:root {
  --bg: #faf8f6;
  --surface: #ffffff;
  --text: #2c1810;
  --muted: #6b5c50;
  --primary: #c5942a;
  --primary-dark: #2c1810;
  --primary-soft: #3d2e22;
  --accent: #f8f2ea;
  --border: #e8ddd2;
  --danger: #b42318;
  --warning: #b54708;
  --shadow: 0 8px 24px rgba(44, 24, 16, 0.08);
  --radius: 14px;
  --nav-width: 240px;
  --font: "Lato", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: var(--nav-width) 1fr;
  grid-template-rows: auto 1fr auto;
  grid-template-areas:
    "header header"
    "nav main"
    "nav footer";
}

.app-header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.25rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
}
.brand-icon { font-size: 1.6rem; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text small { color: var(--muted); font-size: 0.8rem; }

.nav-toggle {
  display: none;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 10px;
  padding: 0.45rem 0.7rem;
  font-size: 1.1rem;
}

.app-nav {
  grid-area: nav;
  background: linear-gradient(180deg, #2c1810 0%, #3d2e22 100%);
  color: #fff;
  padding: 1rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-height: calc(100vh - 60px);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.75rem 0.9rem;
  border-radius: 10px;
  color: rgba(255,255,255,0.9);
  text-decoration: none;
  font-weight: 500;
}
.nav-link:hover { background: rgba(255,255,255,0.08); text-decoration: none; }
.nav-link.is-active { background: rgba(255,255,255,0.16); }
.nav-logout { margin-top: auto; opacity: 0.85; }

.app-main {
  grid-area: main;
  padding: 1.25rem;
  max-width: 1100px;
  width: 100%;
}

.app-footer {
  grid-area: footer;
  padding: 1rem 1.25rem 1.25rem  calc(var(--nav-width) + 1.25rem);
  color: var(--muted);
}

.page-head {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.page-head h1 { margin: 0 0 0.2rem; font-size: 1.6rem; }
.muted { color: var(--muted); margin: 0; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1.1rem;
  margin-bottom: 1rem;
}
.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}
.card-head h2 { margin: 0; font-size: 1.05rem; }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.85rem;
  margin-bottom: 1rem;
}
.stat-grid.compact { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  box-shadow: var(--shadow);
}
.stat-card.highlight { border-color: #e0c88a; background: linear-gradient(180deg, #fffaf0, #fff); }
.stat-label { display: block; color: var(--muted); font-size: 0.82rem; }
.stat-value { display: block; font-size: 1.45rem; margin-top: 0.2rem; }
.stat-card small { color: var(--muted); font-size: 0.78rem; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  border-radius: 10px;
  border: 1px solid transparent;
  padding: 0.62rem 1rem;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  text-decoration: none;
  background: transparent;
  color: var(--text);
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: #a97d22; color: #fff; }
.btn-secondary { background: var(--accent); border-color: var(--border); color: var(--primary-dark); }
.btn-link { padding: 0.35rem 0.5rem; color: var(--primary); }
.btn-small { padding: 0.35rem 0.65rem; font-size: 0.85rem; border: 1px solid var(--border); border-radius: 8px; }
.btn-block { width: 100%; }
.btn-whatsapp { background: #25d366; color: #fff; border-color: #25d366; }
.btn-whatsapp:hover { background: #1da851; color: #fff; }

.action-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
}
.action-tile {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.9rem;
  color: inherit;
  background: #fbfcfb;
  text-decoration: none;
}
.action-tile span { font-size: 1.4rem; display: block; margin-bottom: 0.35rem; }
.action-tile strong { display: block; }
.action-tile small { color: var(--muted); }

.action-row { display: flex; flex-wrap: wrap; gap: 0.65rem; align-items: center; }
.action-row.wrap form { display: inline; }

.period-picker, .inline-form, .date-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

select, input[type="text"], input[type="tel"], input[type="number"], input[type="password"], input[type="date"], textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.62rem 0.75rem;
  font: inherit;
  background: #fff;
}
.date-nav input[type="date"] { width: auto; }

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}
.form-grid label span { display: block; font-size: 0.86rem; color: var(--muted); margin-bottom: 0.3rem; }
.span-2 { grid-column: span 2; }
.form-actions { display: flex; gap: 0.5rem; margin-top: 0.5rem; }
.checkbox { display: flex; align-items: center; gap: 0.5rem; }
.checkbox input { width: auto; }

.table-wrap { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.data-table th, .data-table td { padding: 0.65rem 0.5rem; border-bottom: 1px solid var(--border); text-align: left; }
.data-table th { color: var(--muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.03em; }
.data-table.compact th, .data-table.compact td { padding: 0.45rem 0.35rem; }
.empty, .empty-state { color: var(--muted); text-align: center; padding: 1rem; }
.is-inactive { opacity: 0.55; }

.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}
.badge-draft { background: #eef2f6; color: #475467; }
.badge-sent, .badge-sent { background: #e8f5ec; color: #14532d; }
.badge-paid { background: #dbeafe; color: #1d4ed8; }
.badge-error { background: #fee4e2; color: var(--danger); }

.flash {
  padding: 0.75rem 0.9rem;
  border-radius: 10px;
  margin-bottom: 1rem;
  border: 1px solid var(--border);
}
.flash-success { background: #ecfdf3; border-color: #abefc6; color: #067647; }
.flash-error { background: #fef3f2; border-color: #fecdca; color: var(--danger); }
.flash-warning { background: #fffaeb; border-color: #fedf89; color: var(--warning); }
.flash-info { background: #eff8ff; border-color: #b2ddff; color: #175cd3; }

.consumption-list { display: grid; gap: 0.75rem; margin-bottom: 5rem; }
.consumption-row {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem;
  box-shadow: var(--shadow);
}
.consumption-row.is-saved { border-left: 4px solid var(--primary); }
.consumption-info { margin-bottom: 0.65rem; }
.consumption-info small { color: var(--muted); }

.litre-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.litre-btn input { position: absolute; opacity: 0; pointer-events: none; }
.litre-btn span {
  display: inline-flex;
  min-width: 3.2rem;
  justify-content: center;
  padding: 0.5rem 0.65rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 0.85rem;
  cursor: pointer;
  user-select: none;
}
.litre-btn input:checked + span {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  font-weight: 700;
}

.sticky-save {
  position: fixed;
  left: var(--nav-width);
  right: 0;
  bottom: 0;
  padding: 0.85rem 1.25rem;
  background: rgba(244,247,244,0.95);
  border-top: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.invoice-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 0;
  margin-bottom: 1rem;
  overflow: hidden;
}
.invoice-brand {
  display: flex;
  gap: 1rem;
  align-items: center;
  padding: 1.1rem 1.2rem;
  background: linear-gradient(135deg, #2c1810 0%, #3d2e22 100%);
  color: #fff;
}
.invoice-brand-logo {
  width: 72px;
  height: 72px;
  object-fit: contain;
  border-radius: 12px;
  background: rgba(255,255,255,0.95);
  padding: 6px;
  flex-shrink: 0;
}
.invoice-brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 0;
}
.invoice-brand-name {
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: 0.01em;
}
.invoice-brand-tagline {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.92);
}
.invoice-brand-address,
.invoice-brand-link {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.75);
}
.invoice-brand-link { color: #f0d48a; text-decoration: none; }
.invoice-brand-link:hover { text-decoration: underline; }
.invoice-body { padding: 1.1rem; }
.invoice-head, .invoice-summary {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.invoice-meta { text-align: right; }
.invoice-summary {
  margin: 1rem 0;
  padding: 0.85rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.invoice-summary > div { min-width: 120px; }
.invoice-summary span { display: block; color: var(--muted); font-size: 0.82rem; }
.invoice-summary .total strong { font-size: 1.35rem; color: var(--primary); }
.invoice-details summary { cursor: pointer; font-weight: 600; margin: 0.5rem 0; }
.invoice-announcement {
  margin: 0.85rem 0;
  padding: 0.75rem 0.9rem;
  border-radius: 10px;
  background: #fff8eb;
  border: 1px solid #e8cfa0;
}
.invoice-announcement p { margin: 0.35rem 0 0; }
.payment-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.1rem;
  margin: 1rem 0;
  text-align: center;
}
.payment-block h3 { margin: 0 0 0.5rem; color: var(--primary-soft); }
.payment-payee { margin: 0 0 0.75rem; }
.payment-qr-wrap { display: flex; justify-content: center; margin: 0.5rem 0 0.75rem; }
.payment-qr { max-width: 220px; width: 100%; height: auto; border-radius: 10px; }
.payment-upi-id, .payment-amount { margin: 0.35rem 0; }
.payment-upi-btn { margin-top: 0.75rem; }
.invoice-footer, .hint { color: var(--muted); font-size: 0.9rem; }
.error-text { color: var(--danger); }

.message-preview, .code-block {
  background: #2c1810;
  color: #f8f2ea;
  border-radius: 10px;
  padding: 0.9rem;
  overflow-x: auto;
  white-space: pre-wrap;
  font-size: 0.88rem;
}

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: linear-gradient(180deg, #f8f2ea 0%, #faf8f6 40%, #fff 100%);
}
.login-card {
  width: min(420px, 100%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 1.25rem;
}
.login-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.login-brand img {
  width: 64px;
  height: 64px;
  object-fit: contain;
}
.login-brand-text { display: flex; flex-direction: column; gap: 0.15rem; }
.login-brand-text small { color: var(--muted); }
.login-form label { display: block; margin-bottom: 0.85rem; }
.login-form label span { display: block; margin-bottom: 0.3rem; color: var(--muted); font-size: 0.86rem; }

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "main"
      "footer";
  }
  .nav-toggle { display: inline-flex; }
  .app-nav {
    display: none;
    position: fixed;
    top: 58px;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 30;
    min-height: auto;
    overflow-y: auto;
  }
  .app-nav.is-open { display: flex; }
  .app-footer { padding-left: 1.25rem; }
  .sticky-save { left: 0; }
  .stat-grid, .action-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .form-grid { grid-template-columns: 1fr; }
  .span-2 { grid-column: span 1; }
}

.brand-logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
  border-radius: 8px;
  background: #fff;
  padding: 3px;
}
.public-shell { max-width: 520px; margin: 0 auto; padding: 1rem 1rem 2rem; }
.public-brand-band {
  text-align: center;
  padding: 1.25rem 1rem 1rem;
  background: linear-gradient(135deg, #2c1810 0%, #3d2e22 100%);
  color: #fff;
  border-radius: var(--radius) var(--radius) 0 0;
  margin-bottom: 0;
}
.public-brand-band img {
  width: 80px;
  height: 80px;
  object-fit: contain;
  background: #fff;
  border-radius: 14px;
  padding: 8px;
  margin-bottom: 0.65rem;
}
.public-brand-band strong { display: block; font-size: 1.2rem; font-weight: 900; }
.public-brand-band small { color: rgba(255,255,255,0.82); }
.public-invoice-card { border-radius: 0 0 var(--radius) var(--radius); margin-top: 0; }
.public-note { text-align: center; color: var(--muted); font-size: 0.88rem; margin: 0.75rem 0 0; }

@media (max-width: 520px) {
  .stat-grid, .stat-grid.compact, .action-grid { grid-template-columns: 1fr; }
  .page-head { flex-direction: column; }
}