/* ============================================================
   INSTITUTO INTELLOS — Blog
   Design tokens · base · header · footer
   Minimalista · marca intellos (índigo profundo + menta)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Hanken+Grotesk:wght@400;500;600;700;800&display=swap');

:root {
  /* brand */
  --primary:        oklch(0.47 0.16 296);
  --primary-strong: oklch(0.40 0.16 296);
  --primary-soft:   oklch(0.95 0.03 296);
  --mint:           oklch(0.72 0.13 164);
  --mint-strong:    oklch(0.60 0.12 164);
  --mint-soft:      oklch(0.95 0.045 165);

  /* neutrals (cool, índigo-tinted) */
  --bg:        oklch(0.992 0.003 300);
  --surface:   oklch(1 0 0);
  --surface-2: oklch(0.975 0.006 300);
  --ink:       oklch(0.23 0.03 295);
  --ink-2:     oklch(0.40 0.025 295);
  --muted:     oklch(0.55 0.018 295);
  --faint:     oklch(0.70 0.012 295);
  --border:    oklch(0.92 0.007 295);
  --border-2:  oklch(0.87 0.01 295);

  --shadow-sm: 0 1px 2px oklch(0.3 0.04 296 / 0.05), 0 1px 3px oklch(0.3 0.04 296 / 0.05);
  --shadow-md: 0 6px 18px oklch(0.3 0.04 296 / 0.08), 0 2px 6px oklch(0.3 0.04 296 / 0.05);
  --shadow-lg: 0 20px 50px oklch(0.28 0.05 296 / 0.14), 0 6px 16px oklch(0.3 0.04 296 / 0.07);

  --font: 'Hanken Grotesk', system-ui, -apple-system, sans-serif;

  --sp-1: 4px;  --sp-2: 8px;  --sp-3: 12px; --sp-4: 16px;
  --sp-5: 24px; --sp-6: 32px; --sp-7: 48px; --sp-8: 64px;
  --sp-9: 96px; --sp-10: 128px;

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 18px;
  --radius-pill: 999px;

  --maxw: 1180px;
  --measure: 70ch;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea { font-family: inherit; }
::selection { background: var(--mint-soft); color: var(--primary-strong); }

/* ---------- Layout helpers ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--sp-5); }
.wrap--narrow { max-width: 760px; }
.section { padding-block: var(--sp-8); }
.section--tight { padding-block: var(--sp-7); }

.eyebrow {
  font-size: 0.78rem; letter-spacing: 0.16em; text-transform: uppercase;
  font-weight: 700; color: var(--mint-strong);
}

/* ---------- Type ---------- */
.h-page {
  font-weight: 800; font-size: clamp(2.4rem, 1.6rem + 3vw, 3.6rem);
  line-height: 1.02; letter-spacing: -0.03em; color: var(--ink); text-wrap: balance;
}
.h-sec {
  font-weight: 700; font-size: clamp(1.5rem, 1.15rem + 1.4vw, 1.95rem);
  line-height: 1.12; letter-spacing: -0.02em; color: var(--ink); text-wrap: balance;
}
.lead {
  font-size: clamp(1.08rem, 1rem + 0.4vw, 1.25rem); line-height: 1.55;
  color: var(--ink-2); font-weight: 400;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-2);
  font-weight: 600; font-size: 0.95rem; padding: 11px 20px;
  border-radius: var(--radius-pill); white-space: nowrap;
  transition: background 0.2s var(--ease), color 0.2s var(--ease),
              transform 0.12s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
}
.btn svg { width: 17px; height: 17px; }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.btn--primary { background: var(--primary); color: #fff; box-shadow: var(--shadow-sm); }
.btn--primary:hover { background: var(--primary-strong); box-shadow: var(--shadow-md); }
.btn--mint { background: var(--mint); color: oklch(0.24 0.05 164); }
.btn--mint:hover { background: var(--mint-strong); color: #fff; }
.btn--ghost { color: var(--ink); border: 1px solid var(--border-2); background: var(--surface); }
.btn--ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn--lg { padding: 14px 26px; font-size: 1rem; }
.btn--sm { padding: 8px 15px; font-size: 0.86rem; }

/* ---------- Icon button ---------- */
.icon-btn {
  width: 42px; height: 42px; display: grid; place-items: center;
  border-radius: var(--radius-pill); color: var(--ink-2);
  border: 1px solid var(--border); background: var(--surface);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.icon-btn:hover { background: var(--surface-2); color: var(--primary); border-color: var(--border-2); }
.icon-btn svg { width: 18px; height: 18px; }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: color-mix(in oklch, var(--surface) 90%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--border);
}
.site-header__inner { display: flex; align-items: center; gap: var(--sp-5); height: 72px; }
.brand { display: flex; align-items: center; margin-right: auto; }
.brand__logo { height: 38px; width: auto; display: block; }

.nav { display: flex; align-items: center; gap: var(--sp-1); }
.nav > a, .nav-drop__btn {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 0.96rem; font-weight: 600; color: var(--ink-2);
  padding: var(--sp-2) var(--sp-3); border-radius: var(--radius-sm);
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav > a:hover, .nav-drop__btn:hover { color: var(--primary); background: var(--surface-2); }
.nav > a.is-active { color: var(--primary); }
.nav-drop__btn svg { width: 15px; height: 15px; transition: transform 0.2s var(--ease); }

/* dropdown */
.nav-drop { position: relative; }
.nav-drop__menu {
  position: absolute; top: calc(100% + 8px); left: 0; min-width: 200px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  padding: var(--sp-2); display: grid; gap: 2px;
  opacity: 0; visibility: hidden; transform: translateY(-6px);
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease), visibility 0.18s;
}
.nav-drop:hover .nav-drop__menu,
.nav-drop:focus-within .nav-drop__menu,
.nav-drop.open .nav-drop__menu { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-drop:hover .nav-drop__btn svg,
.nav-drop.open .nav-drop__btn svg { transform: rotate(180deg); }
.nav-drop__menu a {
  display: flex; align-items: center; gap: var(--sp-2);
  padding: 9px 12px; border-radius: var(--radius-sm); font-size: 0.94rem;
  font-weight: 600; color: var(--ink-2); transition: background 0.15s, color 0.15s;
}
.nav-drop__menu a::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--mint); }
.nav-drop__menu a:hover { background: var(--surface-2); color: var(--primary); }

.header-tools { display: flex; align-items: center; gap: var(--sp-3); }
.menu-toggle { display: none; }

/* ============================================================
   FOOTER (simplificado, como a referência)
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--border);
  background: oklch(0.20 0.04 296);
  color: oklch(0.86 0.02 300);
  margin-top: var(--sp-9);
}
.footer-top {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: var(--sp-7); padding-block: var(--sp-8) var(--sp-7); flex-wrap: wrap;
}
.footer-brand { display: flex; flex-direction: column; gap: var(--sp-4); max-width: 340px; }
.footer-brand__logo { height: 40px; width: auto; align-self: flex-start; object-fit: contain; }
.footer-brand p { color: oklch(0.72 0.02 300); font-size: 0.95rem; line-height: 1.6; }
.footer-col h4 {
  font-size: 0.78rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--mint); font-weight: 700; margin-bottom: var(--sp-4);
}
.footer-col ul { list-style: none; padding: 0; display: grid; gap: var(--sp-3); }
.footer-col a { color: oklch(0.82 0.02 300); font-size: 0.96rem; transition: color 0.2s; }
.footer-col a:hover { color: #fff; }
.footer-cols { display: flex; gap: var(--sp-8); flex-wrap: wrap; }
.footer-bottom {
  border-top: 1px solid oklch(0.32 0.04 296);
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-4); padding-block: var(--sp-5); flex-wrap: wrap;
}
.footer-bottom p { color: oklch(0.66 0.02 300); font-size: 0.86rem; }
.footer-bottom a { color: oklch(0.82 0.04 165); font-weight: 600; }
.footer-bottom a:hover { color: var(--mint); }

/* ---------- Mobile nav drawer ---------- */
.mobile-nav { position: fixed; inset: 0; z-index: 80; display: none; }
.mobile-nav.open { display: block; }
.mobile-nav__scrim { position: absolute; inset: 0; background: oklch(0.2 0.03 296 / 0.5); }
.mobile-nav__panel {
  position: absolute; top: 0; right: 0; height: 100%; width: min(84vw, 340px);
  background: var(--surface); box-shadow: var(--shadow-lg);
  padding: var(--sp-5); display: flex; flex-direction: column; gap: var(--sp-2);
  animation: slideIn 0.3s var(--ease);
}
@keyframes slideIn { from { transform: translateX(100%); } to { transform: translateX(0); } }
.mobile-nav__head { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--sp-3); }
.mobile-nav__panel a {
  font-size: 1.18rem; font-weight: 600; padding: var(--sp-3) 0;
  border-bottom: 1px solid var(--border); color: var(--ink);
}
.mobile-nav__panel .btn { margin-top: var(--sp-4); }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .nav { display: none; }
  .header-tools .btn { display: none; }
  .menu-toggle { display: grid; }
}

/* ============================================================
   DARK MODE
   ============================================================ */
[data-theme="dark"] {
  --bg:           oklch(0.12 0.025 296);
  --surface:      oklch(0.16 0.025 296);
  --surface-2:    oklch(0.21 0.025 296);
  --ink:          oklch(0.95 0.010 296);
  --ink-2:        oklch(0.79 0.015 296);
  --muted:        oklch(0.62 0.015 296);
  --faint:        oklch(0.46 0.012 296);
  --border:       oklch(0.27 0.025 296);
  --border-2:     oklch(0.34 0.025 296);
  --primary-soft: oklch(0.22 0.08  296);
  --mint-soft:    oklch(0.20 0.07  164);
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.40), 0 1px 3px oklch(0 0 0 / 0.30);
  --shadow-md: 0 6px 18px oklch(0 0 0 / 0.50), 0 2px 6px oklch(0 0 0 / 0.30);
  --shadow-lg: 0 20px 50px oklch(0 0 0 / 0.65), 0 6px 16px oklch(0 0 0 / 0.35);
}
[data-theme="dark"] .site-footer { background: oklch(0.09 0.025 296); }
[data-theme="dark"] .cat-banner  { background: linear-gradient(135deg, oklch(0.18 0.06 296), oklch(0.26 0.08 290)); }
[data-theme="dark"] ::selection   { background: var(--primary); color: #fff; }

/* ── Theme toggle icon visibility ── */
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
.theme-toggle svg { width: 18px; height: 18px; }

/* ============================================================
   READING PROGRESS BAR
   ============================================================ */
.read-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px;
  z-index: 200; pointer-events: none;
}
.read-progress__bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary) 0%, var(--mint) 100%);
  width: 0%;
  transition: width 0.08s linear;
}