* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Helvetica Neue', Arial, sans-serif;
}

:root {
  --bg-dark: #121214;
  --bg-card: #1c1c1e;
  --text-main: #f5f5f7;
  --text-sub: #a1a1a6;
  --accent-warm: #ffb347;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 8%;
  background: rgba(18, 18, 20, 0.9);
  position: fixed;
  width: 100%;
  top: 0;
  border-bottom: 1px solid #2c2c2e;
}

.logo { font-size: 1.5rem; font-weight: bold; color: var(--accent-warm); }
.nav-links { display: flex; list-style: none; gap: 20px; }
.nav-links a { color: var(--text-sub); text-decoration: none; }

.hero {
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 120px 20px 40px;
  background: radial-gradient(circle at center, #2c2013 0%, var(--bg-dark) 70%);
}

.hero h1 { font-size: 2.5rem; margin: 15px 0; }
.btn-cta, .btn-demo {
  background-color: var(--accent-warm);
  color: #000;
  padding: 12px 30px;
  border-radius: 25px;
  font-weight: bold;
  text-decoration: none;
  border: none;
  cursor: pointer;
}

/* DEMO BOX (JS Animation AREA) */
.demo-section {
  text-align: center;
  padding: 60px 20px;
  background: #18181a;
  border-top: 1px solid #2c2c2e;
}

.lamp-box {
  width: 200px;
  height: 200px;
  margin: 30px auto;
  border-radius: 50%;
  background: #000;
  border: 2px solid #333;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transition: all 1s ease;
}

.lamp-light {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: #333;
  transition: background 2s ease, box-shadow 2s ease;
}

/* FEATURES & FAQ */
.features, .faq { padding: 60px 8%; max-width: 1000px; margin: 0 auto; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; margin-top: 30px; }
.card { background: var(--bg-card); padding: 25px; border-radius: 12px; }

footer { text-align: center; padding: 30px; color: var(--text-sub); font-size: 0.85rem; }