/* ============================================================
   GFACTOR — Design System
   Tech sóbrio · Steel blue accent · 3 variations · day/night
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=JetBrains+Mono:wght@300;400;500;600&family=IBM+Plex+Mono:wght@300;400;500;600&display=swap');

:root {
  /* Steel blue accent — pulled from logo */
  --accent: oklch(0.72 0.08 245);
  --accent-soft: oklch(0.78 0.06 245);
  --accent-dim: oklch(0.55 0.07 245);
  --accent-glow: oklch(0.72 0.08 245 / 0.18);

  /* NIGHT (default) */
  --bg: oklch(0.12 0.004 245);
  --bg-1: oklch(0.15 0.005 245);
  --bg-2: oklch(0.18 0.006 245);
  --fg: oklch(0.96 0.003 245);
  --fg-muted: oklch(0.65 0.01 245);
  --fg-dim: oklch(0.45 0.01 245);
  --line: oklch(0.27 0.008 245);
  --line-soft: oklch(0.22 0.006 245);
  --overlay: oklch(0.08 0.005 245 / 0.7);

  /* Type */
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Space Grotesk', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, monospace;

  /* Spacing scale */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;
  --s-10: 128px;

  /* Container */
  --gutter: clamp(20px, 4vw, 56px);
  --maxw: 1440px;
}

[data-theme="day"] {
  --bg: oklch(0.97 0.004 245);
  --bg-1: oklch(0.94 0.005 245);
  --bg-2: oklch(0.9 0.006 245);
  --fg: oklch(0.16 0.005 245);
  --fg-muted: oklch(0.42 0.012 245);
  --fg-dim: oklch(0.62 0.01 245);
  --line: oklch(0.82 0.008 245);
  --line-soft: oklch(0.88 0.006 245);
  --overlay: oklch(0.95 0.005 245 / 0.7);
  --accent: oklch(0.55 0.1 245);
  --accent-soft: oklch(0.62 0.08 245);
  --accent-dim: oklch(0.75 0.06 245);
  --accent-glow: oklch(0.55 0.1 245 / 0.12);
}

/* Reset */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--fg);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'ss01', 'ss02';
  overflow-x: hidden;
  transition: background 0.25s ease, color 0.25s ease;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
::selection { background: var(--accent); color: var(--bg); }

/* ============================================================
   GRID BACKGROUND — visible in all variations (tech sóbrio cue)
   ============================================================ */
.grid-bg {
  position: fixed; inset: 0;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 80px 80px;
  opacity: 0.35;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 85%);
}

/* ============================================================
   TOP NAV
   ============================================================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 50;
  backdrop-filter: blur(14px) saturate(1.2);
  background: color-mix(in oklab, var(--bg) 70%, transparent);
  border-bottom: 1px solid var(--line-soft);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px var(--gutter);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--s-6);
}
.nav__logo {
  display: flex; align-items: center; gap: 10px;
  height: 52px;
}
.nav__logo img { height: 48px; width: auto; }
@media (max-width: 880px) {
  .nav__logo { height: 40px; }
  .nav__logo img { height: 36px; }
}
.nav__logo .logo-dark { display: none; }
.nav__logo .logo-light { display: block; }
[data-theme="day"] .nav__logo .logo-dark { display: block; }
[data-theme="day"] .nav__logo .logo-light { display: none; }

.nav__links {
  display: flex; gap: var(--s-6);
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.nav__links a {
  color: var(--fg-muted);
  position: relative;
  padding: 6px 0;
  transition: color 0.2s;
}
.nav__links a:hover, .nav__links a.active {
  color: var(--fg);
}
.nav__links a.active::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 1px; background: var(--accent);
}

.nav__tools {
  display: flex; align-items: center; gap: var(--s-3);
  font-family: var(--font-mono);
  font-size: 11px;
}
.nav__tool {
  border: 1px solid var(--line);
  padding: 6px 10px;
  color: var(--fg-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: all 0.2s;
  display: inline-flex; align-items: center; gap: 6px;
  height: 28px;
}
.nav__tool:hover { color: var(--fg); border-color: var(--accent); }
.nav__tool.active { color: var(--accent); border-color: var(--accent); }

.nav__lang {
  position: relative;
}
.nav__lang-menu {
  position: absolute; top: calc(100% + 6px); right: 0;
  background: var(--bg-1);
  border: 1px solid var(--line);
  display: none;
  flex-direction: column;
  min-width: 100px;
}
.nav__lang.open .nav__lang-menu { display: flex; }
.nav__lang-menu button {
  text-align: left;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--fg-muted);
  border-bottom: 1px solid var(--line-soft);
}
.nav__lang-menu button:last-child { border-bottom: none; }
.nav__lang-menu button:hover { background: var(--bg-2); color: var(--fg); }
.nav__lang-menu button.active { color: var(--accent); }

/* MOBILE menu toggle */
.nav__menu-btn { display: none; }
@media (max-width: 880px) {
  .nav__inner { grid-template-columns: auto auto; gap: var(--s-3); }
  .nav__links {
    display: none;
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column;
    background: var(--bg-1);
    border-bottom: 1px solid var(--line);
    padding: var(--s-4) var(--gutter);
    gap: var(--s-4);
  }
  .nav.open .nav__links { display: flex; }
  .nav__menu-btn {
    display: inline-flex;
    align-items: center; justify-content: center;
    width: 32px; height: 32px;
    border: 1px solid var(--line);
    color: var(--fg-muted);
  }
}

/* ============================================================
   PAGE FRAME
   ============================================================ */
main { position: relative; z-index: 1; padding-top: 88px; }
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--s-9) var(--gutter);
  position: relative;
}
.section--tight { padding-block: var(--s-7); }
.section--hero { padding-block: var(--s-8) var(--s-9); }

/* ============================================================
   TYPE TOKENS
   ============================================================ */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex; align-items: center; gap: 8px;
}
.eyebrow::before {
  content: ''; width: 24px; height: 1px; background: var(--accent);
}
.eyebrow--noline::before { display: none; }

.display {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(40px, 6vw, 88px);
  line-height: 1;
  letter-spacing: -0.025em;
  text-wrap: balance;
}
.display--xl {
  font-size: clamp(48px, 8vw, 120px);
  font-weight: 400;
}
.h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(28px, 3.4vw, 48px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(20px, 1.8vw, 26px);
  line-height: 1.15;
  letter-spacing: -0.015em;
}
.body-lg {
  font-size: clamp(17px, 1.3vw, 20px);
  line-height: 1.55;
  color: var(--fg-muted);
  text-wrap: pretty;
}
.body { color: var(--fg-muted); text-wrap: pretty; line-height: 1.6; }
.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 22px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg);
  background: transparent;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}
.btn::after {
  content: '→'; font-family: var(--font-display); font-size: 16px;
  transition: transform 0.25s ease;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn:hover::after { transform: translateX(4px); }
.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: oklch(0.1 0.005 245);
}
.btn--primary:hover {
  background: var(--accent-soft);
  border-color: var(--accent-soft);
  color: oklch(0.1 0.005 245);
}
[data-theme="day"] .btn--primary { color: oklch(0.98 0.003 245); }
[data-theme="day"] .btn--primary:hover { color: oklch(0.98 0.003 245); }
.btn--ghost { border-color: transparent; padding-inline: 0; }
.btn--ghost:hover { border-color: transparent; }

/* ============================================================
   DUOTONE IMAGES
   ============================================================ */
.duotone {
  position: relative;
  overflow: hidden;
  background: var(--bg-1);
}
.duotone img,
.duotone video {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: grayscale(1) contrast(1.1) brightness(0.55);
  transition: filter 0.4s ease;
}
.duotone::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg,
    oklch(0.18 0.06 245 / 0.55),
    oklch(0.1 0.02 245 / 0.85));
  mix-blend-mode: normal;
  pointer-events: none;
}
.duotone--strong::after {
  background: linear-gradient(135deg,
    oklch(0.22 0.08 245 / 0.7),
    oklch(0.06 0.01 245 / 0.95));
}
[data-theme="day"] .duotone img,
[data-theme="day"] .duotone video {
  filter: grayscale(1) contrast(1.05) brightness(0.95);
}
[data-theme="day"] .duotone::after {
  background: linear-gradient(135deg,
    oklch(0.6 0.08 245 / 0.35),
    oklch(0.88 0.02 245 / 0.5));
}

/* ============================================================
   CORNER BRACKETS — recurring graphic motif
   ============================================================ */
.brackets {
  position: relative;
  padding: var(--s-6);
}
.brackets::before, .brackets::after {
  content: '';
  position: absolute;
  width: 14px; height: 14px;
  border: 1px solid var(--accent);
}
.brackets::before {
  top: 0; left: 0;
  border-right: none; border-bottom: none;
}
.brackets::after {
  bottom: 0; right: 0;
  border-left: none; border-top: none;
}
.brackets--4 .brackets__tr,
.brackets--4 .brackets__bl {
  content: '';
  position: absolute;
  width: 14px; height: 14px;
  border: 1px solid var(--accent);
}
.brackets--4 .brackets__tr { top: 0; right: 0; border-left: none; border-bottom: none; }
.brackets--4 .brackets__bl { bottom: 0; left: 0; border-right: none; border-top: none; }

/* ============================================================
   CARDS
   ============================================================ */
.card {
  border: 1px solid var(--line-soft);
  background: var(--bg-1);
  padding: var(--s-6);
  position: relative;
  transition: border-color 0.25s, background 0.25s;
}
.card:hover { border-color: var(--accent); }
.card__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-dim);
  letter-spacing: 0.1em;
}
.card__title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: var(--s-4) 0 var(--s-3);
}
.card__body { color: var(--fg-muted); font-size: 14px; line-height: 1.55; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--line-soft);
  margin-top: var(--s-10);
  padding: var(--s-7) var(--gutter) var(--s-5);
  background: var(--bg);
  position: relative; z-index: 1;
}
.footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--s-6);
  padding-bottom: var(--s-7);
  border-bottom: 1px solid var(--line-soft);
}
.footer__col h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-bottom: var(--s-4);
  font-weight: 500;
}
.footer__col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer__col a { color: var(--fg-muted); transition: color 0.2s; font-size: 14px; }
.footer__col a:hover { color: var(--accent); }
.footer__brand p { color: var(--fg-muted); font-size: 14px; margin-top: var(--s-4); max-width: 320px; }
.footer__brand img { height: 40px; }
.footer__bottom {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-top: var(--s-5);
  display: flex; justify-content: space-between;
  font-family: var(--font-mono); font-size: 11px; color: var(--fg-dim);
  letter-spacing: 0.04em; text-transform: uppercase;
}
@media (max-width: 700px) {
  .footer__inner { grid-template-columns: 1fr 1fr; }
  .footer__bottom { flex-direction: column; gap: 8px; }
}

/* ============================================================
   UTILITY
   ============================================================ */
.divider {
  height: 1px;
  background-image: linear-gradient(to right, var(--line) 50%, transparent 50%);
  background-size: 8px 1px;
  width: 100%;
}
.tag {
  display: inline-block;
  font-family: var(--font-mono); font-size: 10px;
  letter-spacing: 0.12em; text-transform: uppercase;
  padding: 4px 8px; border: 1px solid var(--line);
  color: var(--fg-muted);
}
.kbd-bracket { color: var(--accent); font-family: var(--font-mono); }

/* Stats row */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}
.stat {
  background: var(--bg);
  padding: var(--s-5);
}
.stat__value {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(32px, 4vw, 48px);
  letter-spacing: -0.02em;
  line-height: 1;
}
.stat__value sup {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent);
  margin-left: 4px;
  vertical-align: top;
}
.stat__label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-muted);
  margin-top: var(--s-3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
@media (max-width: 700px) {
  .stats { grid-template-columns: 1fr 1fr; }
}

/* Fade-in on scroll */
.fade-in { opacity: 0; transform: translateY(20px); transition: all 0.7s ease; }
.fade-in.in { opacity: 1; transform: translateY(0); }

/* ============================================================
   HERO IMAGE FADE SEQUENCE
   ============================================================ */
.hero-media {
  position: absolute; inset: 0; z-index: 0;
  overflow: hidden;
}
.hero-media img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  filter: grayscale(1) contrast(1.1) brightness(0.45);
  opacity: 0;
  animation: heroFade 24s infinite;
}
.hero-media img:nth-child(1) { animation-delay: 0s; }
.hero-media img:nth-child(2) { animation-delay: 6s; }
.hero-media img:nth-child(3) { animation-delay: 12s; }
.hero-media img:nth-child(4) { animation-delay: 18s; }
@keyframes heroFade {
  0%, 20%, 100% { opacity: 0; transform: scale(1.08); }
  4%, 16% { opacity: 1; }
  8%, 12% { opacity: 1; transform: scale(1); }
}
.hero-media::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(180deg,
    oklch(0.1 0.005 245 / 0.3) 0%,
    oklch(0.12 0.01 245 / 0.6) 50%,
    var(--bg) 100%);
  pointer-events: none;
}
.hero-media::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg,
    oklch(0.2 0.1 245 / 0.4),
    oklch(0.08 0.01 245 / 0.7));
  mix-blend-mode: multiply;
  z-index: 1;
  pointer-events: none;
}
[data-theme="day"] .hero-media img {
  filter: grayscale(1) contrast(1.05) brightness(0.85);
  opacity: 0;
}
[data-theme="day"] .hero-media::after {
  background: linear-gradient(180deg,
    oklch(0.7 0.05 245 / 0.4) 0%,
    oklch(0.85 0.02 245 / 0.7) 50%,
    var(--bg) 100%);
}

/* ============================================================
   FORM ELEMENTS (Contact, Assessment)
   ============================================================ */
.field {
  display: flex; flex-direction: column;
  gap: 6px;
  margin-bottom: var(--s-5);
}
.field label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.field input,
.field select,
.field textarea {
  background: var(--bg-1);
  border: 1px solid var(--line);
  color: var(--fg);
  padding: 12px 14px;
  font-family: var(--font-body);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s, background 0.2s;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--accent);
  background: var(--bg-2);
}
.field textarea { min-height: 120px; resize: vertical; font-family: var(--font-body); }

/* ============================================================
   ANIMATED CURSOR (terminal feel)
   ============================================================ */
.cursor-blink::after {
  content: '▮';
  color: var(--accent);
  animation: blink 1s infinite;
  margin-left: 4px;
  font-weight: 300;
}
@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

/* ============================================================
   RESPONSIVE GRID HELPERS
   ============================================================ */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-5); }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-6); }
@media (max-width: 880px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
}

/* ============================================================
   GLOBAL MOBILE STACKING
   Inline two-column grids (index/sobre/contato/assessment) don't
   respond to media queries on their own — force them to stack.
   Thin bars (repeat(5,1fr)) and auto/auto utility rows are excluded.
   ============================================================ */
@media (max-width: 820px) {
  [style*="grid-template-columns: 1.1fr"],
  [style*="grid-template-columns: 1.2fr"],
  [style*="grid-template-columns: 1.4fr"],
  [style*="grid-template-columns: 1.5fr"],
  [style*="grid-template-columns: 1fr 2fr"],
  [style*="grid-template-columns: 1fr 1.4fr"],
  [style*="grid-template-columns: 1fr 1.5fr"],
  [style*="grid-template-columns: 1fr auto"],
  [style*="grid-template-columns: 1fr 1fr"] {
    grid-template-columns: 1fr !important;
    gap: var(--s-5) !important;
    align-items: start !important;
  }
}

@media (max-width: 700px) {
  main { padding-top: 72px; }
  .section { padding: var(--s-7) var(--gutter); }
  .section--hero { padding-block: var(--s-6) var(--s-7); }
  .display, .display--xl { font-size: clamp(34px, 11vw, 60px); }
  .h2 { font-size: clamp(24px, 6.5vw, 36px); }
  .panel { padding: var(--s-5) !important; }
}