:root {
  --bg: #f5f7fa;
  --bg-alt: #ffffffcc;
  --bg-gradient: linear-gradient(135deg,#eef2f7 0%,#dfe7ef 100%);
  --border: 1px solid rgba(0,0,0,0.06);
  --text: #1f2b38;
  --text-soft: #546577;
  --accent: #2f80ed;
  --accent-hover: #1b64c2;
  --radius: 14px;
  --shadow-sm: 0 2px 4px -1px rgba(0,0,0,0.08),0 1px 2px rgba(0,0,0,0.06);
  --shadow: 0 4px 18px -2px rgba(0,0,0,0.12),0 2px 6px rgba(0,0,0,0.08);
  --glass: rgba(255,255,255,0.55);
  --blur: 18px;
  --trans: 0.28s cubic-bezier(.4,.2,.2,1);
  --code-bg: #1f2933;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1419;
    --bg-alt: #131b23cc;
    --bg-gradient: linear-gradient(135deg,#18222c 0%,#0f1419 100%);
    --border: 1px solid rgba(255,255,255,0.08);
    --text: #e6edf3;
    --text-soft: #94a3b4;
    --accent: #4799ff;
    --accent-hover: #1f75d6;
    --glass: rgba(28,34,41,0.55);
    --code-bg: #0d1117;
  }
  .page-header {
    background-image: linear-gradient(135deg,#18324a,#0f202f);
  }
}

html, body { scroll-behavior: smooth; }
body {
  background: var(--bg-gradient);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
  margin: 0;
}

.page-header {
  background: linear-gradient(125deg,var(--accent) 0%, var(--accent-hover) 100%);
  padding: 4rem 2rem 3.2rem;
  box-shadow: var(--shadow);
  text-align: center;
  position: relative;
  overflow: hidden;
  color: #fff;
}

.project-name {
  margin: 0 0 .5rem;
  font-size: clamp(2.2rem,3vw,3rem);
  font-weight: 700;
  letter-spacing: -0.5px;
  text-shadow: 0 4px 22px rgba(0,0,0,0.22);
}

.project-tagline {
  margin: 0 0 1.2rem;
  font-weight: 400;
  color: rgba(255,255,255,0.9);
}

.main-content {
  max-width: 1050px;
  padding: clamp(1.5rem,2.2vw + 0.5rem,3rem) 2rem 4rem;
  margin: 0 auto;
}

h2 { margin-top: 3.2rem; font-size: clamp(1.55rem,2.1vw,2.05rem); font-weight: 600; }
h3 { margin-top: 2.2rem; font-size: clamp(1.15rem,1.4vw,1.35rem); font-weight: 600; }

p, li { color: var(--text-soft); font-size: 1.02rem; }

.download-button {
  --btn-bg: var(--accent);
  --btn-bg-hover: var(--accent-hover);
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  margin: .4rem .5rem 0;
  padding: 0.9rem 1.35rem;
  background: linear-gradient(145deg,var(--btn-bg),var(--btn-bg-hover));
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  border-radius: 12px;
  box-shadow: 0 6px 18px -6px rgba(0,0,0,0.35), 0 2px 5px rgba(0,0,0,0.2);
  position: relative;
  overflow: hidden;
  transition: var(--trans);
}
.download-button:hover { transform: translateY(-3px); }
.download-button:active { transform: translateY(0); box-shadow: var(--shadow-sm); }

.features {
  display: grid;
  gap: 1.6rem;
  grid-template-columns: repeat(auto-fit,minmax(220px,1fr));
  margin: 2.5rem 0 1rem;
  padding: 0;
}

.feature {
  background: var(--glass);
  backdrop-filter: blur(var(--blur)) saturate(160%);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(160%);
  border: var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.15rem 1.35rem;
  box-shadow: var(--shadow-sm);
  transition: var(--trans);
}
.feature:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.feature h3 { margin: 0 0 .6rem; font-size: 1.05rem; }
.feature p { margin: 0; font-size: .9rem; line-height: 1.4; }

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

code {
  font-family: ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  background: var(--code-bg);
  color: #eaeef2;
  padding: .2rem .45rem;
  border-radius: 6px;
  font-size: .85rem;
}

blockquote {
  margin: 2rem 0;
  padding: 1rem 1.25rem;
  border-left: 4px solid var(--accent);
  background: var(--glass);
  border-radius: 0 10px 10px 0;
  color: var(--text-soft);
}

footer {
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  background: var(--glass);
  border-top: var(--border);
  margin-top: 4rem;
  padding: 1.5rem 1rem;
  font-size: .8rem;
  text-align: center;
  color: var(--text-soft);
}