/* Layout Styles - Based on LinghaoZhuang.github.io */

/* Overall page layout */
html {
    background-color: #eeeeee;
}

body {
    font-family: Georgia, Helvetica, Arial, Verdana, san-serif, Times, SimSun, "宋体", serif;
    color: #000;
    background-color: #ffffff;
    text-align: left;
    margin-top: 30px;
    margin-bottom: 30px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 50px;
    padding-right: 50px;
    padding-top: 10px;
    padding-bottom: 30px;
    max-width: 960px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

#layout-content {
    padding-top: 0.0em;
    padding-left: 1.0em;
    padding-right: 1.0em;
    border: none;
    background: white;
    text-align: left;
    vertical-align: top;
}


/* Navigation menu */
.nav-menu {
    background-color: #f8f9fa;
    padding: 12px 20px;
    border-radius: 8px;
    margin: 20px 0;
    text-align: center;
    border: 1px solid #e0e0e0;
}

.nav-menu nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
}

.nav-menu a {
    color: #003366;
    text-decoration: none;
    font-weight: 500;
    padding: 5px 10px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-menu a:hover {
    background-color: #e3f2fd !important;
    border-bottom: none !important;
}

/* Typography */
h1, h2, h3 {
    color: #003366;
    margin-top: 0.7em;
    margin-bottom: 0.3em;
    padding-bottom: 0.2em;
    line-height: 1.0;
    padding-top: 0.5em;
    border-bottom: 1px solid #aaaaaa;
}

h1 {
    font-size: 165%;
}

h2 {
    padding-top: 0.8em;
    font-size: 125%;
}

h2 + h3 {
    padding-top: 0.2em;
}

h3 {
    font-size: 110%;
    border-bottom: none;
}

p {
    margin-top: 0.0em;
    margin-bottom: 0.8em;
    padding: 0;
    line-height: 1.3;
}

/* Links */
a, a > tt {
    color: #224b8d;
    text-decoration: none;
}

a:hover {
    color: #003366;
    border-bottom: 1px gray dotted;
}

/* Lists */
ul, ol, dl {
    margin-top: 0.2em;
    padding-top: 0;
    margin-bottom: 0.8em;
}

ul {
    list-style-position: outside;
    list-style-type: square;
}

ol {
    list-style-position: outside;
    list-style-type: decimal;
}

li p {
    margin-bottom: 0.3em;
}

/* Theme toggle button */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    border: 2px solid #003366;
    background-color: #ffffff;
    color: #003366;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.theme-toggle:hover {
    background-color: #f0f0f0;
    transform: scale(1.1);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.theme-icon {
    display: inline-block;
    line-height: 1;
}

/* Responsive adjustments */
@media screen and (max-width: 768px) {
    body {
        padding-left: 15px;
        padding-right: 15px;
        margin-top: 15px;
        margin-bottom: 15px;
    }
    
    h1 {
        font-size: 140%;
    }
    
    h2 {
        font-size: 115%;
    }
    
    h3 {
        font-size: 105%;
    }
    
    p {
        font-size: 0.95em;
    }
    
    #header_container {
        height: auto;
    }
    
    #headshot {
        float: none;
        margin: 0 auto;
    }
    
    #main_info_container {
        margin-left: 0;
        width: 100%;
        text-align: center;
    }
    
    .pages_post_descr {
        width: 100%;
    }
    
    .nav-menu {
        padding: 10px 15px;
    }
    
    .nav-menu nav {
        gap: 10px;
    }
}

@media screen and (max-width: 480px) {
    body {
        padding-left: 10px;
        padding-right: 10px;
        margin-top: 10px;
        margin-bottom: 10px;
    }
    
    h1 {
        font-size: 125%;
    }
    
    h2 {
        font-size: 110%;
    }
    
    h3 {
        font-size: 100%;
    }
    
    p {
        font-size: 0.9em;
        line-height: 1.4;
    }
    
    .nav-menu {
        padding: 8px 10px;
    }
    
    .nav-menu nav {
        flex-direction: column;
        gap: 8px;
    }
    
    .nav-menu a {
        display: block;
        text-align: center;
    }
    
    .theme-toggle {
        top: 10px;
        right: 10px;
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
}

/* Dark mode support - Manual toggle (via class) */
html.dark-mode {
    background-color: #22222d;
}

html.dark-mode body {
    color: #e8e8e8;
    background-color: #252530;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

html.dark-mode #layout-content {
    background: #252530;
}

html.dark-mode .nav-menu {
    background-color: #2d2d3f;
    border: 1px solid #3a3a4f;
}

html.dark-mode .nav-menu a {
    color: #7fb3d3;
}

html.dark-mode .nav-menu a:hover {
    background-color: #353548 !important;
    color: #9bc4e2;
}

html.dark-mode h1,
html.dark-mode h2,
html.dark-mode h3 {
    color: #d4dae8;
    border-bottom: 1px solid #3a3a4f;
}

html.dark-mode a,
html.dark-mode a > tt {
    color: #7fb3d3;
}

html.dark-mode a:hover {
    color: #9bc4e2;
    border-bottom: 1px solid #5a5a6f;
}

html.dark-mode footer {
    color: #b8b8c8;
}

html.dark-mode footer #footer-text {
    border-top: 1px solid #3a3a4f;
}

html.dark-mode .theme-toggle {
    background-color: #2d2d3f;
    border-color: #7fb3d3;
    color: #7fb3d3;
}

html.dark-mode .theme-toggle:hover {
    background-color: #353548;
}

/* Dark mode support - System preference (fallback) */
@media (prefers-color-scheme: dark) {
    html:not(.light-mode) {
        background-color: #22222d;
    }
    
    html:not(.light-mode) body {
        color: #e8e8e8;
        background-color: #252530;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    }
    
    html:not(.light-mode) #layout-content {
        background: #252530;
    }
    
    html:not(.light-mode) .nav-menu {
        background-color: #2d2d3f;
        border: 1px solid #3a3a4f;
    }
    
    html:not(.light-mode) .nav-menu a {
        color: #7fb3d3;
    }
    
    html:not(.light-mode) .nav-menu a:hover {
        background-color: #353548 !important;
        color: #9bc4e2;
    }
    
    html:not(.light-mode) h1,
    html:not(.light-mode) h2,
    html:not(.light-mode) h3 {
        color: #d4dae8;
        border-bottom: 1px solid #3a3a4f;
    }
    
    html:not(.light-mode) a,
    html:not(.light-mode) a > tt {
        color: #7fb3d3;
    }
    
    html:not(.light-mode) a:hover {
        color: #9bc4e2;
        border-bottom: 1px solid #5a5a6f;
    }
    
    html:not(.light-mode) footer {
        color: #b8b8c8;
    }
    
    html:not(.light-mode) footer #footer-text {
        border-top: 1px solid #3a3a4f;
    }
    
    html:not(.light-mode) .theme-toggle {
        background-color: #2d2d3f;
        border-color: #7fb3d3;
        color: #7fb3d3;
    }
    
    html:not(.light-mode) .theme-toggle:hover {
        background-color: #353548;
    }
}