/* Data Engineering Tools BR — Design System
   Inspirado em Vercel / Linear / Raycast. Tokens compartilhados com a
   biblioteca de ebooks para consistência visual. Dark mode nativo. */
:root {
  --color-primary: #004aad;
  --color-primary-dark: #003580;
  --color-primary-light: #e8f0fe;
  --color-accent: #4d8fff;
  --color-bg: #ffffff;
  --color-bg-secondary: #f8f9fb;
  --color-bg-tertiary: #f0f2f5;
  --color-text: #1a1a2e;
  --color-text-secondary: #5a6270;
  --color-text-muted: #8b939e;
  --color-border: #e2e6ed;
  --color-border-light: #eef1f5;
  --color-success: #0d7a4a;
  --color-success-bg: #f0fdf4;
  --color-warning: #b45309;
  --color-warning-bg: #fffbeb;
  --color-danger: #c0392b;
  --color-danger-bg: #fef2f2;
  --color-info: #0369a1;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "JetBrains Mono", Menlo, Consolas, monospace;
  --sidebar-width: 264px;
  --header-height: 56px;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.12);
  --transition: 150ms ease;
  --content-max-width: 860px;
  --font-size-base: 16px;
  --line-height: 1.65;
}

[data-theme="dark"] {
  --color-primary: #4d8fff;
  --color-primary-dark: #3b7ae8;
  --color-primary-light: #1a2744;
  --color-accent: #6ea8ff;
  --color-bg: #0f1117;
  --color-bg-secondary: #161922;
  --color-bg-tertiary: #1e2230;
  --color-text: #e8eaed;
  --color-text-secondary: #a0a8b8;
  --color-text-muted: #6b7385;
  --color-border: #2a2f3d;
  --color-border-light: #222733;
  --color-success: #34d399;
  --color-success-bg: #052e16;
  --color-warning: #fbbf24;
  --color-warning-bg: #422006;
  --color-danger: #f87171;
  --color-danger-bg: #3b1113;
  --color-info: #60a5fa;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,.4);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.5);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: var(--font-size-base); -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans); color: var(--color-text); background: var(--color-bg);
  line-height: var(--line-height); -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); text-decoration: underline; }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }
code { font-family: var(--font-mono); font-size: .875em; background: var(--color-bg-tertiary); padding: .1em .35em; border-radius: 4px; }

.skip-link {
  position: absolute; top: -100%; left: 16px; z-index: 9999;
  padding: 8px 16px; background: var(--color-primary); color: #fff;
  border-radius: var(--radius); font-weight: 600;
}
.skip-link:focus { top: 16px; }

/* ── Header ── */
.site-header {
  position: sticky; top: 0; z-index: 100; height: var(--header-height);
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
  display: flex; align-items: center; padding: 0 16px; gap: 12px;
}
.site-header__logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: .95rem; color: var(--color-text); white-space: nowrap; }
.site-header__logo:hover { text-decoration: none; color: var(--color-primary); }
.site-header__logo svg, .site-header__logo img { width: 28px; height: 28px; flex-shrink: 0; }
.site-header__search { flex: 1; max-width: 460px; position: relative; }
.site-header__search input {
  width: 100%; padding: 8px 12px 8px 36px; border: 1px solid var(--color-border);
  border-radius: var(--radius); background: var(--color-bg-secondary); color: var(--color-text);
  font-size: .875rem; transition: border-color var(--transition);
}
.site-header__search input:focus { border-color: var(--color-primary); outline: none; }
.site-header__search svg { position: absolute; left: 10px; top: 50%; transform: translateY(-50%); width: 16px; height: 16px; color: var(--color-text-muted); pointer-events: none; }
.site-header__actions { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.btn-icon {
  display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px;
  border: none; border-radius: var(--radius); background: transparent; color: var(--color-text-secondary);
  cursor: pointer; transition: background var(--transition), color var(--transition);
}
.btn-icon:hover { background: var(--color-bg-secondary); color: var(--color-text); text-decoration: none; }
.btn-icon svg { width: 18px; height: 18px; }

/* ── Layout ── */
.layout { display: flex; min-height: calc(100vh - var(--header-height)); }
.layout--catalog { flex-direction: column; max-width: 1200px; margin: 0 auto; padding: 8px 24px 48px; width: 100%; }

.sidebar {
  width: var(--sidebar-width); flex-shrink: 0; border-right: 1px solid var(--color-border);
  background: var(--color-bg-secondary); overflow-y: auto; position: sticky;
  top: var(--header-height); height: calc(100vh - var(--header-height)); padding: 16px 0;
}
.sidebar__title { padding: 0 16px 8px; font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--color-text-muted); }
.sidebar__nav a {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 6px 16px; font-size: .875rem; color: var(--color-text-secondary);
  border-left: 3px solid transparent; transition: all var(--transition);
}
.sidebar__nav a:hover { color: var(--color-text); background: var(--color-bg-tertiary); text-decoration: none; }
.sidebar__nav a.active { color: var(--color-primary); font-weight: 600; border-left-color: var(--color-primary); background: var(--color-primary-light); }
.sidebar__nav .badge { font-size: .7rem; background: var(--color-bg-tertiary); color: var(--color-text-muted); border-radius: 999px; padding: 1px 8px; }

.content-wrapper { flex: 1; display: flex; min-width: 0; }
.main-content { flex: 1; max-width: var(--content-max-width); padding: 28px 40px 80px; margin: 0 auto; width: 100%; }

/* ── Typography ── */
.main-content h1 { font-size: 2.1rem; font-weight: 800; line-height: 1.15; margin-bottom: 8px; letter-spacing: -.02em; }
.main-content h2 { font-size: 1.4rem; font-weight: 700; margin-top: 40px; margin-bottom: 14px; padding-bottom: 8px; border-bottom: 1px solid var(--color-border); scroll-margin-top: calc(var(--header-height) + 16px); }
.main-content h3 { font-size: 1.1rem; font-weight: 600; margin-top: 24px; margin-bottom: 10px; }
.main-content p { margin-bottom: 14px; }
.main-content ul, .main-content ol { margin-bottom: 16px; padding-left: 22px; }
.main-content li { margin-bottom: 6px; }
.lead { font-size: 1.1rem; color: var(--color-text-secondary); line-height: 1.55; margin-bottom: 8px; }

/* ── Tool hero ── */
.tool-hero { margin-bottom: 8px; }
.tool-hero__cat { font-size: .8rem; font-weight: 600; color: var(--color-text-secondary); margin-bottom: 8px; text-transform: none; }
.tool-hero__cat a { color: var(--color-primary); }
.pill-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.pill { font-size: .72rem; font-weight: 600; color: var(--color-text-secondary); background: var(--color-bg-secondary); border: 1px solid var(--color-border); border-radius: 999px; padding: 2px 10px; }

/* ── Tool workspace / engines ── */
.tool-app-wrap { margin: 24px 0 8px; }
#tool-app { border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-bg-secondary); padding: 16px; }
.tool-app__loading { color: var(--color-text-muted); font-size: .9rem; padding: 24px; text-align: center; }
.tool-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 12px; }
.tool-field { display: flex; align-items: center; gap: 6px; font-size: .8rem; color: var(--color-text-secondary); }
.tool-field select, .tool-field input[type="number"], .tool-field input[type="text"] {
  font-family: inherit; font-size: .8rem; padding: 6px 8px; border: 1px solid var(--color-border);
  border-radius: var(--radius); background: var(--color-bg); color: var(--color-text);
}
.tool-field input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--color-primary); }
.tool-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.tool-panel { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.tool-panel__label { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; color: var(--color-text-muted); display: flex; justify-content: space-between; align-items: center; }
.tool-textarea, .tool-output {
  width: 100%; min-height: 220px; resize: vertical; font-family: var(--font-mono); font-size: .82rem;
  line-height: 1.5; padding: 12px; border: 1px solid var(--color-border); border-radius: var(--radius);
  background: var(--color-bg); color: var(--color-text); tab-size: 2; white-space: pre; overflow: auto;
}
.tool-output { white-space: pre-wrap; word-break: break-word; }
.tool-actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 8px 14px; font-size: .85rem; font-weight: 600;
  border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-bg);
  color: var(--color-text); cursor: pointer; transition: all var(--transition); font-family: inherit;
}
.btn:hover { border-color: var(--color-primary); color: var(--color-primary); text-decoration: none; }
.btn--primary { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.btn--primary:hover { background: var(--color-primary-dark); border-color: var(--color-primary-dark); color: #fff; }
.tool-status { font-size: .8rem; padding: 8px 12px; border-radius: var(--radius); margin-top: 4px; display: none; }
.tool-status.show { display: block; }
.tool-status--ok { background: var(--color-success-bg); color: var(--color-success); border: 1px solid var(--color-success); }
.tool-status--err { background: var(--color-danger-bg); color: var(--color-danger); border: 1px solid var(--color-danger); }
.tool-status--info { background: var(--color-primary-light); color: var(--color-info); border: 1px solid var(--color-info); }

/* Result tables (profiler, hash…) */
.tool-result-table { width: 100%; border-collapse: collapse; font-size: .8rem; margin-top: 12px; }
.tool-result-table th, .tool-result-table td { padding: 8px 10px; text-align: left; border-bottom: 1px solid var(--color-border); }
.tool-result-table thead { background: var(--color-bg-tertiary); }
.tool-result-table th { font-weight: 600; }
.tool-stats { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 10px; margin: 12px 0; }
.tool-stat { border: 1px solid var(--color-border); border-radius: var(--radius); padding: 12px; background: var(--color-bg); }
.tool-stat strong { display: block; font-size: 1.3rem; color: var(--color-primary); }
.tool-stat span { font-size: .75rem; color: var(--color-text-muted); }
.uuid-list { list-style: none; padding: 0; }
.uuid-list li { display: flex; justify-content: space-between; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: .82rem; padding: 6px 0; border-bottom: 1px solid var(--color-border-light); }

/* Diff */
.diff-line { display: block; font-family: var(--font-mono); font-size: .8rem; white-space: pre-wrap; word-break: break-word; padding: 0 8px; }
.diff-add { background: var(--color-success-bg); color: var(--color-success); }
.diff-del { background: var(--color-danger-bg); color: var(--color-danger); }
.diff-eq { color: var(--color-text-secondary); }

/* ── Dropzone (upload de arquivos: Parquet, etc.) ── */
.tool-dropzone { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px; text-align: center; padding: 32px 20px; border: 2px dashed var(--color-border); border-radius: var(--radius-lg); background: var(--color-bg-secondary); cursor: pointer; transition: border-color .15s, background .15s; }
.tool-dropzone:hover, .tool-dropzone:focus-visible { border-color: var(--color-primary); background: var(--color-primary-light); outline: none; }
.tool-dropzone.is-drag { border-color: var(--color-primary); background: var(--color-primary-light); }
.tool-dropzone__icon { font-size: 2rem; line-height: 1; }
.tool-dropzone__title { margin: 4px 0 0; font-size: .95rem; }
.tool-dropzone__hint { margin: 0; font-size: .8rem; color: var(--color-text-muted); }

/* ── Callouts ── */
.callout { padding: 12px 14px; border-radius: var(--radius); margin-bottom: 16px; font-size: .9rem; border: 1px solid var(--color-border); }
.callout--warning { background: var(--color-warning-bg); border-color: var(--color-warning); color: var(--color-warning); }

/* ── how-to / examples ── */
.howto { counter-reset: step; }
.howto li { margin-bottom: 8px; }
.examples { display: grid; gap: 16px; }
.example { border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 16px; background: var(--color-bg-secondary); }
.example h3 { margin-top: 0; }
.example__io { margin-bottom: 8px; }
.example__label { font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; color: var(--color-text-muted); }
.example pre { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 10px; overflow: auto; margin-top: 4px; }
.example pre code { background: none; padding: 0; font-size: .8rem; }
.example__note { font-size: .85rem; color: var(--color-text-secondary); margin: 6px 0 0; }

/* ── FAQ ── */
.faq-item { border-bottom: 1px solid var(--color-border); }
.faq-item summary { padding: 14px 0; font-weight: 600; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 1.25rem; color: var(--color-text-muted); }
.faq-item[open] summary::after { content: "−"; }
.faq-item .faq-answer { padding-bottom: 14px; color: var(--color-text-secondary); font-size: .92rem; }

/* ── Cards ── */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; margin-bottom: 8px; }
.card { border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 20px; background: var(--color-bg); transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition); }
.card:hover { box-shadow: var(--shadow-md); border-color: var(--color-primary); transform: translateY(-2px); }
.card__category { font-size: .72rem; font-weight: 700; letter-spacing: .02em; color: var(--color-primary); margin-bottom: 8px; }
.card__title { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; }
.card__title a { color: var(--color-text); }
.card__title a:hover { color: var(--color-primary); }
.card__desc { font-size: .85rem; color: var(--color-text-secondary); margin-bottom: 10px; line-height: 1.5; }
.card__meta { font-size: .78rem; color: var(--color-text-muted); display: flex; gap: 12px; }

/* ── Category grid ── */
.cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; margin-bottom: 8px; }
.cat-card { display: flex; flex-direction: column; gap: 4px; padding: 16px; border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-bg); transition: all var(--transition); }
.cat-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-sm); text-decoration: none; transform: translateY(-2px); }
.cat-card__icon { font-size: 1.6rem; }
.cat-card__name { font-weight: 700; color: var(--color-text); }
.cat-card__count { font-size: .75rem; color: var(--color-text-muted); }

/* ── Hero (landing) ── */
.hero { text-align: center; padding: 48px 0 32px; }
.hero h1 { font-size: 2.6rem; font-weight: 800; margin-bottom: 14px; letter-spacing: -.02em; line-height: 1.1; }
.hero p { font-size: 1.1rem; color: var(--color-text-secondary); max-width: 680px; margin: 0 auto 24px; }
.hero__search { position: relative; max-width: 520px; margin: 0 auto 24px; }
.hero__search input { width: 100%; padding: 12px 16px 12px 42px; border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-bg); color: var(--color-text); font-size: 1rem; box-shadow: var(--shadow-sm); }
.hero__search input:focus { border-color: var(--color-primary); outline: none; box-shadow: var(--shadow-md); }
.hero__search svg { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); width: 18px; height: 18px; color: var(--color-text-muted); pointer-events: none; }
.hero__stats { display: flex; justify-content: center; flex-wrap: wrap; gap: 32px; font-size: .82rem; color: var(--color-text-muted); }
.hero__stats strong { display: block; font-size: 1.4rem; color: var(--color-primary); }

.layout--catalog section { margin-top: 40px; }
.layout--catalog h2 { font-size: 1.4rem; font-weight: 700; margin-bottom: 16px; }
.filter-empty { color: var(--color-text-muted); padding: 24px 0; }

/* ── CTA ── */
.cta { text-align: center; margin: 48px 0 8px; padding: 40px 24px; border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: linear-gradient(135deg, var(--color-primary-light), var(--color-bg-secondary)); }
.cta h2 { border: none; margin: 0 0 8px; }
.cta > p { color: var(--color-text-secondary); max-width: 520px; margin: 0 auto 20px; }
.cta__form { max-width: 480px; margin: 0 auto; text-align: left; }
.cta__label { display: block; font-size: .75rem; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; color: var(--color-text-muted); margin-bottom: 8px; }
.cta__fields { display: flex; gap: 8px; flex-wrap: wrap; }
.cta__input {
  flex: 1; min-width: 200px; padding: 10px 14px; font-size: .95rem; font-family: inherit;
  border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-bg);
  color: var(--color-text); transition: border-color var(--transition);
}
.cta__input:focus { border-color: var(--color-primary); outline: none; box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 20%, transparent); }
.cta__input::placeholder { color: var(--color-text-muted); }
.cta__form .btn--primary { flex-shrink: 0; padding: 10px 20px; }
.cta__privacy { margin-top: 12px; font-size: .78rem; color: var(--color-text-muted); text-align: center; }
.cta__honeypot { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.cta__ok { max-width: 480px; margin: 0 auto 8px; padding: 12px 16px; border-radius: var(--radius); background: var(--color-success-bg); color: var(--color-success); border: 1px solid var(--color-success); font-weight: 600; }

/* ── Comments placeholder ── */
.comments { border: 1px dashed var(--color-border); border-radius: var(--radius); padding: 20px; background: var(--color-bg-secondary); }
.comments__hint { color: var(--color-text-muted); font-size: .9rem; margin: 0; }

/* ── Breadcrumb ── */
.breadcrumb { display: flex; flex-wrap: wrap; gap: 4px; align-items: center; font-size: .8rem; color: var(--color-text-muted); margin-bottom: 16px; }
.breadcrumb a { color: var(--color-text-secondary); }
.breadcrumb span[aria-current] { color: var(--color-text); font-weight: 500; }

/* ── Search results ── */
.search-results {
  position: absolute; top: 100%; left: 0; right: 0; margin-top: 4px; background: var(--color-bg);
  border: 1px solid var(--color-border); border-radius: var(--radius); box-shadow: var(--shadow-lg);
  max-height: 360px; overflow-y: auto; display: none; z-index: 200;
}
.search-results.active { display: block; }
.search-results a { display: block; padding: 10px 14px; font-size: .875rem; color: var(--color-text); border-bottom: 1px solid var(--color-border-light); }
.search-results a:hover { background: var(--color-bg-secondary); text-decoration: none; }
.search-results a small { display: block; color: var(--color-text-muted); font-size: .75rem; margin-top: 2px; }

/* ── Footer ── */
.site-footer { border-top: 1px solid var(--color-border); padding: 32px 24px; text-align: center; font-size: .8rem; color: var(--color-text-muted); background: var(--color-bg-secondary); }
.site-footer a { color: var(--color-text-secondary); }
.site-footer p { margin-bottom: 4px; }

/* ── Back to top ── */
.back-to-top { position: fixed; bottom: 24px; right: 24px; z-index: 50; width: 44px; height: 44px; border-radius: 50%; background: var(--color-primary); color: #fff; border: none; cursor: pointer; box-shadow: var(--shadow-md); opacity: 0; visibility: hidden; transition: all var(--transition); display: flex; align-items: center; justify-content: center; }
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--color-primary-dark); }
.back-to-top svg { width: 20px; height: 20px; }

/* ── Sidebar mobile ── */
.sidebar-toggle { display: none; }
.sidebar-overlay { position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 140; display: none; }
.sidebar-overlay.active { display: block; }

/* ── Responsive ── */
@media (max-width: 900px) {
  .tool-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  :root { --sidebar-width: 100%; }
  .sidebar { position: fixed; left: -100%; top: var(--header-height); width: 85%; max-width: 320px; z-index: 150; transition: left var(--transition); box-shadow: var(--shadow-lg); }
  .sidebar.open { left: 0; }
  .sidebar-toggle { display: inline-flex; }
  .main-content { padding: 20px 16px 64px; }
  .main-content h1 { font-size: 1.6rem; }
  .hero h1 { font-size: 1.9rem; }
  .layout--catalog { padding: 8px 16px 40px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}