:root {
  --bg: #f6f7fb; --surface: #ffffff; --text: #171b2b; --muted: #5f6680; --border: #e2e5ef;
  --accent: #4f6bed; --accent-2: #3a4fd0; --accent-soft: #eef1fe; --on-accent: #ffffff;
  --beta: #f0a020; --on-beta: #241700; --ok: #1f9d5c; --danger: #d23b3b;
  --shadow: 0 20px 50px -20px rgba(30, 40, 90, .35);
  --radius: 16px; --max: 1120px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1118; --surface: #181b25; --text: #e9ebf3; --muted: #9aa0b6; --border: #2a2e3c;
    --accent: #7088ff; --accent-2: #8ea0ff; --accent-soft: #1d2340; --on-accent: #0b0e1d;
    --ok: #4fd08a; --danger: #ff6b6b; --shadow: 0 20px 50px -20px rgba(0, 0, 0, .7);
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); }
h1, h2, h3 { line-height: 1.15; letter-spacing: -.015em; margin: 0 0 .6rem; }
h1 { font-size: clamp(2.1rem, 5.2vw, 3.5rem); letter-spacing: -.03em; }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.3rem); letter-spacing: -.02em; }
h3 { font-size: 1.1rem; }
p { margin: 0 0 1rem; }
.muted { color: var(--muted); }
main > section { max-width: var(--max); margin: 0 auto; padding: 72px 20px; }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .76rem; font-weight: 700; color: var(--accent); margin-bottom: .7rem; }
.section-head { max-width: 680px; margin-bottom: 2.5rem; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  padding: .85rem 1.35rem; border-radius: 12px; font: inherit; font-weight: 650; text-decoration: none;
  border: 1px solid transparent; cursor: pointer; transition: transform .12s, filter .12s, background .12s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { filter: brightness(1.07); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--surface); }
.btn-sm { padding: .5rem .95rem; font-size: .92rem; border-radius: 10px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: .6; cursor: default; }

.badge { background: var(--beta); color: var(--on-beta); font-size: .62rem; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; padding: .14rem .45rem; border-radius: 99px; }

/* nav */
.nav {
  position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: .8rem max(20px, calc((100vw - var(--max)) / 2 + 20px));
  background: color-mix(in srgb, var(--bg) 82%, transparent); backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px); border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
}
.brand { display: flex; align-items: center; gap: .5rem; font-weight: 750; font-size: 1.1rem; color: var(--text); text-decoration: none; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.brand.small { font-size: 1rem; }
.brand.small img { width: 24px; height: 24px; border-radius: 6px; }
.nav nav { display: flex; align-items: center; gap: 1.4rem; }
.nav nav a:not(.btn) { color: var(--muted); text-decoration: none; font-size: .95rem; }
.nav nav a:not(.btn):hover { color: var(--text); }

/* hero */
.hero { display: grid; grid-template-columns: 1.05fr .95fr; gap: 3rem; align-items: center; padding-top: 56px !important; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 34rem; }
.lead strong { color: var(--text); }
.cta-row { display: flex; flex-wrap: wrap; gap: .75rem; margin: 1.6rem 0 1.4rem; }
.ticks { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: .5rem 1.3rem; color: var(--muted); font-size: .93rem; }
.ticks li::before { content: "✓"; color: var(--ok); font-weight: 800; margin-right: .4rem; }

.hero-art { position: relative; height: 560px; }
.hero-art::before {
  content: ""; position: absolute; inset: 8% 0 4% 6%; border-radius: 40% 60% 55% 45% / 50% 45% 55% 50%;
  background: radial-gradient(circle at 30% 30%, color-mix(in srgb, var(--accent) 45%, transparent), transparent 65%),
              radial-gradient(circle at 75% 70%, color-mix(in srgb, var(--beta) 35%, transparent), transparent 60%);
  filter: blur(30px); opacity: .75;
}
.phone {
  margin: 0; background: #0d0f16; padding: 9px; border-radius: 38px; box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, .08); aspect-ratio: 390 / 664; overflow: hidden;
}
.phone img { width: 100%; height: 100%; object-fit: cover; object-position: top; border-radius: 30px; }
.hero-art .phone { position: absolute; width: 270px; }
.phone-front { right: 8%; top: 40px; transform: rotate(3deg); z-index: 2; }
.phone-back { left: 4%; top: 0; transform: rotate(-6deg); opacity: .92; }

/* features */
.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.2rem; padding-top: 24px !important; }
.feature { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.4rem; }
.feature p { color: var(--muted); font-size: .95rem; margin: 0; }
.icon { width: 44px; height: 44px; border-radius: 12px; background: var(--accent-soft); display: grid; place-items: center; margin-bottom: 1rem; }
.icon svg { width: 24px; height: 24px; fill: none; stroke: var(--accent); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* how */
.steps { list-style: none; padding: 0; margin: 0 0 3rem; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; }
.steps li { position: relative; padding: 1.4rem 1.4rem 1.2rem; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--border); }
.steps p { color: var(--muted); margin: 0; font-size: .95rem; }
.num { display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: var(--accent); color: var(--on-accent); font-weight: 800; margin-bottom: .8rem; }
.shots { display: flex; justify-content: center; gap: 2rem; }
.shots .phone { width: 250px; }
.shots .phone:nth-child(2) { transform: translateY(-24px); }

/* security */
.security { }
.sec-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.2rem; }
.sec-item { padding: 1.4rem; border-radius: var(--radius); border: 1px solid var(--border); background: linear-gradient(160deg, var(--surface), color-mix(in srgb, var(--surface) 70%, var(--accent-soft))); }
.sec-item p { color: var(--muted); margin: 0; }

/* join */
.join-card {
  display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; padding: 2.5rem; border-radius: 24px;
  background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow);
}
.join-intro p { color: var(--muted); }
.join-intro .ticks { flex-direction: column; gap: .45rem; }
.signup label { display: block; font-weight: 600; font-size: .93rem; margin-bottom: 1rem; }
.signup input[type=email], .signup input[type=text] {
  display: block; width: 100%; margin-top: .4rem; padding: .8rem .9rem; font: inherit; font-size: 16px; font-weight: 400;
  color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 10px;
}
.signup input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.signup input[aria-invalid=true] { border-color: var(--danger); }
.field-hint { display: block; font-weight: 400; color: var(--muted); font-size: .84rem; margin-top: .3rem; }
.optional { font-weight: 400; color: var(--muted); }
fieldset { border: 0; padding: 0; margin: 0 0 1rem; }
legend { font-weight: 600; font-size: .93rem; margin-bottom: .5rem; padding: 0; }
.chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.chip { margin: 0 !important; font-weight: 500 !important; }
.chip input { position: absolute; opacity: 0; pointer-events: none; }
.chip span { display: inline-block; padding: .45rem .85rem; border-radius: 99px; border: 1px solid var(--border); background: var(--bg); cursor: pointer; font-size: .9rem; user-select: none; }
.chip input:checked + span { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.chip input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }
.signup .check { display: flex; gap: .55rem; align-items: center; font-weight: 500; }
.signup .check input { width: 18px; height: 18px; accent-color: var(--accent); margin: 0; }
.trap { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.form-error { color: var(--danger); min-height: 1.3em; font-size: .9rem; margin: 0 0 .6rem; }
.fine { color: var(--muted); font-size: .8rem; margin: .8rem 0 0; }
.signup-done { text-align: center; align-self: center; }
.done-icon { width: 60px; height: 60px; border-radius: 50%; background: color-mix(in srgb, var(--ok) 18%, transparent); color: var(--ok); font-size: 1.8rem; font-weight: 800; display: grid; place-items: center; margin: 0 auto 1rem; }
.signup-done p { color: var(--muted); }

/* faq */
.faq { max-width: 820px !important; }
.faq details { border-bottom: 1px solid var(--border); padding: 1.1rem 0; }
.faq summary { cursor: pointer; font-weight: 650; font-size: 1.05rem; list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--accent); font-size: 1.4rem; line-height: 1; transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { color: var(--muted); margin: .8rem 0 0; }

/* footer */
.footer {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem;
  max-width: var(--max); margin: 0 auto; padding: 2rem 20px calc(2rem + env(safe-area-inset-bottom)); border-top: 1px solid var(--border);
}
.footer nav { display: flex; gap: 1.4rem; }
.footer nav a { color: var(--muted); text-decoration: none; font-size: .93rem; }
.footer nav a:hover { color: var(--text); }

/* responsive */
@media (max-width: 960px) {
  .features { grid-template-columns: repeat(2, 1fr); }
  .hero { grid-template-columns: 1fr; gap: 1rem; }
  .hero-art { height: 470px; max-width: 520px; width: 100%; margin: 0 auto; }
  .hero-art .phone { width: 230px; }
  .join-card { grid-template-columns: 1fr; gap: 1.5rem; padding: 1.8rem; }
}
@media (max-width: 680px) {
  main > section { padding: 52px 16px; }
  .nav { padding: .7rem 16px; }
  .hide-sm { display: none; }
  .features, .steps, .sec-grid { grid-template-columns: 1fr; }
  .hero-art { height: 400px; }
  .hero-art .phone { width: 190px; border-radius: 30px; padding: 7px; }
  .hero-art .phone img { border-radius: 24px; }
  .phone-front { right: 2%; }
  .phone-back { left: 0; }
  .shots { gap: .8rem; overflow: hidden; }
  .shots .phone { width: 31%; border-radius: 18px; padding: 4px; }
  .shots .phone img { border-radius: 14px; }
  .shots .phone:nth-child(2) { transform: translateY(-12px); }
  .join-card { padding: 1.4rem; border-radius: 18px; }
  .cta-row .btn { flex: 1 1 100%; }
  .footer { padding-left: 16px; padding-right: 16px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }

.signup-external { align-self: center; text-align: center; }
.ext-icon { width: 60px; height: 60px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font-size: 1.7rem; display: grid; place-items: center; margin: 0 auto 1rem; }
.signup-external p { color: var(--muted); }

/* ---- legal pages ---- */
.doc { max-width: 760px; margin: 0 auto; padding: 56px 20px 72px; }
.doc h1 { font-size: clamp(2rem, 4.5vw, 2.8rem); margin-bottom: .3rem; }
.doc h2 { font-size: 1.3rem; margin: 2.2rem 0 .7rem; letter-spacing: -.01em; }
.doc p, .doc li { color: var(--muted); }
.doc strong, .doc em { color: var(--text); }
.doc ul { padding-left: 1.2rem; margin: 0 0 1rem; }
.doc li { margin: .35rem 0; }
.doc code { font-size: .9em; background: var(--accent-soft); color: var(--text); padding: .1rem .35rem; border-radius: 5px; }
.doc .updated { font-size: .9rem; margin-bottom: 1.8rem; }
.doc .summary { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.3rem 1.5rem; margin-bottom: 2rem; }
.doc .summary h2 { margin-top: 0; font-size: 1.05rem; }
.doc .summary ul { margin: 0; }
@media (max-width: 680px) { .doc { padding: 40px 16px 56px; } }

.footer-left { display: flex; flex-direction: column; gap: .35rem; }
.ptech { color: var(--muted); font-size: .85rem; text-decoration: none; }
.ptech strong { color: var(--text); }
.ptech:hover strong { color: var(--accent); }
.footer nav { flex-wrap: wrap; row-gap: .6rem; }
@media (max-width: 680px) { .footer nav { gap: .6rem 1.1rem; } .footer nav a { white-space: nowrap; } }