:root {
  --purple: #6a3df0;
  --purple-dark: #5a2fd8;
  --ink: #16121f;
  --muted: #5b5670;
  --bg: #ffffff;
  --bg-soft: #f6f4ff;
  --line: #e8e3f7;
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

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

h1,
h2,
h3 {
  line-height: 1.2;
  letter-spacing: -0.02em;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
  color: var(--ink);
}
.brand img {
  border-radius: 7px;
}
.site-header nav {
  display: flex;
  gap: 22px;
  font-weight: 600;
  font-size: 14px;
}
.site-header nav a {
  color: var(--muted);
}

/* Layout */
section {
  max-width: 1000px;
  margin: 0 auto;
  padding: 72px 24px;
}
h2 {
  font-size: clamp(26px, 4vw, 34px);
  text-align: center;
  margin: 0 0 8px;
}
.section-sub {
  text-align: center;
  color: var(--muted);
  max-width: 620px;
  margin: 0 auto 36px;
}

/* Hero */
.hero {
  text-align: center;
  padding-top: 80px;
  padding-bottom: 60px;
}
.eyebrow {
  display: inline-block;
  background: var(--bg-soft);
  color: var(--purple);
  font-weight: 700;
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 999px;
  margin: 0 0 18px;
}
.hero h1 {
  font-size: clamp(32px, 6vw, 54px);
  max-width: 820px;
  margin: 0 auto 18px;
}
.lede {
  font-size: clamp(16px, 2.2vw, 20px);
  color: var(--muted);
  max-width: 680px;
  margin: 0 auto 30px;
}
.cta-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 15px;
}
.btn.primary {
  background: var(--purple);
  color: #fff;
}
.btn.primary:hover {
  background: var(--purple-dark);
  text-decoration: none;
}
.btn.ghost {
  border: 1.5px solid var(--line);
  color: var(--ink);
}
.btn.ghost:hover {
  border-color: var(--purple);
  text-decoration: none;
}
.byok {
  margin-top: 26px;
  color: var(--muted);
  font-size: 14px;
}

/* Hero demo */
.demo {
  max-width: 560px;
  margin: 42px auto 0;
}
.demo-window {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #1e1a2e;
  box-shadow: 0 24px 60px rgba(106, 61, 240, 0.22);
  overflow: hidden;
  text-align: left;
}
.demo-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 11px 14px;
  background: #2a2440;
  border-bottom: 1px solid #372f52;
}
.demo-bar .dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #4b4368;
}
.demo-bar .dot:nth-child(1) { background: #ff5f57; }
.demo-bar .dot:nth-child(2) { background: #febc2e; }
.demo-bar .dot:nth-child(3) { background: #28c840; }
.demo-bar em {
  margin-left: 8px;
  color: #9c93c4;
  font-style: normal;
  font-size: 12px;
  font-weight: 600;
}
.demo-body {
  padding: 16px;
}
.demo-code {
  margin: 0 0 14px;
  padding: 14px;
  background: #15121f;
  border-radius: 9px;
  color: #d7d0ee;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12.5px;
  line-height: 1.55;
  white-space: pre-wrap;
  min-height: 128px;
}
.demo-code .caret {
  display: inline-block;
  width: 7px;
  height: 15px;
  vertical-align: text-bottom;
  background: var(--purple);
  animation: blink 1s steps(1) infinite;
}
@keyframes blink {
  50% { opacity: 0; }
}
.demo-actions {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}
.demo-btn {
  flex: 1;
  padding: 8px;
  border: 1px solid #3a3358;
  border-radius: 8px;
  background: #241f38;
  color: #b7aede;
  font-weight: 700;
  font-size: 13px;
  transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease;
}
/* Refactor is the core action — give it more weight in the demo bar. */
.demo-btn.primary {
  flex: 2;
  border-color: var(--purple);
  color: #d7cbff;
}
.demo-btn.active {
  background: var(--purple);
  color: #fff;
  border-color: var(--purple);
  transform: translateY(-1px);
}
.demo-result {
  min-height: 96px;
  padding: 13px 14px;
  background: #15121f;
  border-radius: 9px;
  color: #cfc8ea;
  font-size: 13px;
  line-height: 1.6;
  white-space: pre-wrap;
}
.demo-result.streaming::after {
  content: "▋";
  color: var(--purple);
  animation: blink 1s steps(1) infinite;
}

/* Features */
.features {
  background: var(--bg-soft);
  max-width: none;
  border-radius: 0;
}
.features > * {
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
}
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 36px;
}
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
}
.card .ico {
  font-size: 30px;
  margin-bottom: 10px;
}
.card h3 {
  margin: 0 0 8px;
  font-size: 20px;
}
.card p {
  margin: 0;
  color: var(--muted);
}
.card .tag {
  display: inline-block;
  vertical-align: middle;
  margin-left: 6px;
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--purple);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.card .tag.lite {
  background: var(--bg-soft);
  color: var(--purple);
  border: 1px solid var(--line);
}

/* Platforms */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.platform {
  display: block;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  color: var(--ink);
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
}
.platform:hover {
  text-decoration: none;
  transform: translateY(-3px);
  border-color: var(--purple);
  box-shadow: 0 10px 30px rgba(106, 61, 240, 0.12);
}
.platform h3 {
  margin: 0 0 6px;
  font-size: 19px;
}
.platform p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 14px;
}
.platform code {
  background: var(--bg-soft);
  padding: 2px 6px;
  border-radius: 5px;
  font-size: 12px;
}
.platform .install {
  display: block;
  background: #15121f;
  color: #cfc8ea;
  padding: 8px 10px;
  border-radius: 7px;
  font-size: 12px;
  margin-bottom: 12px;
  overflow-x: auto;
  white-space: nowrap;
}

.platform .go {
  font-weight: 700;
  color: var(--purple);
  font-size: 14px;
}
.platform.soon {
  cursor: default;
  opacity: 0.7;
}
.platform.soon:hover {
  transform: none;
  border-color: var(--line);
  box-shadow: none;
}

/* How */
.steps {
  list-style: none;
  padding: 0;
  margin: 0 auto;
  max-width: 640px;
  display: grid;
  gap: 22px;
}
.steps li {
  display: flex;
  gap: 18px;
  align-items: flex-start;
}
.steps .n {
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--purple);
  color: #fff;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}
.steps h3 {
  margin: 4px 0 4px;
  font-size: 19px;
}
.steps p {
  margin: 0;
  color: var(--muted);
}
.privacy {
  margin: 40px auto 0;
  max-width: 640px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  background: var(--bg-soft);
  border-radius: var(--radius);
  padding: 18px 22px;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  text-align: center;
  padding: 28px 24px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 720px) {
  .cards,
  .grid {
    grid-template-columns: 1fr;
  }
  .site-header nav {
    display: none;
  }
}