/* Layout: app de estudo. Cabeçalho fixo com busca, páginas por rota (#viagem, #praticar),
   cartões de frase em coluna única e larga para leitura confortável no celular. */
:root {
  --bg: #f2f5f8;
  --surface: #ffffff;
  --surface-2: #e8eef3;
  --ink: #101c26;
  --muted: #55636f;
  --line: #d5dee5;
  --accent: #0b5cad;
  --accent-ink: #ffffff;
  --accent-soft: #e2edf8;
  --mark: #ffd84d;
  --ok: #1f7a4d;
  --star: #c98a00;
  --tray: #dfe5ea;
  --chip-on: #f3cdb8;
  --chip-cur: #ffffff;
  --chip-off: #eef2f5;
  --chip-ink: #101c26;
  --chip-edge: #7a5a48;
  --chip-edge-off: #c3ccd3;
  --shadow: 0 1px 2px rgb(16 28 38 / .06), 0 4px 14px rgb(16 28 38 / .05);
  --font-display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --font-body: "Atkinson Hyperlegible", "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  --radius: 14px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0c141b; --surface: #142029; --surface-2: #1b2a35; --ink: #e5edf3; --muted: #94a6b4;
    --line: #253543; --accent: #6db3ff; --accent-ink: #06111b; --accent-soft: #16304a;
    --mark: #d9b52c; --ok: #5fd39a; --star: #f0c040; --shadow: none;
    --tray: #1f2d38; --chip-on: #8a5a42; --chip-cur: #e9eef2; --chip-off: #1a2731; --chip-ink: #ffffff; --chip-edge: #3d271c; --chip-edge-off: #0d151c;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0c141b; --surface: #142029; --surface-2: #1b2a35; --ink: #e5edf3; --muted: #94a6b4;
  --line: #253543; --accent: #6db3ff; --accent-ink: #06111b; --accent-soft: #16304a;
  --mark: #d9b52c; --ok: #5fd39a; --star: #f0c040; --shadow: none;
    --tray: #1f2d38; --chip-on: #8a5a42; --chip-cur: #e9eef2; --chip-off: #1a2731; --chip-ink: #ffffff; --chip-edge: #3d271c; --chip-edge-off: #0d151c;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 140px; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.55 var(--font-body); }
button { font: inherit; color: inherit; }
a { color: var(--accent); }
.wrap {
  max-width: 920px; margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

/* ---------- cabeçalho ---------- */
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 30; background: var(--surface); }
.site-header {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
  background: var(--surface); border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; gap: 12px 18px; padding-block: 10px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font: 800 18px/1 var(--font-display); letter-spacing: -.01em; }
.brand svg { width: 34px; height: 34px; flex: none; }
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a {
  text-decoration: none; color: var(--muted); font-weight: 700; font-size: 15px;
  padding: 7px 12px; border-radius: 999px; white-space: nowrap;
}
.nav a:hover { color: var(--ink); background: var(--surface-2); }
.nav a[aria-current="page"] { color: var(--accent-ink); background: var(--accent); }
.nav .count { font: 500 12px var(--font-mono); margin-left: 4px; opacity: .8; }
.search-box { position: relative; flex: 1 1 260px; min-width: 0; order: 3; }
.search-box svg { position: absolute; left: 12px; top: 50%; translate: 0 -50%; width: 18px; height: 18px; stroke: var(--muted); fill: none; stroke-width: 2; }
.search {
  width: 100%; font: inherit; font-size: 16px; color: var(--ink);
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 9px 12px 9px 38px;
}
@media (max-width: 520px) {
  .brand span { display: none; }
  .nav { gap: 2px; }
  .nav a { padding: 6px 8px; font-size: 14px; }
}
@media (min-width: 760px) {
  .search-box { order: 0; flex: 0 1 300px; margin-left: auto; }
  .nav { margin-left: 0; }
}

/* ---------- tipografia ---------- */
h1, h2, h3 { font-family: var(--font-display); text-wrap: balance; margin: 0; }
.eyebrow { font: 500 12px/1.2 var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.hl { background: linear-gradient(transparent 62%, var(--mark) 62%); padding: 0 .08em; }
.lede { color: var(--muted); max-width: 60ch; margin: 0; font-size: 18px; }

main { padding-block: 28px 72px; min-height: 60vh; }
.view { display: grid; gap: 32px; }

/* ---------- início ---------- */
.hero { display: grid; gap: 16px; padding-block: 16px 4px; }
.hero h1 { font-weight: 800; font-size: clamp(36px, 7vw, 64px); line-height: 1.02; letter-spacing: -.025em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 4px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer; text-decoration: none;
  font-weight: 700; font-size: 16px; border-radius: 10px; padding: 11px 18px;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn:hover { filter: brightness(1.05); }
.btn svg { width: 18px; height: 18px; fill: currentColor; }
.stats { display: flex; flex-wrap: wrap; gap: 8px 28px; padding-top: 4px; }
.stat { display: grid; }
.stat b { font: 800 28px/1.1 var(--font-display); font-variant-numeric: tabular-nums; }
.stat span { font-size: 14px; color: var(--muted); }

.daily {
  display: grid; grid-template-columns: 1fr auto; gap: 6px 16px; align-items: center;
  background: var(--accent-soft); border-radius: var(--radius); padding: 20px 22px;
}
.daily .eyebrow { grid-column: 1 / -1; color: var(--accent); }
.daily .en { font-size: clamp(22px, 4vw, 28px); }

.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.section-head h2 { font-size: 26px; font-weight: 600; }
.topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.topic-card {
  display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; align-content: start;
  text-decoration: none; color: var(--ink); background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow);
}
.topic-card:hover { border-color: var(--tc); }
.topic-card h3 { font-size: 21px; font-weight: 600; align-self: center; }
.topic-card p { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 15px; }
.topic-card .meta { grid-column: 1 / -1; display: flex; justify-content: space-between; font: 500 12px var(--font-mono); color: var(--muted); margin-top: 6px; }
.ticon { width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center; background: var(--tc); color: #fff; }
.ticon svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.bar { grid-column: 1 / -1; height: 6px; border-radius: 99px; background: var(--surface-2); overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--ok); border-radius: inherit; }

.method { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.method div { border-top: 3px solid var(--ink); padding-top: 12px; }
.method b { font: 600 19px var(--font-display); display: block; margin-bottom: 4px; }
.method span { font-size: 15px; color: var(--muted); }
.method .n { font: 500 12px var(--font-mono); color: var(--muted); display: block; margin-bottom: 6px; }

/* ---------- página de tópico ---------- */
.crumb { font-size: 15px; text-decoration: none; color: var(--muted); display: inline-flex; gap: 6px; align-items: center; }
.crumb:hover { color: var(--ink); }
.topic-head { display: grid; gap: 12px; }
.topic-head .title { display: flex; align-items: center; gap: 14px; }
.topic-head h1 { font-size: clamp(32px, 6vw, 48px); font-weight: 800; letter-spacing: -.02em; }
.topic-head .ticon { width: 52px; height: 52px; border-radius: 13px; }
.topic-head .ticon svg { width: 26px; height: 26px; }
.progress-line { display: flex; align-items: center; gap: 12px; font: 500 13px var(--font-mono); color: var(--muted); }
.progress-line .bar { flex: 1; max-width: 280px; }

.toolbar { background: var(--bg); padding-block: 10px; margin-block: -10px; display: grid; gap: 10px; border-bottom: 1px solid var(--line); }
@media (min-width: 760px) {
  .toolbar { position: sticky; top: calc(env(safe-area-inset-top, 0px) + var(--header-h, 58px)); z-index: 10; }
}
.tools { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.toggle {
  font-weight: 700; font-size: 14px; background: var(--surface); cursor: pointer;
  border: 1px solid var(--line); border-radius: 999px; padding: 7px 14px;
}
.toggle[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.speed { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; background: var(--surface); }
.speed button { border: 0; background: none; padding: 7px 11px; font: 500 13px var(--font-mono); cursor: pointer; color: var(--muted); }
.speed button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
.chips { display: flex; gap: 6px; overflow-x: auto; scrollbar-width: thin; padding-bottom: 2px; }
.chip {
  flex: 0 0 auto; font-weight: 600; font-size: 14px; color: var(--muted); background: transparent; white-space: nowrap;
  border: 1px solid var(--line); border-radius: 999px; padding: 5px 12px; cursor: pointer;
}
.chip:hover { color: var(--ink); border-color: var(--muted); }

.group { display: grid; gap: 10px; }
.group h2 { font-size: 22px; font-weight: 600; display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.group h2 small { font: 400 15px var(--font-body); color: var(--muted); }

/* ---------- cartão de frase ---------- */
.card {
  display: grid; grid-template-columns: 1fr auto; gap: 4px 14px; align-items: start;
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px;
}
.txt { min-width: 0; display: grid; gap: 2px; }
.en { font: 700 20px/1.3 var(--font-body); margin: 0; overflow-wrap: anywhere; }
.pt { margin: 0; }
.pron { margin: 0; font: 400 14px/1.45 var(--font-mono); color: var(--muted); overflow-wrap: anywhere; }
.pron b { font-weight: 500; color: var(--accent); }
.tip { margin: 6px 0 0; font-size: 14px; color: var(--muted); padding-left: 10px; border-left: 2px solid var(--mark); }
.where { font: 500 12px var(--font-mono); color: var(--muted); margin: 0 0 2px; text-transform: uppercase; letter-spacing: .08em; }
.actions { display: flex; gap: 6px; }
.icon-btn {
  width: 42px; height: 42px; border-radius: 50%; display: grid; place-items: center; cursor: pointer; flex: none;
  border: 1px solid var(--line); background: var(--surface); color: var(--muted);
}
.icon-btn:hover { color: var(--ink); border-color: var(--muted); }
.icon-btn.play { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.icon-btn svg { width: 18px; height: 18px; fill: currentColor; }
.icon-btn.fav[aria-pressed="true"] { color: var(--star); border-color: var(--star); }
.icon-btn.learn[aria-pressed="true"] { color: var(--ok); border-color: var(--ok); }
.card.learned .en { text-decoration: line-through; text-decoration-color: var(--ok); text-decoration-thickness: 2px; }
.card.learned { background: var(--surface-2); }
.card.playing { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent); }

body.quiz .card:not(.revealed) .en,
body.quiz .card:not(.revealed) .pron { filter: blur(7px); user-select: none; }
body.quiz .card:not(.revealed) .txt { cursor: pointer; }
body.quiz .card .pt { order: -1; font-weight: 700; }

@media (max-width: 560px) {
  .card { grid-template-columns: 1fr; padding: 12px 14px; }
  .actions { justify-content: flex-end; }
  .en { font-size: 18px; }
  .icon-btn { width: 40px; height: 40px; }
}

/* ---------- blocos de palavras ---------- */
.blocks-row {
  display: none; flex-wrap: wrap; gap: 6px 6px; align-items: flex-start; justify-self: start;
  background: var(--tray); border-radius: 14px; padding: 7px 7px 5px; margin-top: 4px; max-width: 100%;
}
.card .blocks-row, .line .blocks-row { display: flex; }
.card .en, .card .pron { display: none; }
.blk { display: grid; justify-items: center; gap: 3px; min-width: 0; }
.blk .w {
  display: block; font: 700 19px/1.2 var(--font-body); padding: 7px 12px 8px; border-radius: 10px;
  background: var(--chip-on); color: var(--chip-ink); box-shadow: 0 3px 0 var(--chip-edge); white-space: nowrap; cursor: pointer;
}
.blk small { font: 400 14px/1.2 var(--font-mono); color: var(--muted); white-space: nowrap; }
.blk small b { color: var(--accent); font-weight: 500; }
.blk.cur .w { background: var(--chip-cur); color: #101c26; }
.blk.off .w { background: var(--chip-off); box-shadow: 0 3px 0 var(--chip-edge-off); cursor: default; }
.sep { align-self: center; color: var(--muted); font-weight: 700; padding: 0 2px 18px; }
body.quiz .line:not(.revealed) .blocks-row .w,
body.quiz .line:not(.revealed) .blocks-row small,
body.quiz .card:not(.revealed) .blocks-row .w,
body.quiz .card:not(.revealed) .blocks-row small { filter: blur(6px); }

.stage {
  background: var(--surface); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow);
  padding: 28px 20px 24px; display: grid; gap: 18px; justify-items: center; text-align: center; cursor: pointer;
  -webkit-tap-highlight-color: transparent; user-select: none;
}
.stage .q { font: 700 clamp(24px, 5vw, 34px)/1.25 var(--font-display); text-wrap: balance; }
.stage .blocks-row { display: flex; justify-content: center; justify-self: center; padding: 9px 9px 7px; gap: 8px; }
.stage .blk .w { font-size: clamp(20px, 4.4vw, 28px); padding: 9px 16px 10px; }
.stage .blk small { font-size: 15px; }
.stage .tip { text-align: left; }
.stage-actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.btn[disabled] { opacity: .45; cursor: default; }
.kbd { font: 500 11px var(--font-mono); border: 1px solid currentColor; border-radius: 5px; padding: 1px 5px; opacity: .75; }
@media (hover: none) { .kbd { display: none; } }

/* ---------- abas do tópico ---------- */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); }
.tab {
  background: none; border: 0; border-bottom: 3px solid transparent; margin-bottom: -1px; cursor: pointer;
  padding: 10px 14px; font: 600 18px var(--font-display); color: var(--muted);
}
.tab span { font: 500 12px var(--font-mono); margin-left: 4px; }
.tab:hover { color: var(--ink); }
.tab[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--accent); }
.hint { margin: 0; font-size: 15px; color: var(--muted); max-width: 70ch; }

/* ---------- diálogos ---------- */
.dialogue { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; display: grid; gap: 20px; }
.dialogue header { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.dialogue h3 { font-size: 19px; font-weight: 600; }
.line { display: grid; grid-template-columns: 32px 1fr; gap: 10px; align-items: start; cursor: pointer; border-radius: 10px; padding: 6px; margin: -6px; }
.line:hover { background: var(--surface-2); }
.line.playing { background: var(--accent-soft); }
.who { width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; font: 500 13px var(--font-mono); background: var(--surface-2); color: var(--muted); }
.line.me .who { background: var(--accent); color: var(--accent-ink); }
.line p { margin: 0; }
.line-body { min-width: 0; display: grid; gap: 4px; }
.line .blk .w { font-size: 17px; padding: 5px 10px 6px; }
.line .blk small { font-size: 13px; }
.line .l-pt { color: var(--muted); font-size: 15px; }
.line .l-pt { color: var(--ink); font-size: 16px; }
.line.me .l-pt { font-weight: 700; }

/* ---------- praticar ---------- */
.practice { display: grid; gap: 18px; max-width: 640px; }
.select { font: inherit; font-size: 16px; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 9px 12px; max-width: 100%; }
.flash {
  background: var(--surface); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow);
  padding: 28px 24px; display: grid; gap: 14px; min-height: 260px; align-content: center; text-align: center;
}
.flash .q { font: 700 clamp(24px, 5vw, 32px)/1.25 var(--font-display); }
.flash .a { display: grid; gap: 6px; }
.flash .a .en { font-size: clamp(22px, 4.5vw, 28px); }
.flash .row { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.flash-meta { display: flex; justify-content: space-between; font: 500 13px var(--font-mono); color: var(--muted); }

.empty { color: var(--muted); padding: 32px 0; }
.note { font-size: 14px; color: var(--muted); max-width: 70ch; }

/* ---------- rodapé ---------- */
.site-footer { border-top: 1px solid var(--line); padding-block: 24px 40px; font-size: 14px; color: var(--muted); }
.site-footer .wrap { display: flex; gap: 8px 24px; flex-wrap: wrap; justify-content: space-between; }
.link-btn { background: none; border: 0; padding: 0; color: var(--muted); text-decoration: underline; cursor: pointer; font-size: 14px; }

@media (prefers-reduced-motion: no-preference) {
  .icon-btn, .btn { transition: transform .12s, filter .12s; }
  .icon-btn:active, .btn:active { transform: scale(.95); }
  body.quiz .card .en, body.quiz .card .pron { transition: filter .2s; }
}