:root {
    --button-background-color: var(--header-title-color);
    --button-color: white;
    --button-disabled-color: #6c757d;
    --button-font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --button-font-size: 14px;
    --button-padding: 12px 24px;
    --button-border-radius: 6px;
    --button-transition: all 0.3s ease;

    --body-color: #f8f9fa;
    --body-font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --body-font-size: 16px;
    --body-line-height: 1.6;

    --content-width: 1200px;
    --content-padding: 40px 20px;

    --dialog-max-width: min(600px, 90vw);
    --dialog-max-height: 85vh;

    --gap: 16px;
    --section-gap: 32px;
    --container-gap: 48px;

    --invalid-color: #dc3545;
    --success-color: #28a745;
    --contrast-color: #ffc107;
    --info-color: #17a2b8;

    --header-title-color: #2c3e50;
    --title-font-size: 42px;
    --title-font: Times;

    --header-border: var(--header-border-width) solid var(--header-border-color);
    --header-border-color: #e9ecef;
    --header-border-width: 1px;
    --header-color: white;
    --header-height: 80px;
    --header-padding: 16px 24px;
    --header-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);

    --card-background: white;
    --card-border: 1px solid #e9ecef;
    --card-border-radius: 8px;
    --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --card-padding: 24px;

    --table-border: 1px solid #dee2e6;
    --table-header-bg: #f8f9fa;
    --table-hover-bg: #f8f9fa;

    --input-border: 1px solid #ced4da;
    --input-border-radius: 6px;
    --input-padding: 12px 16px;
    --input-focus-border: 1px solid var(--contrast-color);
}

* {
    box-sizing: border-box;
}

body {
    background-color: var(--body-color);
    font-family: var(--body-font-family);
    font-size: var(--body-font-size);
    line-height: var(--body-line-height);
    margin: 0;
    padding: 0;
    overflow-y: scroll;
}

/* Header Styles */
header {
    background-color: var(--header-color);
    border-bottom: var(--header-border);
    box-shadow: var(--header-shadow);
    display: flex;
    justify-content: space-between;
    height: var(--header-height);
    left: 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.header-left {
    display: flex;
    padding-left: var(--gap);
    gap: var(--gap);
    align-items: end;
}

.header-right {
    display: flex;
    gap: var(--gap);
    align-items: center;
    justify-content: space-between;
    padding-right: var(--gap);
}

#title {
    user-select: none;
    color: color-mix(in srgb, var(--header-color) 75%, var(--header-title-color));
    font-size: var(--title-font-size);
    font-family: var(--title-font);
    /*margin: auto auto 0 0;*/
}

/* Main Content */
main {
    margin: 0 auto;
    max-width: var(--content-width);
    padding: var(--content-padding);
    padding-top: calc(var(--header-height) + 40px);
}

/* Button Styles */
button, a.button, input[type=submit] {
    background: var(--button-background-color);
    border: none;
    border-radius: var(--button-border-radius);
    color: var(--button-color);
    cursor: pointer;
    font-family: var(--button-font-family);
    font-size: var(--button-font-size);
    font-weight: 500;
    padding: var(--button-padding);
    text-decoration: none;
    transition: var(--button-transition);
    min-width: 100px;

    user-select: none;

    line-height: normal;
    display: flex;
    align-items: center;
    justify-content: center;
}

button:hover, a.button:hover, input[type=submit]:hover {
    color: var(--contrast-color);
    text-decoration: underline;
}

a:hover {
    color: var(--contrast-color);
    text-decoration: underline;
}

button:disabled, input[type=submit]:disabled {
    background-color: var(--button-disabled-color);
    cursor: not-allowed;
    color: var(--button-color);
    transform: none;
    text-decoration: none;
    box-shadow: none;
}

.label {
    text-align: right;
    font-weight: 600;
    padding: 8px 16px 8px 0;
    color: var(--title-color);
}

.nice-label {
    width: 16em;
}

input[type="text"], input[type="email"], input[type="password"], 
input[type="number"], input[type="date"], select, textarea {
    border: var(--input-border);
    border-radius: var(--input-border-radius);
    padding: var(--input-padding);
    font-family: var(--body-font-family);
    font-size: var(--body-font-size);
    min-width: 17em;
}

input[type="text"]:focus, input[type="email"]:focus, input[type="password"]:focus,
input[type="number"]:focus, input[type="date"]:focus, select:focus, textarea:focus {
    border: var(--input-focus-border);
    outline: none;
}

.invalid {
    color: var(--invalid-color);
    font-size: 14px;
    margin-top: 4px;
    font-weight: 500;
}

/* Table Styles */
table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-background);
    border: var(--card-border);
    border-radius: var(--card-border-radius);
    box-shadow: var(--card-shadow);
    margin-bottom: var(--section-gap);
    overflow: hidden;
}

table th {
    background-color: var(--table-header-bg);
    color: var(--header-title-color);
    font-weight: 600;
    padding: 16px;
    text-align: left;
    border-bottom: var(--table-border);
}

table td {
    padding: 16px;
    border-bottom: var(--table-border);
    vertical-align: middle;
}

table tr:hover {
    background-color: var(--table-hover-bg);
}

table tr:last-child td {
    border-bottom: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--header-title-color);
    font-weight: 600;
    margin-bottom: var(--gap);
    margin-top: 0;
}

h1 {
    border-bottom: 3px solid var(--contrast-color);
    margin-bottom: var(--section-gap);
    padding-bottom: 16px;
}

h2, h3, h4, h5, h6 {
    border-bottom: 1px solid color-mix(in srgb, var(--button-disabled-color) 50%, var(--body-color));
}

h2 {
    margin-bottom: var(--gap);
}

p {
    margin-bottom: var(--gap);
}

/* Links */
a {
    color: var(--header-title-color);
    transition: color 0.3s ease;
}

/* Dialog Styles */
dialog {
    max-width: var(--dialog-max-width);
    max-height: var(--dialog-max-height);
    border: var(--card-border);
    border-radius: var(--card-border-radius);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    padding: 0;
    overflow: hidden;
}

dialog::backdrop {
    background-color: rgba(0, 0, 0, 0.5);
}

.login-dialog {
    min-width: 400px;
}

.dialog-header {
    background-color: var(--header-title-color);
    color: white;
    padding: 20px var(--card-padding);
    margin: 0;
}

.login-dialog form {
    margin: 0;
    border: none;
    box-shadow: none;
}

.dialog-footer {
    padding: 16px var(--card-padding);
    background-color: #f8f9fa;
    border-top: 1px solid #e9ecef;
}

/* Alert Messages */
.alert {
    padding: 16px 20px;
    margin-bottom: var(--gap);
    border-radius: var(--card-border-radius);
    font-weight: 500;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* Grid Layout for Forms */
.form-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--gap);
    align-items: center;
}

/* Form Components */
.checkbox-item, .radio-item {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.checkbox-item input[type="checkbox"], .radio-item input[type="radio"] {
    width: auto;
    margin: 0;
}

.checkbox-item label, .radio-item label {
    font-weight: 500;
    color: var(--header-title-color);
    cursor: pointer;
}

.form-section {
    margin-bottom: var(--section-gap);
}

.radio-group {
    margin-bottom: 16px;
}

.email-input {
    margin-top: 8px;
    margin-left: 24px;
}

.help-text {
    color: #6c757d;
    font-style: italic;
    margin-top: 12px;
    padding: 12px;
    background-color: #f8f9fa;
    border-radius: var(--input-border-radius);
    border-left: 4px solid var(--contrast-color);
}

.form-actions {
    padding-top: var(--gap);
    border-top: 1px solid #e9ecef;
    display: flex;
    gap: var(--gap);
}

summary {
    cursor: pointer;
}

summary:hover * {
    color: var(--contrast-color) !important;
}

.inline-form {
    margin: 0;
    padding: 0;
    border: none;
    box-shadow: none;
    background: none;
}

/* Signature Form */
.signature-form {
    margin: 0;
    padding: 0;
    border: none;
    box-shadow: none;
    background: none;
}

.signature-grid {
    padding: 2em;
    display: grid;
    gap: 1em;
    align-items: end;
    justify-content: center;
    grid-template-columns: max-content max-content max-content;
    margin-bottom: 2em;
}

.signature-grid span {
    font-weight: 500;
    color: var(--header-title-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --content-padding: 20px 16px;
        --card-padding: 16px;
        --section-gap: 24px;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
        gap: 8px;
    }
    
    .label {
        text-align: left;
        width: auto;
        padding: 8px 0;
    }
    
    header {
        padding: 12px 16px;
    }
    
    #title {
        font-size: 20px;
    }
    
    button, a.button, input[type=submit] {
        width: 100%;
        margin-bottom: 8px;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.mb-0 {
    margin-bottom: 0;
}

.mt-0 {
    margin-top: 0;
}

.container {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Card Component */
.card {
    background: var(--card-background);
    border: var(--card-border);
    border-radius: var(--card-border-radius);
    box-shadow: var(--card-shadow);
    padding: var(--card-padding);
    margin-bottom: var(--section-gap);
}

.card-header {
    border-bottom: 1px solid #e9ecef;
    padding-bottom: 16px;
    margin-bottom: 20px;
}

.card-content {
    padding: var(--card-padding);
}

/* Details/Spoiler Styling */
details {
    border: none;
}

details summary {
    cursor: pointer;
    padding: 0;
    margin: 0;
    list-style: none;
}

details summary::-webkit-details-marker {
    display: none;
}

details summary:hover {
    color: var(--contrast-color);
}

/* Footer Styles */
.footer {
    background-color: var(--header-title-color);
    color: white;
    padding: 24px 0;
    margin-top: var(--container-gap);
    text-align: center;
}

.footer p {
    margin: 0;
    color: white;
}