/* === Variablen (Dark/Light Mode) === */
:root {
  /* Farben - Light Mode (Default) */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8f9fa;
  --color-bg-tertiary: #e9ecef;
  --color-bg-elevated: rgba(255, 255, 255, 0.8);

  --color-text-primary: #212529;
  --color-text-secondary: #495057;
  --color-text-muted: #6c757d;

  --color-primary: #0d6efd;
  --color-primary-hover: #0b5ed7;
  --color-primary-light: #e7f1ff;

  --color-success: #198754;
  --color-success-light: #d1e7dd;

  --color-warning: #ffc107;
  --color-warning-light: #fff3cd;

  --color-error: #dc3545;
  --color-error-light: #f8d7da;

  --color-border: #dee2e6;
  --color-border-focus: #0d6efd;

  --color-card-bg: #ffffff;
  --color-card-shadow: rgba(0, 0, 0, 0.1);

  --color-nav-bg: #ffffff;
  --color-nav-text: #212529;
  --color-nav-hover: #f8f9fa;

  --color-input-bg: #ffffff;
  --color-input-border: #ced4da;
  --color-input-focus: #0d6efd;

  --color-cta-bg: #1e88e5;
  --color-cta-text: #ffffff;

  --color-cta-secondary-bg: #6c757d;

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);

  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  --font-family-base:
    "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial,
    sans-serif;
  --font-family-mono: "Consolas", "Monaco", "Courier New", monospace;

  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;

  /* Grid */
  --grid-container: 1200px;
}

[data-theme="dark"] {
  /* Farben - Dark Mode */
  --color-bg-primary: #1a1a2e;
  --color-bg-secondary: #16213e;
  --color-bg-tertiary: #0f3460;
  --color-bg-elevated: rgba(26, 26, 46, 0.8);

  --color-text-primary: #e4e6eb;
  --color-text-secondary: #b8bcc8;
  --color-text-muted: #8b949e;

  --color-primary: #4dabf7;
  --color-primary-hover: #74c0fc;
  --color-primary-light: rgba(77, 171, 247, 0.2);

  --color-success: #569d55;
  --color-success-light: rgba(86, 157, 85, 0.2);

  --color-warning: #eacc6d;
  --color-warning-light: rgba(234, 204, 109, 0.2);

  --color-error: #f15796;
  --color-error-light: rgba(241, 87, 150, 0.2);

  --color-border: #30363d;
  --color-border-focus: #4dabf7;

  --color-card-bg: #1f2431;
  --color-card-shadow: rgba(0, 0, 0, 0.3);

  --color-nav-bg: #16213e;
  --color-nav-text: #e4e6eb;
  --color-nav-hover: #0f3460;

  --color-input-bg: #1f2431;
  --color-input-border: #414854;
  --color-input-focus: #4dabf7;

  --color-cta-bg: #64b5f6;
  --color-cta-text: #1a1a2e;

  --color-cta-secondary-bg: #5c6370;

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
}

/* === Base Styles === */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  min-height: 100vh;
  transition:
    background-color var(--transition-normal),
    color var(--transition-normal);
}

/* === Typografie === */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

h1 {
  font-size: 2.5rem;
}
h2 {
  font-size: 2rem;
}
h3 {
  font-size: 1.5rem;
}
h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
}

/* === Container === */
.container {
  width: 100%;
  max-width: var(--grid-container);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.25;
  text-align: center;
  white-space: nowrap;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

.btn-primary {
  background-color: var(--color-cta-bg);
  color: var(--color-cta-text);
}

.btn-primary:hover {
  background-color: #156fc1;
}

.btn-secondary {
  background-color: var(--color-cta-secondary-bg);
  color: var(--color-cta-text);
}

.btn-secondary:hover {
  background-color: #5a626f;
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

.btn-block {
  width: 100%;
}

/* === Navigation === */
.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--color-nav-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--grid-container);
  margin: 0 auto;
  padding: 0.75rem var(--spacing-lg);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
  z-index: 1001;
}

.nav-logo:hover {
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.9375rem;
  color: var(--color-nav-text);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  background-color: var(--color-nav-hover);
  color: var(--color-primary);
}

.nav-link.active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 500;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background-color: transparent;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: 1.25rem;
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--color-bg-tertiary);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

/* === Main Content === */
.main-content {
  padding-top: 70px;
  min-height: 100vh;
}

/* === Hero Section === */
.hero-section {
  background: linear-gradient(135deg, var(--color-cta-bg) 0%, #156fc1 100%);
  color: var(--color-cta-text);
  padding: 4rem var(--spacing-lg);
  text-align: center;
}

.hero-container {
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-cta-text);
}

.hero-description {
  font-size: 1.125rem;
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* === Section Styles === */
.section-title {
  text-align: center;
  margin-bottom: 2rem;
  color: var(--color-text-primary);
}

/* === Features Grid === */
.features-section {
  padding: 3rem var(--spacing-lg);
  background-color: var(--color-bg-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  max-width: var(--grid-container);
  margin: 0 auto;
}

.feature-card {
  background-color: var(--color-card-bg);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  border: 1px solid var(--color-border);
}

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

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.feature-card p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* === Quick Start === */
.quick-start {
  padding: 3rem var(--spacing-lg);
  background-color: var(--color-bg-primary);
}

.quick-start-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  max-width: var(--grid-container);
  margin: 0 auto;
}

.quick-card {
  background-color: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  border-left: 4px solid var(--color-primary);
  transition: all var(--transition-normal);
}

.quick-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.quick-card h3 {
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.quick-card p {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* === Bottom Navigation (Mobile) === */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--color-nav-bg);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.nav-container-mobile {
  display: flex;
  justify-content: space-around;
  padding: 0.5rem var(--spacing-md);
  max-width: none;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  flex: 1;
  padding: 0.5rem 0.75rem;
  font-size: 0.75rem;
  color: var(--color-nav-text);
  transition: all var(--transition-fast);
}

.nav-item svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  fill: none;
}

.nav-item:hover {
  background-color: var(--color-nav-hover);
  color: var(--color-primary);
}

.nav-item.active {
  color: var(--color-primary);
  font-weight: 500;
}

/* === Footer === */
.main-footer {
  padding: 2rem var(--spacing-lg);
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

.footer-container {
  max-width: var(--grid-container);
  margin: 0 auto;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* === Responsive Design === */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-description {
    font-size: 1rem;
  }

  .features-grid,
  .quick-start-grid {
    grid-template-columns: 1fr;
  }

  .nav-links {
    display: none;
  }

  .hero-section {
    padding: 3rem var(--spacing-md);
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn-large {
    width: 100%;
    max-width: 300px;
  }
}

/* === Verfeinerte Formularfelder & Footer === */
[data-theme="dark"] {
  --color-primary: #35d39a;
  --color-primary-hover: #54dfad;
  --color-primary-light: rgba(53, 211, 154, .14);
  --color-border-focus: #35d39a;
  --color-input-focus: #35d39a;
  --color-cta-bg: #22b982;
  --color-cta-text: #071f17;
}

.btn-primary:hover {
  color: #fff;
  background: #076c4e;
}

[data-theme="dark"] .btn-primary:hover {
  color: #061c15;
  background: #56dfae;
}

select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 3rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' viewBox='0 0 24 24' fill='none' stroke='%23087f5b' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m7 10 5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .9rem center;
  cursor: pointer;
}

[data-theme="dark"] select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' viewBox='0 0 24 24' fill='none' stroke='%2335d39a' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m7 10 5 5 5-5'/%3E%3C/svg%3E");
}

input[type="number"] {
  appearance: textfield;
  -moz-appearance: textfield;
  padding-right: 2.7rem;
}

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

.number-field {
  position: relative;
  display: flex;
  flex: 1 1 auto;
  min-width: 0;
}

.number-field > input {
  flex: 1 1 auto;
  min-width: 0;
}

.number-controls {
  position: absolute;
  top: 1px;
  right: 1px;
  bottom: 1px;
  display: grid;
  width: 2.25rem;
  overflow: hidden;
  border-left: 1px solid var(--color-border);
  border-radius: 0 calc(var(--radius-md) - 1px) calc(var(--radius-md) - 1px) 0;
}

.number-controls button {
  display: grid;
  place-items: center;
  padding: 0;
  color: var(--color-text-muted);
  background: color-mix(in srgb, var(--color-bg-secondary) 72%, transparent);
  border: 0;
  cursor: pointer;
  transition: color .15s ease, background-color .15s ease;
}

.number-controls button + button {
  border-top: 1px solid var(--color-border);
}

.number-controls button:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.number-controls button:focus-visible {
  position: relative;
  z-index: 1;
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}

.number-controls svg {
  width: 11px;
  height: 7px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.field-unit .number-field input {
  border: 0;
  border-radius: 0;
}

.input-group > .number-field:first-child input {
  border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.main-footer {
  position: relative;
  padding: 1.5rem var(--spacing-lg);
  color: var(--color-text-secondary);
  background: var(--color-card-bg);
  border-top: 1px solid color-mix(in srgb, var(--color-primary) 15%, var(--color-border));
}

.footer-container p {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: .65rem;
  margin: 0;
}

.footer-container strong {
  color: var(--color-primary);
  font-size: .95rem;
  letter-spacing: -.02em;
}

.footer-container span {
  color: var(--color-text-muted);
  font-size: .82rem;
}

.footer-credit {
  display: inline-flex;
  align-items: center;
  gap: .32rem;
  padding-left: .65rem;
  border-left: 1px solid var(--color-border);
}

.footer-heart {
  width: .9rem;
  height: .9rem;
  color: #e05263;
  fill: currentColor;
  filter: drop-shadow(0 2px 4px rgba(224, 82, 99, .18));
}

@media (max-width: 768px) {
  .input-group > .number-field:first-child input {
    border-radius: var(--radius-md);
  }

  .footer-container p {
    flex-direction: column;
    gap: .2rem;
  }

  .footer-credit {
    padding-left: 0;
    border-left: 0;
  }
}

[data-theme="light"] {
  color-scheme: light;
}

/* === Stromklar 2.0 === */
:root {
  --ink: #13231e;
  --mint: #15b77e;
  --mint-dark: #087454;
  --mint-soft: #eaf9f3;
}

svg { display: block; }
.logo-mark { width: 2.25rem; height: 2.25rem; display: grid; place-items: center; border-radius: .72rem; background: var(--mint); color: #fff; box-shadow: 0 6px 18px rgba(21,183,126,.26); }
.logo-mark svg { width: 1.25rem; fill: currentColor; }
.nav-logo { font-weight: 760; letter-spacing: -.025em; }
.nav-actions { display: flex; align-items: center; gap: .65rem; }
.nav-cta { padding: .65rem 1rem; border-radius: .7rem; }
.theme-icon svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.nav-links a:not(.nav-link) { display: flex; padding: .5rem .75rem; color: var(--color-nav-text); font-weight: 600; border-radius: var(--radius-full); }
.landing-page { overflow: hidden; }
.landing-shell, .calculator-shell { width: min(1120px, calc(100% - 3rem)); margin-inline: auto; }
.landing-hero { position: relative; padding: clamp(5rem, 11vw, 9rem) 0 clamp(5rem, 9vw, 7rem); background: linear-gradient(180deg, #f7fcfa 0%, #fff 100%); }
.landing-hero::before { content: ""; position: absolute; width: 34rem; height: 34rem; right: -8rem; top: -9rem; border-radius: 50%; background: radial-gradient(circle, rgba(21,183,126,.14), rgba(21,183,126,0) 68%); }
[data-theme="dark"] .landing-hero { background: linear-gradient(180deg, #14251f 0%, var(--color-bg-primary) 100%); }
.landing-hero-grid { position: relative; display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(360px, .82fr); align-items: center; gap: clamp(3rem, 8vw, 7rem); }
.hero-copy { text-align: left; }
.hero-kicker, .section-kicker { display: inline-flex; align-items: center; gap: .55rem; color: var(--mint-dark); text-transform: uppercase; letter-spacing: .13em; font-size: .75rem; font-weight: 800; }
.hero-kicker > span { width: 1.5rem; height: 2px; background: var(--mint); }
.hero-copy h1 { max-width: 700px; margin: 1.25rem 0 1.5rem; font-size: clamp(3rem, 6.8vw, 5.8rem); line-height: .98; letter-spacing: -.065em; font-weight: 780; }
.hero-copy h1 em { color: var(--mint); font-style: normal; }
.hero-copy > p { max-width: 600px; color: var(--color-text-secondary); font-size: clamp(1.05rem, 2vw, 1.22rem); line-height: 1.75; }
.landing-buttons { justify-content: flex-start; align-items: center; margin: 2rem 0; }
.landing-buttons .btn { border-radius: .8rem; box-shadow: 0 12px 28px rgba(8,127,91,.2); }
.btn svg, .text-link svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.text-link { font-weight: 700; color: var(--color-text-primary); padding: .75rem; }
.trust-row { display: flex; flex-wrap: wrap; gap: 1.25rem; padding-top: .5rem; color: var(--color-text-secondary); font-size: .86rem; }
.trust-row span { display: flex; align-items: center; gap: .4rem; }
.trust-row svg { width: 16px; height: 16px; fill: none; stroke: var(--mint); stroke-width: 2.5; }
.hero-preview { position: relative; padding: 2rem; color: #17342b; background: rgba(255,255,255,.94); border: 1px solid rgba(21,183,126,.17); border-radius: 1.4rem; box-shadow: 0 32px 80px rgba(20,70,54,.16); transform: rotate(1deg); }
.hero-preview::before { content: ""; position: absolute; inset: 12px -14px -14px 12px; z-index: -1; background: var(--mint-soft); border-radius: inherit; }
.preview-top, .result-kicker { display: flex; justify-content: space-between; align-items: center; gap: 1rem; color: #6a7c75; font-size: .85rem; }
.status-dot, .live-pill { padding: .34rem .6rem; color: #087454; background: #e4f8f0; border-radius: 999px; font-size: .72rem; font-weight: 750; }
.status-dot::before, .live-pill i { content: ""; display: inline-block; width: 6px; height: 6px; margin-right: .35rem; border-radius: 50%; background: #15b77e; }
.preview-price { display: block; margin-top: 1.5rem; font-size: clamp(2.8rem, 6vw, 4.25rem); letter-spacing: -.055em; }
.preview-caption { color: #7d8c87; font-size: .82rem; }
.mini-chart { height: 118px; display: flex; align-items: end; gap: 8px; margin: 1.5rem 0; padding-top: 1rem; border-bottom: 1px solid #e2ebe7; }
.mini-chart i { flex: 1; border-radius: 5px 5px 0 0; background: linear-gradient(#31ca94, #0d9167); opacity: .85; }
.preview-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.preview-detail > span { display: flex; align-items: center; gap: .7rem; }
.preview-detail span span { display: grid; color: #7d8c87; font-size: .72rem; }
.preview-detail small { color: #17342b; font-size: .9rem; font-weight: 750; }
.icon-box, .line-icon { flex: 0 0 auto; width: 2.6rem; height: 2.6rem; display: grid; place-items: center; color: var(--mint-dark); background: var(--mint-soft); border-radius: .7rem; }
.icon-box svg, .line-icon svg, .result-note svg, .result-icon svg, .summary-icon svg, .empty-icon svg { width: 1.35rem; height: 1.35rem; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.landing-section { padding: clamp(5rem, 9vw, 8rem) 0; }
.section-heading { max-width: 650px; margin: 0 auto 3.5rem; text-align: center; }
.section-heading h2, .landing-cta h2 { margin: .7rem 0 1rem; font-size: clamp(2.25rem, 5vw, 3.6rem); letter-spacing: -.05em; }
.section-heading p { color: var(--color-text-secondary); }
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; }
.step-card { position: relative; padding: 2rem; background: var(--color-card-bg); border: 1px solid var(--color-border); border-radius: 1.15rem; transition: transform .2s ease, box-shadow .2s ease; }
.step-card:hover { transform: translateY(-5px); box-shadow: 0 20px 45px rgba(19,54,45,.1); }
.step-number { position: absolute; right: 1.5rem; top: 1.25rem; color: color-mix(in srgb, var(--color-text-muted) 25%, transparent); font-size: 2.3rem; font-weight: 800; }
.step-card .line-icon { margin-bottom: 1.5rem; }
.step-card h3 { font-size: 1.2rem; }
.step-card p { color: var(--color-text-secondary); margin: 0; }
.landing-cta { padding: 5rem 0; color: #fff; background: #073f31; }
.cta-inner { display: flex; justify-content: space-between; align-items: center; gap: 3rem; }
.landing-cta .section-kicker { color: #62dfb1; }
.landing-cta p { color: rgba(255,255,255,.7); margin: 0; }
.btn-light { color: #073f31; background: #fff; border-radius: .8rem; }

/* Rechner */
.calculator-page { min-height: 100vh; padding: clamp(4rem, 8vw, 7rem) 0; background: linear-gradient(180deg, var(--mint-soft), var(--color-bg-primary) 42%); }
[data-theme="dark"] .calculator-page { background: linear-gradient(180deg, #123228, var(--color-bg-primary) 42%); }
.calculator-heading { max-width: 650px; margin: 0 auto 3rem; text-align: center; }
.calculator-heading h1 { margin: .7rem 0; font-size: clamp(2.5rem, 6vw, 4rem); letter-spacing: -.055em; }
.calculator-heading p { color: var(--color-text-secondary); }
.calculator-layout { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(340px, .92fr); gap: 1.25rem; align-items: stretch; }
.calculator-form, .calculator-result { padding: clamp(1.5rem, 4vw, 2.5rem); border-radius: 1.25rem; }
.calculator-form { display: grid; gap: 1.35rem; background: var(--color-card-bg); border: 1px solid var(--color-border); box-shadow: 0 16px 50px rgba(19,54,45,.08); }
.form-title { display: flex; gap: 1rem; align-items: center; padding-bottom: 1rem; border-bottom: 1px solid var(--color-border); }
.form-title h2 { font-size: 1.25rem; margin: 0 0 .15rem; }
.form-title p { color: var(--color-text-muted); margin: 0; font-size: .85rem; }
.calc-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.field-unit { display: flex; align-items: center; border: 1px solid var(--color-input-border); border-radius: .65rem; background: var(--color-input-bg); overflow: hidden; }
.field-unit:focus-within { border-color: var(--mint); box-shadow: 0 0 0 3px rgba(21,183,126,.14); }
.field-unit input { border: 0; border-radius: 0; box-shadow: none; outline: 0; }
.field-unit span { padding: 0 1rem; color: var(--color-text-muted); white-space: nowrap; border-left: 1px solid var(--color-border); }
.save-hint { display: flex; align-items: center; gap: .5rem; color: var(--mint-dark); font-size: .9rem; font-weight: 700; }
.save-hint svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; }
.calculator-result { color: #fff; background: linear-gradient(145deg, #0c7958, #07513d); box-shadow: 0 20px 55px rgba(7,81,61,.22); }
.calculator-result .result-kicker { color: rgba(255,255,255,.68); }
.result-device { margin: 1.2rem 0 .25rem; color: rgba(255,255,255,.65); }
.primary-result { padding-bottom: 2rem; border-bottom: 1px solid rgba(255,255,255,.15); }
.primary-result span { display: block; color: rgba(255,255,255,.62); font-size: .8rem; }
.primary-result strong { display: block; margin-top: .2rem; font-size: clamp(3rem, 7vw, 4.8rem); line-height: 1; letter-spacing: -.06em; }
.primary-result small { display: flex; gap: .35rem; margin-top: .7rem; color: rgba(255,255,255,.62); font-size: .8rem; }
.primary-result small span { color: #fff; font-weight: 750; }
.calculator-save { width: 100%; margin-top: .25rem; }
.result-comparison { margin-top: 1rem; border: 1px solid rgba(255,255,255,.14); border-radius: .8rem; overflow: hidden; }
.result-comparison > div { display: grid; grid-template-columns: .7fr 1fr 1fr; gap: .75rem; align-items: center; padding: .72rem .85rem; border-bottom: 1px solid rgba(255,255,255,.1); }
.result-comparison > div:last-child { border-bottom: 0; }
.result-comparison .comparison-head { color: rgba(255,255,255,.52); background: rgba(0,0,0,.08); font-size: .68rem; text-transform: uppercase; letter-spacing: .07em; }
.result-comparison .comparison-head span:not(:first-child), .result-comparison > div > span:not(:first-child) { text-align: right; }
.result-comparison > div > strong { font-size: .85rem; }
.result-comparison > div > span { color: rgba(255,255,255,.76); font-size: .82rem; }
.result-comparison .is-highlighted { background: rgba(255,255,255,.08); }
.result-comparison .is-highlighted strong, .result-comparison .is-highlighted span { color: #fff; }
.result-list { display: grid; gap: 0; }
.result-list > div { display: flex; justify-content: space-between; gap: 1rem; padding: 1.15rem 0; border-bottom: 1px solid rgba(255,255,255,.12); }
.result-list span { color: rgba(255,255,255,.66); }
.result-note { display: flex; align-items: center; gap: .8rem; margin-top: 1.5rem; padding: 1rem; background: rgba(255,255,255,.08); border-radius: .8rem; }
.result-note svg { flex: 0 0 auto; }
.result-note p { display: grid; margin: 0; }
.result-note span { color: rgba(255,255,255,.62); font-size: .78rem; }
.result-icon, .summary-icon, .empty-icon { width: 2.8rem; height: 2.8rem; display: grid; place-items: center; color: var(--mint-dark); background: var(--mint-soft); border-radius: .75rem; }

@media (max-width: 900px) {
  .landing-hero-grid, .calculator-layout { grid-template-columns: 1fr; }
  .hero-copy { text-align: center; }
  .hero-copy > p { margin-inline: auto; }
  .landing-buttons, .trust-row { justify-content: center; }
  .hero-preview { max-width: 520px; margin-inline: auto; transform: none; }
  .steps-grid { grid-template-columns: 1fr; }
  .cta-inner { flex-direction: column; text-align: center; }
}
@media (max-width: 768px) {
  .nav-cta { display: none; }
  .landing-shell, .calculator-shell { width: min(100% - 2rem, 1120px); }
  .landing-hero { padding-top: 4rem; }
  .hero-copy h1 { font-size: clamp(2.75rem, 14vw, 4.2rem); }
  .landing-buttons { align-items: stretch; }
  .landing-buttons .text-link { text-align: center; }
  .trust-row { gap: .7rem 1rem; }
  .hero-preview { padding: 1.4rem; }
  .calc-row { grid-template-columns: 1fr; }
  .primary-result strong { font-size: 3.4rem; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* === Accessibility === */
@media (prefers-contrast: high) {
  :root {
    --color-border: #000000;
    --color-text-primary: #000000;
    --color-text-secondary: #333333;
    --color-bg-secondary: #f0f0f0;
  }

  .feature-card,
  .quick-card {
    border-width: 2px;
    border-style: solid;
  }
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg-primary: #1a1a2e;
    --color-bg-secondary: #16213e;
    --color-text-primary: #e4e6eb;
    --color-text-secondary: #b8bcc8;
    --color-nav-bg: #16213e;
    --color-nav-text: #e4e6eb;
    --color-card-bg: #1f2431;
    --color-input-bg: #1f2431;
    --color-input-border: #414854;
    --color-border: #30363d;
  }
}

/* === Focus States === */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* === Print Styles === */
@media print {
  .main-nav,
  .bottom-nav,
  .hero-section,
  .features-section,
  .quick-start,
  .main-footer {
    display: none;
  }

  body {
    color: #000;
    background: #fff;
  }
}

/* === App-Oberfläche === */
:root {
  --color-primary: #087f5b;
  --color-primary-hover: #066649;
  --color-primary-light: #e6fcf5;
  --color-cta-bg: #087f5b;
  --color-border-focus: #087f5b;
  --grid-container: 1120px;
}

body {
  background:
    radial-gradient(circle at 10% 0%, rgba(18, 184, 134, 0.08), transparent 28rem),
    var(--color-bg-primary);
}

.nav-icon { width: 28px; height: 28px; color: #12b886; }
.main-nav { backdrop-filter: blur(16px); background: var(--color-bg-elevated); }
.nav-container { min-height: 68px; }
.nav-link { font-weight: 600; border-radius: var(--radius-full); }

.hero-section {
  position: relative;
  overflow: hidden;
  padding: clamp(5rem, 10vw, 8rem) var(--spacing-lg);
  background: linear-gradient(135deg, #063d32 0%, #087f5b 55%, #20c997 140%);
}
.hero-section::after {
  content: ""; position: absolute; width: 32rem; height: 32rem; border-radius: 50%;
  right: -12rem; top: -17rem; border: 1px solid rgba(255,255,255,.2);
  box-shadow: 0 0 0 5rem rgba(255,255,255,.035), 0 0 0 10rem rgba(255,255,255,.025);
}
.hero-container { position: relative; z-index: 1; }
.hero-title { font-size: clamp(2.5rem, 6vw, 4.75rem); letter-spacing: -.055em; line-height: 1.02; }
.hero-description { max-width: 670px; margin: 1.5rem auto 2.25rem; color: rgba(255,255,255,.84); }
.hero-buttons .btn-primary { background: #fff; color: #075f46; }
.hero-buttons .btn-secondary { background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.35); }
.hero-buttons .btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

.features-section, .quick-start { padding-block: clamp(4rem, 8vw, 6.5rem); }
.feature-card, .quick-card, .form-card, .result-card, .summary-card, .info-card, .device-card {
  box-shadow: 0 12px 36px rgba(19, 54, 45, .07);
}
.feature-card { padding: 2rem; }
.feature-icon { width: 3.25rem; height: 3.25rem; display: grid; place-items: center; background: var(--color-primary-light); border-radius: 1rem; font-size: 1.5rem; }

.dashboard-header, .devices-header, .settings-header { padding: 4.5rem 0 2rem; }
.page-title { font-size: clamp(2.25rem, 5vw, 3.5rem); letter-spacing: -.045em; margin-bottom: .5rem; }
.page-description { color: var(--color-text-secondary); font-size: 1.1rem; }
.results-section, .settings-section, .devices-list-section, .add-device-section, .summary-section, .cta-section { margin-bottom: 3rem; }
.results-grid, .summary-cards, .devices-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; }
.result-card, .summary-card, .form-card, .info-card, .device-card { background: var(--color-card-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 1.5rem; }
.result-card#totalResult { border-color: #20c997; background: linear-gradient(145deg, var(--color-card-bg), var(--color-primary-light)); margin-bottom: 1rem; }
.result-header, .detail-item, .device-header, .device-cost { display: flex; justify-content: space-between; gap: 1rem; align-items: center; }
.value-label, .detail-label, .summary-label, .device-metrics span, .device-cost span { color: var(--color-text-muted); font-size: .875rem; }
.value-amount { display: block; font-size: clamp(2rem, 5vw, 3rem); font-weight: 750; letter-spacing: -.04em; color: var(--color-primary); }
.result-details { display: grid; gap: .6rem; border-top: 1px solid var(--color-border); padding-top: 1rem; margin-top: 1rem; }
.summary-card { display: flex; align-items: center; gap: 1rem; }
.summary-icon { font-size: 1.75rem; }
.summary-content { display: grid; }
.summary-value { font-size: 1.25rem; font-weight: 700; }

.form-card { max-width: 760px; margin-inline: auto; }
.device-form, .settings-form { display: grid; gap: 1.25rem; }
.form-group { display: grid; gap: .5rem; }
.form-group label { font-weight: 650; }
.input-group { display: grid; grid-template-columns: 1fr auto; }
input, select, textarea { width: 100%; padding: .85rem 1rem; color: var(--color-text-primary); background: var(--color-input-bg); border: 1px solid var(--color-input-border); border-radius: var(--radius-md); font: inherit; }
.input-group input { border-radius: var(--radius-md) 0 0 var(--radius-md); }
.input-group select { width: auto; border-left: 0; border-radius: 0 var(--radius-md) var(--radius-md) 0; }
input:focus, select:focus, textarea:focus { outline: 3px solid color-mix(in srgb, var(--color-primary) 20%, transparent); border-color: var(--color-primary); }
.form-actions { display: flex; align-items: center; flex-wrap: wrap; gap: .75rem; margin-top: .5rem; }
.help-text, .danger-text { color: var(--color-text-muted); font-size: .875rem; }
.btn-danger { background: transparent; color: var(--color-error); border: 1px solid color-mix(in srgb, var(--color-error) 35%, transparent); }
.btn-danger:hover { background: var(--color-error-light); }
.btn-sm { padding: .5rem .8rem; font-size: .875rem; }

.device-card { display: grid; gap: 1.25rem; }
.devices-section-head { display: flex; justify-content: space-between; align-items: end; gap: 1.5rem; margin-bottom: 1.5rem; }
.devices-section-head h2 { margin: .35rem 0 0; font-size: clamp(1.65rem, 3vw, 2.15rem); letter-spacing: -.035em; }
.period-switch { display: inline-grid; grid-template-columns: repeat(4, 1fr); padding: .3rem; background: var(--color-bg-secondary); border: 1px solid var(--color-border); border-radius: .8rem; }
.period-switch button { min-width: 4.6rem; padding: .55rem .75rem; color: var(--color-text-secondary); background: transparent; border: 0; border-radius: .55rem; font: inherit; font-size: .84rem; font-weight: 650; cursor: pointer; transition: color .15s ease, background-color .15s ease, box-shadow .15s ease; }
.period-switch button:hover { color: var(--color-primary); }
.period-switch button.active { color: #fff; background: var(--color-primary); box-shadow: 0 4px 12px color-mix(in srgb, var(--color-primary) 24%, transparent); }
[data-theme="dark"] .period-switch button.active { color: #062016; }
.device-header h3 { margin: .2rem 0 0; }
.eyebrow { font-size: .72rem; text-transform: uppercase; letter-spacing: .12em; color: var(--color-primary); font-weight: 750; }
.device-badge { padding: .35rem .65rem; background: var(--color-primary-light); color: var(--color-primary); border-radius: var(--radius-full); font-weight: 700; white-space: nowrap; }
.device-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
.device-metrics div { display: grid; gap: .2rem; }
.device-cost { padding-top: 1rem; border-top: 1px solid var(--color-border); }
.device-cost strong { font-size: 1.25rem; color: var(--color-primary); }
.device-cost small { color: var(--color-text-muted); font-weight: 500; }
.device-period-results { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--color-border); border-radius: .8rem; overflow: hidden; }
.device-period-results > div { display: grid; gap: .25rem; padding: 1rem; background: color-mix(in srgb, var(--color-primary-light) 46%, var(--color-card-bg)); }
.device-period-results > div + div { border-left: 1px solid var(--color-border); }
.device-period-results span { color: var(--color-text-muted); font-size: .76rem; }
.device-period-results strong { color: var(--color-primary); font-size: 1.15rem; letter-spacing: -.02em; }
.device-period-results small { color: var(--color-text-muted); font-size: .75rem; font-weight: 600; }
.device-card .device-metrics span,
.device-card .device-notes,
.device-period-results span,
.device-period-results small {
  color: #40574f;
}

.device-card .device-metrics strong {
  color: #172e26;
  font-weight: 750;
}

.device-period-results > div {
  background: #eef6f2;
}

.device-period-results strong {
  color: #066347;
  font-weight: 800;
}

[data-theme="dark"] .device-card .device-metrics span,
[data-theme="dark"] .device-card .device-notes,
[data-theme="dark"] .device-period-results span,
[data-theme="dark"] .device-period-results small {
  color: #b9cbc4;
}

[data-theme="dark"] .device-card .device-metrics strong {
  color: #f0f7f4;
}

[data-theme="dark"] .device-period-results > div {
  background: #243c34;
}

[data-theme="dark"] .device-period-results strong {
  color: #62dfb1;
}
.device-notes { color: var(--color-text-secondary); margin: 0; }
.empty-state { text-align: center; padding: 4rem 1rem; border: 1px dashed var(--color-border); border-radius: var(--radius-lg); }
.empty-icon { font-size: 2.5rem; color: var(--color-primary); }
.empty-state .empty-icon { margin-inline: auto; }
.settings-row { display: grid; gap: 1rem; }
.setting-item, .info-row { display: flex; justify-content: space-between; gap: 2rem; padding-bottom: 1rem; border-bottom: 1px solid var(--color-border); }
.setting-label, .info-label { font-weight: 700; }
.setting-description, .setting-value { color: var(--color-text-secondary); }

@media (min-width: 769px) { .bottom-nav { display: none; } }
@media (max-width: 768px) {
  body { padding-bottom: 68px; }
  .main-footer { margin-bottom: 0; }
  .nav-text { font-size: 1rem; }
  .dashboard-header, .devices-header, .settings-header { padding-top: 3rem; }
  .container { padding-inline: 1rem; }
  .input-group { grid-template-columns: 1fr; }
  .input-group input, .input-group select { border: 1px solid var(--color-input-border); border-radius: var(--radius-md); width: 100%; }
  .form-actions .btn { width: 100%; }
  .setting-item, .info-row { flex-direction: column; gap: .25rem; }
  .nav-item { min-width: 0; padding-inline: .2rem; }
  .devices-section-head { align-items: stretch; flex-direction: column; }
  .period-switch { width: 100%; }
  .period-switch button { min-width: 0; padding-inline: .35rem; }
  .device-period-results { grid-template-columns: 1fr; }
  .device-period-results > div + div { border-left: 0; border-top: 1px solid var(--color-border); }
}

/* Abschließende Formular-Overrides */
select {
  appearance: none;
  -webkit-appearance: none;
  padding-right: 3rem;
  background-color: var(--color-input-bg);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' viewBox='0 0 24 24' fill='none' stroke='%23087f5b' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m7 10 5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .9rem center;
  cursor: pointer;
}

[data-theme="dark"] select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' viewBox='0 0 24 24' fill='none' stroke='%2335d39a' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m7 10 5 5 5-5'/%3E%3C/svg%3E");
}

.field-unit > .number-field,
.field-unit > .number-field > .number-controls,
.field-unit > .number-field > .number-controls button {
  padding: 0;
  border-left: 0;
}

.field-unit > .number-field > .number-controls {
  border-left: 1px solid var(--color-border);
}

.field-unit > .number-field > .number-controls button + button {
  border-top: 1px solid var(--color-border);
}

@media (max-width: 768px) {
  .input-group select { padding-right: 3rem; }
}

/* Eigenes Bestätigungsfenster */
body.modal-open { overflow: hidden; }

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(5, 20, 15, .56);
  backdrop-filter: blur(5px);
  opacity: 0;
  transition: opacity .16s ease;
}

.modal-overlay.is-visible { opacity: 1; }
.modal-overlay.is-closing { opacity: 0; }

.confirm-modal {
  width: min(100%, 440px);
  padding: 1.75rem;
  color: var(--color-text-primary);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 1.15rem;
  box-shadow: 0 28px 80px rgba(0, 0, 0, .28);
  transform: translateY(12px) scale(.98);
  transition: transform .18s ease;
}

.modal-overlay.is-visible .confirm-modal { transform: translateY(0) scale(1); }

.confirm-modal-icon {
  width: 3rem;
  height: 3rem;
  display: grid;
  place-items: center;
  margin-bottom: 1.1rem;
  color: #c83c3c;
  background: color-mix(in srgb, #dc3545 12%, var(--color-card-bg));
  border-radius: .85rem;
}

.confirm-modal-icon svg {
  width: 1.45rem;
  height: 1.45rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.confirm-modal-copy h2 { margin: 0 0 .55rem; font-size: 1.35rem; letter-spacing: -.025em; }
.confirm-modal-copy p { margin: 0; color: var(--color-text-secondary); line-height: 1.65; }
.confirm-modal-actions { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; margin-top: 1.6rem; }
.confirm-modal-actions .btn { width: 100%; padding: .8rem 1rem; }
.modal-cancel { color: var(--color-text-primary); background: var(--color-bg-secondary); border: 1px solid var(--color-border); }
.modal-cancel:hover { color: var(--color-primary); background: var(--color-primary-light); }
.modal-confirm { color: #fff; background: #c83c3c; }
.modal-confirm:hover { color: #fff; background: #a92f2f; }

@media (max-width: 430px) {
  .confirm-modal { padding: 1.35rem; }
  .confirm-modal-actions { grid-template-columns: 1fr; }
  .modal-confirm { grid-row: 1; }
}