/* ==========================================================================
   Base: reset, type, shared controls (buttons, toggle, toast, dialog)
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  font-feature-settings: "ss01" 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: background-color 0.4s var(--ease-out), color 0.4s var(--ease-out);
}

img,
canvas,
svg {
  display: block;
  max-width: 100%;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: 0;
  padding: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

[hidden] {
  display: none !important;
}

/* Outline, not box-shadow: components set their own box-shadow and would hide the ring. */
:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

::selection {
  background: var(--ink);
  color: var(--on-ink);
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: var(--z-toast);
  padding: 10px 16px;
  border-radius: var(--r-control);
  background: var(--ink);
  color: var(--on-ink);
  transform: translateY(-160%);
  transition: transform 0.3s var(--ease-out);
}
.skip-link:focus-visible {
  transform: none;
}

.display {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.04;
}

.nb-num {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
}

/* --------------------------------------------------------------------------
   Logo: pixel cloud + wordmark
   -------------------------------------------------------------------------- */
.nb-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
}
/* One logo per page carries the shared name, so it glides between landing and app.
   (Sidebar and topbar logos are never visible at the same time.) */
.nav .nb-logo,
.sidebar__logo .nb-logo,
.topbar__logo .nb-logo {
  view-transition-name: brand;
}
.nb-logo svg {
  width: 34px;
  height: auto;
  shape-rendering: crispEdges;
}
.logo-word {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.55rem;
  letter-spacing: -0.04em;
  line-height: 1;
  transform: translateY(-1px);
}

/* --------------------------------------------------------------------------
   Buttons: controls use the 16px radius, never pill
   -------------------------------------------------------------------------- */
.nb-btn {
  --btn-bg: var(--panel);
  --btn-fg: var(--ink);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  padding: 0 22px;
  border-radius: var(--r-control);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-weight: 600;
  font-size: 0.98rem;
  white-space: nowrap;
  box-shadow: inset 0 0 0 1px var(--line);
  transition:
    transform 0.5s var(--ease-spring),
    background-color 0.25s var(--ease-out),
    box-shadow 0.25s var(--ease-out),
    color 0.25s var(--ease-out);
  -webkit-tap-highlight-color: transparent;
}
.nb-btn .ph {
  font-size: 1.2em;
  transition: transform 0.45s var(--ease-out);
}
.nb-btn:hover {
  box-shadow: inset 0 0 0 1px var(--line-strong);
}
.nb-btn:active {
  transform: translateY(1px) scale(0.98);
  transition-duration: 0.08s;
}
.btn--primary {
  --btn-bg: var(--ink);
  --btn-fg: var(--on-ink);
  box-shadow: none;
}
.btn--primary:hover {
  box-shadow: var(--shadow-md);
}
.btn--primary:hover .ph-arrow-right,
.btn--primary:hover .ph-arrow-up-right {
  transform: translateX(3px);
}
.btn--ghost {
  --btn-bg: transparent;
}
.nb-btn[disabled] {
  opacity: 0.55;
  pointer-events: none;
}

.nb-icon-btn {
  display: inline-grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: var(--r-control);
  background: var(--panel);
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--line);
  font-size: 1.25rem;
  transition: transform 0.5s var(--ease-spring), box-shadow 0.25s var(--ease-out);
}
.nb-icon-btn:hover {
  box-shadow: inset 0 0 0 1px var(--line-strong);
}
.nb-icon-btn:active {
  transform: scale(0.94);
  transition-duration: 0.08s;
}

/* Theme toggle: sun/moon swap */
.theme-toggle {
  position: relative;
  overflow: hidden;
}
.theme-toggle .ph {
  position: absolute;
  transition: transform 0.6s var(--ease-out), opacity 0.3s var(--ease-out);
}
.theme-toggle .ph-moon {
  transform: translateY(140%) rotate(-40deg);
  opacity: 0;
}
:root[data-theme="dark"] .theme-toggle .ph-sun {
  transform: translateY(-140%) rotate(40deg);
  opacity: 0;
}
:root[data-theme="dark"] .theme-toggle .ph-moon {
  transform: none;
  opacity: 1;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .ph-sun {
    transform: translateY(-140%) rotate(40deg);
    opacity: 0;
  }
  :root:not([data-theme="light"]) .theme-toggle .ph-moon {
    transform: none;
    opacity: 1;
  }
}

/* --------------------------------------------------------------------------
   Pixel loader (used instead of spinners)
   -------------------------------------------------------------------------- */
.pixel-loader {
  display: inline-grid;
  grid-template-columns: repeat(3, 6px);
  gap: 3px;
}
.pixel-loader i {
  width: 6px;
  height: 6px;
  background: currentColor;
  animation: pixel-blink 0.9s steps(1) infinite;
}
.pixel-loader i:nth-child(2) {
  animation-delay: 0.15s;
}
.pixel-loader i:nth-child(3) {
  animation-delay: 0.3s;
}
@keyframes pixel-blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.15;
  }
}

/* --------------------------------------------------------------------------
   Toast
   -------------------------------------------------------------------------- */
.toast-region {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: var(--z-toast);
  display: grid;
  gap: 8px;
  justify-items: center;
  width: min(420px, calc(100vw - 32px));
  transform: translateX(-50%);
  pointer-events: none;
}
.nb-toast {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border-radius: var(--r-control);
  background: var(--ink);
  color: var(--on-ink);
  font-weight: 500;
  font-size: 0.95rem;
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: toast-in 0.6s var(--ease-spring) both;
}
.nb-toast.is-leaving {
  animation: toast-out 0.3s var(--ease-out) both;
}
.nb-toast .ph {
  font-size: 1.2rem;
}
@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.96);
  }
}
@keyframes toast-out {
  to {
    opacity: 0;
    transform: translateY(8px) scale(0.98);
  }
}

/* --------------------------------------------------------------------------
   Reveal on scroll (driven by IntersectionObserver in common.nb-js)
   -------------------------------------------------------------------------- */
.nb-js [data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.9s var(--ease-out),
    transform 1.1s var(--ease-out);
  transition-delay: calc(var(--i, 0) * 80ms);
}
.nb-js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* Cross-page transition between landing and app */
@view-transition {
  navigation: auto;
}
::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 0.45s;
  animation-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }
  .nb-js [data-reveal] {
    opacity: 1;
    transform: none;
  }
  @view-transition {
    navigation: none;
  }
}