:root {
  color-scheme: light;

  /* — Farbe — */
  --accent: #0ea472;
  --accent-strong: #0b8a60;
  --accent-soft: #e3f5ee;
  --bg: #faf8f4;
  --surface: #ffffff;
  --surface-sunken: #f2efe9;
  --text: #212529;
  --text-secondary: #667085;
  --border: #e6e1d7;
  --border-strong: #d7d0c2;
  --focus-ring: #0ea472;
  --chart-line: #0ea472;
  --chart-grid: #dcd6c9;
  --shadow-color: 220 15% 25%;
  --danger: #b3261e;
  --danger-soft: #fbe9e7;

  /* — Statistik-Leiste: bewusst ein fester dunkler Farbraum in beiden Modi — */
  --stats-bg: #17251f;
  --stats-fg: #34d399;
  --stats-label: #b7c2bd;

  /* — Typ-Skala — */
  --fs-eyebrow: 0.8125rem;
  --fs-body: clamp(1rem, 0.965rem + 0.16vw, 1.125rem);
  --fs-lead: clamp(1.125rem, 1.06rem + 0.28vw, 1.375rem);
  --fs-h1: clamp(2.5rem, 2rem + 2.2vw, 3.75rem);
  --fs-h2: clamp(1.75rem, 1.55rem + 0.9vw, 2.375rem);
  --fs-h3: clamp(1.2rem, 1.13rem + 0.32vw, 1.375rem);
  --fs-stat: clamp(2.25rem, 1.9rem + 1.6vw, 3.25rem);
  --fs-small: 0.9rem;

  --font-display: "Inter", -apple-system, "Segoe UI", sans-serif;
  --font-body: "DM Sans", -apple-system, "Segoe UI", sans-serif;

  --radius-s: 8px;
  --radius-m: 12px;
  --space-section: clamp(4rem, 3.2rem + 3.5vw, 7.5rem);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --accent: #34d399;
    --accent-strong: #5eead4;
    --accent-soft: #133628;
    --bg: #1a1d20;
    --surface: #212529;
    --surface-sunken: #26292d;
    --text: #f2f0eb;
    --text-secondary: #9aa1a9;
    --border: #34383c;
    --border-strong: #40454a;
    --focus-ring: #34d399;
    --chart-line: #34d399;
    --chart-grid: #33373b;
    --shadow-color: 0 0% 0%;
    --danger: #ff8a80;
    --danger-soft: #3a2220;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --accent: #34d399;
  --accent-strong: #5eead4;
  --accent-soft: #133628;
  --bg: #1a1d20;
  --surface: #212529;
  --surface-sunken: #26292d;
  --text: #f2f0eb;
  --text-secondary: #9aa1a9;
  --border: #34383c;
  --border-strong: #40454a;
  --focus-ring: #34d399;
  --chart-line: #34d399;
  --chart-grid: #33373b;
  --shadow-color: 0 0% 0%;
  --danger: #ff8a80;
  --danger-soft: #3a2220;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--text);
  line-height: 1.12;
  letter-spacing: -0.02em;
  text-wrap: balance;
  margin: 0;
}

h1 { font-size: var(--fs-h1); font-weight: 800; }
h2 { font-size: var(--fs-h2); font-weight: 700; }
h3 { font-size: var(--fs-h3); font-weight: 700; }

p { margin: 0; }

a { color: inherit; }

img, svg { display: block; max-width: 100%; }

button { font: inherit; }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
  border-radius: 4px;
}

.icon-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

.icon {
  width: 22px;
  height: 22px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

/* — Layout-Grundgerüst — */
.wrap {
  width: min(1120px, 100% - 3rem);
  margin-inline: auto;
}

.prose {
  width: min(60ch, 100%);
  margin-inline: auto;
}

/* — Header — */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 96%, transparent);
  border-bottom: 1px solid var(--border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1.1rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.logo .logo-mark {
  color: var(--accent);
  width: 26px;
  height: 26px;
  stroke-width: 1.75;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.site-nav ul {
  display: flex;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a:not(.btn) {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: var(--fs-small);
  font-weight: 500;
  transition: color 0.15s ease;
}
.site-nav a:not(.btn):hover { color: var(--text); }

.nav-links { display: flex; }

@media (max-width: 640px) {
  .nav-links { display: none; }
}

/* — Buttons — */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-s);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

.btn-primary {
  background: var(--accent);
  color: #06281c;
  box-shadow: 0 1px 2px hsl(var(--shadow-color) / 0.12);
}
.btn-primary:hover:not(:disabled) { background: var(--accent-strong); box-shadow: 0 6px 16px -6px hsl(var(--shadow-color) / 0.35); }

.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-outline:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }

.btn-sm { padding: 0.55rem 1.1rem; font-size: 0.875rem; }
.btn-block { width: 100%; }

/* — Hero — */
.hero {
  padding-block: clamp(3.5rem, 2.8rem + 3vw, 6rem) var(--space-section);
  text-align: center;
}

.hero .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: var(--fs-eyebrow);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-strong);
  background: var(--accent-soft);
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  margin-bottom: 1.5rem;
}

.hero h1 { margin-bottom: 1.25rem; }

.hero .lead {
  font-size: var(--fs-lead);
  color: var(--text-secondary);
  margin-bottom: 2.25rem;
}

.hero-actions {
  display: flex;
  gap: 0.9rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: clamp(3rem, 2.4rem + 2.5vw, 4.5rem);
}

.hero-illustration {
  width: min(680px, 100%);
  margin-inline: auto;
}

.hero-illustration .price-line {
  fill: none;
  stroke: var(--chart-line);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.hero-illustration .price-fill { fill: url(#priceGradient); opacity: 0.5; }
.hero-illustration .grid-line { stroke: var(--chart-grid); stroke-width: 1; }
.hero-illustration .price-dot { fill: var(--surface); stroke: var(--accent); stroke-width: 2.5; }
.hero-illustration .price-tag {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 13px;
  fill: var(--accent-strong);
}
.hero-illustration .price-tag-old {
  font-family: var(--font-body);
  font-size: 12px;
  fill: var(--text-secondary);
  text-decoration: line-through;
}

.hero-illustration .receipt-outline {
  fill: var(--surface);
  stroke: var(--border-strong);
  stroke-width: 1.75;
  stroke-linejoin: round;
}
.hero-illustration .receipt-line {
  stroke: var(--border-strong);
  stroke-width: 3;
  stroke-linecap: round;
}
.hero-illustration .receipt-line-tracked {
  stroke: var(--accent);
}
.hero-illustration .receipt-dot { fill: var(--accent); }
.hero-illustration .connector {
  fill: none;
  stroke: var(--border-strong);
  stroke-width: 1.75;
  stroke-dasharray: 4 4;
  stroke-linecap: round;
}
.hero-illustration .connector-arrow {
  fill: none;
  stroke: var(--border-strong);
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

@media (prefers-reduced-motion: no-preference) {
  .hero-illustration .price-line {
    stroke-dasharray: 420;
    stroke-dashoffset: 420;
    animation: draw-line 1.2s ease-out 0.5s forwards;
  }
  .hero-illustration .price-fill { opacity: 0; animation: fade-in 0.8s ease-out 1.3s forwards; }
  .hero-illustration .price-dot, .hero-illustration .price-tag, .hero-illustration .price-tag-old {
    opacity: 0;
    animation: fade-in 0.5s ease-out 1.5s forwards;
  }
  .hero-illustration .receipt-outline {
    opacity: 0;
    animation: fade-in 0.5s ease-out forwards;
  }
  .hero-illustration .receipt-line {
    stroke-dasharray: 140;
    stroke-dashoffset: 140;
    animation: draw-line 0.5s ease-out 0.3s forwards;
  }
  .hero-illustration .receipt-dot { opacity: 0; animation: fade-in 0.3s ease-out 0.7s forwards; }
  .hero-illustration .connector, .hero-illustration .connector-arrow {
    stroke-dasharray: 90;
    stroke-dashoffset: 90;
    animation: draw-line 0.5s ease-out 0.8s forwards;
  }
}

@keyframes draw-line { to { stroke-dashoffset: 0; } }
@keyframes fade-in { to { opacity: 1; } }
@keyframes spin { to { transform: rotate(360deg); } }

/* — Section shell — */
section { padding-block: var(--space-section); }

.section-head {
  width: min(46ch, 100%);
  margin: 0 auto clamp(2.5rem, 2.1rem + 1.5vw, 3.5rem);
  text-align: center;
}

.section-head .eyebrow {
  display: block;
  font-size: var(--fs-eyebrow);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin-bottom: 0.75rem;
}

.section-head p {
  color: var(--text-secondary);
  margin-top: 0.75rem;
}

/* — Steps (Funktionsweise) — */
.steps {
  background: var(--surface-sunken);
  border-block: 1px solid var(--border);
}

.step-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  position: relative;
}

.step-flow::before {
  content: "";
  position: absolute;
  top: 26px;
  left: 16.6%;
  right: 16.6%;
  height: 0;
  border-top: 1.5px dashed var(--border-strong);
}

@media (max-width: 760px) {
  .step-flow { grid-template-columns: 1fr; gap: 2.5rem; }
  .step-flow::before { display: none; }
}

.step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding-inline: 1.25rem;
  position: relative;
}

.step-icon {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  background: var(--surface);
  border: 1.5px solid var(--border-strong);
  border-radius: 50%;
  color: var(--accent);
  margin-bottom: 1.25rem;
  position: relative;
  z-index: 1;
}

.step-icon .icon { width: 24px; height: 24px; }

.step h3 { margin-bottom: 0.5rem; }
.step p { color: var(--text-secondary); font-size: var(--fs-small); max-width: 26ch; }

/* — Features — */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  overflow: hidden;
}

@media (max-width: 640px) {
  .feature-grid { grid-template-columns: 1fr; }
}

.feature-card {
  background: var(--surface);
  padding: clamp(1.75rem, 1.5rem + 1vw, 2.5rem);
  transition: background-color 0.2s ease;
}

.feature-card:hover { background: var(--accent-soft); }

.feature-card .icon-badge {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-s);
  background: var(--accent-soft);
  color: var(--accent-strong);
  margin-bottom: 1.25rem;
}

.feature-card h3 { margin-bottom: 0.6rem; }
.feature-card p { color: var(--text-secondary); }

/* — Stats — */
.stats {
  background: var(--stats-bg);
  color: var(--stats-label);
  border-radius: var(--radius-m);
  width: min(1120px, 100% - 3rem);
  margin-inline: auto;
  padding-block: clamp(3rem, 2.5rem + 2vw, 4.5rem);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  text-align: center;
}

@media (max-width: 640px) {
  .stats-grid { grid-template-columns: 1fr; gap: 2.5rem; }
}

.stat .stat-value {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-stat);
  font-variant-numeric: tabular-nums;
  color: var(--stats-fg);
  letter-spacing: -0.02em;
}

.stat .stat-label {
  display: block;
  margin-top: 0.5rem;
  color: var(--stats-label);
  font-size: var(--fs-small);
  font-weight: 500;
}

/* — Closing CTA — */
.closing-cta {
  text-align: center;
}

.closing-cta .wrap { width: min(640px, 100% - 3rem); }
.closing-cta h2 { margin-bottom: 0.75rem; }
.closing-cta p { color: var(--text-secondary); margin-bottom: 2rem; }
.closing-cta .hero-actions { margin-bottom: 0; }

/* — Footer — */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 2.5rem;
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: var(--fs-small);
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links a { text-decoration: none; color: var(--text-secondary); }
.footer-links a:hover { color: var(--text); }

/* — Kassenbon-Upload-Seite — */
.upload-page-header {
  text-align: center;
  padding-block: clamp(2.5rem, 2rem + 2vw, 4rem) 2.5rem;
}

.upload-page-header .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: var(--fs-eyebrow);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-strong);
  background: var(--accent-soft);
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
}

.upload-page-header p { color: var(--text-secondary); margin-top: 0.75rem; }

.upload-shell {
  width: min(640px, 100% - 3rem);
  margin-inline: auto;
  padding-bottom: var(--space-section);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  padding: clamp(1.5rem, 1.3rem + 1vw, 2.25rem);
}

.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius-m);
  padding: clamp(2rem, 1.6rem + 2vw, 3.5rem) 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
.dropzone:hover, .dropzone.is-dragover { border-color: var(--accent); background: var(--accent-soft); }

.dropzone .icon-badge {
  width: 56px;
  height: 56px;
  margin-inline: auto;
  margin-bottom: 1rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-strong);
}
.dropzone .icon-badge .icon { width: 26px; height: 26px; }

.dropzone p { color: var(--text-secondary); font-size: var(--fs-small); margin-top: 0.4rem; }
.dropzone strong { color: var(--text); }

.upload-preview {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-align: left;
}

.upload-preview img {
  width: 72px;
  height: 72px;
  object-fit: cover;
  border-radius: var(--radius-s);
  border: 1px solid var(--border);
}

.upload-preview .file-meta { flex: 1; min-width: 0; }
.upload-preview .file-name { font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.upload-preview .file-size { color: var(--text-secondary); font-size: var(--fs-small); }

.status-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-secondary);
  font-size: var(--fs-small);
}

.spinner {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  border-top-color: var(--accent);
  flex-shrink: 0;
}
@media (prefers-reduced-motion: no-preference) {
  .spinner { animation: spin 0.7s linear infinite; }
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.1rem;
}

.field label {
  font-size: var(--fs-small);
  font-weight: 700;
}

.field input {
  font: inherit;
  padding: 0.65rem 0.8rem;
  border-radius: var(--radius-s);
  border: 1px solid var(--border-strong);
  background: var(--bg);
  color: var(--text);
}
.field input:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 1px; }

.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
@media (max-width: 480px) { .field-row { grid-template-columns: 1fr; } }

.item-list { display: flex; flex-direction: column; gap: 0.6rem; margin-bottom: 1.25rem; }

.item-row {
  display: grid;
  grid-template-columns: 1fr 6.5rem auto;
  gap: 0.5rem;
  align-items: center;
}

.item-row input { font: inherit; padding: 0.55rem 0.7rem; border-radius: var(--radius-s); border: 1px solid var(--border-strong); background: var(--bg); color: var(--text); }
.item-row input:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 1px; }
.item-row .price-input { text-align: right; font-variant-numeric: tabular-nums; }

.item-remove {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-s);
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
}
.item-remove:hover { border-color: var(--danger); color: var(--danger); }
.item-remove .icon { width: 16px; height: 16px; }

.add-item-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: none;
  border: none;
  color: var(--accent-strong);
  font-weight: 700;
  font-size: var(--fs-small);
  cursor: pointer;
  padding: 0.4rem 0;
  margin-bottom: 1.5rem;
}
.add-item-btn .icon { width: 16px; height: 16px; }

.confirm-actions { display: flex; gap: 0.75rem; }
.confirm-actions .btn { flex: 1; }

.alert {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-s);
  background: var(--danger-soft);
  color: var(--danger);
  font-size: var(--fs-small);
  margin-bottom: 1.25rem;
}
.alert .icon { width: 18px; height: 18px; flex-shrink: 0; margin-top: 0.1rem; }

.success-state { text-align: center; padding-block: 1rem; }
.success-state .icon-badge {
  width: 64px; height: 64px; margin-inline: auto; margin-bottom: 1.25rem;
  display: grid; place-items: center; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent-strong);
}
.success-state .icon-badge .icon { width: 30px; height: 30px; }
.success-state p { color: var(--text-secondary); margin-top: 0.5rem; }

[hidden] { display: none !important; }