@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,400;0,600;0,700;1,400;1,600;1,700&display=swap');

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

:root {
    /* The Data City Brand Colors - Exact from their site */
    --tdc-blue: #0693E3;
    --tdc-blue-dark: #0277BD;
    --tdc-purple: #9B51E0;
    --tdc-dark: #1D1D1D;
    --tdc-dark-gray: #4A4A4A;
    --tdc-gray: #8E8E8E;
    --tdc-light-gray: #E5E5E5;
    --tdc-bg: #FAFAFA;
    --tdc-white: #FFFFFF;

    /* Typography - Adjusted for data dictionary readability */
    --font-size-small: 12px;
    --font-size-base: 14px;
    --font-size-medium: 16px;
    --font-size-large: 20px;
    --font-size-xlarge: 28px;

    /* Font weights */
    --font-weight-normal: 400;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Light theme (default) */
    --bg-primary: var(--tdc-bg);
    --bg-secondary: var(--tdc-white);
    --text-primary: var(--tdc-dark);
    --text-secondary: var(--tdc-dark-gray);
    --border-color: var(--tdc-light-gray);
    --shadow-color: rgba(0, 0, 0, 0.06);
    --shadow-hover: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    /* Dark theme */
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --text-primary: #F1F5F9;
    --text-secondary: #CBD5E1;
    --border-color: #334155;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --shadow-hover: rgba(0, 0, 0, 0.4);
}

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Theme Toggle */
.theme-toggle {
    padding: 10px 14px;
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: var(--font-size-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    width: 44px;
    height: 44px;
}

.theme-toggle:hover {
    background: var(--bg-secondary);
    border-color: var(--tdc-blue);
}

.theme-icon {
    transition: transform 0.3s ease;
}

/* Top Navigation */
.top-nav {
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px var(--shadow-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    height: 40px;
    width: auto;
    display: block;
}

.top-nav h1 {
    font-size: var(--font-size-medium);
    font-weight: var(--font-weight-bold);
    margin: 0;
    letter-spacing: -0.02em;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 32px 24px;
}

header {
    background: var(--bg-secondary);
    padding: 32px;
    margin-bottom: 24px;
    border-radius: 16px;
    box-shadow: 0 2px 8px var(--shadow-color);
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

header h1 {
    font-size: var(--font-size-xlarge);
    margin-bottom: 16px;
    color: var(--text-primary);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.02em;
    line-height: 1.2;
    transition: color 0.3s ease;
}

.subtitle {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    transition: color 0.3s ease;
}

.controls {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    align-items: center;
}

input, select {
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: var(--font-size-base);
    font-family: 'Poppins', sans-serif;
    font-weight: var(--font-weight-normal);
    transition: all 0.2s ease;
    background: var(--bg-secondary);
    color: var(--text-primary);
}

select {
    padding-right: 32px;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%23666' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}

input[type="text"] {
    flex: 1;
    min-width: 250px;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--tdc-blue);
    box-shadow: 0 0 0 4px rgba(6, 147, 227, 0.1);
}

button {
    padding: 10px 20px;
    background: var(--tdc-blue);
    color: var(--tdc-white);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    font-family: 'Poppins', sans-serif;
    transition: all 0.2s ease;
    letter-spacing: 0.01em;
}

button:hover {
    background: var(--tdc-blue-dark);
    box-shadow: 0 6px 20px rgba(6, 147, 227, 0.3);
}

button:active {
    background: var(--tdc-blue-dark);
}

button.secondary {
    background: var(--tdc-gray);
    color: var(--tdc-white);
    font-weight: var(--font-weight-semibold);
}

button.secondary:hover {
    background: var(--tdc-dark-gray);
}

.results-info {
    margin-bottom: 20px;
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    transition: color 0.3s ease;
}

.fields-grid {
    display: grid;
    gap: 24px;
}

.field-card {
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: 16px;
    box-shadow: 0 2px 8px var(--shadow-color);
    transition: all 0.3s ease;
}

.field-card:hover {
    box-shadow: 0 8px 24px var(--shadow-hover);
}

.field-name {
    font-size: var(--font-size-large);
    font-weight: var(--font-weight-bold);
    margin-bottom: 12px;
    color: var(--tdc-blue);
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.field-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 16px;
}

.meta-item {
    font-size: var(--font-size-small);
}

.meta-label {
    font-weight: var(--font-weight-semibold);
    color: var(--text-secondary);
    display: block;
    margin-bottom: 8px;
    font-size: var(--font-size-small);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    transition: color 0.3s ease;
}

.meta-value {
    color: var(--text-primary);
    word-break: break-word;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
    transition: color 0.3s ease;
}

.description {
    font-size: var(--font-size-base);
    line-height: 1.75;
    color: var(--text-secondary);


    transition: color 0.3s ease;
}

.field-extra {
    font-size: var(--font-size-small);
    padding: 12px 16px;
    background: var(--bg-primary);
    border-radius: 10px;
    margin-top: 12px;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.field-extra strong {
    color: var(--tdc-blue);
    margin-right: 8px;
    font-weight: var(--font-weight-semibold);
}

.field-link {
    font-size: var(--font-size-base);
    margin-top: 16px;
}

.field-link a {
    color: var(--tdc-blue);
    text-decoration: none;
    font-weight: var(--font-weight-semibold);
    transition: color 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.field-link a:hover {
    color: var(--tdc-purple);
    text-decoration: underline;
}

.no-results {
    background: var(--bg-secondary);
    padding: 60px 32px;
    text-align: center;
    border-radius: 16px;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    font-size: var(--font-size-base);
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.export-buttons {
    display: flex;
    gap: 12px;
    margin-left: auto;
}

.loading {
    background: var(--bg-secondary);
    padding: 60px 32px;
    text-align: center;
    border-radius: 16px;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    font-size: var(--font-size-base);
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--tdc-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: 12px;
    vertical-align: middle;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error {
    background: #FEF2F2;
    color: #DC2626;
    padding: 14px;
    border-radius: 10px;
    margin-bottom: 20px;
    border-left: 5px solid #DC2626;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
}

[data-theme="dark"] .error {
    background: #7F1D1D;
    color: #FCA5A5;
    border-left-color: #FCA5A5;
}

.success {
    background: #F0FDF4;
    color: #16A34A;
    padding: 14px;
    border-radius: 10px;
    margin-bottom: 20px;
    border-left: 5px solid #16A34A;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-base);
}

[data-theme="dark"] .success {
    background: #14532D;
    color: #86EFAC;
    border-left-color: #86EFAC;
}

/* Nested Field Styles */
details.field-card {
    padding: 0;
}

details.field-card summary {
    padding: 20px 24px;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: var(--font-weight-semibold);
    color: var(--tdc-blue);
    font-size: var(--font-size-large);
    transition: background-color 0.2s ease;
    border-radius: 16px;
}

details.field-card[open] summary {
    border-bottom: 1px solid var(--border-color);
    border-radius: 16px 16px 0 0;
    margin-bottom: 0;
}

details.field-card summary:hover {
    background: rgba(0,0,0,0.02);
}

details.field-card summary::-webkit-details-marker {
    display: none;
}

.schema-badge {
    font-size: var(--font-size-small);
    background: var(--tdc-light-gray);
    color: var(--tdc-dark-gray);
    padding: 4px 8px;
    border-radius: 4px;
    font-weight: var(--font-weight-normal);
    letter-spacing: 0.02em;
    margin-left: 12px;
    vertical-align: middle;
}

[data-theme="dark"] .schema-badge {
    background: var(--border-color);
    color: var(--text-secondary);
}

.toggle-icon {
    font-size: 1.2em;
    color: var(--tdc-gray);
    transition: transform 0.3s ease;
}

details[open] .toggle-icon {
    transform: rotate(180deg);
}

.nested-content {
    padding: 24px;
    animation: slideDown 0.2s ease-out;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    .container {
        padding: 24px 16px;
    }

    header {
        padding: 24px 20px;
    }

    header h1 {
        font-size: var(--font-size-xlarge);
    }

    .top-nav h1 {
        font-size: var(--font-size-medium);
    }

    .subtitle {
        font-size: var(--font-size-small);
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    input[type="text"] {
        min-width: 100%;
    }

    .export-buttons {
        margin-left: 0;
        width: 100%;
        flex-direction: column;
    }

    .export-buttons button {
        width: 100%;
    }

    .nav-container {
        padding: 0 16px;
    }


    .field-card {
        padding: 20px;
    }

    .field-meta {
        grid-template-columns: 1fr;
    }
}