:root {
  --bg: #000;
  --panel: #07070c;
  --line: #1a1a28;
  --text: #f2f2fa;
  --muted: #8d8da6;
  --blue: #3b82ff;
  --violet: #8b3dff;
  --grad: linear-gradient(120deg, var(--blue), var(--violet));
  --rail: 76px;
  --wide: 264px;
  --ease: cubic-bezier(.2, .8, .2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { color-scheme: dark; }

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
}

/* ---------- TŁO: rozmyta poświata ---------- */
.aura {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(40vw 40vw at 82% 12%, rgba(139, 61, 255, .38), transparent 70%),
    radial-gradient(45vw 45vw at 95% 85%, rgba(59, 130, 255, .30), transparent 70%);
  animation: drift 18s ease-in-out infinite alternate;
}

@keyframes drift {
  to { transform: translate(-4vw, 3vh) scale(1.08); }
}

/* ---------- MENU BOCZNE ---------- */
.sidebar {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 20;
  width: var(--rail);
  padding: 20px 14px;
  background: rgba(0, 0, 0, .86);
  backdrop-filter: blur(14px);
  border-right: 1px solid var(--line);
  overflow: hidden;
  transition: width .35s var(--ease);
}

.sidebar.is-open { width: var(--wide); }

/* gradientowa linia na krawędzi menu */
.sidebar::after {
  content: "";
  position: absolute;
  top: 0; right: -1px; bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--blue), var(--violet), transparent 85%);
}

.sidebar__top {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 48px;
  margin-bottom: 28px;
}

.logo-img {
  height: 40px;
  width: auto;
  opacity: 0;
  transition: opacity .2s;
}

.sidebar.is-open .logo-img { opacity: 1; transition-delay: .15s; }

.burger {
  flex: none;
  width: 48px; height: 48px;
  display: grid;
  place-content: center;
  gap: 5px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 14px;
  cursor: pointer;
  transition: border-color .2s;
}

.burger:hover { border-color: var(--violet); }

.burger span {
  display: block;
  width: 20px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .3s var(--ease), opacity .2s;
}

.sidebar.is-open .burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.sidebar.is-open .burger span:nth-child(2) { opacity: 0; }
.sidebar.is-open .burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* zakładki */
.tabs {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tab {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  height: 48px;
  padding: 0 12px;
  background: transparent;
  border: 0;
  border-radius: 14px;
  color: var(--muted);
  font: 500 .98rem "Manrope", sans-serif;
  text-align: left;
  white-space: nowrap;
  cursor: pointer;
  transition: color .2s, background .2s;
}

.tab svg {
  flex: none;
  width: 24px; height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* tekst zakładek: niewidoczny w zwiniętym menu, wjeżdża z fade po rozwinięciu */
.tab__label {
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity .15s, transform .15s;
}

.sidebar.is-open .tab__label {
  opacity: 1;
  transform: none;
  transition: opacity .35s ease .15s, transform .35s var(--ease) .15s;
}

.tab:hover { color: var(--text); background: #0d0d18; }

a.tab { text-decoration: none; }

.tab.is-active {
  color: #fff;
  background: linear-gradient(120deg, rgba(59, 130, 255, .22), rgba(139, 61, 255, .22));
  box-shadow: inset 0 0 0 1px rgba(139, 61, 255, .55);
}

.tab.is-active svg { stroke: #b99bff; }

/* ---------- TREŚĆ ---------- */
.content {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  margin-left: var(--rail);
  padding: clamp(32px, 7vw, 96px);
  display: flex;
  align-items: center;
}

.panel {
  display: none;
  width: min(100%, 880px);
}

.panel.is-active {
  display: block;
  animation: enter .45s var(--ease);
}

@keyframes enter {
  from { opacity: 0; transform: translateY(14px); }
}

.hero {
  font-family: "Unbounded", sans-serif;
  font-weight: 900;
  font-size: clamp(2.4rem, 7vw, 5.6rem);
  line-height: 1.02;
  letter-spacing: -.03em;
  margin-bottom: 28px;
  background: linear-gradient(120deg, #fff 30%, #a9c4ff 60%, #b58cff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.title {
  font-family: "Unbounded", sans-serif;
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 3rem);
  letter-spacing: -.02em;
  margin-bottom: 20px;
}

.lead {
  max-width: 60ch;
  font-size: 1.15rem;
  color: #cfcfe4;
  margin-bottom: 28px;
}

.text {
  max-width: 62ch;
  color: var(--muted);
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- PRZYCISKI ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border: 0;
  border-radius: 999px;
  font: 700 1rem "Manrope", sans-serif;
  color: #fff;
  text-decoration: none;
  cursor: pointer;
  transition: transform .2s var(--ease), box-shadow .3s;
}

.btn:active { transform: scale(.97); }

.btn--glow {
  background: var(--grad);
  box-shadow: 0 0 0 rgba(139, 61, 255, 0);
}

.btn--glow:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 36px rgba(139, 61, 255, .55), 0 0 60px rgba(59, 130, 255, .25);
}

.btn--ghost {
  background: transparent;
  box-shadow: inset 0 0 0 1px #2c2c44;
}

.btn--ghost:hover { box-shadow: inset 0 0 0 1px var(--violet); }

/* ---------- KARTY ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
}

.card {
  padding: 26px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 20px;
  transition: border-color .25s;
}

.card:hover { border-color: rgba(139, 61, 255, .7); }

.card h3 {
  font-family: "Unbounded", sans-serif;
  font-weight: 500;
  font-size: 1.05rem;
  margin-bottom: 10px;
}

.card p { color: var(--muted); font-size: .95rem; }

/* ---------- BLOK POBIERANIA (gradientowa ramka) ---------- */
.dl {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 30px;
  border-radius: 24px;
  background: var(--panel);
  isolation: isolate;
}

.dl::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  padding: 1.5px;
  border-radius: inherit;
  background: var(--grad);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box exclude, linear-gradient(#000 0 0);
}

.dl__info { display: flex; flex-direction: column; }
.dl__info strong { font-family: "Unbounded", sans-serif; font-weight: 500; font-size: 1.1rem; }
.dl__info span { color: var(--muted); font-size: .92rem; }

/* ---------- MOBILE ---------- */
@media (max-width: 800px) {
  :root { --rail: 0px; }

  .sidebar { width: 76px; }
  .content { margin-left: 0; padding: 112px 24px 48px 24px; align-items: flex-start; }
  .sidebar:not(.is-open) { background: transparent; border-right: 0; backdrop-filter: none; }
  .sidebar:not(.is-open) .tabs { display: none; }
  .sidebar:not(.is-open)::after { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}