/* Basic Reset & Body Styling */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* -- Theme Color Variables -- */
:root {
    /* Light Theme (Default) */
    --bg-color: #f4f7f6;
    --text-color: #333;
    --header-bg-color: #2c3e50;
    --header-text-color: #ecf0f1;
    --tab-bg-color: #3498db;
    --tab-text-color: white;
    --tab-active-bg-color: #e74c3c;
    --main-bg-color: #ffffff;
    --data-group-bg-color: #ecf0f1;
    --data-group-border-color: #bdc3c7;
    --data-group-h3-color: #34495e;
    --data-group-h3-border-color: #3498db; /* Accent color for flash */
    --strong-text-color: #2c3e50;
    --span-text-color: #555;
    --span-bg-color: rgba(0,0,0,0.03);
    --button-generate-bg-color: #2ecc71;
    --button-generate-text-color: white;
    --footer-text-color: #7f8c8d;
    --shadow-color: rgba(0,0,0,0.08);
    --theme-switcher-bg: #bdc3c7;
    --theme-switcher-icon: #2c3e50;
}

body.dark-mode {
    /* Dark Theme */
    --bg-color: #212121;
    --text-color: #e0e0e0;
    --header-bg-color: #1a1a1a;
    --header-text-color: #f5f5f5;
    --tab-bg-color: #00796b;
    --tab-text-color: #eceff1;
    --tab-active-bg-color: #ff8f00;
    --main-bg-color: #2c2c2c;
    --data-group-bg-color: #383838;
    --data-group-border-color: #4f4f4f;
    --data-group-h3-color: #b0bec5;
    --data-group-h3-border-color: #00acc1; /* Accent color for flash in dark mode */
    --strong-text-color: #eceff1;
    --span-text-color: #b0bec5;
    --span-bg-color: rgba(255,255,255,0.05);
    --button-generate-bg-color: #00897b;
    --button-generate-text-color: #ffffff;
    --footer-text-color: #9e9e9e;
    --shadow-color: rgba(0,0,0,0.25);
    --theme-switcher-bg: #424242;
    --theme-switcher-icon: #e0e0e0;
}


body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
    padding: 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* --- Theme Switcher --- */
.theme-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    background-color: var(--theme-switcher-bg);
    color: var(--theme-switcher-icon);
    border: none;
    padding: 10px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.5em;
    z-index: 1000;
    box-shadow: 0 2px 5px var(--shadow-color);
    transition: background-color 0.3s ease, color 0.3s ease, transform 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
}
.theme-switcher:hover {
    transform: scale(1.1);
}


/* Header & Navigation */
header {
    background-color: var(--header-bg-color);
    color: var(--header-text-color);
    padding: 25px 0;
    text-align: center;
    margin-bottom: 35px;
    border-radius: 10px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

header h1 {
    font-family: 'Poppins', sans-serif;
    margin-bottom: 20px;
    font-size: 2.8em;
    letter-spacing: 1px;
    font-weight: 600;
}

header nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

.tab-button {
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    background-color: var(--tab-bg-color);
    color: var(--tab-text-color);
    border: none;
    padding: 12px 22px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 1em;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.tab-button:hover {
    opacity: 0.85;
    transform: translateY(-2px);
}

.tab-button.active {
    background-color: var(--tab-active-bg-color);
    font-weight: 600;
    box-shadow: 0 3px 6px var(--shadow-color);
}

/* Main Content & Sections */
main {
    max-width: 950px;
    margin: 0 auto;
    background-color: var(--main-bg-color);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 20px var(--shadow-color);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.data-generator-section {
    display: none;
    animation: sectionFadeIn 0.6s ease-in-out;
}

.data-generator-section.active {
    display: block;
}

.data-generator-section h2 {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    color: var(--strong-text-color);
    margin-bottom: 25px;
    text-align: center;
    font-size: 2em;
    transition: color 0.3s ease;
}

.generated-data {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.data-group {
    background-color: var(--data-group-bg-color);
    padding: 25px;
    border-radius: 8px;
    border: 1px solid var(--data-group-border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}
.data-group:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 12px var(--shadow-color);
}


.data-group h3 {
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    color: var(--data-group-h3-color);
    margin-bottom: 18px;
    font-size: 1.3em;
    border-bottom: 2px solid var(--data-group-h3-border-color);
    padding-bottom: 8px;
    transition: color 0.3s ease, border-color 0.3s ease;
}

.data-group p {
    margin-bottom: 12px;
    font-size: 1em;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.data-group p strong {
    color: var(--strong-text-color);
    font-weight: 600;
    margin-right: 10px;
    transition: color 0.3s ease;
    white-space: nowrap;
}

.data-group span {
    color: var(--span-text-color);
    background-color: var(--span-bg-color);
    padding: 4px 8px;
    border-radius: 4px;
    display: inline-block;
    min-width: 100px;
    text-align: right;
    transition: color 0.3s ease, background-color 0.3s ease, transform 0.1s ease;
    word-break: break-all;
    flex-grow: 1;
}

/* Data update animation */
.data-updated {
    animation: dataFlash 0.7s ease-out;
}

@keyframes dataFlash {
    0% { transform: scale(1.05) translateX(2px); background-color: var(--data-group-h3-border-color); opacity: 0.7; }
    30% { transform: scale(1) translateX(0); background-color: var(--span-bg-color); opacity: 1; }
    100% { background-color: var(--span-bg-color); opacity: 1; }
}


/* Buttons */
.generate-button {
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    display: block;
    background-color: var(--button-generate-bg-color);
    color: var(--button-generate-text-color);
    border: none;
    padding: 14px 30px;
    font-size: 1.15em;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease, transform 0.2s ease, box-shadow 0.2s ease;
    margin: 25px auto 0;
    box-shadow: 0 2px 4px var(--shadow-color);
}

.generate-button:hover {
    opacity: 0.9;
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.generate-button:active {
    transform: translateY(0) scale(1);
    box-shadow: 0 2px 4px var(--shadow-color);
}

/* Disclaimers */
.disclaimer {
    font-size: 0.85em !important;
    color: var(--footer-text-color) !important;
    opacity: 0.9;
    font-style: italic;
    margin-top: 12px !important;
    display: block;
    width: 100%;
    text-align: left;
    transition: color 0.3s ease;
}

/* Footer */
footer {
    text-align: center;
    margin-top: 45px;
    padding-top: 25px;
    border-top: 1px solid var(--data-group-border-color);
    color: var(--footer-text-color);
    font-size: 0.9em;
    transition: color 0.3s ease, border-color 0.3s ease;
}

/* Animation for section transitions */
@keyframes sectionFadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}