/* ====================================================================
   SILVERIO ESTALEIRO — DESIGN TOKENS
   Editorial técnico · Swiss grid · oversized type · brand green primary
   ==================================================================== */

:root {
  /* --- Base palette --- */
  --ink:           oklch(18% 0.012 200);     /* near black, cool tinted */
  --ink-2:         oklch(32% 0.010 200);
  --ink-3:         oklch(48% 0.008 200);
  --rule:          oklch(86% 0.006 200);     /* hairline */
  --rule-2:        oklch(92% 0.005 200);
  --paper:         oklch(98.5% 0.004 180);   /* ice white */
  --paper-2:       oklch(96% 0.006 180);     /* card / muted block */
  --paper-3:       oklch(93% 0.008 180);

  /* --- Brand --- */
  --green:         oklch(64% 0.13 175);      /* matched to existing site teal-green */
  --green-deep:    oklch(48% 0.12 175);
  --green-soft:    oklch(94% 0.04 175);
  --green-ink:     oklch(28% 0.07 175);

  /* --- Accent --- */
  --orange:        oklch(63% 0.17 48);       /* burnt orange */
  --orange-deep:   oklch(52% 0.18 45);

  /* --- Density (set by tweaks) --- */
  --density:       1;                        /* 1.0 = espaçoso, 0.72 = compacto */
  --section-y:     calc(120px * var(--density));
  --gutter:        clamp(20px, 4vw, 56px);
  --maxw:          1440px;

  /* --- Type --- */
  --font-sans: "Inter Tight", "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, monospace;

  /* --- Motion --- */
  --ease: cubic-bezier(.2,.7,.2,1);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  font-feature-settings: "ss01", "cv11";
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-size: 16px;
  line-height: 1.5;
}

img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; padding: 0; }

/* ============================ TYPE SCALE ============================ */

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 500;
}
.eyebrow .idx { color: var(--green-deep); margin-right: 8px; }

.h-display {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: clamp(48px, 8.5vw, 132px);
  line-height: 0.95;
  letter-spacing: -0.035em;
}
.h-1 {
  font-weight: 500;
  font-size: clamp(40px, 5.5vw, 84px);
  line-height: 1.0;
  letter-spacing: -0.03em;
}
.h-2 {
  font-weight: 500;
  font-size: clamp(28px, 3.4vw, 52px);
  line-height: 1.05;
  letter-spacing: -0.025em;
}
.h-3 {
  font-weight: 500;
  font-size: clamp(22px, 2.2vw, 32px);
  line-height: 1.15;
  letter-spacing: -0.018em;
}
.h-4 {
  font-weight: 500;
  font-size: 18px;
  line-height: 1.3;
  letter-spacing: -0.005em;
}
.body-lg {
  font-size: clamp(17px, 1.4vw, 21px);
  line-height: 1.45;
  color: var(--ink-2);
  letter-spacing: -0.005em;
}
.body {
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-2);
}
.tech {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-3);
}

/* ============================ LAYOUT ============================ */

.shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  padding: var(--section-y) 0;
  border-top: 1px solid var(--rule);
}
.section.no-rule { border-top: 0; }
.section.tight { padding: calc(var(--section-y) * 0.55) 0; }

.section-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: end;
  margin-bottom: calc(64px * var(--density));
}
.section-head .right { color: var(--ink-2); max-width: 52ch; }
@media (max-width: 800px) {
  .section-head { grid-template-columns: 1fr; gap: 24px; }
}

/* hairline frame columns rendered occasionally for the technical feel */
.col-frame {
  position: absolute; inset: 0;
  display: grid; grid-template-columns: repeat(12, 1fr);
  pointer-events: none;
}
.col-frame::before, .col-frame::after { content: ""; }

/* ============================ HEADER ============================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.site-header.on-dark {
  background: color-mix(in srgb, var(--ink) 75%, transparent);
  color: var(--paper);
  border-bottom-color: color-mix(in srgb, var(--paper) 18%, transparent);
}
.header-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  height: 72px;
  gap: 48px;
}
.brand-mark {
  display: flex; align-items: center; gap: 10px;
  font-weight: 500;
  letter-spacing: -0.01em;
}
.brand-mark .dot {
  width: 28px; height: 28px;
  background: var(--green);
  border-radius: 4px;
  display: grid; place-items: center;
  color: white;
  font-family: var(--font-mono);
  font-weight: 700; font-size: 13px;
}
.brand-mark .name { font-size: 15px; }
.brand-mark .name b { font-weight: 600; }

.brand-logo {
  display: block;
  height: 32px;
  width: auto;
  /* logo is already in brand green; let it sit on light surface */
}
.header-row .brand-logo { height: 30px; }
/* on dark/footer surface, the green still reads well — no inversion needed */
.brand-logo-footer { height: 36px; }
@media (max-width: 720px) {
  .header-row .brand-logo { height: 24px; }
}

.primary-nav {
  display: flex; gap: 36px;
  font-size: 14px;
}
.primary-nav a {
  position: relative;
  padding: 6px 0;
  color: inherit;
  letter-spacing: -0.005em;
  transition: color .2s var(--ease);
}
.primary-nav a::after {
  content: "";
  position: absolute; left: 0; right: 100%; bottom: 0;
  height: 1px; background: var(--orange);
  transition: right .25s var(--ease);
}
.primary-nav a:hover::after,
.primary-nav a.active::after { right: 0; }
.primary-nav a.active { color: var(--ink); }
.primary-nav a:hover { color: var(--orange-deep); }

.header-utilities {
  display: flex; align-items: center; gap: 20px;
  font-size: 13px;
}
.lang-switch {
  display: inline-flex; gap: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 3px;
}
.site-header.on-dark .lang-switch { border-color: color-mix(in srgb, var(--paper) 22%, transparent); }
.lang-switch button {
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  transition: all .2s var(--ease);
}
.site-header.on-dark .lang-switch button { color: color-mix(in srgb, var(--paper) 60%, transparent); }
.lang-switch button.active {
  background: var(--ink);
  color: var(--paper);
}
.site-header.on-dark .lang-switch button.active {
  background: var(--paper);
  color: var(--ink);
}

/* ============================ BUTTONS ============================ */

.btn {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 14px 22px;
  border-radius: 0;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.005em;
  transition: all .2s var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn .arrow {
  width: 18px; height: 10px;
  display: inline-block;
  background: currentColor;
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 10'><path d='M0 5 H16 M11 0 L17 5 L11 10' fill='none' stroke='black' stroke-width='1.4'/></svg>") center/contain no-repeat;
          mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 10'><path d='M0 5 H16 M11 0 L17 5 L11 10' fill='none' stroke='black' stroke-width='1.4'/></svg>") center/contain no-repeat;
  transition: transform .25s var(--ease);
}
.btn:hover .arrow { transform: translateX(4px); }

.btn-primary {
  background: var(--green);
  color: white;
}
.btn-primary:hover { background: var(--green-deep); }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}
.btn-ghost:hover { background: var(--ink); color: var(--paper); }

.btn-link {
  padding: 0;
  background: none;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  border-radius: 0;
  padding-bottom: 4px;
}
.btn-link:hover { color: var(--orange-deep); border-color: var(--orange-deep); }

.on-dark .btn-ghost { color: var(--paper); border-color: var(--paper); }
.on-dark .btn-ghost:hover { background: var(--paper); color: var(--ink); }

/* ============================ PLACEHOLDERS ============================ */
/* monochrome plate with mono-font caption describing what goes there */
.ph {
  position: relative;
  width: 100%;
  background:
    repeating-linear-gradient(
      135deg,
      transparent 0 14px,
      color-mix(in srgb, currentColor 6%, transparent) 14px 15px
    ),
    color-mix(in srgb, var(--ink) 92%, transparent);
  color: color-mix(in srgb, var(--paper) 88%, transparent);
  overflow: hidden;
  isolation: isolate;
}
.ph .ph-meta {
  position: absolute;
  inset: auto 16px 14px 16px;
  display: flex; justify-content: space-between; align-items: end;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--paper) 75%, transparent);
}
.ph .ph-meta .l { max-width: 70%; }
.ph .ph-tl {
  position: absolute; top: 14px; left: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--paper) 60%, transparent);
}
.ph .ph-tr {
  position: absolute; top: 14px; right: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--paper) 60%, transparent);
}
.ph .ph-center {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--paper) 50%, transparent);
}
.ph.light {
  background:
    repeating-linear-gradient(
      135deg,
      transparent 0 14px,
      color-mix(in srgb, var(--ink) 5%, transparent) 14px 15px
    ),
    var(--paper-3);
  color: var(--ink-2);
}
.ph.light .ph-meta,
.ph.light .ph-tl,
.ph.light .ph-tr,
.ph.light .ph-center { color: var(--ink-3); }

/* corner ticks for "technical drawing" feel */
.ph::before, .ph::after,
.ph .corner-bl, .ph .corner-br {
  content: "";
  position: absolute;
  width: 10px; height: 10px;
  border: 1px solid color-mix(in srgb, currentColor 35%, transparent);
}
.ph::before { top: 0; left: 0; border-right: 0; border-bottom: 0; }
.ph::after  { top: 0; right: 0; border-left: 0; border-bottom: 0; }
.ph .corner-bl { bottom: 0; left: 0; border-right: 0; border-top: 0; }
.ph .corner-br { bottom: 0; right: 0; border-left: 0; border-top: 0; }

/* ============================ MISC ============================ */

.divider { height: 1px; background: var(--rule); margin: 0; border: 0; }

.kbd {
  font-family: var(--font-mono);
  font-size: 11px;
  border: 1px solid var(--rule);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--ink-3);
}

.tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-3);
}
.tag::before {
  content: ""; width: 6px; height: 6px; background: var(--green); border-radius: 50%;
}

/* number callout */
.bignum {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: clamp(40px, 5vw, 76px);
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--orange-deep);
  font-variant-numeric: tabular-nums;
}

/* used to scope hovers on cards */
.card { transition: transform .35s var(--ease); }
.card:hover { transform: translateY(-2px); }
.card .ph { transition: filter .4s var(--ease); }
.card:hover .ph { filter: brightness(1.05); }

/* footer */
.site-footer {
  background: var(--ink);
  color: color-mix(in srgb, var(--paper) 80%, transparent);
  padding: 96px 0 48px;
  margin-top: 0;
}
.site-footer a { color: inherit; }
.site-footer a:hover { color: var(--paper); }
.site-footer .row { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; }
@media (max-width: 800px) { .site-footer .row { grid-template-columns: 1fr 1fr; } }
.site-footer h5 {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: color-mix(in srgb, var(--paper) 50%, transparent);
  font-weight: 500;
  margin: 0 0 16px;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; font-size: 14px; }
.site-footer .legal {
  margin-top: 64px; padding-top: 24px;
  border-top: 1px solid color-mix(in srgb, var(--paper) 12%, transparent);
  display: flex; justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--paper) 50%, transparent);
}

/* modal */
.modal-back {
  position: fixed; inset: 0;
  background: color-mix(in srgb, var(--ink) 70%, transparent);
  z-index: 100;
  display: grid; place-items: center;
  padding: 24px;
  opacity: 0; pointer-events: none;
  transition: opacity .25s var(--ease);
}
.modal-back.open { opacity: 1; pointer-events: auto; }
.modal {
  background: var(--paper);
  width: 100%;
  max-width: 720px;
  padding: 56px;
  position: relative;
  transform: translateY(12px);
  transition: transform .35s var(--ease);
  max-height: 90vh;
  overflow: auto;
}
.modal-back.open .modal { transform: none; }
.modal.modal-wide {
  max-width: 1100px;
  padding: 0;
  overflow: hidden;
}
.modal.modal-wide .close {
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(6px);
  z-index: 5;
}
.visit-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  min-height: 560px;
}
.visit-map {
  position: relative;
  background: var(--ink);
  display: flex;
  flex-direction: column;
}
.visit-map iframe {
  width: 100%;
  flex: 1;
  border: 0;
  display: block;
  filter: grayscale(20%) contrast(0.95);
}
.visit-meta {
  padding: 20px 24px;
  background: var(--ink);
  color: var(--paper);
  border-top: 1px solid color-mix(in srgb, var(--paper) 14%, transparent);
}
.visit-meta-k {
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: color-mix(in srgb, var(--paper) 55%, transparent);
  margin-bottom: 6px;
}
.visit-meta-v { font-size: 14px; color: var(--paper); }
.visit-form {
  padding: 48px 48px 40px;
  overflow-y: auto;
  max-height: 90vh;
}
@media (max-width: 800px) {
  .modal.modal-wide { max-width: 92vw; }
  .visit-grid { grid-template-columns: 1fr; min-height: 0; }
  .visit-map { min-height: 280px; }
  .visit-form { padding: 32px 24px; }
}
.modal .close {
  position: absolute; top: 20px; right: 20px;
  width: 36px; height: 36px;
  border: 1px solid var(--rule);
  border-radius: 50%;
  display: grid; place-items: center;
}
.modal .close:hover { border-color: var(--ink); }
.modal label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--ink-3);
  margin-bottom: 8px;
}
.modal input, .modal select, .modal textarea {
  width: 100%;
  font: inherit;
  font-size: 15px;
  padding: 12px 0;
  border: 0; border-bottom: 1px solid var(--rule);
  background: transparent;
  color: var(--ink);
  outline: none;
  transition: border-color .2s var(--ease);
}
.modal input:focus, .modal select:focus, .modal textarea:focus { border-color: var(--ink); }
.modal textarea { min-height: 80px; resize: vertical; }
.modal .form-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin: 24px 0 32px;
}
.modal .form-grid .full { grid-column: 1 / -1; }
@media (max-width: 600px) {
  .modal { padding: 32px 24px; }
  .modal .form-grid { grid-template-columns: 1fr; }
}

/* simple fade-in on scroll, opt-in via .fade */
/* simple fade-in on scroll, opt-in via .fade — guarded so content is never hidden if transitions stall */
@media (prefers-reduced-motion: no-preference) {
  .fade:not(.in) { opacity: 0; transform: translateY(16px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
  .fade.in { opacity: 1; transform: none; }
}

/* utility */
.mono { font-family: var(--font-mono); }
.numeric { font-variant-numeric: tabular-nums; }
.uppercase { text-transform: uppercase; letter-spacing: 0.1em; }

/* ============================ LIGHTBOX ============================ */
.lightbox {
  position: fixed; inset: 0;
  background: rgba(15, 18, 16, 0.96);
  z-index: 200;
  display: grid;
  grid-template-rows: auto 1fr auto;
  opacity: 0; pointer-events: none;
  transition: opacity .25s var(--ease);
}
.lightbox.open { opacity: 1; pointer-events: auto; }
.lightbox-bar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 24px 32px;
  color: var(--paper);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.lightbox-bar .meta {
  display: flex; gap: 24px; align-items: baseline;
}
.lightbox-bar .code {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.12em;
  color: rgba(255,255,255,0.55); text-transform: uppercase;
}
.lightbox-bar h3 {
  margin: 0; font-size: 18px; font-weight: 500; letter-spacing: -0.01em;
  color: var(--paper);
}
.lightbox-bar .counter {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em;
  color: rgba(255,255,255,0.55);
}
.lightbox-close {
  background: transparent; border: 1px solid rgba(255,255,255,0.2);
  color: var(--paper);
  width: 40px; height: 40px; border-radius: 50%;
  display: grid; place-items: center; cursor: pointer;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}
.lightbox-close:hover { border-color: var(--paper); background: rgba(255,255,255,0.06); }
.lightbox-stage {
  position: relative;
  display: grid; place-items: center;
  padding: 24px 80px;
  min-height: 0;
  overflow: hidden;
}
.lightbox-stage img {
  max-width: 100%; max-height: 100%;
  object-fit: contain;
  display: block;
}
.lightbox-nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  background: transparent; border: 1px solid rgba(255,255,255,0.2);
  color: var(--paper);
  width: 48px; height: 48px; border-radius: 50%;
  display: grid; place-items: center; cursor: pointer;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}
.lightbox-nav:hover { border-color: var(--paper); background: rgba(255,255,255,0.06); }
.lightbox-nav.prev { left: 24px; }
.lightbox-nav.next { right: 24px; }
.lightbox-nav svg { width: 16px; height: 16px; }
.lightbox-thumbs {
  display: flex; gap: 8px; padding: 16px 32px 24px;
  overflow-x: auto; justify-content: center;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.lightbox-thumb {
  flex: 0 0 auto;
  width: 80px; height: 60px;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
  opacity: 0.55;
  transition: opacity .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
  padding: 0; background: transparent;
}
.lightbox-thumb img {
  width: 100%; height: 100%; object-fit: cover; display: block;
}
.lightbox-thumb:hover { opacity: 0.85; }
.lightbox-thumb.active { opacity: 1; border-color: var(--paper); }
@media (max-width: 720px) {
  .lightbox-bar { padding: 16px 20px; }
  .lightbox-bar h3 { font-size: 15px; }
  .lightbox-stage { padding: 16px 16px; }
  .lightbox-nav { width: 40px; height: 40px; }
  .lightbox-nav.prev { left: 12px; }
  .lightbox-nav.next { right: 12px; }
  .lightbox-thumb { width: 56px; height: 42px; }
  .lightbox-thumbs { padding: 12px 16px 16px; }
}