/* Halyard Mail beta portal.
   Layout follows the shape thunderbird.net uses: a dark full-width nav, a
   large centred hero with one accented word, then a product shot. That
   structure is common to most modern software landing pages; none of
   Thunderbird's actual assets, colours or copy are used here. */

:root {
  --bg: #ffffff;
  --bg-alt: #f5f6f7;
  --panel: #ffffff;
  --ink: #15181c;
  --ink-soft: #3d4650;
  --muted: #6a747f;
  --line: #e2e5e9;
  --accent: #1d4e6f;
  --accent-bright: #2f7fb5;
  --accent-ink: #ffffff;
  --nav-bg: #14202b;
  --nav-ink: #f2f4f6;
  --warn-bg: #fdf6e7;
  --warn-line: #d9a441;
  --good-bg: #edf5ef;
  --good-line: #4a8a55;
  --code-bg: #f2f4f6;
  --shadow: 0 18px 50px rgba(18, 30, 42, .13);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171a;
    --bg-alt: #1a1e22;
    --panel: #1c2126;
    --ink: #e9ebed;
    --ink-soft: #c2c8cd;
    --muted: #939ba3;
    --line: #2e353b;
    --accent: #5fa8d3;
    --accent-bright: #7cc0e6;
    --accent-ink: #0d1114;
    --nav-bg: #0e1519;
    --nav-ink: #eef1f3;
    --warn-bg: #2a2417;
    --warn-line: #a97f2e;
    --good-bg: #16241a;
    --good-line: #4a8a55;
    --code-bg: #101417;
    --shadow: 0 18px 50px rgba(0, 0, 0, .45);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ---------- navigation ---------- */

.nav {
  background: var(--nav-bg);
  color: var(--nav-ink);
  position: sticky;
  top: 0;
  z-index: 20;
}
.nav .inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: .9rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.brand {
  display: flex; align-items: center; gap: .6rem;
  color: var(--nav-ink); text-decoration: none;
  font-size: 1.25rem; font-weight: 700; letter-spacing: .01em;
  margin-right: auto;
}
.brand .mark {
  width: 30px; height: 30px; border-radius: 7px;
  background: linear-gradient(145deg, var(--accent-bright), var(--accent));
  display: grid; place-items: center;
  font-size: 1rem; color: #fff;
}
.nav a.link {
  color: var(--nav-ink); text-decoration: none;
  font-size: .95rem; opacity: .85; padding: .4rem 0;
  border-bottom: 2px solid transparent;
}
.nav a.link:hover { opacity: 1; border-bottom-color: var(--accent-bright); }
.nav .cta {
  border: 1.5px solid rgba(255,255,255,.55);
  border-radius: 5px; padding: .5rem 1.2rem;
  color: var(--nav-ink); text-decoration: none;
  font-size: .95rem; font-weight: 600;
}
.nav .cta:hover { background: rgba(255,255,255,.12); border-color: #fff; }

@media (max-width: 760px) {
  .nav .inner { flex-wrap: wrap; gap: .9rem 1.1rem; padding: .8rem 1rem; }
  .brand { margin-right: 0; width: 100%; }
}

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

.hero {
  text-align: center;
  padding: 4.5rem 1.5rem 1rem;
  max-width: 900px;
  margin: 0 auto;
}
.hero h1 {
  margin: 0;
  font-size: clamp(2.4rem, 6vw, 4rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  font-weight: 700;
}
.hero h1 .accent {
  background: linear-gradient(100deg, var(--accent-bright), var(--accent));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: var(--accent-bright);
}
.hero .tagline {
  margin: 1.1rem 0 0;
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
  color: var(--ink-soft);
}
.hero p.lede {
  margin: 1.4rem auto 0;
  max-width: 660px;
  color: var(--muted);
  font-size: 1.02rem;
}
.hero .actions { margin-top: 2rem; display: flex; gap: .8rem; justify-content: center; flex-wrap: wrap; }

.shot {
  max-width: 1000px;
  margin: 3rem auto 0;
  padding: 0 1.5rem;
}
.shot img {
  width: 100%; height: auto; display: block;
  border-radius: 10px; border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

/* ---------- generic page ---------- */

main { max-width: 860px; margin: 0 auto; padding: 2.5rem 1.5rem 4rem; }
main.wide { max-width: 1140px; }

h2 { margin: 2.4rem 0 .8rem; font-size: 1.45rem; letter-spacing: -.01em; }
h2:first-child { margin-top: 0; }
h3 { margin: 1.6rem 0 .5rem; font-size: 1.06rem; }

.band { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 3rem 1.5rem; margin-top: 4rem; }
.band .inner { max-width: 1080px; margin: 0 auto; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 9px; padding: 1.4rem 1.5rem; }
.card h3 { margin-top: 0; }
.card p { margin-bottom: 0; color: var(--muted); font-size: .95rem; }

.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 9px; padding: 1.4rem 1.6rem; margin: 1.3rem 0; }

.warn { background: var(--warn-bg); border-left: 4px solid var(--warn-line); padding: 1rem 1.2rem; border-radius: 5px; }
.good { background: var(--good-bg); border-left: 4px solid var(--good-line); padding: 1rem 1.2rem; border-radius: 5px; }
.error { background: var(--warn-bg); border-left: 4px solid #b4453a; padding: .9rem 1.1rem; border-radius: 5px; margin-bottom: 1.2rem; }

code, .keybox {
  font-family: "Cascadia Mono", Consolas, "SF Mono", Menlo, monospace;
  background: var(--code-bg); border: 1px solid var(--line); border-radius: 4px;
}
code { padding: .12rem .4rem; font-size: .89em; }
.keybox { display: block; padding: 1rem 1.1rem; font-size: .92rem; line-height: 1.75; word-break: break-all; user-select: all; }

label { display: block; margin: 1.1rem 0 .35rem; font-weight: 600; font-size: .93rem; }
input[type=text], input[type=email] {
  width: 100%; padding: .68rem .8rem; font-size: 1rem;
  background: var(--bg); color: var(--ink);
  border: 1px solid var(--line); border-radius: 5px;
}
input:focus { outline: 2px solid var(--accent-bright); outline-offset: 1px; border-color: transparent; }

.button, button {
  display: inline-block; padding: .78rem 1.6rem;
  font-size: 1rem; font-weight: 600; font-family: inherit;
  background: var(--accent); color: var(--accent-ink);
  border: none; border-radius: 5px; cursor: pointer; text-decoration: none;
}
.button:hover, button:hover { background: var(--accent-bright); }
.button.ghost { background: transparent; color: var(--accent); border: 1.5px solid var(--line); }
.button.ghost:hover { background: var(--bg-alt); color: var(--accent); }

table { border-collapse: collapse; width: 100%; margin: 1.1rem 0; font-size: .94rem; }
th, td { text-align: left; padding: .58rem .7rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 600; color: var(--muted); white-space: nowrap; }

ol, ul { padding-left: 1.35rem; }
li { margin: .45rem 0; }

.meta { color: var(--muted); font-size: .91rem; }

footer { border-top: 1px solid var(--line); padding: 2rem 1.5rem; background: var(--bg-alt); }
footer .inner { max-width: 1080px; margin: 0 auto; color: var(--muted); font-size: .88rem; }