/* =========================================================
 * Tokens
 * ======================================================= */
:root {
  --bg: #06090f;
  --bg-2: #0a0f18;
  --glass: rgba(16, 22, 34, .58);
  --glass-2: rgba(22, 30, 46, .62);
  --glass-strong: rgba(12, 17, 27, .82);
  --line: rgba(148, 163, 184, .13);
  --line-2: rgba(148, 163, 184, .22);
  --grid: rgba(148, 163, 184, .055);
  --text: #e8edf4;
  --text-2: #9ba7b9;
  --text-3: #66738a;
  --accent: #2ee6c5;
  --accent-ink: #04211c;
  --accent-soft: rgba(46, 230, 197, .12);
  --accent-line: rgba(46, 230, 197, .35);
  --orb-1: rgba(46, 230, 197, .16);
  --orb-2: rgba(56, 132, 255, .14);
  --danger: #ff5c7a;
  --warn: #ffb547;
  --ok: #3ddc84;
  --shadow: 0 1px 0 rgba(255,255,255,.04) inset, 0 18px 40px -22px rgba(0,0,0,.7);
  --radius: 16px;
  --radius-sm: 10px;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --display: 'Space Grotesk', 'IBM Plex Sans', system-ui, sans-serif;
  --sans: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sidebar: 300px;
  --topbar: 62px;
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #eef2f7;
  --bg-2: #e6ebf2;
  --glass: rgba(255, 255, 255, .62);
  --glass-2: rgba(255, 255, 255, .75);
  --glass-strong: rgba(255, 255, 255, .88);
  --line: rgba(15, 23, 42, .09);
  --line-2: rgba(15, 23, 42, .16);
  --grid: rgba(15, 23, 42, .045);
  --text: #0d1524;
  --text-2: #4a5568;
  --text-3: #7c889c;
  --accent: #0b8f7b;
  --accent-ink: #ffffff;
  --accent-soft: rgba(11, 143, 123, .10);
  --accent-line: rgba(11, 143, 123, .35);
  --orb-1: rgba(46, 230, 197, .22);
  --orb-2: rgba(56, 132, 255, .16);
  --shadow: 0 1px 0 rgba(255,255,255,.7) inset, 0 16px 36px -24px rgba(15,23,42,.35);
  color-scheme: light;
}

/* =========================================================
 * Base
 * ======================================================= */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; min-height: 100vh; background: var(--bg); color: var(--text);
  font: 15px/1.65 var(--sans); -webkit-font-smoothing: antialiased;
}
body::before {
  content: ''; position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 35%, transparent 80%);
          mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 35%, transparent 80%);
}
.orbs { position: fixed; inset: 0; z-index: -3; overflow: hidden; pointer-events: none; }
.orbs i { position: absolute; border-radius: 50%; filter: blur(90px); }
.orbs i:nth-child(1) { width: 560px; height: 560px; background: var(--orb-1); top: -180px; right: -120px; animation: drift1 38s var(--ease) infinite alternate; }
.orbs i:nth-child(2) { width: 520px; height: 520px; background: var(--orb-2); bottom: -220px; left: 10%; animation: drift2 46s var(--ease) infinite alternate; }
@keyframes drift1 { to { transform: translate(-140px, 120px) scale(1.1); } }
@keyframes drift2 { to { transform: translate(160px, -100px) scale(.92); } }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
code { font-family: var(--mono); font-size: .85em; background: var(--accent-soft); color: var(--text); border: 1px solid var(--line); padding: .05em .4em; border-radius: 6px; }
h1, h2, h3, h4 { font-family: var(--display); line-height: 1.2; margin: 0; letter-spacing: -.02em; font-weight: 600; }
button { font: inherit; color: inherit; cursor: pointer; }
input, textarea, select { font: inherit; color: inherit; }
::selection { background: var(--accent-line); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
svg.i { width: 16px; height: 16px; flex: none; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* =========================================================
 * Glass primitives
 * ======================================================= */
.glass, .card {
  background: var(--glass);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
          backdrop-filter: blur(18px) saturate(140%);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.card { position: relative; border-radius: var(--radius); padding: 22px; overflow: hidden; }
/* luz que acompanha o cursor */
.card::before {
  content: ''; position: absolute; inset: 0; pointer-events: none; opacity: 0; transition: opacity .3s;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 50%), var(--accent-soft), transparent 45%);
}
.card:hover::before { opacity: 1; }
.card > * { position: relative; }

/* =========================================================
 * Topbar
 * ======================================================= */
.topbar {
  position: sticky; top: 0; z-index: 30; height: var(--topbar);
  display: flex; align-items: center; gap: 12px; padding: 0 18px;
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  -webkit-backdrop-filter: blur(16px) saturate(140%); backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 9px; display: grid; place-items: center;
  background: var(--accent); color: var(--accent-ink); font: 700 12px var(--mono); letter-spacing: -.02em;
  box-shadow: 0 0 0 1px var(--accent-line), 0 6px 18px -6px var(--accent);
}
.brand-text { font: 500 15px var(--display); letter-spacing: -.01em; }
.brand-text b { font-weight: 700; }
.brand-text span { color: var(--text-3); font-family: var(--mono); font-size: 12px; margin-left: 6px; }
.search {
  flex: 1; min-width: 0; max-width: 480px; margin-left: auto; display: flex; align-items: center; gap: 8px;
  background: var(--glass); border: 1px solid var(--line); border-radius: 11px; padding: 0 12px; color: var(--text-3);
  transition: border-color .2s, box-shadow .2s;
}
.search:focus-within { border-color: var(--accent-line); box-shadow: 0 0 0 4px var(--accent-soft); }
.search input { flex: 1; min-width: 0; border: 0; outline: 0; background: transparent; height: 38px; color: var(--text); font-size: 14px; }
.search .kbd { flex: none; }
.icon-btn {
  flex: none; height: 38px; min-width: 38px; padding: 0 10px; display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border-radius: 11px; border: 1px solid var(--line); background: var(--glass); color: var(--text-2);
  font: 600 12px var(--mono); transition: color .2s, border-color .2s, transform .15s;
}
.icon-btn:hover { color: var(--text); border-color: var(--line-2); }
.icon-btn:active { transform: scale(.96); }
.lang-btn b { color: var(--accent); }
.sync-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--text-3); }
.sync-dot.on { background: var(--ok); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 25%, transparent); }
.sync-dot.busy { background: var(--warn); animation: pulse 1s infinite; }
.sync-dot.err { background: var(--danger); }
@keyframes pulse { 50% { opacity: .35; } }
.menu-btn { display: none; }

/* =========================================================
 * Layout
 * ======================================================= */
.layout { display: grid; grid-template-columns: var(--sidebar) 1fr; min-height: calc(100vh - var(--topbar)); }
.sidebar {
  position: sticky; top: var(--topbar); height: calc(100vh - var(--topbar)); overflow-y: auto;
  border-right: 1px solid var(--line); padding: 18px 12px 40px;
  background: color-mix(in srgb, var(--bg) 55%, transparent);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  scrollbar-width: thin; scrollbar-color: var(--line-2) transparent;
}
.main { min-width: 0; padding: 34px clamp(16px, 4vw, 56px) 96px; outline: none; }
.container { max-width: 1040px; margin: 0 auto; }
.scrim { display: none; }
.bottom-nav { display: none; }

/* View transitions */
.view { animation: viewIn .5s var(--ease) both; }
@keyframes viewIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.rise { animation: rise .55s var(--ease) both; animation-delay: calc(var(--i, 0) * 45ms); }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

/* =========================================================
 * Sidebar
 * ======================================================= */
.nav-group { margin-bottom: 18px; }
.nav-label { display: flex; align-items: center; gap: 8px; font: 600 10.5px var(--mono); text-transform: uppercase; letter-spacing: .12em; color: var(--text-3); padding: 0 10px 8px; }
.nav-label::before { content: ''; width: 6px; height: 6px; border-radius: 2px; background: var(--c, var(--text-3)); }
.nav-link {
  position: relative; display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 10px;
  color: var(--text-2); font-size: 13.5px; transition: background .2s, color .2s;
}
.nav-link:hover { background: var(--glass-2); color: var(--text); text-decoration: none; }
.nav-link.active { background: var(--accent-soft); color: var(--text); }
.nav-link.active::before { content: ''; position: absolute; left: -12px; top: 8px; bottom: 8px; width: 3px; border-radius: 0 3px 3px 0; background: var(--accent); }
.nav-link .num {
  flex: none; width: 26px; height: 24px; border-radius: 7px; display: grid; place-items: center;
  font: 600 11px var(--mono); background: var(--glass-2); border: 1px solid var(--line); color: var(--text-2);
}
.nav-link .t { flex: 1; min-width: 0; line-height: 1.3; }
.nav-link .pct { font: 500 11px var(--mono); color: var(--text-3); }
.nav-link.done .num { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.nav-sub { margin: 4px 0 10px 22px; border-left: 1px dashed var(--line-2); padding-left: 8px; animation: rise .35s var(--ease) both; }
.nav-sub a { display: flex; gap: 8px; align-items: center; padding: 5px 8px; border-radius: 7px; font-size: 12.5px; color: var(--text-3); line-height: 1.35; }
.nav-sub a:hover { color: var(--text); background: var(--glass-2); text-decoration: none; }
.nav-sub a.active { color: var(--accent); background: var(--accent-soft); }
.dot { flex: none; width: 8px; height: 8px; border-radius: 50%; border: 1.5px solid var(--line-2); }
.dot.s1 { border-color: var(--warn); background: color-mix(in srgb, var(--warn) 40%, transparent); }
.dot.s2 { border-color: var(--accent); background: var(--accent); }

/* =========================================================
 * Generic UI
 * ======================================================= */
.grid { display: grid; gap: 14px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.muted { color: var(--text-2); }
.faint { color: var(--text-3); }
.small { font-size: 13px; }
.mono { font-family: var(--mono); }
.section { margin-top: 38px; }
.section-title { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 4px 12px; margin-bottom: 14px; }
.section-title h2 { font-size: 20px; }
.section-title h2 .idx { font: 500 12px var(--mono); color: var(--accent); margin-right: 10px; letter-spacing: .04em; vertical-align: 3px; }
.section-title .hint { font: 12px var(--mono); color: var(--text-3); }
.eyebrow { font: 500 12px var(--mono); letter-spacing: .04em; color: var(--accent); }
.eyebrow .faint { color: var(--text-3); }
.badge {
  display: inline-flex; align-items: center; gap: 6px; font: 600 11.5px var(--mono); padding: 4px 10px; border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--c, var(--accent)) 45%, transparent);
  background: color-mix(in srgb, var(--c, var(--accent)) 12%, transparent); color: var(--c, var(--accent));
}
.chip {
  display: inline-flex; align-items: center; gap: 7px; font: 500 12px var(--mono); color: var(--text-2);
  background: var(--glass-2); border: 1px solid var(--line); padding: 4px 11px; border-radius: 999px;
}
.chip svg.i { width: 13px; height: 13px; color: var(--text-3); }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 40px; padding: 0 16px; border-radius: 11px;
  border: 1px solid var(--line-2); background: var(--glass-2); font-weight: 600; font-size: 14px; color: var(--text);
  transition: border-color .2s, transform .15s, box-shadow .2s, background .2s;
}
.btn:hover { border-color: var(--accent-line); text-decoration: none; }
.btn:active { transform: scale(.97); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); box-shadow: 0 8px 24px -10px var(--accent); }
.btn.primary:hover { box-shadow: 0 10px 28px -8px var(--accent); }
.btn.danger { color: var(--danger); }
.btn.sm { height: 34px; padding: 0 13px; font-size: 13px; border-radius: 9px; }
.btn[disabled] { opacity: .5; pointer-events: none; }
.bar { height: 6px; border-radius: 99px; background: var(--glass-2); border: 1px solid var(--line); overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--accent); border-radius: inherit; transform-origin: left; animation: barIn 1s var(--ease) both; box-shadow: 0 0 12px var(--accent-line); }
@keyframes barIn { from { transform: scaleX(0); } }
.bar.thin { height: 4px; }
.ring { flex: none; }
.ring .bg { stroke: var(--line); }
.ring .fg { stroke: var(--accent); animation: ringIn 1.1s var(--ease) both; filter: drop-shadow(0 0 6px var(--accent-line)); }
@keyframes ringIn { from { stroke-dashoffset: var(--c); } }
.ring text { fill: var(--text); font-family: var(--mono); font-weight: 600; }
.kbd { font: 600 10.5px var(--mono); border: 1px solid var(--line-2); border-bottom-width: 2px; border-radius: 5px; padding: 0 5px; color: var(--text-3); }
.legend { display: inline-flex; align-items: center; gap: 6px; }
.legend::before { content: ''; width: 8px; height: 8px; border-radius: 50%; background: var(--c); }

/* =========================================================
 * Home
 * ======================================================= */
.hero { position: relative; overflow: hidden; border-radius: 22px; padding: clamp(24px, 4vw, 44px); }
.hero::after {
  content: ''; position: absolute; inset: 0; pointer-events: none; border-radius: inherit;
  background: linear-gradient(120deg, transparent 40%, var(--accent-soft) 50%, transparent 60%);
  background-size: 250% 100%; animation: sheen 9s var(--ease) infinite;
}
@keyframes sheen { 0%, 60% { background-position: 120% 0; } 100% { background-position: -120% 0; } }
.term { font: 13px var(--mono); color: var(--text-3); display: flex; flex-wrap: wrap; gap: 0 8px; }
.term .p { color: var(--accent); }
.term .s { color: var(--text-2); }
.caret { display: inline-block; width: 8px; height: 15px; background: var(--accent); vertical-align: -2px; animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.hero h1 { font-size: clamp(30px, 4.6vw, 50px); font-weight: 600; margin: 14px 0 12px; letter-spacing: -.035em; line-height: 1.05; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p { color: var(--text-2); max-width: 680px; margin: 0; font-size: 16px; }
.goal-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.stat .k { font: 500 11px var(--mono); color: var(--text-3); text-transform: uppercase; letter-spacing: .1em; }
.stat .v { font: 600 32px/1.1 var(--display); margin: 8px 0 12px; letter-spacing: -.03em; }
.stat .v small { font: 500 14px var(--mono); color: var(--text-3); }
.next-card { display: flex; gap: 18px; align-items: center; }
.next-card .body { flex: 1; min-width: 0; }
.next-card h3 { font-size: 17px; margin: 6px 0 4px; }
.ladder { display: grid; grid-template-columns: repeat(6, minmax(0,1fr)); gap: 10px; }
.rung { padding: 16px; }
.rung::after { content: ''; position: absolute; left: 0; top: 14px; bottom: 14px; width: 2px; border-radius: 2px; background: var(--c); }
.rung h4 { font-size: 14.5px; margin-bottom: 4px; }
.rung .faint { font-size: 12px; line-height: 1.5; }
.phase-card { display: flex; flex-direction: column; gap: 10px; color: var(--text); transition: border-color .25s, transform .25s var(--ease); }
.phase-card:hover { border-color: var(--accent-line); transform: translateY(-3px); text-decoration: none; }
.phase-card .top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.phase-card .n { font: 600 12px var(--mono); color: var(--text-3); }
.phase-card h3 { font-size: 17px; }
.phase-card p { margin: 0; color: var(--text-2); font-size: 13.5px; flex: 1; line-height: 1.55; }
.phase-card .meta { display: flex; justify-content: space-between; font: 11.5px var(--mono); color: var(--text-3); }
.heat { display: grid; grid-auto-flow: column; grid-template-rows: repeat(7, 11px); gap: 3px; overflow-x: auto; padding-bottom: 4px; }
.heat i { width: 11px; height: 11px; border-radius: 3px; background: var(--glass-2); border: 1px solid var(--line); }
.heat i.l1 { background: color-mix(in srgb, var(--accent) 25%, transparent); border-color: transparent; }
.heat i.l2 { background: color-mix(in srgb, var(--accent) 50%, transparent); border-color: transparent; }
.heat i.l3 { background: color-mix(in srgb, var(--accent) 75%, transparent); border-color: transparent; }
.heat i.l4 { background: var(--accent); border-color: transparent; }
.method { counter-reset: m; display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); padding: 0; margin: 0; }
.method li { list-style: none; counter-increment: m; padding: 18px 18px 18px 56px; font-size: 14px; color: var(--text-2); border-radius: 14px; }
.method li::after { content: counter(m, decimal-leading-zero); position: absolute; left: 18px; top: 18px; font: 600 13px var(--mono); color: var(--accent); }
.method li b { color: var(--text); display: block; margin-bottom: 3px; font-family: var(--display); font-weight: 600; }
.inline-input { width: 64px; height: 30px; border-radius: 8px; border: 1px solid var(--line-2); background: var(--glass-2); text-align: center; font-family: var(--mono); }

/* =========================================================
 * Phase / Topic headers
 * ======================================================= */
.crumbs { font: 12.5px var(--mono); color: var(--text-3); display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 18px; }
.crumbs a { color: var(--text-3); }
.crumbs a:hover { color: var(--accent); }
.crumbs .sep { opacity: .5; }
.page-head { display: flex; gap: 24px; align-items: flex-start; justify-content: space-between; }
.page-head h1 { font-size: clamp(28px, 3.8vw, 40px); letter-spacing: -.03em; margin: 10px 0 12px; }
.page-head .lead { color: var(--text-2); font-size: 16px; max-width: 760px; margin: 0; }
.meta-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.why { margin-top: 24px; padding: 16px 20px; border-radius: 14px; border-left: 2px solid var(--accent); }
.why b { color: var(--accent); font-family: var(--mono); font-weight: 600; font-size: 12px; letter-spacing: .06em; text-transform: uppercase; display: block; margin-bottom: 4px; }
.outcomes { margin: 0; padding: 0; list-style: none; color: var(--text-2); display: grid; gap: 8px; }
.outcomes li { padding-left: 22px; position: relative; }
.outcomes li::before { content: '→'; position: absolute; left: 0; color: var(--accent); font-family: var(--mono); }

.topic-card { display: flex; gap: 16px; align-items: flex-start; color: var(--text); transition: border-color .25s, transform .25s var(--ease); }
.topic-card:hover { border-color: var(--accent-line); transform: translateX(3px); text-decoration: none; }
.topic-card .idx { flex: none; font: 600 12px var(--mono); color: var(--text-3); width: 44px; height: 38px; border-radius: 10px; display: grid; place-items: center; background: var(--glass-2); border: 1px solid var(--line); }
.topic-card.s2 .idx { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.topic-card.s1 .idx { border-color: var(--warn); color: var(--warn); }
.topic-card .body { flex: 1; min-width: 0; }
.topic-card h3 { font-size: 16.5px; margin-bottom: 4px; }
.topic-card p { margin: 0 0 10px; font-size: 13.5px; color: var(--text-2); line-height: 1.55; }
.topic-card .meta { display: flex; gap: 14px; font: 11.5px var(--mono); color: var(--text-3); margin-bottom: 10px; flex-wrap: wrap; }

/* =========================================================
 * Checklists & resources
 * ======================================================= */
.checklist { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.checklist label { display: flex; gap: 12px; align-items: flex-start; padding: 9px 10px; border-radius: 10px; cursor: pointer; transition: background .2s; }
.checklist label:hover { background: var(--glass-2); }
.checklist input {
  appearance: none; flex: none; width: 18px; height: 18px; margin-top: 3px; border-radius: 6px; border: 1.5px solid var(--line-2);
  background: transparent; display: grid; place-items: center; cursor: pointer; transition: background .2s, border-color .2s, transform .15s;
}
.checklist input:active { transform: scale(.85); }
.checklist input:checked { background: var(--accent); border-color: var(--accent); }
.checklist input:checked::after { content: ''; width: 5px; height: 9px; border: solid var(--accent-ink); border-width: 0 2px 2px 0; transform: rotate(45deg) translate(-1px, -1px); animation: pop .25s var(--ease); }
@keyframes pop { from { transform: rotate(45deg) scale(0); } }
.checklist span { font-size: 14.5px; transition: color .2s; }
.checklist input:checked + span { color: var(--text-3); text-decoration: line-through; text-decoration-color: var(--line-2); }
.res-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.res-list a {
  display: flex; gap: 10px; align-items: center; padding: 12px 14px; border-radius: 12px; color: var(--text); font-size: 14px;
  transition: border-color .2s, transform .2s var(--ease);
}
.res-list a:hover { border-color: var(--accent-line); text-decoration: none; transform: translateY(-2px); }
.res-list .ext { margin-left: auto; color: var(--text-3); flex: none; }
.res-list .k { flex: none; font: 600 10px var(--mono); text-transform: uppercase; letter-spacing: .06em; padding: 2px 7px; border-radius: 5px; background: var(--accent-soft); color: var(--accent); }

/* Como estudar */
.howto { display: grid; grid-template-columns: 1.1fr 1fr; gap: 14px; }
.steps { margin: 0; padding: 0; list-style: none; counter-reset: s; display: grid; gap: 10px; }
.steps li { counter-increment: s; display: grid; grid-template-columns: 30px 1fr; gap: 10px; font-size: 14px; color: var(--text-2); }
.steps li::before { content: counter(s, decimal-leading-zero); font: 600 12px/1.9 var(--mono); color: var(--accent); }
.steps li b { color: var(--text); font-weight: 600; }
.search-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.search-links a {
  display: flex; align-items: center; gap: 10px; padding: 11px 12px; border-radius: 11px; color: var(--text); font-size: 13.5px; font-weight: 500;
  background: var(--glass-2); border: 1px solid var(--line); transition: border-color .2s, transform .2s var(--ease), background .2s;
}
.search-links a:hover { border-color: var(--accent-line); background: var(--accent-soft); text-decoration: none; transform: translateY(-2px); }
.search-links a svg.i { color: var(--accent); }
.search-links a small { display: block; font: 11px var(--mono); color: var(--text-3); font-weight: 400; }

/* =========================================================
 * Questions
 * ======================================================= */
.q { border-radius: 14px; padding: 16px 18px; transition: border-color .3s; }
.q + .q { margin-top: 10px; }
.q::after { content: ''; position: absolute; left: 0; top: 14px; bottom: 14px; width: 2px; border-radius: 2px; background: transparent; transition: background .3s; }
.q.r0::after { background: var(--danger); }
.q.r1::after { background: var(--warn); }
.q.r2::after { background: var(--ok); }
.q-head { display: flex; gap: 12px; align-items: flex-start; }
.q-num { flex: none; font: 600 12px var(--mono); color: var(--text-3); padding-top: 3px; min-width: 22px; }
.q-text { flex: 1; font-size: 15px; font-weight: 500; }
.q-actions { display: flex; gap: 6px; flex-wrap: wrap; margin: 12px 0 0 34px; align-items: center; }
.q-actions .sep { width: 1px; height: 20px; background: var(--line-2); margin: 0 4px; }
.rate {
  height: 31px; padding: 0 12px; border-radius: 9px; border: 1px solid var(--line); background: var(--glass-2);
  font: 600 12px var(--mono); color: var(--text-2); transition: all .2s;
}
.rate:hover { border-color: var(--line-2); color: var(--text); }
.rate:active { transform: scale(.95); }
.rate.on.r0 { background: var(--danger); border-color: var(--danger); color: #fff; }
.rate.on.r1 { background: var(--warn); border-color: var(--warn); color: #1a1100; }
.rate.on.r2 { background: var(--ok); border-color: var(--ok); color: #03140a; }
.link-btn { display: inline-flex; align-items: center; gap: 6px; background: none; border: 0; color: var(--text-2); font: 600 12.5px var(--sans); padding: 4px 8px; border-radius: 8px; transition: color .2s, background .2s; }
.link-btn:hover { color: var(--accent); background: var(--accent-soft); }
.link-btn.on { color: var(--accent); }
.has-ans { font: 11px var(--mono); color: var(--accent); }
.collapse { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .35s var(--ease); }
.collapse > div { overflow: hidden; }
.collapse.open { grid-template-rows: 1fr; }
.answer { margin: 0 0 0 34px; }
.answer .pad { padding-top: 12px; }
textarea.ans {
  width: 100%; min-height: 110px; resize: vertical; border-radius: 12px; border: 1px solid var(--line-2);
  background: var(--glass-strong); padding: 12px 14px; font-size: 14px; line-height: 1.6; outline: none; transition: border-color .2s, box-shadow .2s;
}
textarea.ans:focus { border-color: var(--accent-line); box-shadow: 0 0 0 4px var(--accent-soft); }
.answer .faint { font-size: 12px; margin-top: 4px; }
.ref {
  margin-top: 12px; padding: 14px 16px; border-radius: 12px; border: 1px solid var(--accent-line);
  background: linear-gradient(180deg, var(--accent-soft), transparent 140%); font-size: 14px; line-height: 1.65;
}
.ref .lbl { display: flex; align-items: center; gap: 8px; font: 600 11px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); margin-bottom: 6px; }
.ref .tip { margin-top: 10px; font-size: 12.5px; color: var(--text-3); border-top: 1px dashed var(--line-2); padding-top: 8px; }
.q-summary { display: flex; gap: 14px; flex-wrap: wrap; font: 12px var(--mono); color: var(--text-2); }
.q-summary b { color: var(--text); }

/* Project */
.project { border-style: dashed; border-color: var(--accent-line); }
.project h3 { font-size: 20px; margin: 8px 0 8px; }

/* Pager */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 44px; }
.pager a { padding: 16px 18px; border-radius: 14px; color: var(--text); font-family: var(--display); font-weight: 500; transition: border-color .2s, transform .2s var(--ease); }
.pager a:hover { border-color: var(--accent-line); text-decoration: none; }
.pager a:not(.next):hover { transform: translateX(-3px); }
.pager a.next:hover { transform: translateX(3px); }
.pager .faint { font: 11.5px var(--mono); display: block; margin-bottom: 2px; }
.pager .next { text-align: right; grid-column: 2; }

/* =========================================================
 * Quiz
 * ======================================================= */
.quiz { max-width: 780px; margin: 0 auto; }
.quiz-card { padding: 30px; }
.quiz-card .qtext { font: 600 21px/1.4 var(--display); letter-spacing: -.015em; margin: 14px 0 18px; }
.quiz-bar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
.quiz-bar select { height: 40px; max-width: 100%; border-radius: 11px; border: 1px solid var(--line-2); background: var(--glass-strong); padding: 0 12px; font-size: 14px; }
.quiz-rates { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 16px; }
.quiz-rates .rate { height: 48px; font-size: 13px; }
.quiz-rates .rate.r0:hover { border-color: var(--danger); color: var(--danger); }
.quiz-rates .rate.r1:hover { border-color: var(--warn); color: var(--warn); }
.quiz-rates .rate.r2:hover { border-color: var(--ok); color: var(--ok); }
.quiz-card.flip { animation: flip .45s var(--ease) both; }
@keyframes flip { from { opacity: 0; transform: translateY(8px) scale(.985); } }

/* Tables */
.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th, .table td { text-align: left; padding: 11px 12px; border-bottom: 1px solid var(--line); }
.table th { font: 600 11px var(--mono); color: var(--text-3); text-transform: uppercase; letter-spacing: .08em; }
.table td.num { font-family: var(--mono); text-align: right; font-size: 13px; }
.table tr:last-child td { border-bottom: 0; }
.table-wrap { overflow-x: auto; }

/* Search */
.hit { display: block; padding: 15px 18px; border-radius: 14px; color: var(--text); transition: border-color .2s, transform .2s var(--ease); }
.hit + .hit { margin-top: 8px; }
.hit:hover { border-color: var(--accent-line); text-decoration: none; transform: translateX(3px); }
.hit .faint { font: 11.5px var(--mono); }
mark { background: color-mix(in srgb, var(--accent) 30%, transparent); color: inherit; border-radius: 3px; padding: 0 2px; }

/* Account / sync */
.account { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.avatar { width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--line-2); object-fit: cover; background: var(--glass-2); }
.setup { margin: 10px 0 0; padding-left: 20px; color: var(--text-2); font-size: 14px; display: grid; gap: 6px; }
pre.code { margin: 10px 0 0; padding: 12px 14px; border-radius: 10px; background: var(--glass-strong); border: 1px solid var(--line); font: 12.5px/1.6 var(--mono); overflow-x: auto; color: var(--text-2); }

/* Toast */
.toast {
  position: fixed; left: 50%; bottom: 26px; transform: translate(-50%, 20px); opacity: 0; pointer-events: none; z-index: 60;
  padding: 11px 18px; border-radius: 12px; font: 600 13px var(--mono); color: var(--text);
  background: var(--glass-strong); border: 1px solid var(--accent-line);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); box-shadow: var(--shadow); transition: .3s var(--ease);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* Google Translate: esconder a UI do widget */
.goog-te-banner-frame, .skiptranslate iframe, #goog-gt-tt, .goog-te-balloon-frame, .VIpgJd-ZVi9od-ORHb-OEVmcd, .VIpgJd-ZVi9od-aZ2wEe-wOHMyf { display: none !important; }
body { top: 0 !important; }
font { background: transparent !important; box-shadow: none !important; }
#gt-el { display: none; }

/* =========================================================
 * Responsive
 * ======================================================= */
@media (max-width: 1100px) {
  .ladder { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .g4 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .howto { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .menu-btn { display: inline-flex; }
  .layout { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; z-index: 40; left: 0; top: var(--topbar); bottom: 0; width: min(330px, 88vw); height: auto;
    transform: translateX(-102%); transition: transform .35s var(--ease); background: var(--glass-strong);
  }
  body.menu-open .sidebar { transform: none; }
  body.menu-open .scrim { display: block; position: fixed; inset: var(--topbar) 0 0 0; background: rgba(0,0,0,.45); z-index: 35; animation: fade .3s both; }
  @keyframes fade { from { opacity: 0; } }
  .g3 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .brand-text { display: none; }
  .search .kbd { display: none; }
  .main { padding-bottom: 110px; }
  .bottom-nav {
    display: grid; grid-template-columns: repeat(4, 1fr); position: fixed; z-index: 30; left: 12px; right: 12px; bottom: calc(12px + env(safe-area-inset-bottom));
    border-radius: 18px; padding: 6px; background: var(--glass-strong); border: 1px solid var(--line-2);
    -webkit-backdrop-filter: blur(18px) saturate(140%); backdrop-filter: blur(18px) saturate(140%); box-shadow: 0 18px 40px -16px rgba(0,0,0,.6);
  }
  .bottom-nav a, .bottom-nav button {
    display: flex; flex-direction: column; align-items: center; gap: 3px; padding: 7px 0; border: 0; background: none; border-radius: 12px;
    color: var(--text-3); font: 600 10.5px var(--mono); text-decoration: none;
  }
  .bottom-nav svg.i { width: 19px; height: 19px; }
  .bottom-nav .active { color: var(--accent); background: var(--accent-soft); }
}
@media (max-width: 640px) {
  :root { --topbar: 58px; }
  .main { padding: 22px 14px 110px; }
  .card { padding: 16px; border-radius: 14px; }
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .g4.stats { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .stat .v { font-size: 26px; }
  .ladder { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .page-head { flex-direction: column; gap: 4px; }
  .page-head .ring { display: none; }
  .q { padding: 14px; }
  .q-actions, .answer { margin-left: 0; }
  .q-actions .sep { display: none; }
  .checklist label { padding: 8px 4px; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { grid-column: 1; }
  .quiz-card { padding: 18px; }
  .quiz-card .qtext { font-size: 18px; }
  .topbar { gap: 8px; padding: 0 12px; }
  .search-links { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
  .term .s { display: none; }
  .topic-card .idx { width: 38px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
@media print {
  .topbar, .sidebar, .q-actions, .pager, .bottom-nav, .orbs { display: none !important; }
  .layout { display: block; }
  .collapse { grid-template-rows: 1fr !important; }
}