/* Programming Day by Day — estilos
   Tokens no :root, tema escuro por prefers-color-scheme, sem fontes externas. */

:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --text: #1c2128;
  --muted: #5d6673;
  --border: #dde1e6;
  --accent: #2f63a8;
  --code-bg: #0f1419;
  --code-text: #e6e1cf;
  --shadow: 0 1px 2px rgb(0 0 0 / .04), 0 4px 16px rgb(0 0 0 / .05);
  --lang: #2f63a8;
  --radius: 14px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "JetBrains Mono", "Cascadia Code", "SF Mono", Menlo, Consolas, monospace;

  --easy: #1e7a2e;
  --medium: #9c5a12;
  --hard: #b0305c;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --surface: #161b22;
    --surface-2: #1c222b;
    --text: #e6edf3;
    --muted: #9aa5b1;
    --border: #2a313c;
    --accent: #6ea8fe;
    --code-bg: #0a0d12;
    --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 8px 24px rgb(0 0 0 / .25);
    --easy: #4cc26a;
    --medium: #e3a346;
    --hard: #f07aa3;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--font);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main { flex: 1; padding-block: 28px 56px; }

a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }

h1, h2, h3 { line-height: 1.25; margin: 0 0 .5em; }
p { margin: 0 0 1em; }

.wrap { width: min(1120px, 100% - 32px); margin-inline: auto; }
.mono { font-family: var(--mono); }
.muted { color: var(--muted); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------- cabeçalho e rodapé ---------- */

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 64px; flex-wrap: wrap;
}
.logo {
  display: inline-flex; align-items: center; gap: 10px;
  color: var(--text); text-decoration: none; font-weight: 700; letter-spacing: -.01em;
}
.logo-prompt {
  font-family: var(--mono); font-weight: 700;
  background: var(--code-bg); color: #7ee787;
  padding: 2px 8px; border-radius: 8px;
}
.main-nav { display: flex; gap: 4px; }
.main-nav a {
  color: var(--muted); text-decoration: none; font-weight: 500;
  padding: 8px 12px; border-radius: 10px;
}
.main-nav a:hover { color: var(--text); background: var(--surface-2); }
.main-nav a[aria-current="page"] { color: var(--text); background: var(--surface-2); }

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  font-size: .9rem;
}
.footer-inner { padding-block: 20px; }
.footer-inner p { margin: .25em 0; }

/* ---------- elementos comuns ---------- */

.button {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--text); color: var(--surface);
  border: 1px solid var(--text); border-radius: 10px;
  padding: 8px 16px; font: inherit; font-weight: 600; font-size: .95rem;
  text-decoration: none; cursor: pointer; white-space: nowrap;
}
.button:hover { opacity: .88; }
.button-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.button-ghost:hover { background: var(--surface-2); opacity: 1; }

.badge {
  display: inline-block; font-size: .75rem; font-weight: 600;
  padding: 2px 8px; border-radius: 999px;
  border: 1px solid var(--border); color: var(--muted); background: var(--surface);
}
.diff-facil   { color: var(--easy);   border-color: currentColor; }
.diff-medio   { color: var(--medium); border-color: currentColor; }
.diff-desafio { color: var(--hard);   border-color: currentColor; }

.dot {
  display: inline-block; width: 9px; height: 9px; border-radius: 50%;
  background: var(--lang); flex: none;
}
.lang-tag {
  display: inline-flex; align-items: center; gap: 6px; font-weight: 600;
}

.small-title {
  font-size: .8rem; text-transform: uppercase; letter-spacing: .08em;
  color: var(--muted); margin: 1.6em 0 .6em;
}
.section-title { font-size: 1.25rem; margin: 40px 0 16px; }

.breadcrumb {
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
  font-size: .9rem; color: var(--muted); margin-bottom: 16px;
}
.breadcrumb a { color: var(--muted); }

.page-head { margin-bottom: 24px; }
.page-head h1 { font-size: 2rem; letter-spacing: -.02em; }

/* ---------- faixa de linguagens ---------- */

.lang-strip, .filter-chips {
  display: flex; gap: 8px; flex-wrap: wrap; margin: 0 0 24px;
}
.lang-chip {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 6px 12px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--text); text-decoration: none; font-size: .9rem; font-weight: 500;
}
.lang-chip:hover { border-color: var(--lang); }
.lang-chip.is-current {
  background: var(--lang); border-color: var(--lang); color: #fff;
}
.lang-chip.is-current .dot { background: #fff; }

/* ---------- card do dia ---------- */

.card-head {
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: 16px; flex-wrap: wrap; margin-bottom: 20px;
}
.card-when { display: flex; flex-direction: column; gap: 2px; }
.card-number { font-size: .85rem; color: var(--muted); }
.card-when time { font-size: 1.15rem; font-weight: 600; }
.back-today { font-size: .9rem; }
.day-nav { display: flex; gap: 8px; }
.day-nav a, .day-nav span {
  padding: 8px 14px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); text-decoration: none; color: var(--text); font-weight: 500;
}
.day-nav a:hover { background: var(--surface-2); }
.day-nav .is-disabled { color: var(--muted); opacity: .5; cursor: not-allowed; }

.card {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  background: var(--surface); border: 1px solid var(--border);
  border-top: 4px solid var(--lang);
  border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden;
}
.card-body { padding: 28px 32px; }
.card-code {
  background: var(--code-bg); padding: 20px; display: flex; flex-direction: column;
  min-width: 0;
}
.card-code .code-block { flex: 1; margin: 0; border: 0; }
.card-kicker {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  font-size: .9rem; color: var(--muted); margin-bottom: 12px;
}
.card-kicker .lang-tag { color: var(--lang); }
.card-title { font-size: clamp(1.6rem, 3vw, 2.2rem); letter-spacing: -.02em; }
.card-summary p:last-child { margin-bottom: 0; }

.key-points { padding-left: 1.2em; margin: 0; }
.key-points li { margin-bottom: .45em; }
.key-points li::marker { color: var(--lang); }
.key-points.compact { font-size: .9rem; margin-bottom: 16px; }

/* ---------- código ---------- */

.code-block {
  position: relative; margin: 0 0 16px;
  background: var(--code-bg); color: var(--code-text);
  border-radius: 10px; border: 1px solid var(--border); overflow: hidden;
}
.code-name {
  font-size: .8rem; color: #8b949e; padding: 10px 16px;
  border-bottom: 1px solid rgb(255 255 255 / .08);
}
pre {
  margin: 0; padding: 16px; overflow-x: auto;
  font: .9rem/1.55 var(--mono); tab-size: 4;
}
code { font-family: var(--mono); }
:not(pre) > code {
  font-size: .88em; background: var(--surface-2); padding: .1em .35em; border-radius: 5px;
}
.copy-button {
  position: absolute; top: 8px; right: 8px;
  font: 600 .75rem var(--font); color: #c9d1d9;
  background: rgb(255 255 255 / .08); border: 1px solid rgb(255 255 255 / .15);
  border-radius: 7px; padding: 4px 10px; cursor: pointer;
}
.copy-button:hover { background: rgb(255 255 255 / .16); }

/* ---------- exercícios ---------- */

.exercise-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.exercise-item {
  display: grid; grid-template-columns: auto 1fr auto; gap: 16px; align-items: center;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px 20px;
}
.exercise-n {
  width: 36px; height: 36px; display: grid; place-items: center;
  border-radius: 10px; background: var(--surface-2); font-weight: 700;
}
.exercise-text h3 { font-size: 1.05rem; margin: 6px 0 4px; }
.exercise-text p { margin: 0; font-size: .92rem; }

.exercise-layout {
  display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 24px; align-items: start;
}
.exercise-main {
  background: var(--surface); border: 1px solid var(--border);
  border-top: 4px solid var(--lang);
  border-radius: var(--radius); padding: 28px 32px; box-shadow: var(--shadow);
}
.requirements { padding-left: 1.2em; }
.requirements li { margin-bottom: .35em; }
.exercise-aside { display: grid; gap: 16px; position: sticky; top: 88px; }
.aside-box {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px;
}
.aside-box .small-title { margin-top: 0; }
.aside-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.aside-list li { display: flex; justify-content: space-between; gap: 8px; align-items: center; }
.aside-list a { color: var(--text); text-decoration: none; }
.aside-list a:hover { text-decoration: underline; }

.reveal {
  border: 1px solid var(--border); border-radius: 12px;
  margin-top: 16px; background: var(--surface-2);
}
.reveal summary {
  cursor: pointer; padding: 14px 18px; font-weight: 600; list-style: none;
  display: flex; align-items: center; gap: 10px;
}
.reveal summary::-webkit-details-marker { display: none; }
.reveal summary::before {
  content: "▸"; font-family: var(--mono); color: var(--lang); transition: transform .15s;
}
.reveal[open] summary::before { transform: rotate(90deg); }
.reveal-body { padding: 0 18px 18px; }
.reveal-solution { border-left: 4px solid var(--lang); }
.prose h1, .prose h2, .prose h3 { font-size: 1.05rem; margin-top: 1.4em; }
.prose pre {
  background: var(--code-bg); color: var(--code-text); border-radius: 10px; position: relative;
}

/* ---------- listas: linguagens, conceitos, arquivo ---------- */

.language-grid, .concept-grid {
  list-style: none; padding: 0; margin: 0;
  display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}
.concept-grid { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }

.language-card, .concept-item {
  display: flex; flex-direction: column; gap: 6px; height: 100%;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
  color: var(--text); text-decoration: none;
  transition: border-color .15s, transform .15s;
}
.language-card:hover, .concept-item:hover { border-color: var(--lang); transform: translateY(-2px); }
.language-swatch {
  display: inline-block; width: 28px; height: 28px; border-radius: 8px; background: var(--lang);
}
.language-name { font-size: 1.2rem; font-weight: 700; }
.lang-title { display: flex; align-items: center; gap: 12px; }
.lang-title .language-swatch { width: 22px; height: 22px; }

.concept-item-top {
  display: flex; justify-content: space-between; font-size: .85rem; color: var(--muted);
}
.concept-item-top .lang-tag { color: var(--lang); }
.concept-item h3 { font-size: 1.1rem; margin: 4px 0; }
.concept-item-meta {
  display: flex; gap: 10px; align-items: center; flex-wrap: wrap;
  font-size: .85rem; color: var(--muted); margin-top: auto;
}

.archive-filters { display: flex; gap: 8px; margin-bottom: 16px; max-width: 560px; }
.archive-filters input[type="search"] {
  flex: 1; min-width: 0; font: inherit; color: var(--text);
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: 8px 14px;
}
.archive-filters input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.result-count { font-size: .9rem; }
.pagination {
  display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 28px;
}

/* ---------- estado vazio e erros ---------- */

.empty-state {
  text-align: center; max-width: 620px; margin: 24px auto;
  background: var(--surface); border: 1px dashed var(--border);
  border-radius: var(--radius); padding: 40px 32px;
}
.empty-state.small { padding: 32px 24px; }
.empty-state h1 { font-size: 1.8rem; letter-spacing: -.02em; }
.empty-state h2 { font-size: 1.3rem; }
.empty-terminal {
  display: flex; flex-direction: column; align-items: flex-start; gap: 4px;
  text-align: left; background: var(--code-bg); color: #c9d1d9;
  border-radius: 12px; padding: 16px 20px; margin: 0 auto 28px; max-width: 380px;
  font-size: .9rem;
}
.empty-terminal .muted { color: #8b949e; }
.error-code { color: #ff7b72; font-weight: 700; }
.cursor { color: #7ee787; animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) {
  .cursor { animation: none; }
  .language-card, .concept-item { transition: none; }
}

/* ---------- responsivo ---------- */

@media (max-width: 860px) {
  .card { grid-template-columns: 1fr; }
  .card-body { padding: 22px 20px; }
  .exercise-layout { grid-template-columns: 1fr; }
  .exercise-aside { position: static; }
  .exercise-main { padding: 22px 20px; }
}
@media (max-width: 560px) {
  .header-inner { padding-block: 10px; }
  .logo-name { font-size: .95rem; }
  .exercise-item { grid-template-columns: auto 1fr; }
  .exercise-item .button { grid-column: 1 / -1; justify-content: center; }
  .day-nav { width: 100%; }
  .day-nav a, .day-nav span { flex: 1; text-align: center; }
}

/* ---------- ícones das linguagens ---------- */

/* SVG monocromático como máscara, pintado com a cor da linguagem. */
.lang-icon {
  display: inline-block; flex: none;
  width: 1.1em; height: 1.1em;
  background-color: var(--lang);
  -webkit-mask: var(--icon) center / contain no-repeat;
  mask: var(--icon) center / contain no-repeat;
}
@media (prefers-color-scheme: dark) {
  .lang-icon { background-color: color-mix(in srgb, var(--lang) 55%, white); }
}
.lang-chip.is-current .lang-icon { background-color: #fff; }

.language-swatch {
  display: inline-grid; place-items: center;
  background: color-mix(in srgb, var(--lang) 12%, transparent);
}
.language-swatch .lang-icon { width: 60%; height: 60%; }
.language-card .language-swatch { width: 48px; height: 48px; border-radius: 12px; }
.lang-title .language-swatch { width: 40px; height: 40px; border-radius: 10px; }

/* ---------- trilha e "continue estudando" ---------- */

.trail { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; counter-reset: none; }
.trail-item {
  display: grid; grid-template-columns: auto 1fr; gap: 14px; align-items: center;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px 16px; transition: border-color .15s;
}
.trail-item:hover { border-color: var(--lang); }
.trail-item.is-today { border-color: var(--lang); box-shadow: inset 4px 0 0 var(--lang); }
.trail-n {
  width: 34px; height: 34px; display: grid; place-items: center;
  border-radius: 10px; background: var(--surface-2); font-weight: 700; font-size: .9rem;
}
.trail-link { color: var(--text); text-decoration: none; display: flex; flex-direction: column; gap: 4px; }
.trail-link strong { font-size: 1.02rem; }
.trail-link:hover strong { text-decoration: underline; }
.trail-meta {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center; font-size: .85rem; color: var(--muted);
}
.badge-today { background: var(--lang); border-color: var(--lang); color: #fff; }

.study-grid {
  display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}
.study-link {
  display: flex; flex-direction: column; gap: 4px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 18px; color: var(--text); text-decoration: none; transition: border-color .15s;
}
.study-link:hover { border-color: var(--lang); }
.study-link span { font-size: .85rem; }
.study-next { border-color: var(--lang); }
.study-random { border-style: dashed; }

/* ---------- conta (login, cadastro, senha) ---------- */

.auth-card {
  max-width: 440px; margin: 24px auto;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px 28px; box-shadow: var(--shadow);
}
.auth-card h1 { font-size: 1.6rem; letter-spacing: -.02em; margin-bottom: 4px; }
.form-stack { display: flex; flex-direction: column; gap: 6px; margin-top: 16px; }
.form-stack label { font-weight: 600; font-size: .92rem; margin-top: 8px; }
.form-stack input {
  font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 10px; padding: 9px 14px;
}
.form-stack input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.form-stack .button { margin-top: 16px; justify-content: center; }
.auth-links { margin-top: 18px; font-size: .92rem; }
.alert { border-radius: 10px; padding: 10px 14px; margin: 14px 0 0; font-size: .95rem; border: 1px solid; }
.alert-error { color: var(--hard); border-color: currentColor; }
.alert-ok { color: var(--easy); border-color: currentColor; }

/* ---------- painel ---------- */

.panel-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
.stat-grid {
  list-style: none; padding: 0; margin: 0 0 24px;
  display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}
.stat {
  display: flex; flex-direction: column; gap: 2px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px;
}
.stat-value { font-size: 2rem; font-weight: 700; letter-spacing: -.02em; }
.panel-grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.panel-box {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 22px;
}
.panel-box h2 { font-size: 1.1rem; margin-bottom: 10px; }
.panel-wide { grid-column: 1 / -1; }
.panel-list { list-style: none; padding: 0; margin: 0; }
.panel-list li {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 7px 0; border-top: 1px solid var(--border); font-size: .95rem;
}
.panel-list li:first-child { border-top: 0; }
.panel-list a { display: inline-flex; align-items: center; gap: 8px; color: var(--text); text-decoration: none; }
.panel-list a:hover { text-decoration: underline; }

/* ---------- logs ---------- */

.panel-box-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.status-chips { list-style: none; padding: 0; margin: 0 0 12px; display: flex; flex-wrap: wrap; gap: 8px; }
.status {
  display: inline-block; font-family: var(--mono); font-size: .85rem; font-weight: 700;
  border: 1px solid currentColor; border-radius: 999px; padding: 1px 10px; text-decoration: none;
}
.status-4xx { color: var(--medium); }
.status-5xx { color: var(--hard); }
a.status:hover { background: var(--surface-2); }
.log-top { font-size: .9rem; }
.archive-filters select {
  font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 10px; padding: 8px 12px;
}
.table-wrap { overflow-x: auto; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.log-filters { flex-wrap: wrap; }
.log-table { width: 100%; min-width: 720px; border-collapse: collapse; font-size: .9rem; }
.log-table th, .log-table td { text-align: left; padding: 8px 12px; border-top: 1px solid var(--border); vertical-align: top; }
.log-table thead th { border-top: 0; color: var(--muted); font-weight: 600; background: var(--surface-2); }
.log-path { word-break: break-all; }
.log-err { color: var(--hard); min-width: 180px; }