/* Sketchpad Redux: the console.
 *
 * A dark room, an enamelled console, a phosphor tube. The console is dark by
 * design in either colour scheme: it is a piece of 1963 hardware, and the
 * phosphor only reads against black.
 */

:root {
  color-scheme: dark;

  --room: #0c0e0d;
  --room-glow: #1b201d;
  --enamel-hi: #353b37;
  --enamel: #2a2f2b;
  --seam: #141715;
  --engrave: #c4c0ae;
  --engrave-dim: #8f8c7e;
  --ink: #e9e5d6;

  --button-hi: #4b524d;
  --button-lo: #343a36;
  --guard-hi: #5c3f38;
  --guard-lo: #432f2a;

  --lamp-off: #3a302a;
  --lamp-on: #ffb44a;
  --lamp-glow: rgba(255, 168, 56, 0.55);
  --green-on: #9fe27c;
  --green-glow: rgba(140, 226, 110, 0.5);

  --bezel-hi: #2b302c;
  --bezel-lo: #101211;
  --face-center: #1c241f;
  --face-mid: #121814;
  --face-edge: #090c0a;

  --font-plate: "Futura", "Century Gothic", "Avenir Next", "Trebuchet MS", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --font-text: -apple-system, "Segoe UI", system-ui, sans-serif;

  --gutter: 16px;
}

* {
  box-sizing: border-box;
}

/* Hidden means hidden, whatever display a class gives (`.chip` is inline-flex). */
[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  background: var(--room);
}

body {
  min-height: 100dvh;
  padding: max(var(--gutter), env(safe-area-inset-top)) max(var(--gutter), env(safe-area-inset-right))
    max(var(--gutter), env(safe-area-inset-bottom)) max(var(--gutter), env(safe-area-inset-left));
  background: radial-gradient(ellipse 80% 60% at 50% 35%, var(--room-glow), var(--room) 70%) fixed;
  color: var(--ink);
  font-family: var(--font-text);
  display: flex;
  flex-direction: column;
  gap: 14px;
  /* A console, not a page: long presses and drags don't select its labels.
     The guide is reading matter, so it can be selected. */
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

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

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

.nameplate h1 {
  margin: 0;
  font: 500 clamp(18px, 2.2vw, 24px) / 1 var(--font-plate);
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--ink);
}

.nameplate .tag {
  display: inline-block;
  margin-left: 0.3em;
  padding: 0.28em 0.5em 0.22em 0.65em;
  border: 1px solid currentColor;
  border-radius: 3px;
  font-size: 0.5em;
  letter-spacing: 0.28em;
  color: var(--lamp-on);
  vertical-align: 0.35em;
}

.nameplate p {
  margin: 6px 0 0;
  font: 11px / 1.3 var(--font-plate);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--engrave-dim);
}

.masthead-nav {
  display: flex;
  gap: 8px;
}

.chip {
  appearance: none;
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 14px;
  border: 1px solid #3c423e;
  border-radius: 999px;
  background: linear-gradient(var(--enamel-hi), var(--enamel));
  color: var(--engrave);
  font: 600 11px / 1 var(--font-plate);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
}

.chip:hover {
  color: var(--ink);
  border-color: #59615b;
}

.chip:focus-visible,
.pb:focus-visible,
.knob:focus-visible {
  outline: 2px solid var(--lamp-on);
  outline-offset: 3px;
}

/* ---------- Console layout ---------- */

.console {
  flex: 1;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "display"
    "buttons"
    "knobs"
    "indicators";
  align-items: start;
}

@media (min-width: 1000px) {
  .console {
    grid-template-columns: 196px minmax(0, 1fr) 196px;
    grid-template-rows: auto 1fr;
    grid-template-areas:
      "buttons display indicators"
      "buttons knobs indicators";
  }
}

.buttons {
  grid-area: buttons;
}

.display {
  grid-area: display;
}

.knobs {
  grid-area: knobs;
}

.indicators {
  grid-area: indicators;
}

.panel {
  padding: 14px;
  border: 1px solid var(--seam);
  border-radius: 12px;
  background: linear-gradient(var(--enamel-hi), var(--enamel));
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.06),
    0 10px 30px rgba(0, 0, 0, 0.45);
}

.engraved {
  margin: 0 0 10px;
  font: 600 10.5px / 1.2 var(--font-plate);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--engrave-dim);
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.6);
}

/* ---------- Lamps ---------- */

.lamp {
  display: inline-block;
  flex: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #5c4c40, var(--lamp-off));
  box-shadow: inset 0 0 2px rgba(0, 0, 0, 0.8);
  transition: background 80ms, box-shadow 80ms;
}

.lit > .lamp,
.lamp.lit {
  background: radial-gradient(circle at 35% 35%, #fff4d8, var(--lamp-on) 45%, #c26d16);
  box-shadow: 0 0 8px 2px var(--lamp-glow);
}

.lamp.green.lit {
  background: radial-gradient(circle at 35% 35%, #f0ffe6, var(--green-on) 45%, #4f9a33);
  box-shadow: 0 0 8px 2px var(--green-glow);
}

/* ---------- Push buttons ---------- */

.button-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

@media (min-width: 1000px) {
  .button-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.pb {
  appearance: none;
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr auto;
  justify-items: center;
  align-items: center;
  gap: 5px;
  min-height: 74px;
  padding: 9px 6px 7px;
  border: 1px solid #1a1d1b;
  border-radius: 7px;
  background: linear-gradient(var(--button-hi), var(--button-lo));
  box-shadow:
    0 3px 0 #141715,
    0 5px 12px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.13);
  color: var(--engrave);
  font: 600 10.5px / 1.15 var(--font-plate);
  letter-spacing: 0.13em;
  text-transform: uppercase;
  text-align: center;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-touch-callout: none;
  user-select: none;
  -webkit-user-select: none;
  transition: transform 60ms, box-shadow 60ms;
}

.pb:hover {
  color: var(--ink);
}

.pb:active,
.pb.pushed {
  transform: translateY(2px);
  box-shadow:
    0 1px 0 #141715,
    0 2px 6px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.pb.lit {
  color: var(--ink);
}

/* A button waiting for the pen: its lamp blinks. */
.pb.waiting {
  color: var(--ink);
}

.pb.waiting > .lamp {
  animation: lamp-blink 0.9s steps(2, jump-none) infinite;
}

@keyframes lamp-blink {
  from {
    background: radial-gradient(circle at 35% 35%, #fff4d8, var(--lamp-on) 45%, #c26d16);
    box-shadow: 0 0 8px 2px var(--lamp-glow);
  }
  to {
    background: radial-gradient(circle at 35% 35%, #5c4c40, var(--lamp-off));
    box-shadow: inset 0 0 2px rgba(0, 0, 0, 0.8);
  }
}

.pb-guarded {
  background: linear-gradient(var(--guard-hi), var(--guard-lo));
}

.pb kbd,
.pb-hint {
  font: 500 10px / 1 var(--font-mono);
  letter-spacing: 0;
  text-transform: none;
  color: var(--engrave-dim);
}

/* ---------- The display ---------- */

.display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.bezel {
  width: min(100%, max(300px, calc(100dvh - 300px)));
  padding: clamp(10px, 2vw, 22px);
  border-radius: 22px;
  background: linear-gradient(145deg, var(--bezel-hi), var(--bezel-lo));
  box-shadow:
    inset 0 2px 0 rgba(255, 255, 255, 0.06),
    inset 0 -3px 8px rgba(0, 0, 0, 0.6),
    0 20px 46px rgba(0, 0, 0, 0.65);
}

.face {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 7%;
  background: radial-gradient(ellipse at 50% 46%, var(--face-center) 0%, var(--face-mid) 55%, var(--face-edge) 100%);
  box-shadow:
    inset 0 0 44px rgba(0, 0, 0, 0.85),
    inset 0 0 4px rgba(0, 0, 0, 0.9);
  cursor: none;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.face:focus {
  outline: none;
}

.face:focus-visible {
  box-shadow:
    inset 0 0 44px rgba(0, 0, 0, 0.85),
    inset 0 0 0 1px rgba(255, 180, 74, 0.4);
}

.face canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.crt-afterglow {
  mix-blend-mode: screen;
}

.crt-bloom {
  filter: blur(3px);
  mix-blend-mode: screen;
  opacity: 0.9;
}

/* The glass: a soft reflection, and the tube darkening toward its edges. */
.face::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background:
    radial-gradient(ellipse 55% 35% at 28% 16%, rgba(255, 255, 255, 0.06), transparent 70%),
    radial-gradient(ellipse at 50% 50%, transparent 62%, rgba(0, 0, 0, 0.38) 100%);
}

.status {
  width: min(100%, max(300px, calc(100dvh - 300px)));
  min-height: 3.2em;
  margin: 0;
  padding: 9px 13px;
  border-radius: 7px;
  background: #101311;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.75);
  color: var(--engrave);
  font: 12.5px / 1.45 var(--font-mono);
}

/* ---------- Knobs ---------- */

.knobs {
  width: 100%;
  justify-self: center;
}

@media (min-width: 1000px) {
  .knobs {
    width: min(100%, max(300px, calc(100dvh - 300px)));
  }
}

.knob-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  justify-items: center;
}

.knob-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.knob-unit .engraved {
  margin: 0;
}

.knob {
  position: relative;
  width: clamp(54px, 13vw, 68px);
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle, transparent 0 60%, rgba(0, 0, 0, 0.55) 61% 64%, transparent 65%),
    repeating-conic-gradient(#2c2c2c 0 5deg, #171717 5deg 10deg);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.6);
  cursor: grab;
  touch-action: none;
  -webkit-touch-callout: none;
}

.knob:active {
  cursor: grabbing;
}

.knob-cap {
  position: absolute;
  inset: 13%;
  border-radius: 50%;
  background: radial-gradient(circle at 38% 30%, #444, #141414 70%);
  box-shadow:
    0 3px 6px rgba(0, 0, 0, 0.6),
    inset 0 1px 1px rgba(255, 255, 255, 0.16);
}

.knob-cap::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 9%;
  width: 3px;
  height: 30%;
  margin-left: -1.5px;
  border-radius: 2px;
  background: #e6e2d3;
}

/* ---------- Indicators ---------- */

.indicators {
  display: grid;
  gap: 4px;
}

.lamps {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font: 600 10.5px / 1 var(--font-plate);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--engrave);
}

.lamps li {
  display: flex;
  align-items: center;
  gap: 7px;
}

@media (min-width: 1000px) {
  .lamps {
    flex-direction: column;
  }
}

.counters {
  margin: 0 0 12px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

@media (min-width: 1000px) {
  .counters {
    grid-template-columns: 1fr;
  }
}

.counters > div {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

@media (min-width: 1000px) {
  .counters > div {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.counters dt {
  font: 600 10px / 1 var(--font-plate);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--engrave-dim);
}

.counters dd {
  margin: 0;
  min-width: 4.5em;
  padding: 4px 8px;
  border-radius: 3px;
  background: #0b0d0c;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.8);
  color: var(--lamp-on);
  font: 600 14px / 1.1 var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
  text-shadow: 0 0 6px var(--lamp-glow);
}

.saved {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 0;
  font: 600 10.5px / 1 var(--font-plate);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--engrave-dim);
}

/* Which version this is: small, like a maker's plate. */
.version {
  margin: 0;
  font: 10px / 1.3 var(--font-plate);
  letter-spacing: 0.12em;
  color: var(--engrave-dim);
}

.guide .version {
  margin-top: 14px;
  font-size: 12px;
  color: var(--engrave-dim);
}

/* ---------- Guide ---------- */

.guide {
  width: min(640px, calc(100vw - 2 * var(--gutter)));
  max-height: calc(100dvh - 2 * var(--gutter));
  padding: 0;
  border: 1px solid #3c423e;
  border-radius: 14px;
  background: linear-gradient(var(--enamel-hi), var(--enamel));
  color: var(--ink);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.7);
  user-select: text;
  -webkit-user-select: text;
}

.guide::backdrop {
  background: rgba(5, 6, 6, 0.72);
  backdrop-filter: blur(2px);
}

.guide form {
  padding: 22px 24px 20px;
}

.guide h2 {
  margin: 0 0 10px;
  font: 500 17px / 1.2 var(--font-plate);
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.guide h3 {
  margin: 18px 0 6px;
  font: 600 11px / 1.2 var(--font-plate);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lamp-on);
}

.guide p,
.guide li {
  font-size: 14px;
  line-height: 1.55;
  color: #d9d5c6;
}

.guide .lede {
  margin: 0;
  color: var(--engrave);
}

.guide ul {
  margin: 0;
  padding-left: 1.1em;
}

.guide li + li {
  margin-top: 4px;
}

.guide b {
  color: var(--ink);
  font-weight: 600;
}

.guide kbd {
  padding: 1px 5px;
  border: 1px solid #4a514c;
  border-radius: 4px;
  background: #1c201d;
  font: 12px var(--font-mono);
}

.guide .note {
  margin: 18px 0 0;
  padding: 10px 12px;
  border-radius: 8px;
  background: #1a1e1b;
  color: var(--engrave);
}

.guide-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 18px;
}

.guide-actions a {
  color: var(--engrave);
  font-size: 14px;
}

@media (prefers-reduced-motion: reduce) {
  .pb,
  .lamp {
    transition: none;
  }

  .pb.waiting > .lamp {
    animation: none;
    background: radial-gradient(circle at 35% 35%, #ffe2a8, #b8823d);
  }
}

/* ---------- Touch screens ----------
 * Instructions and hints that only make sense for one kind of pointer. Key
 * letters on the buttons mean nothing without a keyboard. */

.only-touch {
  display: none;
}

@media (hover: none) and (pointer: coarse) {
  .only-touch {
    display: revert;
  }

  .only-mouse,
  .pb kbd {
    display: none;
  }
}

/* ---------- Phones, upright: the display and buttons on one screen ---------- */

@media (max-width: 600px) {
  body {
    gap: 10px;
  }

  .nameplate p {
    display: none;
  }

  .nameplate h1 {
    font-size: 17px;
  }

  .chip {
    min-height: 30px;
    padding: 0 11px;
    font-size: 10px;
  }

  .console {
    gap: 10px;
  }

  .panel {
    padding: 10px;
  }

  .button-grid {
    gap: 8px;
  }

  .pb {
    min-height: 54px;
    padding: 7px 4px 6px;
  }

  .status {
    min-height: 2.9em;
    padding: 7px 10px;
    font-size: 12px;
  }
}

/* ---------- Phones, on their side: buttons | display | status and knobs ---------- */

@media (orientation: landscape) and (max-height: 540px) {
  body {
    gap: 8px;
    padding-top: max(10px, env(safe-area-inset-top));
    padding-bottom: max(10px, env(safe-area-inset-bottom));
  }

  .nameplate p {
    display: none;
  }

  .nameplate h1 {
    font-size: 15px;
  }

  .chip {
    min-height: 28px;
    padding: 0 10px;
    font-size: 10px;
  }

  .console {
    gap: 10px;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    grid-template-rows: auto auto 1fr;
    grid-template-areas:
      "buttons bezel status"
      "buttons bezel knobs"
      "buttons bezel .";
  }

  /* Let the bezel and status line take their own places in the grid. */
  .display {
    display: contents;
  }

  .bezel {
    grid-area: bezel;
    align-self: start;
    width: calc(100dvh - 80px);
    padding: 8px;
  }

  .status {
    grid-area: status;
    width: auto;
    font-size: 11.5px;
  }

  .knobs {
    width: auto;
  }

  .knob-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .knob {
    width: 46px;
  }

  .button-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .pb {
    min-height: 50px;
  }

  .indicators {
    display: none;
  }
}