:root {
  --header-height: 64px;
}

/* HEADER / TOPNAV */
.site-header {
  color: var(--paper);

  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height, 72px);
  background-color: var(--ink);
  background-image: linear-gradient(90deg, color-mix(in srgb, var(--accent) 18%, transparent), transparent 55%), var(--fx-grid), var(--fx-noise);
  background-size: auto, auto, var(--fx-noise-size);
  background-blend-mode: screen, overlay, normal;
  color: var(--on-surface);
  border-bottom: 1px solid color-mix(in srgb, var(--ink) 14%, transparent);
  box-shadow: 0 10px 24px rgba(0,0,0,0.24), 0 1px 0 color-mix(in srgb, var(--accent) 55%, transparent);
  box-shadow: 0 10px 30px rgba(0,0,0,0.16);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
  transition: transform 180ms ease-out;
}



/* Ensure header contrast in dark mode (avoid overly translucent glass) */
[data-theme="dark"] .site-header {
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--hi) 10%, transparent), transparent 70%),
    color-mix(in srgb, var(--surface-container-high) 92%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--ink) 22%, transparent);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.25;
  background:
    repeating-linear-gradient(0deg, color-mix(in srgb, var(--ink) 10%, transparent) 0 1px, transparent 1px 4px),
    repeating-linear-gradient(90deg, color-mix(in srgb, var(--ink) 8%, transparent) 0 1px, transparent 1px 6px);
  mix-blend-mode: multiply;
}

.site-header.header--visible {
  transform: translateY(0);
}

.site-header.header--hidden {
  transform: translateY(-100%);
}

body {
  padding-top: var(--header-height, 72px);
}

.top-app-bar {
  width: 100%;
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-inline: var(--gutter);
  box-sizing: border-box;
}

/* LOGO */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.5rem;
  margin-right: 0.25rem;
  border-radius: 999px;
  text-decoration: none;

  font-family: var(--logo);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: calc(var(--type-scale-base) * 0.875);

  color: var(--on-surface);
  white-space: nowrap;
}

.logo:hover {
  background: color-mix(in srgb, var(--primary) 12%, transparent);
}

.logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 999px;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  font-size: calc(var(--type-scale-base) * 0.9);
  font-weight: 600;

  background: color-mix(in srgb, var(--primary) 12%, transparent);
  color: var(--on-primary-container);
}

.logo-text {
  line-height: 1;
}

/* DESKTOP TOPNAV */
.topnav {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  min-width: 0;
}

.topnav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  padding: 0.75rem 1rem;
  border-radius: 999px;

  font-family: var(--body);
  font-size: calc(var(--type-scale-base) * 0.875);
  font-weight: var(--weight-medium);
  letter-spacing: 0.1px;

  color: var(--paper);
  text-decoration: none;

  transition: background .2s ease, color .2s ease;
  white-space: nowrap;
}

.topnav a:hover {
  background: color-mix(in srgb, var(--primary) 12%, transparent);
}

.topnav a.active {
  background: var(--primary);
  color: var(--on-primary);
}

/* THEME BUTTON */
.theme-switch {
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 999px;
  border: none;
  background: transparent;

  display: inline-flex;
  align-items: center;
  justify-content: center;

  color: var(--on-surface-variant);
  transition: background .2s ease, color .2s ease;
}

.theme-switch:hover {
  background: color-mix(in srgb, var(--primary) 12%, transparent);
}

/* MENU TOGGLE (SIDEBAR) */
.menu-toggle {
  width: 40px;
  height: 40px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.25rem;
  cursor: pointer;
  border: none;
  background: transparent;
  color: var(--on-surface);
}

.menu-toggle:hover {
  background: color-mix(in srgb, var(--primary) 8%, transparent);
}

@media (min-width: 900px) {
  .menu-toggle {
    display: none;
  }
}


/* SECTION SWITCHER */
.section-switcher {
  display: none;
}

.section-switcher__btn {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;

  padding: 0.65rem 0.9rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--outline-variant) 55%, transparent);

  background: color-mix(in srgb, var(--surface-container) 85%, var(--surface) 15%);
  color: var(--on-surface);

  font-family: var(--body);
  font-size: calc(var(--type-scale-base) * 0.875);
  font-weight: var(--weight-medium);
  letter-spacing: 0.1px;

  cursor: pointer;
}

.section-switcher__btn:hover {
  background: color-mix(in srgb, var(--primary) 10%, var(--surface));
}

.section-switcher__btn .section-switcher__caret {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--primary) 10%, transparent);
}

.section-switcher__panel {
  position: fixed;
  left: 0;
  right: 0;
  top: var(--header-height, 64px);

  z-index: 90;
  display: none;

  background: var(--surface);
  color: var(--on-surface);

  box-shadow: 0 10px 24px rgba(0, 0, 0, .18);
  border-bottom-left-radius: 16px;
  border-bottom-right-radius: 16px;

  max-height: calc(100vh - var(--header-height, 64px));
  overflow: auto;
}

.section-switcher__panel.is-open {
  display: block;
}

.section-switcher__panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;

  padding: 0.85rem 1rem 0.5rem 1rem;
  border-bottom: 1px solid color-mix(in srgb, var(--outline-variant) 45%, transparent);
}

.section-switcher__panel-title {
  font-size: calc(var(--type-scale-base) * 0.8);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--on-surface-variant, var(--on-surface));
}

.section-switcher__close {
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: none;
  background: transparent;
  color: var(--on-surface);

  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.section-switcher__close:hover {
  background: color-mix(in srgb, var(--primary) 10%, transparent);
}

.section-switcher__list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.75rem 0.75rem 1rem 0.75rem;
}

.section-switcher__item {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;

  padding: 0.85rem 1rem;
  border-radius: 14px;
  text-decoration: none;

  background: transparent;
  color: var(--on-surface);
  border: 1px solid transparent;

  font-family: var(--body);
  font-size: calc(var(--type-scale-base) * 0.95);
  font-weight: var(--weight-medium);
}

.section-switcher__item:hover {
  background: color-mix(in srgb, var(--primary) 10%, transparent);
}

.section-switcher__item.is-active {
  background: color-mix(in srgb, var(--primary) 14%, transparent);
  border-color: color-mix(in srgb, var(--primary) 22%, transparent);
}

@media (max-width: 900px) {
  .topnav {
    display: none;
  }

  .section-switcher {
    display: block;
    flex: 1;
    min-width: 0;
  }
}

.top-app-bar { min-width: 0; }
.logo { min-width: 0; max-width: 100%; }
.logo-text { overflow: hidden; text-overflow: ellipsis; }

/* HEADER CONTROLS */
.header-controls {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.stack-control {
  display: inline-flex;
  flex-direction: column;
  gap: 0.35rem;
  border-radius: 999px;
  overflow: visible;

  border: none;
  background: transparent;
}

.stack-control__btn {
  width: 34px;
  height: 34px;
  min-height: 0;
  padding: 0;
  margin: 0;

  display: flex;
  align-items: center;
  justify-content: center;

  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--outline-variant) 55%, transparent);
  background: color-mix(in srgb, var(--surface-container) 85%, var(--surface) 15%);
  color: var(--on-surface-variant);

  line-height: 0;
  font-size: 0;

  appearance: none;
  -webkit-appearance: none;
}

.stack-control__btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.stack-control__btn:disabled:hover,
.stack-control__btn:disabled:active {
  background: color-mix(in srgb, var(--surface-container) 85%, var(--surface) 15%);
}

.stack-control__btn:hover {
  background: color-mix(in srgb, var(--primary) 10%, transparent);
}

.stack-control__btn:active {
  background: color-mix(in srgb, var(--primary) 14%, transparent);
}

.stack-control__btn { position: relative; }

.stack-control__btn > .stack-control__swatch,
.stack-control__btn > .stack-control__glyph {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

/* Centraliza em ambos (primeiro/último) */
.stack-control__btn:first-child > .stack-control__swatch,
.stack-control__btn:first-child > .stack-control__glyph {
  bottom: 50%;
  transform: translateX(-50%) translateY(50%);
}

.stack-control__btn:last-child > .stack-control__swatch,
.stack-control__btn:last-child > .stack-control__glyph {
  top: 50%;
  transform: translateX(-50%) translateY(-50%);
}

/* SWATCHES */
.stack-control__swatch {
  width: 16px;
  height: 16px;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--outline-variant) 55%, transparent);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.10);
}

.stack-control__swatch--hue-inc {
  background: hsl(calc(var(--seed-h) + 60) var(--seed-s) 50%);
}

.stack-control__swatch--hue-dec {
  background: hsl(calc(var(--seed-h) - 60) var(--seed-s) 50%);
}

/* GLYPHS */
.stack-control__glyph {
  font-family: var(--display);
  line-height: 1;
  font-weight: 700;
  color: var(--on-surface-variant);
  letter-spacing: -0.02em;
}

.stack-control__glyph--big {
  font-size: calc(var(--type-scale-base) * 0.9);
}

.stack-control__glyph--small {
  font-size: calc(var(--type-scale-base) * 0.72);
}

/* SWATCHES */
.stack-control__swatch {
  width: 14px;
  height: 14px;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--outline-variant) 55%, transparent);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.10);
}

.stack-control__swatch--hue-inc {
  background: hsl(calc(var(--seed-h) + 60) var(--seed-s) 50%);
}

.stack-control__swatch--hue-dec {
  background: hsl(calc(var(--seed-h) - 60) var(--seed-s) 50%);
}

/* GLYPHS */
.stack-control__glyph {
  font-family: var(--display);
  line-height: 1;
  font-weight: 700;
  color: var(--on-surface-variant);
}

.stack-control__glyph--big {
  font-size: calc(var(--type-scale-base) * 0.9);
  transform: translateY(1px);
}

.stack-control__glyph--small {
  font-size: calc(var(--type-scale-base) * 0.72);
  transform: translateY(-1px);
}




/* === Header contrast guarantee for dark mode === */
[data-theme="dark"] .site-header {
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--hi) 10%, transparent),
      transparent 70%
    ),
    color-mix(in srgb, var(--surface-container-high) 92%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--ink) 22%, transparent);
}
/* === End header patch === */


/* === Minimal header stack-controls (compact, still vertical) === */
.header-controls{
  gap: 0.4rem;
}

.stack-control{
  gap: 0.25rem;
}

.stack-control__btn{
  width: 28px;
  height: 28px;

  border: 1px solid color-mix(in srgb, var(--outline-variant) 40%, transparent);
  background: transparent;
  color: var(--on-surface-variant);
  box-shadow: none;
}

.stack-control__btn:hover{
  background: color-mix(in srgb, var(--primary) 7%, transparent);
}

.stack-control__btn:active{
  background: color-mix(in srgb, var(--primary) 10%, transparent);
}

.stack-control__swatch{
  width: 10px;
  height: 10px;
  border: 1px solid color-mix(in srgb, var(--outline-variant) 35%, transparent);
  box-shadow: none;
}

.stack-control__icon.material-symbols-outlined{
  font-size: 18px;
  line-height: 1;
  color: var(--on-surface-variant);
}

/* Hide legacy Abc glyph styling if still present somewhere */
.stack-control__glyph{
  font-family: inherit;
}
/* === End minimal header stack-controls === */