:root {
  --bg: #0a0f1c;
  --surface: #111827;
  --panel: rgba(17, 24, 39, .72);
  --ink: #f8fafc;
  --muted: #94a3b8;
  --line: rgba(148, 163, 184, .18);
  --accent: #38bdf8;
  --accent-dark: #0284c7;
  --accent-soft: rgba(56, 189, 248, .12);
  --glow: rgba(56, 189, 248, .28);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 0;
}

body {
  min-width: 0;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 14% 12%, rgba(56, 189, 248, .16), transparent 34rem),
    radial-gradient(circle at 84% 18%, rgba(99, 102, 241, .2), transparent 30rem),
    radial-gradient(circle at 50% 96%, rgba(14, 165, 233, .1), transparent 36rem),
    var(--bg);
  color: var(--ink);
  font-family: Arial, sans-serif;
  line-height: 1.5;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(10, 15, 28, .12), rgba(10, 15, 28, .86));
  content: "";
}

a {
  color: inherit;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(2.55rem, 7vw, 5.2rem);
  line-height: .95;
}

h2 {
  font-size: 1.6rem;
  line-height: 1.15;
}

button,
.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark) 58%, #4f46e5);
  box-shadow: 0 16px 34px rgba(2, 132, 199, .26);
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 11px 18px;
  text-decoration: none;
}

input {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(15, 23, 42, .86);
  color: var(--ink);
  font: inherit;
  padding: 11px 12px;
}

input::placeholder {
  color: rgba(148, 163, 184, .78);
}

main,
.site-nav {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

main {
  padding: 72px 0;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(10, 15, 28, .64);
  backdrop-filter: blur(18px);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.brand-mark {
  width: 30px;
  height: 30px;
  border: 1px solid rgba(125, 211, 252, .52);
  border-radius: 10px;
  background:
    linear-gradient(135deg, rgba(56, 189, 248, .95), rgba(79, 70, 229, .76)),
    var(--surface);
  box-shadow: 0 0 28px var(--glow);
}

.home-link {
  color: var(--muted);
  font-size: .95rem;
  text-decoration: none;
}

.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, .75fr);
  align-items: center;
  gap: 56px;
  min-height: calc(100vh - 180px);
}

.hero-copy {
  display: grid;
  gap: 22px;
}

.eyebrow {
  color: var(--accent);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero-subtitle {
  max-width: 620px;
  color: var(--muted);
  font-size: 1.28rem;
}

.private-card,
.panel {
  display: grid;
  gap: 24px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--panel);
  box-shadow: 0 28px 80px rgba(0, 0, 0, .34), inset 0 1px rgba(255, 255, 255, .05);
  backdrop-filter: blur(20px);
}

.private-card {
  padding: 34px;
}

.private-card .button {
  justify-self: start;
}

.panel {
  width: min(760px, 100%);
  margin: 0 auto;
  padding: 32px;
}

.auth-panel {
  width: min(520px, 100%);
}

.lock-indicator {
  display: inline-flex;
  width: max-content;
  align-items: center;
  gap: 9px;
  border: 1px solid rgba(56, 189, 248, .2);
  border-radius: 999px;
  background: var(--accent-soft);
  color: #bae6fd;
  font-size: .82rem;
  font-weight: 700;
  padding: 7px 11px;
}

.lock-dot {
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 16px var(--glow);
}

.page-title {
  font-size: clamp(2.1rem, 5vw, 3.7rem);
}

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

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.add-item,
.login-form {
  display: grid;
  gap: 14px;
}

.add-item label,
.login-form label {
  display: grid;
  gap: 7px;
  font-weight: 700;
}

.add-item div {
  display: flex;
  gap: 10px;
}

.error {
  color: #fca5a5;
  font-weight: 700;
}

.items {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.items li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  min-height: 54px;
  padding: 9px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(15, 23, 42, .68);
}

.items form {
  margin: 0;
}

.check {
  width: 42px;
  min-height: 38px;
  padding: 0;
  border: 1px solid rgba(148, 163, 184, .32);
  background: rgba(15, 23, 42, .8);
  box-shadow: none;
  color: var(--accent);
  font-size: 1.25rem;
}

.remove {
  width: 38px;
  min-height: 38px;
  padding: 0;
  background: rgba(71, 85, 105, .72);
  box-shadow: none;
  font-size: 1.15rem;
}

.is-bought span {
  color: #64748b;
  text-decoration: line-through;
}

.empty {
  grid-template-columns: 1fr;
  color: var(--muted);
}

@media (max-width: 760px) {
  main,
  .site-nav {
    width: min(100% - 28px, 1120px);
  }

  main {
    padding: 46px 0;
  }

  .home-hero {
    grid-template-columns: 1fr;
    gap: 34px;
    min-height: auto;
  }

  .hero-subtitle {
    font-size: 1.08rem;
  }

  .private-card,
  .panel {
    border-radius: 22px;
    padding: 24px;
  }

  .private-card .button {
    width: 100%;
  }
}

@media (max-width: 520px) {
  .home-link {
    display: none;
  }

  h1 {
    font-size: 2.55rem;
  }

  .add-item div {
    display: grid;
  }
}