/* Dark is the default; [data-theme="light"] overrides the palette. */
:root,
:root[data-theme='dark'] {
  --bg: #0b1020;
  --bg-soft: #121a30;
  --card: #16203a;
  --text: #e8ecf6;
  --muted: #9aa6c2;
  --accent: #5b8cff;
  --accent-2: #38e1c4;
  --border: #243153;
  --header-bg: rgba(11, 16, 32, 0.85);
  --on-accent: #07101f;
  --maxw: 1040px;
}

:root[data-theme='light'] {
  --bg: #f7f9fc;
  --bg-soft: #eef2f8;
  --card: #ffffff;
  --text: #14203a;
  --muted: #5b6b86;
  --accent: #2f6bff;
  --accent-2: #0fb6a0;
  --border: #d8e0ee;
  --header-bg: rgba(247, 249, 252, 0.85);
  --on-accent: #ffffff;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background 0.2s ease, color 0.2s ease;
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  /* Skaliert mit dem Viewport: 20px auf engen Phones, bis 32px auf Desktop.
     Sorgt dafür dass nichts den Bildschirmrand berührt — auch nicht in der
     mobilen Burger-Drawer-Ansicht oder im Excel-Layout. */
  padding-inline: clamp(20px, 4vw, 32px);
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--header-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  font-weight: 800;
  letter-spacing: 0.18em;
  font-size: 1.1rem;
  color: var(--accent);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 0.95rem;
  color: var(--muted);
}

.site-nav a:hover {
  color: var(--text);
}

/* ─── Burger / mobile nav (pure CSS, no JS) ───────────────────────────
   Strategy: a hidden checkbox sits as a sibling to .site-nav. The .nav-burger
   label flips it. On narrow viewports we hide the nav, show the burger, and
   reveal the nav as a drawer when the checkbox is :checked. */

.nav-toggle { display: none; }     /* the checkbox is never visible itself */

.nav-burger {
  display: none;                    /* hidden on desktop */
  width: 40px;
  height: 40px;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  flex-direction: column;
  justify-content: space-between;
  align-items: stretch;
  box-sizing: border-box;
}
.nav-burger span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

@media (max-width: 720px) {
  .header-inner { position: relative; }

  .nav-burger { display: flex; }

  /* Hide nav by default on mobile; drawer-style when toggled. */
  .site-nav {
    position: absolute;
    top: 64px;                       /* sit right below the header bar */
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 16px 16px;
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease;
  }
  .site-nav a {
    padding: 12px 8px;
    border-top: 1px solid var(--border);
  }
  .site-nav a:first-of-type { border-top: none; }
  .site-nav .theme-toggle {
    margin-top: 12px;
    align-self: flex-start;
  }

  .nav-toggle:checked ~ .site-nav {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
}

.theme-toggle {
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 14px;
  transition: border-color 0.15s ease, transform 0.12s ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
}

.hero {
  padding: 120px 0 96px;
  background:
    radial-gradient(800px 400px at 70% -10%, rgba(91, 140, 255, 0.22), transparent),
    radial-gradient(600px 400px at 10% 10%, rgba(56, 225, 196, 0.14), transparent);
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 16ch;
}

.hero-sub {
  margin-top: 20px;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--muted);
  max-width: 60ch;
}

.hero-cta {
  margin-top: 36px;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 13px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.98rem;
  cursor: pointer;
  transition: transform 0.12s ease, opacity 0.12s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--on-accent);
  border: none;
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: default;
  transform: none;
}

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
}

.section {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.section:nth-of-type(even) {
  background: var(--bg-soft);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  color: var(--accent-2);
  font-weight: 700;
}

.section h2 {
  margin-top: 10px;
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  letter-spacing: -0.01em;
}

.lead {
  margin-top: 16px;
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 68ch;
}

.feature-list {
  margin-top: 28px;
  list-style: none;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.feature-list li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 22px;
  position: relative;
  padding-left: 46px;
}

.feature-list li::before {
  content: '→';
  position: absolute;
  left: 20px;
  color: var(--accent);
  font-weight: 700;
}

.contact-form {
  margin-top: 28px;
  max-width: 560px;
  display: grid;
  gap: 18px;
}

.contact-form label {
  display: grid;
  gap: 8px;
  font-size: 0.95rem;
  color: var(--muted);
}

.contact-form input,
.contact-form textarea {
  font: inherit;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  width: 100%;
  resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.contact-form .btn {
  justify-self: start;
}

.form-success {
  margin-top: 28px;
  padding: 18px 22px;
  border-radius: 12px;
  background: var(--card);
  border: 1px solid var(--accent-2);
  color: var(--text);
  max-width: 560px;
}

.form-error {
  color: #ff6b6b;
  font-size: 0.95rem;
}

.form-alt {
  margin-top: 22px;
  color: var(--muted);
  font-size: 0.95rem;
}

.form-alt a {
  color: var(--accent);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer a {
  color: var(--accent);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 28px;
}

.footer-legal {
  display: flex;
  gap: 18px;
}

/* Referenz-Section ---------------------------------------------------------*/
.reference-list {
  margin-top: 28px;
  list-style: none;
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.reference-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.reference-card h3 {
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}

.reference-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-2);
  background: color-mix(in srgb, var(--accent-2) 12%, transparent);
  padding: 4px 10px;
  border-radius: 999px;
  font-weight: 700;
}

.reference-body {
  color: var(--muted);
  font-size: 0.97rem;
}

.reference-stack {
  margin-top: auto;
  color: var(--text);
  font-size: 0.82rem;
  font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  opacity: 0.75;
}

/* CTA row in Kontakt section ----------------------------------------------*/
.cta-row {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* Form-consent note --------------------------------------------------------*/
.form-consent {
  color: var(--muted);
  font-size: 0.85rem;
}

.form-consent a {
  color: var(--accent);
}

/* Legal pages (Impressum, Datenschutz) ------------------------------------*/
.draft-notice {
  margin-top: 28px;
  padding: 14px 18px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--accent-2) 14%, transparent);
  border: 1px solid var(--accent-2);
  color: var(--text);
  font-size: 0.92rem;
}

.legal-block {
  margin-top: 28px;
  max-width: 72ch;
  color: var(--text);
  display: grid;
  gap: 14px;
}

.legal-block h3 {
  margin-top: 18px;
  font-size: 1.05rem;
  letter-spacing: -0.005em;
}

.legal-block p {
  color: var(--muted);
  font-size: 0.97rem;
}

.legal-block code {
  font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 6px;
}

.legal-block a {
  color: var(--accent);
}