:root {
  --cream: #FDF8F0;
  --warm-white: #FFFFFF;
  --orange: #E8622A;
  --orange-light: #FDF0E8;
  --orange-mid: #F5C4A4;
  --teal: #2A9D8F;
  --teal-light: #E0F5F3;
  --brown: #2D1810;
  --brown-mid: #7A4030;
  --brown-light: #C4907A;
  --gray-warm: #F0EAE2;
  --gray-text: #8A6050;
  --green: #4A7C59;
  --green-light: #E8F5EC;
  --purple: #6B4FBB;
  --purple-light: #EEE8FF;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Nunito', sans-serif;
  color: var(--brown);
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--cream);
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  display: flex;
  justify-content: center;
}

.syne {
  font-family: 'Syne', sans-serif;
  letter-spacing: -0.02em;
}

h1.headline {
  font-size: 2.2rem;
  line-height: 1.1;
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

.highlight {
  color: var(--orange);
}

p {
  line-height: 1.7;
}

/* Base Layout (Mobile First - 375px Focus) */
.screen {
  width: 100%;
  max-width: 450px;
  min-height: 100vh;
  background-color: var(--cream);
  display: none;
  flex-direction: column;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  margin: 0 auto;
}

.screen.active {
  display: flex;
  animation: fadeUp 0.3s ease forwards;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Utility Classes */
.hidden { display: none !important; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.text-center { text-align: center; }
.w-100, .full-width { width: 100%; }
.flex-grow { flex-grow: 1; }
.green-text { color: var(--green) !important; }

/* Buttons */
.btn {
  border: none;
  border-radius: 16px;
  padding: 16px 20px;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  width: 100%;
  transition: all 0.2s ease;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
}

.btn.primary {
  background-color: var(--orange);
  color: white;
  box-shadow: 0 4px 0 var(--brown-mid);
}

.btn.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 5px 0 var(--brown-mid);
}

.btn.primary:active {
  transform: translateY(2px);
  box-shadow: 0 2px 0 var(--brown-mid);
}

.btn.primary:disabled {
  background-color: var(--gray-text);
  box-shadow: 0 4px 0 var(--brown-light);
  cursor: not-allowed;
}

.btn.secondary {
  background-color: var(--warm-white);
  border: 2px solid var(--gray-warm);
  color: var(--brown);
}

.btn.secondary:hover {
  background-color: var(--orange-light);
  border-color: var(--orange-mid);
  transform: translateY(-1px);
}

.btn.secondary:active {
  transform: translateY(1px);
}

.btn-reserve {
  background-color: transparent;
  border: 2px solid var(--orange);
  color: var(--orange);
  border-radius: 12px;
  padding: 8px 16px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-reserve:hover {
  background-color: var(--orange);
  color: white;
}

.btn-reserve.reserved {
  background-color: var(--gray-warm) !important;
  border-color: var(--gray-warm) !important;
  color: var(--gray-text) !important;
  cursor: not-allowed;
}

.icon-btn {
  background: none;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  color: var(--brown-mid);
  cursor: pointer;
  padding: 8px 0;
}

/* S1: Hero */
.hero {
  padding: 24px 20px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.hero-image-wrapper {
  position: relative;
  margin-top: 10px;
  margin-bottom: 20px;
}

.hero-image {
  width: 140px;
  height: 140px;
  object-fit: cover;
  border-radius: 20px;
  transform: rotate(-1deg);
  box-shadow: 6px 6px 0 var(--orange);
  border: 4px solid var(--warm-white);
  background: var(--gray-warm);
}

.badge {
  position: absolute;
  bottom: -10px;
  right: -20px;
  background-color: var(--orange);
  color: white;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
  transform: rotate(4deg);
  box-shadow: 2px 2px 0 var(--brown-mid);
}

.intro-text {
  color: var(--brown-mid);
  margin-bottom: 20px;
  font-size: 1.05rem;
}

.chips-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 32px;
}

.chip {
  background-color: var(--orange-light);
  color: var(--brown-mid);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.button-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
}

/* Progress Card */
.progress-card {
  background-color: var(--warm-white);
  padding: 20px;
  border-radius: 20px;
  width: 100%;
  box-shadow: 0 4px 12px rgba(45, 24, 16, 0.05);
  margin-bottom: 32px;
  text-align: left;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
  font-weight: 700;
}

.progress-amount {
  color: var(--orange);
}

.progress-bar-container {
  height: 12px;
  background-color: var(--gray-warm);
  border-radius: 6px;
  overflow: hidden;
  position: relative;
}

.progress-bar {
  height: 100%;
  background-color: var(--green);
  border-radius: 6px;
  transition: width 0.6s ease;
}

.progress-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--gray-text);
  font-weight: 600;
}

/* Topbar & Content layout */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  position: sticky;
  top: 0;
  background-color: var(--cream);
  z-index: 10;
  border-bottom: 1px solid var(--gray-warm);
}

.topbar h2 {
  font-size: 1.3rem;
}

.content {
  padding: 20px;
  padding-bottom: 20px;
}

.bottom-cta, .bottom-action-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  max-width: 450px;
  margin: 0 auto;
  padding: 16px 20px 32px;
  background: linear-gradient(to top, var(--cream) 80%, rgba(253,248,240,0));
  z-index: 20;
}

/* Why Items */
.why-list {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.why-item {
  display: flex;
  gap: 16px;
  background-color: var(--warm-white);
  padding: 16px;
  border-radius: 16px;
  box-shadow: 0 2px 8px rgba(45, 24, 16, 0.03);
}

.why-icon {
  font-size: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--orange-light);
  width: 100px;
  height: 100px;
  border-radius: 16px;
  flex-shrink: 0;
}

.why-content h3 {
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.why-content p {
  font-size: 0.9rem;
  color: var(--brown-mid);
}

/* Tabs */
.tabs {
  display: flex;
  padding: 0 20px;
  gap: 8px;
  margin-top: 16px;
  margin-bottom: 16px;
}

.tab {
  flex: 1;
  background-color: var(--gray-warm);
  border: none;
  padding: 12px 0;
  border-radius: 12px;
  font-weight: 700;
  color: var(--gray-text);
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab.active {
  background-color: var(--brown);
  color: white;
}

.tab-content {
  padding: 0 20px 120px;
}

/* Info Box */
.info-box {
  padding: 16px;
  border-radius: 16px;
  font-size: 0.9rem;
  line-height: 1.5;
  margin-bottom: 24px;
}
.info-box.teal-light { background-color: var(--teal-light); color: var(--teal); }
.info-box.orange-light { background-color: var(--orange-light); color: var(--brown-mid); }
.info-box.gray-bg { background-color: var(--gray-warm); color: var(--brown-mid); }
.text-small { font-size: 0.85rem; }

/* Part Cards */
.parts-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.part-card {
  background-color: var(--warm-white);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 2px 8px rgba(45, 24, 16, 0.04);
  border: 2px solid transparent;
  transition: all 0.2s ease;
}

.part-card.reserved {
  opacity: 0.6;
}

.part-header {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
}

.part-icon {
  font-size: 1.8rem;
  background-color: var(--gray-warm);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  flex-shrink: 0;
}

.part-info {
  flex: 1;
}

.part-name {
  font-weight: 800;
  font-size: 1.1rem;
}

.part-sub {
  font-size: 0.85rem;
  color: var(--brown-light);
  margin-top: 2px;
}

.tier-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 8px;
  margin-bottom: 4px;
}
.tier-1 { background-color: var(--purple-light); color: var(--purple); }
.tier-2 { background-color: var(--orange-light); color: var(--orange); }
.tier-3 { background-color: var(--teal-light); color: var(--teal); }
.tier-4 { background-color: var(--green-light); color: var(--green); }
.tier-peripherie { background-color: #E6F0FF; color: #2B6CB0; }

.part-note {
  font-size: 0.85rem;
  color: var(--teal);
  background-color: var(--teal-light);
  padding: 6px 10px;
  border-radius: 8px;
  margin-bottom: 12px;
  font-weight: 600;
}

.part-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--gray-warm);
  padding-top: 12px;
  margin-top: 12px;
}

.part-price {
  font-weight: 800;
  font-size: 1.1rem;
}

/* Summary Table */
.summary-card {
  background-color: var(--warm-white);
  border-radius: 16px;
  padding: 16px;
  margin-top: 32px;
  box-shadow: 0 4px 12px rgba(45, 24, 16, 0.03);
}

.summary-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 0.95rem;
}

.summary-row.large {
  font-size: 1.1rem;
  font-weight: 800;
}

.divider {
  height: 2px;
  background-color: var(--gray-warm);
  margin: 10px 0;
}

/* Form Elements */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 700;
  margin-bottom: 8px;
  font-size: 0.95rem;
}

.form-group label .req { color: var(--orange); }

input[type="text"], input[type="number"], textarea {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--gray-warm);
  border-radius: 12px;
  font-size: 1rem;
  background-color: var(--warm-white);
  transition: border-color 0.2s;
  outline: none;
}

input:focus, textarea:focus {
  border-color: var(--orange-mid);
}

.selected-card {
  margin-bottom: 24px;
}

/* Amount Chips */
.amount-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.amount-chip {
  flex: 1 0 calc(33.333% - 12px);
  padding: 14px 0;
  border-radius: 12px;
  border: 2px solid var(--gray-warm);
  background-color: var(--warm-white);
  font-weight: 700;
  font-size: 1.1rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.amount-chip.active {
  border-color: var(--orange);
  background-color: var(--orange-light);
  color: var(--orange);
}

.amount-chip.outline {
  flex: 1 0 100%;
}

/* S5: Center Screen */
.center-screen {
  justify-content: center;
  align-items: center;
  padding: 20px;
  text-align: center;
}

.success-icon {
  font-size: 4rem;
  margin-bottom: 16px;
  animation: bounceIn 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes bounceIn {
  0% { transform: scale(0); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

/* Backers List */
.backers-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.backer-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background-color: var(--warm-white);
  padding: 12px 16px;
  border-radius: 16px;
  box-shadow: 0 2px 8px rgba(45, 24, 16, 0.02);
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 22px;
  background-color: var(--orange-light);
  color: var(--orange);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.backer-info {
  flex: 1;
}

.backer-name {
  font-weight: 700;
  color: var(--brown);
}

.backer-detail {
  font-size: 0.8rem;
  color: var(--brown-mid);
  margin-top: 2px;
}

.status-badge {
  font-size: 0.7rem;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.status-zugesagt {
  background-color: var(--orange-light);
  color: var(--orange);
}

.status-bezahlt {
  background-color: var(--green-light);
  color: var(--green);
}

/* Loader */
.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--gray-warm);
  border-top-color: var(--orange);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

#loading {
  justify-content: center;
  align-items: center;
  z-index: 100;
}

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

/* --- Image Modal / Lightbox --- */
#image-modal {
  display: flex;
  position: fixed;
  z-index: 9999;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.85);
  justify-content: center;
  align-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

#image-modal.active {
  opacity: 1;
  pointer-events: auto;
}

#image-modal.active.hidden {
  display: flex; /* override hidden */
}

.modal-content {
  max-width: 90%;
  max-height: 90%;
  border-radius: 20px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.5);
  transform: scale(0.9);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

#image-modal.active .modal-content {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 25px;
  color: white;
  font-size: 35px;
  font-weight: bold;
  cursor: pointer;
  z-index: 10000;
  text-shadow: 0 2px 5px rgba(0,0,0,0.5);
}

/* Ensure parents are above other elements on hover */
.part-card:hover, .why-item:hover {
  z-index: 10;
  position: relative;
}

/* Icon Hover Effects */
.part-icon img, .why-icon img {
  cursor: pointer;
  cursor: zoom-in;
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
}

.part-icon img:hover, .why-icon img:hover {
  transform: scale(1.4);
  z-index: 100;
}