:root{
  --bg1:#243bff;
  --bg2:#1a2db8;
  --ink:#0f172a;
  --white:#ffffff;
  --muted:rgba(255,255,255,.82);
  --muted2:rgba(255,255,255,.68);
  --glass:rgba(255,255,255,.10);
  --glass2:rgba(0,0,0,.18);
  --border:rgba(255,255,255,.18);
  --border2:rgba(255,255,255,.28);
  --shadow: 0 18px 45px rgba(0,0,0,.25);
  --radius:18px;
  --radius2:14px;
  --max:1100px;
  --accent:#56ffb9;
  --accent2:#ffffff;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--white);
  background:
    radial-gradient(900px 450px at 20% 0%, rgba(86,255,185,.18), transparent 70%),
    radial-gradient(900px 450px at 80% 15%, rgba(255,255,255,.10), transparent 70%),
    linear-gradient(180deg, var(--bg1), var(--bg2));
  overflow-x:hidden;
}

body.theme--light{
  --bg1:#f7f9ff;
  --bg2:#eef2ff;
  --white:#0f172a;
  --muted:rgba(15,23,42,.75);
  --muted2:rgba(15,23,42,.60);
  --glass:rgba(15,23,42,.06);
  --glass2:rgba(255,255,255,.65);
  --border:rgba(15,23,42,.12);
  --border2:rgba(15,23,42,.16);
  --shadow: 0 18px 45px rgba(15,23,42,.12);
}

/* Layout */
.container{ max-width:var(--max); margin:0 auto; padding:0 20px; }
.page{ padding-top:72px; }

.badge{
  display:inline-flex;
  padding:4px 8px;
  border-radius:999px;
  border:1px solid var(--border2);
  font-weight:900;
  font-size:12px;
  letter-spacing:.3px;
}
.badge--mvp{
  background: rgba(255,255,255,.10);
}

/* Header (glass) */
.header{
  position:fixed;
  top:0; left:0;
  width:100%;
  z-index:1000;
  background: rgba(15, 23, 42, 0.28);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom:1px solid var(--border);
  transition: background .25s ease, box-shadow .25s ease;
}
body.theme--light .header{
  background: rgba(255,255,255,.55);
}

.header.scrolled{
  background: rgba(15, 23, 42, 0.42);
  box-shadow: 0 10px 30px rgba(0,0,0,.18);
}
body.theme--light .header.scrolled{
  background: rgba(255,255,255,.72);
  box-shadow: 0 10px 30px rgba(15,23,42,.12);
}

.header__inner{
  height:72px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  color:inherit;
  font-weight:900;
  letter-spacing:.2px;
}
.brand__mark{
  width:12px; height:12px;
  border-radius:50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 0 16px rgba(86,255,185,.35);
}
.brand__text{ font-size:18px; }

.header__actions{
  display:flex;
  align-items:center;
  gap:10px;
}

.icon-btn{
  border:1px solid var(--border);
  background: rgba(255,255,255,.08);
  color: inherit;
  padding:10px 12px;
  border-radius: 12px;
  cursor:pointer;
  font-weight:900;
}
.icon-btn:hover{ background: rgba(255,255,255,.12); }

/* Nav */
.nav{ display:flex; align-items:center; }
.nav__toggle{ display:none; }

.nav__list{
  list-style:none;
  display:flex;
  align-items:center;
  gap:14px;
  margin:0;
  padding:0;
  font-family: 'busorama';
}
.nav__link{
  text-decoration:none;
  color: rgba(255,255,255,.92);
  font-weight:900;
  padding:10px 10px;
  border-radius: 12px;
  transition: background .2s ease, opacity .2s ease;
  opacity:.92;
}
body.theme--light .nav__link{ color: rgba(15,23,42,.86); }

.nav__link:hover{ background: rgba(255,255,255,.10); opacity:1; }
.nav__link.active{ background: rgba(255,255,255,.14); opacity:1; }

.nav__link--cta{
  background: var(--white);
  color:#14206a !important;
  padding:10px 14px;
  border-radius: 12px;
}
body.theme--light .nav__link--cta{
  background: #243bff;
  color: #fff !important;
}

/* Hero */
.hero{ padding: 70px 0 30px; }
.hero__inner{
  display:grid;
  grid-template-columns: 1.1fr .9fr;
  gap:22px;
  align-items:center;
}
.pill{
  display:inline-flex;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid var(--border2);
  background: rgba(255,255,255,.08);
  font-size:12px;
  font-weight:900;
  letter-spacing:.35px;
  width:fit-content;
  margin-bottom:14px;
}
.pill--soft{
  background: rgba(255,255,255,.10);
  border-color: var(--border);
}

.hero__title{
  margin:0 0 12px;
  font-size: 52px;
  line-height:1.03;
  letter-spacing: -0.03em;
}
.hero__glow{
  background: linear-gradient(135deg, rgba(86,255,185,.95), rgba(255,255,255,.95));
  -webkit-background-clip: text;
  background-clip:text;
  color: transparent;
}
.hero__lead{
  margin:0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.6;
  max-width: 62ch;
}
.hero__cta{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  margin-top: 22px;
}
.hero__chips{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  margin-top: 18px;
}
.chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 10px;
  border-radius:999px;
  border:1px solid var(--border);
  background: rgba(255,255,255,.08);
  color: var(--muted);
  font-weight:800;
  font-size:13px;
}
.chip__dot{
  width:8px; height:8px;
  border-radius:50%;
  background: rgba(86,255,185,.9);
  box-shadow: 0 0 14px rgba(86,255,185,.35);
}

/* Cards / Glass */
.glass{
  background: var(--glass);
  border:1px solid var(--border);
  border-radius: var(--radius);
  padding:18px;
  box-shadow: var(--shadow);
}
.glass__head{
  display:flex;
  justify-content:space-between;
  gap:10px;
  align-items:flex-start;
}
.glass__title{ font-weight:900; font-size:16px; }
.glass__sub{ color: var(--muted); font-weight:700; font-size:13px; }
.glass__grid{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap:12px;
  margin-top: 12px;
}
.glass__foot{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  margin-top: 12px;
}

.mini{
  background: var(--glass2);
  border:1px solid var(--border);
  border-radius: var(--radius2);
  padding:12px;
}
.mini__title{ font-weight:900; font-size:13px; }
.mini__text{ margin-top:6px; color: var(--muted); font-weight:700; font-size:12px; line-height:1.45; }
.mini__big{ font-weight:900; font-size:24px; margin-top:6px; }
.mini__bar{
  height:10px;
  border-radius:999px;
  background: rgba(255,255,255,.10);
  overflow:hidden;
  margin-top:10px;
}
.mini__fill{
  height:100%;
  background: linear-gradient(135deg, rgba(86,255,185,.9), rgba(255,255,255,.85));
  width:0%;
  transition: width .35s ease;
}

/* Buttons */
.btn{
  border:none;
  cursor:pointer;
  font-weight:900;
  border-radius:999px;
  padding:12px 18px;
  font-size:14px;
  text-decoration:none;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  transition: transform .10s ease, filter .15s ease, background .2s ease;
  user-select:none;
}
.btn:active{ transform: scale(.98); }

.btn--primary{
  background: var(--white);
  color:#14206a;
}
body.theme--light .btn--primary{
  background:#243bff;
  color:#fff;
}
.btn--primary:hover{ filter:brightness(.95); }

.btn--ghost{
  background: rgba(255,255,255,.12);
  color: inherit;
  border:1px solid var(--border2);
}
body.theme--light .btn--ghost{
  background: rgba(15,23,42,.06);
}
.btn--ghost:hover{ background: rgba(255,255,255,.18); }

.btn--soft{
  background: rgba(255,255,255,.10);
  color: inherit;
  border:1px solid var(--border);
}
.btn--soft:hover{ background: rgba(255,255,255,.14); }

.btn--pulse{ position:relative; }
.btn--pulse::after{
  content:"";
  position:absolute;
  inset:-6px;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.35);
  opacity:0;
  transform: scale(.98);
  animation: pulse 2.2s infinite;
  pointer-events:none;
}
@keyframes pulse{
  0%{opacity:0; transform:scale(.98)}
  30%{opacity:.35}
  70%{opacity:0; transform:scale(1.10)}
  100%{opacity:0; transform:scale(1.10)}
}

/* Sections */
.section{ padding: 50px 0 70px; }
.section__head{ margin-bottom: 18px; }
.section__title{ margin:0 0 10px; font-size: 32px; letter-spacing:-0.02em; }
.section__lead{ margin:0; color: var(--muted); max-width: 80ch; line-height:1.6; }

.cards{
  display:grid;
  gap:14px;
}
.cards--3{ grid-template-columns: repeat(3, 1fr); }

.card{
  background: #ffffff;
  color: #0f172a;
  border-radius: var(--radius);
  padding:18px;
  box-shadow: var(--shadow);
  transition: transform .18s ease;
}
.card:hover{ transform: translateY(-4px); }
.card__title{ font-weight:900; margin:0 0 8px; }
.card__text{ color:#5b6b86; margin:0 0 14px; line-height:1.55; }
.card__meta{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  color:#5b6b86;
  font-weight:700;
  font-size:13px;
}
.card__tag{
  padding:6px 10px;
  border-radius:999px;
  border:1px solid rgba(15,23,42,.12);
  background: rgba(15,23,42,.04);
}

/* Practice layout */
.practice{
  display:grid;
  grid-template-columns: 1fr 1.05fr;
  gap:14px;
  align-items:start;
}
.practice__left, .practice__right{ display:grid; gap:14px; }

.panel{
  background: rgba(255,255,255,.10);
  border:1px solid var(--border);
  border-radius: var(--radius);
  padding:18px;
  box-shadow: var(--shadow);
}
.panel--soft{
  background: rgba(255,255,255,.08);
}
.panel--quiz{
  min-height: 360px;
}
.panel__head{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:10px;
  margin-bottom: 12px;
}
.panel__title{ font-weight:900; font-size:16px; }
.panel__sub{ color: var(--muted); font-weight:700; font-size:13px; margin-top:4px; }
.panel__actions{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  margin-top: 12px;
}
.hint{
  margin-top: 12px;
  color: var(--muted);
  font-weight:700;
  font-size:13px;
}

.form-grid{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap:12px;
}
.field{ display:flex; flex-direction:column; gap:6px; }
.field__label{ font-weight:900; font-size:12px; letter-spacing:.2px; color: var(--muted); }
.field__input{
  border:1px solid var(--border2);
  background: rgba(255,255,255,.10);
  color: inherit;
  padding:12px 12px;
  border-radius: 14px;
  outline:none;
}
body.theme--light .field__input{
  background: rgba(255,255,255,.70);
}
.field__input:focus{
  border-color: rgba(86,255,185,.60);
  box-shadow: 0 0 0 4px rgba(86,255,185,.12);
}

/* Quiz */
.quiz__q{
  font-weight:900;
  font-size:18px;
  margin: 6px 0 12px;
  line-height:1.4;
}
.quiz__choices{
  display:grid;
  gap:10px;
}
.choice{
  text-align:left;
  border:1px solid var(--border2);
  background: rgba(255,255,255,.10);
  color: inherit;
  padding:12px 12px;
  border-radius: 14px;
  cursor:pointer;
  font-weight:800;
  transition: transform .10s ease, background .2s ease, border-color .2s ease;
}
.choice:hover{ background: rgba(255,255,255,.14); }
.choice:active{ transform: scale(.99); }
.choice.correct{
  border-color: rgba(86,255,185,.70);
  background: rgba(86,255,185,.14);
}
.choice.wrong{
  border-color: rgba(255,120,120,.70);
  background: rgba(255,120,120,.14);
}
.quiz__feedback{
  margin-top: 12px;
  color: var(--muted);
  font-weight:700;
  min-height: 44px;
  line-height:1.5;
}
.quiz__actions{
  display:flex;
  justify-content:flex-end;
  gap:10px;
  margin-top: 10px;
}

/* Mistakes */
.mistakes{ display:grid; gap:10px; }
.mistake{
  border:1px solid var(--border2);
  background: rgba(255,255,255,.08);
  border-radius: 14px;
  padding:12px;
}
.mistake__q{ font-weight:900; margin-bottom:6px; }
.mistake__meta{ color: var(--muted); font-weight:700; font-size:12px; }

/* Stats */
.stats{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:12px;
  margin-top: 10px;
}
.stat{
  background: rgba(0,0,0,.16);
  border:1px solid var(--border);
  border-radius: 14px;
  padding:12px;
}
.stat__num{ font-size:22px; font-weight:900; }
.stat__label{ color: var(--muted); font-weight:800; font-size:12px; margin-top:6px; }

/* KPI & Slider */
.grid{ display:grid; gap:14px; }
.grid--3{ grid-template-columns: repeat(3, 1fr); }
.kpi{ text-align:center; padding: 14px 8px; }
.kpi__num{ font-size:42px; font-weight:900; letter-spacing:-0.03em; }
.kpi__label{ color: var(--muted); font-weight:800; margin-top:6px; }

.slider{
  margin-top: 16px;
  position:relative;
  overflow:hidden;
  border-radius: var(--radius);
}
.slider__track{
  display:flex;
  transition: transform .45s ease;
}
.slide{
  min-width:100%;
  padding:18px;
  background: rgba(255,255,255,.10);
  border:1px solid var(--border);
  box-shadow: var(--shadow);
}
.slide__quote{ margin:0; font-size:16px; line-height:1.6; color: rgba(255,255,255,.92); }
.slide__who{ margin-top: 12px; font-weight:900; color: rgba(255,255,255,.90); font-size:13px; letter-spacing:.2px; }

.slider__controls{
  display:flex;
  gap:10px;
  justify-content:flex-end;
  margin-top: 12px;
}

/* Get started area */
.get-start{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:14px;
  align-items:start;
}
.get-start__panel{ margin-top: 0; }
.tasks{
  margin:0;
  padding-left: 18px;
  display:grid;
  gap:10px;
}
.task{
  border:1px solid var(--border2);
  background: rgba(255,255,255,.08);
  border-radius: 14px;
  padding:12px;
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:10px;
}
.task__left{ display:flex; gap:10px; align-items:flex-start; }
.task__check{
  margin-top:3px;
  width:18px; height:18px;
  border-radius:6px;
  border:1px solid var(--border2);
  background: rgba(255,255,255,.10);
  cursor:pointer;
}
.task__check.done{
  background: rgba(86,255,185,.22);
  border-color: rgba(86,255,185,.65);
}
.task__title{ font-weight:900; }
.task__meta{ color: var(--muted); font-weight:700; font-size:12px; margin-top:4px; }
.task__tag{
  padding:6px 10px;
  border-radius:999px;
  border:1px solid var(--border);
  background: rgba(0,0,0,.12);
  color: var(--muted);
  font-weight:800;
  font-size:12px;
  height:fit-content;
}

/* Footer */
.footer{
  border-top:1px solid var(--border);
  padding: 26px 0;
  color: var(--muted);
}
.footer__inner{
  display:flex;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  align-items:flex-start;
}
.footer__brand{ font-weight:900; color: rgba(255,255,255,.92); }
body.theme--light .footer__brand{ color: rgba(15,23,42,.92); }
.footer__note{ margin-top:6px; max-width: 70ch; line-height:1.5; }
.footer__right{ display:flex; gap:12px; flex-wrap:wrap; }
.footer__link{ color: inherit; text-decoration:none; font-weight:800; }
.footer__link:hover{ text-decoration:underline; }

/* Modal */
.modal{ position:fixed; inset:0; display:none; z-index:2000; }
.modal.open{ display:block; }
.modal__backdrop{ position:absolute; inset:0; background: rgba(0,0,0,.45); }
.modal__panel{
  position:relative;
  width:min(520px, calc(100% - 24px));
  margin: 90px auto;
  background: rgba(15,23,42,.65);
  border:1px solid rgba(255,255,255,.18);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
body.theme--light .modal__panel{
  background: rgba(255,255,255,.86);
}
.modal__head{
  display:flex;
  justify-content:space-between;
  gap:10px;
  align-items:flex-start;
  margin-bottom: 12px;
}
.modal__title{ font-weight:900; font-size:18px; color: rgba(255,255,255,.96); }
body.theme--light .modal__title{ color: rgba(15,23,42,.96); }
.modal__subtitle{ color: var(--muted); font-weight:700; margin-top:6px; }

.form{ display:grid; gap:12px; }
.form__row{ display:flex; gap:10px; flex-wrap:wrap; }
.form__hint{ color: var(--muted); font-weight:700; font-size:13px; }

/* Reveal */
.reveal{
  opacity:0;
  transform: translateY(14px);
  transition: opacity .55s ease, transform .55s ease;
}
.reveal.show{
  opacity:1;
  transform: translateY(0);
}

/* Back to top */
.to-top{
  position:fixed;
  right:16px;
  bottom:16px;
  display:none;
  z-index:1500;
}
.to-top.show{ display:inline-flex; }

/* Responsive */
@media (max-width: 980px){
  .hero__inner{ grid-template-columns: 1fr; }
  .glass__grid{ grid-template-columns: 1fr 1fr; }
  .cards--3{ grid-template-columns: 1fr; }
  .practice{ grid-template-columns: 1fr; }
  .grid--3{ grid-template-columns: 1fr; }
  .get-start{ grid-template-columns: 1fr; }
}
@media (max-width: 720px){
  .nav__toggle{ display:inline-flex; }
  .nav__list{
    position: absolute;
    right: 20px;
    top: 70px;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 10px;
    background: rgba(15,23,42,.75);
    border:1px solid var(--border);
    border-radius: 16px;
    display:none;
    min-width: 220px;
  }
  body.theme--light .nav__list{
    background: rgba(255,255,255,.86);
  }
  .nav__list.open{ display:flex; }
}
.header__brand img {
    height: 42px;
  width: auto;
  display: block;
}