/* ==========================================================================
   Scratch For Fluxer - shared styles
   Surfaces follow Fluxer's dark neutrals (hue 258, very low saturation).
   The accent is the logo blue. Block colours are one tonal set with dark ink on top,
   so every block label passes contrast (checked in tests/test_design_tokens.py).
   ========================================================================== */

:root {
  color-scheme: dark;

  --hue: 258;
  --bg-page: hsl(var(--hue) 10% 6%);
  --bg-raised: hsl(var(--hue) 10% 9%);
  --bg-panel: hsl(var(--hue) 9% 12%);
  --bg-field: hsl(var(--hue) 9% 15%);
  --bg-hover: hsl(var(--hue) 9% 19%);
  --line: hsl(var(--hue) 8% 19%);
  --line-strong: hsl(var(--hue) 8% 27%);

  --text: hsl(var(--hue) 14% 95%);
  --text-2: hsl(var(--hue) 8% 74%);
  --text-3: hsl(var(--hue) 6% 60%);

  --accent: #176dff; /* the logo blue */
  --accent-solid: #176cff; /* same blue, one step deeper so white labels pass AA (4.5:1) */
  --accent-hi: #4589ff;
  --accent-lo: #0054e5;
  --accent-wash: rgb(23 109 255 / 0.14);

  --ok: #52c987;
  --warn: #f5b335;
  --danger: #ff7a80;
  --danger-solid: #c9343f;

  /* Block categories (shared by the landing page demo and the editor). */
  --cat-events: #f5b335;
  --cat-bot: #5b9bff;
  --cat-messages: #a98bff;
  --cat-info: #4cc3e0;
  --cat-control: #f59a4d;
  --cat-operators: #52c987;
  --cat-variables: #f2735a;
  --cat-lists: #ee6a93;
  --cat-data: #2ec4b0;
  --ink-on-block: #15121c;

  --font-sans: "IBM Plex Sans", "IBM Plex Sans Arabic", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --fs-xs: 0.8125rem;
  --fs-sm: 0.875rem;
  --fs-md: 1rem;
  --fs-lg: 1.125rem;
  --fs-xl: 1.375rem;
  --fs-2xl: 1.75rem;
  --fs-3xl: clamp(1.75rem, 1.2rem + 1.8vw, 2.5rem);
  --fs-hero: clamp(2.5rem, 1.5rem + 3.6vw, 4.25rem);

  --r-xs: 6px;
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 24px;

  --gutter: clamp(1rem, 4vw, 2rem);
  --header-h: 4rem;
}

/* ---------- reset + base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg-page);
  color: var(--text);
  font: 400 var(--fs-md) / 1.6 var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  flex: 1 0 auto;
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

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

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

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

p {
  margin: 0;
  text-wrap: pretty;
}

a {
  color: var(--accent-hi);
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
}

a:hover {
  color: #fff;
}

code,
kbd,
pre,
samp {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

::selection {
  background: rgb(23 109 255 / 0.45);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--accent-hi);
  outline-offset: 2px;
}

[hidden] {
  display: none !important;
}

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

.skip-link {
  position: fixed;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  border-radius: var(--r-sm);
  background: var(--accent-solid);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  transition: top 0.15s;
}

.skip-link:focus {
  top: 1rem;
  color: #fff;
}

.container {
  width: 100%;
  max-width: 76rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* Phosphor icons inherit size + colour from text. */
.ph-fill {
  flex: none;
  font-size: 1.15em;
  vertical-align: -0.14em;
}

/* ---------- buttons: little blocks with a darker lip, like the logo ---------- */
.btn {
  --btn-bg: var(--bg-hover);
  --btn-bg-hover: hsl(var(--hue) 9% 24%);
  --btn-fg: var(--text);
  --btn-lip: rgb(0 0 0 / 0.38);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.5rem;
  padding: 0.55rem 1.05rem;
  border: 0;
  border-radius: var(--r-md);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-weight: 600;
  font-size: 0.9375rem;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  box-shadow: 0 2px 0 var(--btn-lip);
  transition: background-color 0.15s, box-shadow 0.1s, transform 0.1s;
}

.btn:hover {
  background: var(--btn-bg-hover);
  color: var(--btn-fg);
}

.btn:active {
  transform: translateY(2px);
  box-shadow: 0 0 0 var(--btn-lip);
}

.btn-primary {
  --btn-bg: var(--accent-solid);
  --btn-bg-hover: #0f62f0;
  --btn-fg: #fff;
  --btn-lip: var(--accent-lo);
}

.btn-ghost {
  --btn-bg: transparent;
  --btn-bg-hover: var(--bg-hover);
  --btn-lip: transparent;
  box-shadow: none;
}

.btn-ghost:active {
  transform: none;
}

.btn-danger {
  --btn-bg: var(--danger-solid);
  --btn-bg-hover: #b22c37;
  --btn-fg: #fff;
  --btn-lip: #7d1d25;
}

.btn-sm {
  min-height: 2.125rem;
  padding: 0.3rem 0.8rem;
  font-size: 0.875rem;
  border-radius: var(--r-sm);
}

.btn-lg {
  min-height: 3rem;
  padding: 0.7rem 1.4rem;
  font-size: 1rem;
}

.btn-block {
  display: flex;
  width: 100%;
}

.btn[disabled],
.btn[aria-disabled="true"] {
  opacity: 0.5;
  pointer-events: none;
  box-shadow: none;
}

.btn[aria-busy="true"] {
  pointer-events: none;
  color: transparent;
}

.btn[aria-busy="true"] > * {
  visibility: hidden;
}

.btn[aria-busy="true"]::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  border: 2px solid rgb(255 255 255 / 0.35);
  border-top-color: #fff;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---------- forms ---------- */
.field {
  display: grid;
  gap: 0.4rem;
}

.field > label,
.label {
  font-weight: 600;
  font-size: var(--fs-sm);
}

.hint {
  color: var(--text-3);
  font-size: var(--fs-sm);
}

.input,
.textarea,
.select {
  width: 100%;
  min-height: 2.75rem;
  padding: 0.6rem 0.85rem;
  background: var(--bg-field);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.input::placeholder,
.textarea::placeholder {
  color: var(--text-3);
}

.input:hover,
.textarea:hover,
.select:hover {
  border-color: hsl(var(--hue) 8% 36%);
}

.input:focus,
.textarea:focus,
.select:focus {
  outline: none;
  border-color: var(--accent-hi);
  box-shadow: 0 0 0 3px var(--accent-wash);
}

.input[aria-invalid="true"] {
  border-color: var(--danger);
}

.input-mono {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.01em;
}

.field-error {
  display: flex;
  gap: 0.4rem;
  align-items: flex-start;
  color: var(--danger);
  font-size: var(--fs-sm);
}

/* ---------- alerts ---------- */
.alert {
  --tone: var(--accent-hi);
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
  padding: 0.8rem 1rem;
  border: 1px solid color-mix(in srgb, var(--tone) 38%, transparent);
  border-radius: var(--r-md);
  background: color-mix(in srgb, var(--tone) 11%, var(--bg-panel));
  font-size: var(--fs-sm);
  line-height: 1.5;
}

.alert > .ph-fill {
  margin-top: 0.1rem;
  color: var(--tone);
  font-size: 1.25em;
}

.alert strong {
  color: var(--text);
}

.alert-warn {
  --tone: var(--warn);
}

.alert-error {
  --tone: var(--danger);
}

.alert-ok {
  --tone: var(--ok);
}

/* ---------- surfaces ---------- */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
}

.avatar {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--bg-hover);
  object-fit: cover;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  background: var(--bg-hover);
  color: var(--text-2);
  font-size: var(--fs-xs);
  font-weight: 500;
}

/* ---------- site header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: hsl(var(--hue) 10% 6% / 0.86);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  white-space: nowrap;
}

.brand:hover {
  color: var(--text);
}

.brand img {
  width: auto;
  height: 2rem;
}

.primary-nav {
  display: flex;
  gap: 0.25rem;
  margin-inline-start: 0.5rem;
}

.primary-nav a {
  padding: 0.45rem 0.75rem;
  border-radius: var(--r-sm);
  color: var(--text-2);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
}

.primary-nav a:hover {
  background: var(--bg-hover);
  color: var(--text);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-inline-start: auto;
}

/* Account menu (a <details> element: works without JavaScript). */
.menu {
  position: relative;
}

.menu > summary {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.2rem 0.55rem 0.2rem 0.25rem;
  border-radius: 999px;
  cursor: pointer;
  list-style: none;
  color: var(--text);
}

.menu > summary::-webkit-details-marker {
  display: none;
}

.menu > summary:hover,
.menu[open] > summary {
  background: var(--bg-hover);
}

.menu-name {
  max-width: 10rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.9375rem;
  font-weight: 500;
}

.menu-panel {
  position: absolute;
  inset-inline-end: 0;
  top: calc(100% + 0.5rem);
  z-index: 60;
  min-width: 14rem;
  padding: 0.4rem;
  background: var(--bg-panel);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  box-shadow: 0 18px 40px rgb(0 0 0 / 0.5);
}

.menu-head {
  padding: 0.5rem 0.65rem 0.6rem;
  margin-bottom: 0.3rem;
  border-bottom: 1px solid var(--line);
  color: var(--text-3);
  font-size: var(--fs-xs);
  line-height: 1.4;
}

.menu-head strong {
  display: block;
  color: var(--text);
  font-size: var(--fs-sm);
}

.menu-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.5rem 0.65rem;
  border: 0;
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--text-2);
  font-size: var(--fs-sm);
  font-weight: 500;
  text-align: start;
  text-decoration: none;
  cursor: pointer;
}

.menu-item:hover {
  background: var(--bg-hover);
  color: var(--text);
}

@media (max-width: 40rem) {
  .menu-name {
    display: none;
  }

  .primary-nav {
    display: none;
  }

  .brand-name {
    font-size: 1rem;
  }
}

@media (max-width: 26rem) {
  .brand-name {
    display: none;
  }
}

/* ---------- site footer ---------- */
.site-footer {
  flex: none;
  border-top: 1px solid var(--line);
  background: var(--bg-raised);
  color: var(--text-3);
  font-size: var(--fs-sm);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  align-items: center;
  justify-content: space-between;
  padding-block: 1.5rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.footer-brand img {
  width: auto;
  height: 1.5rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
}

.site-footer a {
  color: var(--text-2);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--text);
  text-decoration: underline;
}

.footer-community {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.footer-community .ph-fill {
  font-size: 1.1em;
  color: var(--accent-hi);
}

/* ---------- toasts ---------- */
.toasts {
  position: fixed;
  inset-inline: 0;
  bottom: 1.25rem;
  z-index: 200;
  display: grid;
  justify-items: center;
  gap: 0.5rem;
  padding-inline: 1rem;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  max-width: min(32rem, 100%);
  padding: 0.65rem 1rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: var(--bg-panel);
  box-shadow: 0 14px 34px rgb(0 0 0 / 0.5);
  font-size: var(--fs-sm);
  pointer-events: auto;
  animation: toast-in 0.18s ease-out;
}

.toast .ph-fill {
  font-size: 1.25em;
}

.toast-ok .ph-fill {
  color: var(--ok);
}

.toast-error .ph-fill {
  color: var(--danger);
}

.toast-warn .ph-fill {
  color: var(--warn);
}

.toast-info .ph-fill {
  color: var(--accent-hi);
}

.toast.is-leaving {
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.2s, transform 0.2s;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
}

/* ---------- a block (used by the landing demo, error pages and category chips) ---------- */
.blk {
  --blk: var(--cat-events);
  --blk-hi: color-mix(in srgb, var(--blk) 78%, #fff);
  --blk-lip: color-mix(in srgb, var(--blk) 58%, #000);
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
  padding: 0.55rem 0.85rem;
  border-radius: 0.65rem;
  background: var(--blk);
  color: var(--ink-on-block);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.25;
  box-shadow: inset 0 1.5px 0 var(--blk-hi), 0 3px 0 var(--blk-lip);
}

.blk .ph-fill {
  font-size: 1.2em;
}

/* One class per block family. The editor's Blockly theme uses the same variables. */
.blk--events {
  --blk: var(--cat-events);
}
.blk--bot {
  --blk: var(--cat-bot);
}
.blk--messages {
  --blk: var(--cat-messages);
}
.blk--info {
  --blk: var(--cat-info);
}
.blk--control {
  --blk: var(--cat-control);
}
.blk--operators {
  --blk: var(--cat-operators);
}
.blk--variables {
  --blk: var(--cat-variables);
}
.blk--lists {
  --blk: var(--cat-lists);
}
.blk--data {
  --blk: var(--cat-data);
}

/* A "hat" block starts a script: it has a curved top and nothing can snap on above it. */
.blk--hat {
  padding-top: 0.8rem;
  border-top-left-radius: 1.9rem 1rem;
  border-top-right-radius: 0.9rem 0.6rem;
}

/* A "reporter" block hands back a value, so it is a pill and is dropped into a slot. */
.blk--round {
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  box-shadow: inset 0 0 0 1.5px var(--blk-lip), 0 2px 0 var(--blk-lip);
}

/* Typed-in value: a white pill, like Scratch. */
.blk-field {
  display: inline-grid;
  align-items: center;
  min-width: 1.75rem;
  max-width: 100%;
  padding: 0.1rem 0.65rem;
  border-radius: 999px;
  background: #fff;
  box-shadow: inset 0 0 0 1.5px var(--blk-lip);
  color: var(--ink-on-block);
  font-weight: 600;
  line-height: 1.3;
  text-align: center;
  white-space: pre;
}

/* Dropdown: a darker pill with a caret. White text on 52% of the block colour passes AA for all nine families. */
.blk-menu {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.1rem 0.45rem 0.1rem 0.65rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--blk) 52%, #000);
  color: #fff;
  font-weight: 600;
  line-height: 1.3;
}

.blk-menu .ph-fill {
  font-size: 0.8em;
}

/* Blocks stacked in a script: flush edges, a notch on top and a bump underneath, as in Scratch.
   The bump (z-index 2) paints over the next block, whose notch (z-index 1) is the dark outline it sits in. */
.stack {
  display: grid;
  justify-items: start;
}

.stack > .blk {
  border-radius: 0;
}

.stack > .blk:first-child {
  border-top-left-radius: 0.7rem;
  border-top-right-radius: 0.7rem;
}

.stack > .blk:last-child {
  border-bottom-left-radius: 0.7rem;
  border-bottom-right-radius: 0.7rem;
}

.stack > .blk--hat:first-child {
  border-top-left-radius: 1.9rem 1rem;
  border-top-right-radius: 0.9rem 0.6rem;
}

.stack > .blk:not(:first-child)::before {
  content: "";
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: 1rem;
  z-index: 1;
  width: 2rem;
  height: 0.55rem;
  background: var(--blk-lip);
  clip-path: polygon(0 0, 100% 0, 84% 100%, 16% 100%);
}

.stack > .blk:not(:last-child)::after {
  content: "";
  position: absolute;
  inset-block-start: 100%;
  inset-inline-start: 1.2rem;
  z-index: 2;
  width: 1.6rem;
  height: 0.4rem;
  background: var(--blk);
  clip-path: polygon(0 0, 100% 0, 84% 100%, 16% 100%);
}

/* ---------- login ---------- */
.auth {
  display: grid;
  place-items: center;
  padding-block: clamp(2rem, 9vh, 5rem);
}

.auth-panel {
  width: min(100%, 27rem);
  padding: clamp(1.5rem, 5vw, 2.25rem);
}

.auth-logo {
  width: auto;
  height: 3.5rem;
  margin-bottom: 1.25rem;
}

.auth-panel h1 {
  margin-bottom: 0.5rem;
  font-size: var(--fs-2xl);
}

.auth-panel .lead {
  margin-bottom: 1.5rem;
  color: var(--text-2);
}

.auth-panel .alert {
  margin-bottom: 1.25rem;
}

.facts {
  display: grid;
  gap: 0.85rem;
  margin: 1.5rem 0 0;
  padding: 1.25rem 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
  color: var(--text-2);
  font-size: var(--fs-sm);
}

.facts li {
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
}

.facts .ph-fill {
  margin-top: 0.1rem;
  color: var(--accent-hi);
  font-size: 1.25em;
}

/* ---------- notice / error page ---------- */
.notice {
  display: grid;
  justify-items: center;
  gap: 1rem;
  padding-block: clamp(3rem, 12vh, 6rem);
  text-align: center;
}

.notice h1 {
  font-size: var(--fs-3xl);
}

.notice p {
  max-width: 34rem;
  color: var(--text-2);
}

.notice .actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-top: 0.5rem;
}

.loose-block {
  margin-bottom: 0.75rem;
  transform: rotate(-5deg);
}

.loose-block .blk {
  --blk: var(--cat-variables);
  width: 4.5rem;
  height: 4.5rem;
  justify-content: center;
  font-size: 1.6rem;
  border-radius: 1rem;
}

/* A bump on the bottom edge, like the logo. */
.loose-block .blk::after {
  content: "";
  position: absolute;
  inset-inline-start: 1.1rem;
  bottom: -0.78rem;
  width: 2.3rem;
  height: 0.78rem;
  background: var(--blk-lip);
  clip-path: polygon(0 0, 100% 0, 82% 100%, 18% 100%);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (forced-colors: active) {
  .btn,
  .input {
    border: 1px solid ButtonText;
  }
}