:root {
  --ink: #111318;
  --muted: #667085;
  --line: #e7e9ee;
  --soft: #f5f6f8;
  --panel: #ffffff;
  --dark: #0b0f19;
  --accent: #1d1d1f;
  --good: #0f8a4b;
  --warn: #a15c00;
  --danger: #b42318;
  --shadow: 0 20px 55px rgba(15, 23, 42, 0.09);
  --radius: 28px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: #fbfbfd;
}

a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 251, 253, 0.88);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(231, 233, 238, 0.8);
}
.nav {
  max-width: 1180px;
  margin: 0 auto;
  padding: 16px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.04em;
  font-size: 1.1rem;
}
.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  color: #fff;
  background: linear-gradient(135deg, #111318, #363b49);
  box-shadow: 0 10px 24px rgba(17,19,24,.18);
}
.nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 20px;
  font-size: .94rem;
  color: #31343b;
}
.nav-links a { opacity: .78; }
.nav-links a:hover, .nav-links .active { opacity: 1; }
.nav-actions { display: flex; gap: 10px; align-items: center; }
.icon-link {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 14px;
  background: #fff;
  box-shadow: 0 3px 12px rgba(15,23,42,.04);
}
.mobile-toggle { display: none; border: 0; background: transparent; font-size: 1.6rem; }

.container { max-width: 1180px; margin: 0 auto; padding: 0 22px; }
.hero {
  padding: 78px 0 56px;
  background:
    radial-gradient(circle at 15% 10%, rgba(90, 111, 255, .11), transparent 35%),
    radial-gradient(circle at 85% 0%, rgba(0, 0, 0, .09), transparent 28%);
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 28px; align-items: stretch; }
.kicker {
  display: inline-flex;
  gap: 9px;
  align-items: center;
  padding: 8px 12px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: .9rem;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.04);
}
.hero h1, .page-title h1 {
  font-size: clamp(2.55rem, 7vw, 5.6rem);
  line-height: .95;
  letter-spacing: -.075em;
  margin: 18px 0;
}
.hero p, .page-title p {
  font-size: 1.15rem;
  color: var(--muted);
  line-height: 1.7;
  max-width: 680px;
}
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.btn {
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 13px 20px;
  background: var(--accent);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  font-weight: 650;
  transition: .2s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 16px 32px rgba(17,19,24,.16); }
.btn.secondary { background: #fff; color: var(--ink); border-color: var(--line); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.full { width: 100%; }
.hero-card {
  min-height: 470px;
  background: linear-gradient(155deg, #111318, #232834 55%, #eef0f5 55.2%, #fff);
  border-radius: 42px;
  color: #fff;
  padding: 34px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  position: relative;
}
.hero-card::after {
  content: '';
  position: absolute;
  right: -70px;
  bottom: -80px;
  width: 260px;
  height: 260px;
  border: 1px solid rgba(255,255,255,.32);
  border-radius: 999px;
}
.hero-device {
  width: min(320px, 80%);
  aspect-ratio: 9/16;
  align-self: center;
  border-radius: 42px;
  border: 12px solid #06080d;
  background:
    radial-gradient(circle at 30% 25%, rgba(255,255,255,.26), transparent 25%),
    linear-gradient(150deg, #4d5bff, #090b11 62%);
  box-shadow: 0 35px 80px rgba(0,0,0,.38);
  display: grid;
  place-items: center;
  text-align: center;
  padding: 26px;
  letter-spacing: -.04em;
}
.hero-device strong { font-size: clamp(2rem, 4vw, 3.2rem); line-height: .95; }
.hero-mini { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; color: var(--ink); }
.hero-mini span {
  background: rgba(255,255,255,.88);
  border: 1px solid rgba(255,255,255,.65);
  border-radius: 18px;
  padding: 14px;
  font-size: .82rem;
  color: #3f4450;
}
.section { padding: 64px 0; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 22px; margin-bottom: 24px; }
.section-head h2 { font-size: clamp(2rem, 4vw, 3.4rem); line-height: 1; letter-spacing: -.06em; margin: 0; }
.section-head p { color: var(--muted); max-width: 560px; line-height: 1.6; margin: 8px 0 0; }
.grid { display: grid; gap: 18px; }
.grid.products { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 14px 36px rgba(15,23,42,.055);
  padding: 24px;
}
.product-card {
  min-height: 335px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: .22s ease;
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.text-product-box {
  min-height: 160px;
  border-radius: 24px;
  background:
    radial-gradient(circle at top left, rgba(255,255,255,.9), transparent 35%),
    linear-gradient(135deg, #f7f8fb, #e5e8ef);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 22px;
  border: 1px solid #eef0f5;
  margin-bottom: 18px;
}
.text-product-box.dark {
  background: linear-gradient(135deg, #111318, #3a404c);
  color: #fff;
  border-color: #2e3440;
}
.product-name-large { font-size: 2rem; line-height: .98; letter-spacing: -.065em; font-weight: 850; }
.badge {
  align-self: flex-start;
  display: inline-flex;
  border-radius: 999px;
  background: #f1f3f7;
  border: 1px solid #e6e9ef;
  padding: 7px 10px;
  color: #4b5563;
  font-size: .8rem;
  font-weight: 700;
}
.product-card h3 { margin: 0 0 8px; font-size: 1.4rem; letter-spacing: -.035em; }
.meta { color: var(--muted); line-height: 1.55; font-size: .95rem; }
.price { font-weight: 850; font-size: 1.35rem; margin: 16px 0; letter-spacing: -.03em; }
.product-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.product-actions .btn { padding: 11px 15px; font-size: .92rem; }
.feature { min-height: 230px; }
.feature h3 { font-size: 1.35rem; letter-spacing: -.03em; margin: 0 0 10px; }
.feature p { color: var(--muted); line-height: 1.65; margin: 0; }
.feature-icon { font-size: 2rem; margin-bottom: 18px; }
.page-hero { padding: 54px 0 26px; }
.page-title h1 { max-width: 860px; }
.filters {
  display: grid;
  grid-template-columns: 1fr 220px 180px;
  gap: 12px;
  margin: 22px 0 28px;
}
.input, .select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 18px;
  padding: 14px 16px;
  color: var(--ink);
  outline: none;
}
.input:focus, .select:focus, textarea:focus { border-color: #b5bccb; box-shadow: 0 0 0 4px rgba(17, 19, 24, .04); }
.product-detail { display: grid; grid-template-columns: .9fr 1.1fr; gap: 28px; align-items: start; }
.product-stage {
  min-height: 560px;
  border-radius: 42px;
  padding: 34px;
  background: linear-gradient(140deg, #111318, #2e3440);
  color: #fff;
  display: grid;
  place-items: center;
  text-align: center;
  box-shadow: var(--shadow);
}
.product-stage strong { display: block; font-size: clamp(3rem, 7vw, 6rem); line-height: .86; letter-spacing: -.08em; }
.spec-list { display: grid; gap: 10px; margin: 22px 0; }
.spec-list li { list-style: none; padding: 14px 16px; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.cart-layout { display: grid; grid-template-columns: 1fr 360px; gap: 24px; align-items: start; }
.cart-item { display: grid; grid-template-columns: 1fr auto; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.qty { display: flex; gap: 8px; align-items: center; }
.qty button { width: 32px; height: 32px; border-radius: 999px; border: 1px solid var(--line); background: #fff; cursor: pointer; }
.summary-row { display: flex; justify-content: space-between; margin: 14px 0; color: #384050; }
.summary-row.total { color: var(--ink); font-weight: 850; font-size: 1.25rem; border-top: 1px solid var(--line); padding-top: 16px; margin-top: 18px; }
.checkout-grid, .login-grid { display: grid; grid-template-columns: 1fr 420px; gap: 24px; align-items: start; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-grid .wide { grid-column: 1 / -1; }
.login-panel { position: sticky; top: 92px; }
.note { background: #f6f7fa; border: 1px solid var(--line); border-radius: 20px; padding: 16px; color: var(--muted); line-height: 1.55; }
.dashboard-shell { display: grid; grid-template-columns: 260px 1fr; min-height: calc(100vh - 68px); }
.sidebar { background: #0b0f19; color: #fff; padding: 24px; }
.sidebar .brand { margin-bottom: 28px; }
.side-nav { display: grid; gap: 8px; }
.side-nav a { color: rgba(255,255,255,.74); padding: 12px 14px; border-radius: 14px; }
.side-nav a.active, .side-nav a:hover { color: #fff; background: rgba(255,255,255,.09); }
.dashboard-main { padding: 30px; background: #f6f7fa; }
.stat-grid { grid-template-columns: repeat(4, 1fr); }
.stat .label { color: var(--muted); font-size: .9rem; }
.stat .value { font-size: 2rem; font-weight: 850; letter-spacing: -.05em; margin-top: 8px; }
.chart-bars { display: grid; gap: 14px; margin-top: 18px; }
.bar-row { display: grid; grid-template-columns: 145px 1fr 42px; gap: 10px; align-items: center; color: #4b5563; }
.bar { height: 12px; background: #e6e9ef; border-radius: 999px; overflow: hidden; }
.bar span { display: block; height: 100%; background: #111318; border-radius: inherit; }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { text-align: left; border-bottom: 1px solid var(--line); padding: 14px 8px; }
.table th { color: var(--muted); font-weight: 650; font-size: .88rem; }
.status { border-radius: 999px; padding: 6px 10px; font-size: .8rem; font-weight: 750; background: #eef6f1; color: var(--good); }
.footer { border-top: 1px solid var(--line); padding: 34px 0; color: var(--muted); }
.footer-grid { display: grid; grid-template-columns: 1fr repeat(3, auto); gap: 24px; align-items: center; }
.empty-state { text-align: center; padding: 56px 24px; color: var(--muted); }
.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  background: #111318;
  color: #fff;
  padding: 13px 18px;
  border-radius: 999px;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(14px);
  transition: .22s ease;
  z-index: 100;
}
.toast.show { opacity: 1; transform: translateY(0); }

@media (max-width: 960px) {
  .hero-grid, .product-detail, .cart-layout, .checkout-grid, .login-grid, .dashboard-shell { grid-template-columns: 1fr; }
  .grid.products { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid.four, .stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .filters { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .login-panel { position: static; }
}
@media (max-width: 760px) {
  .nav { align-items: flex-start; }
  .mobile-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 67px;
    left: 14px;
    right: 14px;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: #fff;
    flex-direction: column;
    align-items: flex-start;
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .nav-actions { margin-left: auto; }
  .grid.products, .grid.four, .stat-grid, .form-grid { grid-template-columns: 1fr; }
  .hero { padding-top: 48px; }
  .hero-card { min-height: 410px; border-radius: 32px; }
  .hero-mini { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}