:root {
    --bg: #f0f4f9;
    --card: #ffffff;
    --text: #1f1f1f;
    --muted: #444746;
    --line: #747775;
    --accent: #0b57d0;
    --accent-text: #ffffff;
    --error: #b3261e;
    --ease: cubic-bezier(.2, 0, 0, 1);
    color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #131314;
        --card: #1e1f20;
        --text: #e3e3e3;
        --muted: #c4c7c5;
        --line: #8e918f;
        --accent: #a8c7fa;
        --accent-text: #062e6f;
        --error: #f2b8b5;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    background: var(--bg);
    color: var(--text);
    font-family: "Google Sans", Roboto, system-ui, -apple-system, sans-serif;
    padding: 16px;
}

.card {
    width: 100%;
    max-width: 420px;
    background: var(--card);
    border-radius: 28px;
    padding: 40px 36px 36px;
    animation: arrive .6s var(--ease) both;
}

@keyframes arrive {
    from { opacity: 0; transform: translateY(20px) scale(.97); }
    to { opacity: 1; transform: none; }
}

.logo { display: block; margin-bottom: 16px; }

h1 { font-size: 32px; font-weight: 400; margin: 0 0 8px; }
.sub { margin: 0 0 32px; color: var(--muted); font-size: 15px; }

.field { position: relative; display: block; }
.field input {
    width: 100%;
    height: 56px;
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 0 16px;
    font: inherit;
    font-size: 16px;
    background: transparent;
    color: var(--text);
    outline: none;
}
.field input:focus { border: 2px solid var(--accent); padding: 0 15px; }
.field span {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    padding: 0 4px;
    background: var(--card);
    color: var(--muted);
    pointer-events: none;
    transition: all .2s var(--ease);
}
.field input:focus + span,
.field input:not(:placeholder-shown) + span {
    top: 0;
    font-size: 12px;
    color: var(--accent);
}

.error { color: var(--error); font-size: 13px; min-height: 18px; margin: 8px 0 0; }

.primary {
    margin-top: 16px;
    float: right;
    height: 40px;
    padding: 0 24px;
    border: 0;
    border-radius: 20px;
    background: var(--accent);
    color: var(--accent-text);
    font: inherit;
    font-weight: 500;
    cursor: pointer;
    transition: transform .2s var(--ease);
}
.primary:active { transform: scale(.95); }
.primary:disabled { opacity: .6; }

form::after { content: ""; display: block; clear: both; }

/* Falsches Passwort: das Feld schüttelt den Kopf */
.shake .field { animation: shake .45s var(--ease); }
@keyframes shake {
    0%, 100% { transform: none; }
    20% { transform: translateX(-10px); }
    40% { transform: translateX(8px); }
    60% { transform: translateX(-5px); }
    80% { transform: translateX(3px); }
}

.divider {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--muted);
    font-size: 13px;
    margin: 28px 0 20px;
}
.divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: color-mix(in srgb, var(--line) 50%, transparent); }

.google {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 22px;
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: transform .2s var(--ease);
}
.google:hover { background: color-mix(in srgb, var(--accent) 8%, transparent); }
.google:active { transform: scale(.97); }

@media (prefers-reduced-motion: reduce) {
    .card, .shake .field { animation: none; }
}

[hidden] { display: none !important; }