/* Swiss interface for the Number Bases lesson. */

[data-theme="light"] {
  --bg: #f2efe6;
  --bg-2: #e8e4da;
  --bg-3: #dcd7cb;
  --ink: #111111;
  --ink-2: #3f3e3a;
  --ink-3: #6b6860;
  --rule: #b9b4a8;
  --rule-2: #111111;
  --phosphor: #c52218;
  --phosphor-dim: #a81711;
  --phosphor-glow: rgba(197, 34, 24, 0.12);
  --signal-warn: #9b4f00;
  --signal-stop: #c51f18;
  --bg-card: #f8f6ef;
  --bg-card-hover: #ffffff;
  --shadow: rgba(17, 17, 17, 0.18);
  --cell-rgb: 197,34,24;
  --neg-rgb: 17,17,17;
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #111111;
  --bg-2: #1d1d1b;
  --bg-3: #292825;
  --ink: #f2efe6;
  --ink-2: #cbc7bd;
  --ink-3: #969187;
  --rule: #44413b;
  --rule-2: #f2efe6;
  --phosphor: #ff493d;
  --phosphor-dim: #ff6d64;
  --phosphor-glow: rgba(255, 73, 61, 0.14);
  --signal-warn: #f5a623;
  --signal-stop: #ff493d;
  --bg-card: #181816;
  --bg-card-hover: #232320;
  --shadow: rgba(0, 0, 0, 0.42);
  --cell-rgb: 255,73,61;
  --neg-rgb: 242,239,230;
  color-scheme: dark;
}

:root {
  --face-display: "Helvetica Neue", "Neue Haas Grotesk Text Pro", Helvetica, Arial, sans-serif;
  --face-body: "Helvetica Neue", "Neue Haas Grotesk Text Pro", Helvetica, Arial, sans-serif;
  --face-clock: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --face-mono: "SFMono-Regular", "Roboto Mono", Menlo, Consolas, monospace;
  --orange: var(--phosphor);
  --amber: var(--phosphor-dim);
  --text: var(--ink);
  --text-2: var(--ink-2);
  --text-3: var(--ink-3);
  --border: var(--rule);
  --border-strong: var(--ink);
  --border-hover: var(--phosphor);
}

* {
  border-radius: 0;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--face-body);
  letter-spacing: -0.008em;
}

button,
input {
  font-family: var(--face-body);
}

:focus-visible {
  outline: 3px solid var(--phosphor);
  outline-offset: 3px;
}

::selection {
  background: var(--phosphor);
  color: #fff;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 1rem;
  z-index: 5000;
  padding: 0.75rem 1rem;
  background: var(--phosphor);
  color: #fff;
  font-family: var(--face-mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
  transform: translateY(-120%);
}

.skip-link:focus {
  transform: translateY(0);
}

.scroll-progress {
  height: 5px;
  background: var(--phosphor);
}

.nav {
  height: 4.25rem;
  padding: 0 clamp(1rem, 3vw, 2.5rem);
  border: 0;
  border-bottom: 5px solid var(--phosphor);
  background: #111111;
  color: #f2efe6;
}

.nav-back {
  min-height: 2.6rem;
  display: inline-flex;
  align-items: center;
  padding: 0 0.65rem;
  border: 1px solid #45423d;
  color: #d3cfc5;
  font-family: var(--face-mono);
  font-size: 0.65rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-back:hover {
  border-color: var(--phosphor);
  background: var(--phosphor);
  color: #fff;
}

.nav-title {
  display: grid;
  gap: 0.08rem;
  color: #f2efe6;
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.08em;
}

.nav-title small {
  color: #87837b;
  font-family: var(--face-mono);
  font-size: 0.5rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.theme-btn {
  min-height: 2.6rem;
  padding: 0 0.75rem;
  border: 1px solid #45423d;
  border-radius: 0;
  color: #d3cfc5;
  font-family: var(--face-mono);
  font-size: 0.6rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.theme-btn:hover {
  border-color: #f2efe6;
  background: #f2efe6;
  color: #111111;
}

.main-layout {
  background: var(--bg);
}

.sim-area {
  flex-basis: 57%;
  border-bottom: 2px solid var(--ink);
  background: var(--bg);
}

.sim-area.sim-expanded {
  flex-basis: 69%;
}

.canvas-wrap {
  background-image:
    linear-gradient(to right, color-mix(in srgb, var(--ink) 7%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in srgb, var(--ink) 7%, transparent) 1px, transparent 1px);
  background-size: 3rem 3rem;
}

.canvas-wrap::after {
  content: none;
  position: absolute;
  top: 0.75rem;
  right: 1rem;
  color: var(--phosphor);
  font-family: var(--face-mono);
  font-size: 0.52rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.info-bar {
  min-height: 3.25rem;
  padding: 0.35rem 1rem;
  border-top: 1px solid var(--ink);
  background: var(--bg-2);
}

.controls-bar {
  height: 4.25rem;
  gap: 0.5rem;
  padding: 0 1rem;
  border-top: 0;
  background: #111111;
}

.scene-area {
  background: var(--bg);
}

.scene {
  padding: 1.5rem clamp(1rem, 5vw, 5rem);
  transition-duration: 300ms;
}

.scene::before {
  content: none;
  display: block;
  width: max-content;
  margin-bottom: 0.75rem;
  padding-top: 0.4rem;
  border-top: 5px solid var(--phosphor);
  color: var(--ink-3);
  font-family: var(--face-mono);
  font-size: 0.52rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.scene-body {
  gap: 1rem;
}

.scene-text {
  max-width: 52rem;
  color: var(--ink-2);
  font-size: clamp(1.05rem, 2.2vw, 1.45rem);
  line-height: 1.45;
  letter-spacing: -0.02em;
}

.scene-text strong {
  color: var(--ink);
  font-weight: 750;
}

.scene-footer {
  min-height: 3.5rem;
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--ink);
}

.scene-num {
  padding: 0.35rem 0.5rem;
  background: var(--phosphor);
  color: #fff;
  font-family: var(--face-mono);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.btn-continue,
.btn-start {
  min-height: 3.25rem;
  padding: 0.7rem 1.25rem;
  border: 2px solid var(--phosphor);
  border-radius: 0;
  background: var(--phosphor);
  box-shadow: none;
  color: #fff;
  font-family: var(--face-body);
  font-size: 0.72rem;
  font-weight: 750;
  line-height: 1;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  transition: background-color 130ms ease, border-color 130ms ease, color 130ms ease;
}

.btn-continue:not([data-locked="true"]):hover,
.btn-start:hover {
  border-color: var(--ink);
  background: var(--ink);
  box-shadow: none;
  color: var(--bg);
}

.btn-continue[data-locked="true"] {
  border-color: var(--rule);
  background: transparent;
  color: var(--ink-3);
  opacity: 1;
  cursor: not-allowed;
}

.btn-fill,
.btn-start .btn-fill {
  background: color-mix(in srgb, #fff 22%, transparent);
}

.btn-back,
.btn-pause {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 0.75rem;
  border: 1px solid var(--ink);
  border-radius: 0;
  color: var(--ink-2);
  font-family: var(--face-mono);
  font-size: 0.62rem;
  font-weight: 650;
  text-transform: uppercase;
}

.btn-pause {
  width: 2.75rem;
  padding: 0;
}

.btn-back:hover,
.btn-pause:hover {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--bg);
}

.dot-btn,
.preset-btn,
.adj-btn,
.phi-reveal-btn,
.pg-special-btn {
  min-height: 2.75rem;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--phosphor);
  border-radius: 0;
  background: transparent;
  color: var(--phosphor);
  font-family: var(--face-mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.dot-btn:hover,
.preset-btn:hover,
.adj-btn:hover,
.phi-reveal-btn:hover,
.pg-special-btn:hover,
.preset-btn.active,
.pg-special-btn.active {
  border-color: var(--phosphor);
  background: var(--phosphor);
  color: #fff;
}

.dot-btn:active,
.adj-btn:active {
  transform: translateY(1px);
}

.slider-wrap,
.pg-slider-wrap {
  gap: 0.25rem;
}

.base-slider,
.sbs-slider,
.pg-slider,
.trig-slider {
  accent-color: var(--phosphor);
}

.base-slider::-webkit-slider-thumb,
.sbs-slider::-webkit-slider-thumb,
.pg-slider::-webkit-slider-thumb {
  border: 2px solid #111111;
  background: var(--phosphor);
  box-shadow: none;
}

.base-label,
.slider-marker,
.slider-neg-label,
.pg-lbl,
.sbs-lbl {
  color: #bcb8af;
  font-family: var(--face-mono);
  font-size: 0.58rem;
  letter-spacing: 0.06em;
}

.digit-readout {
  gap: 0.45rem;
}

.digit-lbl {
  color: var(--ink-3);
  font-family: var(--face-mono);
  font-size: 0.58rem;
}

.digit-val {
  color: var(--ink);
  font-family: var(--face-display);
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 750;
}

.decomp-line {
  color: var(--ink-2);
  font-family: var(--face-mono);
  font-size: 0.65rem;
}

.sbs-panel,
.neg-result,
.negone-result,
.frac-result,
.roman-result,
.phi-info,
.aside-note,
.neg-intro-example,
.irr-row {
  border: 1px solid var(--ink);
  border-radius: 0;
  background: var(--bg-card);
  box-shadow: none;
}

.sbs-canvas-wrap,
.phi-canvas-wrap,
.pg-canvas-wrap,
.ka-canvas-wrap,
.complex-canvas-wrap,
.cp-intro-canvas-wrap,
.trig-canvas-wrap,
.sqrti-canvas-wrap {
  border: 1px solid var(--ink);
  border-radius: 0;
  background: var(--bg-2);
}

.irr-input {
  border: 2px solid var(--ink);
  border-radius: 0;
  background: var(--bg);
  color: var(--ink);
}

.irr-input:focus {
  border-color: var(--phosphor);
}

.neg-repr,
.negone-repr,
.frac-repr,
.phi-repr,
.complex-repr,
.irr-repr,
.roman-big,
.ka-note strong {
  color: var(--phosphor);
}

#titleSlide {
  align-items: start;
  justify-content: center;
  padding: clamp(3rem, 7vw, 7rem) clamp(1rem, 6vw, 6rem);
  overflow: hidden;
  background: var(--bg);
  text-align: left;
}

#titleSlide::before {
  content: "";
  position: absolute;
  top: 0;
  right: 8%;
  bottom: 0;
  width: clamp(4rem, 14vw, 12rem);
  background: var(--phosphor);
}

#titleSlide::after {
  content: "01 / 22";
  position: absolute;
  right: calc(8% + 1rem);
  bottom: 1rem;
  color: #fff;
  font-family: var(--face-mono);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.title-heading,
.title-sub,
.title-author,
.btn-start {
  position: relative;
  z-index: 1;
}

.title-heading {
  margin: 0;
  color: var(--ink);
  font-family: var(--face-display);
  font-size: clamp(6rem, 20vw, 18rem);
  font-weight: 750;
  line-height: 0.72;
  letter-spacing: -0.085em;
  text-transform: uppercase;
}

.title-sub {
  max-width: 36rem;
  margin: clamp(2rem, 6vh, 4rem) 0 0;
  color: var(--ink);
  font-family: var(--face-body);
  font-size: clamp(1.25rem, 2.5vw, 2.15rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.title-author {
  margin: 1rem 0 2rem;
  color: var(--ink-3);
  font-family: var(--face-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

@media (max-width: 700px) {
  .nav {
    height: 3.75rem;
  }

  .nav-title small {
    display: none;
  }

  .nav-back {
    border: 0;
    padding: 0;
  }

  .theme-btn {
    min-height: 2.25rem;
    padding: 0 0.45rem;
  }

  #titleSlide {
    padding-top: 4rem;
  }

  #titleSlide::before {
    right: 1rem;
    width: 2.25rem;
  }

  #titleSlide::after {
    right: 1.35rem;
    writing-mode: vertical-rl;
  }

  .title-heading {
    font-size: clamp(5rem, 27vw, 9rem);
  }

  .title-sub {
    max-width: calc(100% - 3.5rem);
  }

  .sim-area {
    flex-basis: 50%;
  }

  .sim-area.sim-expanded {
    flex-basis: 60%;
  }

  .controls-bar {
    height: auto;
    min-height: 3.75rem;
    flex-wrap: wrap;
    padding: 0.4rem;
  }

  .scene {
    padding: 1rem;
  }

  .scene::before {
    display: none;
  }

  .scene-footer {
    gap: 0.5rem;
  }

  .btn-continue {
    padding: 0.6rem 0.8rem;
  }

  .scene-num {
    display: none;
  }

  .slider-inner {
    width: min(12rem, 55vw);
  }
}

@media (prefers-reduced-motion: reduce) {
  .scene {
    transition-duration: 1ms;
  }
}