:root {
  --bg: #0f1117;
  --bg-2: #171a23;
  --bg-3: #1e222d;
  --line: #2a2f3a;
  --text: #e8eaf0;
  --muted: #8b93a5;
  --accent: #4f8cff;
  --accent-2: #6ee7b7;
  --radius: 14px;
  --wrap: 1140px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); }
.center { text-align: center; }
.center .btn { margin: 0 auto; }

/* ── header ─────────────────────────────────── */
.header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(15, 17, 23, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 700; font-size: 20px; display: flex; align-items: center; gap: 8px; }
.logo__mark { color: var(--accent); }
.nav { display: flex; align-items: center; gap: 22px; }
.nav a { color: var(--muted); font-weight: 500; }
.nav a:hover, .nav a.is-active { color: var(--text); }
.nav .btn { color: #fff; }

/* ── buttons ────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 12px 22px; border-radius: 10px; border: 1px solid transparent;
  background: var(--accent); color: #fff; font-weight: 600; cursor: pointer;
  transition: transform .12s ease, background .15s ease, border-color .15s;
  font-size: 15px;
}
.btn:hover { transform: translateY(-1px); background: #3f7cf0; }
.btn--sm { padding: 8px 16px; font-size: 14px; }
.btn--lg { padding: 15px 30px; font-size: 16px; }
.btn--ghost { background: transparent; border-color: var(--line); color: var(--text); }
.btn--ghost:hover { background: var(--bg-3); }

/* ── hero ───────────────────────────────────── */
.hero { padding: 72px 0 40px; text-align: center; }
.hero--sm { padding: 48px 0 20px; }
.hero h1 { font-size: clamp(30px, 5vw, 52px); line-height: 1.1; margin: 0 0 18px; letter-spacing: -0.02em; }
.lead { font-size: 18px; color: var(--muted); max-width: 640px; margin: 0 auto 26px; }
.hero__actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero__stats { display: flex; gap: 40px; justify-content: center; margin-top: 48px; flex-wrap: wrap; }
.hero__stats div { display: flex; flex-direction: column; }
.hero__stats b { font-size: 26px; }
.hero__stats span { color: var(--muted); font-size: 14px; }

/* ── sections ───────────────────────────────── */
.section { padding: 42px 0; }
.section__head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 22px; }
.section h2 { font-size: 26px; }
.link { color: var(--accent); font-weight: 500; }

/* ── grid & cards ───────────────────────────── */
.grid { display: grid; gap: 22px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column;
  transition: transform .15s ease, border-color .15s;
}
.card:hover { transform: translateY(-3px); border-color: #39414f; }
.card__media { position: relative; aspect-ratio: 16/10; background: var(--bg-3); }
.card__media img { width: 100%; height: 100%; object-fit: cover; }
.badge {
  position: absolute; top: 12px; left: 12px; background: rgba(15,17,23,.8);
  padding: 4px 10px; border-radius: 999px; font-size: 12px; color: var(--text);
}
.card__body { padding: 16px 18px 18px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.card__body h3 { margin: 0; font-size: 18px; }
.card__foot { margin-top: auto; display: flex; align-items: center; justify-content: space-between; padding-top: 12px; }
.price b { font-size: 18px; }
.price s { color: var(--muted); margin-left: 6px; font-size: 14px; }

.cats .cat {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 20px; text-align: center; font-weight: 600;
  transition: border-color .15s, background .15s;
}
.cats .cat:hover { border-color: var(--accent); background: var(--bg-3); }

/* ── filters / chips ────────────────────────── */
.filters { display: flex; gap: 10px; flex-wrap: wrap; margin: 10px 0 26px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 8px 15px;
  border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: 14px;
}
.chip:hover { border-color: var(--accent); color: var(--text); }
.chip.is-active { background: var(--accent); border-color: var(--accent); color: #fff; }
.chip--static { padding: 5px 12px; cursor: default; }
.tags { display: flex; gap: 8px; flex-wrap: wrap; }

/* ── product ────────────────────────────────── */
.crumbs { color: var(--muted); font-size: 14px; padding: 22px 0 4px; }
.crumbs a:hover { color: var(--text); }
.product { display: grid; grid-template-columns: 1.1fr 1fr; gap: 40px; padding: 24px 0; }
.product__media { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--bg-2); }
.product__info h1 { font-size: 32px; margin: 12px 0; }
.product__price { display: flex; align-items: baseline; gap: 12px; margin: 20px 0; }
.product__price b { font-size: 30px; }
.product__price s { color: var(--muted); }
.product__actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 24px; }
.features { list-style: none; padding: 0; margin: 0 0 20px; display: grid; gap: 8px; }
.features li { padding-left: 26px; position: relative; }
.features li::before { content: "✓"; position: absolute; left: 0; color: var(--accent-2); font-weight: 700; }

/* ── forms ──────────────────────────────────── */
.form { display: grid; gap: 16px; max-width: 620px; }
.form label { display: grid; gap: 6px; font-weight: 500; font-size: 14px; }
input, textarea, select {
  width: 100%; padding: 12px 14px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--bg-2); color: var(--text);
  font: inherit; outline: none;
}
input:focus, textarea:focus, select:focus { border-color: var(--accent); }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form__note { font-size: 13px; }
.form__error { color: #ff7b7b; background: rgba(255,80,80,.08); padding: 10px 14px; border-radius: 10px; grid-column: 1 / -1; }
.pay-methods { border: 1px solid var(--line); border-radius: 12px; padding: 14px; display: flex; gap: 12px; }
.pay-methods legend { padding: 0 8px; color: var(--muted); font-size: 13px; }
.pay-method { display: flex; align-items: center; gap: 8px; }
.pay-method input { width: auto; }

/* ── steps ──────────────────────────────────── */
.steps { counter-reset: s; list-style: none; padding: 0; display: grid; gap: 14px; max-width: 640px; }
.steps li { counter-increment: s; padding-left: 48px; position: relative; }
.steps li::before {
  content: counter(s); position: absolute; left: 0; top: 0;
  width: 32px; height: 32px; border-radius: 50%; background: var(--accent);
  display: grid; place-items: center; font-weight: 700;
}

/* ── feature boxes ──────────────────────────── */
.feature-box { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.feature-box h3 { margin-top: 0; }
.feature-box b { color: var(--accent-2); font-size: 18px; }

/* ── buy ────────────────────────────────────── */
.buy { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.buy__item { display: flex; align-items: center; gap: 14px; border: 1px solid var(--line); border-radius: 12px; padding: 12px; margin: 12px 0; }
.buy__item img { width: 72px; height: 52px; object-fit: cover; border-radius: 8px; }
.buy__item div { flex: 1; }
.buy__item h3 { margin: 0; font-size: 16px; }
.buy__total { display: flex; justify-content: space-between; font-size: 18px; padding-top: 10px; border-top: 1px solid var(--line); }

/* ── blog ───────────────────────────────────── */
.posts { display: grid; gap: 18px; }
.post-card { background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; }
.post-card h2, .post-card h3 { margin: 0 0 8px; }
.post-card__meta { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 12px; flex-wrap: wrap; }
.article { max-width: 760px; }
.article header h1 { font-size: 34px; margin-bottom: 8px; }
.article__content { font-size: 17px; }
.article__content h2 { margin-top: 32px; }
.article__content ul { padding-left: 22px; }
.article__content blockquote {
  border-left: 3px solid var(--accent); margin: 20px 0; padding: 6px 18px; color: var(--muted); background: var(--bg-2); border-radius: 0 10px 10px 0;
}
.article__cta { margin-top: 34px; }

/* ── cta block ──────────────────────────────── */
.cta {
  text-align: center; background: linear-gradient(135deg, var(--bg-2), var(--bg-3));
  border: 1px solid var(--line); border-radius: var(--radius); padding: 44px 24px;
}
.cta--sm { padding: 26px 24px; }

/* ── success / notice ───────────────────────── */
.success-icon {
  width: 72px; height: 72px; border-radius: 50%; margin: 0 auto 20px;
  background: rgba(110,231,183,.12); color: var(--accent-2);
  display: grid; place-items: center; font-size: 36px; font-weight: 700;
}
.notice { background: var(--bg-2); border: 1px dashed var(--line); border-radius: 12px; padding: 16px 20px; max-width: 560px; margin: 20px auto; color: var(--muted); }
.center__actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ── footer ─────────────────────────────────── */
.footer { border-top: 1px solid var(--line); margin-top: 60px; padding: 40px 0 24px; }
.footer__inner { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.footer__cols { display: flex; gap: 60px; flex-wrap: wrap; }
.footer__cols h4 { margin: 0 0 12px; font-size: 15px; }
.footer__cols a { display: block; color: var(--muted); padding: 3px 0; }
.footer__cols a:hover { color: var(--text); }
.footer__bottom { display: flex; justify-content: space-between; gap: 16px; margin-top: 30px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 14px; flex-wrap: wrap; }

/* ── responsive ─────────────────────────────── */
@media (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .product, .buy { grid-template-columns: 1fr; gap: 24px; }
}
@media (max-width: 640px) {
  .nav a:not(.btn) { display: none; }
  .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .form__row { grid-template-columns: 1fr; }
  .hero { padding-top: 44px; }
  .hero__stats { gap: 24px; }
}