* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #f8fafc; --card: #fff; --primary: #2563eb; --primary-hover: #1d4ed8;
  --danger: #dc2626; --text: #1e293b; --muted: #64748b; --border: #e2e8f0;
  --success: #16a34a; --radius: 10px;
}
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }

/* ── Header / Nav ── */
header { background: var(--primary); color: #fff; padding: 14px 24px; display: flex; justify-content: space-between; align-items: center; }
header h1 { font-size: 20px; font-weight: 700; }
nav { display: flex; gap: 4px; }
nav a { color: rgba(255,255,255,.75); text-decoration: none; padding: 6px 14px; border-radius: 6px; font-size: 14px; font-weight: 500; }
nav a:hover { background: rgba(255,255,255,.15); color: #fff; }
nav a.active { background: rgba(255,255,255,.2); color: #fff; }
nav .sign-out { margin-left: 12px; opacity: .6; }
nav .sign-out:hover { opacity: 1; }

/* ── Layout ── */
main { max-width: 640px; margin: 24px auto; padding: 0 16px; }

/* ── Cards ── */
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin-bottom: 20px; }
.card h2 { font-size: 17px; font-weight: 600; margin-bottom: 14px; }

/* Hero payroll card */
.hero-card { text-align: center; border-color: var(--primary); border-width: 2px; }
.hero-card h2 { font-size: 20px; border: none; }

/* Big number display */
.big-number { font-size: 42px; font-weight: 800; margin: 8px 0; }
.big-number .big-label { display: block; font-size: 14px; font-weight: 400; color: var(--muted); }

/* Success card */
.success-card { border-left: 5px solid var(--success); }
.success-card h2 { color: var(--success); }

/* Todo card */
.todo-card { background: #f0fdf4; border-color: #bbf7d0; }
.todo-card h2 { border: none; }
.todo-list { display: flex; flex-direction: column; gap: 16px; }
.todo-item { display: flex; gap: 16px; align-items: flex-start; }
.todo-num { width: 32px; height: 32px; border-radius: 50%; background: var(--success); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 15px; flex-shrink: 0; }
.todo-item strong { font-size: 16px; }
.todo-item p { color: var(--muted); font-size: 14px; margin-top: 2px; }

/* Deposit reminder */
.reminder { background: #fffbeb; border-color: #fde68a; text-align: center; }
.reminder.urgent { background: #fef2f2; border-color: #fecaca; }
.reminder h2 { color: #92400e; border: none; }
.reminder.urgent h2 { color: var(--danger); }
.reminder .big-number { font-size: 32px; margin: 4px 0; }

/* Result grid */
.result-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
.result-grid .full-width { grid-column: 1 / -1; text-align: center; padding-top: 8px; border-top: 1px solid var(--border); }
.result-grid .label { display: block; font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; }
.result-grid .val { display: block; font-size: 20px; font-weight: 700; margin-top: 2px; }
.result-grid .val.big { font-size: 28px; }
.green { color: var(--success); }

/* ── Forms ── */
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; font-weight: 600; color: var(--muted); margin-bottom: 4px; text-transform: uppercase; letter-spacing: .3px; }
.field input, .field select { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 15px; color: var(--text); }
.field input:focus, .field select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.1); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* Big button */
.btn-big { display: block; width: 100%; padding: 14px; background: var(--primary); color: #fff; border: none; border-radius: 8px; font-size: 17px; font-weight: 600; cursor: pointer; }
.btn-big:hover { background: var(--primary-hover); }
.btn-big:disabled { opacity: .5; cursor: not-allowed; }

/* ── Tables ── */
table { width: 100%; border-collapse: collapse; }
th, td { padding: 8px 10px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
th { font-size: 11px; text-transform: uppercase; color: var(--muted); font-weight: 600; }

/* Form reference table */
.form-table td:last-child { text-align: right; font-weight: 600; font-family: 'SF Mono','Fira Code',monospace; }
.form-table tr.total td { font-weight: 700; font-size: 15px; border-top: 2px solid var(--text); }

.how-to { margin-top: 16px; padding: 12px 16px; background: #eff6ff; border-radius: 8px; font-size: 14px; }

.quarter-header td { background: var(--bg); font-weight: 600; font-size: 13px; color: var(--muted); }

/* ── Alerts ── */
.msg { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; font-size: 14px; }
.msg-err { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.msg-ok { background: #f0fdf4; color: var(--success); border: 1px solid #bbf7d0; }

.subtle { font-size: 13px; color: var(--muted); }

/* ── Login / Setup ── */
.login-wrapper { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--bg); }
.login-card, .setup-card { background: var(--card); padding: 36px; border-radius: 14px; border: 1px solid var(--border); width: 100%; box-shadow: 0 4px 6px -1px rgba(0,0,0,.07); }
.login-card { max-width: 380px; }
.setup-card { max-width: 460px; }
.login-card h1, .setup-card h1 { text-align: center; margin-bottom: 6px; font-size: 22px; }
.login-card p, .setup-card p { text-align: center; color: var(--muted); margin-bottom: 20px; }

details summary { font-size: 14px; font-weight: 500; }

/* ── Responsive ── */
@media (max-width: 600px) {
  .field-row { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr 1fr; }
  header { flex-direction: column; gap: 8px; }
  nav { flex-wrap: wrap; justify-content: center; }
  .big-number { font-size: 32px; }
}