/* Reineke Technik — E-Mail Authentifizierungs-Check
 * Brand palette derived from reineke-technik.de live CSS:
 *   primary red #dc0d23, dark red #8a060e, gray #5a5a5a, light borders #e6e7e6.
 * Typography matches the site stack: 'Frutiger' (if available) with a humanist
 * sans-serif fallback. Body weight 300 / strong 700 — the Reineke signature
 * "light heading + bold word" look.
 */

:root {
  --rt-red: #dc0d23;
  --rt-red-dark: #8a060e;
  --rt-red-soft: #fcf0ef;
  --rt-black: #000000;
  --rt-ink: #1a1a1a;
  --rt-gray: #5a5a5a;
  --rt-gray-mid: #949494;
  --rt-gray-light: #c8c8c8;
  --rt-border: #e6e7e6;
  --rt-bg: #ffffff;
  --rt-bg-soft: #f7f7f7;
  --rt-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --rt-sans:
    "Frutiger", "Frutiger LT Std", -apple-system, BlinkMacSystemFont, "Helvetica Neue",
    Helvetica, Arial, sans-serif;

  --pass: #1f7a3f;
  --pass-bg: #e8f4ec;
  --warn: #a8590b;
  --warn-bg: #fbf2e1;
  --fail: var(--rt-red);
  --fail-bg: var(--rt-red-soft);
  --info: #1d4f8b;
  --info-bg: #e3edf8;

  --transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--rt-sans);
  font-size: 18px;
  line-height: 1.55;
  font-weight: 300;
  color: var(--rt-black);
  background: var(--rt-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

b, strong { font-weight: 700; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

.mono { font-family: var(--rt-mono); }

/* ─── Header ──────────────────────────────────────────────── */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--rt-border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 2rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}
.brand-logo {
  height: 56px;
  width: auto;
  display: block;
}
.header-meta {
  display: flex;
  align-items: center;
  padding-left: 1.25rem;
  border-left: 1px solid var(--rt-border);
}
.partner-logo {
  height: 56px;
  width: auto;
  display: block;
}

/* ─── Hero ───────────────────────────────────────────────── */
.hero {
  padding: 6rem 0 5rem;
  background: #fff;
  border-bottom: 1px solid var(--rt-border);
  position: relative;
}
.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 4px;
  background: linear-gradient(90deg, var(--rt-red) 0%, var(--rt-red) 30%, transparent 30%);
  opacity: 0.08;
}
.hero-inner { max-width: 920px; }

.eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--rt-red);
  font-weight: 700;
  margin: 0 0 1.25rem;
}

.hero h1 {
  font-family: var(--rt-sans);
  font-size: clamp(2.4rem, 4.5vw + 1rem, 4.25rem);
  line-height: 1.1;
  font-weight: 300;
  margin: 0 0 2rem;
  color: var(--rt-black);
  letter-spacing: -0.015em;
}
.hero h1 strong { font-weight: 700; }

.lead {
  font-size: 1.2rem;
  line-height: 1.55;
  color: var(--rt-gray);
  margin: 0 0 3rem;
  max-width: 60ch;
  font-weight: 300;
}
.lead strong { color: var(--rt-black); font-weight: 700; }

/* ─── Check form ─────────────────────────────────────────── */
.check-form { max-width: 780px; }

.input-group {
  display: flex;
  gap: 0;
  background: #fff;
  border: 1px solid var(--rt-border);
  border-radius: 0;
  padding: 0;
  transition: var(--transition);
}
.input-group:focus-within {
  border-color: var(--rt-red);
  box-shadow: 0 0 0 1px var(--rt-red);
}
.input-group input {
  flex: 1;
  border: 0;
  background: transparent;
  font-size: 1.1rem;
  padding: 1.1rem 1.25rem;
  font-family: var(--rt-mono);
  color: var(--rt-black);
  outline: none;
  font-weight: 400;
}
.input-group input::placeholder { color: var(--rt-gray-mid); font-weight: 300; }

.btn {
  border: 0;
  border-radius: 0;
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  font-family: var(--rt-sans);
  transition: var(--transition);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  text-decoration: none;
  letter-spacing: 0.02em;
  text-transform: none;
  line-height: 1;
  white-space: nowrap;
}
.btn-primary {
  background: var(--rt-red);
  color: #fff;
}
.btn-primary:hover { background: var(--rt-red-dark); }
.btn-primary:active { transform: translateY(1px); }
.btn-secondary {
  background: transparent;
  color: var(--rt-black);
  border: 1px solid var(--rt-black);
}
.btn-secondary:hover {
  background: var(--rt-black);
  color: #fff;
}
.btn:disabled { opacity: 0.6; cursor: progress; }

.spinner {
  display: none;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
.btn.loading .spinner { display: inline-block; }
.btn.loading .btn-label { opacity: 0.6; }
@keyframes spin { to { transform: rotate(360deg); } }

.advanced {
  margin-top: 1.5rem;
  padding: 0.5rem 0;
}
.advanced > summary {
  cursor: pointer;
  color: var(--rt-red);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  user-select: none;
  text-transform: uppercase;
}
.advanced > summary:hover { color: var(--rt-red-dark); }
.advanced label {
  display: block;
  margin: 1rem 0 0.4rem;
  font-size: 0.85rem;
  color: var(--rt-gray);
  font-weight: 700;
}
.advanced input {
  width: 100%;
  border: 1px solid var(--rt-border);
  border-radius: 0;
  padding: 0.75rem 1rem;
  font-family: var(--rt-mono);
  font-size: 0.92rem;
  background: #fff;
  transition: var(--transition);
}
.advanced input:focus {
  border-color: var(--rt-red);
  outline: none;
}
.hint {
  margin: 0.65rem 0 0;
  font-size: 0.82rem;
  color: var(--rt-gray);
  font-weight: 300;
}

.error-banner {
  margin-top: 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--rt-red-soft);
  color: var(--rt-red-dark);
  border-left: 3px solid var(--rt-red);
  font-size: 0.95rem;
}

/* ─── Results ────────────────────────────────────────────── */
.results {
  padding: 5rem 0;
  background: var(--rt-bg-soft);
}
.results-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--rt-border);
}
.results-header h2 {
  margin: 0;
  font-size: 1.85rem;
  font-weight: 300;
  color: var(--rt-black);
  letter-spacing: -0.01em;
}
.results-header h2 .mono {
  font-weight: 700;
  font-family: var(--rt-mono);
}
.result-timestamp {
  font-size: 0.85rem;
  color: var(--rt-gray);
  font-family: var(--rt-mono);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}
.card {
  background: #fff;
  border: 1px solid var(--rt-border);
  border-radius: 0;
  padding: 1.85rem 1.85rem 2rem;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}
.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--rt-border);
}
.card[data-status="pass"]::before { background: var(--pass); }
.card[data-status="warn"]::before { background: var(--warn); }
.card[data-status="fail"]::before { background: var(--fail); }
.card[data-status="info"]::before { background: var(--info); }

.card-primary { grid-column: 1 / -1; }
.card-primary h3 { font-size: 1.8rem; }
.card-primary { padding: 2.5rem; }

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}
.card-header h3 {
  margin: 0;
  color: var(--rt-black);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.005em;
  text-transform: uppercase;
}
.card-summary {
  margin: 0 0 1.2rem;
  color: var(--rt-gray);
  font-size: 1rem;
  font-weight: 300;
}
.card-body { font-size: 0.95rem; }

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.9rem;
  border-radius: 0;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: var(--rt-bg-soft);
  color: var(--rt-gray);
  border: 1px solid var(--rt-border);
}
.status-pill[data-status="pass"] { background: var(--pass-bg); color: var(--pass); border-color: var(--pass); }
.status-pill[data-status="warn"] { background: var(--warn-bg); color: var(--warn); border-color: var(--warn); }
.status-pill[data-status="fail"] { background: var(--fail-bg); color: var(--fail); border-color: var(--fail); }
.status-pill[data-status="info"] { background: var(--info-bg); color: var(--info); border-color: var(--info); }

/* ─── Issues list ────────────────────────────────────────── */
.issues {
  list-style: none;
  padding: 0;
  margin: 0.85rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.issue {
  display: flex;
  gap: 0.85rem;
  padding: 0.85rem 1rem;
  border-left: 3px solid;
  background: var(--rt-bg-soft);
  font-size: 0.92rem;
}
.issue[data-severity="pass"] { border-color: var(--pass); background: var(--pass-bg); }
.issue[data-severity="warn"] { border-color: var(--warn); background: var(--warn-bg); }
.issue[data-severity="fail"] { border-color: var(--fail); background: var(--fail-bg); }
.issue[data-severity="info"] { border-color: var(--info); background: var(--info-bg); }
.issue-icon {
  flex: 0 0 1rem;
  margin-top: 0.05rem;
  font-weight: 700;
  font-family: var(--rt-mono);
}
.issue[data-severity="pass"] .issue-icon { color: var(--pass); }
.issue[data-severity="warn"] .issue-icon { color: var(--warn); }
.issue[data-severity="fail"] .issue-icon { color: var(--fail); }
.issue[data-severity="info"] .issue-icon { color: var(--info); }
.issue p { margin: 0; font-weight: 400; }
.issue .rec {
  margin-top: 0.3rem;
  font-size: 0.85rem;
  color: var(--rt-gray);
  font-weight: 300;
}

/* ─── Raw record + kv pairs ─────────────────────────────── */
.record-block {
  margin-top: 1rem;
  background: var(--rt-black);
  color: #e4e7eb;
  padding: 0.9rem 1.1rem;
  border-radius: 0;
  font-family: var(--rt-mono);
  font-size: 0.82rem;
  word-break: break-all;
  white-space: pre-wrap;
  line-height: 1.55;
}

.kv-grid {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.4rem 1rem;
  margin-top: 0.85rem;
  font-size: 0.9rem;
}
.kv-grid dt { font-weight: 700; color: var(--rt-gray); text-transform: uppercase; letter-spacing: 0.06em; font-size: 0.78rem; align-self: center; }
.kv-grid dd { margin: 0; font-family: var(--rt-mono); color: var(--rt-black); }

.mx-list, .dkim-list {
  list-style: none;
  padding: 0;
  margin: 0.85rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.mx-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.85rem;
  padding: 0.75rem 1rem;
  background: var(--rt-bg-soft);
  border-left: 3px solid var(--rt-border);
  font-family: var(--rt-mono);
  font-size: 0.88rem;
  flex-wrap: wrap;
}
.mx-prio {
  background: var(--rt-black);
  color: #fff;
  padding: 0.15rem 0.6rem;
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: var(--rt-sans);
}
.mx-ips { color: var(--rt-gray); font-size: 0.8rem; }

.dkim-item {
  background: var(--rt-bg-soft);
  border-left: 3px solid var(--pass);
  padding: 0.85rem 1rem;
}
.dkim-item .sel {
  font-family: var(--rt-mono);
  font-weight: 700;
  color: var(--rt-black);
}
.dkim-item .meta {
  font-size: 0.8rem;
  color: var(--rt-gray);
  margin-left: 0.6rem;
}

/* ─── Info / CTA section ─────────────────────────────────── */
.info {
  background: #fff;
  padding: 6rem 0;
  border-top: 1px solid var(--rt-border);
}
.section-eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--rt-red);
  font-weight: 700;
  margin: 0 0 1rem;
}
.info > .container > h2 {
  font-size: clamp(1.85rem, 3vw + 0.5rem, 2.85rem);
  line-height: 1.2;
  font-weight: 300;
  color: var(--rt-black);
  margin: 0 0 3rem;
  max-width: 24ch;
  letter-spacing: -0.01em;
}
.info > .container > h2 strong { font-weight: 700; }

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2.5rem;
  margin-bottom: 4rem;
}
.info-grid h4 {
  margin: 0 0 0.75rem;
  color: var(--rt-black);
  font-size: 1.2rem;
  font-weight: 700;
}
.info-grid p {
  margin: 0;
  color: var(--rt-gray);
  font-size: 1rem;
  line-height: 1.6;
  font-weight: 300;
}
.info-grid code {
  background: var(--rt-bg-soft);
  color: var(--rt-red-dark);
  padding: 0.1rem 0.4rem;
  border-radius: 0;
  font-size: 0.85em;
  font-family: var(--rt-mono);
  font-weight: 400;
}

.cta-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rt-border);
}

/* ─── Footer ─────────────────────────────────────────────── */
.site-footer {
  background: var(--rt-black);
  color: #c8c8c8;
  padding: 2.5rem 0;
  font-size: 0.92rem;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.footer-brand strong {
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.footer-nav { display: flex; gap: 1.75rem; flex-wrap: wrap; }
.footer-nav a {
  color: #c8c8c8;
  text-decoration: none;
  transition: var(--transition);
}
.footer-nav a:hover { color: #fff; }

/* ─── Responsive ─────────────────────────────────────────── */
@media (max-width: 768px) {
  .container { padding: 0 1.25rem; }
  .header-inner { padding: 1rem 1.25rem; }
  .brand-logo { height: 44px; }
  .header-meta { padding-left: 0.75rem; }
  .partner-logo { height: 44px; }
  .hero { padding: 3.5rem 0 3rem; }
  .lead { font-size: 1.05rem; margin-bottom: 2rem; }
  .input-group { flex-direction: column; border-width: 1px; }
  .input-group input { border-bottom: 1px solid var(--rt-border); padding: 0.95rem 1rem; }
  .btn-primary { width: 100%; padding: 1.05rem; }
  .results { padding: 3rem 0; }
  .card { padding: 1.5rem 1.4rem; }
  .card-primary { padding: 1.5rem 1.4rem; }
  .info { padding: 4rem 0; }
  .info-grid { gap: 2rem; margin-bottom: 2.5rem; }
}

@media (max-width: 480px) {
  .results-header h2 { font-size: 1.4rem; }
  .card-primary h3, .card-header h3 { font-size: 1.3rem; }
}