/* unseenkey.com — light by default, dark by system preference or the toggle. */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --glass: rgba(246, 248, 250, 0.72);
  --text: #1f2328;
  --muted: #59636e;
  --line: #d0d7de;
  --accent: #0969da;
  --accent-soft: #ddf4ff;
  --ok: #1a7f37;
  --ok-soft: #dafbe1;
  --warn: #9a6700;
  --warn-soft: #fff8c5;
  --bad: #cf222e;
  --bad-soft: #ffebe9;
  --code-bg: #f6f8fa;
  --shadow: 0 1px 2px rgba(31, 35, 40, 0.06), 0 12px 32px rgba(31, 35, 40, 0.08);
  --glow: rgba(9, 105, 218, 0.14);
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #0d1117;
  --bg-soft: #161b22;
  --glass: rgba(22, 27, 34, 0.66);
  --text: #e6edf3;
  --muted: #9198a1;
  --line: #30363d;
  --accent: #58a6ff;
  --accent-soft: #121d2f;
  --ok: #3fb950;
  --ok-soft: #12261e;
  --warn: #d29922;
  --warn-soft: #2a2208;
  --bad: #ff7b72;
  --bad-soft: #3a1d1d;
  --code-bg: #161b22;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px rgba(0, 0, 0, 0.45);
  --glow: rgba(88, 166, 255, 0.16);
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1117;
    --bg-soft: #161b22;
    --glass: rgba(22, 27, 34, 0.66);
    --text: #e6edf3;
    --muted: #9198a1;
    --line: #30363d;
    --accent: #58a6ff;
    --accent-soft: #121d2f;
    --ok: #3fb950;
    --ok-soft: #12261e;
    --warn: #d29922;
    --warn-soft: #2a2208;
    --bad: #ff7b72;
    --bad-soft: #3a1d1d;
    --code-bg: #161b22;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 32px rgba(0, 0, 0, 0.45);
    --glow: rgba(88, 166, 255, 0.16);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre, kbd, .f-mono, .term-body {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}
code { font-size: 0.92em; background: var(--code-bg); border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; }
pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 20px;
  overflow-x: auto;
  line-height: 1.55;
  margin: 0;
  font-size: 15px;
}
pre .c { color: var(--muted); }
pre .h, .h { color: var(--accent); }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.glass {
  background: var(--glass);
  border: 1px solid var(--line);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  box-shadow: var(--shadow);
}
.grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 50;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}
:root[data-theme="dark"] .grain { mix-blend-mode: screen; opacity: 0.05; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .grain { mix-blend-mode: screen; opacity: 0.05; } }

/* header */
.top { display: flex; align-items: center; gap: 18px; padding: 18px 20px; position: relative; z-index: 2; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 650; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.top nav { display: flex; gap: 20px; font-size: 15px; margin-left: auto; }
.top nav a { color: var(--muted); }
.top nav a:hover { color: var(--text); text-decoration: none; }
.theme {
  width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--bg-soft); color: var(--muted); display: grid; place-items: center; cursor: pointer;
}
.theme:hover { color: var(--text); }
.theme .i-moon { display: none; }
:root[data-theme="dark"] .theme .i-sun { display: none; }
:root[data-theme="dark"] .theme .i-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme .i-sun { display: none; }
  :root:not([data-theme="light"]) .theme .i-moon { display: block; }
}
@media (max-width: 760px) { .top nav { display: none; } .theme { margin-left: auto; } }

/* hero */
.hero {
  position: relative;
  padding: 36px 0 24px;
  overflow: hidden;
  --mx: 50%;
  --my: 30%;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10%;
  background:
    radial-gradient(600px 420px at var(--mx) var(--my), var(--glow), transparent 70%),
    radial-gradient(900px 500px at 80% 10%, var(--accent-soft), transparent 70%);
  pointer-events: none;
  transition: background-position 0.3s;
}
.hero-grid { position: relative; display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 36px; align-items: center; }
@media (max-width: 899px) { .hero-grid { grid-template-columns: 1fr; } .hero-art { order: -1; } }
.hero h1 { font-size: clamp(32px, 4.6vw, 52px); line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 18px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p.lead { font-size: 19px; color: var(--muted); margin: 0 0 14px; }
.hero p.lead.strong { color: var(--text); font-weight: 500; }
.hero .cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
.badge {
  display: inline-block; font-size: 13px; padding: 4px 11px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--muted); margin-bottom: 18px; background: var(--glass);
}
.hero-art { position: relative; min-height: 440px; display: grid; place-items: center; }
#hero-canvas { width: 100%; height: 460px; display: none; }
#hero-canvas.on { display: block; }
#hero-still { width: 100%; max-width: 640px; height: auto; display: block; }
#hero-still.off { display: none; }
.hero-caption { position: absolute; bottom: 2px; left: 0; right: 0; text-align: center; font-size: 13px; color: var(--muted); }
.btn {
  display: inline-block; padding: 11px 20px; border-radius: 10px; font-weight: 600; font-size: 16px;
  border: 1px solid var(--line); background: var(--bg-soft); color: var(--text); cursor: pointer;
  transition: transform 0.15s, border-color 0.15s, filter 0.15s;
}
.btn:hover { text-decoration: none; border-color: var(--muted); transform: translateY(-1px); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.small { padding: 7px 13px; font-size: 14px; font-weight: 500; }
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 34px; position: relative;
}
.stats > div { padding: 14px 16px; border-radius: 12px; border: 1px solid var(--line); background: var(--glass); }
.stats b { display: block; font-size: 26px; letter-spacing: -0.02em; }
.stats span:last-child { color: var(--muted); font-size: 14px; }
@media (max-width: 760px) { .stats { grid-template-columns: repeat(2, 1fr); } }

/* sections */
section { padding: 56px 0; border-top: 1px solid var(--line); }
section h2 { font-size: 30px; letter-spacing: -0.015em; margin: 0 0 8px; }
section p.sub { color: var(--muted); margin: 0 0 24px; max-width: 760px; font-size: 18px; }
.fine { color: var(--muted); font-size: 15px; margin-top: 16px; }
.cols-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center; }
.cols-2.top-align { align-items: start; }
.cols-2 > *, .card, .panel { min-width: 0; }
@media (max-width: 860px) { .cols-2 { grid-template-columns: 1fr; } }
.h-row { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.h-row p.sub { margin-bottom: 8px; }

/* reveals */
[data-reveal] { opacity: 0; transform: translateY(14px); transition: opacity 0.6s ease, transform 0.6s ease; }
[data-reveal].in { opacity: 1; transform: none; }
[data-reveal="stagger"] > * { opacity: 0; }
[data-reveal="stagger"].in > * { opacity: 1; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal], [data-reveal="stagger"] > * { opacity: 1 !important; transform: none !important; transition: none; }
  .btn { transition: none; }
}

/* terminal */
.term { border-radius: 14px; overflow: hidden; }
.term-bar { display: flex; align-items: center; gap: 7px; padding: 10px 14px; border-bottom: 1px solid var(--line); }
.term-bar span { width: 11px; height: 11px; border-radius: 50%; background: var(--line); }
.term-bar span:nth-child(1) { background: #ff5f57; } .term-bar span:nth-child(2) { background: #febc2e; } .term-bar span:nth-child(3) { background: #28c840; }
.term-bar em { margin-left: auto; font-style: normal; font-size: 12px; color: var(--muted); }
.term-body { padding: 16px 18px; min-height: 290px; font-size: 14px; line-height: 1.6; white-space: pre-wrap; word-break: break-word; }
.t-cmd { color: var(--text); margin-top: 8px; }
.t-cmd:first-child { margin-top: 0; }
.t-ps { color: var(--accent); }
.t-out { color: var(--muted); }
.t-cur { display: inline-block; width: 8px; height: 15px; background: var(--accent); vertical-align: -2px; margin-left: 2px; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* flow diagram */
.flow-wrap { border-radius: 16px; padding: 10px 14px 4px; }
#flow { display: block; width: 100%; height: auto; font: 15px -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif; }
#flow .f-box { fill: var(--bg-soft); stroke: var(--line); stroke-width: 1.5; }
#flow .f-box-accent { stroke: var(--accent); stroke-width: 2; }
#flow .f-title { font-weight: 600; font-size: 17px; fill: var(--text); }
#flow .f-muted { fill: var(--muted); }
#flow .f-small { font-size: 13px; }
#flow .f-mono { font-size: 14px; }
#flow .f-accent { fill: var(--accent); }
#flow .f-bad { fill: var(--bad); font-size: 14px; }
#flow .f-chip { fill: var(--accent-soft); stroke: var(--accent); }
#flow .f-chip-bad { fill: var(--bad-soft); stroke: var(--bad); }
#flow .f-arrow { stroke: var(--accent); stroke-width: 2; }
#flow .f-arrow-back { stroke: var(--muted); }
#flow .f-arrow-head { fill: var(--accent); }
#flow .f-step rect { fill: transparent; transition: fill 0.3s; }
#flow .f-step text { fill: var(--text); transition: fill 0.3s; }
#flow .f-step.lit rect { fill: var(--accent-soft); }
#flow .f-step.lit text { fill: var(--accent); font-weight: 600; }
#flow .f-step.bad rect { fill: var(--bad-soft); }
#flow .f-step.bad text { fill: var(--bad); font-weight: 600; }
#flow #f-provider rect { transition: stroke 0.3s, stroke-width 0.3s; }
#flow #f-provider.lit rect { stroke: var(--ok); stroke-width: 2.5; }
#flow .f-pkt { stroke-width: 1.5; }
#flow .f-pkt.ok { fill: var(--accent-soft); stroke: var(--accent); }
#flow .f-pkt.key { fill: var(--warn-soft); stroke: var(--warn); }
#flow .f-pkt.resp { fill: var(--bg-soft); stroke: var(--muted); }
#flow .f-pkt.bad { fill: var(--bad-soft); stroke: var(--bad); }
#flow .f-pkt-text { font-size: 13px; font-weight: 600; fill: var(--text); }

/* cards */
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.card { border-radius: 14px; padding: 20px 22px; transition: transform 0.2s, border-color 0.2s; }
.card:hover { transform: translateY(-2px); border-color: var(--muted); }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.three { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.three .card { padding: 26px; }
.three .card h3 { font-size: 20px; }
.tag { display: inline-block; font-size: 12px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: var(--ok); background: var(--ok-soft); border-radius: 6px; padding: 2px 8px; margin-bottom: 10px; }
.tag.soon { color: var(--warn); background: var(--warn-soft); }

/* try it */
.panel { border-radius: 16px; padding: 26px; }
.panel h2 { font-size: 24px; }
.panel p.sub { font-size: 16px; margin-bottom: 16px; }
.samples { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
#demo-input, .ex-controls select, .waitlist input, .waitlist select, .waitlist textarea {
  font: inherit; font-size: 15px; color: var(--text); background: var(--bg);
  border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; width: 100%;
}
#demo-input { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; resize: vertical; }
.demo-out { margin-top: 12px; padding: 12px 14px; border-radius: 10px; font-size: 15px; min-height: 48px; border: 1px solid var(--line); color: var(--muted); }
.demo-out[data-kind="idle"] { opacity: 0.7; }
.demo-out[data-kind="idle"]::before { content: "The verdict appears here."; }
.demo-out[data-kind="key"] { background: var(--bad-soft); border-color: var(--bad); color: var(--text); }
.demo-out[data-kind="key"]::before { content: "Would leak. "; font-weight: 700; color: var(--bad); }
.demo-out[data-kind="handle"] { background: var(--ok-soft); border-color: var(--ok); color: var(--text); }
.demo-out[data-kind="handle"]::before { content: "Harmless. "; font-weight: 700; color: var(--ok); }
.ex-controls { display: grid; gap: 10px; grid-template-columns: 1fr 1.4fr; margin-bottom: 14px; }
@media (max-width: 560px) { .ex-controls { grid-template-columns: 1fr; } }
.ex-controls label { font-size: 13px; color: var(--muted); display: grid; gap: 5px; }
.ex-lines { margin: 0 0 12px; padding-left: 20px; font-size: 15px; }
.ex-lines li { margin-bottom: 6px; }
.ex-rules { display: none; margin-top: 12px; }
.ex-rules.open { display: block; }
.ex-rule-group { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-bottom: 8px; }
.ex-rule-group code { font-size: 12.5px; }
.ex-k { font-size: 11px; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; color: var(--muted); min-width: 48px; }
.ex-k.ok { color: var(--ok); } .ex-k.bad { color: var(--bad); }

/* install, security */
ul.plain { padding-left: 20px; margin: 0; }
ul.plain li { margin-bottom: 8px; }

/* waitlist */
.waitlist { border-radius: 16px; padding: 32px; }
.waitlist form { display: grid; gap: 12px; grid-template-columns: 1fr; max-width: 540px; }
.waitlist label { font-size: 14px; color: var(--muted); display: grid; gap: 6px; }
.waitlist textarea { min-height: 72px; resize: vertical; }
.waitlist .hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.waitlist .msg { font-size: 15px; margin-top: 4px; }
.waitlist .msg.ok { color: var(--ok); }
.waitlist .msg.err { color: var(--warn); }

footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
footer a { color: var(--muted); }

.link { background: none; border: 0; padding: 0; font: inherit; color: var(--accent); cursor: pointer; }
.link:hover { text-decoration: underline; }