@import url('https://fonts.googleapis.com/css2?family=Work+Sans:wght@300;400;500;600;700&display=swap');

:root {
  --c-black:    #000000;
  --c-dark:     #00040f;
  --c-darker:   #03091c;
  --c-accent:   #0fd4ff;
  --c-mid:      #555555;
  --c-muted:    #94afd6;
  --c-light:    #cadbf4;
  --c-border:   #e5e7eb;
  --c-white:    #ffffff;

  --c-bg:       #ffffff;
  --c-sidebar:  #00040f;
  --c-text:     #03091c;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Work Sans', sans-serif;
  font-size: 14px;
  background: var(--c-bg);
  color: var(--c-text);
  -webkit-font-smoothing: antialiased;
}

/* ── Sidebar ── */
.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: 220px;
  height: 100vh;
  background: var(--c-sidebar);
  color: var(--c-white);
  display: flex;
  flex-direction: column;
  z-index: 200;
  transition: transform .25s ease;
}
.sidebar-logo {
  padding: 22px 24px 18px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -.5px;
  color: var(--c-white);
  border-bottom: 1px solid rgba(255,255,255,.1);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
}
.sidebar-logo sup { font-size: 13px; vertical-align: super; color: var(--c-accent); }
.sidebar-nav { padding: 16px 0; flex: 1; overflow-y: auto; }
.nav-section {
  padding: 14px 24px 4px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--c-muted);
  font-weight: 500;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 24px;
  color: rgba(255,255,255,.65);
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 400;
  transition: background .15s, color .15s;
}
.nav-item:hover  { color: var(--c-white); background: rgba(255,255,255,.07); }
.nav-item.active { color: var(--c-accent); background: rgba(15,212,255,.08); }
.nav-item .nav-icon { font-size: 12px; width: 16px; text-align: center; opacity: .7; }
.nav-item.active .nav-icon { opacity: 1; }
.sidebar-footer {
  padding: 16px 24px;
  border-top: 1px solid rgba(255,255,255,.08);
}
.sidebar-footer button {
  background: none; border: none;
  color: rgba(255,255,255,.4);
  cursor: pointer; font-size: 12px;
  font-family: 'Work Sans', sans-serif;
  padding: 0; transition: color .15s;
}
.sidebar-footer button:hover { color: var(--c-white); }

/* Mobile hamburger */
.hamburger {
  display: none;
  position: fixed;
  top: 14px; left: 14px;
  z-index: 300;
  background: var(--c-dark);
  border: none;
  color: var(--c-white);
  width: 40px; height: 40px;
  border-radius: 6px;
  font-size: 18px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 150;
}

/* ── Main ── */
.main-content {
  margin-left: 220px;
  padding: 32px 36px;
  max-width: 1140px;
}
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
  gap: 12px;
  flex-wrap: wrap;
}
.page-header h2 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -.3px;
  color: var(--c-darker);
}

/* ── Stat cards ── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}
.stat-card {
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 20px 22px;
  background: var(--c-white);
}
.stat-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .8px;
  color: var(--c-muted);
  margin-bottom: 6px;
  font-weight: 500;
}
.stat-value {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -.5px;
  color: var(--c-darker);
}
.stat-sub { font-size: 12px; color: var(--c-muted); margin-top: 3px; }

/* ── Tables ── */
.k2-table { width: 100%; border-collapse: collapse; }
.k2-table th {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .6px;
  color: var(--c-muted);
  font-weight: 500;
  padding: 0 12px 10px;
  border-bottom: 1px solid var(--c-border);
  text-align: left;
}
.k2-table td {
  padding: 11px 12px;
  border-bottom: 1px solid #f4f6f9;
  vertical-align: middle;
  font-size: 13.5px;
}
.k2-table tbody tr:hover { background: #f8fafc; }
.k2-table .right { text-align: right; }
.k2-table .muted { color: var(--c-mid); }
.k2-table .actions { text-align: right; white-space: nowrap; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; font-size: 13px; font-weight: 500;
  border-radius: 6px; cursor: pointer; border: none;
  text-decoration: none;
  transition: background .15s, box-shadow .15s;
  font-family: 'Work Sans', sans-serif;
  white-space: nowrap;
}
.btn-primary {
  background: var(--c-darker);
  color: var(--c-white);
}
.btn-primary:hover { background: var(--c-accent); color: var(--c-darker); }
.btn-outline {
  background: var(--c-white);
  color: var(--c-darker);
  border: 1px solid var(--c-border);
}
.btn-outline:hover { border-color: var(--c-accent); color: var(--c-accent); }
.btn-danger { background: #dc2626; color: var(--c-white); }
.btn-danger:hover { background: #b91c1c; }
.btn-sm { padding: 5px 12px; font-size: 12px; }
.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }

/* ── Forms ── */
.form-card {
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 28px;
  max-width: 580px;
  background: var(--c-white);
}
.form-row { display: grid; gap: 16px; margin-bottom: 16px; }
.form-row.cols-2 { grid-template-columns: 1fr 1fr; }
.form-row.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
.form-row.cols-1-2 { grid-template-columns: 1fr 2fr; }
.form-row.cols-3-1 { grid-template-columns: 3fr 1fr; }
.form-group { display: flex; flex-direction: column; gap: 5px; }
.form-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--c-muted);
  font-weight: 500;
}
.form-control, .form-select {
  border: 1px solid var(--c-border);
  border-radius: 6px;
  padding: 9px 12px;
  font-size: 14px;
  font-family: 'Work Sans', sans-serif;
  color: var(--c-darker);
  background: var(--c-white);
  width: 100%;
  transition: border-color .15s;
}
.form-control:focus, .form-select:focus {
  outline: none;
  border-color: var(--c-accent);
  box-shadow: 0 0 0 3px rgba(15,212,255,.1);
}
.form-actions { display: flex; gap: 10px; margin-top: 24px; flex-wrap: wrap; }

/* ── Status badges ── */
.badge {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .3px;
}
.badge-draft    { background: #fef3c7; color: #92400e; }
.badge-sent     { background: #dbeafe; color: #1e40af; }
.badge-paid     { background: #d1fae5; color: #065f46; }
.badge-open     { background: #fef3c7; color: #92400e; }
.badge-invoiced { background: #dbeafe; color: #1e40af; }
.badge-internal { background: #f3f4f6; color: #6b7280; }

/* ── Alerts ── */
.alert {
  padding: 11px 16px;
  border-radius: 6px;
  margin-bottom: 16px;
  font-size: 13.5px;
  font-weight: 400;
}
.alert-success { background: #d1fae5; color: #065f46; border-left: 3px solid #10b981; }
.alert-danger  { background: #fee2e2; color: #991b1b; border-left: 3px solid #ef4444; }
.alert-info    { background: #dbeafe; color: #1e40af; border-left: 3px solid #3b82f6; }

/* ── Month nav ── */
.month-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.month-nav span {
  font-size: 16px;
  font-weight: 600;
  min-width: 160px;
  text-align: center;
  color: var(--c-darker);
}

/* ── Login ── */
.login-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--c-dark);
}
.login-box {
  background: var(--c-white);
  border-radius: 10px;
  padding: 44px 40px;
  width: 360px;
  box-shadow: 0 20px 60px rgba(0,0,0,.4);
}
.login-logo {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -.5px;
  margin-bottom: 4px;
  color: var(--c-darker);
}
.login-logo sup { font-size: 16px; vertical-align: super; color: var(--c-accent); }
.login-sub { font-size: 13px; color: var(--c-muted); margin-bottom: 28px; }

/* ── Misc ── */
.two-col { display: grid; grid-template-columns: 1.4fr 1fr; gap: 28px; }
.section-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .8px;
  color: var(--c-muted);
  margin-bottom: 14px;
  font-weight: 500;
}
.empty-state {
  text-align: center;
  padding: 56px 0;
  color: var(--c-border);
}
.empty-state .icon { font-size: 32px; display: block; margin-bottom: 12px; }
.filter-tabs {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 20px;
  overflow-x: auto;
}
.filter-tab {
  padding: 8px 16px;
  font-size: 13px;
  cursor: pointer;
  border: none;
  background: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  color: var(--c-muted);
  font-family: 'Work Sans', sans-serif;
  white-space: nowrap;
  transition: color .15s;
}
.filter-tab.active {
  border-bottom-color: var(--c-accent);
  color: var(--c-darker);
  font-weight: 600;
}
.filter-tab:hover { color: var(--c-darker); }
.action-btn {
  background: none; border: none;
  color: var(--c-mid);
  cursor: pointer;
  font-size: 14px; padding: 3px 5px;
  transition: color .15s;
  border-radius: 4px;
}
.action-btn:hover { color: var(--c-darker); background: #f3f4f6; }
.action-btn.danger:hover { color: #dc2626; background: #fee2e2; }

/* ── Mobile ── */
@media (max-width: 768px) {
  .hamburger { display: flex; }

  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .sidebar-overlay.open {
    display: block;
  }

  .main-content {
    margin-left: 0;
    padding: 64px 16px 24px;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
  }
  .stat-card { padding: 14px 16px; }
  .stat-value { font-size: 18px; }

  .two-col { grid-template-columns: 1fr; }

  .form-card { padding: 20px 16px; max-width: none; }
  .form-row.cols-2,
  .form-row.cols-3,
  .form-row.cols-1-2,
  .form-row.cols-3-1 { grid-template-columns: 1fr; }

  .page-header h2 { font-size: 18px; }

  .k2-table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }

  .btn-group { gap: 6px; }
  .btn { padding: 8px 14px; font-size: 12px; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
}

/* ── Mobile table → card layout ─────────────────────────────────────────────── */
@media (max-width: 768px) {

  .k2-table { display: block; overflow-x: visible; }
  .k2-table thead { display: none; }
  .k2-table tbody { display: block; }
  .k2-table tbody tr {
    display: block;
    border: 1px solid var(--c-border);
    border-radius: 8px;
    margin-bottom: 10px;
    padding: 12px 14px;
    background: var(--c-white);
    box-shadow: 0 1px 3px rgba(0,0,0,.04);
  }
  .k2-table tbody tr:hover { background: var(--c-white); }
  .k2-table tbody td {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 4px 0;
    border: none;
    font-size: 13px;
    gap: 8px;
  }
  .k2-table tbody td::before {
    content: attr(data-label);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: var(--c-muted);
    font-weight: 500;
    white-space: nowrap;
    flex-shrink: 0;
    padding-top: 2px;
    min-width: 80px;
  }
  .k2-table tbody td.actions {
    justify-content: flex-end;
    padding-top: 8px;
    border-top: 1px solid #f3f4f6;
    margin-top: 4px;
  }
  .k2-table tbody td.actions::before { display: none; }
  .k2-table tbody td.right { text-align: right; }
  .two-col { gap: 20px; }
  .month-nav span { min-width: 120px; font-size: 14px; }
}

/* ── Mobile dashboard improvements ─────────────────────────────────────────── */
@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 16px;
  }
  .stat-card {
    padding: 12px 14px;
  }
  .stat-value {
    font-size: 17px;
    letter-spacing: -.3px;
  }
  .stat-label {
    font-size: 9px;
    margin-bottom: 4px;
  }
  .stat-sub {
    font-size: 10px;
  }

  /* Invoice detail on mobile */
  .form-card {
    padding: 16px 14px;
  }

  /* Filter tabs scroll */
  .filter-tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    flex-wrap: nowrap;
    scrollbar-width: none;
  }
  .filter-tabs::-webkit-scrollbar { display: none; }

  /* Action buttons bigger tap target */
  .action-btn {
    padding: 6px 8px;
    font-size: 15px;
  }

  /* Page header */
  .page-header {
    margin-bottom: 16px;
  }

  /* Hide less important columns on mobile */
  .k2-table tbody td[data-label="Pos."],
  .k2-table tbody td[data-label="Quelle"] {
    display: none;
  }
}

@media (max-width: 400px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
}
/* ── Mobile refinements ────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .action-btn {
    font-size: 18px;
    padding: 8px 10px;
    color: #555;
  }
  .k2-table tbody td {
    font-size: 14px;
    padding: 5px 0;
  }
  .k2-table tbody td::before {
    font-size: 11px;
    min-width: 100px;
  }
  .k2-table tbody tr {
    padding: 14px 16px;
    margin-bottom: 12px;
  }
  .badge {
    font-size: 12px;
    padding: 4px 10px;
  }
  .stat-value { font-size: 20px; }
  .stat-label { font-size: 10px; }
}

/* ── Mobile final polish ───────────────────────────────────────────────────── */
@media (max-width: 768px) {

  /* Größere Schrift, höherer Kontrast */
  body { font-size: 15px; }

  .k2-table tbody td {
    font-size: 15px;
    padding: 6px 0;
    color: #03091c;
  }
  .k2-table tbody td.muted { color: #555; }

  /* Labels linksbündig, alle gleich */
  .k2-table tbody td::before {
    font-size: 11px;
    min-width: 100px;
    color: #94afd6;
    text-align: left;
  }

  /* Betrag immer linksbündig auf Mobile */
  .k2-table tbody td.right {
    justify-content: space-between;
    text-align: left;
    font-weight: 600;
    font-size: 15px;
    color: #03091c;
  }

  /* Größere Icons */
  .action-btn {
    font-size: 18px;
    padding: 8px 10px;
    color: #555;
  }

  /* Badges größer */
  .badge {
    font-size: 12px;
    padding: 4px 10px;
  }

  /* Cards etwas mehr Luft */
  .k2-table tbody tr {
    padding: 14px 16px;
    margin-bottom: 12px;
  }

  /* Stat cards */
  .stat-value { font-size: 20px; color: #03091c; }
  .stat-label { font-size: 10px; color: #555; }
  .stat-sub   { font-size: 11px; }
}