/* Defines CSS Custom Properties (variables) for the default (light) theme. */
:root {
    /* Color Palette */
    --bg-color: #f4f7f6;
    --container-bg: #ffffff;
    --text-primary: #333;
    --text-secondary: #666;
    --text-tertiary: #495057;
    --header-color: #0056b3;
    --accent-color: #007bff;
    --accent-hover: #0056b3;
    --success-bg: #d4edda;
    --success-text: #155724;
    --error-bg: #f8d7da;
    --error-text: #721c24;
    --border-color: #ccc;
    /* Sizing and Shadows */
    --border-light: #eee;
    --input-focus-border: #0056b3;
    --input-focus-shadow: rgba(0, 86, 179, 0.1);
    --container-shadow: rgba(0, 0, 0, 0.1);
    --radio-bg: #e9ecef;
    --radio-checked-bg: #ffffff;
    --radio-checked-text: #0056b3;
    --radio-checked-shadow: rgba(0,0,0,0.1);
    --contact-bg: #f9f9f9;
    --toggle-border: #ccc;
    --toggle-hover-bg: #f0f0f0;
}

/* Overrides the custom properties when the dark theme is active (html[data-theme='dark']). */
html[data-theme='dark'] {
    /* Dark Theme Color Palette */
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --text-tertiary: #b0b0b0;
    --header-color: #64b5f6;
    --accent-color: #42a5f5;
    --accent-hover: #64b5f6;
    --success-bg: #1e4620;
    --success-text: #c6f6d5;
    --error-bg: #5f2120;
    --error-text: #fed7d7;
    --border-color: #444;
    --border-light: #333;
    --input-focus-border: #64b5f6;
    --input-focus-shadow: rgba(100, 181, 246, 0.2);
    --container-shadow: rgba(0, 0, 0, 0.4);
    --radio-bg: #333;
    --radio-checked-bg: #42a5f5;
    --radio-checked-text: #121212;
    --radio-checked-shadow: rgba(0,0,0,0.3);
    --contact-bg: #2a2a2a;
    --toggle-border: #666;
    --toggle-hover-bg: #333;
}

/* Basic body styling and layout setup. */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s; /* Smooth transition for theme changes. */
}

/* The main content container for the application. */
.container {
    background-color: var(--container-bg);
    padding: 30px 40px;
    border-radius: 12px;
    box-shadow: 0 8px 16px var(--container-shadow);
    width: 100%;
    max-width: 600px;
    text-align: center;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s;
}

/* Flex container for the H1 and theme toggle button. */
.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

/* Header text styles. */
header h1 {
    color: var(--header-color);
    margin-top: 0;
    margin-bottom: 0;
    transition: color 0.3s;
}

header p {
    color: var(--text-secondary);
    margin-bottom: 30px;
    transition: color 0.3s;
}

/* Explanation section about the tool's purpose. */
.info-section {
    background-color: var(--radio-bg); /* Use a subtle, existing background color */
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    text-align: left;
    border: 1px solid var(--border-light);
}

.info-section h3 {
    margin-top: 0;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-size: 18px;
}

.info-section p {
    margin-bottom: 0;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.5;
}

.info-section strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* Flex container for the keyword and location input fields. */
.input-group {
    display: flex;
    gap: 15px;
}

/* General styling for text input fields. */
input[type="text"] {
    width: 100%;
    padding: 12px 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    font-size: 16px;
    transition: border-color 0.3s, box-shadow 0.3s, background-color 0.3s, color 0.3s;
    background-color: var(--bg-color);
    color: var(--text-primary);
}

/* Style for text inputs when they are focused (clicked into). */
input[type="text"]:focus {
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 3px var(--input-focus-shadow);
    outline: none;
}

.master-controls {
    /* Container for "Search All" and "Clear" buttons. */
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-light);
}

/* Warning text displayed below the "Search All" button. */
.search-all-warning {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: -10px; /* Pulls the text closer to the buttons above. */
    margin-bottom: 25px;
    max-width: 450px; /* Constrains width for better readability. */
    margin-left: auto;
    margin-right: auto;
    line-height: 1.4;
}

/* Specific colors for master control buttons. */
.search-all-button {
    background-color: #28a745; /* Green */
}

.clear-button {
    background-color: #6c757d; /* Gray */
}

.clear-button:hover {
    background-color: #5a6268;
}

/* Grid layout for the dynamically generated ATS search buttons. */
#ats-buttons-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); /* Responsive columns. */
    gap: 15px;
}

/* Base style for all primary action buttons. */
.ats-button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: background-color 0.3s;
    text-transform: capitalize;
}

.ats-button:hover {
    background-color: var(--accent-hover); /* Default hover */
}

.search-all-button:hover {
    background-color: #218838;
}

/* Styles for option groups like Region and Work Type. */
.options-group {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-top: 20px;
    margin-bottom: 30px;
}

.option-label {
    font-weight: 500;
    color: var(--text-secondary);
}

/* Container for the custom radio buttons. */
.radio-group {
    display: flex;
    background-color: var(--radio-bg);
    border-radius: 8px;
    padding: 4px;
    transition: background-color 0.3s;
}

.radio-group input[type="radio"] {
    display: none; /* Hide the default radio button */
}

/* Style for the labels that act as custom radio buttons. */
.radio-group label {
    padding: 8px 16px;
    cursor: pointer;
    border-radius: 6px;
    transition: background-color 0.3s, color 0.3s, box-shadow 0.3s, border 0.3s;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-tertiary);
}

/* Style for the selected radio button's label. */
.radio-group input[type="radio"]:checked + label {
    background-color: var(--radio-checked-bg);
    color: var(--radio-checked-text);
    box-shadow: 0 2px 4px var(--radio-checked-shadow);
}

/* Styles for the pill-shaped buttons used for geo-locations. */
.button-pills-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    flex-grow: 1; /* Allow it to take available space */
}

/* Individual pill button style. */
.pill-button {
    background-color: var(--radio-bg);
    color: var(--text-tertiary);
    border: none;
    padding: 8px 16px;
    border-radius: 16px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: background-color 0.3s, color 0.3s;
}

.pill-button:hover {
    background-color: var(--accent-color);
    color: white;
}

/* Contact Section Styles */
/* Container for the contact form. */
.contact-section {
    margin-top: 40px;
    padding: 30px;
    background-color: var(--contact-bg);
    border-radius: 10px;
    box-shadow: 0 4px 8px var(--container-shadow);
    text-align: left;
    transition: background-color 0.3s;
}

.contact-section h2 {
    color: var(--text-primary);
    margin-bottom: 15px;
    text-align: center; /* Center the heading */
}

.contact-section p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    text-align: center; /* Center the paragraph */
}

/* Styling for form groups to provide spacing. */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 5px;
    color: var(--text-primary);
}

/* Input and textarea styles specific to the contact form. */
.contact-section input[type="text"],
.contact-section input[type="email"],
.contact-section textarea {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    font-size: 16px;
    transition: border-color 0.3s, box-shadow 0.3s, background-color 0.3s, color 0.3s;
    box-sizing: border-box; /* Important for padding not to affect width */
    background-color: var(--bg-color);
    color: var(--text-primary);
}

/* Focus styles for contact form inputs. */
.contact-section input[type="text"]:focus,
.contact-section input[type="email"]:focus,
.contact-section textarea:focus {
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 2px var(--input-focus-shadow);
    outline: none;
}

.contact-section textarea {
    resize: vertical;
}

/* Submit button for the contact form. */
.contact-section .button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: background-color 0.3s;
    width: 100%;
    text-align: center;
}

.contact-section .button:hover {
    background-color: var(--accent-hover);
}

/* Container for displaying form submission status (success/error). */
#form-status {
    margin-top: 15px;
    padding: 10px;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    display: none; /* Initially hidden */
}

/* Style for a successful submission message. */
#form-status.success {
    background-color: var(--success-bg);
    color: var(--success-text);
    border: 1px solid var(--success-text);
}

/* Style for an error message. */
#form-status.error {
    background-color: var(--error-bg);
    color: var(--error-text);
    border: 1px solid var(--error-text);
}

/* Site Footer Styles */
.site-footer {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-light);
    text-align: center;
}

.site-footer p {
    margin: 0;
    font-size: 14px;
    color: var(--text-secondary);
}

.site-footer a {
    color: var(--accent-color);
    font-weight: 500;
    text-decoration: none;
    transition: color 0.3s;
}

.site-footer a:hover {
    text-decoration: underline;
    color: var(--accent-hover);
}

/* Styling for the dark mode toggle button. */
#darkModeToggle {
    background: none;
    border: 1px solid var(--toggle-border);
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
    padding: 8px 16px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    min-width: 110px; /* Prevent layout shift on text change */
    text-align: center;
}

#darkModeToggle:hover {
    background-color: var(--toggle-hover-bg);
    color: var(--text-primary);
}

/* Hide the sun icon by default (when in light mode). */
#darkModeToggle .icon-sun {
    display: none;
}

/* In dark mode, hide the moon icon... */
html[data-theme='dark'] #darkModeToggle .icon-moon {
    display: none;
}

/* ...and show the sun icon. */
html[data-theme='dark'] #darkModeToggle .icon-sun {
    display: block;
}

/* ==========================================================================
   Responsive Media Queries
   ========================================================================== */

/* Styles that apply only on screens 600px wide or smaller. */
@media (max-width: 600px) {
    body {
        padding: 15px;
        /* Align to top on mobile to prevent layout shifts with virtual keyboard */
        align-items: flex-start;
    }

    /* Reduce padding on smaller screens. */
    .container,
    .contact-section {
        padding: 20px;
    }

    /* Stack the option groups vertically instead of horizontally. */
    .options-group {
        flex-direction: column;
        gap: 10px;
    }

    /* Allow radio buttons to wrap onto multiple lines if needed. */
    .radio-group {
        flex-wrap: wrap;
        justify-content: center;
    }
}