/* ================================================================
   Jason Hong — Personal Site
   Layout inspired by CAT-SOOP's base.css
   ================================================================ */

/* --- CSS Variables --- */
:root {
    --cs-base-bg-color: #1a56db;      /* deep blue */
    --cs-base-font-color: #ffffff;
    --cs-light-bg-color: #3b82f6;     /* lighter blue for hovers */
    --cs-light-font-color: #ffffff;
    --cs-max-page-width: 900px;
    --content-padding: 2rem;
}

/* --- Reset & Base --- */
html {
    height: 100%;
    font-size: 16px;
}
body {
    min-height: 100%;
    margin: 0;
    display: flex;
    flex-direction: column;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 Ubuntu, "Helvetica Neue", Helvetica, Arial, sans-serif;
    line-height: 1.7;
    color: #1a1a2e;
    background: #fafafa;
}
code, kbd, pre, samp, tt {
    font-family: "Cascadia Code", "JetBrains Mono", "Fira Code", Menlo,
                 Consolas, Courier, monospace;
    font-size: 0.9em;
}

/* --- Links --- */
a {
    color: var(--cs-base-bg-color);
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}

/* --- Tooltips --- */
.tooltip {
    position: relative;
    cursor: help;
    border-bottom: 1px dotted var(--cs-base-bg-color);
}
.tooltip::after {
    content: attr(data-tip);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 12px;
    background: #333;
    color: #fff;
    border-radius: 4px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s;
    z-index: 100;
}
.tooltip:hover::after {
    opacity: 1;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.3;
    color: #111;
}
h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; margin-top: 2rem; }
h3 { font-size: 1.25rem; margin-top: 1.5rem; }
h4 { font-size: 1.1rem; }

blockquote {
    margin: 1rem 0;
    padding: 0.5rem 1rem;
    border-left: 3px solid #ccc;
    color: #666;
}
code {
    padding: 2px 6px;
    border-radius: 4px;
    background: #f0f0f0;
    color: #333;
}
pre {
    padding: 1rem;
    border-radius: 6px;
    background: #f0f0f0;
    overflow-x: auto;
    line-height: 1.5;
}
pre code {
    padding: 0;
    background: transparent;
}

/* Tables */
table {
    border-collapse: collapse;
    width: 100%;
    margin: 1rem 0;
}
table, th, td {
    border: 1px solid #ddd;
    padding: 0.5rem;
}
th {
    background: #f5f5f5;
}

/* --- Header --- */
header {
    width: 100%;
    height: 3.5rem;
    background: var(--cs-base-bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
header a, header a:visited {
    color: var(--cs-base-font-color);
    text-decoration: none;
}
header a:hover {
    opacity: 0.85;
}
.nav-container {
    width: 100%;
    max-width: var(--cs-max-page-width);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--content-padding);
    height: 100%;
}
.cs_header_text {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}
.cs_nav_links {
    display: flex;
    gap: 1.5rem;
}
.cs_nav_links a {
    font-size: 0.95rem;
    font-weight: 500;
    padding: 0.25rem 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s;
}
.cs_nav_links a:hover {
    border-bottom-color: var(--cs-base-font-color);
    opacity: 1;
}

/* --- Breadcrumbs --- */
.cs_navigation {
    text-align: center;
    padding: 0.75rem 2rem;
}
.cs_top_navigation {
    border-bottom: 1px solid #e0e0e0;
    margin-top: 3.5rem;
    background: #fff;
}
.cs_navigation a {
    color: #666;
    font-size: 0.85rem;
}
.cs_navigation a:hover {
    color: var(--cs-base-bg-color);
}
.cs_nav_separator {
    color: #ccc;
    margin: 0 0.5rem;
}

/* --- Main Content --- */
main.cs_body {
    flex: 1;
    display: flex;
    justify-content: center;
    padding: 2rem var(--content-padding);
}
.cs_content {
    width: 100%;
    max-width: var(--cs-max-page-width);
}
.cs_page_body {
    margin-bottom: 3rem;
}
.cs_content_header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--cs-base-bg-color);
    color: var(--cs-base-bg-color);
}
.cs_content_inner {
    line-height: 1.8;
}
.cs_content_inner img {
    max-width: 100%;
    border-radius: 6px;
}
.cs_content_inner p {
    margin: 1rem 0;
}

/* --- Project Cards --- */
.project-card {
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 1.25rem;
    margin-bottom: 1rem;
    background: #fff;
    transition: box-shadow 0.2s;
}
.project-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.project-card h3 {
    margin: 0 0 0.5rem 0;
}
.project-card p {
    margin: 0 0 0.75rem 0;
    color: #555;
}
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.tag {
    display: inline-block;
    padding: 2px 10px;
    background: #e8f0fe;
    color: var(--cs-base-bg-color);
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* --- Blog Entries --- */
.blog-entry {
    padding: 1rem 0;
    border-bottom: 1px solid #eee;
}
.blog-entry:last-child {
    border-bottom: none;
}
.blog-date {
    color: #999;
    font-size: 0.85rem;
    margin-right: 0.75rem;
}
.blog-entry a {
    font-size: 1.1rem;
    font-weight: 600;
}
.blog-entry p {
    margin: 0.25rem 0 0 0;
    color: #666;
    font-size: 0.9rem;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 10px 20px;
    background: var(--cs-base-bg-color);
    color: #fff !important;
    border-radius: 6px;
    font-weight: 500;
    text-decoration: none;
    transition: background 0.2s;
}
.btn:hover {
    background: var(--cs-light-bg-color);
    text-decoration: none;
}

/* --- Math --- */
math {
    display: inline-block;
}
displaymath {
    display: block;
    margin: 1rem 0;
    overflow-x: auto;
}

/* --- Diagrams --- */
diagram {
    display: block;
    margin: 1.5rem 0;
    text-align: center;
    overflow-x: auto;
}

/* --- Code Highlighting (IDLE-style) --- */
.hljs { display: block; overflow-x: auto; padding: 0.5em; color: black; }
.hljs-comment, .hljs-quote { color: #dd0000; }
.hljs-keyword, .hljs-selector-tag, .hljs-literal { color: #ff7700; }
.hljs-name { color: #008; }
.hljs-variable, .hljs-template-variable { color: #660; }
.hljs-string { color: #00aa00; }
.hljs-regexp, .hljs-link { color: #080; }
.hljs-title, .hljs-tag, .hljs-symbol, .hljs-bullet, .hljs-meta { color: #1c00cf; }
.hljs-section, .hljs-type, .hljs-attr, .hljs-number, .hljs-params { color: inherit; }
.hljs-built_in, .hljs-builtin-name { color: #900090; }
.hljs-class .hljs-title { color: #0000ff; }
.hljs-attribute, .hljs-subst { color: #000; }
.hljs-formula { background-color: #eee; font-style: italic; }
.hljs-addition { background-color: #baeeba; }
.hljs-deletion { background-color: #ffc8bd; }
.hljs-selector-id, .hljs-selector-class { color: #9b703f; }
.hljs-doctag, .hljs-strong { font-weight: bold; }
.hljs-emphasis { font-style: italic; }

td.hljs-ln-numbers {
    border-right: 2px solid #aaa;
    text-align: right;
    padding-left: 5px !important;
    padding-right: 5px !important;
    background-color: #e0e0e0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
td.hljs-ln-code {
    padding-left: 10px !important;
}

/* --- Footer --- */
.cs_footer {
    text-align: center;
    background: #eee;
    border-top: 1px solid #ddd;
    padding: 2rem;
    font-size: 0.85rem;
    color: #666;
}

/* --- Responsive --- */
@media screen and (max-width: 700px) {
    .cs_nav_links {
        gap: 1rem;
    }
    .cs_nav_links a {
        font-size: 0.85rem;
    }
    .cs_header_text {
        font-size: 1.2rem;
    }
    .cs_content {
        max-width: 100%;
    }
    .cs_page_body {
        padding: 0;
    }
    main.cs_body {
        padding: 1rem;
    }
}