/* Server-rendered fallback: keep dependency-free, use system fonts. */
  @font-face {
    font-family: 'Collapse';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('/fonts/Collapse-Regular.woff2') format('woff2');
  }
  @font-face {
    font-family: 'Collapse';
    font-style: normal;
    font-weight: 700;
    font-display: swap;
    src: url('/fonts/Collapse-Bold.woff2') format('woff2');
  }
  @font-face {
    font-family: 'Rules Compressed';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('/fonts/RulesCompressed-Regular.woff2') format('woff2');
  }
  @font-face {
    font-family: 'Rules Compressed';
    font-style: normal;
    font-weight: 600;
    font-display: swap;
    src: url('/fonts/RulesCompressed-Medium.woff2') format('woff2');
  }

  :root {
    --background-base: #f4f1ec;
    --background: #fffaf2;
    --midground: #8a6842;
    --foreground: #292720;
    --muted: #756a5b;
    --soft: #f8f0e3;
    --hairline: #dccfbd;
    --hairline-strong: #cdbda8;
  }

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

  html, body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    background: var(--background-base);
    color: var(--foreground);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  body {
    background-image:
      radial-gradient(ellipse at top left, rgba(215, 185, 142, .22) 0%, transparent 42%),
      linear-gradient(180deg, #f7f3ed 0%, #ede6db 100%);
    background-attachment: fixed;
  }

  /* Layout: vertically center on tall screens, top-anchor on short. */
  body {
    display: grid;
    place-items: center;
    padding: clamp(1.5rem, 6vh, 6rem) 1.25rem;
  }

  main {
    width: 100%;
    max-width: 27rem;
    position: relative;
    animation: slide-up 0.6s ease-out both;
  }

  @keyframes slide-up {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
  }

  @media (prefers-reduced-motion: reduce) {
    main { animation: none; }
  }

  /* Brand wordmark above the card — same uppercase + wide-tracking
     idiom DS Buttons use. */
  .brand {
    text-align: center;
    margin-bottom: 1.75rem;
    font-weight: 800;
    font-size: 1rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--foreground);
  }
  .brand .dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    background: #d7b98e;
    margin: 0 0.55em 0.18em;
    vertical-align: middle;
    border-radius: 999px;
  }

  .card {
    position: relative;
    padding: 2.2rem 2rem 2rem;
    background: rgba(255, 250, 242, .96);
    border: 1px solid var(--hairline);
    border-radius: 26px;
    box-shadow: 0 28px 90px rgba(48, 38, 22, .18);
  }

  h1 {
    margin: 0 0 0.4rem;
    font-weight: 800;
    font-size: 1.8rem;
    letter-spacing: -0.03em;
    color: var(--foreground);
  }

  .subtitle {
    margin: 0 0 1.75rem;
    color: var(--muted);
    font-size: 0.95rem;
  }

  .provider-list {
    display: grid;
    gap: 0.75rem;
  }

  /* Provider button — mirrors AIWerk CUI rounded warm controls. */
  .provider-btn {
    display: block;
    width: 100%;
    box-sizing: border-box;
    padding: 0.95rem 1rem;
    text-align: center;
    background: #292720;
    color: #fffaf2;
    font-family: inherit;
    font-weight: 800;
    font-size: 0.95rem;
    letter-spacing: -0.01em;
    text-decoration: none;
    border: 0;
    border-radius: 14px;
    cursor: pointer;
    box-shadow: 0 14px 34px rgba(41, 39, 32, .18);
    transition: filter 0.12s ease-out;
  }
  .provider-btn:hover {
    filter: brightness(1.08);
  }
  .provider-btn:active {
    transform: translateY(1px);
  }
  .provider-btn:focus-visible {
    outline: 2px solid var(--midground);
    outline-offset: 3px;
  }

  /* Zugangsdatenformular — gleiche visuelle Sprache wie die Login-Buttons. */
  .provider-form {
    display: grid;
    gap: 0.75rem;
    text-align: left;
  }
  .form-title {
    font-family: inherit;
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: -0.01em;
    text-transform: none;
    color: var(--foreground);
  }
  .field {
    display: grid;
    gap: 0.3rem;
  }
  .field-label {
    font-size: 0.82rem;
    letter-spacing: 0;
    text-transform: none;
    color: color-mix(in srgb, var(--foreground) 60%, transparent);
  }
  .field-input {
    width: 100%;
    box-sizing: border-box;
    padding: 0.7rem 0.8rem;
    background: #fffaf2;
    color: var(--foreground);
    border: 1px solid var(--hairline-strong);
    border-radius: 12px;
    font-family: inherit;
    font-size: 0.95rem;
  }
  .field-input:focus-visible {
    outline: none;
    border-color: var(--midground);
    box-shadow: 0 0 0 1px var(--midground);
  }
  .form-error {
    color: #9b4f43;
    font-size: 0.82rem;
    letter-spacing: 0.02em;
  }
  .provider-form .provider-btn {
    margin-top: 0.25rem;
  }

  footer {
    margin-top: 1.75rem;
    text-align: center;
    color: #8b7d6c;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    line-height: 1.7;
  }
  footer .sep {
    display: inline-block;
    width: 1.5rem;
    height: 1px;
    background: var(--hairline-strong);
    vertical-align: middle;
    margin: 0 0.6em 0.2em;
  }

  /* Selection */
  ::selection {
    background: #d7b98e;
    color: var(--background-base);
  }

/* Preserve the original empty-error spacing without inline styles. */
#message:empty { display: none; }
#message { margin: 0; }