/* Painel de Estudo — CSS à mão, sem framework, sem build.
   Mobile-first: as regras base são as do telemóvel; a sidebar só aparece a partir dos 900px. */

:root {
  --bg: #0d0f12;
  --bg-2: #12151a;
  --bg-3: #181c23;
  --line: #232831;
  --line-2: #2e3541;
  --txt: #e6e9ef;
  --txt-2: #98a1b0;
  --txt-3: #6a7382;
  --accent: #5b8cff;
  --ok: #3fae7d;
  --warn: #e0a13c;
  --bad: #e0605f;
  --radius: 8px;
  --sp: 8px;
  --fs: 15px;
  --shadow: 0 8px 28px rgba(0, 0, 0, .45);
}

:root[data-theme="light"] {
  --bg: #f6f7f9;
  --bg-2: #ffffff;
  --bg-3: #eef0f4;
  --line: #dde1e8;
  --line-2: #c9d0da;
  --txt: #171a1f;
  --txt-2: #5b6472;
  --txt-3: #838c9a;
  --shadow: 0 8px 24px rgba(15, 20, 30, .12);
}

/* Primeira visita sem preferência guardada: segue o sistema. */
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --bg: #f6f7f9;
    --bg-2: #ffffff;
    --bg-3: #eef0f4;
    --line: #dde1e8;
    --line-2: #c9d0da;
    --txt: #171a1f;
    --txt-2: #5b6472;
    --txt-3: #838c9a;
    --shadow: 0 8px 24px rgba(15, 20, 30, .12);
  }
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--txt);
  font: var(--fs)/1.45 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  -webkit-text-size-adjust: 100%;
  overflow-wrap: break-word;
}

h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -.01em; }
h1 { font-size: 1.15rem; }
h2 { font-size: .95rem; }
h3 { font-size: .85rem; }
p { margin: 0 0 var(--sp); }

a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible,
textarea:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.num, table, .stat-value, .grade, time { font-variant-numeric: tabular-nums; }

.ico { flex: none; }

/* ---------- Esqueleto ---------- */

.app { min-height: 100dvh; }

.side { display: none; }

.main {
  padding: 0 12px calc(72px + env(safe-area-inset-bottom));
  max-width: 1180px;
}

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: var(--sp);
  padding: 10px 0;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  margin-bottom: 12px;
}
.top h1 { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.top-actions { display: flex; gap: 6px; align-items: center; }
.top-menu { display: inline-flex; padding: 6px; color: var(--txt-2); }

/* ---------- Navegação ---------- */

.nav { display: flex; flex-direction: column; gap: 1px; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 10px;
  border-radius: 6px;
  color: var(--txt-2);
  font-size: .875rem;
  line-height: 1.2;
}
.nav-link:hover { background: var(--bg-3); color: var(--txt); }
.nav-link.is-active { background: var(--bg-3); color: var(--txt); box-shadow: inset 2px 0 0 var(--accent); }

.tabbar {
  position: fixed;
  inset: auto 0 0 0;
  z-index: 30;
  display: flex;
  justify-content: space-around;
  gap: 2px;
  padding: 6px 4px calc(6px + env(safe-area-inset-bottom));
  background: color-mix(in srgb, var(--bg-2) 96%, transparent);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
}
.tabbar .nav-link {
  flex-direction: column;
  gap: 2px;
  font-size: .65rem;
  padding: 4px 6px;
  box-shadow: none;
  flex: 1;
  justify-content: center;
  text-align: center;
}
.tabbar .nav-link.is-active { color: var(--accent); background: transparent; }

/* Menu mobile sem JS: :target abre a folha. */
.sheet { display: none; }
.sheet:target { display: block; position: fixed; inset: 0; z-index: 50; }
.sheet-backdrop { position: absolute; inset: 0; background: rgba(0, 0, 0, .5); }
.sheet-body {
  position: absolute;
  inset: auto 0 0 0;
  max-height: 82dvh;
  overflow: auto;
  background: var(--bg-2);
  border-top: 1px solid var(--line);
  border-radius: 14px 14px 0 0;
  padding: 12px 12px calc(12px + env(safe-area-inset-bottom));
}
.sheet-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--sp); }
.sheet-foot { display: flex; gap: var(--sp); margin-top: 12px; border-top: 1px solid var(--line); padding-top: 12px; }

.brand { display: flex; align-items: center; gap: var(--sp); font-weight: 600; padding: 2px 4px 14px; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 24px; height: 24px;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: .8rem;
}

/* ---------- Blocos ---------- */

.cards { display: grid; gap: 10px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .cards.c2 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 980px) { .cards.c3 { grid-template-columns: repeat(3, 1fr); } }

.card {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
}
.card-head {
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp);
  margin: -2px 0 var(--sp);
}
.card-head h2 { color: var(--txt-2); font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; }
.card-head a { color: var(--txt-3); font-size: .75rem; }
.card-head a:hover { color: var(--txt); }

.stat { display: flex; flex-direction: column; gap: 2px; }
.stat-value { font-size: 1.5rem; font-weight: 600; line-height: 1.1; }
.stat-label { color: var(--txt-3); font-size: .72rem; text-transform: uppercase; letter-spacing: .05em; }
.stat-sub { color: var(--txt-2); font-size: .78rem; }

.statline { display: flex; gap: 18px; flex-wrap: wrap; }

/* ---------- Listas ---------- */

.rows { display: flex; flex-direction: column; }
.row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  font-size: .88rem;
}
.row:last-child { border-bottom: 0; }
.row-main { flex: 1; min-width: 0; }
.row-title { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row-sub { color: var(--txt-3); font-size: .75rem; }
.row-end { color: var(--txt-2); font-size: .8rem; white-space: nowrap; }

.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); flex: none; }
.bar-accent { border-left: 3px solid var(--accent); padding-left: 9px; }

.empty { color: var(--txt-3); font-size: .85rem; padding: 10px 0; }

/* ---------- Tabelas ---------- */

.table { width: 100%; border-collapse: collapse; font-size: .85rem; }
.table th {
  text-align: left;
  color: var(--txt-3);
  font-weight: 500;
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .05em;
  padding: 6px 8px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.table td { padding: 7px 8px; border-bottom: 1px solid var(--line); }
.table tr:last-child td { border-bottom: 0; }
.table .r { text-align: right; }
.table-wrap { overflow-x: auto; margin: 0 -12px; padding: 0 12px; }

.kv td { padding: 4px 10px 4px 0; font-size: .85rem; }
.kv td:first-child { color: var(--txt-3); white-space: nowrap; }

/* ---------- Controlos ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 11px;
  border: 1px solid var(--line-2);
  border-radius: 6px;
  background: var(--bg-3);
  color: var(--txt);
  font: inherit;
  font-size: .82rem;
  cursor: pointer;
  transition: background .12s ease, border-color .12s ease;
}
.btn:hover { background: var(--line); }
.btn-primary { background: var(--accent); border-color: transparent; color: #fff; }
.btn-primary:hover { filter: brightness(1.08); background: var(--accent); }
.btn-ghost { background: transparent; border-color: transparent; color: var(--txt-2); }
.btn-ghost:hover { background: var(--bg-3); color: var(--txt); }
.btn-danger { color: var(--bad); border-color: transparent; background: transparent; }
.btn-danger:hover { background: color-mix(in srgb, var(--bad) 15%, transparent); }
.btn-sm { padding: 4px 8px; font-size: .75rem; }

.field { display: flex; flex-direction: column; gap: 4px; margin-bottom: 10px; }
.field > label { color: var(--txt-2); font-size: .75rem; text-transform: uppercase; letter-spacing: .05em; }
.field .hint { color: var(--txt-3); font-size: .74rem; }

input[type=text], input[type=password], input[type=number], input[type=date], input[type=time],
input[type=url], input[type=search], select, textarea {
  width: 100%;
  padding: 8px 10px;
  background: var(--bg);
  border: 1px solid var(--line-2);
  border-radius: 6px;
  color: var(--txt);
  font: inherit;
  font-size: .88rem;
}
input[type=color] {
  width: 44px; height: 34px; padding: 2px;
  background: var(--bg); border: 1px solid var(--line-2); border-radius: 6px;
}
textarea { min-height: 90px; resize: vertical; }
select { appearance: none; background-image: none; }

.form-grid { display: grid; gap: 0 12px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .form-grid.g2 { grid-template-columns: 1fr 1fr; } }
@media (min-width: 640px) { .form-grid.g3 { grid-template-columns: repeat(3, 1fr); } }
.form-actions { display: flex; gap: var(--sp); align-items: center; margin-top: 6px; }
.spacer { flex: 1; }

.inline { display: inline; }

/* ---------- Chips e badges ---------- */

.chip {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 2px 8px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  font-size: .72rem;
  color: var(--txt-2);
  white-space: nowrap;
}
.chip-accent { border-color: color-mix(in srgb, var(--accent) 55%, transparent); color: var(--accent); }

.badge { font-size: .72rem; padding: 1px 6px; border-radius: 4px; background: var(--bg-3); color: var(--txt-2); }
.badge-ok { color: var(--ok); background: color-mix(in srgb, var(--ok) 14%, transparent); }
.badge-warn { color: var(--warn); background: color-mix(in srgb, var(--warn) 14%, transparent); }
.badge-bad { color: var(--bad); background: color-mix(in srgb, var(--bad) 14%, transparent); }

.grade { font-weight: 600; }
.grade-bad { color: var(--bad); }
.grade-mid { color: var(--warn); }
.grade-ok { color: var(--ok); }

.flashes { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.flash { padding: 8px 10px; border-radius: 6px; font-size: .85rem; border: 1px solid var(--line-2); background: var(--bg-2); }
.flash-ok { border-color: color-mix(in srgb, var(--ok) 45%, transparent); color: var(--ok); }
.flash-erro { border-color: color-mix(in srgb, var(--bad) 45%, transparent); color: var(--bad); }

kbd {
  font: inherit; font-size: .72rem;
  padding: 1px 5px;
  border: 1px solid var(--line-2);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--bg-3);
}

.dlg {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg-2);
  color: var(--txt);
  padding: 16px;
  box-shadow: var(--shadow);
  max-width: 320px;
}
.dlg::backdrop { background: rgba(0, 0, 0, .5); }
.dlg h2 { margin-bottom: var(--sp); }
.dlg .btn { margin-top: 12px; }

/* ---------- Login ---------- */

.login-wrap { display: grid; place-items: center; min-height: 100dvh; padding: 16px; }
.login-box { width: 100%; max-width: 320px; }
.login-box .card { padding: 18px; }
.login-title { text-align: center; margin-bottom: 14px; }
.login-title .brand-mark { width: 34px; height: 34px; margin: 0 auto 8px; font-size: 1rem; }

/* ---------- Gráficos ---------- */

.chart { display: block; width: 100%; height: auto; }
.chart-grid { stroke: var(--line); stroke-width: 1; }
.chart-line { fill: none; stroke: var(--accent); stroke-width: 2; }
.chart-dot { fill: var(--accent); }
.chart-label { fill: var(--txt-3); font-size: 10px; }
.chart-bar { fill: var(--accent); }

/* ---------- Desktop ---------- */

@media (min-width: 900px) {
  .app { display: grid; grid-template-columns: 208px minmax(0, 1fr); }
  .side {
    display: flex;
    flex-direction: column;
    gap: var(--sp);
    position: sticky;
    top: 0;
    height: 100dvh;
    padding: 14px 10px;
    border-right: 1px solid var(--line);
    background: var(--bg-2);
  }
  .side .nav { flex: 1; overflow-y: auto; }
  .side-foot { display: flex; flex-direction: column; gap: 2px; border-top: 1px solid var(--line); padding-top: var(--sp); }
  .side-foot .btn { justify-content: flex-start; width: 100%; }
  .main { padding: 0 20px 40px; }
  .top { padding: 14px 0 10px; }
  .top-menu { display: none; }
  .tabbar { display: none; }
  .table-wrap { margin: 0; padding: 0; }
}

/* O toggle mostra o ícone do tema para onde se vai, não o atual: sol no escuro. */
[data-theme-toggle] .ico:nth-of-type(2) { display: none; }
:root[data-theme="light"] [data-theme-toggle] .ico:nth-of-type(1) { display: none; }
:root[data-theme="light"] [data-theme-toggle] .ico:nth-of-type(2) { display: inline; }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ---------- Texto gerado (resumos, apontamentos, cartões) ---------- */

.prose { font-size: .92rem; line-height: 1.6; }
.prose h2, .prose h3, .prose h4 { margin: 14px 0 6px; }
.prose h2 { font-size: 1rem; }
.prose h3 { font-size: .9rem; color: var(--txt-2); }
.prose p { margin: 0 0 8px; }
.prose ul, .prose ol { margin: 0 0 8px; padding-left: 20px; }
.prose li { margin-bottom: 3px; }
.prose strong { color: var(--txt); }
.prose code, .code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .85em;
  background: var(--bg-3);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 4px;
}
.prose pre.code {
  display: block;
  padding: 10px;
  overflow-x: auto;
  white-space: pre;
}
.prose pre.code code { background: none; border: 0; padding: 0; }

/* ---------- Revisão de cartões ---------- */

.card-face {
  font-size: 1.05rem;
  line-height: 1.5;
  padding: 22px 4px;
  text-align: center;
  border-left: 3px solid var(--accent);
  padding-left: 14px;
  text-align: left;
}
.card-face p { margin: 0 0 6px; }
.card-back { color: var(--txt-2); border-left-color: var(--line-2); }
.sep { border: 0; border-top: 1px solid var(--line); margin: 4px 0; }

.btn-wide { width: 100%; justify-content: center; }

.grade-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin-top: 12px; }
.grade-row .btn {
  flex-direction: column;
  gap: 1px;
  width: 100%;
  justify-content: center;
  padding: 10px 4px;
  font-size: .78rem;
}
.grade-row .row-sub { font-size: .68rem; }

input[type=file] { font-size: .82rem; color: var(--txt-2); }
input[type=checkbox] { width: 18px; height: 18px; accent-color: var(--accent); }