/* Email List Maker: deep blue and sea green from the app icon, on warm "stationery" paper, with an
   amber postage-stamp accent. Titles and headings use Inter SemiBold, the font of the app's title bar; addresses in monospace, as the app
   writes them. No web fonts or scripts: everything is served from this site (see staticwebapp.config.json). */
/* Inter (SIL Open Font License, fonts/Inter-LICENSE.txt): the font the app uses (Avalonia's WithInterFont),
   served from this site. Only the weight the app's title bar uses, SemiBold, and its italic. */
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("fonts/Inter-SemiBold.woff2") format("woff2");
}
@font-face {
  font-family: "Inter";
  font-style: italic;
  font-weight: 600;
  font-display: swap;
  src: url("fonts/Inter-SemiBoldItalic.woff2") format("woff2");
}

:root {
  --sea: #0e7c66;
  --deep: #0b4f72;
  --stamp: #f2b33d;
  --stamp-deep: #d6941a;
  --stamp-ink: #2b1d04;

  --paper: #fbf8f2;
  --band: #f4eee3;
  --card: #ffffff;
  --border: #e6ddcc;
  --text: #17242d;
  --muted: #5a6670;
  --link: #0b5f7c;
  --mark: #fde7b0;
  --shadow: 0 1px 2px rgb(23 36 45 / 6%), 0 12px 32px rgb(23 36 45 / 10%);

  --display: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0d1519;
    --band: #111d23;
    --card: #15232a;
    --border: #25363f;
    --text: #e6edf0;
    --muted: #9cadb5;
    --link: #7fcbe0;
    --mark: #5a4512;
    --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 12px 32px rgb(0 0 0 / 35%);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font: 17px/1.65 var(--sans);
}

a { color: var(--link); text-underline-offset: 3px; }
h1, h2, h3 { font-family: var(--display); font-weight: 600; letter-spacing: -0.02em; }
code, .mono { font-family: var(--mono); font-size: 0.9em; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 12px; z-index: 10; background: var(--card); padding: 8px 12px; border-radius: 6px; }

/* ---------------------------------------------------------------- header */
.site-header {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-row { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-family: var(--display); font-size: 18px; font-weight: 600; letter-spacing: -0.01em; }
.brand img { border-radius: 8px; }
.site-header nav { display: flex; align-items: center; gap: 22px; }
.site-header nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
.site-header nav a:hover { color: var(--text); }

/* ---------------------------------------------------------------- buttons */
.button {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 22px; border-radius: 999px;
  background: var(--stamp); color: var(--stamp-ink);
  font-weight: 650; text-decoration: none; border: 1px solid var(--stamp-deep);
  box-shadow: 0 2px 0 var(--stamp-deep);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.button:hover { transform: translateY(-1px); box-shadow: 0 3px 0 var(--stamp-deep); }
.button:active { transform: translateY(1px); box-shadow: 0 1px 0 var(--stamp-deep); }
.button.ghost { background: transparent; color: inherit; border-color: currentColor; box-shadow: none; }
.button.ghost:hover { background: rgb(255 255 255 / 10%); }
nav a.button.small { padding: 6px 16px; color: var(--stamp-ink); font-size: 14px; }
@media (prefers-reduced-motion: reduce) { .button { transition: none; } .button:hover, .button:active { transform: none; } }

/* ---------------------------------------------------------------- hero */
.hero {
  position: relative;
  color: #fff;
  background: var(--deep);
  padding: 76px 0 88px;
}
.hero-row { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 56px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; letter-spacing: 0.04em; text-transform: uppercase; opacity: 0.85; margin: 0 0 14px; }
.eyebrow img { border-radius: 6px; }
.hero h1 { font-size: clamp(38px, 5.6vw, 60px); line-height: 1.06; margin: 0 0 18px; }
.hero h1 em { font-style: italic; color: var(--stamp); }
.hero .lead { color: rgb(255 255 255 / 88%); }
.lead { font-size: 20px; color: var(--muted); max-width: 640px; margin: 0 0 28px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.platforms { font-size: 14px; margin: 22px 0 0; opacity: 0.8; }

/* The "letter": messy text in, a clean list out. */
.letter {
  position: relative;
  background: var(--card); color: var(--text);
  border-radius: 14px; box-shadow: 0 24px 60px rgb(4 30 40 / 45%);
  padding: 22px 22px 18px;
  transform: rotate(-1.2deg);
}
.letter::before { /* envelope flap line */
  content: ""; position: absolute; inset: 0; border-radius: 14px; pointer-events: none;
  border: 1px solid var(--border);
}
.stamp {
  position: absolute; top: -18px; right: 18px; width: 64px; height: 76px;
  background: var(--card); padding: 6px; transform: rotate(6deg);
  border: 3px dotted var(--stamp-deep); border-radius: 4px;
  box-shadow: 0 6px 16px rgb(4 30 40 / 25%);
}
.stamp img { width: 100%; height: 100%; object-fit: contain; border-radius: 6px; }
.letter-label { font-size: 12px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 0 0 6px; font-weight: 600; }
.letter-in { font-size: 14px; line-height: 1.55; margin: 0 0 14px; padding-right: 64px; color: var(--muted); overflow-wrap: anywhere; }
.letter-in mark { background: var(--mark); color: var(--text); border-radius: 3px; padding: 0 2px; font-family: var(--mono); font-size: 0.92em; }
.letter-arrow { display: flex; align-items: center; gap: 10px; color: var(--sea); font-size: 13px; font-weight: 600; margin: 0 0 10px; }
.letter-arrow::before, .letter-arrow::after { content: ""; flex: 1; border-top: 2px dashed var(--border); }
.letter-out {
  margin: 0; padding: 12px 14px; border-radius: 8px;
  background: var(--band); border: 1px solid var(--border);
  font: 13.5px/1.6 var(--mono); white-space: pre; overflow-x: auto;
}

/* ---------------------------------------------------------------- sections */
section { padding: 80px 0; }
.band { background: var(--band); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
h2 { font-size: clamp(28px, 3.6vw, 38px); line-height: 1.15; margin: 0 0 10px; }
.kicker { font-family: var(--mono); font-size: 13px; color: var(--sea); letter-spacing: 0.02em; margin: 0 0 8px; }
@media (prefers-color-scheme: dark) { .kicker { color: #4fc3a6; } }
.section-head { max-width: 720px; margin-bottom: 36px; }
.section-head .lead { margin: 0; font-size: 18px; }

/* How it works: numbered steps joined by a dashed line. */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; position: relative; }
.steps::before { content: ""; position: absolute; top: 28px; left: 8%; right: 8%; border-top: 2px dashed var(--border); }
.steps li { position: relative; background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 24px; box-shadow: var(--shadow); }
.step-num {
  display: grid; place-items: center; width: 56px; height: 56px; margin: -52px 0 14px;
  border-radius: 50%; background: var(--stamp); color: var(--stamp-ink); border: 4px solid var(--paper);
  font: 600 22px/1 var(--display);
}
.steps h3 { margin: 0 0 6px; font-size: 21px; }
.steps p { margin: 0; color: var(--muted); }

/* Screenshots: CSS-only tabs (radio buttons), so no script is needed. */
.tour { margin-top: 8px; }
.tour input { position: absolute; opacity: 0; pointer-events: none; }
.tour-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.tour-tabs label {
  cursor: pointer; padding: 8px 16px; border-radius: 999px; font-size: 15px;
  border: 1px solid var(--border); background: var(--card); color: var(--muted);
}
.tour-tabs label:hover { color: var(--text); }
#tab-sources:checked ~ .tour-tabs label[for="tab-sources"],
#tab-output:checked ~ .tour-tabs label[for="tab-output"],
#tab-formatting:checked ~ .tour-tabs label[for="tab-formatting"],
#tab-filter:checked ~ .tour-tabs label[for="tab-filter"] { background: var(--deep); border-color: var(--deep); color: #fff; }
.tour input:focus-visible ~ .tour-tabs label { outline: none; }
#tab-sources:focus-visible ~ .tour-tabs label[for="tab-sources"],
#tab-output:focus-visible ~ .tour-tabs label[for="tab-output"],
#tab-formatting:focus-visible ~ .tour-tabs label[for="tab-formatting"],
#tab-filter:focus-visible ~ .tour-tabs label[for="tab-filter"] { outline: 3px solid var(--stamp); outline-offset: 2px; }
.shot { display: none; margin: 0; }
#tab-sources:checked ~ .tour-frames #shot-sources,
#tab-output:checked ~ .tour-frames #shot-output,
#tab-formatting:checked ~ .tour-frames #shot-formatting,
#tab-filter:checked ~ .tour-frames #shot-filter { display: block; }
.window {
  border-radius: 12px; overflow: hidden; border: 1px solid var(--border); box-shadow: var(--shadow); background: var(--card);
}
.window-bar { display: flex; gap: 6px; padding: 10px 14px; border-bottom: 1px solid var(--border); background: var(--band); }
.window-bar span { width: 11px; height: 11px; border-radius: 50%; background: var(--border); }
.window img { display: block; width: 100%; height: auto; }
.shot figcaption { color: var(--muted); font-size: 15px; margin-top: 12px; }

/* Features: a bento grid. */
.bento { display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px; }
.tile { grid-column: span 2; background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 24px; }
.tile.wide { grid-column: span 3; }
.tile h3 { margin: 10px 0 6px; font-size: 20px; }
.tile p { margin: 0; color: var(--muted); }
.tile .icon { width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; background: color-mix(in srgb, var(--sea) 14%, transparent); color: var(--sea); }
@media (prefers-color-scheme: dark) { .tile .icon { color: #4fc3a6; } }
.tile .icon svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.sample { margin: 14px 0 0; padding: 10px 12px; border-radius: 8px; background: var(--band); border: 1px solid var(--border); font: 13px/1.6 var(--mono); white-space: pre; overflow-x: auto; }

/* File types, as file-extension tags. */
.types { list-style: none; padding: 0; margin: 0 0 18px; display: flex; flex-wrap: wrap; gap: 10px; }
.types li { font-family: var(--mono); font-size: 14px; padding: 6px 12px; border-radius: 6px; background: var(--card); border: 1px solid var(--border); border-left: 4px solid var(--sea); }
.note { color: var(--muted); }

/* Privacy: a deep-blue band. */
.privacy-band { background: var(--deep); color: #e8f2f5; position: relative; }
.privacy-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 48px; align-items: start; }
.privacy-band h2 { color: #fff; }
.privacy-band .lead { color: rgb(232 242 245 / 85%); }
.privacy-band a { color: var(--stamp); }
.checks { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.checks li { display: grid; grid-template-columns: 28px 1fr; gap: 10px; }
.checks li::before {
  content: "✓"; display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%;
  background: var(--stamp); color: var(--stamp-ink); font-weight: 700; font-size: 14px;
}

/* Downloads. */
.downloads { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.download { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 26px; display: flex; flex-direction: column; gap: 10px; }
.download h3 { margin: 0; font-size: 22px; }
.download p { margin: 0; color: var(--muted); flex: 1; }
.download .button { align-self: flex-start; margin-top: 8px; }
.download code { background: var(--band); padding: 2px 6px; border-radius: 4px; }

/* ---------------------------------------------------------------- footer */
.site-footer { border-top: 1px solid var(--border); padding: 44px 0 52px; color: var(--muted); font-size: 15px; }
.footer-row { display: grid; gap: 24px; }
.site-footer p { margin: 10px 0 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--text); text-decoration: underline; }
@media (min-width: 760px) {
  .footer-row { grid-template-columns: minmax(260px, 1fr) minmax(0, 560px); align-items: start; }
  .footer-links { justify-content: flex-end; }
}

/* ---------------------------------------------------------------- inner pages (privacy, support, 404) */
.page-hero { padding: 56px 0 40px; }
.page-hero h1 { font-size: clamp(34px, 4.6vw, 48px); line-height: 1.1; margin: 0 0 8px; }
.page-hero.hero { padding: 64px 0 72px; }
.prose > * { max-width: 760px; }
.prose h2 { font-size: 26px; margin: 36px 0 8px; }
.prose h3 { font-size: 20px; margin: 26px 0 6px; }
.prose li { margin: 6px 0; }
.prose p, .prose li { color: var(--text); }
.prose .updated { color: var(--muted); margin: 0; }
.prose code { background: var(--band); padding: 1px 5px; border-radius: 4px; }
.callout { border: 1px solid var(--border); border-left: 4px solid var(--stamp); background: var(--card); border-radius: 8px; padding: 14px 18px; margin: 20px 0; }
.faq details { border: 1px solid var(--border); border-radius: 10px; background: var(--card); padding: 14px 18px; margin: 10px 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { margin: 10px 0 0; color: var(--muted); }

/* ---------------------------------------------------------------- narrow screens */
@media (max-width: 900px) {
  .hero-row, .privacy-row { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .letter { transform: none; }
  .steps { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .steps::before { display: none; }
  .bento { grid-template-columns: minmax(0, 1fr); }
  .tile, .tile.wide { grid-column: auto; }
  .downloads { grid-template-columns: minmax(0, 1fr); }
  .site-header nav a:not(.button) { display: none; }
  .letter-in { padding-right: 0; padding-top: 34px; }
  .stamp { top: -22px; }
  section { padding: 60px 0; }
}
body { overflow-x: hidden; }

/* Small additions. */
.letter-in .fake-link { color: var(--link); text-decoration: underline; text-underline-offset: 3px; }
.privacy-band .kicker { color: var(--stamp); }