/* ==========================================================================
   EcoNovatec GmbH – Designsystem
   Nur HTML, CSS und Vanilla JS. Keine externen Abhängigkeiten.
   ========================================================================== */

:root {
  /* Farben aus dem EcoNovatec-Logo */
  --color-primary: #005020;
  --color-primary-dark: #003816;
  --color-primary-soft: #0a6a2c;
  --color-accent: #70a000;
  --color-accent-strong: #5c8a00;
  --color-accent-soft: #eef6dc;
  --color-bg: #f5f8f1;
  --color-bg-alt: #ffffff;
  --color-surface: #ffffff;
  --color-text: #2c333c;
  --color-text-muted: #4d5560;
  --color-border: #d7e2cc;
  --color-error: #b42318;
  --color-overlay: rgba(0, 32, 16, 0.5);

  /* Typografie: Systemschriften, keine Google Fonts */
  --font-sans: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --fs-xs: 0.8125rem;
  --fs-sm: 0.9375rem;
  --fs-base: 1.0625rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.35rem;
  --fs-xl: 1.75rem;
  --fs-2xl: 2.2rem;
  --fs-3xl: 2.85rem;
  --lh-tight: 1.18;
  --lh-body: 1.65;
  --fw-regular: 400;
  --fw-medium: 600;
  --fw-bold: 700;

  /* Abstände */
  --space-xs: 0.375rem;
  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --space-lg: 2rem;
  --space-xl: 3.25rem;
  --space-2xl: 5rem;
  --space-3xl: 7rem;

  /* Layout */
  --max-width: 72rem;
  --header-height: 5.35rem;
  --radius-sm: 0.5rem;
  --radius-md: 0.9rem;
  --radius-lg: 1.25rem;
  --radius-full: 999px;

  /* Schatten */
  --shadow-sm: 0 1px 2px rgba(16, 40, 32, 0.06);
  --shadow-md: 0 10px 28px rgba(16, 40, 32, 0.08);
  --shadow-lg: 0 18px 42px rgba(16, 40, 32, 0.12);
  --shadow-header: 0 6px 18px rgba(16, 40, 32, 0.08);

  --ease: 180ms ease;
}

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

html {
  scroll-padding-top: calc(var(--header-height) + 0.75rem);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  color: var(--color-text);
  background: var(--color-bg);
}

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

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: var(--space-md);
  top: -5rem;
  z-index: 1000;
  background: var(--color-primary);
  color: #fff;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: var(--space-sm);
}

.container {
  width: min(100% - 2rem, var(--max-width));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-2xl);
}

.section--alt {
  background: var(--color-bg-alt);
}

.section--muted {
  background: #eaf3de;
}

.section__header {
  max-width: 44rem;
  margin-bottom: var(--space-xl);
}

.section__kicker {
  margin: 0 0 var(--space-sm);
  color: var(--color-primary-soft);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1, h2, h3, h4 {
  line-height: var(--lh-tight);
  color: var(--color-text);
  margin: 0 0 var(--space-md);
}

h1 { font-size: clamp(1.85rem, 4vw, var(--fs-3xl)); }
h2 { font-size: clamp(1.5rem, 3vw, var(--fs-2xl)); }
h3 { font-size: var(--fs-lg); }

p {
  margin: 0 0 var(--space-md);
  color: var(--color-text-muted);
}

.lead {
  font-size: var(--fs-md);
}

.placeholder {
  display: inline;
  background: #fff3cd;
  color: #5c4813;
  padding: 0.05em 0.35em;
  border-radius: 0.3em;
  font-weight: var(--fw-medium);
}

/* Header */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 80;
  width: 100%;
  height: 3px;
  pointer-events: none;
  background: transparent;
}

.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid transparent;
  transition: box-shadow var(--ease), border-color var(--ease), background var(--ease);
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-header);
  border-bottom-color: rgba(0, 80, 32, 0.16);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: var(--space-lg);
}

.site-logo {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
  text-decoration: none;
  max-width: min(64vw, 15.5rem);
}

.site-logo img {
  height: 72px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  object-position: left center;
  image-rendering: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__link {
  position: relative;
  color: var(--color-text);
  text-decoration: none;
  font-weight: var(--fw-medium);
  font-size: var(--fs-sm);
  padding-bottom: 0.2rem;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.15rem;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 240ms ease;
}

.nav__link[aria-current="page"] {
  color: var(--color-primary);
}

.nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: #fff;
  cursor: pointer;
  z-index: 60;
  position: relative;
}

.nav-toggle__bar {
  display: block;
  width: 1.15rem;
  height: 2px;
  margin: 5px auto;
  background: var(--color-primary);
  transition: transform var(--ease), opacity var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.9rem;
  padding: 0.7rem 1.3rem;
  border-radius: var(--radius-full);
  border: 2px solid transparent;
  font: inherit;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--ease), background-position 500ms ease, color var(--ease), border-color var(--ease), box-shadow var(--ease);
}

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

.btn--accent {
  color: var(--color-primary-dark);
  background-color: var(--color-accent);
  background-image: linear-gradient(90deg, var(--color-accent), #8cbc14, var(--color-accent));
  background-size: 180% 100%;
  background-position: 0 50%;
}

.btn--ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.6);
  color: #fff;
}

.btn--outline {
  background: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 12% 18%, rgba(112, 160, 0, 0.28), transparent 32%),
    radial-gradient(circle at 88% 8%, rgba(0, 80, 32, 0.55), transparent 36%),
    linear-gradient(145deg, #003816 0%, #005020 48%, #0a6a2c 100%);
  color: #fff;
  padding-block: clamp(2.4rem, 6vw, 5.5rem);
}

.hero__decor {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.hero__blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
}

.hero__blob--a {
  width: 22rem;
  height: 22rem;
  right: -4rem;
  top: -6rem;
  background: radial-gradient(circle, rgba(112, 176, 0, 0.28), transparent 68%);
}

.hero__blob--b {
  width: 16rem;
  height: 16rem;
  left: -3rem;
  bottom: -5rem;
  background: radial-gradient(circle, rgba(154, 209, 42, 0.18), transparent 70%);
}

.hero__flow {
  position: absolute;
  right: -6%;
  bottom: 4%;
  width: min(46rem, 70%);
  opacity: 0.9;
}

.hero::after {
  display: none;
}

.hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-xl);
  align-items: center;
}

.hero__actions {
  grid-column: 1 / -1;
}

.hero h1,
.page-hero h1 { color: #fff; }

.hero p,
.page-hero p { color: rgba(255, 255, 255, 0.9); }

.price-card {
  position: relative;
  isolation: isolate;
  background: #fff;
  color: var(--color-text);
  border-radius: var(--radius-lg);
  padding: clamp(1.4rem, 3vw, 2.4rem);
  box-shadow: var(--shadow-lg);
  border: 5px solid var(--color-accent);
  text-align: center;
}

.price-card::before {
  content: "";
  position: absolute;
  inset: -22%;
  z-index: -1;
  background: radial-gradient(circle, rgba(112, 176, 0, 0.38), transparent 64%);
  pointer-events: none;
  animation: glow-shift 9s ease-in-out infinite;
}

.hero .price-card p,
.price-card p { color: var(--color-text); }

.price-card__label {
  margin: 0;
  font-size: var(--fs-sm);
  color: var(--color-primary);
  font-weight: var(--fw-medium);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.price-card__value {
  margin: 0.55rem 0 0.7rem;
  font-size: clamp(2.05rem, 5.4vw, 3.7rem);
  line-height: 1.02;
  font-weight: var(--fw-bold);
  color: var(--color-primary);
  letter-spacing: 0.01em;
}

.hero .price-card__value { color: var(--color-primary); }

.price-card__note {
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
}

.hero-cta {
  margin-top: var(--space-md);
}

.trust-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  margin: var(--space-lg) 0 0;
  padding: 0;
  list-style: none;
}

.trust-points li {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  font-size: var(--fs-sm);
  color: #fff;
}

.price-disclaimer {
  position: relative;
  z-index: 1;
  margin-top: var(--space-lg);
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.86);
  max-width: 48rem;
}

/* Karten */
.grid-2, .grid-3, .grid-4, .grid-5 {
  display: grid;
  gap: var(--space-md);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: transform 280ms ease, box-shadow 280ms ease, border-color 280ms ease;
}

.icon-wrap {
  width: 3.1rem;
  height: 3.1rem;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  background: var(--color-accent-soft);
  color: var(--color-primary);
  margin-bottom: var(--space-md);
  transition: transform 280ms ease;
}

.card h3 { margin-bottom: var(--space-sm); }

.card--wide {
  grid-column: 1 / -1;
}

.icon-wrap img,
.icon-wrap svg {
  width: 1.7rem;
  height: 1.7rem;
}

.steps {
  display: grid;
  gap: var(--space-md);
}

.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-md);
  background: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  transition: transform 280ms ease, box-shadow 280ms ease, border-color 280ms ease;
}

.step__num {
  width: 2.6rem;
  height: 2.6rem;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: var(--fw-bold);
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: 0;
  list-style: none;
}

.building-card {
  text-align: left;
}

.building-card strong {
  display: block;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}

.coverage-panel {
  position: relative;
  overflow: hidden;
  text-align: center;
  padding: clamp(2.5rem, 6vw, 4.75rem) clamp(1.25rem, 4vw, 3.25rem);
  border-radius: var(--radius-lg);
  background: linear-gradient(165deg, #f5f9eb 0%, #e7f2d4 100%);
  border: 1px solid rgba(0, 80, 32, 0.14);
  box-shadow: var(--shadow-sm);
}

.coverage-panel__flow {
  position: absolute;
  inset: auto -8% -28% 18%;
  width: min(42rem, 75%);
  opacity: 0.32;
  pointer-events: none;
}

.coverage-panel__inner {
  position: relative;
  z-index: 1;
  max-width: 50rem;
  margin-inline: auto;
}

.coverage-panel__inner h2 {
  max-width: 22ch;
  margin-inline: auto;
}

.coverage-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin: var(--space-xl) 0;
  padding: 0;
  list-style: none;
}

.coverage-points li {
  background: #fff;
  border-radius: var(--radius-md);
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.coverage-points .icon-wrap {
  margin-inline: auto;
}

.coverage-points strong {
  display: block;
  color: var(--color-primary);
}

/* FAQ – JS-Akkordeon */
.faq {
  display: grid;
  gap: var(--space-sm);
}

.faq-item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.faq-item h3 {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.faq-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  background: none;
  border: 0;
  font: inherit;
  font-weight: var(--fw-medium);
  text-align: left;
  padding: var(--space-md);
  cursor: pointer;
  color: var(--color-text);
}

.faq-trigger::after {
  content: "+";
  flex-shrink: 0;
  color: var(--color-primary);
  font-size: 1.35rem;
  line-height: 1;
}

.faq-trigger[aria-expanded="true"]::after {
  content: "–";
}

.faq-panel {
  padding: 0 var(--space-md) var(--space-md);
}

.faq-panel[hidden] {
  display: none;
}

/* Formulare */
.form-wrap {
  max-width: 52rem;
}

.form {
  display: grid;
  gap: var(--space-md);
  background: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

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

.field--full { grid-column: 1 / -1; }

label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
}

input,
select,
textarea {
  width: 100%;
  font: inherit;
  color: var(--color-text);
  background: #fbfcfb;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.8rem;
}

input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"] {
  border-color: var(--color-error);
  background: #fff7f6;
}

textarea {
  min-height: 8rem;
  resize: vertical;
}

.checkbox {
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
}

.checkbox input {
  width: auto;
  min-width: 1.1rem;
  min-height: 1.1rem;
  margin-top: 0.3rem;
}

.field-error {
  color: var(--color-error);
  font-size: var(--fs-xs);
  min-height: 1.1em;
}

.form__demo-note {
  font-size: var(--fs-sm);
  background: #fff8e6;
  border: 1px solid #f0d48a;
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
}

.form-success {
  display: none;
  background: var(--color-accent-soft);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.form-success.is-visible {
  display: block;
}

/* CTA / Footer / Legal */
.cta-band {
  background: var(--color-primary);
  color: #fff;
  padding-block: var(--space-2xl);
}

.cta-band h2,
.cta-band p { color: #fff; }

.site-footer {
  background: #102318;
  color: #d7e4dd;
  padding-block: var(--space-2xl) var(--space-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-xl);
}

.site-footer h2,
.site-footer p,
.site-footer a { color: #e8f0ec; }

.site-footer h2 { font-size: 1.1rem; }

.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer li + li { margin-top: 0.45rem; }

.footer-bottom {
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: var(--fs-sm);
}

.legal { max-width: 50rem; }
.legal h2 { margin-top: var(--space-xl); }

.page-hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary) 48%, var(--color-primary-soft));
  color: #fff;
  padding-block: var(--space-2xl);
}

.contact-facts p { margin-bottom: 0.7rem; }

.reveal,
.reveal-left,
.reveal-right,
.reveal-scale,
.stagger-item {
  opacity: 1;
  transform: none;
}

.js-ready .reveal,
.js-ready .stagger-item {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 650ms ease, transform 650ms ease;
}

.js-ready .reveal-left {
  opacity: 0;
  transform: translateX(-28px);
  transition: opacity 650ms ease, transform 650ms ease;
}

.js-ready .reveal-right {
  opacity: 0;
  transform: translateX(28px);
  transition: opacity 650ms ease, transform 650ms ease;
}

.js-ready .reveal-scale {
  opacity: 0;
  transform: scale(0.97);
  transition: opacity 700ms ease, transform 700ms ease;
}

.js-ready .reveal.is-visible,
.js-ready .reveal-left.is-visible,
.js-ready .reveal-right.is-visible,
.js-ready .reveal-scale.is-visible,
.js-ready .stagger-item.is-visible {
  opacity: 1;
  transform: none;
}

.js-ready .price-card.is-visible .price-card__value {
  animation: price-emphasis 700ms ease;
}

@keyframes price-emphasis {
  0% { transform: scale(0.98); }
  55% { transform: scale(1.03); }
  100% { transform: none; }
}

@keyframes glow-shift {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 0.85; transform: scale(1.06); }
}

@media (hover: hover) and (pointer: fine) {
  .nav__link:hover {
    color: var(--color-primary);
  }

  .nav__link:hover::after {
    transform: scaleX(1);
  }

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

  .btn--accent:hover {
    background-position: 100% 50%;
    color: #fff;
  }

  .btn--ghost:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
  }

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

  .card:hover,
  .step:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: rgba(112, 160, 0, 0.45);
  }

  .card:hover .icon-wrap {
    transform: scale(1.06);
  }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-progress {
    display: none;
  }

  .hero__blob {
    transform: none !important;
  }

  .js-ready .reveal,
  .js-ready .reveal-left,
  .js-ready .reveal-right,
  .js-ready .reveal-scale,
  .js-ready .stagger-item,
  .js-ready .reveal.is-visible,
  .js-ready .reveal-left.is-visible,
  .js-ready .reveal-right.is-visible,
  .js-ready .reveal-scale.is-visible,
  .js-ready .stagger-item.is-visible {
    transform: none;
    transition: none;
    opacity: 1;
  }

  .price-card::before,
  .js-ready .price-card.is-visible .price-card__value,
  .hero__blob,
  .scroll-progress__bar {
    animation: none !important;
    transition: none !important;
  }

  .card,
  .step,
  .icon-wrap,
  .btn {
    transition: none;
  }
}

@media (max-width: 1080px) {
  .grid-5 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 960px) {
  .hero__grid,
  .footer-grid,
  .grid-4,
  .grid-3 { grid-template-columns: 1fr 1fr; }

  .nav-toggle { display: inline-block; flex-shrink: 0; }

  .site-logo img {
    height: 52px;
  }

  .nav {
    position: fixed;
    inset: var(--header-height) 0 0 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-md);
    box-shadow: var(--shadow-md);
    transform: translateY(-108%);
    visibility: hidden;
    opacity: 0;
    overflow-y: auto;
    transition: transform var(--ease), opacity var(--ease), visibility var(--ease);
  }

  .nav.is-open {
    transform: none;
    visibility: visible;
    opacity: 1;
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
  }

  .nav .btn { width: 100%; }
}

@media (max-width: 700px) {
  .hero__grid,
  .footer-grid,
  .grid-5,
  .grid-4,
  .grid-3,
  .grid-2,
  .form-grid,
  .trust-points,
  .coverage-points {
    grid-template-columns: 1fr;
  }

  .site-logo img {
    height: 48px;
  }
}