* { box-sizing: border-box; }

:root {
  --bg: #0b0d12;
  --panel: #12151c;
  --panel-hover: #181c25;
  --text: #f4f6fb;
  --muted: #9299a8;
  --border: rgba(255,255,255,.09);
  --accent: #8b9cff;
  --shadow: 0 18px 50px rgba(0,0,0,.25);
}

:root.light {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --panel-hover: #f0f3f9;
  --text: #171a22;
  --muted: #697181;
  --border: rgba(20,25,40,.10);
  --accent: #5668e8;
  --shadow: 0 18px 50px rgba(30,40,70,.10);
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 0%, rgba(108,125,255,.13), transparent 35rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  transition: background .2s ease, color .2s ease;
}

.container { width: min(100% - 32px, 980px); margin: auto; padding: 42px 0 28px; }

.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 42px;
}

.brand { display: flex; align-items: center; gap: 16px; }

.logo {
  width: 52px; height: 52px; border-radius: 15px;
  display: grid; place-items: center;
  background: var(--accent); color: white;
  font-size: 25px; font-weight: 800;
  box-shadow: 0 10px 30px rgba(86,104,232,.28);
}

h1 { margin: 0; font-size: clamp(1.35rem, 3vw, 1.8rem); letter-spacing: .08em; }
.hero p { margin: 4px 0 0; color: var(--muted); }

.theme-toggle {
  border: 1px solid var(--border); background: var(--panel); color: var(--text);
  width: 42px; height: 42px; border-radius: 12px; cursor: pointer;
  font-size: 19px;
}

.intro { color: var(--muted); margin-bottom: 34px; }
section { margin: 0 0 30px; }
h2 { font-size: .78rem; text-transform: uppercase; letter-spacing: .14em; color: var(--muted); margin: 0 0 12px; }
.section-note { margin: -4px 0 12px; color: var(--muted); font-size: .8rem; }

.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }

.card {
  min-height: 82px;
  display: grid; grid-template-columns: 44px 1fr auto; align-items: center; gap: 13px;
  padding: 16px;
  text-decoration: none; color: var(--text);
  background: var(--panel); border: 1px solid var(--border); border-radius: 16px;
  box-shadow: var(--shadow);
  transition: transform .16s ease, background .16s ease, border-color .16s ease;
}

.card:hover { transform: translateY(-2px); background: var(--panel-hover); border-color: rgba(139,156,255,.35); }
.icon { font-size: 25px; text-align: center; }
.card strong { display: block; font-size: 1rem; }
.card small { display: block; margin-top: 3px; color: var(--muted); font-size: .82rem; }
.card em {
  display: inline-block; margin-top: 6px; padding: 2px 7px; border-radius: 20px;
  background: rgba(139,156,255,.12); color: var(--accent);
  font-size: .68rem; font-style: normal;
}
.arrow { color: var(--muted); font-size: 1.2rem; }

footer {
  display: flex; justify-content: space-between; gap: 12px;
  margin-top: 44px; padding-top: 20px; border-top: 1px solid var(--border);
  color: var(--muted); font-size: .76rem;
}

@media (max-width: 650px) {
  .container { padding-top: 26px; }
  .grid { grid-template-columns: 1fr; }
  .hero { margin-bottom: 30px; }
  footer { flex-direction: column; }
}