/* Entropic Software Labs. Tokens match offbridge.app: dark first, light by OS or toggle. */

:root {
  color-scheme: dark;
  --bg: #141414;
  --card: #1F1F1F;
  --surface: #2A2A2A;
  --text: #F5F5F5;
  --text-2: #A3A3A3;
  --text-3: #909090;
  --hairline: rgba(255, 255, 255, .08);
  --hairline-strong: rgba(255, 255, 255, .14);
  --accent: #22C55E;
  --accent-text: #4ADE88;
  --accent-on: #06210F;
  --accent-muted: rgba(34, 197, 94, .14);
  --warn: #FBBF24;
  --shadow-btn: 0 6px 16px -8px rgba(0, 0, 0, .55);
  --shadow-shot: 0 24px 60px -16px rgba(0, 0, 0, .7);

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-pill: 999px;
  --gutter: clamp(16px, 5vw, 48px);
  --section: clamp(4rem, 3rem + 5vw, 7rem);
  --serif: "Noto Serif", Georgia, "Times New Roman", Times, "Liberation Serif", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    color-scheme: light;
    --bg: #F8FAFC;
    --card: #FFFFFF;
    --surface: #F1F5F9;
    --text: #0F172A;
    --text-2: #475569;
    --text-3: #64748B;
    --hairline: rgba(15, 23, 42, .08);
    --hairline-strong: rgba(15, 23, 42, .14);
    --accent: #34D399;
    --accent-text: #047857;
    --accent-on: #042F1C;
    --accent-muted: rgba(52, 211, 153, .16);
    --warn: #B45309;
    --shadow-btn: 0 6px 16px -8px rgba(15, 23, 42, .14);
    --shadow-shot: 0 24px 60px -16px rgba(15, 23, 42, .18);
  }
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #F8FAFC;
  --card: #FFFFFF;
  --surface: #F1F5F9;
  --text: #0F172A;
  --text-2: #475569;
  --text-3: #64748B;
  --hairline: rgba(15, 23, 42, .08);
  --hairline-strong: rgba(15, 23, 42, .14);
  --accent: #34D399;
  --accent-text: #047857;
  --accent-on: #042F1C;
  --accent-muted: rgba(52, 211, 153, .16);
  --warn: #B45309;
  --shadow-btn: 0 6px 16px -8px rgba(15, 23, 42, .14);
  --shadow-shot: 0 24px 60px -16px rgba(15, 23, 42, .18);
}

/* Theme-dependent elements: show only the one that matches the active theme. */
.on-dark { display: block; }
.on-light { display: none; }

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .on-dark { display: none; }
  :root:not([data-theme="dark"]) .on-light { display: block; }
}

:root[data-theme="light"] .on-dark { display: none; }
:root[data-theme="light"] .on-light { display: block; }

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scrollbar-color: var(--surface) var(--bg);
}

::selection {
  background: var(--accent);
  color: var(--accent-on);
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3 {
  margin: 0;
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 1.05;
}

h1 { font-size: clamp(2.4rem, 1.2rem + 5vw, 4.5rem); }
h2 { font-size: clamp(1.8rem, 1.3rem + 2vw, 2.6rem); }

p { margin: 0; }

a {
  color: var(--accent-text);
  text-underline-offset: 3px;
}

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

.container {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

/* Top bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  height: 64px;
  background: var(--bg);
  border-bottom: 1px solid var(--hairline);
}

.topbar-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  white-space: nowrap;
}

.mark {
  width: 28px;
  height: 28px;
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: var(--r-sm);
  color: var(--accent-text);
}

.mark svg { width: 16px; height: 16px; display: block; }

/* The wordmark shortens where the full nav (or a narrow phone) leaves no room for it. */
@media (max-width: 419px), (min-width: 640px) and (max-width: 799px) {
  .brand-rest { display: none; }
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  color: var(--text-2);
  text-decoration: none;
  border-radius: var(--r-sm);
}

.nav-link:hover,
.nav-link[aria-current="page"] { color: var(--text); }

.nav-link svg {
  width: 12px;
  height: 12px;
  flex: none;
  margin-left: 4px;
}

.nav-compact { display: none; }

@media (max-width: 639px) {
  .nav-full { display: none; }
  .nav-compact { display: inline-flex; }
}

.theme-toggle {
  position: relative;
  width: 40px;
  height: 40px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-md);
  cursor: pointer;
}

/* Extends the hit area to 44px without changing the 40px look. */
.theme-toggle::before {
  content: "";
  position: absolute;
  inset: -2px;
}

.theme-toggle:hover { background: var(--surface); }

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding-block: clamp(3rem, 2rem + 5vw, 6rem) clamp(2.5rem, 2rem + 3vw, 4.5rem);
}

.hero .container {
  position: relative;
  z-index: 1;
}

/* Home hero: centered, fills the first screen. */
.hero-home {
  min-height: calc(100svh - 64px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
}

.hero-mark {
  display: flex;
  width: 56px;
  height: 56px;
  margin: 0 auto 2rem;
  border-radius: var(--r-md);
}

.hero-mark svg { width: 28px; height: 28px; }

.hero-home h1 {
  max-width: 18ch;
  margin-inline: auto;
  font-size: clamp(2.6rem, 1.4rem + 5.2vw, 5.25rem);
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.hero-home .lead {
  max-width: 40ch;
  margin-inline: auto;
}

.hero-home .actions { justify-content: center; }

/* Typed headline: js/site.js wraps each character in .tc and moves the caret. */
.typed { position: relative; }

/* Hidden until js/site.js splits it into characters. The delayed animation is a failsafe if the script never runs. */
.motion .typed-text:not(.split) {
  opacity: 0;
  animation: esl-show 0s linear 2.5s forwards;
}

@keyframes esl-show {
  to { opacity: 1; }
}

.tw { white-space: nowrap; }

.motion .tc { opacity: 0; }

.motion .tc.on {
  opacity: 1;
  transition: opacity 80ms linear;
}

.typed-caret {
  position: absolute;
  top: 0;
  left: 0;
  width: 0.08em;
  height: 0.9em;
  background: var(--accent);
  transform: translate(var(--cx, 0px), var(--cy, 0px));
  pointer-events: none;
  animation: esl-blink 1s steps(1) infinite;
}

.typed-caret.typing { animation: none; }

.typed-caret.gone {
  animation: none;
  opacity: 0;
  transition: opacity 500ms ease;
}

@keyframes esl-blink {
  50% { opacity: 0; }
}

/* Entropy field: canvas drawn by js/field.js, fades out toward the bottom edge. */
canvas.field {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  display: block;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to bottom, #000 70%, transparent);
  mask-image: linear-gradient(to bottom, #000 70%, transparent);
}

/* Hero intro: the lead settles in once the headline is being typed. */
@keyframes esl-rise {
  from { opacity: .25; transform: translateY(14px); filter: blur(6px); }
  to { opacity: 1; transform: none; filter: none; }
}

@media (prefers-reduced-motion: no-preference) {
  .hero-home .lead {
    animation: esl-rise 900ms cubic-bezier(.16, 1, .3, 1) 1.2s both;
  }
}

.lead {
  margin-top: 1.5rem;
  max-width: 38ch;
  color: var(--text-2);
  font-size: clamp(1.05rem, .98rem + .45vw, 1.3rem);
  line-height: 1.55;
}

/* Home sections and product-page sections share one rhythm: a hairline, then generous space. */
.statement,
.principles,
.steps,
.detail,
.apps {
  padding-block: var(--section);
  border-top: 1px solid var(--hairline);
}

.statement p {
  max-width: 30ch;
  font-size: clamp(1.6rem, 1rem + 2.6vw, 3rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.motion .fill .fw {
  color: var(--text-3);
  transition: color 200ms;
}

.motion .fill .fw.lit { color: var(--text); }

.principles-list,
.steps-list {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
}

.principles-list li,
.steps-list li {
  min-width: 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--hairline-strong);
}

.principles h3,
.steps h3 {
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.principles li p,
.steps li p {
  margin-top: 0.5rem;
  color: var(--text-2);
}

.steps-list { counter-reset: step; }

.steps-list li { counter-increment: step; }

.steps-list li::before {
  content: counter(step);
  display: block;
  margin-bottom: 0.5rem;
  color: var(--accent-text);
  font-size: 2.75rem;
  font-weight: 400;
  line-height: 1;
}

.detail .facts {
  max-width: 40rem;
  margin-top: 2rem;
}

/* Apps */
.apps {
  padding-bottom: 0;
  scroll-margin-top: 64px;
}

.apps .project:first-of-type {
  padding-top: clamp(2rem, 1.5rem + 2vw, 3rem);
  border-top: 0;
}

.project-name {
  font-size: clamp(1.8rem, 1.3rem + 2vw, 2.6rem);
}

/* Product hero: text left, media right. */
.product-hero {
  overflow: visible;
  padding-block: clamp(2.5rem, 2rem + 4vw, 5rem);
}

.product-hero .container {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.5rem;
  align-items: center;
}

.product-hero .lead { margin-top: 0; }

/* Projects */
.project {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2.5rem;
  padding-block: var(--section);
  border-top: 1px solid var(--hairline);
  scroll-margin-top: 64px;
}

.project-text { min-width: 0; max-width: 34rem; }

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 1.1rem 0 1.4rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 3px 12px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-pill);
  color: var(--text-2);
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 500;
  line-height: 1.5;
}

.chip-status {
  background: var(--accent-muted);
  border-color: transparent;
  color: var(--accent-text);
}

.chip-warn {
  background: var(--surface);
  border-color: transparent;
  color: var(--warn);
}

.project .project-text > p:not(.small) { font-size: 1.05rem; }

.facts {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
  color: var(--text-2);
}

.facts li {
  position: relative;
  padding-left: 22px;
  font-size: 0.98rem;
}

.facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(0.8em - 3px);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.small {
  margin-top: 1.5rem;
  color: var(--text-3);
  font-size: 0.9rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 1.75rem;
}

.actions:empty { display: none; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: transform .12s ease, filter .12s ease, background-color .12s ease;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-on);
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover { filter: brightness(1.06); }
.btn-primary:active { transform: scale(.97); }

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--hairline-strong);
}

.btn-secondary:hover { filter: brightness(1.06); }
.btn-secondary:active { transform: scale(.97); }

/* Media */
.media { min-width: 0; }

/* OffBridge: Windows window with the Android screen over its lower-right corner. */
.media-offbridge {
  position: relative;
  width: 100%;
  aspect-ratio: 100 / 95;
}

.shot-win {
  position: absolute;
  top: 0;
  left: 0;
  width: 88%;
  height: auto;
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-shot);
}

.shot-phone {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 34%;
  height: auto;
  border: 1px solid var(--hairline-strong);
  border-radius: 18px;
  box-shadow: var(--shadow-shot);
}

/* Quick Vote: phone frame. */
.media-phone { display: flex; justify-content: center; }

.phone-shot {
  width: 100%;
  max-width: 300px;
  aspect-ratio: 1080 / 2050;
  object-fit: cover;
  object-position: top;
  border: 1px solid var(--hairline-strong);
  border-radius: 28px;
  box-shadow: var(--shadow-shot);
}

/* Schedule: widget mock-up in HTML. */
.mock {
  max-width: 380px;
  margin-inline: auto;
}

.widget {
  position: relative;
  z-index: 1;
  padding: 22px;
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: 24px;
  box-shadow: var(--shadow-shot);
}

.widget-title {
  margin-bottom: 16px;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.3;
}

.widget-rows {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.widget-rows li {
  display: flex;
  align-items: center;
  gap: 12px;
}

.bar {
  flex: none;
  align-self: stretch;
  width: 4px;
  min-height: 24px;
  border-radius: 2px;
  background: var(--accent);
}

.time {
  flex: none;
  color: var(--text-2);
  font-family: var(--sans);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.widget-foot {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--hairline);
  color: var(--text-2);
  font-size: 0.88rem;
}

.month {
  width: 68%;
  margin: 16px 0 0 auto;
  padding: 14px;
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: 18px;
  box-shadow: var(--shadow-shot);
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 5px;
}

.cell {
  position: relative;
  aspect-ratio: 1;
  border-radius: 6px;
  background: var(--surface);
}

.cell.empty { background: transparent; }

.cell.dot::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 6px;
  height: 6px;
  margin: -3px 0 0 -3px;
  border-radius: 50%;
  background: var(--accent);
}

.cell.today { background: var(--accent); }

/* Footer */
.footer {
  border-top: 1px solid var(--hairline);
  color: var(--text-3);
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 12px;
  padding-block: 20px;
}

.footer a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--text-2);
}

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

/* 404 */
.notfound {
  padding-block: clamp(4rem, 3rem + 8vw, 9rem);
  min-height: calc(100vh - 64px - 90px);
}

.notfound p { margin: 1.25rem 0 2rem; color: var(--text-2); font-size: 1.15rem; }

/* Live chip: a status dot with a slow ring. No offset shadow here, it is a status mark. */
.chip-live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.chip-live::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

@keyframes esl-pulse {
  from { box-shadow: 0 0 0 0 var(--accent-muted); }
  to { box-shadow: 0 0 0 6px transparent; }
}

@media (prefers-reduced-motion: no-preference) {
  .chip-live::before { animation: esl-pulse 2s ease-out infinite; }
}

/* Tilt: transform is set from js/site.js on fine pointers. */
.media {
  transform-style: preserve-3d;
  transition: transform 600ms cubic-bezier(.16, 1, .3, 1);
}

.media.tilting { transition: none; }

/* Scroll reveals. html.motion is added by js/site.js, so without JS everything stays fully visible.
   Start states are dimmed, never invisible. */
.motion .project-text {
  transition: opacity 700ms cubic-bezier(.16, 1, .3, 1), transform 700ms cubic-bezier(.16, 1, .3, 1);
  transition-delay: 120ms;
}

.motion .project-text:not(.in) {
  opacity: .35;
  transform: translateY(16px);
}

/* Principles and steps rise in, a beat apart. */
.motion .principles li,
.motion .steps-list li {
  transition: opacity 700ms cubic-bezier(.16, 1, .3, 1), transform 700ms cubic-bezier(.16, 1, .3, 1);
}

.motion .principles li:nth-child(2),
.motion .steps-list li:nth-child(2) { transition-delay: 80ms; }

.motion .principles li:nth-child(n+3),
.motion .steps-list li:nth-child(n+3) { transition-delay: 160ms; }

.motion .principles li:not(.in),
.motion .steps-list li:not(.in) {
  opacity: .35;
  transform: translateY(16px);
}

/* OffBridge: the phone joins the PC. */
.motion .media-offbridge .shot-win {
  transition: opacity 900ms cubic-bezier(.16, 1, .3, 1), transform 900ms cubic-bezier(.16, 1, .3, 1);
}

.motion .media-offbridge .shot-phone {
  transition: opacity 900ms cubic-bezier(.16, 1, .3, 1), transform 900ms cubic-bezier(.16, 1, .3, 1);
  transition-delay: 150ms;
}

.motion .media-offbridge.tilting .shot-phone { transition: none; }

.motion .media-offbridge:not(.in) .shot-phone {
  transform: translate(18%, 10%) rotate(4deg);
  opacity: .3;
}

.motion .media-offbridge:not(.in) .shot-win {
  opacity: .5;
  transform: scale(.97);
}

/* Quick Vote: the screen draws down from the top. The clip box is padded so the shadow is not cut off once revealed. */
.motion .media-phone .phone-shot {
  clip-path: inset(-40px -80px -120px -80px round 28px);
  transition: clip-path 1000ms cubic-bezier(.16, 1, .3, 1), opacity 1000ms cubic-bezier(.16, 1, .3, 1), transform 1000ms cubic-bezier(.16, 1, .3, 1);
}

.motion .media-phone:not(.in) .phone-shot {
  clip-path: inset(0 0 55% 0 round 28px);
  opacity: .5;
  transform: translateY(24px);
}

/* Schedule: rows slide in one after another, then today lights up. */
.motion .media-schedule .widget-rows li {
  transition: opacity 600ms cubic-bezier(.16, 1, .3, 1), transform 600ms cubic-bezier(.16, 1, .3, 1);
}

.motion .media-schedule .widget-rows li:nth-child(2) { transition-delay: 90ms; }
.motion .media-schedule .widget-rows li:nth-child(3) { transition-delay: 180ms; }

.motion .media-schedule:not(.in) .widget-rows li {
  opacity: .2;
  transform: translateX(-12px);
}

.motion .media-schedule .cell.today {
  transition: background-color 600ms cubic-bezier(.16, 1, .3, 1) 400ms;
}

.motion .media-schedule:not(.in) .cell.today { background: var(--surface); }

/* Desktop: two columns, alternating sides */
@media (min-width: 900px) {
  .project {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: clamp(2.5rem, 6vw, 5rem);
    align-items: center;
  }

  .project:nth-of-type(even) {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  }

  .project:nth-of-type(even) .media { order: 2; }

  .product-hero .container {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: clamp(2.5rem, 6vw, 5rem);
  }

  .principles-list,
  .steps-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
    scroll-behavior: auto !important;
  }

  .btn-primary:active, .btn-secondary:active { transform: none; }
}