/* ── Variables ── */
:root {
  --bg: #f5f5f5;
  --surface: #ffffff;
  --border: #e4e4e7;
  --text: #18181b;
  --text-muted: #71717a;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --danger: #dc2626;
  --success: #16a34a;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
}

/* ── Dark mode ── */
html.dark {
  --bg: #09090b;
  --surface: #18181b;
  --border: #27272a;
  --text: #fafafa;
  --text-muted: #a1a1aa;
  --shadow: 0 1px 3px rgba(0,0,0,.4), 0 1px 2px rgba(0,0,0,.3);
}

html.dark .badge-paid  { background: #14532d; color: #4ade80; }
html.dark .badge-unpaid { background: #7f1d1d; color: #f87171; }
html.dark .flash { background: #422006; border-color: #92400e; color: #fde68a; }
html.dark .filter-tab.active { background: var(--text); color: #09090b; border-color: var(--text); }

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container.page { flex: 1; }

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

/* ── Layout ── */
.container {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* ── Nav ── */
nav.topnav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

nav.topnav .container {
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 52px;
}

.nav-links { margin-left: auto; }

.nav-brand {
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 0.375rem;
  text-decoration: none;
}

.nav-brand:hover { text-decoration: none; opacity: .85; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-links a {
  font-size: .875rem;
  color: var(--text-muted);
  font-weight: 500;
}

.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a.nav-active { color: var(--text); font-weight: 600; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-link {
  background: none;
  border: none;
  cursor: pointer;
  font-size: .875rem;
  color: var(--text-muted);
  font-weight: 500;
  font-family: inherit;
  padding: 0;
}

.btn-link:hover { color: var(--danger); }

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: .25rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  line-height: 0;
  transition: color .15s;
}

.theme-toggle:hover { color: var(--text); }

/* show sun in dark mode, moon in light mode */
html:not(.dark) .icon-sun { display: none; }
html.dark .icon-moon { display: none; }

.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .45);
  z-index: 8;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
}

.nav-overlay.nav-open {
  opacity: 1;
  pointer-events: auto;
}

.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: .25rem;
  color: var(--text-muted);
  align-items: center;
  line-height: 0;
  transition: color .15s;
}

.hamburger:hover { color: var(--text); }
.hamburger .icon-close { display: none; }
nav.nav-open .hamburger .icon-menu { display: none; }
nav.nav-open .hamburger .icon-close { display: block; }

/* ── Page ── */
.page {
  padding: 1.5rem 1rem 3rem;
}

.page-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

/* ── Card ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.card-title {
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-muted);
  margin-bottom: .875rem;
}

/* ── Detail rows ── */
.detail-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: .375rem 0;
  border-bottom: 1px solid var(--border);
  font-size: .9rem;
}

.detail-row:last-child { border-bottom: none; }
.detail-label { color: var(--text-muted); }
.detail-value { font-weight: 500; text-align: right; }
.detail-value.highlight { color: var(--accent); font-size: 1.05rem; }

/* ── Flash messages ── */
.flash {
  background: #fef9c3;
  border: 1px solid #fde047;
  border-radius: var(--radius);
  padding: .625rem .875rem;
  font-size: .875rem;
  margin-bottom: .75rem;
}

/* ── Forms ── */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: .8125rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: .3rem;
}

.form-group input,
.form-group select {
  display: block;
  width: 100%;
  padding: .625rem .75rem;
  font-size: .9375rem;
  font-family: inherit;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  transition: border-color .15s;
}

.form-group input {
  -webkit-appearance: none;
}

.form-group select {
  appearance: none;
}

.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .75rem center;
  padding-right: 2.25rem;
  cursor: pointer;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  background-color: var(--surface);
}

.form-group input:disabled,
.form-group select:disabled {
  opacity: .55;
  cursor: not-allowed;
}

.form-group--row {
  display: flex;
  align-items: center;
  gap: .625rem;
}

.form-group--row label {
  flex-shrink: 0;
  margin-bottom: 0;
  min-width: 5rem;
}

.form-group--row select,
.form-group--row input {
  flex: 1;
}

.btn {
  display: inline-block;
  padding: .625rem 1.25rem;
  font-size: .9375rem;
  font-family: inherit;
  font-weight: 500;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: background .15s;
  text-align: center;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  width: 100%;
  margin-top: .25rem;
}

.btn-sm {
  width: auto;
  padding: .5rem 1.25rem;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

.btn-primary:hover { background: var(--accent-hover); }

/* ── Filter tabs ── */
.filter-tabs {
  display: flex;
  gap: .5rem;
  margin-bottom: 1rem;
}

.filter-tab {
  padding: .375rem .875rem;
  border-radius: 999px;
  font-size: .8125rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  text-decoration: none;
  transition: all .15s;
}

.filter-tab:hover { color: var(--text); border-color: #a1a1aa; text-decoration: none; }
.filter-tab.active { background: var(--text); color: #fff; border-color: var(--text); }

/* ── Invoice table ── */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .875rem;
}

th {
  text-align: left;
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--text-muted);
  padding: .5rem .625rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

th:last-child, td:last-child { min-width: unset; }

td {
  padding: .5rem .625rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

tr:last-child td { border-bottom: none; }

/* ── Badges ── */
.badge {
  display: inline-block;
  padding: .2rem .55rem;
  border-radius: 999px;
  font-size: .75rem;
  font-weight: 600;
}

.badge-paid { background: #dcfce7; color: var(--success); }
.badge-unpaid { background: #fee2e2; color: var(--danger); }

/* ── Unpaid total ── */
.unpaid-total {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--danger);
}

.unpaid-total--clear { color: var(--success); }

/* ── Empty state ── */
.empty { color: var(--text-muted); font-size: .9rem; padding: .5rem 0; }

/* ── Auth pages ── */
.auth-wrap {
  min-height: calc(100vh - 52px - 1.5rem - 3rem); /* subtract .page padding-top + padding-bottom */
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem 1.5rem;
  width: 100%;
  max-width: 380px;
}

.auth-card h1 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

/* ── Page header ── */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  gap: .5rem;
}

.page-header .btn,
.page-header .btn-sm {
  margin-left: 0;
  margin-right: 0;
}

.page-header a.btn:first-child,
.page-header a.btn-sm:first-child {
  padding-left: 0;
}

.page-header-actions {
  display: flex;
  gap: .5rem;
  align-items: center;
}

/* ── Icon buttons ── */
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text-muted);
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
  flex-shrink: 0;
}

.btn-icon:hover { background: var(--surface); color: var(--text); border-color: #a1a1aa; }

.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-danger:hover { background: #b91c1c; border-color: #b91c1c; color: #fff; }

.btn-success { background: var(--success); border-color: var(--success); color: #fff; }
.btn-success:hover { background: #15803d; border-color: #15803d; color: #fff; }

.btn-icon.btn-danger { color: #fff; }
.btn-icon.btn-success { color: #fff; }

.text-danger { color: var(--danger); }

.row-actions { display: flex; gap: .375rem; align-items: center; white-space: nowrap; }

/* ── Card row (flex header inside a card) ── */
.card-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: .875rem;
}

.detail-sub {
  font-size: .8125rem;
  color: var(--text-muted);
  margin-top: .2rem;
}

/* ── Checkbox ── */
.form-check {
  margin-bottom: 1.25rem;
}

.check-label {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .875rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}

.check-label input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.check-box {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  transition: background .15s, border-color .15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.check-label:hover .check-box {
  border-color: var(--accent);
}

.check-label input[type="checkbox"]:checked + .check-box {
  background: var(--accent);
  border-color: var(--accent);
}

.check-label input[type="checkbox"]:checked + .check-box::after {
  content: '';
  display: block;
  width: 9px;
  height: 5px;
  border-left: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: rotate(-45deg) translateY(-1px);
}

/* ── Download button ── */
.btn-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-left: .5rem;
  padding: .25rem;
  border: 1px solid var(--accent);
  border-radius: 4px;
  color: var(--accent);
  vertical-align: middle;
  line-height: 0;
}

.btn-download:hover {
  background: var(--accent);
  color: #fff;
  text-decoration: none;
}

/* ── Pagination ── */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .25rem;
  padding-top: 1rem;
}

.page-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2rem;
  height: 2rem;
  padding: 0 .5rem;
  border-radius: 6px;
  font-size: .8125rem;
  font-weight: 500;
  color: var(--text-muted);
  border: 1px solid var(--border);
  background: var(--surface);
  text-decoration: none;
  transition: all .15s;
}

.page-btn:hover { color: var(--text); border-color: #a1a1aa; text-decoration: none; }
.page-btn.active { background: var(--text); color: #fff; border-color: var(--text); }
.page-btn.disabled { opacity: .4; pointer-events: none; cursor: default; }

html.dark .page-btn.active { color: #09090b; }

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--border);
  padding: 1rem;
  text-align: center;
  font-size: .8125rem;
  color: var(--text-muted);
}

/* ── Section divider ── */
.section-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}

/* ── Modal ── */
.modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal-backdrop:not([hidden]) {
  display: flex;
}

.modal-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  width: 100%;
  max-width: 380px;
  margin: 1rem;
  box-shadow: 0 8px 32px rgba(0,0,0,.18);
  position: relative;
}

.modal-close {
  position: absolute;
  top: .75rem;
  right: .75rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  padding: 2px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover { color: var(--text); }

.modal-message {
  margin: 0 0 1.25rem;
  font-size: .9375rem;
  padding-right: 1.25rem;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: .5rem;
}

/* ── Mobile ── */
@media (max-width: 639px) {
  /* Hamburger menu */
  .hamburger { display: flex; }
  .nav-actions { margin-left: auto; }

  .nav-links {
    display: none;
    position: absolute;
    top: 52px;
    left: 0;
    right: 0;
    margin-left: 0;
    flex-direction: column;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 4px 8px rgba(0,0,0,.08);
    z-index: 9;
    gap: 0;
  }

  .nav-links.nav-open { display: flex; }

  .nav-links a,
  .nav-links .btn-link {
    display: block;
    width: 100%;
    padding: .75rem 1rem;
    font-size: .9375rem;
    color: var(--text);
    font-weight: 500;
    text-align: left;
    border-top: 1px solid var(--border);
  }

  .nav-links form { display: contents; }

  .nav-links a:hover,
  .nav-links .btn-link:hover {
    background: var(--bg);
    color: var(--text);
    text-decoration: none;
  }

  /* Tighter page vertical rhythm */
  .page { padding: 0.625rem 1rem 1rem; }
  .page-title { font-size: 1.1rem; margin-bottom: 0.75rem; }

  /* Compact cards */
  .card { padding: 0.875rem; margin-bottom: 0.5rem; }
  .card-title { margin-bottom: 0.5rem; }

  /* Detail rows: tighter + handle long values without overflow */
  .detail-row { padding: 0.25rem 0; font-size: 0.85rem; }
  .detail-label { flex-shrink: 0; padding-right: 0.5rem; }
  .detail-value { flex: 1; min-width: 0; text-align: right; word-break: break-word; }

  /* Filter tabs */
  .filter-tabs { margin-bottom: 0.625rem; }
  .filter-tab { padding: 0.25rem 0.625rem; font-size: 0.75rem; }

  /* Invoice table: compact cells, full horizontal scroll */
  table { font-size: 0.8125rem; }
  th { padding: 0.375rem 0.5rem; }
  td { padding: 0.4rem 0.5rem; }

  /* Auth pages: subtract the mobile .page padding (0.625rem + 1rem) */
  .auth-wrap { min-height: calc(100vh - 52px - 0.625rem - 1rem); }

  /* Profile forms */
  .form-group { margin-bottom: 0.75rem; }
  .form-group input { padding: 0.5rem 0.625rem; font-size: 0.9rem; }
  .btn-sm { width: 100%; margin-left: 0; margin-right: 0; }
  .page-header .btn-sm, .page-header .btn { width: auto; }
}