:root {
  --bg: #0f1216;
  --card: #141922;
  --text: #e7ebf2;
  --muted: #a7b0c0;
  --line: rgba(255,255,255,0.08);
  --accent: #9fb7ff;
  --accent2: #ffcf8b;
  --shadow: 0 12px 40px rgba(0,0,0,0.35);
  --radius: 18px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(1200px 700px at 20% 0%, rgba(159,183,255,0.10), transparent 60%),
              radial-gradient(900px 600px at 90% 10%, rgba(255,207,139,0.08), transparent 55%),
              var(--bg);
  color: var(--text);
  line-height: 1.55;
}

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

.container {
  width: min(980px, calc(100% - 40px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  background: rgba(15,18,22,0.65);
  border-bottom: 1px solid var(--line);
  z-index: 10;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}

.brand {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  color: var(--text);
  text-decoration: none;
}

.brand-logo {
  width: 20px;
  height: 20px;
  object-fit: contain;
  display: inline-block;
  border-radius: 4px;
}

.brand-text {
  font-weight: 650;
  letter-spacing: 0.2px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 14px;
}

.button {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(159,183,255,0.12);
  border: 1px solid rgba(159,183,255,0.18);
  color: var(--text);
  text-decoration: none;
}

.button:hover {
  background: rgba(159,183,255,0.18);
  text-decoration: none;
}

.card {
  margin: 28px 0 40px;
  padding: 28px;
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

h1, h2, h3 { line-height: 1.2; margin: 0.9em 0 0.4em; }
h1 { font-size: clamp(32px, 4vw, 44px); margin-top: 0; }
h2 { font-size: 24px; margin-top: 1.6em; }
h3 { font-size: 18px; }

.lead { font-size: 18px; color: rgba(231,235,242,0.92); max-width: 65ch; }

.grid {
  display: grid;
  gap: 14px;
}

@media (min-width: 840px) {
  .grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
  .grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
}

.panel {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(20,25,34,0.72);
}

details {
  margin: 14px 0;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(20,25,34,0.72);
  overflow: clip;
}

summary {
  position: relative;
  padding: 12px 44px 12px 14px;
  cursor: pointer;
  font-weight: 650;
  list-style: none;
  transition: background-color 160ms ease;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 14px;
  width: 8px;
  height: 8px;
  border-right: 2px solid rgba(231,235,242,0.72);
  border-bottom: 2px solid rgba(231,235,242,0.72);
  transform: translateY(-60%) rotate(45deg);
  transition: transform 160ms ease;
}

details[open] > summary::after {
  transform: translateY(-35%) rotate(225deg);
}

summary:hover {
  background: rgba(159,183,255,0.10);
}

summary:focus-visible {
  outline: 2px solid rgba(159,183,255,0.65);
  outline-offset: -2px;
}

details > :not(summary) {
  margin: 0;
  padding: 0 14px 14px;
}

details > :not(summary) + :not(summary) {
  margin-top: 10px;
}

.muted { color: var(--muted); }

.hr {
  height: 1px;
  background: var(--line);
  margin: 22px 0;
}

.screens {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 14px;
}

.screens img {
  width: 100%;
  height: auto;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.15);
}

.lightbox-trigger {
  padding: 0;
  border: 0;
  border-radius: 14px;
  background: transparent;
  line-height: 0;
  cursor: zoom-in;
}

.lightbox-trigger:hover img {
  border-color: rgba(159,183,255,0.45);
}

.lightbox-trigger:focus-visible {
  outline: 2px solid rgba(159,183,255,0.75);
  outline-offset: 2px;
}

body.lightbox-open {
  overflow: hidden;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(6, 8, 12, 0.88);
}

.lightbox[hidden] {
  display: none;
}

.lightbox-dialog {
  position: relative;
  width: min(96vw, 1200px);
  max-height: 90vh;
  display: grid;
  place-items: center;
}

.lightbox-image {
  width: auto;
  max-width: 90vw;
  height: auto;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 12px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.lightbox-close,
.lightbox-nav {
  position: absolute;
  border: 1px solid rgba(231,235,242,0.35);
  background: rgba(15,18,22,0.85);
  color: var(--text);
}

.lightbox-close {
  top: 10px;
  right: 10px;
}

.lightbox-prev {
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
}

.lightbox-next {
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
}

.lightbox-close:hover,
.lightbox-nav:hover {
  background: rgba(30,36,48,0.95);
}

.lightbox-close:focus-visible,
.lightbox-nav:focus-visible {
  outline: 2px solid rgba(159,183,255,0.8);
  outline-offset: 2px;
}

@media (max-width: 640px) {
  .lightbox-close,
  .lightbox-nav {
    padding: 10px 12px;
  }

  .lightbox-prev {
    left: 4px;
  }

  .lightbox-next {
    right: 4px;
  }
}

code, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

form {
  margin-top: 14px;
  display: grid;
  gap: 12px;
}

label { display: grid; gap: 6px; font-weight: 600; }
input, textarea {
  padding: 12px 12px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(15,18,22,0.6);
  color: var(--text);
}
input:focus, textarea:focus {
  outline: 2px solid rgba(159,183,255,0.35);
  outline-offset: 1px;
}

button {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(159,183,255,0.25);
  background: rgba(159,183,255,0.16);
  color: var(--text);
  font-weight: 650;
  cursor: pointer;
}
button:hover { background: rgba(159,183,255,0.22); }

.hidden { display: none; }

.footer {
  border-top: 1px solid var(--line);
  padding: 22px 0 34px;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
}