:root {
  --green: #1f7a4d;
  --green-dark: #16603b;
  --blue: #2c6ecb;
  --bg: #f4f6f8;
  --card: #ffffff;
  --border: #e0e4e8;
  --text: #1a2733;
  --muted: #64748b;
  --danger: #c0392b;
  --radius: 8px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

#app { display: flex; min-height: 100vh; }

/* ---- Auth screen ---- */
.auth-wrap {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.auth-card {
  background: var(--card);
  padding: 40px;
  border-radius: var(--radius);
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
  width: 380px;
}
.auth-card .auth-logo {
  display: block;
  height: 64px;
  width: auto;
  margin: 0 auto 16px;
}
.auth-card h1 {
  font-size: 22px;
  margin: 0 0 4px;
  text-align: center;
  color: var(--green-dark);
}
.auth-card p.sub { color: var(--muted); margin: 0 0 24px; font-size: 14px; text-align: center; }
.auth-tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.auth-tabs button {
  flex: 1; padding: 8px; border: 1px solid var(--border); background: #fff;
  border-radius: 6px; cursor: pointer; font-size: 14px;
}
.auth-tabs button.active { background: var(--green); color: white; border-color: var(--green); }

/* ---- Layout ---- */
.sidebar {
  width: 220px;
  background: #14322a;
  color: #d7e6df;
  padding: 20px 0;
  flex-shrink: 0;
}
.sidebar .brand {
  display: flex; align-items: center; gap: 10px;
  font-size: 16px; font-weight: 700; color: white;
  padding: 0 20px 20px; border-bottom: 1px solid #24443a; margin-bottom: 10px;
}
.sidebar .brand img {
  height: 32px; width: 32px; object-fit: contain; flex-shrink: 0;
  background: #fff; border-radius: 6px; padding: 3px;
}
.sidebar nav a {
  display: block; padding: 10px 20px; color: #b9cfc5; text-decoration: none; font-size: 14px;
  cursor: pointer;
}
.sidebar nav a:hover { background: #1d4436; color: white; }
.sidebar nav a.active { background: var(--green); color: white; font-weight: 600; }
.sidebar .company-name { padding: 0 20px 10px; font-size: 13px; color: #8fae9f; }
.sidebar .logout { margin-top: 20px; }

.main { flex: 1; padding: 28px 36px; overflow-x: auto; }
.main h2 { margin-top: 0; }

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

/* ---- Cards / tables ---- */
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; margin-bottom: 20px;
}
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 24px; }
.stat { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.stat .label { color: var(--muted); font-size: 13px; }
.stat .value { font-size: 24px; font-weight: 700; margin-top: 4px; }
.stat .value.neg { color: var(--danger); }
.stat .value.pos { color: var(--green-dark); }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
table th { text-align: left; padding: 8px 10px; border-bottom: 2px solid var(--border); color: var(--muted); font-weight: 600; }
table td { padding: 8px 10px; border-bottom: 1px solid var(--border); }
table tr:hover td { background: #fafbfc; }
.num { text-align: right; font-variant-numeric: tabular-nums; }

.btn {
  display: inline-block; background: var(--green); color: white; border: none; padding: 8px 16px;
  border-radius: 6px; cursor: pointer; font-size: 14px; text-decoration: none;
}
.btn:hover { background: var(--green-dark); }
.btn.secondary { background: white; color: var(--text); border: 1px solid var(--border); }
.btn.secondary:hover { background: #f0f2f4; }
.btn.danger { background: var(--danger); }
.btn.small { padding: 4px 10px; font-size: 12px; }

.badge { padding: 2px 8px; border-radius: 12px; font-size: 12px; font-weight: 600; }
.badge.draft { background: #eee; color: #666; }
.badge.sent, .badge.open { background: #fff3cd; color: #a8760a; }
.badge.paid { background: #d7f0e0; color: var(--green-dark); }
.badge.partial { background: #dbe9fb; color: var(--blue); }
.badge.void { background: #f8d7da; color: var(--danger); }

input, select, textarea {
  padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px;
  width: 100%; font-family: inherit;
}
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 4px; margin-top: 12px; }
.form-row { display: flex; gap: 16px; }
.form-row > div { flex: 1; }

.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.4); display: flex;
  align-items: center; justify-content: center; z-index: 100;
}
.modal {
  background: white; border-radius: var(--radius); padding: 28px; width: 560px;
  max-height: 85vh; overflow-y: auto;
}
.modal h3 { margin-top: 0; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }

.line-item-table input { padding: 6px 8px; font-size: 13px; }
.line-item-row { display: grid; grid-template-columns: 3fr 1fr 1fr 1fr 1.5fr auto; gap: 6px; align-items: center; margin-bottom: 6px; }

.error-msg { color: var(--danger); font-size: 13px; margin-top: 8px; }
.success-msg { color: var(--green-dark); font-size: 13px; margin-top: 8px; }
.muted { color: var(--muted); }
.tabs { display: flex; gap: 4px; margin-bottom: 16px; border-bottom: 1px solid var(--border); }
.tabs button {
  background: none; border: none; padding: 10px 16px; cursor: pointer; font-size: 14px;
  border-bottom: 2px solid transparent; color: var(--muted);
}
.tabs button.active { color: var(--green-dark); border-bottom-color: var(--green); font-weight: 600; }

.empty-state { text-align: center; padding: 40px; color: var(--muted); }