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

  :root {
    --green: #55c951;
    --green-dark: #3aaa36;
    --green-light: rgba(85,201,81,0.12);
    --blue: #007AFF;
    --radius: 13.5px;
    --bg: #f2f5f2;
    --text: #1a1f1a;
    --muted: #7a8a7a;
    --border: #dde8dd;
  }

  body {
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
  }

  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
      radial-gradient(ellipse 65% 55% at 10% 15%, rgba(85,201,81,0.16) 0%, transparent 60%),
      radial-gradient(ellipse 45% 50% at 90% 85%, rgba(85,201,81,0.10) 0%, transparent 60%);
    z-index: 0;
    animation: bgShift 9s ease-in-out infinite alternate;
  }

  @keyframes bgShift {
    0%   { transform: scale(1); }
    100% { transform: scale(1.04) translate(-1%, 1%); }
  }

  /* Card */
  .card {
    position: relative;
    z-index: 1;
    background: #fff;
    border-radius: calc(var(--radius) * 2);
    box-shadow: 0 20px 60px rgba(0,0,0,0.10), 0 4px 16px rgba(85,201,81,0.08);
    width: 100%;
    max-width: 400px;
    overflow: hidden;
    animation: cardIn 0.6s cubic-bezier(.22,1,.36,1) both;
  }

  @keyframes cardIn {
    from { opacity: 0; transform: translateY(24px) scale(0.97); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
  }

  /* Green top bar */
  .card-top {
    background: linear-gradient(135deg, #2db82a 0%, #55c951 55%, #7dd67a 100%);
    padding: 28px 32px 24px;
    text-align: center;
  }

  /* Logo */
  .logo-area {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
  }

  .logo-square {
    width: 40px; height: 40px;
    border-radius: var(--radius);
    background: rgba(255,255,255,0.25);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
  }

  #error_msg{
    color: red;
    font-size: 12px;
    margin-bottom: 24px;
    display: none;
  }

  .logo-square svg { width: 20px; height: 20px; }

  .logo-text {
    font-size: 18px; font-weight: 700;
    color: white; letter-spacing: -0.2px;
  }

  .card-top h1 {
    font-size: 20px; font-weight: 700;
    color: #fff; margin-bottom: 5px; line-height: 1.3;
  }

  .card-top p {
    font-size: 13px; color: rgba(255,255,255,0.85); line-height: 1.5;
  }

  /* Form area */
  .card-body {
    padding: 28px 32px 32px;
  }

  /* Badge "Schüler-Login" */
  .badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--green-light);
    border: 1px solid rgba(85,201,81,0.3);
    border-radius: 99px;
    padding: 4px 12px;
    font-size: 12px;
    font-weight: 700;
    color: var(--green-dark);
    margin-bottom: 22px;
    letter-spacing: 0.2px;
  }

  .badge svg { width: 13px; height: 13px; }

  /* Fields */
  .field { margin-bottom: 14px; }

  .field label {
    display: block;
    font-size: 11.5px; font-weight: 700;
    color: var(--text); margin-bottom: 6px;
    letter-spacing: 0.4px; text-transform: uppercase;
  }

  .input-wrap { position: relative; }

  .input-wrap .icon {
    position: absolute; left: 13px; top: 50%;
    transform: translateY(-50%);
    color: var(--muted); width: 15px; height: 15px;
    pointer-events: none;
  }

  .field input {
    width: 100%;
    padding: 12px 14px 12px 38px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    font-family: Arial, Helvetica, sans-serif;
    font-size: 14px; color: var(--text);
    background: #fafcfa; transition: all 0.2s; outline: none;
  }

  .field input:focus {
    border-color: var(--green); background: #fff;
    box-shadow: 0 0 0 4px rgba(85,201,81,0.14);
  }

  .field input::placeholder { color: #b0bdb0; }

  .toggle-pw {
    position: absolute; right: 13px; top: 50%;
    transform: translateY(-50%);
    background: none; border: none; cursor: pointer;
    color: var(--muted); padding: 0; display: flex;
  }

  /* Help row */
  .help-row {
    text-align: right;
    margin-bottom: 20px;
    margin-top: -6px;
  }

  .help-row a {
    font-size: 12.5px; color: var(--blue);
    text-decoration: none; opacity: 0.75;
  }

  .help-row a:hover { opacity: 1; text-decoration: underline; }

  /* Button */
  .btn-primary {
    width: 100%; padding: 13px;
    background: linear-gradient(135deg, var(--green), var(--green-dark));
    color: #fff; border: none;
    border-radius: var(--radius);
    font-family: Arial, Helvetica, sans-serif;
    font-size: 15px; font-weight: 700;
    cursor: pointer; transition: all 0.22s;
  }

  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 22px rgba(85,201,81,0.42);
  }

  .btn-primary:active { transform: translateY(0); }

  /* Info hint */
  .info-hint {
    margin-top: 20px;
    background: var(--green-light);
    border-radius: var(--radius);
    padding: 12px 14px;
    display: flex;
    gap: 10px;
    align-items: flex-start;
  }

  .info-hint svg { width: 16px; height: 16px; color: var(--green-dark); flex-shrink: 0; margin-top: 1px; }

  .info-hint p {
    font-size: 12.5px; color: var(--green-dark); line-height: 1.6; margin: 0;
  }

  /* Footer link */
  .card-footer {
    border-top: 1.5px solid var(--border);
    padding: 16px 32px;
    text-align: center;
  }

  .card-footer p {
    font-size: 12.5px; color: var(--muted);
  }

  .card-footer a {
    color: var(--blue); text-decoration: none; font-weight: 700; opacity: 0.85;
  }

  .card-footer a:hover { opacity: 1; text-decoration: underline; }