/* ────────────── Root & Thema Variabelen ────────────── */
:root {
  --sell-color: #ff7b39;
  --rent-color: #2fb0a8;
  --bg: #bdbdbd;
  --surface: #ffffff;
  --surface-alt: #f0f7f7;
  --surface-invite: #fff7d8;
  --text: #222;
  --text-light: #555;
  --accent: #a5e0d2;
  --accent2: #ffd866;
  --accent3: #3f3f3fad;

  --radius: 10px;
  --shadow: 0 3px 6px rgba(0,0,0,0.15);
}

/* Dark Theme */
html.dark-theme {
  --bg: #222;
  --surface: #2b2b2b;
  --surface-alt: #333;
  --surface-invite: #3a3a3a;
  --text: #f5f5f5;
  --text-light: #ccc;
  --accent3: #d4d4d4;
}

html.dark-theme body { background: var(--bg); }

/* ────────────── Reset & Body ────────────── */
*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  padding: 2rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  font-family: "Poppins", sans-serif;
  color: var(--text);
  background: var(--bg);
}

/* ────────────── Main Container ────────────── */
main {
  width: 100%;
  max-width: 1680px;
  margin: 0 auto;
  padding: 0 1rem;
  display: grid;
  gap: 2rem;
  justify-items: center;
}

/* ────────────── Post-it Kaarten ────────────── */
.postit {
  background: var(--surface);
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
  transition: transform 0.2s ease;
}
.postit.alt { background: var(--surface-alt); }
.postit.invite {
  background: var(--surface-invite);
  text-align: center;
  grid-column: 1 / -1;
}
.postit:hover { transform: translateY(-6px); }

.postit h2 {
  font-size: 1.4rem;
  margin: 0;
  text-align: center;
}

/* ────────────── Responsief Grid ────────────── */
@media (max-width: 900px) {
  main { grid-template-columns: 1fr; }
  .postit { max-width: 560px; margin: 0 auto; }
}

@media (min-width: 901px) and (max-width: 1400px) {
  main { grid-template-columns: repeat(2, 1fr); }
  .postit { max-width: 520px; }
}

@media (min-width: 1401px) {
  main { grid-template-columns: repeat(3, 1fr); }
  .postit { max-width: 480px; }
}

.postit.invite {
  max-width: 1000px;
  margin: 0 auto;
}

@media (min-width: 1700px) {
  main { max-width: 1800px; }
  .postit.invite { max-width: 1200px; }
}