
  border-radius:8px;
  border:1px solid var(--border);
  background:transparent;
  font-size:12px;
  font-weight:700;
  color:var(--muted);
  cursor:pointer;
  transition:all 0.15s ease;
}
.theme-option-btn.active{
  background:var(--blue-light);
  color:var(--blue-dark);
  border-color:var(--blue-mid);
}

.lp-drawer-footer{
  padding:16px 20px;
  border-top:1px solid var(--border);
  font-size:12px;
  color:var(--muted);
  text-align:center;
}

/* ---------- Hero ---------- */
.lp-hero{background:radial-gradient(1100px 480px at 85% -10%, #dbeafe 0%, rgba(219,234,254,0) 60%), linear-gradient(180deg,#fff 0%,#f8fafc 100%);padding:72px 0 56px;overflow:hidden}
.lp-hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.lp-eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--blue-light);color:var(--blue-dark);font-size:13px;font-weight:700;padding:6px 14px;border-radius:999px;border:1px solid var(--blue-mid)}
.lp-hero h1{font-size:42px;line-height:1.15;margin:18px 0 14px;color:var(--navy);font-weight:800;letter-spacing:-.5px}
.lp-hero h1 span{color:var(--blue)}
.lp-hero p.lead{font-size:17px;color:var(--muted);max-width:520px;margin:0 0 28px}
.lp-hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.lp-hero-note{margin-top:14px;font-size:13px;color:var(--muted)}

/* Mock leaderboard panel (decorative, illustrates the product) */
.lp-mock{background:var(--card);border:1px solid var(--border);border-radius:20px;box-shadow:0 20px 50px -20px rgba(15,42,86,.28);padding:22px;position:relative}
.lp-mock-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.lp-mock-head b{font-size:14px;color:var(--navy)}
.lp-mock-live{display:flex;align-items:center;gap:6px;font-size:12px;font-weight:700;color:#dc2626}
.lp-mock-live i{width:8px;height:8px;border-radius:50%;background:#dc2626;display:inline-block;animation:pulse 1.4s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}
.lp-mock-row{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px dashed var(--border)}
.lp-mock-row:last-child{border-bottom:none}
.lp-mock-rank{width:26px;height:26px;border-radius:8px;background:var(--blue-light);color:var(--blue-dark);font-weight:800;font-size:12px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.lp-mock-rank.gold{background:#fef3c7;color:#92400e}
.lp-mock-name{flex:1;font-size:13.5px;font-weight:600}
.lp-mock-bar{height:6px;border-radius:999px;background:var(--blue-light);flex:1;overflow:hidden;max-width:110px}
.lp-mock-bar i{display:block;height:100%;background:var(--blue);border-radius:999px}
.lp-mock-score{font-size:13px;font-weight:800;color:var(--navy);width:36px;text-align:right}
.lp-mock-badge{position:absolute;bottom:-14px;right:22px;background:var(--navy);color:#fff;font-size:12px;font-weight:700;padding:8px 14px;border-radius:10px;box-shadow:0 10px 20px -8px rgba(11,31,58,.5)}

/* ---------- Stats ---------- */
.lp-stats{background:var(--navy);padding:30px 0}
.lp-stats .wrap{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:20px;text-align:center}
.lp-stat b{display:block;font-size:30px;font-weight:800;color:#fff}
.lp-stat span{font-size:13px;color:#a9bcda}

/* ---------- Sections ---------- */
.lp-section{padding:72px 0}
.lp-section-head{text-align:center;max-width:640px;margin:0 auto 44px}
.lp-kicker{color:var(--blue);font-weight:700;font-size:13px;letter-spacing:.06em;text-transform:uppercase}
.lp-section-head h2{font-size:30px;color:var(--navy);margin:10px 0 10px;font-weight:800}
.lp-section-head p{color:var(--muted);font-size:15.5px}

.lp-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.lp-card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:26px}
.lp-card .ic{width:46px;height:46px;border-radius:12px;background:var(--blue-light);display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px}
.lp-card h3{font-size:16.5px;margin:0 0 8px;color:var(--navy)}
.lp-card p{font-size:14px;color:var(--muted);margin:0}

.lp-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;counter-reset:step}
.lp-step{position:relative;padding:28px 22px 22px;background:var(--blue-light);border-radius:16px;border:1px solid var(--blue-mid)}
.lp-step .num{width:34px;height:34px;border-radius:10px;background:var(--blue);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.lp-step h3{font-size:16px;margin:0 0 8px;color:var(--navy)}
.lp-step p{font-size:13.5px;color:var(--muted);margin:0}

.lp-audience{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.lp-aud-card{border-radius:20px;padding:34px;position:relative;overflow:hidden}
.lp-aud-teacher{background:linear-gradient(160deg,var(--navy) 0%,#173568 100%);color:#fff}
.lp-aud-student{background:var(--blue-light);border:1px solid var(--blue-mid);color:var(--navy)}
.lp-aud-card .tag{font-size:12px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;opacity:.75}
.lp-aud-card h3{font-size:22px;margin:10px 0 10px;font-weight:800}
.lp-aud-card p{font-size:14.5px;margin:0 0 22px;opacity:.9;max-width:380px}
.lp-aud-student p{color:var(--muted);opacity:1}
.lp-aud-list{list-style:none;padding:0;margin:0 0 24px;font-size:13.5px}
.lp-aud-list li{padding:5px 0;display:flex;gap:8px;align-items:flex-start}
.lp-aud-list li:before{content:"✓";font-weight:800;flex-shrink:0}
.lp-aud-teacher .lp-aud-list li:before{color:#60a5fa}
.lp-aud-student .lp-aud-list li:before{color:var(--blue)}

/* ---------- Footer ---------- */
.lp-cta{background:linear-gradient(135deg,var(--blue) 0%,var(--navy) 100%);padding:56px 0;text-align:center}
.lp-cta h2{color:#fff;font-size:27px;margin:0 0 10px;font-weight:800}
.lp-cta p{color:#cfe0fb;margin:0 0 26px;font-size:15px}
.lp-cta .btn-primary{background:#fff;color:var(--blue-dark)}
.lp-cta .btn-primary:hover{background:#eef2ff}
.lp-cta .btn-outline{background:transparent;border-color:#fff;color:#fff}
.lp-cta .btn-outline:hover{background:rgba(255,255,255,.12)}

.lp-footer{background:var(--navy);color:#9fb2d1;padding:34px 0;font-size:13px}
.lp-footer .wrap{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.lp-footer .lp-brand{color:#fff}

/* ---------- Responsive Breakpoints ---------- */
@media (max-width:768px){
  .lp-desktop-only{display:none !important}
  .lp-mobile-only{display:flex !important;align-items:center;gap:8px}
  .lp-nav .wrap{padding:12px 20px}
  .lp-hero{padding:48px 0 36px}
  .lp-hero .wrap{grid-template-columns:1fr;gap:32px}
  .lp-hero h1{font-size:30px;margin:14px 0 12px}
  .lp-hero p.lead{font-size:15.5px;margin-bottom:22px}
  .lp-hero-actions{flex-direction:column;gap:10px;width:100%}
  .lp-hero-actions .btn{width:100%;justify-content:center;min-height:48px}
  .lp-mock{padding:18px;border-radius:16px}
  .lp-stats{padding:24px 0}
  .lp-stats .wrap{grid-template-columns:repeat(2,1fr);gap:12px}
  .lp-stat{padding:12px 8px;background:rgba(255,255,255,0.06);border-radius:12px}
  .lp-stat b{font-size:24px}
  .lp-stat span{font-size:12px}
  .lp-section{padding:48px 0}
  .lp-section-head{margin-bottom:32px}
  .lp-section-head h2{font-size:24px}
  .lp-grid{grid-template-columns:1fr;gap:16px}
  .lp-steps{grid-template-columns:1fr;gap:16px}
  .lp-audience{grid-template-columns:1fr;gap:16px}
  .lp-aud-card{padding:26px 20px;border-radius:16px}
  .lp-aud-card .btn{width:100%;min-height:46px;justify-content:center}
  .lp-cta{padding:44px 16px}
  .lp-cta h2{font-size:23px}
  .lp-footer .wrap{flex-direction:column;text-align:center;justify-content:center;gap:10px}
}

@media (max-width:480px){
  .wrap{padding:0 16px}
  .lp-hero h1{font-size:25px}
  .lp-hero p.lead{font-size:14.5px}
  .lp-mock-badge{display:none}
  .lp-mock-name{font-size:12.5px}
  .lp-mock-bar{max-width:70px}
}

/* ---------- Language / theme switcher ---------- */
.lp-pref{display:flex;align-items:center;gap:4px}
.lp-pref button{background:transparent;border:1px solid var(--border);border-radius:8px;padding:6px 9px;font-size:12px;font-weight:700;color:var(--muted);cursor:pointer;transition:all 0.15s ease}
.lp-pref button.active{background:var(--blue-light);color:var(--blue-dark);border-color:var(--blue-mid)}
.lp-theme-btn{background:transparent;border:1px solid var(--border);border-radius:8px;padding:6px 10px;font-size:14px;cursor:pointer;line-height:1;transition:all 0.15s ease}

/* ---------- Dark theme ---------- */
:root[data-theme="dark"]{
  --navy:#0b1f3a;
  --blue:#60a5fa;
  --blue-dark:#93c5fd;
  --blue-light:#16233d;
  --blue-mid:#1e3358;
  --text:#e5e7eb;
  --muted:#9aa8c0;
  --border:#26324a;
  --card:#141d30;
}
:root[data-theme="dark"] body{background:#0b1220}
:root[data-theme="dark"] .lp-nav{background:rgba(11,18,32,.92)}
:root[data-theme="dark"] .lp-brand{color:#fff}
:root[data-theme="dark"] .lp-drawer{background:#0f1a2e}
:root[data-theme="dark"] .lp-drawer-info .title{color:#fff}
:root[data-theme="dark"] .lp-drawer-card{background:#141d30;border-color:#26324a}
:root[data-theme="dark"] .lp-drawer-teacher{background:#16233d;border-color:#1e3358}
:root[data-theme="dark"] .theme-option-btn.active{background:#16233d;color:var(--blue);border-color:var(--blue-mid)}
:root[data-theme="dark"] .lp-hero{background:radial-gradient(1100px 480px at 85% -10%, #16233d 0%, rgba(22,35,61,0) 60%), linear-gradient(180deg,#0b1220 0%,#0f1a2e 100%)}
:root[data-theme="dark"] .lp-hero h1{color:#fff}
:root[data-theme="dark"] .btn-outline{background:transparent}
:root[data-theme="dark"] .btn-ghost-navy{color:#e5e7eb}
:root[data-theme="dark"] .lp-section[style*="f8fafc"]{background:#0f1a2e !important}
:root[data-theme="dark"] .lp-aud-student{color:#e5e7eb}
:root[data-theme="dark"] .lp-aud-list li:before{color:var(--blue)}