:root {
  --navy: #072a4d;
  --blue: #006bb5;
  --accent: #a2224b;
  --bg: #f5f6f8;
  --border: #dde1e6;
}

* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, sans-serif; background: var(--bg); color: #1a1a1a; }

.topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--navy);
  color: #fff;
  padding: 0.75rem 1.5rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.topnav .brand { font-weight: 700; display: flex; align-items: center; gap: 0.5rem; }
.topnav .brand img { height: 28px; width: auto; }
.topnav .links a { color: #fff; margin-right: 1rem; text-decoration: none; font-size: 0.9rem; }
.topnav .links a:hover { text-decoration: underline; }
.topnav .user { display: flex; align-items: center; gap: 0.75rem; font-size: 0.85rem; }
.topnav button { background: transparent; border: 1px solid #fff; color: #fff; padding: 0.25rem 0.6rem; border-radius: 4px; cursor: pointer; }
.topnav .links a.active, form button.primary, button[type="submit"].primary { background: var(--blue); }

.page { max-width: 900px; margin: 0 auto; padding: 1.5rem; }

.auth-box { max-width: 320px; margin: 4rem auto; padding: 2rem; background: #fff; border-radius: 8px; box-shadow: 0 1px 4px rgba(0,0,0,0.1); }
.auth-box h1 { font-size: 1.1rem; text-align: center; }

form label { display: block; margin-bottom: 0.6rem; font-size: 0.9rem; }
form input, form select, form textarea { width: 100%; padding: 0.4rem; margin-top: 0.2rem; border: 1px solid var(--border); border-radius: 4px; }
form button { background: var(--navy); color: #fff; border: none; padding: 0.5rem 1rem; border-radius: 4px; cursor: pointer; margin-top: 0.4rem; }

table { width: 100%; border-collapse: collapse; margin-top: 1rem; background: #fff; }
table th, table td { text-align: left; padding: 0.5rem; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
tr.overdue { background: #fde8e8; }

.cards { display: flex; gap: 1rem; flex-wrap: wrap; margin: 1rem 0; }
.card { background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 1rem; min-width: 180px; }

.error { color: #b00020; }
.tag { font-size: 0.75rem; color: #666; }
.messages { background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 1rem; margin-bottom: 1rem; }

details { margin: 1rem 0; background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 0.75rem 1rem; }

.rsvp-form, .inline-form { display: flex; gap: 0.4rem; margin: 0; }
.rsvp-form select, .inline-form select { width: auto; margin: 0; }
.rsvp-form button, .inline-form button { margin: 0; padding: 0.3rem 0.6rem; font-size: 0.8rem; }

.product-buy { margin-top: 0.5rem; }
.product-buy button { background: var(--blue); }

.msg { padding: 0.5rem 0; border-bottom: 1px solid var(--border); }
.msg:last-child { border-bottom: none; }
.msg-reactions { display: flex; align-items: center; gap: 0.3rem; flex-wrap: wrap; margin-top: 0.2rem; }
.react-form { display: inline; margin: 0; }
.react-btn { background: #fff; border: 1px solid var(--border); color: #1a1a1a; border-radius: 12px; padding: 0.1rem 0.5rem; font-size: 0.85rem; margin: 0; cursor: pointer; }
.react-btn.mine { background: #e6f0fa; border-color: var(--blue); }
.reply-toggle { background: none; border: none; color: var(--blue); font-size: 0.8rem; cursor: pointer; padding: 0.1rem 0.4rem; }
.reply-form { display: flex; gap: 0.4rem; margin: 0.4rem 0 0.4rem 1.5rem; }
.reply-form input { width: auto; flex: 1; margin: 0; }
.reply-form button { margin: 0; padding: 0.3rem 0.6rem; font-size: 0.8rem; }
.replies { margin-left: 1.5rem; border-left: 2px solid var(--border); padding-left: 0.75rem; margin-top: 0.4rem; }
.hidden { display: none; }