/* DualFiles website. Plain CSS, no build step: these files can go on any static host. */

:root {
  --bg: #ffffff;
  --bg-soft: #f4f6fa;
  --text: #14171f;
  --text-soft: #545b6b;
  --line: #e2e6ee;
  --card: #ffffff;
  --accent: #2b7cf3;
  --accent-dark: #1d63d0;
  --accent-text: #ffffff;
  --hero-bg: linear-gradient(180deg, #0f1522 0%, #172238 100%);
  --hero-text: #f2f5fb;
  --hero-soft: #a9b4c8;
  --radius: 14px;
  --shadow: 0 30px 80px rgba(10, 20, 40, 0.35), 0 4px 14px rgba(10, 20, 40, 0.18);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1118;
    --bg-soft: #141925;
    --text: #eef1f7;
    --text-soft: #a3abbb;
    --line: #252c3a;
    --card: #171c28;
    --hero-bg: linear-gradient(180deg, #090c13 0%, #121a2b 100%);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 16px; }

/* Top bar */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(15, 21, 34, 0.96);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.nav .wrap { display: flex; align-items: center; gap: 24px; height: 58px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--hero-text); font-weight: 650; font-size: 18px; }
.brand:hover { text-decoration: none; }
.brand img { width: 30px; height: 30px; }
.nav-links { display: flex; gap: 22px; margin-left: auto; align-items: center; }
.nav-links a { color: var(--hero-soft); font-size: 15px; }
.nav-links a:hover { color: var(--hero-text); text-decoration: none; }
.nav-links .button { color: var(--accent-text); }

/* Buttons */
.button {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: 999px;
  background: var(--accent); color: var(--accent-text);
  font-weight: 600; font-size: 16px; white-space: nowrap;
  transition: background 0.15s ease, transform 0.15s ease;
}
.button:hover { background: var(--accent-dark); text-decoration: none; transform: translateY(-1px); }
.button.small { padding: 7px 16px; font-size: 14px; }
.button.ghost { background: transparent; color: var(--hero-text); box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.25); }
.button.ghost:hover { background: rgba(255, 255, 255, 0.08); }

/* Hero */
.hero { background: var(--hero-bg); color: var(--hero-text); padding: 72px 0 0; overflow: hidden; }
.hero-text { text-align: center; max-width: 760px; margin: 0 auto; }
.eyebrow { display: inline-block; font-size: 14px; font-weight: 600; letter-spacing: 0.04em; color: #8fb8ff;
  background: rgba(43, 124, 243, 0.14); padding: 5px 12px; border-radius: 999px; margin-bottom: 18px; }
.hero h1 { font-size: clamp(38px, 6.4vw, 66px); line-height: 1.04; letter-spacing: -0.025em; margin: 0 0 18px; font-weight: 750; }
.hero p.lead { font-size: clamp(18px, 2.2vw, 21px); color: var(--hero-soft); margin: 0 auto 30px; max-width: 640px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.requirements { margin-top: 16px; font-size: 14px; color: var(--hero-soft); }
.hero-shot { margin: 56px auto 0; max-width: 1080px; padding: 0 16px; }
.hero-shot img { border-radius: 12px 12px 0 0; box-shadow: var(--shadow); }

/* Sections */
section { padding: 88px 0; }
section.soft { background: var(--bg-soft); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 48px; }
.section-head h2 { font-size: clamp(30px, 4vw, 42px); letter-spacing: -0.02em; line-height: 1.12; margin: 0 0 12px; }
.section-head p { color: var(--text-soft); margin: 0; font-size: 18px; }

/* Feature cards */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.feature .icon { width: 38px; height: 38px; border-radius: 10px; background: rgba(43, 124, 243, 0.12); color: var(--accent);
  display: grid; place-items: center; margin-bottom: 14px; }
.feature .icon svg { width: 20px; height: 20px; }
.feature h3 { margin: 0 0 6px; font-size: 18px; letter-spacing: -0.01em; }
.feature p { margin: 0; color: var(--text-soft); font-size: 15.5px; }
kbd { font: 600 13px/1 -apple-system, BlinkMacSystemFont, sans-serif; background: var(--bg-soft); border: 1px solid var(--line);
  border-bottom-width: 2px; border-radius: 5px; padding: 2px 6px; color: var(--text); }

/* Spotlight */
.spotlight { display: grid; grid-template-columns: 0.9fr 1.4fr; gap: 48px; align-items: center; }
.spotlight h2 { font-size: clamp(28px, 3.6vw, 38px); letter-spacing: -0.02em; line-height: 1.15; margin: 0 0 14px; }
.spotlight p { color: var(--text-soft); margin: 0 0 14px; }
.spotlight img { border-radius: 10px; box-shadow: 0 18px 50px rgba(10, 20, 40, 0.25); }

/* Price */
.price-card { max-width: 460px; margin: 0 auto; background: var(--card); border: 1px solid var(--line); border-radius: 20px;
  padding: 36px 32px; text-align: center; box-shadow: 0 12px 40px rgba(10, 20, 40, 0.08); }
.price-card img { width: 72px; height: 72px; margin: 0 auto 12px; }
.price-card h3 { margin: 0; font-size: 22px; }
.price { font-size: 56px; font-weight: 750; letter-spacing: -0.03em; margin: 6px 0 2px; }
.price-note { color: var(--text-soft); margin: 0 0 22px; }
.price-card ul { list-style: none; padding: 0; margin: 0 0 26px; text-align: left; display: grid; gap: 9px; }
.price-card li { padding-left: 28px; position: relative; font-size: 15.5px; }
.price-card li::before { content: ""; position: absolute; left: 4px; top: 6px; width: 12px; height: 7px;
  border-left: 2.5px solid var(--accent); border-bottom: 2.5px solid var(--accent); transform: rotate(-45deg); }
.price-card .button { width: 100%; padding: 14px 22px; font-size: 17px; }
.fine { font-size: 13.5px; color: var(--text-soft); margin: 14px 0 0; }

/* FAQ */
.faq { max-width: 760px; margin: 0 auto; }
.faq details { border-bottom: 1px solid var(--line); padding: 18px 0; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 17.5px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--text-soft); font-weight: 400; font-size: 22px; line-height: 1; }
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--text-soft); margin: 10px 0 0; }

/* Footer */
footer { border-top: 1px solid var(--line); padding: 32px 0 44px; color: var(--text-soft); font-size: 14.5px; }
footer .wrap { display: flex; gap: 20px; align-items: center; flex-wrap: wrap; }
footer nav { display: flex; gap: 20px; margin-left: auto; flex-wrap: wrap; }
footer a { color: var(--text-soft); }

/* Plain pages (privacy, terms) */
.page { max-width: 760px; margin: 0 auto; padding: 64px 16px 88px; }
.page h1 { font-size: clamp(32px, 5vw, 44px); letter-spacing: -0.02em; margin: 0 0 6px; }
.page .updated { color: var(--text-soft); margin: 0 0 36px; }
.page h2 { font-size: 22px; margin: 36px 0 8px; }
.page p, .page li { color: var(--text-soft); }
.page strong { color: var(--text); }

@media (max-width: 900px) {
  .features { grid-template-columns: repeat(2, 1fr); }
  .spotlight { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .features { grid-template-columns: 1fr; }
  .nav-links a:not(.button) { display: none; }
  .hero { padding-top: 48px; }
  section { padding: 64px 0; }
  .price-card { padding: 28px 20px; }
}