* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

.site-header {
    background-color: teal;
    padding: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.banner-title {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: #fff;
    text-decoration: none;
    font-family: 'Trebuchet MS', sans-serif;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.banner-title:hover {
    color: #bdc3c7;
    transition: color 0.3s ease;
}

.site-container {
    margin: 0 auto;
    padding: 0 20px;
    max-width: 800px;
}

/* Mobile-first: full width on small screens */
@media (max-width: 768px) {
    .site-container {
        max-width: 100%;
        padding: 0 15px;
    }
    
    .banner-title {
        font-size: 2rem;
        letter-spacing: 1px;
    }
}

.summary {
    font-weight: bold;
}

.author {
    font-style: italic;
    color: #555;
    text-align: right;
}

.key {
    font-weight: 800;
    font-size: 1.2rem;
    margin: 1rem;
}

.single-line {
    padding: 5px;
    min-width: 10rem;
}   

.multi-line {
    padding: 10px;
    min-height: 100px;
    margin-top: 10px;
}

.auth-card {
    max-width: 480px;
    margin: 40px auto;
    padding: 24px;
    border: 1px solid #d3d7df;
    border-radius: 12px;
    background: #ffffff;
    box-shadow: 0 10px 24px rgba(44, 62, 80, 0.08);
}

.auth-card h2 {
    margin-top: 0;
}

.auth-card label {
    display: block;
    margin: 12px 0 6px;
    font-weight: 600;
}

.auth-card input {
    width: 100%;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid #ccd2db;
    font-size: 1rem;
}

.auth-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

.auth-actions button {
    padding: 10px 16px;
    border-radius: 8px;
    border: none;
    background: #2c3e50;
    color: #fff;
    cursor: pointer;
    font-weight: 600;
}

.auth-actions .ghost {
    background: transparent;
    color: #2c3e50;
    border: 1px solid #2c3e50;
}

.auth-status {
    margin-top: 16px;
    min-height: 20px;
    font-weight: 600;
}

#userIcon {
    fill: black;
}

#userIcon.signed-in {
    fill: lightgreen;
}

#userIcon:hover {
    filter: brightness(1.1);
    cursor: pointer;
}

/* Help button */
.help-button {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 2px solid #1f4f8f;
    background: transparent;
    color: #1f4f8f;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
    margin-left: 8px;
}

.help-button:hover {
    background: #f0f0f0;
}

[popover] {
    width: 300px;
    max-width: 90vw;
    padding: 16px;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    background: white;
    font-size: 14px;
    line-height: 1.5;
    margin: 0;
    top: anchor(bottom);
    left: anchor(left);
    margin-top: 8px;
}

[popover] p {
    margin: 8px 0;
}

[popover] p:first-child {
    margin-top: 0;
}

[popover] p:last-child {
    margin-bottom: 0;
}

/* Admin panel */
.admin-panel {
    max-width: 1200px;
    margin: 20px auto;
}

.admin-section {
    margin: 30px 0;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 8px;
}

.admin-section h3 {
    margin-top: 0;
}

#regoLinkForm {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 500px;
}

#regoLinkForm label {
    display: block;
    margin: 12px 0 6px;
    font-weight: 600;
}

#regoLinkForm input {
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

#regoLinkForm button {
    padding: 10px;
    background: #1f4f8f;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

#regoLinkForm button:hover {
    background: #153a5f;
}

#regoLinksTable {
    width: 100%;
    border-collapse: collapse;
}

#regoLinksTable tr {
    border-bottom: 1px solid #ddd;
}

#regoLinksTable td,
#regoLinksTable th {
    text-align: left;
    padding: 8px;
}

#regoLinksTable thead tr {
    border-bottom: 2px solid #ccc;
}

.status-pending {
    color: #0066cc;
    font-weight: bold;
}

.status-expired {
    color: #a40000;
}

.copy-button {
    padding: 4px 12px;
    background: #0066cc;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
}

.copy-button:hover {
    background: #0052a3;
}

/* Dark mode styles */
@media (prefers-color-scheme: dark) {
    body {
        background-color: #1a1a1a;
        color: #e0e0e0;
    }
    
    .site-header {
        background-color: #1a1a1a;
        border-bottom: 2px solid #444;
    }

    .summary {
        color: #e0e0e0;
    }

    .author {
        color: #b0b0b0;
    }

    .key {
        color: #e0e0e0;
    }

    .multi-line {
        background-color: #2a2a2a;
        color: #e0e0e0;
        border: 1px solid #444;
    }

    .auth-card {
        background: #1f1f1f;
        border-color: #3a3a3a;
        box-shadow: none;
    }

    .auth-card input {
        background: #2a2a2a;
        color: #e0e0e0;
        border-color: #3a3a3a;
    }

    .auth-actions button {
        background: #e0e0e0;
        color: #1a1a1a;
    }

    .auth-actions .ghost {
        background: transparent;
        color: #e0e0e0;
        border-color: #e0e0e0;
    }

    /* Admin panel dark mode */
    .admin-section {
        background-color: #2a2a2a;
        border-color: #444;
    }

    #regoLinkForm input {
        background: #1f1f1f;
        color: #e0e0e0;
        border-color: #444;
    }

    #regoLinkForm button {
        background: #0066cc;
    }

    #regoLinkForm button:hover {
        background: #0052a3;
    }

    #regoLinksTable {
        color: #e0e0e0;
    }

    #regoLinksTable thead {
        background-color: #1f1f1f;
    }

    #regoLinksTable tr {
        border-bottom-color: #444;
    }

    /* Help button dark mode */
    .help-button {
        border-color: #0066cc;
        color: #0066cc;
    }

    .help-button:hover {
        background: #333;
    }

    [popover] {
        background: #1f1f1f;
        border-color: #444;
        color: #e0e0e0;
    }
}