/* ==========================================================================
   Losta official website — shared stylesheet (light theme)
   No build step, no JS, no external fonts/CDN. Plain static CSS.
   Deployed to Cloudflare Pages (free).
   ========================================================================== */

:root {
  --violet-700: #6D28D9;
  --violet-600: #7C3AED;
  --violet-500: #8B5CF6;
  --violet-400: #A78BFA;
  --violet-200: #E5DEFB;
  --violet-50:  #F5F2FF;

  --ink:    #1A1726;
  --ink-2:  #565266;
  --ink-3:  #8A8599;
  --line:   #ECEAF3;
  --bg:     #FFFFFF;
  --bg-soft:#F7F6FB;

  --radius: 14px;
  --radius-lg: 20px;
  --shadow: 0 1px 2px rgba(20, 18, 28, .04), 0 10px 30px rgba(20, 18, 28, .06);
  --wrap: 1080px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

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

a { color: var(--violet-600); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 22px; }

/* ---------------------------------------------------------------- header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .86);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 66px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -.01em;
}
.brand:hover { text-decoration: none; }
.brand img { width: 32px; height: 32px; border-radius: 9px; }

.nav { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
.nav a { color: var(--ink-2); font-size: 14.5px; font-weight: 500; }
.nav a:hover { color: var(--violet-600); text-decoration: none; }

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

.hero {
  position: relative;
  overflow: hidden;
  color: var(--ink);
  background:
    radial-gradient(1000px 480px at 86% -12%, rgba(139, 92, 246, .12), rgba(139, 92, 246, 0) 60%),
    radial-gradient(900px 460px at 0% 0%, rgba(124, 58, 237, .07), rgba(124, 58, 237, 0) 55%),
    var(--bg-soft);
  padding: 88px 0 80px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr .95fr;
  gap: 56px;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--violet-700);
  border: 1px solid var(--violet-200);
  background: var(--violet-50);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 22px;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(34px, 5.2vw, 54px);
  line-height: 1.1;
  letter-spacing: -.025em;
  font-weight: 800;
}

.hero h1 .accent {
  color: var(--violet-600);
}

.hero p.lede {
  margin: 0 0 30px;
  font-size: 17.5px;
  line-height: 1.7;
  color: var(--ink-2);
  max-width: 34em;
}

.btn-row { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 46px;
  padding: 0 22px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform .12s ease, opacity .12s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  background: var(--violet-600);
  color: #fff;
  box-shadow: 0 10px 26px rgba(124, 58, 237, .22);
}
.btn-ghost {
  background: #fff;
  border-color: var(--line);
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--violet-400); }

.hero-note {
  margin-top: 26px;
  font-size: 13px;
  color: var(--ink-3);
}

/* product card floating in the hero */
.product-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow);
  text-align: center;
}
.product-card img {
  width: 78px;
  height: 78px;
  border-radius: 20px;
  margin: 0 auto 16px;
  box-shadow: 0 8px 22px rgba(124, 58, 237, .18);
}
.product-card .title { font-size: 19px; font-weight: 700; letter-spacing: -.01em; color: var(--ink); }
.product-card .sub {
  font-size: 13.5px;
  color: var(--ink-2);
  margin-top: 6px;
  line-height: 1.6;
}
.product-card .chips {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  justify-content: center;
  margin-top: 18px;
}
.chip {
  font-size: 12px;
  color: var(--violet-700);
  background: var(--violet-50);
  border: 1px solid var(--violet-200);
  padding: 4px 10px;
  border-radius: 999px;
}

/* --------------------------------------------------------------- sections */

section { padding: 66px 0; }
section.soft { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.section-head { max-width: 44em; margin-bottom: 38px; }
.section-head h2 {
  margin: 0 0 12px;
  font-size: clamp(24px, 3.2vw, 32px);
  letter-spacing: -.02em;
  font-weight: 750;
}
.section-head p { margin: 0; color: var(--ink-2); font-size: 16.5px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.card h3 {
  margin: 0 0 10px;
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: -.01em;
}
.card p { margin: 0; color: var(--ink-2); font-size: 14.5px; line-height: 1.68; }
.card ul { margin: 10px 0 0; padding-left: 20px; color: var(--ink-2); font-size: 14.5px; }
.card li { margin-bottom: 6px; }

.icon-badge {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  background: var(--violet-50);
  border: 1px solid var(--violet-200);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--violet-700);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 14px;
}

/* legal link grid on the home page */
.legal-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }

.legal-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  color: var(--ink);
  box-shadow: var(--shadow);
  transition: border-color .12s ease, transform .12s ease;
}
.legal-item:hover {
  text-decoration: none;
  border-color: var(--violet-400);
  transform: translateY(-2px);
}
.legal-item .k {
  font-weight: 650;
  font-size: 15.5px;
  margin-bottom: 4px;
  color: var(--ink);
}
.legal-item .d { font-size: 13.5px; color: var(--ink-3); line-height: 1.6; }
.legal-item .arrow { margin-left: auto; color: var(--violet-500); font-weight: 700; }

/* ------------------------------------------------------------------ prose */

.page-head {
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  padding: 56px 0 48px;
}
.page-head h1 {
  margin: 0 0 10px;
  font-size: clamp(26px, 3.6vw, 36px);
  letter-spacing: -.02em;
  font-weight: 780;
}
.page-head .meta { color: var(--ink-3); font-size: 14px; }

.prose { max-width: 780px; padding: 54px 0 72px; }
.prose h2 {
  margin: 42px 0 12px;
  font-size: 20px;
  letter-spacing: -.01em;
  font-weight: 700;
}
.prose h2:first-child { margin-top: 0; }
.prose h3 { margin: 26px 0 8px; font-size: 16.5px; font-weight: 650; }
.prose p { margin: 0 0 14px; color: var(--ink-2); }
.prose ul, .prose ol { margin: 0 0 16px; padding-left: 22px; color: var(--ink-2); }
.prose li { margin-bottom: 8px; }
.prose strong { color: var(--ink); font-weight: 650; }
.prose code {
  background: var(--violet-50);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1px 6px;
  font-size: 13.5px;
  color: var(--violet-700);
}

.callout {
  background: var(--violet-50);
  border: 1px solid var(--violet-200);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 0 0 22px;
  font-size: 15px;
  color: var(--ink-2);
}
.callout strong { color: var(--violet-700); }

table.tbl {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 20px;
  font-size: 14.5px;
}
table.tbl th, table.tbl td {
  border: 1px solid var(--line);
  padding: 11px 13px;
  text-align: left;
  vertical-align: top;
  color: var(--ink-2);
}
table.tbl th { background: var(--bg-soft); color: var(--ink); font-weight: 650; }

/* ----------------------------------------------------------------- footer */

.site-footer {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  padding: 54px 0 30px;
  font-size: 14px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--line);
}
.site-footer .brand { color: var(--ink); margin-bottom: 12px; }
.site-footer p { margin: 0; line-height: 1.7; color: var(--ink-2); font-size: 13.5px; }
.site-footer h4 {
  margin: 0 0 12px;
  color: var(--ink);
  font-size: 13px;
  letter-spacing: .1em;
  text-transform: uppercase;
  font-weight: 650;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 9px; }
.site-footer a { color: var(--ink-2); font-size: 13.5px; }
.site-footer a:hover { color: var(--violet-600); }
.footer-bottom {
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 12.5px;
  color: var(--ink-3);
}

/* ------------------------------------------------------------ responsive */

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 38px; }
  .cards { grid-template-columns: 1fr; }
  .legal-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 26px; }
}

@media (max-width: 620px) {
  .header-inner { min-height: auto; padding: 12px 0; flex-direction: column; align-items: flex-start; gap: 10px; }
  .nav { gap: 14px; }
  .hero { padding: 56px 0 52px; }
  section { padding: 48px 0; }
  .footer-grid { grid-template-columns: 1fr; }
  .prose { padding: 38px 0 52px; }
}