/* =========================================================
   General Reset & Theme
   ========================================================= */

* {
    box-sizing: border-box;
}

:root {
    /* Light theme defaults */
    --page-bg: #f8f9fa;
    --main-bg: #ffffff;
    --text: #333333;
    --heading: #003366;
    --accent: #0056b3;
    --border: #dddddd;
    --table-alt: #f2f2f2;
    --tab-bg: #e9ecef;
    --tab-text: #555555;
    --tab-hover: #dee2e6;
    --shadow: rgba(0, 0, 0, 0.1);
    --iframe-filter: none;
    --image-opacity: 1;
}

/* Follow the operating system/browser preference by default */
@media (prefers-color-scheme: dark) {
    :root {
        --page-bg: #121212;
        --main-bg: #1e1e1e;
        --text: #e0e0e0;
        --heading: #90caf9;
        --accent: #64b5f6;
        --border: #444444;
        --table-alt: #2a2a2a;
        --tab-bg: #2a2a2a;
        --tab-text: #bbbbbb;
        --tab-hover: #333333;
        --shadow: rgba(0, 0, 0, 0.5);
        --iframe-filter: invert(0.9) hue-rotate(180deg);
        --image-opacity: 0.8;
    }
}

/*
 * Manual theme overrides.
 *
 * If data-theme is absent, prefers-color-scheme determines the theme.
 * If data-theme="light" or data-theme="dark" is present, it wins.
 */

html[data-theme="light"] {
    --page-bg: #f8f9fa;
    --main-bg: #ffffff;
    --text: #333333;
    --heading: #003366;
    --accent: #0056b3;
    --border: #dddddd;
    --table-alt: #f2f2f2;
    --tab-bg: #e9ecef;
    --tab-text: #555555;
    --tab-hover: #dee2e6;
    --shadow: rgba(0, 0, 0, 0.1);
    --iframe-filter: none;
    --image-opacity: 1;
}

html[data-theme="dark"] {
    --page-bg: #121212;
    --main-bg: #1e1e1e;
    --text: #e0e0e0;
    --heading: #90caf9;
    --accent: #64b5f6;
    --border: #444444;
    --table-alt: #2a2a2a;
    --tab-bg: #2a2a2a;
    --tab-text: #bbbbbb;
    --tab-hover: #333333;
    --shadow: rgba(0, 0, 0, 0.5);
    --iframe-filter: invert(0.9) hue-rotate(180deg);
    --image-opacity: 0.8;
}


/* =========================================================
   Base Styles
   ========================================================= */

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--page-bg);
    margin: 0;
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;
}

#mainframe {
    max-width: 900px;
    margin: 0 auto;
    background: var(--main-bg);
    padding: 40px;
    box-shadow: 0 4px 6px var(--shadow);
    border-radius: 8px;
    transition: background-color 0.3s, box-shadow 0.3s;
}


/* =========================================================
   Typography
   ========================================================= */

h1.title {
    color: var(--heading);
    border-bottom: 2px solid var(--heading);
    padding-bottom: 10px;
    margin-top: 0;
    margin-block-end: 0;
}

h2 {
    color: var(--accent);
    border-left: 5px solid var(--accent);
    padding-left: 15px;
    margin-block-start: 0;
    margin-block-end: 0;
}

h3 {
    color: var(--text);
    margin-top: 5px;
    margin-block-start: 0;
    margin-block-end: 0;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

hr {
    border: 1px solid var(--heading);
}


/* =========================================================
   Tables
   ========================================================= */

table {
    width: 100%;
    border-collapse: collapse;
    margin: 0;
}

td {
    padding: 0;
    vertical-align: top;
}

table[align="right"],
h3 + table {
    font-size: 0.9em;
}

table[align="right"] tr:nth-child(even) {
    background: var(--table-alt);
}


/* =========================================================
   Responsive Images and Embeds
   ========================================================= */

img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    opacity: var(--image-opacity);
    transition: opacity 0.3s;
}

img:hover {
    opacity: 1;
}

embed,
iframe {
    max-width: 100%;
    border: 1px solid var(--border);
    filter: var(--iframe-filter);
}


/* =========================================================
   Tabs
   ========================================================= */

.tabs-container {
    margin-top: 30px;
    display: flex;
    flex-wrap: wrap;
}

/* Hide radio buttons */
.tab-input {
    display: none;
}

/* Tab labels */
.tab-label {
    padding: 12px 20px;
    cursor: pointer;
    background: var(--tab-bg);
    margin-right: 4px;
    border-radius: 8px 8px 0 0;
    color: var(--tab-text);
    transition: all 0.3s ease;
}

.tab-label:hover {
    background: var(--tab-hover);
}

/* Active tab */
.tab-input:checked + .tab-label {
    background: var(--accent);
    color: white;
}

/* Tab panel */
.tab-panel {
    display: none;
    width: 100%;
    padding: 20px;
    border: 1px solid var(--border);
    background: var(--main-bg);
    border-radius: 0 0 8px 8px;
    order: 99;
}

.tab-input:checked + .tab-label + .tab-panel {
    display: block;
}


/* =========================================================
   JavaScript-Controlled Tabs
   ========================================================= */

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.tabs {
    display: flex;
    gap: 0;
    padding: 0;
    margin: 0;
    border-bottom: 2px solid var(--heading);
    background: var(--tab-bg);
}

.toggle-button {
    font-size: 1em;
    padding: 0px 5px;
    background: var(--tab-bg);
    color: var(--tab-text);
}

.tab-button {
    margin: 0;
    border: none;
    border-right: 1px solid var(--border);
    padding: 10px 16px;
    background: var(--tab-bg);
    color: var(--tab-text);
    cursor: pointer;
    font-weight: bold;
    font-size: 1.2em;
}

.tab-button:last-child {
    border-right: none;
}

.tab-button.active {
    background: #007bff;
    color: white;
}


/* =========================================================
   Footer / Last Updated
   ========================================================= */

#content > br + a[name="bottom"],
#content > b {
    font-size: 0.85em;
    color: var(--text);
    opacity: 0.7;
}


/* =========================================================
   Lists
   ========================================================= */

ul {
    padding-inline-start: 40px;
    margin-block-start: 0;
    margin-block-end: 0;
    list-style-type: "\21B3  ";
}

ul.search-items {
    padding-left: 20px;
    padding-bottom: 10px;
}

ul.search-items li {
    list-style-type: "";
    line-height:1.2;
}

ul.search-items li::before {
    content: "\2315";
    font-size: 1.8em;
    display: inline-block;
    transform: translateY(3px);
    margin-right: 4px;
}


/* =========================================================
   Line Container
   ========================================================= */

.line-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}


/* =========================================================
   Mobile Optimization
   ========================================================= */

@media (max-width: 768px) {

    #mainframe {
        padding: 20px;
    }

    /* Stack profile table columns */
    table,
    tbody,
    tr,
    td {
        display: block;
        width: 100%;
    }

    td {
        padding: 5px 0;
    }

    /* Center profile image on mobile */
    td img {
        display: block;
        margin: 0 auto 15px;
    }

    /* Allow data tables to scroll horizontally */
    h3 + table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }

    .tab-label {
        flex: 1 1 auto;
        text-align: center;
        margin-right: 0;
        margin-bottom: 2px;
        border-radius: 4px;
        font-size: 0.9em;
        padding: 10px 5px;
    }

    .tab-panel {
        border-radius: 4px;
    }

    .tab-button {
        padding: 10px 2px;
        font-size: .8em;
    }
}