/* Sainsei marketing site — one stylesheet, no framework, no web fonts, no JS. */

:root {
  /* Brand: navy #0E4872 (primary, headings, buttons) + green #69BB26 (accents).
     #69BB26 on white is only 2.4:1, so it is used for fills/large shapes; small green text uses --green-text (5:1). */
  --navy: #0E4872;
  --navy-900: #0a3555;
  --navy-100: #e3edf5;
  --green: #69BB26;
  --green-text: #3b7713;
  --green-100: #eaf5df;
  --bg: #f6f8fb;
  --bg-alt: #eaf0f6;
  --surface: #ffffff;
  --ink: #10263a;
  --ink-soft: #4b5d6e;
  --line: #d9e2eb;
  --heading: var(--navy);
  --accent: var(--navy);          /* links, primary buttons, outlines */
  --accent-ink: #ffffff;
  --highlight: var(--green-text); /* eyebrows, step times, small accent text */
  --mark: var(--green);           /* decorative fills, rules, borders */
  --tint-a: var(--green-100);
  --tint-b: var(--navy-100);
  --line-b: #8fb0cc;
  --focus: var(--green-text);
  --radius: 14px;
  --radius-lg: 22px;
  --shadow: 0 1px 2px rgb(14 72 114 / 6%), 0 8px 24px rgb(14 72 114 / 9%);
  --wrap: 1120px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1722;
    --bg-alt: #0f1e2c;
    --surface: #132536;
    --ink: #e8eef4;
    --ink-soft: #a9b9c8;
    --line: #22384c;
    --heading: #f1f5f9;
    --accent: var(--green);         /* 7.5:1 on --bg */
    --accent-ink: #0b1722;
    --highlight: #8fd14f;
    --tint-a: #1c3a1a;
    --tint-b: #173450;
    --line-b: #3d6d97;
    --focus: #8fd14f;
    --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 8px 24px rgb(0 0 0 / 30%);
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 5rem; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; height: auto; display: block; }

a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 6px; }

h1, h2, h3 { color: var(--heading); line-height: 1.15; margin: 0 0 0.6em; letter-spacing: -0.01em; }
h1 { font-family: var(--font-serif); font-size: clamp(2.2rem, 5.2vw, 3.6rem); font-weight: 600; }
h2 { font-family: var(--font-serif); font-size: clamp(1.7rem, 3.4vw, 2.4rem); font-weight: 600; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }

.wrap { width: min(100% - 2.5rem, var(--wrap)); margin-inline: auto; }

.skip-link {
  position: absolute; left: 1rem; top: -4rem; z-index: 100;
  background: var(--surface); color: var(--ink); padding: 0.6rem 1rem; border-radius: 8px; box-shadow: var(--shadow);
}
.skip-link:focus { top: 1rem; }

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------- Header ---------- */
header.site {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
header.site .wrap { display: flex; align-items: center; gap: 1rem; min-height: 4.25rem; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; color: var(--ink); text-decoration: none; font-weight: 700; font-size: 1.2rem; flex: 0 1 auto; min-width: 88px; }
.brand picture { display: block; min-width: 0; }
.brand img { width: 121px; height: auto; } /* 362x102 source = 3x; shrinks proportionally on narrow screens */
.main-nav { margin-left: auto; display: flex; align-items: center; gap: 1.1rem; }
.main-nav a:not(.btn) { color: var(--ink-soft); text-decoration: none; font-size: 0.95rem; }
.main-nav a:not(.btn):hover { color: var(--ink); }
.lang { display: flex; gap: 0.15rem; font-size: 0.85rem; }
.lang a, .lang span { padding: 0.2rem 0.4rem; border-radius: 6px; text-decoration: none; color: var(--ink-soft); }
.lang [aria-current="page"] { background: var(--tint-b); color: var(--ink); font-weight: 600; }

@media (max-width: 860px) {
  .hide-mobile { display: none; }
}
@media (max-width: 520px) {
  .main-nav { gap: 0.5rem; }
  .main-nav .btn { padding: 0.55rem 0.85rem; font-size: 0.9rem; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  padding: 0.75rem 1.25rem; border-radius: 999px; font-weight: 600; text-decoration: none;
  border: 2px solid transparent; transition: transform 0.15s ease, background-color 0.15s ease;
  font-size: 1rem; line-height: 1.2;
}
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: color-mix(in srgb, var(--accent) 85%, black); }
.btn-ghost { border-color: var(--line); color: var(--ink); background: var(--surface); }
.btn-ghost:hover { border-color: var(--accent); }
.btn:hover { transform: translateY(-1px); }

/* ---------- Sections ---------- */
section { padding-block: clamp(3.5rem, 8vw, 6rem); }
section.alt { background: var(--bg-alt); }
.section-head { max-width: 46rem; margin-bottom: 2.5rem; }
.eyebrow {
  display: inline-block; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--highlight); margin-bottom: 0.75rem;
}
.lead { font-size: clamp(1.1rem, 2vw, 1.3rem); color: var(--ink-soft); max-width: 40rem; }

/* ---------- Hero ---------- */
.hero { padding-top: clamp(3rem, 7vw, 5.5rem); position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -30% -20% auto auto; width: 60vw; height: 60vw; max-width: 760px; max-height: 760px;
  background: radial-gradient(circle, color-mix(in srgb, var(--mark) 22%, transparent) 0%, transparent 65%);
  pointer-events: none; z-index: -1;
}
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 1.75rem 0 1rem; }
.hero-note { font-size: 0.92rem; color: var(--ink-soft); }
.hero-note li { display: inline; }
.hero-note ul { list-style: none; padding: 0; margin: 0; }
.hero-note li + li::before { content: " · "; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; } }

/* Chat mock-up */
.chat {
  margin-block: 0;
  background: var(--surface); border: 1px solid var(--line); border-radius: 28px; box-shadow: var(--shadow);
  padding: 1.1rem; max-width: 380px; margin-inline: auto; width: 100%;
}
.chat-top { display: flex; align-items: center; gap: 0.6rem; padding: 0.25rem 0.25rem 0.9rem; border-bottom: 1px solid var(--line); margin-bottom: 0.9rem; }
.chat-top img { width: 34px; height: 34px; border-radius: 9px; border: 1px solid var(--line); }
.chat-top strong { display: block; font-size: 0.95rem; line-height: 1.2; }
.chat-top small { color: var(--ink-soft); font-size: 0.78rem; }
.bubble { border-radius: 18px; padding: 0.65rem 0.9rem; font-size: 0.92rem; line-height: 1.45; margin: 0 0 0.6rem; max-width: 88%; }
.bubble.ai { background: var(--bg-alt); border-bottom-left-radius: 6px; }
.bubble.me { background: var(--accent); color: var(--accent-ink); margin-left: auto; border-bottom-right-radius: 6px; }
.chips { display: flex; gap: 0.35rem; flex-wrap: wrap; margin: 0.2rem 0 0.8rem; }
.chip { font-size: 0.8rem; border: 1px solid var(--line); border-radius: 999px; padding: 0.25rem 0.65rem; color: var(--ink-soft); }
.chip.on { background: var(--tint-a); border-color: var(--mark); color: var(--ink); font-weight: 600; }
.chat-foot { display: flex; align-items: center; gap: 0.5rem; margin-top: 0.4rem; font-size: 0.78rem; color: var(--ink-soft); }
.chat-foot svg { width: 16px; height: 16px; flex: none; }

/* ---------- Steps ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; list-style: none; padding: 0; margin: 0; counter-reset: step; }
.steps li {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 1.5rem;
  position: relative; counter-increment: step;
}
.steps li::before {
  content: counter(step); display: grid; place-items: center; width: 2.2rem; height: 2.2rem; border-radius: 50%;
  background: var(--tint-a); color: var(--heading); font-weight: 700; box-shadow: inset 0 0 0 2px var(--mark); margin-bottom: 1rem;
}
.steps p { color: var(--ink-soft); margin: 0; font-size: 0.97rem; }
.steps .time { display: inline-block; font-size: 0.8rem; font-weight: 600; color: var(--highlight); margin-bottom: 0.4rem; }
@media (max-width: 960px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .steps { grid-template-columns: 1fr; } }

.report { margin-top: 3rem; display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 2rem; align-items: start; }
.report ol { margin: 0; padding-left: 1.3rem; }
.report li { margin-bottom: 0.45rem; }
.report li::marker { color: var(--highlight); font-weight: 700; }
@media (max-width: 860px) { .report { grid-template-columns: 1fr; } }

/* ---------- Cards ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1.25rem; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 1.5rem; }
.card p { color: var(--ink-soft); margin: 0; font-size: 0.97rem; }
.card .icon { width: 2.5rem; height: 2.5rem; border-radius: 12px; background: var(--tint-a); display: grid; place-items: center; margin-bottom: 1rem; }
.card .icon svg { width: 1.3rem; height: 1.3rem; stroke: var(--heading); }

/* ---------- Anonymity diagram ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; } }
.diagram { margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 1.25rem; }
.diagram svg { width: 100%; }
.diagram text { font-family: var(--font); fill: var(--ink); }
.diagram .muted { fill: var(--ink-soft); }
.diagram .box { fill: var(--bg-alt); stroke: var(--line); stroke-width: 1.5; }
.diagram .box-a { fill: var(--tint-a); stroke: var(--mark); stroke-width: 1.5; }
.diagram .box-b { fill: var(--tint-b); stroke: var(--line-b); stroke-width: 1.5; }
.diagram .arrow { stroke: var(--ink-soft); stroke-width: 2; fill: none; }
.diagram .wall { stroke: #c0392b; stroke-width: 3; stroke-dasharray: 6 6; }
.diagram .arrowhead { fill: var(--ink-soft); }
.diagram figcaption { font-size: 0.88rem; color: var(--ink-soft); margin-top: 0.75rem; }

.checks { list-style: none; padding: 0; margin: 1.25rem 0 0; }
.checks li { position: relative; padding-left: 1.9rem; margin-bottom: 0.75rem; }
.checks li::before {
  content: ""; position: absolute; left: 0; top: 0.3em; width: 1.15rem; height: 1.15rem; border-radius: 50%;
  background: var(--tint-a) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5 10.5l3 3 7-7' fill='none' stroke='%2369BB26' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 80% no-repeat;
}

.stat-row { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 1.5rem; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 0.9rem 1.1rem; min-width: 9rem; flex: 1; }
.stat b { display: block; font-family: var(--font-serif); font-size: 2rem; line-height: 1; color: var(--heading); }
.stat span { font-size: 0.88rem; color: var(--ink-soft); }

/* ---------- JD-R ---------- */
.balance { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; margin-top: 1rem; }
.balance .card h3 { display: flex; align-items: center; gap: 0.5rem; }
.balance .res { border-top: 4px solid var(--mark); }
.balance .dem { border-top: 4px solid var(--line-b); }
.balance ul { margin: 0.5rem 0 0; padding-left: 1.1rem; color: var(--ink-soft); font-size: 0.97rem; }
@media (max-width: 640px) { .balance { grid-template-columns: 1fr; } }

/* ---------- Pricing ---------- */
.pricing { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 2rem; align-items: start; }
@media (max-width: 860px) { .pricing { grid-template-columns: 1fr; } }
.price-card { background: var(--surface); border: 2px solid var(--accent); border-radius: var(--radius-lg); padding: 1.75rem; box-shadow: var(--shadow); }
.price-card .unit { font-family: var(--font-serif); font-size: 1.6rem; margin-bottom: 0.25rem; }
.price-card p { color: var(--ink-soft); }

/* ---------- Privacy band ---------- */
.band { background: var(--navy-900); color: #eef3f8; padding-block: 2.5rem; }
.band .wrap { display: flex; flex-wrap: wrap; gap: 1rem 2rem; align-items: center; justify-content: space-between; }
.band p { margin: 0; max-width: 46rem; }
.band strong { color: #8fd14f; } /* 6.9:1 on navy-900 */
.band a { color: #ffffff; }

/* ---------- FAQ ---------- */
.faq { max-width: 50rem; }
.faq details { border-bottom: 1px solid var(--line); padding: 1rem 0; }
.faq summary {
  cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 1rem; align-items: baseline;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.4rem; line-height: 1; color: var(--highlight); transition: transform 0.2s ease; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { color: var(--ink-soft); margin: 0.75rem 0 0; }

/* ---------- CTA ---------- */
.cta { text-align: center; }
.cta .lead { margin-inline: auto; }
.cta .hero-actions { justify-content: center; }
.stores { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; margin-top: 1.5rem; }
.store {
  display: inline-flex; align-items: center; gap: 0.55rem; background: #111; color: #fff; text-decoration: none;
  border-radius: 10px; padding: 0.5rem 1rem; font-size: 0.8rem; line-height: 1.15; border: 1px solid #333;
}
.store svg { width: 22px; height: 22px; fill: #fff; }
.store b { display: block; font-size: 1.02rem; }

/* ---------- Footer ---------- */
footer.site { border-top: 1px solid var(--line); padding-block: 2.5rem; font-size: 0.92rem; color: var(--ink-soft); }
footer.site .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1.5rem; }
footer.site nav { display: flex; flex-wrap: wrap; gap: 1.25rem; }
footer.site a { color: var(--ink-soft); }

/* ---------- Legal pages ---------- */
.legal { max-width: 46rem; padding-block: 3rem 5rem; }
.legal h1 { font-size: clamp(2rem, 4vw, 2.6rem); }
.legal h2 { font-size: 1.4rem; margin-top: 2rem; }
.draft {
  background: var(--tint-b); border: 1px solid var(--line-b); border-radius: var(--radius); padding: 1rem 1.25rem; margin: 1.5rem 0 2rem;
}
.notfound { text-align: center; padding-block: 6rem; }
.notfound img { margin: 0 auto 1.5rem; width: 70px; height: 96px; }

/* ---------- Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .btn:hover { transform: none; }
}

@media print {
  header.site, .band, .stores, .hero::before { display: none; }
  body { background: #fff; color: #000; }
}

.balance + .cards { margin-top: 1.25rem; }