/* theinterest.app - one stylesheet. No web fonts, no script, nothing loaded from elsewhere.
   Colours are the Daylight direction's tokens (docs/design-directions.md, web/prototype-daylight.html):
   plum, amber, sky, coral, mint on paper. Every interactive piece is CSS - radio buttons, check
   boxes, <details> - and every animation stops for anyone who asked their device for less motion. */

:root {
  --plum: #35193f;
  --plum-soft: #553367;
  --plum-deep: #23102b;
  --amber: #fbb417;
  --amber-soft: #fef4dd;
  --amber-ink: #7a5405;
  --sky: #58aeee;
  --sky-soft: #e7f3fd;
  --sky-ink: #1b6ca8;
  --coral: #f4736b;
  --coral-soft: #fdecea;
  --coral-ink: #a83a33;
  --mint: #4fc1a0;
  --mint-soft: #e4f7f1;
  --mint-ink: #1e7a61;
  --paper: #fbf8f5;
  --surface: #ffffff;
  --ink: #2a2230;
  --ink-2: #6c6174;
  --hairline: #e9e0e5;
  --link: var(--sky-ink);
  --on-plum: #d6c6df;
  --chosen-bg: var(--plum);
  --chosen-ink: #ffffff;
  --r-sm: 12px;
  --r-md: 20px;
  --r-lg: 26px;
  --shadow: 0 4px 18px rgba(74, 44, 86, .07);
  --shadow-lift: 0 14px 36px rgba(74, 44, 86, .15);
  --measure: 70ch;
  --font: ui-rounded, "SF Pro Rounded", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #160e1a;
    --surface: #21182a;
    --ink: #f4eef6;
    --ink-2: #b8acc2;
    --hairline: #33273d;
    --link: #8cc8f5;
    --amber-soft: rgba(251, 180, 23, .15);
    --amber-ink: #ffd36e;
    --sky-soft: rgba(88, 174, 238, .16);
    --sky-ink: #8cc8f5;
    --coral-soft: rgba(244, 115, 107, .16);
    --coral-ink: #ffa59f;
    --mint-soft: rgba(79, 193, 160, .16);
    --mint-ink: #7fdcc0;
    --shadow: 0 4px 18px rgba(0, 0, 0, .25);
    --shadow-lift: 0 14px 36px rgba(0, 0, 0, .4);
    /* Plum on near-black is too faint to read as chosen: the chosen chip turns light instead. */
    --chosen-bg: #f4eef6;
    --chosen-ink: #2a2230;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.65 var(--font);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--amber); outline-offset: 3px; border-radius: 6px; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip {
  position: absolute; left: -999px; top: 8px; z-index: 20;
  background: var(--surface); color: var(--ink); padding: 8px 14px; border-radius: 10px;
}
.skip:focus { left: 8px; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 22px; }

/* ------------------------------------------------------------------ plum bands and their glow */

.masthead {
  position: relative; isolation: isolate; overflow: hidden;
  background: var(--plum); color: #fff;
  border-radius: 0 0 36px 36px;
}
/* Daylight's amber glow in the top corner, a coral one below, a hint of sky - drifting slowly. */
.masthead::before,
.masthead::after,
.glow {
  content: ""; position: absolute; z-index: -1; border-radius: 50%; pointer-events: none;
}
.masthead::before {
  width: 720px; height: 720px; top: -340px; right: -220px;
  background: radial-gradient(circle, rgba(251, 180, 23, .32), transparent 66%);
  animation: drift-a 19s ease-in-out infinite alternate;
}
.masthead::after {
  width: 640px; height: 640px; bottom: -380px; left: -220px;
  background: radial-gradient(circle, rgba(244, 115, 107, .26), transparent 66%);
  animation: drift-b 23s ease-in-out infinite alternate;
}
.glow {
  width: 520px; height: 520px; top: 18%; left: 28%;
  background: radial-gradient(circle, rgba(88, 174, 238, .14), transparent 68%);
  animation: drift-a 27s ease-in-out infinite alternate-reverse;
}
@keyframes drift-a { to { transform: translate(-70px, 50px) scale(1.12); } }
@keyframes drift-b { to { transform: translate(80px, -40px) scale(1.08); } }

.top .wrap {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 6px 18px; min-height: 68px; padding-top: 10px; padding-bottom: 10px;
}
.top nav { display: flex; flex-wrap: wrap; gap: 4px 22px; font-size: 15px; font-weight: 600; }
.top nav a { color: var(--on-plum); text-decoration: none; }
.top nav a:hover, .top nav a[aria-current="page"] { color: #fff; text-decoration: underline; }

.wordmark {
  font-weight: 800; letter-spacing: -.02em; font-size: 23px; color: #fff; text-decoration: none;
  white-space: nowrap;
}
.wordmark .c { color: var(--coral); }
.wordmark .a { color: var(--amber); }
.wordmark .s { color: var(--sky); }

/* ------------------------------------------------------------------ home hero */

.hero { text-align: center; padding: 64px 0 96px; }
.badge {
  display: inline-flex; align-items: center; gap: 10px; margin: 0 0 26px;
  padding: 8px 16px; border-radius: 999px; font-weight: 700; font-size: 15px; color: #fff;
  background: rgba(255, 255, 255, .1); border: 1px solid rgba(255, 255, 255, .22);
}
.badge .dot {
  width: 9px; height: 9px; border-radius: 50%; background: var(--amber);
  box-shadow: 0 0 0 0 rgba(251, 180, 23, .6); animation: pulse 2.4s ease-out infinite;
}
@keyframes pulse { 70%, 100% { box-shadow: 0 0 0 10px rgba(251, 180, 23, 0); } }

.hero h1 {
  font-size: clamp(40px, 7.4vw, 76px); line-height: 1.02; letter-spacing: -.04em;
  font-weight: 800; margin: 0 auto 22px; max-width: 15ch;
}
.gradient-text {
  background: linear-gradient(95deg, var(--amber) 0%, var(--coral) 52%, var(--sky) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede {
  font-size: clamp(18px, 2.3vw, 22px); color: var(--on-plum); max-width: 40ch;
  margin: 0 auto 30px; line-height: 1.55;
}
.hero .tags { justify-content: center; margin-bottom: 34px; }
.hero .tags li { animation: float 6s ease-in-out infinite; }
.hero .tags li:nth-child(2) { animation-delay: -1.2s; }
.hero .tags li:nth-child(3) { animation-delay: -2.4s; }
.hero .tags li:nth-child(4) { animation-delay: -3.6s; }
.hero .tags li:nth-child(5) { animation-delay: -4.8s; }
@keyframes float { 50% { transform: translateY(-6px); } }

.actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 13px 24px; border-radius: 999px;
  font-weight: 800; font-size: 16px; text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, background-color .18s ease;
}
.btn-primary { background: var(--sky); color: #06263d; box-shadow: 0 8px 24px rgba(88, 174, 238, .35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(88, 174, 238, .45); }
.btn-ghost { color: #fff; border: 1px solid rgba(255, 255, 255, .32); }
.btn-ghost:hover { background: rgba(255, 255, 255, .1); }

/* ------------------------------------------------------------------ hashtag chips */

.tags { display: flex; flex-wrap: wrap; gap: 9px; margin: 0; padding: 0; list-style: none; }
.tags li { display: inline-block; padding: 7px 16px; border-radius: 999px; font-weight: 700; font-size: 16px; }
/* Dark text on every accent: white fails on amber and mint. */
.t-amber { background: var(--amber); color: #3d2a02; }
.t-sky { background: var(--sky); color: #06263d; }
.t-coral { background: var(--coral); color: #4a100c; }
.t-mint { background: var(--mint); color: #0c3a2d; }

/* ------------------------------------------------------------------ sections */

section { padding: 84px 0; }
.eyebrow {
  margin: 0 0 10px; font-size: 13px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase;
  color: var(--coral-ink);
}
section h2 {
  font-size: clamp(30px, 4.2vw, 44px); letter-spacing: -.03em; line-height: 1.1; margin: 0 0 14px;
}
.section-lede { color: var(--ink-2); font-size: 19px; max-width: 52ch; margin: 0 0 40px; }
.center { text-align: center; }
.center .section-lede { margin-left: auto; margin-right: auto; }

/* Content rises in as it scrolls into view - where the browser can do that without script. */
@supports (animation-timeline: view()) {
  .reveal {
    animation: reveal linear both;
    animation-timeline: view();
    animation-range: entry 0% cover 28%;
  }
}
@keyframes reveal { from { opacity: 0; transform: translateY(28px); } }

/* ------------------------------------------------------------------ try it */

.try { border: 0; margin: 0; padding: 0; min-width: 0; }
.try legend { font-weight: 800; font-size: 15px; letter-spacing: .02em; color: var(--ink-2); margin: 0 auto 14px; padding: 0; }
.picker { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-bottom: 30px; }
.picker label {
  cursor: pointer; padding: 10px 20px; border-radius: 999px; font-weight: 800; font-size: 17px;
  background: var(--surface); color: var(--ink); border: 2px solid var(--hairline);
  transition: transform .15s ease, background-color .15s ease, border-color .15s ease;
  user-select: none;
}
.picker label:hover { transform: translateY(-2px); border-color: var(--ink-2); }

.panel {
  max-width: 780px; margin: 0 auto; background: var(--surface); border: 1px solid var(--hairline);
  border-radius: var(--r-lg); box-shadow: var(--shadow-lift); padding: 22px; text-align: left;
}
.panel-head { display: flex; justify-content: space-between; align-items: center; gap: 10px 12px; margin-bottom: 16px; flex-wrap: wrap; }
.count { margin: 0; font-weight: 800; display: none; }
.radius { font-size: 14px; font-weight: 700; color: var(--ink-2); background: var(--paper); padding: 5px 12px; border-radius: 999px; }
.feed { display: grid; gap: 14px; }
@media (min-width: 680px) { .feed { grid-template-columns: 1fr 1fr; } }
.post {
  display: none; border: 1px solid var(--hairline); border-radius: var(--r-md); padding: 16px;
  background: var(--paper); animation: rise .35s ease both;
}
.post + .post { animation-delay: .07s; }
/* Movement only: content never depends on an animation running to be visible. */
@keyframes rise { from { transform: translateY(12px); } }
.post-head { display: flex; gap: 11px; align-items: center; margin-bottom: 10px; }
.avatar {
  width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; flex: none;
  font-weight: 800; font-size: 16px;
}
.av-sky { background: var(--sky-soft); color: var(--sky-ink); }
.av-coral { background: var(--coral-soft); color: var(--coral-ink); }
.av-mint { background: var(--mint-soft); color: var(--mint-ink); }
.av-amber { background: var(--amber-soft); color: var(--amber-ink); }
.who { display: grid; line-height: 1.3; }
.who strong { font-size: 16px; }
.who span { color: var(--ink-2); font-size: 14px; }
.post-text { margin: 0 0 12px; font-size: 17px; line-height: 1.45; }
.post .tags { margin-bottom: 14px; gap: 6px; }
.post .tags li { font-size: 13px; padding: 4px 11px; }
.send {
  display: block; text-align: center; cursor: pointer; padding: 10px; border-radius: var(--r-sm);
  font-weight: 800; background: var(--sky); color: #06263d;
  transition: background-color .2s ease, transform .15s ease; user-select: none;
}
.send:hover { transform: translateY(-1px); }
.send .done { display: none; }
.post input:checked + .send { background: var(--mint); color: #0c3a2d; }
.post input:checked + .send .idle { display: none; }
.post input:checked + .send .done { display: inline; }
.post input:focus-visible + .send { outline: 3px solid var(--amber); outline-offset: 3px; }
.note { margin: 14px 0 0; font-size: 14px; color: var(--ink-2); text-align: center; }

/* One rule per hashtag: the checked one lights its chip and shows its posts. Radio buttons and
   the sibling selector - every browser, no script. */
#t-coffee:checked ~ .picker [for="t-coffee"],
#t-chess:checked ~ .picker [for="t-chess"],
#t-running:checked ~ .picker [for="t-running"],
#t-espanol:checked ~ .picker [for="t-espanol"],
#t-piano:checked ~ .picker [for="t-piano"],
#t-climbing:checked ~ .picker [for="t-climbing"] {
  background: var(--chosen-bg); color: var(--chosen-ink); border-color: var(--chosen-bg);
  transform: translateY(-2px); box-shadow: 0 8px 20px rgba(53, 25, 63, .28);
}
#t-coffee:focus-visible ~ .picker [for="t-coffee"],
#t-chess:focus-visible ~ .picker [for="t-chess"],
#t-running:focus-visible ~ .picker [for="t-running"],
#t-espanol:focus-visible ~ .picker [for="t-espanol"],
#t-piano:focus-visible ~ .picker [for="t-piano"],
#t-climbing:focus-visible ~ .picker [for="t-climbing"] { outline: 3px solid var(--amber); outline-offset: 3px; }
#t-coffee:checked ~ .panel .coffee,
#t-chess:checked ~ .panel .chess,
#t-running:checked ~ .panel .running,
#t-espanol:checked ~ .panel .espanol,
#t-piano:checked ~ .panel .piano,
#t-climbing:checked ~ .panel .climbing { display: block; }

/* ------------------------------------------------------------------ how it works */

.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 30px; position: relative; }
@media (min-width: 900px) {
  .steps { grid-template-columns: repeat(4, 1fr); gap: 26px; }
  .steps::before {
    content: ""; position: absolute; top: 27px; left: 9%; right: 9%; height: 3px; border-radius: 3px;
    background: linear-gradient(90deg, var(--sky), var(--amber), var(--coral), var(--mint)); opacity: .55;
  }
}
.steps li { position: relative; }
.num {
  position: relative; display: grid; place-items: center; width: 56px; height: 56px; border-radius: 50%;
  font-weight: 800; font-size: 22px; margin-bottom: 18px; box-shadow: 0 0 0 6px var(--paper);
}
.n-sky { background: var(--sky); color: #06263d; }
.n-amber { background: var(--amber); color: #3d2a02; }
.n-coral { background: var(--coral); color: #4a100c; }
.n-mint { background: var(--mint); color: #0c3a2d; }
.steps h3 { margin: 0 0 6px; font-size: 21px; letter-spacing: -.01em; }
.steps p { margin: 0; color: var(--ink-2); }

/* ------------------------------------------------------------------ cards */

.band { background: var(--surface); border-block: 1px solid var(--hairline); }
.grid { display: grid; gap: 18px; grid-template-columns: 1fr; margin: 0; padding: 0; list-style: none; }
@media (min-width: 640px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }
.card {
  background: var(--paper); border: 1px solid var(--hairline); border-radius: var(--r-lg);
  padding: 26px; transition: transform .2s ease, box-shadow .2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lift); }
.card h3 { margin: 0 0 8px; font-size: 20px; letter-spacing: -.01em; line-height: 1.3; }
.card p { margin: 0; color: var(--ink-2); font-size: 16.5px; }
.icon { display: grid; place-items: center; width: 50px; height: 50px; border-radius: 15px; margin-bottom: 16px; }
.icon svg { width: 26px; height: 26px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.i-sky { background: var(--sky-soft); color: var(--sky-ink); }
.i-coral { background: var(--coral-soft); color: var(--coral-ink); }
.i-mint { background: var(--mint-soft); color: var(--mint-ink); }
.i-amber { background: var(--amber-soft); color: var(--amber-ink); }

/* ------------------------------------------------------------------ questions */

.faq { max-width: 780px; margin: 0 auto; display: grid; gap: 12px; text-align: left; }
.faq details {
  background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--r-md);
  box-shadow: var(--shadow); transition: box-shadow .2s ease;
}
.faq details[open] { box-shadow: var(--shadow-lift); }
.faq summary {
  cursor: pointer; list-style: none; padding: 20px 64px 20px 24px; font-weight: 800; font-size: 18px;
  position: relative; border-radius: var(--r-md);
}
.faq summary::-webkit-details-marker { display: none; }
/* A plus that turns into a cross when the answer is open. */
.faq summary::after {
  content: ""; position: absolute; right: 22px; top: 50%; width: 28px; height: 28px; margin-top: -14px;
  border-radius: 50%; background-color: var(--sky-soft);
  background-image: linear-gradient(var(--sky-ink), var(--sky-ink)), linear-gradient(var(--sky-ink), var(--sky-ink));
  background-size: 12px 2px, 2px 12px; background-position: center; background-repeat: no-repeat;
  transition: transform .2s ease;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin: 0; padding: 0 24px 22px; color: var(--ink-2); }

/* ------------------------------------------------------------------ closing band and footer */

/* The closing band carries the footer, so its glow runs to the bottom of the page. */
.closing { border-radius: 36px 36px 0 0; }
.closing::before { top: -380px; }
.closing section { text-align: center; padding: 88px 0 60px; }
.closing h2 { font-size: clamp(30px, 4.4vw, 46px); letter-spacing: -.03em; line-height: 1.1; margin: 0 auto 16px; max-width: 18ch; }
.closing p { color: var(--on-plum); font-size: 18px; margin: 0 auto 6px; }
.closing a { color: #bfe1fa; }

footer { background: var(--plum-deep); color: var(--on-plum); padding: 30px 0 40px; font-size: 15px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 28px; justify-content: space-between; align-items: center; }
footer nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }
footer a { color: #fff; }
.closing footer { background: transparent; padding-top: 0; }
.closing footer .wrap { border-top: 1px solid rgba(255, 255, 255, .14); padding-top: 26px; }

/* ------------------------------------------------------------------ documents */

.page-head { padding: 26px 0 60px; }
/* The title lines up with the text below it, not with the wider header. */
.wrap.page-head { max-width: calc(var(--measure) + 44px); }
.page-head h1 { font-size: clamp(34px, 5.4vw, 52px); letter-spacing: -.035em; line-height: 1.08; margin: 0 0 8px; }
.page-head .meta { color: var(--on-plum); margin: 0; font-size: 16px; }
.doc { padding: 48px 0 76px; }
.doc .wrap { max-width: calc(var(--measure) + 44px); }
.doc h2 { font-size: 25px; letter-spacing: -.015em; margin: 44px 0 10px; line-height: 1.3; }
.doc h3 { font-size: 19px; margin: 26px 0 6px; }
.doc ul, .doc ol { padding-left: 1.3em; }
.doc li { margin: 5px 0; }
.summary {
  background: var(--surface); border: 1px solid var(--hairline); border-radius: var(--r-lg);
  padding: 8px 26px 12px; margin: 0 0 8px; box-shadow: var(--shadow);
}
.summary h2 { margin-top: 18px; }
.callout {
  border-left: 4px solid var(--amber); background: var(--amber-soft);
  padding: 14px 20px; border-radius: 0 var(--r-sm) var(--r-sm) 0; margin: 18px 0;
}
.table-scroll { overflow-x: auto; margin: 14px 0; border: 1px solid var(--hairline); border-radius: var(--r-md); }
table { border-collapse: collapse; width: 100%; font-size: 15.5px; background: var(--surface); }
th, td { text-align: left; vertical-align: top; padding: 12px 14px; border-bottom: 1px solid var(--hairline); }
tr:last-child td { border-bottom: 0; }
th { font-size: 12px; letter-spacing: .09em; text-transform: uppercase; color: var(--ink-2); background: var(--paper); }
.toc { columns: 2 260px; column-gap: 44px; padding-left: 1.3em; margin: 0 0 8px; }
.toc li { break-inside: avoid; }

/* ------------------------------------------------------------------ the opt-in screens */

.phone {
  width: 320px; max-width: 100%; margin: 24px auto; border-radius: 40px; padding: 14px;
  background: #0d0a11; box-shadow: 0 18px 50px rgba(20, 8, 30, .28);
}
.phone .screen {
  background: var(--plum); color: #fff; border-radius: 28px; padding: 28px 22px 26px;
  font-size: 15px; line-height: 1.5;
}
.phone h4 { font-size: 24px; letter-spacing: -.02em; margin: 6px 0 6px; }
.phone .sub { color: rgba(255, 255, 255, .78); margin: 0 0 18px; }
.phone .field {
  background: #fff; color: #2a2230; border-radius: 14px; padding: 12px 14px; font-size: 18px;
  font-weight: 600; margin-bottom: 14px;
}
.phone .fine { font-size: 12.5px; color: rgba(255, 255, 255, .78); margin: 0 0 16px; }
.phone .fine a { color: #bfe1fa; }
.phone .btn-mock {
  background: var(--sky); color: #06263d; text-align: center; font-weight: 800; border-radius: 14px;
  padding: 13px;
}
.phone .check { display: flex; gap: 10px; align-items: flex-start; font-size: 13.5px; margin: 0 0 16px; }
.phone .box {
  flex: none; width: 20px; height: 20px; border-radius: 6px; background: var(--sky); color: #06263d;
  font-weight: 900; font-size: 14px; line-height: 20px; text-align: center; margin-top: 1px;
}
.phone-row { display: grid; gap: 8px 24px; grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr)); }
.phone-row figure { margin: 0; }
.caption { text-align: center; color: var(--ink-2); font-size: 14px; margin-top: -8px; }

/* A text message, as it arrives. */
.bubble {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: 20px 20px 20px 6px; padding: 12px 16px; white-space: pre-line;
  max-width: 46ch; margin: 10px 0 18px; font-size: 16px; box-shadow: var(--shadow);
}

@media (max-width: 560px) {
  body { font-size: 16.5px; }
  .top nav { gap: 4px 16px; font-size: 14px; }
  .hero { padding: 40px 0 70px; }
  section { padding: 60px 0; }
  .masthead { border-radius: 0 0 26px 26px; }
  .closing { border-radius: 26px 26px 0 0; }
}

/* Less motion, when asked for: nothing drifts, floats, pulses, rises or lifts. */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .card:hover, .btn-primary:hover, .picker label:hover, .send:hover { transform: none; }
}