/*
  SPDX-FileCopyrightText: 2026 OrielOS contributors
  SPDX-License-Identifier: GPL-3.0-or-later

  orielos.org
  Layout: the page opens on the OrielOS desktop. The default wallpaper fills the
  first screen, a glass "Welcome to OrielOS" window holds the headline, and the
  centred taskbar runs along its bottom edge. Below it, quiet left-aligned
  sections: goals, status, download and contributors. Colours, type and shapes
  follow the OrielOS brand; Daylight, the one warm accent, marks "now".
*/

@font-face {
  font-family: "Noto Sans";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/noto-sans-latin-400-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Noto Sans";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("fonts/noto-sans-latin-600-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Noto Sans Display";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("fonts/noto-sans-display-latin-700-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  /* Colour: Mist, Ink, Slate and Oriel Blue; Daylight once, for "now" */
  --surface: #f4f6fb;
  --raised: #ffffff;
  --text: #121a2e;
  --text-muted: #5b6478;
  --accent: #3a66f0;
  --accent-hover: #2f57d9;
  --accent-pressed: #1f3bb0;
  --on-accent: #ffffff;
  --accent-text: #3a66f0;
  --focus-ring: #3a66f0;
  --daylight: #ffb547;
  --daylight-halo: rgb(255 181 71 / 0.28);
  --line: rgb(18 26 46 / 0.1);
  --line-strong: rgb(18 26 46 / 0.2);
  --glass: rgb(255 255 255 / 0.84);
  --glass-rim: rgb(255 255 255 / 0.8);
  --taskbar: rgb(244 246 251 / 0.8);
  --shadow-window: 0 2px 6px rgb(18 26 46 / 0.08), 0 28px 72px rgb(31 59 176 / 0.2);
  --wallpaper: url("images/daybreak.svg");
  --glyph-files: #6d97fa;
  --glyph-web: #3a66f0;
  --glyph-store: #1f3bb0;
  --glyph-line: #ffffff;
  --only-light: inline;
  --only-dark: none;

  /* Type: Noto Sans Display for headings, Noto Sans for everything else */
  --font-display: "Noto Sans Display", "Noto Sans", system-ui, sans-serif;
  --font-sans: "Noto Sans", system-ui, sans-serif;
  --step-hero: clamp(2.25rem, 1.55rem + 2.4vw, 3.25rem);
  --step-title: clamp(1.875rem, 1.5rem + 1.3vw, 2.5rem);
  --step-subtitle: 1.25rem;
  --step-lead: clamp(1.0625rem, 1rem + 0.25vw, 1.1875rem);
  --step-small: 0.875rem;

  /* Space and shape */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 999px;
  --gutter: clamp(16px, 4vw, 40px);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --surface: #0c1530;
    --raised: #121c40;
    --text: #ffffff;
    --text-muted: #c9d6f5;
    --accent-hover: #4d76f2;
    --accent-text: #9cc2ff;
    --focus-ring: #9cc2ff;
    --line: rgb(255 255 255 / 0.12);
    --line-strong: rgb(255 255 255 / 0.24);
    --glass: rgb(12 21 48 / 0.78);
    --glass-rim: rgb(156 194 255 / 0.26);
    --taskbar: rgb(8 15 38 / 0.8);
    --shadow-window: 0 2px 6px rgb(0 0 0 / 0.3), 0 28px 72px rgb(0 0 0 / 0.5);
    --wallpaper: url("images/nightfall.svg");
    --glyph-files: #9cc2ff;
    --glyph-web: #6d97fa;
    --glyph-store: #3a66f0;
    --only-light: none;
    --only-dark: inline;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --surface: #0c1530;
  --raised: #121c40;
  --text: #ffffff;
  --text-muted: #c9d6f5;
  --accent-hover: #4d76f2;
  --accent-text: #9cc2ff;
  --focus-ring: #9cc2ff;
  --line: rgb(255 255 255 / 0.12);
  --line-strong: rgb(255 255 255 / 0.24);
  --glass: rgb(12 21 48 / 0.78);
  --glass-rim: rgb(156 194 255 / 0.26);
  --taskbar: rgb(8 15 38 / 0.8);
  --shadow-window: 0 2px 6px rgb(0 0 0 / 0.3), 0 28px 72px rgb(0 0 0 / 0.5);
  --wallpaper: url("images/nightfall.svg");
  --glyph-files: #9cc2ff;
  --glyph-web: #6d97fa;
  --glyph-store: #3a66f0;
  --only-light: none;
  --only-dark: inline;
  color-scheme: dark;
}

/* Base */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  -webkit-tap-highlight-color: rgb(58 102 240 / 0.16);
}

a {
  touch-action: manipulation;
}

[id] {
  scroll-margin-top: var(--space-4);
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--text);
  font: 400 1rem/1.6 var(--font-sans);
}

h1,
h2,
h3,
p,
ul,
ol,
dl,
dd {
  margin: 0;
}

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

img {
  height: auto;
}

[hidden] {
  display: none !important;
}

.only-light {
  display: var(--only-light);
}

.only-dark {
  display: var(--only-dark);
}

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

a:hover {
  text-decoration-thickness: 2px;
}

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

code {
  font-family: ui-monospace, "Noto Sans Mono", monospace;
  font-size: 0.875em;
}

.wrap {
  width: 100%;
  max-width: 72rem;
  margin-inline: auto;
  padding-left: max(var(--gutter), env(safe-area-inset-left, 0px));
  padding-right: max(var(--gutter), env(safe-area-inset-right, 0px));
}

.skip {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 10;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--raised);
  color: var(--text);
  font-weight: 600;
}

.skip:not(:focus) {
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--raised);
  color: var(--text);
  font-weight: 600;
  line-height: 1.3;
  text-align: center;
  text-decoration: none;
}

.button:hover {
  border-color: var(--accent-text);
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--on-accent);
}

.button.primary:hover {
  border-color: var(--accent-hover);
  background: var(--accent-hover);
}

.button.primary:active {
  border-color: var(--accent-pressed);
  background: var(--accent-pressed);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.actions + .actions {
  margin-top: var(--space-3);
}

/* GitHub and Discord buttons in their own brand colours, with their marks in white, as both brands allow */

.button.brand {
  gap: var(--space-2);
  padding-inline: 16px;
  border-color: rgb(255 255 255 / 0.2);
  color: #fff;
}

.button.brand svg {
  flex: none;
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.button.github {
  background: #24292f;
}

.button.github:hover {
  border-color: rgb(255 255 255 / 0.4);
  background: #32383f;
}

.button.discord {
  background: #5865f2;
}

.button.discord:hover {
  border-color: rgb(255 255 255 / 0.4);
  background: #4752c4;
}

/* The desktop: wallpaper, welcome window and taskbar */

.desktop {
  /* Narrow screens: the wallpaper's bay window sits above the welcome window,
     fading into the page below it. */
  --art-height: max(30rem, 56.25vw);
  display: flex;
  flex-direction: column;
  background:
    linear-gradient(transparent calc(var(--art-height) * 0.78), var(--surface) var(--art-height)) top / 100% var(--art-height) no-repeat,
    var(--wallpaper) center top / auto var(--art-height) no-repeat,
    var(--surface);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-8);
  padding-block: var(--space-4);
}

.brand {
  display: flex;
  flex: none;
  border-radius: var(--radius-sm);
}

.brand img {
  width: auto;
  height: 38px;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0 var(--space-6);
  padding: 0;
  list-style: none;
}

.site-nav a {
  display: block;
  padding-block: var(--space-2);
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--accent-text);
}

#main {
  display: flex;
  flex: 1;
  align-items: center;
}

.hero {
  padding-block: calc(var(--art-height) * 0.72 - 70px) var(--space-8);
}

.welcome {
  max-width: 34rem;
  overflow: hidden;
  border: 1px solid var(--glass-rim);
  border-radius: var(--radius-md);
  background: var(--glass);
  box-shadow: var(--shadow-window);
  -webkit-backdrop-filter: blur(24px) saturate(1.4);
  backdrop-filter: blur(24px) saturate(1.4);
}

.titlebar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 36px;
  padding-inline: 14px;
  border-bottom: 1px solid var(--line);
  color: var(--text-muted);
  font-size: 0.8125rem;
  font-weight: 600;
}

.titlebar img {
  width: 16px;
  height: 16px;
}

.welcome-body {
  display: grid;
  justify-items: start;
  gap: var(--space-6);
  padding: clamp(24px, 4vw, 40px);
}

.welcome h1 {
  font: 700 var(--step-hero)/1.1 var(--font-display);
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.lead {
  color: var(--text-muted);
  font-size: var(--step-lead);
  line-height: 1.6;
}

.status {
  color: var(--text-muted);
  font-size: var(--step-small);
  font-weight: 600;
}

.taskbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  min-height: 48px;
  padding-left: max(var(--space-3), env(safe-area-inset-left, 0px));
  padding-right: max(var(--space-3), env(safe-area-inset-right, 0px));
  border-top: 1px solid var(--glass-rim);
  background: var(--taskbar);
  -webkit-backdrop-filter: blur(24px) saturate(1.4);
  backdrop-filter: blur(24px) saturate(1.4);
  pointer-events: none;
  user-select: none;
}

.taskbar-apps {
  display: flex;
  grid-column: 2;
  gap: var(--space-1);
}

.tile {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
}

.tile img,
.glyph {
  width: 24px;
  height: 24px;
}

.glyph-files path {
  fill: var(--glyph-files);
}

.glyph-web circle {
  fill: var(--glyph-web);
}

.glyph-store path {
  fill: var(--glyph-store);
}

.glyph .glyph-line {
  fill: none;
  stroke: var(--glyph-line);
  stroke-width: 1.4;
  stroke-linecap: round;
}

.glyph-store .glyph-line {
  stroke: var(--glyph-store);
  stroke-width: 1.8;
}

.taskbar-tray {
  display: flex;
  grid-column: 3;
  justify-self: end;
  gap: var(--space-3);
  padding-right: var(--space-2);
  color: var(--text);
}

.taskbar-tray svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Sections */

.section {
  padding-block: clamp(4rem, 9vw, 7rem);
}

.band {
  background: var(--raised);
}

.section h2 {
  margin-bottom: clamp(2rem, 4vw, 3rem);
  font: 700 var(--step-title)/1.15 var(--font-display);
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.section h3 {
  font: 600 var(--step-subtitle)/1.4 var(--font-sans);
  text-wrap: balance;
}

.section-lead {
  max-width: 40rem;
  margin-top: calc(-1 * clamp(1rem, 2vw, 1.5rem));
  margin-bottom: var(--space-8);
  color: var(--text-muted);
  font-size: var(--step-lead);
}

.section-note {
  max-width: 40rem;
  margin-top: var(--space-6);
  color: var(--text-muted);
}

.goals {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
  gap: clamp(2rem, 4vw, 3rem) clamp(2rem, 4vw, 3.5rem);
  padding: 0;
  list-style: none;
}

.goals li {
  display: grid;
  align-content: start;
  gap: var(--space-2);
}

.icon {
  width: 32px;
  height: 32px;
  margin-bottom: var(--space-2);
  fill: none;
  stroke: var(--accent-text);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.goals p {
  color: var(--text-muted);
}

.keys {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
  padding-top: var(--space-2);
}

kbd {
  font: 600 0.8125rem/1 var(--font-sans);
}

kbd kbd {
  display: inline-block;
  min-width: 1.9em;
  padding: 5px 7px 4px;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: var(--radius-sm);
  background: var(--raised);
  color: var(--text);
  text-align: center;
}

.combo {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  color: var(--text-muted);
}

/* Status: the milestones are a real sequence */

.milestones {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-8);
  padding: 0;
  list-style: none;
}

.milestones li {
  position: relative;
  display: grid;
  align-content: start;
  gap: var(--space-1);
  padding-top: 40px;
}

.milestones li::before {
  content: "";
  position: absolute;
  top: 4px;
  left: 0;
  z-index: 1;
  width: 16px;
  height: 16px;
  border: 2px solid var(--line-strong);
  border-radius: 50%;
  background: var(--surface);
}

.milestones li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 11px;
  right: calc(-1 * var(--space-8));
  left: 16px;
  height: 2px;
  background: var(--line-strong);
}

.milestones .is-now::before {
  border-color: var(--daylight);
  background: var(--daylight);
  box-shadow: 0 0 0 6px var(--daylight-halo);
}

.milestone-when {
  color: var(--text-muted);
  font-size: var(--step-small);
  font-weight: 600;
}

.is-now .milestone-when {
  color: var(--text);
}

.milestones p {
  color: var(--text-muted);
}

.working {
  display: grid;
  gap: var(--space-4);
  margin-top: clamp(3rem, 6vw, 4.5rem);
}

.checks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
  gap: var(--space-3) var(--space-8);
  padding: 0;
  list-style: none;
}

.checks li {
  position: relative;
  padding-left: 30px;
}

.checks li::before {
  content: "";
  position: absolute;
  top: 0.3em;
  left: 6px;
  width: 6px;
  height: 11px;
  border: solid var(--accent-text);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* Download */

.download {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  align-items: start;
  gap: var(--space-8) clamp(2rem, 6vw, 5rem);
}

.download-card {
  display: grid;
  justify-items: start;
  gap: var(--space-4);
  padding: clamp(24px, 4vw, 36px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.download-card.is-empty {
  border: 1px dashed var(--line-strong);
}

.download-card h3 {
  font: 700 1.5rem/1.25 var(--font-display);
}

.download-card p {
  color: var(--text-muted);
}

.checksum {
  max-width: 100%;
  font-size: var(--step-small);
}

.checksum code {
  overflow-wrap: anywhere;
  color: var(--text);
}

.download-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-6);
  font-weight: 600;
}

.needs {
  display: grid;
  gap: var(--space-4);
}

.specs {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: var(--space-3) var(--space-6);
}

.specs dt {
  font-weight: 600;
}

.specs dd {
  color: var(--text-muted);
}

.limits {
  display: grid;
  gap: var(--space-4);
  margin-top: clamp(3rem, 6vw, 4.5rem);
}

.limit-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 26rem), 1fr));
  gap: var(--space-4) var(--space-8);
  padding: 0;
  list-style: none;
  color: var(--text-muted);
}

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

/* Contributors */

.people {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(7.5rem, 1fr));
  gap: var(--space-2);
  margin-bottom: var(--space-8);
  padding: 0;
  list-style: none;
}

.people a {
  display: grid;
  justify-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-2);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text);
  text-align: center;
  text-decoration: none;
}

.people a:hover {
  border-color: var(--line);
  background: var(--raised);
}

.people img {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--line);
}

.person-name {
  max-width: 100%;
  font-size: var(--step-small);
  font-weight: 600;
  overflow-wrap: anywhere;
}

/* Footer */

.site-footer .wrap {
  display: grid;
  gap: var(--space-3);
  max-width: 72rem;
  padding-block: 0 clamp(2rem, 6vw, 3.5rem);
  color: var(--text-muted);
  font-size: var(--step-small);
}

.site-footer p {
  max-width: 52rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-6);
  padding: var(--space-8) 0 var(--space-2);
  border-top: 1px solid var(--line);
  list-style: none;
  font-weight: 600;
}

/* Not-found page */

.not-found .wrap {
  display: grid;
  justify-items: start;
  gap: var(--space-6);
  padding-block: clamp(3rem, 10vw, 7rem);
}

.not-found h1 {
  font: 700 clamp(2rem, 1.6rem + 1.6vw, 2.5rem)/1.3 var(--font-display);
}

/* Without backdrop blur, the glass needs to be solid to stay readable */

@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .welcome,
  .taskbar {
    background: var(--raised);
  }
}

/* Wide screens: the welcome window on the left, the bay window to its right */

@media (min-width: 64rem) {
  .desktop {
    min-height: clamp(42rem, 46vw, 72rem);
    background: var(--wallpaper) calc(50% + 10vw) 51% / calc(100% + 20vw) auto no-repeat, var(--surface);
  }

  .hero {
    padding-block: var(--space-8) clamp(3rem, 6vw, 5rem);
  }
}

/* Tablets and phones */

@media (max-width: 56rem) {
  .download {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 48rem) {
  .nav-extra {
    display: none;
  }

  .milestones {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-6);
  }

  .milestones li {
    padding-top: 0;
    padding-left: 36px;
  }

  .milestones li::before {
    top: 5px;
  }

  .milestones li:not(:last-child)::after {
    top: 21px;
    right: auto;
    bottom: calc(-1 * var(--space-6) - 5px);
    left: 7px;
    width: 2px;
    height: auto;
  }
}

@media (max-width: 30rem) {
  .taskbar-tray {
    display: none;
  }

  .specs {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-1);
  }

  .specs dd + dt {
    margin-top: var(--space-3);
  }
}