/* Boost Opti website, concept B: black field, fixed-width text, one framed picture of the app.
   Everything is black, white and grey. The only colour on the page is the app's own mint:
   inside its screens, on the live dot, and on a result that got better. One theme, dark, on purpose. */

@font-face { font-family: 'Geist'; src: url('assets/fonts/geist-latin-wght-normal.woff2') format('woff2'); font-weight: 100 900; font-display: swap; }
@font-face { font-family: 'Geist Mono'; src: url('assets/fonts/geist-mono-latin-wght-normal.woff2') format('woff2'); font-weight: 100 900; font-display: swap; }

:root {
  color-scheme: dark;
  --black: #000;
  --panel: #0a0a0a;
  --white: #fff;
  --grey: #a6a6a6;     /* running text */
  --dim: #858585;      /* labels and small print */
  --line: rgba(255, 255, 255, 0.13);
  --line-2: rgba(255, 255, 255, 0.24);
  --mint: #3ddc97;

  --head: 'Geist', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --mono: 'Geist Mono', ui-monospace, 'Cascadia Mono', Consolas, monospace;

  --gutter: clamp(16px, 4vw, 40px);
  --gap: clamp(72px, 10vw, 136px); /* between sections */
}

* { box-sizing: border-box; }
html { background: var(--black); scroll-padding-top: 84px; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body { margin: 0; background: var(--black); color: var(--grey); font: 400 0.9rem/1.7 var(--mono); letter-spacing: -0.01em; -webkit-font-smoothing: antialiased; }
h1, h2, h3, p, ul, ol, dl, dd, figure { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img { display: block; max-width: 100%; height: auto; }
a { color: var(--white); text-underline-offset: 3px; text-decoration-color: var(--line-2); }
a:hover { text-decoration-color: var(--white); }
:focus-visible { outline: 2px solid var(--white); outline-offset: 3px; border-radius: 6px; }
::selection { background: var(--white); color: var(--black); }
h1, h2 { font-family: var(--head); font-weight: 600; color: var(--white); text-wrap: balance; }
h2 { font-size: clamp(1.9rem, 4.2vw, 3.3rem); line-height: 1.04; letter-spacing: -0.04em; }
h3 { font: 500 0.95rem/1.4 var(--mono); color: var(--white); }
b { color: var(--white); font-weight: 500; }
svg.i { width: 1.2em; height: 1.2em; flex: none; }

.wrap { width: min(1160px, 100% - 2 * var(--gutter)); margin-inline: auto; }
.skip { position: absolute; left: 12px; top: -60px; z-index: 10; padding: 10px 14px; background: var(--white); color: var(--black); border-radius: 8px; }
.skip:focus { top: 12px; }
.sub { margin-top: 18px; max-width: 58ch; }

/* ── Top bar ───────────────────────────────────────────────────────────── */

.top { position: sticky; top: 0; z-index: 5; background: rgba(0, 0, 0, 0.72); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
.top-row { display: flex; align-items: center; gap: 28px; height: 64px; font-size: 0.82rem; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--white); text-decoration: none; font: 600 1.02rem/1 var(--head); letter-spacing: -0.02em; }
.top-nav { display: flex; gap: 24px; margin-left: 14px; margin-right: auto; }
.top-nav a, .top-end > a:not(.pill) { color: var(--grey); text-decoration: none; }
.top-nav a:hover, .top-end > a:not(.pill):hover { color: var(--white); }
.top-end { display: flex; align-items: center; gap: 20px; margin-left: auto; }
.pill { padding: 7px 16px; border: 1px solid var(--line-2); border-radius: 999px; color: var(--white); text-decoration: none; transition: background 0.15s, color 0.15s; }
.pill:hover { background: var(--white); color: var(--black); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 14px 24px; border: 1px solid var(--white); border-radius: 12px; background: var(--white); color: var(--black); font: 500 0.98rem/1.2 var(--head); letter-spacing: -0.01em; text-decoration: none; transition: background 0.15s, color 0.15s, border-color 0.15s; }
.btn:hover { background: #d9d9d9; border-color: #d9d9d9; }
.btn-line { background: transparent; border-color: var(--line-2); color: var(--white); }
.btn-line:hover { background: var(--white); border-color: var(--white); color: var(--black); }

.chip { display: inline-flex; align-items: center; gap: 10px; padding: 6px 14px; border: 1px solid var(--line-2); border-radius: 999px; font-size: 0.78rem; line-height: 1.5; color: #d4d4d4; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 0 0 rgba(61, 220, 151, 0.5); }
@media (prefers-reduced-motion: no-preference) {
  .dot { animation: beat 2.4s ease-out infinite; }
  @keyframes beat { 0% { box-shadow: 0 0 0 0 rgba(61, 220, 151, 0.55); } 70%, 100% { box-shadow: 0 0 0 9px rgba(61, 220, 151, 0); } }
}

/* ── Opening ───────────────────────────────────────────────────────────── */

.hero { display: grid; justify-items: center; text-align: center; padding-block: clamp(56px, 9vw, 120px) clamp(44px, 6vw, 72px); }
h1 { margin-top: 26px; font-size: clamp(2.7rem, 7.4vw, 5.9rem); line-height: 1; letter-spacing: -0.048em; }
.lede { margin-top: 26px; max-width: 60ch; font-size: 0.98rem; }
.hero-cta { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 14px 26px; margin-top: 36px; }
.quiet { display: inline-flex; align-items: center; gap: 8px; color: var(--grey); text-decoration: none; }
.quiet:hover { color: var(--white); }
.fine { margin-top: 20px; font-size: 0.78rem; color: var(--dim); }

/* The frame around a picture of the app: light leaking over a dark field, with film grain on top. */
.stage { position: relative; isolation: isolate; overflow: hidden; border: 1px solid var(--line); border-radius: 24px; padding: clamp(14px, 5.2vw, 72px);
  background:
    radial-gradient(58% 85% at 8% 0%, rgba(255, 255, 255, 0.42), transparent 72%),
    radial-gradient(48% 75% at 100% 100%, rgba(255, 255, 255, 0.3), transparent 72%),
    radial-gradient(36% 46% at 72% 6%, rgba(255, 255, 255, 0.1), transparent 72%),
    #0b0b0b; }
.stage::before { content: ''; position: absolute; inset: 0; z-index: -1; background: url('assets/grain.svg'); opacity: 0.5; mix-blend-mode: overlay; }
.stage img { width: 100%; border: 1px solid rgba(255, 255, 255, 0.16); border-radius: clamp(8px, 1.2vw, 14px); box-shadow: 0 40px 90px -30px rgba(0, 0, 0, 0.9), 0 0 0 1px rgba(0, 0, 0, 0.6); }

.pillars { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 28px clamp(20px, 3vw, 44px); margin-top: clamp(40px, 5vw, 64px); }
.pillars li { display: grid; gap: 8px; align-content: start; }
.pillars svg { color: var(--white); margin-bottom: 6px; }
.pillars p { font-size: 0.84rem; }

/* ── Built for ─────────────────────────────────────────────────────────── */

/* A row of choices above one picture as wide as the page. Each choice is a radio button (so the arrow keys
   move between them) with its label drawn as the button; the text and picture of the chosen one are shown. */
.built { margin-top: var(--gap); }
.pick { margin-top: 30px; }
.pick-input { position: absolute; opacity: 0; pointer-events: none; }
.pick-tabs { display: flex; flex-wrap: wrap; gap: 10px; }
.pick-tabs label { display: inline-flex; align-items: center; gap: 10px; padding: 9px 16px; border: 1px solid var(--line-2); border-radius: 999px; color: var(--grey); font-size: 0.84rem; cursor: pointer; transition: background 0.15s, color 0.15s, border-color 0.15s; }
.pick-tabs label:hover { color: var(--white); border-color: var(--white); }
.pick-panel { display: none; }
.pick-panel > p { margin-top: 26px; max-width: 76ch; }
.pick-panel .stage { margin-top: 30px; }
/* The certificate and the care page are web pages, nearly square: shown whole, at a size that suits them. */
.pick-panel .stage.is-page img { width: min(100%, 640px); margin-inline: auto; }
#pc-1:checked ~ .pick-tabs label[for="pc-1"] { background: var(--white); border-color: var(--white); color: var(--black); }
#pc-1:focus-visible ~ .pick-tabs label[for="pc-1"] { outline: 2px solid var(--white); outline-offset: 3px; }
#pc-1:checked ~ .pick-panels #pc-panel-1 { display: block; }
#pc-2:checked ~ .pick-tabs label[for="pc-2"] { background: var(--white); border-color: var(--white); color: var(--black); }
#pc-2:focus-visible ~ .pick-tabs label[for="pc-2"] { outline: 2px solid var(--white); outline-offset: 3px; }
#pc-2:checked ~ .pick-panels #pc-panel-2 { display: block; }
#pc-3:checked ~ .pick-tabs label[for="pc-3"] { background: var(--white); border-color: var(--white); color: var(--black); }
#pc-3:focus-visible ~ .pick-tabs label[for="pc-3"] { outline: 2px solid var(--white); outline-offset: 3px; }
#pc-3:checked ~ .pick-panels #pc-panel-3 { display: block; }
#pc-4:checked ~ .pick-tabs label[for="pc-4"] { background: var(--white); border-color: var(--white); color: var(--black); }
#pc-4:focus-visible ~ .pick-tabs label[for="pc-4"] { outline: 2px solid var(--white); outline-offset: 3px; }
#pc-4:checked ~ .pick-panels #pc-panel-4 { display: block; }
#pc-5:checked ~ .pick-tabs label[for="pc-5"] { background: var(--white); border-color: var(--white); color: var(--black); }
#pc-5:focus-visible ~ .pick-tabs label[for="pc-5"] { outline: 2px solid var(--white); outline-offset: 3px; }
#pc-5:checked ~ .pick-panels #pc-panel-5 { display: block; }
#pc-6:checked ~ .pick-tabs label[for="pc-6"] { background: var(--white); border-color: var(--white); color: var(--black); }
#pc-6:focus-visible ~ .pick-tabs label[for="pc-6"] { outline: 2px solid var(--white); outline-offset: 3px; }
#pc-6:checked ~ .pick-panels #pc-panel-6 { display: block; }

/* ── What other tools walk past ────────────────────────────────────────── */

.finds { margin-top: var(--gap); }
.finds ul { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin-top: 34px; border: 1px solid var(--line); border-radius: 18px; overflow: hidden; }
.finds li { display: grid; gap: 10px; align-content: start; padding: 22px 20px 24px; border-left: 1px solid var(--line); }
.finds li:first-child { border-left: 0; }
.finds svg { color: var(--white); margin-bottom: 6px; }
.finds h3 { font-size: 0.72rem; font-weight: 400; letter-spacing: 0.08em; text-transform: uppercase; color: var(--dim); }
.finds .says { font: 500 1.14rem/1.24 var(--head); letter-spacing: -0.02em; color: var(--white); }
.finds li p:last-child { font-size: 0.82rem; }
.finds > .fine { margin-top: 18px; }

/* ── Proof ─────────────────────────────────────────────────────────────── */

.proof { display: grid; grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr); gap: clamp(28px, 5vw, 72px); align-items: start; margin-top: var(--gap); }
.proof h2 { margin-top: 22px; }
.points { display: grid; gap: 22px; margin-top: 34px; }
.points li { display: grid; gap: 4px; padding-left: 18px; border-left: 1px solid var(--line-2); }
.points p { font-size: 0.86rem; max-width: 52ch; }

.receipt { border: 1px solid var(--line-2); border-radius: 18px; background: var(--panel); padding: clamp(18px, 2.6vw, 30px); font-size: 0.84rem; }
.receipt figcaption { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 4px 16px; padding-bottom: 14px; border-bottom: 1px dashed var(--line-2); font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--dim); }
.receipt figcaption span:first-child { color: var(--white); }
.receipt-line { padding-block: 12px; border-bottom: 1px dashed var(--line-2); font-size: 0.78rem; color: var(--dim); }
.receipt table { width: 100%; border-collapse: collapse; }
.receipt th, .receipt td { padding: 10px 0; text-align: left; vertical-align: top; font-weight: 400; }
.receipt thead th { padding-block: 12px 4px; font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--dim); }
.receipt tbody th { color: var(--white); }
.receipt .n { text-align: right; white-space: nowrap; padding-left: 16px; font-variant-numeric: tabular-nums; color: var(--white); }
.receipt thead .n { color: var(--dim); }
.receipt .res { display: block; font-size: 0.76rem; color: var(--dim); }
.receipt .better { color: var(--mint); }
.receipt-total { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; margin-top: 6px; padding-top: 16px; border-top: 1px dashed var(--line-2); }
.receipt-total dt { font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--dim); }
.receipt-total dd { font: 600 2rem/1.15 var(--head); letter-spacing: -0.03em; color: var(--white); }
.receipt-total dd.better { color: var(--mint); }
.receipt-end { margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--line-2); text-align: center; font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--dim); }

/* ── Not in the box ────────────────────────────────────────────────────── */

.never { margin-top: var(--gap); }
.never ul { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); margin-top: 34px; border: 1px solid var(--line); border-radius: 18px; overflow: hidden; }
.never li { display: grid; gap: 22px; align-content: space-between; min-height: 150px; padding: 20px; border-left: 1px solid var(--line); color: var(--grey); }
.never li:first-child { border-left: 0; }
.never svg { color: var(--white); }
.never s { text-decoration-color: var(--dim); font: 500 1.02rem/1.3 var(--head); letter-spacing: -0.015em; color: #d4d4d4; }

/* ── Pricing ───────────────────────────────────────────────────────────── */

.pricing { margin-top: var(--gap); }
.plans { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; margin-top: 34px; }
.plan { display: flex; flex-direction: column; gap: 18px; padding: clamp(22px, 3vw, 36px); border: 1px solid var(--line-2); border-radius: 20px; background: var(--panel); }
.plan h3 { font-size: 0.74rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--dim); }
.price { color: var(--grey); }
.price b { font: 600 3.3rem/1 var(--head); letter-spacing: -0.045em; color: var(--white); margin-right: 6px; }
.price span { white-space: nowrap; }
.plan ul { display: grid; gap: 10px; margin-bottom: 8px; font-size: 0.86rem; }
.plan li { display: flex; gap: 10px; align-items: flex-start; }
.plan li svg { margin-top: 0.25em; color: var(--white); }
.plan .btn { margin-top: auto; }
.plan-note { font-size: 0.76rem; }
.plan-pro { background: var(--white); border-color: var(--white); color: #3d3d3d; }
.plan-pro h3 { color: #5c5c5c; }
.plan-pro .price { color: #3d3d3d; }
.plan-pro .price b, .plan-pro li svg { color: var(--black); }
.plan-pro .btn { background: var(--black); border-color: var(--black); color: var(--white); }
.plan-pro .btn:hover { background: #2b2b2b; border-color: #2b2b2b; }
.plan-pro .plan-note { color: #5c5c5c; }
.plan-pro :focus-visible { outline-color: var(--black); }

/* ── Questions ─────────────────────────────────────────────────────────── */

.faq { display: grid; grid-template-columns: minmax(0, 0.6fr) minmax(0, 1.4fr); gap: clamp(24px, 5vw, 72px); align-items: start; margin-top: var(--gap); }
.faq-list { border-bottom: 1px solid var(--line); }
.faq-list details { border-top: 1px solid var(--line); }
.faq-list summary { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 18px 2px; cursor: pointer; list-style: none; color: var(--white); font-size: 0.98rem; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: '+'; color: var(--dim); font-size: 1.1rem; line-height: 1; }
.faq-list details[open] summary::after { content: '\2212'; }
.faq-list details p { padding: 0 2px 22px; font-size: 0.86rem; max-width: 66ch; }

.closing { display: grid; justify-items: center; gap: 30px; margin-top: var(--gap); padding-block: clamp(48px, 8vw, 104px); text-align: center; }
.closing h2 { font-size: clamp(2rem, 5vw, 3.9rem); }

/* ── Foot ──────────────────────────────────────────────────────────────── */

.foot { margin-top: clamp(48px, 6vw, 80px); padding-block: 28px 36px; border-top: 1px solid var(--line); font-size: 0.8rem; }
.foot-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px 40px; }
.foot-brand { font: 600 1rem/1.4 var(--head); color: var(--white); letter-spacing: -0.02em; }
.foot-brand span { font: 400 0.8rem var(--mono); color: var(--dim); margin-left: 10px; letter-spacing: -0.01em; }
.foot nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.foot nav a { color: var(--grey); text-decoration: none; }
.foot nav a:hover { color: var(--white); }
.foot-small { margin-top: 22px; font-size: 0.74rem; color: var(--dim); }

/* ── The smaller pages: download, support ──────────────────────────────── */

.page { padding-block: clamp(40px, 7vw, 88px) 0; max-width: 800px; }
.page h1 { margin-top: 22px; font-size: clamp(2.3rem, 5.4vw, 3.9rem); }
.page h2 { margin-top: clamp(40px, 5vw, 60px); padding-top: 24px; border-top: 1px solid var(--line); font-size: clamp(1.4rem, 2.6vw, 1.9rem); letter-spacing: -0.03em; }
.page h2 + * { margin-top: 16px; }
.page p + p, .page p + ul, .page ul + p, .page ol + p, .page p + ol, .page pre + p, .page p + pre { margin-top: 14px; }
.page ol.plain, .page ul.plain { display: grid; gap: 10px; padding-left: 1.6em; list-style: revert; }
.page pre { overflow-x: auto; padding: 14px 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); font: 400 0.82rem/1.6 var(--mono); color: var(--white); }
.page code { color: var(--white); overflow-wrap: anywhere; }
.release { margin-top: 32px; display: grid; gap: 16px; justify-items: start; }
.release.stage { padding: clamp(22px, 4vw, 40px); }
.release h2 { margin: 0; padding: 0; border: 0; }
.release p { color: #d4d4d4; }
.release dl { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 6px 18px; font-size: 0.82rem; }
.release dt { font-size: 0.7rem; line-height: 2; letter-spacing: 0.08em; text-transform: uppercase; color: #c2c2c2; }
.release dd { color: var(--white); overflow-wrap: anywhere; }
.page .faq-list { margin-top: 16px; }
.page-end { margin-top: clamp(48px, 6vw, 80px); }
.page-wide { max-width: 1040px; }
.film { margin-top: 34px; padding: clamp(10px, 2.4vw, 28px); }
.film video { display: block; width: 100%; height: auto; border: 1px solid rgba(255, 255, 255, 0.16); border-radius: clamp(8px, 1.2vw, 14px); background: var(--black); }
.film + .fine { margin-top: 14px; }

.lost { display: grid; justify-items: center; gap: 22px; padding-block: clamp(72px, 14vw, 180px); text-align: center; }
.lost h1 { margin-top: 22px; }

/* ── Narrower screens ──────────────────────────────────────────────────── */

@media (max-width: 980px) {
  .proof, .faq { grid-template-columns: minmax(0, 1fr); }
  .never ul { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .never li { min-height: 0; border-left: 0; border-top: 1px solid var(--line); }
  .never li:nth-child(even) { border-left: 1px solid var(--line); }
  .never li:nth-child(-n + 2) { border-top: 0; }
  .pillars { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .finds ul { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .finds li { border-left: 0; border-top: 1px solid var(--line); }
  .finds li:nth-child(even) { border-left: 1px solid var(--line); }
  .finds li:nth-child(-n + 2) { border-top: 0; }
}
@media (max-width: 720px) {
  .top-nav { display: none; }
  .plans { grid-template-columns: minmax(0, 1fr); }
  .stage { border-radius: 16px; }
  h1 br, .closing h2 br { display: none; }
}
@media (max-width: 560px) {
  .finds ul { grid-template-columns: minmax(0, 1fr); }
  .finds li, .finds li:nth-child(even) { border-left: 0; }
  .finds li:nth-child(2) { border-top: 1px solid var(--line); }
}
@media (max-width: 460px) {
  .top-end > a:not(.pill) { display: none; }
  .receipt .n { padding-left: 10px; }
  .receipt { font-size: 0.78rem; }
}