:root {
  color-scheme: light;
  --paper: #ffffff;
  --surface: #f4f4f4;
  --ink: #111111;
  --muted: #5c5c5c;
  --line: #d6d6d6;
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.08);
  --focus: rgba(141, 123, 234, 0.28);
  --accent: #8d7bea;
  --accent-strong: #7462dc;
  font-family: Quicksand, ui-rounded, "Segoe UI", system-ui, sans-serif;
  font-synthesis: none;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --paper: #000000;
    --surface: #161616;
    --ink: #f5f5f5;
    --muted: #a3a3a3;
    --line: #3a3a3a;
    --shadow: 0 18px 48px rgba(0, 0, 0, 0.45);
    --focus: rgba(183, 167, 255, 0.28);
    --accent: #9e8df4;
    --accent-strong: #b7a7ff;
  }
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  height: 100vh;
  height: 100dvh;
  margin: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  overflow: hidden;
  color: var(--ink);
  background: var(--paper);
}

button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

.site-header {
  width: min(1180px, calc(100% - 40px));
  margin: 14px auto 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 0;
  border: 0;
  color: var(--ink);
  background: none;
  font-weight: 700;
  letter-spacing: -0.02em;
  cursor: pointer;
}

.app-logo {
  display: inline-block;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  background: center / contain no-repeat url("assets/logo.svg");
}

.tab-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  min-width: 0;
}

.tab-nav .tab-link {
  min-width: 88px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
}

.tab-nav .tab-link:hover {
  color: var(--ink);
  background: var(--surface);
}

.tab-nav .tab-link.active {
  color: var(--ink);
  background: var(--surface);
  border-color: var(--line);
  font-weight: 700;
}

.page-frame {
  width: min(1180px, calc(100% - 40px));
  height: 100%;
  min-height: 0;
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--paper);
  box-shadow: var(--shadow);
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  outline: none;
}

.tab-panel {
  min-height: 100%;
  padding: clamp(30px, 5vw, 64px);
  animation: panel-in 0.28s ease both;
}

.tab-panel[hidden] { display: none; }

@keyframes panel-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

#panel-home { display: flex; align-items: center; }
#panel-home[hidden] { display: none; }

.eyebrow {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1, h2, h3, p { margin-top: 0; }

h1, h2 {
  max-width: 780px;
  margin-bottom: 24px;
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.02;
}

h1 { font-size: clamp(3.1rem, 7.2vw, 6.2rem); }
h2 { font-size: clamp(2.6rem, 5.6vw, 4.6rem); }
h3 { font-size: 2rem; font-weight: 700; letter-spacing: -0.03em; }

.lede {
  max-width: 650px;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.27rem);
  line-height: 1.65;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 50px;
  padding: 0 22px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  color: var(--ink);
  background: transparent;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.button:hover { transform: translateY(-2px); }
.button.primary {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}
.button.primary:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}
.button.secondary:hover { background: var(--surface); }

.button:focus-visible,
.tab-link:focus-visible,
.footer-link:focus-visible,
.brand:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.panel-heading { margin-bottom: 28px; }
.panel-heading h2 { margin-bottom: 18px; }

.feature-grid,
.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.feature-card,
.product-card {
  position: relative;
  padding: 24px 28px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
  overflow: hidden;
}

.accent-card {
  border-color: color-mix(in srgb, var(--accent) 28%, var(--line));
  background-color: var(--paper);
  background-image: linear-gradient(145deg, transparent 42%, color-mix(in srgb, var(--accent) 14%, transparent));
}

.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr);
  max-width: 640px;
}

.contact-form {
  display: grid;
  gap: 20px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--surface);
}

.contact-form label {
  display: grid;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 700;
}

.optional {
  color: var(--muted);
  font-weight: 500;
}

input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 13px 14px;
  color: var(--ink);
  background: var(--paper);
  outline: none;
}

textarea { resize: vertical; line-height: 1.5; }

input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--focus);
}

.form-note {
  margin: -4px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.5;
}

.form-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}

.form-status { color: var(--muted); font-size: 0.85rem; }
.form-status.success { color: var(--ink); }
.form-status.error { color: #c43c3c; }

.contact-honeypot {
  position: absolute !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.site-footer {
  width: min(1180px, calc(100% - 40px));
  margin: 10px auto 14px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  color: var(--muted);
  font-size: 0.8rem;
}

.footer-link {
  padding: 0;
  border: 0;
  color: inherit;
  background: none;
  text-decoration: underline;
  cursor: pointer;
}

@media (max-width: 800px) {
  .site-header { margin-top: 10px; }
  .brand > span:last-child { font-size: 0.92rem; }
  .tab-nav .tab-link { min-width: auto; padding: 9px 12px; }
  .page-frame { border-radius: 20px; }
  .contact-layout { max-width: none; }
}

@media (max-width: 520px) {
  .site-header, .page-frame, .site-footer { width: calc(100% - 24px); }
  .site-header { gap: 8px; }
  .brand { flex: 0 0 auto; }
  .brand > span:last-child {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }
  .app-logo { width: 30px; height: 30px; }
  .tab-nav { gap: 2px; }
  .tab-nav .tab-link { padding: 8px 9px; font-size: 0.88rem; }
  .tab-panel { padding: 28px 20px; }
  h1 { font-size: clamp(2.4rem, 12vw, 3.4rem); }
  .feature-card, .product-card, .contact-form { padding: 20px; }
  .site-footer { margin-top: 8px; margin-bottom: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}