:root {
  --bg: #F5F4EF; --card: #FDFCF9; --line: #E0DDD3; --ink: #141A2A; --muted: #4A5263;
  --accent: #2F54EB; --accent-soft: #E4E9FD; --dark: #0E1320; --ok: #12805C; --err: #C2352B;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); font-family: Inter, Arial, sans-serif; font-size: 16px; line-height: 1.5; }
a { color: var(--accent); text-decoration: none; }
h1, h2, h3 { font-family: 'Space Grotesk', Arial, sans-serif; line-height: 1.15; margin: 0 0 12px; }
h1 { font-size: 36px; } h2, .h2 { font-size: 28px; } h3 { font-size: 20px; }
p { margin: 0 0 12px; }
.accent { color: var(--accent); }
.eyebrow { font-size: 12px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--accent); margin: 0 0 8px; }
.lead { font-size: 18px; color: var(--muted); max-width: 760px; margin-bottom: 28px; }
.muted { color: var(--muted); } .small { font-size: 13px; }
.big { font-family: 'Space Grotesk', Arial, sans-serif; font-size: 44px; font-weight: 700; margin: 0; }
pre { background: var(--dark); color: #E4E9FD; padding: 16px; border-radius: 12px; white-space: pre-wrap; font-size: 14px; }
table { width: 100%; border-collapse: collapse; margin: 8px 0 12px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); font-size: 15px; }
th { color: var(--muted); font-weight: 600; }
blockquote { margin: 0 0 12px; padding: 12px 16px; border-left: 4px solid var(--accent); background: var(--accent-soft); border-radius: 0 10px 10px 0; }
code { background: #ECE9E0; padding: 1px 6px; border-radius: 6px; font-size: 14px; }
pre code { background: none; padding: 0; }

/* layout */
.side { position: fixed; inset: 0 auto 0 0; width: 260px; background: #FBFAF6; border-right: 1px solid var(--line); display: flex; flex-direction: column; padding: 20px 16px; overflow-y: auto; z-index: 5; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-family: 'Space Grotesk', Arial, sans-serif; font-weight: 700; font-size: 18px; margin-bottom: 24px; }
.brand small { display: block; font-family: Inter, Arial, sans-serif; font-weight: 400; font-size: 12px; color: var(--muted); }
.logo { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: var(--dark); color: #8EA4FF; font-family: 'Space Grotesk', Arial, sans-serif; font-weight: 700; }
.logo.big { width: 56px; height: 56px; font-size: 26px; border-radius: 16px; margin-bottom: 16px; }
.nav-group { margin-bottom: 18px; display: flex; flex-direction: column; gap: 2px; }
.nav-group span { font-size: 11px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: #8A8F9C; margin: 0 10px 6px; }
.nav-group a { color: var(--ink); padding: 8px 10px; border-radius: 8px; font-size: 15px; }
.nav-group a:hover { background: #EFEDE6; }
.nav-group a.on { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.me { margin-top: auto; border-top: 1px solid var(--line); padding-top: 14px; display: flex; flex-direction: column; font-size: 13px; }
.me span { color: var(--muted); overflow: hidden; text-overflow: ellipsis; }
.main { margin-left: 260px; padding: 40px 48px 80px; max-width: 1240px; }
.menu-btn { display: none; }
.back { display: inline-block; margin-bottom: 16px; font-size: 14px; color: var(--muted); }

/* cards */
.card { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 24px; margin-bottom: 20px; }
.card.wide { margin-top: 4px; }
.card.ok { border-color: var(--ok); }
.cards3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 4px; }
.cards2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.btn { display: inline-block; background: var(--accent); color: #F5F4EF; border: 0; border-radius: 10px; padding: 10px 18px; font: inherit; font-weight: 600; cursor: pointer; margin: 4px 8px 4px 0; }
.btn:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.tag { display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 1px; padding: 4px 10px; border-radius: 999px; background: #ECE9E0; color: var(--muted); margin-bottom: 10px; }
.tag.dark { background: var(--dark); color: #F5F4EF; }
.bar { height: 8px; background: #ECE9E0; border-radius: 99px; overflow: hidden; margin: 10px 0 6px; }
.bar i { display: block; height: 100%; background: var(--accent); }
.erro { color: var(--err); background: #FBE9E7; padding: 10px 14px; border-radius: 10px; }

/* cérebro */
.map { background: var(--dark); border-radius: 22px; padding: 12px; margin-bottom: 24px; }
.map svg { width: 100%; height: auto; display: block; }
.map .l line { stroke: #34426E; stroke-width: 3; }
.map .n circle { fill: #8EA4FF; }
.map .n text, .map .hubt { fill: #F5F4EF; font: 600 22px Inter, Arial, sans-serif; text-anchor: middle; }
.map .hub { fill: var(--accent); }

/* formação */
.mods { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.mod { display: flex; flex-direction: column; background: var(--dark); color: #F5F4EF; border-radius: 18px; padding: 22px; min-height: 220px; }
.mod .codigo { color: #8EA4FF; font-weight: 700; font-size: 13px; }
.mod h3 { margin: 6px 0 8px; }
.mod p { color: #B8BFD0; font-size: 14px; flex: 1; }
.mod small { color: #B8BFD0; }
.mod .bar { background: #1F2740; }
.mod.off { opacity: .55; }
.mod .tag { background: #1F2740; color: #B8BFD0; align-self: flex-start; }
.aulas { display: flex; flex-direction: column; gap: 10px; max-width: 820px; }
.aula-item { display: flex; gap: 16px; align-items: center; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; color: var(--ink); }
.aula-item .num { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font-weight: 700; flex: none; }
.aula-item.feita .num { background: var(--ok); color: #fff; }
.aula-item small { display: block; color: var(--muted); }
.aula-grid { display: grid; grid-template-columns: 1fr 320px; gap: 28px; align-items: start; }
.video { aspect-ratio: 16/9; background: var(--dark); border-radius: 18px; overflow: hidden; margin-bottom: 20px; }
.video iframe { width: 100%; height: 100%; border: 0; }
.video.vazio { display: flex; flex-direction: column; align-items: center; justify-content: center; color: #B8BFD0; }
.video.vazio span { display: grid; place-items: center; width: 64px; height: 64px; border-radius: 50%; background: var(--accent); color: #fff; font-size: 24px; margin-bottom: 12px; }
.video.vazio p { color: #F5F4EF; font-weight: 600; margin: 0; }
.material ol, .material ul { padding-left: 22px; }
.extras { margin: -6px 0 16px; }
.aula-acoes { display: flex; flex-wrap: wrap; align-items: center; gap: 4px; }
.aula-acoes form { margin: 0; }
.aula-lista { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 18px; position: sticky; top: 24px; }
.aula-lista a { display: flex; gap: 10px; padding: 8px; border-radius: 8px; color: var(--ink); font-size: 14px; }
.aula-lista a span { color: var(--muted); width: 18px; flex: none; }
.aula-lista a.on { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.aula-lista a.feita span { color: var(--ok); }

/* salas */
.sala-top { display: flex; justify-content: space-between; gap: 24px; align-items: center; }
.countdown { display: flex; gap: 10px; }
.countdown div { background: #ECE9E0; border-radius: 12px; padding: 10px 12px; text-align: center; min-width: 64px; }
.countdown b { display: block; font-family: 'Space Grotesk', Arial, sans-serif; font-size: 26px; }
.countdown small { color: var(--muted); font-size: 12px; }
.salas-grid { display: grid; grid-template-columns: 1fr 320px; gap: 20px; align-items: start; }
.sala-item { display: flex; gap: 20px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; margin-bottom: 10px; }
.sala-item > div:first-child { width: 150px; flex: none; }
.sala-item span, .sala-item small { display: block; color: var(--muted); }
.mentor { display: flex; gap: 12px; align-items: center; margin: 12px 0; }
.mentor .ini { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; background: var(--dark); color: #8EA4FF; font-weight: 700; }
.mentor small { display: block; color: var(--muted); }

/* soluções */
.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.tabs a { padding: 8px 14px; border-radius: 999px; background: var(--card); border: 1px solid var(--line); color: var(--ink); font-size: 14px; }
.tabs a.on { background: var(--dark); color: #F5F4EF; border-color: var(--dark); }
.sols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.sol { display: flex; flex-direction: column; background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 22px; }
.sol p:not(.eyebrow) { color: var(--muted); flex: 1; }
.sol .btn { align-self: flex-start; }

/* construtor */
.chat { display: flex; flex-direction: column; min-height: 520px; padding: 0; overflow: hidden; }
#log { flex: 1; padding: 20px; display: flex; flex-direction: column; gap: 14px; max-height: 62vh; overflow-y: auto; }
.sugs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.sugs button { text-align: left; background: #F1EFE8; border: 1px solid var(--line); border-radius: 12px; padding: 14px; font: inherit; color: var(--ink); cursor: pointer; }
.sugs button:hover { border-color: var(--accent); }
.msg { max-width: 88%; padding: 14px 16px; border-radius: 16px; overflow-wrap: anywhere; }
.msg.user { align-self: flex-end; background: var(--accent); color: #F5F4EF; white-space: pre-wrap; border-bottom-right-radius: 4px; }
.msg.ai { align-self: flex-start; background: #FFFFFF; border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.msg.ai p:last-child { margin-bottom: 0; }
.msg.ai ul, .msg.ai ol { padding-left: 22px; }
#f { display: flex; gap: 10px; padding: 14px; border-top: 1px solid var(--line); background: #FBFAF6; }
#f textarea { flex: 1; resize: none; border: 1px solid #D5D1C5; border-radius: 12px; padding: 12px; font: inherit; }
#f .btn { margin: 0; }

/* forms */
.form label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 12px; }
.form input, .form select, .login-box input { display: block; width: 100%; margin-top: 6px; padding: 11px 12px; border: 1px solid #D5D1C5; border-radius: 10px; font: inherit; background: #fff; }
body.login { display: grid; place-items: center; min-height: 100vh; background: var(--dark); }
.login-box { width: min(420px, calc(100vw - 32px)); background: var(--card); border-radius: 22px; padding: 32px; }
.login-box label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 14px; }
.login-box button { width: 100%; background: var(--accent); color: #fff; border: 0; border-radius: 12px; padding: 13px; font: inherit; font-weight: 700; cursor: pointer; margin-top: 4px; }

/* celular */
@media (max-width: 900px) {
  .side { transform: translateX(-100%); transition: transform .25s; box-shadow: 0 0 40px rgba(0,0,0,.2); }
  body.menu .side { transform: none; }
  .menu-btn { display: block; position: fixed; top: 12px; left: 12px; z-index: 6; background: var(--dark); color: #fff; border: 0; border-radius: 10px; padding: 8px 12px; font: inherit; }
  .main { margin-left: 0; padding: 64px 16px 60px; }
  h1 { font-size: 28px; }
  .cards3, .cards2, .mods, .sols, .sugs, .aula-grid, .salas-grid { grid-template-columns: 1fr; }
  .sala-top { flex-direction: column; align-items: flex-start; }
  .aula-lista { position: static; }
}