/* nickelos.dev. Chrome is cold, nickel is warm: ChromeOS's friendly shapes
   and type, plated in warm silver and graphite (see site/DESIGN.md). */

@font-face {
  font-family: "Google Sans Flex";
  src: url("/assets/fonts/GoogleSansFlex-nickelos.woff2") format("woff2");
  font-weight: 300 800;
  font-display: swap;
}
@font-face {
  font-family: "Google Sans Code";
  src: url("/assets/fonts/GoogleSansCode-nickelos.woff2") format("woff2");
  font-weight: 400 600;
  font-display: swap;
}

:root {
  --paper: #f3f1ec;          /* warm nickel white */
  --paper-2: #ebe7df;
  --plate: #e2ddd2;          /* plated sections */
  --rule: #d6cfc2;
  --ink: #22211d;            /* graphite */
  --ink-2: #4a4740;
  --ink-3: #6f6a60;
  --blue: #2f56a0;
  --teal: #22a99c;
  --teal-ink: #11716a;       /* teal dark enough for text */
  --frame-edge: rgba(34, 33, 29, 0.14);
  --shadow: 0 1px 2px rgba(34, 33, 29, 0.08), 0 12px 32px -8px rgba(34, 33, 29, 0.22);
  --term-bg: #202124;
  --term-ink: #e8eaed;
  --radius: 20px;
  --wrap: 1180px;
  --sans: "Google Sans Flex", system-ui, sans-serif;
  --mono: "Google Sans Code", ui-monospace, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1c1b18;
    --paper-2: #23221e;
    --plate: #262520;
    --rule: #3a3832;
    --ink: #ece8df;
    --ink-2: #c9c4b8;
    --ink-3: #9d978a;
    --teal-ink: #5cc9bd;
    --frame-edge: rgba(236, 232, 223, 0.12);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 16px 40px -10px rgba(0, 0, 0, 0.6);
  }
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--sans);
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; height: auto; }
a { color: var(--teal-ink); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
code, pre { font-family: var(--mono); }
code { font-size: 0.92em; padding: 0.08em 0.32em; border-radius: 6px; background: var(--paper-2); }
:focus-visible { outline: 3px solid var(--teal); outline-offset: 3px; border-radius: 4px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 clamp(18px, 4vw, 40px); }

.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper); padding: 8px 14px; border-radius: 999px; z-index: 10; }
.skip:focus { left: 12px; }

/* ---- Masthead ---------------------------------------------------------- */

.masthead {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.2) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.masthead-row { display: flex; align-items: center; gap: 28px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 600; font-size: 1.2rem; font-variation-settings: "ROND" 60; }
.masthead nav { display: flex; gap: 22px; margin-left: auto; }
.masthead nav a { color: var(--ink-2); text-decoration: none; font-size: 0.95rem; }
.masthead nav a:hover { color: var(--ink); }
.chip {
  font: 500 0.75rem/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-2); border: 1px solid var(--rule); border-radius: 999px; padding: 7px 11px;
}
@media (max-width: 760px) { .masthead nav { display: none; } .chip { margin-left: auto; } }

/* ---- Type -------------------------------------------------------------- */

.eyebrow {
  font: 500 0.78rem/1.4 var(--mono); letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-3); margin: 0 0 14px;
}
h1, h2, h3 { font-weight: 600; letter-spacing: -0.015em; margin: 0; font-variation-settings: "ROND" 40; }
h2 { font-size: clamp(1.9rem, 1.2rem + 2.4vw, 3rem); line-height: 1.1; max-width: 22ch; }
h3 { font-size: 1.15rem; }
.intro { color: var(--ink-2); max-width: 62ch; margin: 18px 0 0; font-size: 1.1rem; }

/* The ChromeOS keyword pill, plated: warm silver with a stamped rim. */
.plate {
  padding: 0 0.28em;
  border-radius: 0.5em;
  background: linear-gradient(180deg, #f7f5f0, #d9d3c7);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.7), inset 0 -2px 0 rgba(34, 33, 29, 0.08), 0 0 0 1px var(--rule);
  -webkit-box-decoration-break: clone; box-decoration-break: clone;
}
@media (prefers-color-scheme: dark) {
  .plate { background: linear-gradient(180deg, #3a3832, #2b2a25); box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06), 0 0 0 1px var(--rule); }
}

/* ---- Hero -------------------------------------------------------------- */

.hero { padding: clamp(48px, 8vw, 96px) 0 0; overflow-x: clip; }
.hero h1 {
  font-size: clamp(2.6rem, 1.4rem + 5.6vw, 5.4rem);
  line-height: 1.0; letter-spacing: -0.03em;
  font-variation-settings: "ROND" 50;
  max-width: 13ch;
}
.pried { color: var(--teal-ink); }
.lede { font-size: clamp(1.15rem, 1rem + 0.5vw, 1.35rem); color: var(--ink-2); max-width: 46ch; margin: 22px 0 0; }
.hero-note { margin: 22px 0 0; font-size: 0.98rem; color: var(--ink-3); max-width: 60ch; }

.hero-shot { position: relative; margin-top: clamp(36px, 6vw, 64px); }
/* The stroke passes behind the screenshot: it shows where it comes in at
   the bottom left and where it breaks out at the top right. In
   make-hero-stroke.py's viewBox (1600x1060) the frame is x 100-1500,
   y 160-948. */
.hero-art { position: relative; }
.hero-stroke {
  position: absolute; z-index: 0; pointer-events: none; overflow: visible;
  top: 0; left: -7.1429%; width: 114.2857%;   /* 1600/1400 of the frame */
  transform: translateY(-15.0943%);           /* 160/1060 of its height */
}
.hero-stroke path { animation: rise 1.6s cubic-bezier(.2, .7, .2, 1) 0.15s both; }
@keyframes rise {
  from { clip-path: inset(100% 100% 0 0); }
  to { clip-path: inset(0 0 0 0); }
}
@media (prefers-reduced-motion: reduce) { .hero-stroke path { animation: none; } }

.frame { position: relative; z-index: 1; margin: 0; }
.frame img, .frame > picture {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  outline: 1px solid var(--frame-edge); outline-offset: -1px;
}
.caption, figcaption { font-size: 0.92rem; color: var(--ink-3); margin: 14px 2px 0; max-width: 72ch; }
.hero .caption { position: relative; z-index: 1; }

/* ---- Sections ---------------------------------------------------------- */

.section { padding: clamp(64px, 9vw, 120px) 0; }
.section + .section { border-top: 1px solid var(--rule); }
.section-plated { background: var(--plate); border-top-color: transparent !important; }
.section-plated + .section { border-top-color: transparent; }
.hero + .section { margin-top: clamp(40px, 6vw, 72px); }

/* One statement, set large. */
.statement {
  margin: 0; max-width: 32ch;
  font-size: clamp(1.6rem, 1.1rem + 1.8vw, 2.5rem); line-height: 1.22; font-weight: 500;
  letter-spacing: -0.012em; font-variation-settings: "ROND" 40;
}

/* What changes: four cards, how each part works. */
.features { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 44px; }
.feature { background: var(--paper-2); border: 1px solid var(--rule); border-radius: 16px; padding: 24px 26px 26px; }
.feature h3 { display: flex; align-items: center; gap: 12px; font-size: 1.15rem; }
.feature p { margin: 12px 0 0; color: var(--ink-2); }
.icon {
  flex: none; width: 36px; height: 36px; padding: 7px; border-radius: 10px;
  background: var(--paper); border: 1px solid var(--rule);
  fill: none; stroke: var(--teal-ink); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round;
}
.icon circle { fill: var(--teal-ink); }
@media (max-width: 760px) { .features { grid-template-columns: 1fr; } }

/* Ledger: hairline rows, label left, fact right. */
.ledger { margin: 40px 0 0; border-top: 1px solid var(--rule); }
.ledger > div { display: grid; grid-template-columns: minmax(150px, 0.32fr) 1fr; gap: 12px 40px; padding: 22px 0; border-bottom: 1px solid var(--rule); }
.ledger dt { font-weight: 600; font-size: 1.1rem; font-variation-settings: "ROND" 40; }
.ledger dd { margin: 0; color: var(--ink-2); max-width: 68ch; }
@media (max-width: 700px) { .ledger > div { grid-template-columns: 1fr; } }

/* Screenshots of the apps. */
.shots { display: grid; grid-template-columns: 0.82fr 1.18fr; gap: 28px; margin-top: 44px; align-items: start; }
.shots-stack { display: grid; gap: 28px; }
@media (max-width: 900px) { .shots { grid-template-columns: 1fr; } .shots > .frame:first-child { max-width: 460px; } }

.portals { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0 36px; margin: 52px 0 0; border-top: 1px solid var(--rule); }
.portals > div { padding: 18px 0; border-bottom: 1px solid var(--rule); }
.portals dt { font-weight: 600; font-variation-settings: "ROND" 40; }
.portals dd { margin: 4px 0 0; color: var(--ink-2); font-size: 0.98rem; }
.portals q { quotes: "\201C" "\201D"; }
@media (max-width: 900px) { .portals { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .portals { grid-template-columns: 1fr; } }

/* Terminal. */
.split { display: grid; grid-template-columns: 0.72fr 1.28fr; gap: 48px; align-items: center; }
.split p { color: var(--ink-2); max-width: 52ch; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; } }
.term {
  margin: 0; padding: 26px 26px 30px; border-radius: var(--radius);
  background: var(--term-bg); color: var(--term-ink);
  font-size: clamp(0.8rem, 0.62rem + 0.42vw, 0.92rem); line-height: 1.85; overflow-x: auto;
  box-shadow: var(--shadow);
}
.term .p { color: #81c995; }
.term .c { color: #9aa0a6; }
.term .cursor { display: inline-block; width: 0.6em; height: 1.1em; vertical-align: -0.18em; background: #8ab4f8; }

/* The stack: an exploded view, top of the screen to the kernel. */
.stack { list-style: none; margin: 40px 0 0; padding: 0; display: grid; gap: 8px; }
.stack li {
  display: grid; grid-template-columns: minmax(200px, 0.34fr) 1fr auto; gap: 8px 28px; align-items: baseline;
  padding: 16px 22px 16px 20px; border-radius: 12px; background: var(--paper-2);
  border: 1px solid var(--rule); border-left: 4px solid var(--ink-3);
}
.stack li:has(.from-patched) { border-left-color: var(--blue); }
.stack li:has(.from-nickel) { border-left-color: var(--teal); }
.stack .layer { font-weight: 600; font-variation-settings: "ROND" 40; }
.stack .what { color: var(--ink-2); font-size: 0.98rem; }
.stack .from { font: 500 0.72rem/1 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3); white-space: nowrap; }
.stack .from-patched { color: var(--blue); }
.stack .from-nickel { color: var(--teal-ink); }
@media (prefers-color-scheme: dark) { .stack .from-patched { color: #8fb0e8; } }
@media (max-width: 760px) {
  .stack li { grid-template-columns: 1fr; }
}

/* Machines. */
.machines { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 40px; }
.machine { background: var(--paper); border-radius: var(--radius); padding: 26px 24px 28px; border: 1px solid var(--rule); }
.machine h3 { font-family: var(--mono); font-weight: 600; letter-spacing: 0.02em; font-size: 1.05rem; }
.machine .spec { font-size: 0.9rem; color: var(--ink-3); margin: 6px 0 14px; }
.machine p:last-child { margin: 0; color: var(--ink-2); }
@media (max-width: 900px) { .machines { grid-template-columns: 1fr; } }

/* Status board. */
.board { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0 32px; margin-top: 40px; }
.board .col { border-top: 3px solid var(--rule); padding-top: 18px; }
.board .col-done { border-top-color: var(--teal); }
.board .col-doing { border-top-color: var(--blue); }
.board .col-not { border-top-color: var(--ink-3); }
.board ul { list-style: none; margin: 14px 0 0; padding: 0; }
.board li { padding: 10px 0; border-bottom: 1px solid var(--rule); color: var(--ink-2); font-size: 0.98rem; }
@media (max-width: 900px) { .board { grid-template-columns: 1fr; gap: 36px; } }

/* Why. */
.why { display: grid; grid-template-columns: 1fr 1fr; gap: 20px 56px; }
.why h2 { grid-column: 1; }
.why-text { grid-column: 2; grid-row: 1 / span 2; color: var(--ink-2); font-size: 1.1rem; }
.why-text p:first-child { margin-top: 0; }
.values { grid-column: 1; list-style: none; padding: 0; margin: 18px 0 0; display: flex; flex-wrap: wrap; gap: 10px; }
.values li { border: 1px solid var(--rule); border-radius: 999px; padding: 7px 14px; font-size: 0.95rem; }
@media (max-width: 900px) {
  .why { grid-template-columns: 1fr; }
  .why-text, .values { grid-column: 1; grid-row: auto; }
}

/* ---- Footer ------------------------------------------------------------ */

.footer { border-top: 1px solid var(--rule); padding: 40px 0 56px; background: var(--paper-2); }
.footer-row { display: grid; grid-template-columns: auto 1fr; gap: 24px 56px; align-items: start; }
.footer-brand { display: flex; gap: 14px; align-items: center; }
.footer-brand p { margin: 0; }
.small { font-size: 0.86rem; color: var(--ink-3); }
.footer-notes p { margin: 0 0 8px; max-width: 80ch; }
@media (max-width: 700px) { .footer-row { grid-template-columns: 1fr; } }