acht-damen-tuerme-problem/app/static/css/login.css

:root {
    --nav-bg-color: #172033;
    --panel-bg-color: rgba(255, 255, 255, 0.18);
    --panel-border-color: rgba(255, 255, 255, 0.24);
    --text-color: #172033;
    --muted-text-color: #475569;
    --success-color: #15803d;
    --info-color: #1d4ed8;
    --error-color: #b91c1c;
}

@font-face {
    font-family: "Geist Sans";
    src: url("https://assets.codepen.io/605876/GeistVF.ttf") format("truetype");
}

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

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text-color);
    font-family: "Geist Sans", system-ui, sans-serif;
    background:
        radial-gradient(circle at top left, rgba(255, 255, 255, 0.45), transparent 32%),
        linear-gradient(135deg, #d2ecff 0%, #b8c6db 48%, #7f8ea3 100%);
}

nav {
    width: 100%;
    min-height: 68px;
    padding: 15px 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    background: var(--nav-bg-color);
}

nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

nav a {
    color: white;
    text-decoration: none;
    font-size: 16px;
}

nav a:hover {
    color: #93c5fd;
}

.nav-form {
    margin: 0;
    padding: 0;
    width: auto;
    background: none;
    border: 0;
    box-shadow: none;
    backdrop-filter: none;
}

.nav-button {
    margin: 0;
    padding: 0;
    background: none;
    border: 0;
    color: white;
    font: inherit;
    cursor: pointer;
}

.nav-button:hover {
    transform: none;
    box-shadow: none;
    color: #93c5fd;
}

.auth-shell {
    min-height: calc(100vh - 68px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px 16px;
}

.settings-shell {
    align-items: flex-start;
}

.auth-panel {
    width: min(420px, 100%);
    padding: 34px;
    border-radius: 20px;
    background: var(--panel-bg-color);
    border: 1px solid var(--panel-border-color);
    backdrop-filter: blur(16px);
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.18);
    animation: fadeIn 0.8s ease;
}

.settings-panel {
    width: min(900px, 100%);
}

.settings-grid {
    display: grid;
    gap: 24px;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1,
h2 {
    margin-top: 0;
}

.muted {
    margin: 0 0 20px;
    color: var(--muted-text-color);
    line-height: 1.5;
}

form {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 18px;
    padding: 24px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.22);
}

label {
    margin-top: 8px;
    font-size: 14px;
    font-weight: 600;
}

input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid rgba(71, 85, 105, 0.25);
    border-radius: 10px;
    font: inherit;
    background: rgba(255, 255, 255, 0.86);
    color: var(--text-color);
}

input:focus {
    outline: 2px solid rgba(59, 130, 246, 0.35);
    border-color: rgba(59, 130, 246, 0.5);
}

.field-hint {
    margin: 0;
    font-size: 13px;
    color: var(--muted-text-color);
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 10px 0 6px;
}

.checkbox-row input {
    width: auto;
}

button {
    margin-top: 14px;
    padding: 12px 16px;
    border: none;
    border-radius: 10px;
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    color: #172033;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.18);
}

button:active {
    transform: scale(0.98);
}

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.button-row button {
    flex: 1 1 160px;
}

.secondary-button {
    background: linear-gradient(135deg, #e2e8f0, #cbd5e1);
}

.message {
    margin: 0 0 14px;
    padding: 12px 14px;
    border-radius: 10px;
    font-size: 14px;
}

.message.error {
    color: var(--error-color);
    background: rgba(254, 226, 226, 0.92);
}

.message.success {
    color: var(--success-color);
    background: rgba(220, 252, 231, 0.92);
}

.message.info {
    color: var(--info-color);
    background: rgba(219, 234, 254, 0.92);
}

.qr-panel {
    display: flex;
    justify-content: center;
    margin: 8px 0 6px;
    padding: 18px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.38);
    border: 1px solid rgba(255, 255, 255, 0.24);
}

.qr-code {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 220px;
    min-height: 220px;
    padding: 10px;
    border-radius: 14px;
    background: #ffffff;
    color: var(--muted-text-color);
    text-align: center;
}

.qr-code img {
    display: block;
}

@media (max-width: 640px) {
    nav {
        padding: 16px 20px;
        flex-direction: column;
        align-items: flex-start;
    }

    .auth-shell {
        padding: 20px 12px 28px;
    }

    .auth-panel {
        padding: 24px 18px;
    }

    form {
        padding: 18px;
    }
}