/* ── CSS Custom Properties ─────────────────────────────────────────────── */
:root {
  --color-primary:       #185FA5;
  --color-primary-hover: #1350880;
  --color-success:       #0F6E56;
  --color-warning:       #BA7517;
  --color-danger:        #993C1D;
  --color-bg:            #ffffff;
  --color-bg-secondary:  #f5f5f3;
  --color-border:        rgba(0, 0, 0, 0.15);
  --color-text:          #1a1a18;
  --color-text-muted:    #5f5e5a;
  --radius:              8px;
  --shadow:              0 1px 4px rgba(0,0,0,0.08);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-bg-secondary);
}

a { color: var(--color-primary); }
input, select, textarea { font: inherit; }
button { cursor: pointer; font: inherit; }

/* ── Layout ────────────────────────────────────────────────────────────── */
.app-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.app-logo {
  font-weight: 700;
  font-size: 16px;
  padding: 14px 0;
  color: var(--color-primary);
  white-space: nowrap;
}

.app-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

/* ── Tab Navigation ────────────────────────────────────────────────────── */
.tab-nav {
  display: flex;
  gap: 0;
  flex: 1;
}

.tab-nav__btn {
  padding: 14px 18px;
  border: none;
  background: none;
  font-size: 14px;
  color: var(--color-text-muted);
  border-bottom: 3px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
}

.tab-nav__btn:hover { color: var(--color-text); }

.tab-nav__btn--active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: 600;
}

.tab-pane { display: none; }
.tab-pane--active { display: block; }

/* ── Login Screen ──────────────────────────────────────────────────────── */
.login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-secondary);
}

.login-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  width: 360px;
  box-shadow: var(--shadow);
}

.login-card h2 {
  font-size: 20px;
  margin-bottom: 20px;
}

/* ── Toolbar ───────────────────────────────────────────────────────────── */
.toolbar {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.toolbar__title {
  font-size: 18px;
  font-weight: 700;
  flex: 1;
}

/* ── Filter Bar ────────────────────────────────────────────────────────── */
.filter-bar {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  gap: 12px;
  align-items: flex-end;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.filter-bar .field { min-width: 120px; }

/* ── Form Fields ───────────────────────────────────────────────────────── */
.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.field label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.field input,
.field select {
  padding: 7px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  width: 100%;
  transition: border-color 0.15s;
}

.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--color-primary);
}

.input--error  { border-color: var(--color-danger) !important; }
.input--warning { border-color: var(--color-warning) !important; }

.field-error-tip {
  font-size: 11px;
  color: var(--color-danger);
  margin-top: 2px;
}

.field-warning-tip {
  font-size: 11px;
  color: var(--color-warning);
  margin-top: 2px;
}

/* ── Buttons ───────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius);
  border: none;
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
  transition: opacity 0.15s;
  white-space: nowrap;
}

.btn:disabled { opacity: 0.45; cursor: default; }
.btn:hover:not(:disabled) { opacity: 0.85; }

.btn--primary { background: var(--color-primary); color: #fff; }
.btn--success { background: var(--color-success); color: #fff; }
.btn--danger  { background: var(--color-danger);  color: #fff; }
.btn--ghost   { background: var(--color-bg); color: var(--color-text); border: 1px solid var(--color-border); }
.btn--sm      { padding: 5px 10px; font-size: 12px; }

/* ── Badges ────────────────────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: 2px 7px;
  border-radius: 99px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.badge--leasing { background: #dbeafe; color: #1d4ed8; }
.badge--kauf    { background: #dcfce7; color: #166534; }
.badge--vario      { background: #fef9c3; color: #854d0e; }
.badge--vario-kauf { background: #fef3c7; color: #92400e; }
.badge--abo        { background: #f3e8ff; color: #6b21a8; }
.badge--bev     { background: #d1fae5; color: #065f46; }
.badge--phev    { background: #ede9fe; color: #5b21b6; }
.badge--ice     { background: #fee2e2; color: #991b1b; }

/* ── Cards ─────────────────────────────────────────────────────────────── */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ── Offer Card (Angebote tab) ─────────────────────────────────────────── */
.offer-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 16px;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s;
  margin-bottom: 8px;
}

.offer-card:hover { border-color: var(--color-primary); box-shadow: 0 2px 8px rgba(24,95,165,0.1); }
.offer-card--expanded { border-color: var(--color-primary); }

.offer-card__header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.offer-card__name {
  font-weight: 700;
  font-size: 15px;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.offer-card__tco {
  font-size: 13px;
  color: var(--color-text-muted);
}

.offer-card__tco strong {
  font-size: 16px;
  color: var(--color-primary);
}

.offer-card__meta {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 6px;
  font-size: 12px;
  color: var(--color-text-muted);
}

.offer-card__actions {
  display: flex;
  gap: 6px;
  margin-left: auto;
}

/* ── Offer Detail (expandiert) ─────────────────────────────────────────── */
.offer-detail {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.offer-detail__table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.offer-detail__table td {
  padding: 4px 0;
  border-bottom: 1px solid var(--color-bg-secondary);
}

.offer-detail__table td:first-child { color: var(--color-text-muted); width: 55%; }
.offer-detail__table td:last-child  { font-weight: 600; text-align: right; }

.offer-detail__chart-wrap {
  max-width: 200px;
  margin: 0 auto;
}

/* ── Ranking Card ──────────────────────────────────────────────────────── */
.rank-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 16px;
  cursor: pointer;
  margin-bottom: 8px;
  transition: border-color 0.15s;
}

.rank-card:hover { border-color: var(--color-primary); }

.rank-card--best {
  border-color: var(--color-success);
  background: #f0faf7;
}

.rank-card__header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.rank-card__position {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--color-bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
  color: var(--color-text-muted);
}

.rank-card--best .rank-card__position {
  background: var(--color-success);
  color: #fff;
}

.rank-card__name { font-weight: 700; flex: 1; }

.rank-card__tco {
  text-align: right;
  font-size: 13px;
}

.rank-card__tco strong {
  font-size: 16px;
  color: var(--color-primary);
}

.rank-card--best .rank-card__tco strong { color: var(--color-success); }

.rank-card__delta {
  font-size: 11px;
  color: var(--color-text-muted);
}

.rank-bar-track {
  background: var(--color-bg-secondary);
  border-radius: 99px;
  height: 6px;
  overflow: hidden;
}

.rank-bar-fill {
  height: 100%;
  border-radius: 99px;
  background: var(--color-primary);
  transition: width 0.3s;
}

.rank-card--best .rank-bar-fill { background: var(--color-success); }

/* ── Offer Form ─────────────────────────────────────────────────────────── */
.offer-form {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.offer-form h2 { font-size: 18px; margin-bottom: 20px; }

.form-section-title {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin: 20px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--color-border);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.form-grid--2 { grid-template-columns: repeat(2, 1fr); }
.form-grid--4 { grid-template-columns: repeat(4, 1fr); }
.form-grid .span-2 { grid-column: span 2; }
.form-grid .span-3 { grid-column: span 3; }
.form-grid .span-full { grid-column: 1 / -1; }

.checkbox-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin: 10px 0;
}

.checkbox-row label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  cursor: pointer;
  user-select: none;
}

.form-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

/* ── Settings Tab ──────────────────────────────────────────────────────── */
.settings-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  max-width: 480px;
}

.settings-card h2 { font-size: 16px; margin-bottom: 16px; }

.settings-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

/* ── Inline Confirm ────────────────────────────────────────────────────── */
.confirm-row {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 10px 14px;
  background: #fef2f2;
  border: 1px solid #fca5a5;
  border-radius: var(--radius);
  font-size: 13px;
  color: var(--color-danger);
}

.confirm-row__msg { flex: 1; font-weight: 600; }

/* ── Feedback / Alerts ─────────────────────────────────────────────────── */
.alert {
  padding: 10px 14px;
  border-radius: var(--radius);
  font-size: 13px;
  margin-bottom: 12px;
}

.alert--error   { background: #fef2f2; border: 1px solid #fca5a5; color: var(--color-danger); }
.alert--success { background: #f0fdf4; border: 1px solid #86efac; color: var(--color-success); }
.alert--info    { background: #eff6ff; border: 1px solid #93c5fd; color: var(--color-primary); }

/* ── Empty State ───────────────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--color-text-muted);
}

.empty-state p { font-size: 15px; margin-bottom: 8px; }
.empty-state small { font-size: 13px; }

/* ── Groups (Gruppen tab) ──────────────────────────────────────────────── */
.group-section { margin-bottom: 32px; }
.group-section h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 10px;
}

/* ── Responsive: Table-Scroll Wrapper ──────────────────────────────────── */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

/* ── Energierechner-Panel ──────────────────────────────────────────────── */
.energie-rechner-panel {
  background: var(--color-surface-raised, #f8f9fa);
  border: 1px solid var(--color-border, #dee2e6);
  border-radius: 6px;
  padding: 12px;
  margin-bottom: 8px;
}

/* ── Responsive breakpoints ────────────────────────────────────────────── */
@media (max-width: 768px) {
  .app-main { padding: 16px; }
  .form-grid { grid-template-columns: repeat(2, 1fr); }
  .form-grid--4 { grid-template-columns: repeat(2, 1fr); }
  .offer-detail { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .form-grid { grid-template-columns: 1fr; }
  .form-grid .span-2,
  .form-grid .span-3,
  .form-grid .span-full { grid-column: 1; }
  .filter-bar { flex-direction: column; align-items: stretch; }
  .toolbar { flex-direction: column; align-items: flex-start; }
}