/* Basic Reset & Box-Sizing */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Light Mode Colors */
    --text-color: #042069; /* Dark Blue */
    --background-color: #e3e7f0; /* Light Grayish Blue */
    --accent-color: #FFA500; /* Marigold */
    --light-accent-color: #FFC04D; /* Lighter Orange for hover/active states */
    --border-color: #b0c4de; /* Light Steel Blue for borders */
    --card-background: #ffffff; /* White for content cards */

    /* Dark Mode Colors */
    --dark-text-color: #e3e7f0; /* Light Grayish Blue */
    --dark-background-color: #1a1a2e; /* Deep Dark Blue */
    --dark-accent-color: #ffda00; /* Gold dark mode contrast */
    --dark-light-accent-color: #ffe54c;
    --dark-border-color: #3f3e5b;
    --dark-card-background: #2a2a4a;

    /* Font Families */
    --font-heading: 'Roboto', sans-serif;
    --font-body: 'Fjord One', serif;

    /* Base font size for responsiveness */
    --base-font-size: clamp(16px, 1.2vw + 1rem, 18px); /* Min 16px, Preferred relative to viewport, Max 18px */

    /* Bookmark shape variables */
    --bookmark-cutout-size: 8px; /* Slightly smaller cutout for smaller nav items */
}

/* Base Body Styles */
body {
    font-family: var(--font-body);
    color: var(--text-color);
    background-color: var(--background-color);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease; /* Smooth transition for dark mode */
    font-size: var(--base-font-size); /* Apply base font size */

    display: flex; /* For sticky footer */
    flex-direction: column; /* For sticky footer */
    min-height: 100vh; /* Ensure body takes at least full viewport height */
}

/* Dark Mode Styles */
body.dark-mode {
    color: var(--dark-text-color);
    background-color: var(--dark-background-color);
}

body.dark-mode .site-header {
    background-color: var(--dark-background-color);
    border-bottom-color: var(--dark-border-color);
}

body.dark-mode .header-top {
    background-color: var(--dark-background-color);
    border-bottom-color: var(--dark-border-color);
}

body.dark-mode .main-nav-wrapper {
    background-color: var(--dark-background-color);
    border-bottom-color: var(--dark-border-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
}

body.dark-mode .site-branding h1,
body.dark-mode .site-branding .tagline {
    color: var(--dark-text-color);
}

body.dark-mode .main-nav ul li a {
    color: var(--dark-text-color); /* Text color for nav items in dark mode */
}

body.dark-mode .main-nav ul li a:hover::before,
body.dark-mode .main-nav ul li a.active::before {
    background-color: var(--dark-accent-color); /* Bookmark background color in dark mode */
}

body.dark-mode .main-nav ul li a:hover,
body.dark-mode .main-nav ul li a.active {
    color: var(--dark-background-color); /* Text matches dark mode background when highlighted */
}


body.dark-mode .site-footer {
    background-color: var(--dark-background-color);
    color: var(--dark-text-color);
    border-top-color: var(--dark-border-color);
}

body.dark-mode .content-section {
    background-color: var(--dark-card-background);
    border-color: var(--dark-border-color);
    color: var(--dark-text-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

body.dark-mode .content-section h2 {
    color: var(--dark-accent-color);
}

body.dark-mode h3 {
    color: var(--dark-accent-color);
    border-bottom-color: var(--dark-border-color);
}


/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text-color);
    margin-bottom: 0.8em;
    line-height: 1.2;
}

/* Fluid Font Sizes for Headings */
h1 {
    font-size: clamp(1.8em, 4.5vw, 3em);
    font-weight: 700;
    margin-bottom: 0em;
}

.tagline {
    font-family: var(--font-body);
    font-size: clamp(0.8em, 1.8vw, 1.0em);
    color: var(--text-color);
    margin-top: 0;
    margin-bottom: 0.5em;
}

h2 {
    font-size: clamp(1.8em, 4vw, 2.5em);
}

h3 {
    font-family: var(--font-heading); /* Use the heading font */
    font-size: clamp(1.2em, 2.5vw, 1.8em); /* Smaller than h2 but larger than body text */
    color: var(--accent-color); /* Give accent color for prominence */
    margin-top: 1.5em; /* Add space above */
    margin-bottom: 0.8em; /* Add space below */
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.2em; /* Padding for the border */
}

p {
    margin-bottom: 1em;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

/* Fluid Font Sizes for Headings */
h1 {
    font-size: clamp(1.8em, 4.5vw, 3em); /* Smaller max font size for h1 */
    font-weight: 700;
    margin-bottom: 0em; /* Reduced margin below h1 to eliminate extra space */
}

.tagline {
    font-family: var(--font-body);
    font-size: clamp(0.8em, 1.8vw, 1.0em); /* Smaller max font size for tagline */
    color: var(--text-color);
    margin-top: 0;
    margin-bottom: 0.5em; /* Reduced bottom margin for tagline */
}

h2 {
    font-size: clamp(1.8em, 4vw, 2.5em);
}

p {
    margin-bottom: 1em;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover, a:focus {
    color: var(--light-accent-color);
    text-decoration: underline;
}

/* Layout - Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Header General Styles */
.site-header {
    width: 100%;
    background-color: var(--background-color);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.header-top {
    padding: 5px 0; /* Reduced vertical padding */
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0px; /* Reduced gap */
}

.site-branding {
    text-align: center;
    flex-grow: 1;
    margin-bottom: 0px; /* Removed bottom margin */
    width: 100%;
}

/* Main Navigation Wrapper */
.main-nav-wrapper {
    background-color: var(--background-color);
    padding: 5px 0; /* Reduced vertical padding */
    border-bottom: 1px solid var(--border-color);
    z-index: 999;
    width: 100%;
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.main-nav-wrapper.is-fixed {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
    border-bottom: 1px solid var(--border-color);
}

/* Main Navigation */
.main-nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap; /* Wrapping if items still don't fit */
    justify-content: center;
    padding: 0;
    margin: 0;
    width: 100%;
}

.main-nav ul li {
    margin: 2px 4px; /* Reduced margin between list items */
}

.main-nav ul li a {
    font-family: var(--font-heading);
    font-size: clamp(0.8em, 1.5vw, 0.95em); /* Reduced font size for nav links */
    color: var(--text-color);
    padding: 4px 8px; /* Reduced padding inside the link */
    display: block;
    position: relative;
    z-index: 1;
    text-decoration: none;
    transition: color 0.2s ease;
    overflow: hidden;
    white-space: nowrap; /* Prevent text from wrapping within a link */
}

/* Bookmark Highlight using ::before pseudo-element and clip-path */
.main-nav ul li a::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--light-accent-color);
    z-index: -1;
    transition: background-color 0.2s ease, transform 0.3s ease, clip-path 0.3s ease;

    clip-path: polygon(
        0% 0%,
        100% 0%,
        100% calc(100% - var(--bookmark-cutout-size)),
        50% 100%,
        0% calc(100% - var(--bookmark-cutout-size))
    );

    transform: translateY(100%);
    opacity: 0;
}

/* Hover and Active states for the bookmark highlight */
.main-nav ul li a:hover::before,
.main-nav ul li a.active::before {
    transform: translateY(0);
    opacity: 1;
    background-color: var(--accent-color);
}

/* Highlighted text color */
.main-nav ul li a:hover,
.main-nav ul li a.active {
    color: var(--background-color); /* Text matches page background when highlighted */
    background-color: transparent;
    border-radius: 0;
}


/* Placeholder to prevent content overlap */
#header-placeholder {
    height: 0; /* This will be set by JS */
    transition: height 0.3s ease;
}

/* Main Content Area */
.site-content {
    flex-grow: 1;
    padding: 40px 0;
}

.content-section {
    background-color: var(--card-background);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 30px;
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
}

.content-section h2 {
    color: var(--accent-color);
}

/* Footer Styles */
.site-footer {
    background-color: var(--background-color);
    color: var(--text-color);
    text-align: center;
    padding: 20px 0;
    border-top: 1px solid var(--border-color);
    font-size: 0.9em;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.site-footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.footer-line {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    width: 100%;
    gap: 10px;
}

.footer-line p {
    margin: 0;
}

/* Dark Mode Toggle Button in Footer */
.dark-mode-toggle {
    background: none;
    border: none;
    font-size: 1.8em;
    cursor: pointer;
    padding: 5px;
    transition: transform 0.2s ease;
    color: inherit;
    outline: none;
}

.dark-mode-toggle:hover {
    transform: scale(1.1);
}

.dark-mode-toggle:focus-visible {
    outline: none;
}


/* Responsive Adjustments (Mobile-First) */

/* Desktop or tablet sizes */
@media (min-width: 768px) {
    .header-top {
        padding: 5px 0; /* Keep padding consistent for desktop */
        gap: 0px; /* Keep gap consistent for desktop */
    }

    .site-branding {
        margin-bottom: 0;
    }

    .site-branding h1 {
        font-size: clamp(2.0em, 2.5vw, 2.5em); /* Slightly smaller h1 for desktop */
    }

    .site-branding .tagline {
        font-size: clamp(0.9em, 1.2vw, 1.0em); /* Slightly smaller tagline for desktop */
    }

    .main-nav-wrapper {
        padding: 5px 0; /* Keep padding consistent for desktop */
    }
}