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

:root {
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --heading-font: var(--font-family);
  --primary: #2a6f97;
  --primary-dark: #1a4b6d;
  --accent: #f0c040;
  --bg: #f5f7fa;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #d1d5db;
  --radius: 8px;
  --radius-sm: 4px;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.1);
  --header-bg: var(--primary);
  --header-text: #ffffff;
  --header-hover: rgba(255,255,255,0.15);
  --btn-bg: var(--primary);
  --btn-hover: var(--primary-dark);
  --btn-text: #ffffff;
  --btn-disabled: #94a3b8;
  --footer-bg: var(--primary-dark);
  --footer-text: rgba(255,255,255,0.7);
  --input-focus: 0 0 0 3px rgba(42,111,151,0.15);
  --radio-checked: rgba(42,111,151,0.08);
  --sepa-bg: #f0f7fb;
  --sepa-border: var(--primary);
  --paypal-bg: #f9fafb;
  --link-color: var(--primary);
  --success-color: #059669;
  --spinner-track: #e2e8f0;
  --max-width: 820px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-family);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background: var(--bg-overlay);
  opacity: var(--bg-overlay-opacity, 1);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 16px;
}

/* Header */
header {
  background: var(--header-bg);
  color: var(--header-text);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(0,0,0,0.15);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 8px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--header-text);
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
}

nav { display: flex; gap: 4px; }

nav a {
  color: var(--header-text);
  text-decoration: none;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
  cursor: pointer;
  font-size: 0.95rem;
  white-space: nowrap;
}

nav a {
  transition: background 0.2s, transform 0.2s, color 0.2s;
}

nav a:hover {
  background: var(--header-hover);
  transform: var(--nav-hover-transform, none);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--header-text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px 8px;
}

/* Theme switcher */
.theme-picker { position: relative; }

.theme-btn {
  background: var(--header-hover);
  border: none;
  color: var(--header-text);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
  line-height: 1;
}

.theme-btn:hover { background: rgba(255,255,255,0.25); }

.theme-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 6px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  min-width: 200px;
  z-index: 200;
  padding: 6px;
}

.theme-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 12px;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 0.9rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  text-align: left;
  font-family: var(--font-family);
}

.theme-option:hover { background: var(--radio-checked); }

.theme-option.active {
  background: var(--radio-checked);
  font-weight: 600;
}

.theme-swatch {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  flex-shrink: 0;
  border: 1px solid var(--border);
}

.swatch-default { background: #2a6f97; }
.swatch-bunt { background: linear-gradient(135deg, #e74c8b, #f39c12); }
.swatch-natur { background: #27ae60; }
.swatch-meer { background: #00838f; }
.swatch-sunset { background: linear-gradient(135deg, #e67e22, #e74c8b); }
.swatch-dunkel { background: #1e293b; }
.swatch-schlicht { background: #475569; }
.swatch-corporate { background: #1e3a5f; }
.swatch-retro { background: #cd5c5c; }
.swatch-luxus { background: linear-gradient(135deg, #8e793e, #f0c040); }

/* Main */
#content {
  flex: 1;
  padding-top: 32px;
  padding-bottom: 48px;
}

/* Home */
.home h1 {
  font-size: 2rem;
  margin-bottom: 12px;
  color: var(--primary-dark);
  font-family: var(--heading-font);
}

.lead {
  font-size: 1.1rem;
  color: var(--text-light);
  margin-bottom: 32px;
  max-width: 640px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--card-accent, transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  transform: var(--card-hover-transform, translateY(-4px));
  box-shadow: var(--card-hover-shadow, var(--shadow-lg));
}

.card:hover::before {
  opacity: var(--card-accent-opacity, 0);
}

.card h3 {
  color: var(--primary);
  margin-bottom: 8px;
  font-size: 1.1rem;
}

.card p { color: var(--text-light); font-size: 0.95rem; }

.welcome-card { max-width: 720px; margin: 0 auto 32px; }

.section-title {
  font-size: 1.35rem;
  color: var(--primary);
  margin-bottom: 16px;
  font-family: var(--heading-font);
}

.benefits {
  list-style: none;
  display: grid;
  gap: 10px;
  margin-bottom: 24px;
}

.benefits li {
  background: var(--card-bg);
  padding: 14px 20px 14px 42px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  position: relative;
  color: var(--text-light);
  font-size: 0.95rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.benefits li::before {
  content: '✓';
  position: absolute;
  left: 16px;
  top: 14px;
  color: var(--primary);
  font-weight: 700;
  font-size: 1rem;
}

.benefits li:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-lg);
}

.closing-text {
  font-size: 0.95rem;
  color: var(--text-light);
  margin-bottom: 24px;
  padding: 14px 20px;
  background: var(--card-bg);
  border-radius: var(--radius);
  border-left: 4px solid var(--primary);
  box-shadow: var(--shadow);
  font-style: italic;
}

.cta { text-align: center; margin: 32px 0; }

/* Buttons */
.btn {
  display: inline-block;
  background: var(--btn-bg);
  color: var(--btn-text);
  padding: 12px 32px;
  border-radius: var(--radius);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.3s, transform 0.25s, box-shadow 0.25s, opacity 0.2s;
  position: relative;
  overflow: hidden;
}

.btn:hover {
  background: var(--btn-hover);
  transform: var(--btn-hover-transform, translateY(-1px));
  box-shadow: var(--btn-hover-shadow, none);
}

.btn:active {
  transform: var(--btn-active-transform, translateY(0));
}

.btn:disabled {
  background: var(--btn-disabled);
  cursor: not-allowed;
  opacity: 0.8;
}

/* Donate form */
.donate h1 {
  font-size: 1.75rem;
  margin-bottom: 20px;
  color: var(--primary-dark);
  font-family: var(--heading-font);
}

form {
  background: var(--card-bg);
  padding: 24px 28px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.field { display: flex; flex-direction: column; }

.field label {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 4px;
  color: var(--text);
}

.field input, .field select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: var(--font-family);
  transition: border-color 0.2s;
  background: var(--card-bg);
  color: var(--text);
}

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

/* Amount */
.amount-select {
  border: none;
  margin: 0 0 24px;
  padding: 0;
}

.amount-select legend {
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 10px;
  color: var(--text);
}

.amount-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.amount-radio {
  padding: 10px 18px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  margin-bottom: 0;
}

.amount-radio:has(input:checked) {
  border-color: var(--primary);
  background: var(--radio-checked);
  box-shadow: var(--radio-checked-shadow, none);
}

.amount-radio input[type="radio"] {
  display: none;
}

.amount-custom {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.amount-input {
  width: 72px;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font-family);
  text-align: center;
  background: var(--card-bg);
  color: var(--text);
}

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

.amount-input[type="number"]::-webkit-outer-spin-button,
.amount-input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.amount-input[type="number"] {
  -moz-appearance: textfield;
}

.amount-suffix {
  font-size: 0.95rem;
  color: var(--text);
}

.amount-summary {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

/* Payment */
.payment-method {
  border: none;
  margin: 24px 0 16px;
  padding: 0;
}

.payment-method legend {
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 10px;
  color: var(--text);
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  cursor: pointer;
  font-size: 0.95rem;
}

.radio-label input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

/* SEPA */
.sepa-fields {
  background: var(--sepa-bg);
  border-radius: var(--radius);
  padding: 20px;
  margin: 16px 0;
  border-left: 4px solid var(--sepa-border);
}

.sepa-fields h3 {
  font-size: 1rem;
  margin-bottom: 4px;
  color: var(--primary-dark);
}

.note {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 12px;
}

/* PayPal */
.paypal-placeholder {
  text-align: center;
  padding: 20px;
  margin: 16px 0;
  background: var(--paypal-bg);
  border-radius: var(--radius);
}

.paypal-placeholder img {
  max-width: 100%;
  height: auto;
  display: inline-block;
}

.form-actions {
  text-align: center;
  margin-top: 24px;
}

/* Thank you */
.thankyou {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 48px 32px;
  box-shadow: var(--shadow);
  text-align: center;
}

.thankyou h1 {
  color: var(--primary-dark);
  margin-bottom: 12px;
  font-family: var(--heading-font);
}

.thankyou p {
  color: var(--text-light);
  margin-bottom: 24px;
  font-size: 1.1rem;
}

.thankyou .btn + .btn {
  margin-left: 8px;
}

/* PayPal Zwischenseite */
.paypal-waiting {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 48px 32px;
  box-shadow: var(--shadow);
  text-align: center;
}

.paypal-waiting h2 {
  color: var(--primary-dark);
  margin-bottom: 8px;
  font-size: 1.35rem;
}

.paypal-waiting p {
  color: var(--text-light);
  margin: 8px 0;
}

.paypal-waiting .btn {
  margin-top: 16px;
}

.paypal-waiting-inner {
  max-width: 360px;
  margin: 0 auto;
}

/* Animations */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 5px var(--glow-color, transparent); }
  50% { box-shadow: 0 0 20px var(--glow-color, transparent), 0 0 40px var(--glow-color, transparent); }
}

@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}

@keyframes wiggle {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(-3deg); }
  75% { transform: rotate(3deg); }
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

#content > * {
  animation: fade-up 0.5s ease-out;
}

/* Spinner */
.spinner {
  width: 40px;
  height: 40px;
  margin: 0 auto 20px;
  border: 4px solid var(--spinner-track);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Button outline */
.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
}

/* Impressum */
.impressum h1 {
  font-size: 1.75rem;
  color: var(--primary-dark);
  margin-bottom: 20px;
  font-family: var(--heading-font);
}

.impressum h2 {
  font-size: 1.15rem;
  color: var(--primary);
  margin-top: 24px;
  margin-bottom: 6px;
}

.impressum h3 {
  font-size: 1rem;
  margin-top: 14px;
  margin-bottom: 4px;
  color: var(--text);
}

.impressum p {
  color: var(--text-light);
  line-height: 1.7;
}

.impressum a { color: var(--link-color); }

/* Footer */
footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  text-align: center;
  padding: 16px 0;
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 640px) {
  .nav-toggle { display: block; }

  nav {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--header-bg);
    flex-direction: column;
    padding: 8px 16px 16px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.15);
  }

  nav.open { display: flex; }

  .form-grid { grid-template-columns: 1fr; }

  .amount-options { flex-direction: column; }

  .amount-radio { justify-content: center; }

  .home h1 { font-size: 1.5rem; }

  .cards { grid-template-columns: 1fr; }

  form { padding: 16px; }

  .sepa-fields { padding: 16px; }
}

@media (min-width: 641px) and (max-width: 1024px) {
  .cards { grid-template-columns: 1fr 1fr; }
}