:root {
  --bg: #0f172a;
  --bg-2: #131c31;
  --card: #1a2338;
  --card-2: #212c46;
  --border: #2b3960;
  --text: #e6ebf5;
  --muted: #97a3bd;
  --brand: #2f6bff;
  --brand-2: #4b83ff;
  --accent: #16c79a;
  --danger: #ff5d73;
  --warn: #ffcf5c;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  background: radial-gradient(1200px 600px at 80% -10%, #1b294d 0, transparent 60%), var(--bg);
  background-color: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
  display: flex; flex-direction: column;
}
main { flex: 1 0 auto; }
a { color: var(--brand-2); text-decoration: none; }
a:hover { color: #7aa4ff; }

/* NAV */
.nav-lapin {
  background: rgba(15, 23, 42, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  padding: .55rem 0;
}
.navbar-brand { color: var(--text) !important; font-size: 1.15rem; letter-spacing: .2px; }
.navbar-brand strong { color: var(--brand-2); }
.brand-mark {
  display: inline-grid; place-items: center; width: 30px; height: 30px;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #fff; font-weight: 800; border-radius: 8px; margin-right: 6px;
}
.brand-by { color: var(--muted); font-size: .8rem; margin-left: 4px; }
.nav-lapin .nav-link { color: var(--muted) !important; font-weight: 500; }
.nav-lapin .nav-link:hover { color: var(--text) !important; }
.navbar-toggler { border-color: var(--border); }

/* CARDS / GLASS */
.card-glass {
  background: linear-gradient(180deg, var(--card), var(--bg-2));
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
}
.section { padding: 2.2rem 0; }
.muted { color: var(--muted); }
.eyebrow { color: var(--accent); font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; font-size: .78rem; }

/* HERO */
.hero { padding: 3.4rem 0 2.4rem; }
.hero h1 { font-size: 2.5rem; font-weight: 800; line-height: 1.1; }
.hero h1 span { background: linear-gradient(120deg, var(--brand-2), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { color: var(--muted); font-size: 1.12rem; max-width: 620px; }

/* BUTTONS */
.btn-brand { background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; border: none; font-weight: 700; border-radius: 10px; padding: .7rem 1.4rem; }
.btn-brand:hover { filter: brightness(1.08); color: #fff; }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); border-radius: 10px; padding: .7rem 1.4rem; font-weight: 600; }
.btn-ghost:hover { border-color: var(--brand); color: #fff; }

/* MODULE GRID */
.mod-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; }
.mod-card { padding: 1.1rem 1.2rem; display: flex; flex-direction: column; gap: .5rem; transition: transform .12s, border-color .12s; }
.mod-card:hover { transform: translateY(-3px); border-color: var(--brand); }
.mod-num { font-size: .75rem; color: var(--muted); font-weight: 700; }
.mod-card h3 { font-size: 1.05rem; margin: 0; color: var(--text); }
.mod-card .resumo { color: var(--muted); font-size: .88rem; flex: 1; }
.mod-meta { display: flex; align-items: center; justify-content: space-between; font-size: .8rem; color: var(--muted); margin-top: .3rem; }
.badge-free { background: rgba(22,199,154,.16); color: var(--accent); border: 1px solid rgba(22,199,154,.4); padding: .12rem .5rem; border-radius: 999px; font-weight: 700; font-size: .72rem; }
.badge-lock { color: var(--warn); }

/* PROGRESS */
.progress-lapin { height: 8px; background: var(--card-2); border-radius: 999px; overflow: hidden; }
.progress-lapin > span { display: block; height: 100%; background: linear-gradient(90deg, var(--brand), var(--accent)); }

/* PLAYER LAYOUT */
.player { display: grid; grid-template-columns: 300px 1fr; gap: 1.4rem; align-items: start; }
.sidebar { position: sticky; top: 1rem; max-height: calc(100vh - 2rem); overflow-y: auto; padding: .8rem; }
.sidebar h4 { font-size: .9rem; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; padding: .3rem .4rem; }
.les-link { display: flex; gap: .5rem; align-items: baseline; padding: .4rem .55rem; border-radius: 8px; color: var(--muted); font-size: .9rem; }
.les-link:hover { background: var(--card-2); color: var(--text); }
.les-link.active { background: rgba(47,107,255,.16); color: #fff; border-left: 3px solid var(--brand); }
.les-link.done { color: var(--accent); }
.les-check { font-size: .8rem; width: 14px; }

/* LESSON CONTENT */
.lesson { padding: 1.6rem 2rem; }
.lesson h1 { font-size: 1.7rem; font-weight: 800; margin-bottom: .3rem; }
.lesson h3 { color: var(--brand-2); font-size: 1.15rem; margin: 1.6rem 0 .6rem; }
.lesson p { line-height: 1.7; color: #d8dfef; }
.lesson ul, .lesson ol { line-height: 1.7; color: #d8dfef; }
.lesson blockquote { border-left: 3px solid var(--border); margin: 1rem 0; padding: .3rem 1rem; color: var(--muted); font-style: italic; }
.lesson code { background: var(--card-2); color: #ffd479; padding: .1rem .35rem; border-radius: 5px; font-size: .9em; }
figure.tela { margin: 1.4rem 0; text-align: center; }
figure.tela img { max-width: 100%; border: 1px solid var(--border); border-radius: 10px; background: #fff; }
figure.tela figcaption { color: var(--muted); font-size: .8rem; margin-top: .4rem; }
.tabela-wrap { overflow-x: auto; margin: 1.2rem 0; }
.lesson table { width: 100%; border-collapse: collapse; }
.lesson th, .lesson td { border: 1px solid var(--border); padding: .5rem .7rem; text-align: left; }
.lesson thead th { background: var(--card-2); color: var(--text); }

/* lesson footer nav */
.les-nav { display: flex; justify-content: space-between; gap: 1rem; margin-top: 2rem; padding-top: 1.2rem; border-top: 1px solid var(--border); }

/* FOOTER */
.footer-lapin { border-top: 1px solid var(--border); color: var(--muted); padding: 1.2rem 0; font-size: .85rem; flex-shrink: 0; }

/* FORMS (Identity) */
.form-control, .form-select { background: var(--card); border: 1px solid var(--border); color: var(--text); }
.form-control:focus { background: var(--card); border-color: var(--brand); color: var(--text); box-shadow: 0 0 0 .2rem rgba(47,107,255,.2); }
label, .form-label { color: var(--text); }

@@media (max-width: 800px) {
  .player { grid-template-columns: 1fr; }
  .sidebar { position: static; max-height: none; }
  .hero h1 { font-size: 2rem; }
  .lesson { padding: 1.2rem; }
}