/* Base Reset and Variables */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors - Neutral Palette */
    --color-bg-light: rgb(250, 250, 250); /* neutral-50 */
    --color-bg-dark: rgb(23, 23, 23); /* neutral-900 */
    --color-text-light: rgb(0, 0, 0);
    --color-text-dark: rgb(229, 229, 229); /* neutral-200 */
    --color-border-light: rgb(229, 229, 229); /* neutral-200 */
    --color-border-dark: rgb(38, 38, 38); /* neutral-800 */
    --color-text-muted-light: rgb(115, 115, 115); /* neutral-500 */
    --color-text-muted-dark: rgb(163, 163, 163); /* neutral-400 */
    --color-hover-light: rgb(245, 245, 245); /* neutral-100 */
    --color-hover-dark: rgb(38, 38, 38); /* neutral-800 */
    --color-button-bg-light: rgb(23, 23, 23); /* neutral-900 */
    --color-button-bg-dark: rgb(245, 245, 245); /* neutral-100 */
    --color-button-text-light: rgb(255, 255, 255);
    --color-button-text-dark: rgb(23, 23, 23); /* neutral-900 */
    
    /* Spacing */
    --sidebar-width: 16rem; /* 256px */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    
    /* Typography */
    --font-sans: "Roboto", sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

/* Base HTML and Body */
html {
    scroll-behavior: smooth;
    font-size: 125%; /* 25% larger as per Astro site */
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg-light);
    color: var(--color-text-light);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Mobile Toggle Button */
.mobile-toggle {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 20;
    padding: 0.5rem;
    color: var(--color-text-light);
    background-color: rgba(250, 250, 250, 0.8);
    backdrop-filter: blur(8px);
    border: 1px solid var(--color-border-light);
    border-radius: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

html.dark .mobile-toggle {
    color: var(--color-text-dark);
    background-color: rgba(23, 23, 23, 0.8);
    border-color: var(--color-border-dark);
}

.mobile-toggle:hover {
    background-color: var(--color-hover-light);
}

html.dark .mobile-toggle:hover {
    background-color: var(--color-hover-dark);
}

.mobile-toggle .menu-icon {
    width: 1.5rem;
    height: 1.5rem;
    display: block;
}

@media (min-width: 640px) {
    .mobile-toggle {
        display: none;
    }
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 10;
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--color-bg-light);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
}

html.dark .sidebar {
    background-color: var(--color-bg-dark);
}

.sidebar.sidebar-open {
    transform: translateX(0);
}

@media (min-width: 640px) {
    .sidebar {
        transform: translateX(0);
    }
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: var(--spacing-6);
}

.sidebar-title {
    margin-top: 4rem;
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: var(--spacing-6);
}

@media (min-width: 640px) {
    .sidebar-title {
        margin-top: 0;
    }
}

.sidebar-title a {
    color: inherit;
    text-decoration: none;
}

/* Navigation */
.sidebar-nav {
    flex: 1;
}

.nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    margin-bottom: var(--spacing-2);
}

.nav-link,
.nav-link-text {
    display: block;
    color: var(--color-text-muted-light);
    text-decoration: none;
    transition: color 0.2s;
}

html.dark .nav-link,
html.dark .nav-link-text {
    color: var(--color-text-muted-dark);
}

.nav-link:hover {
    color: var(--color-text-light);
}

html.dark .nav-link:hover {
    color: var(--color-text-dark);
}

.nav-link.active {
    color: var(--color-text-light);
}

html.dark .nav-link.active {
    color: var(--color-text-dark);
}

.nav-link-text {
    font-weight: 500;
    margin-bottom: var(--spacing-2);
}

.nav-sub-list {
    list-style: none;
    margin: 0;
    padding: 0;
    margin-left: var(--spacing-4);
}

.nav-sub-item {
    margin-bottom: var(--spacing-2);
}

.nav-sub-link {
    display: block;
    color: var(--color-text-muted-light);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.2s;
}

html.dark .nav-sub-link {
    color: var(--color-text-muted-dark);
}

.nav-sub-link:hover {
    color: var(--color-text-light);
}

html.dark .nav-sub-link:hover {
    color: var(--color-text-dark);
}

.nav-sub-link.active {
    color: var(--color-text-light);
}

html.dark .nav-sub-link.active {
    color: var(--color-text-dark);
}

/* CTA Button */
.sidebar-cta {
    margin-top: var(--spacing-8);
}

.cta-button {
    display: block;
    width: 100%;
    padding: 0.625rem var(--spacing-4);
    text-align: center;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-button-text-light);
    background-color: var(--color-button-bg-light);
    border-radius: 0.5rem;
    text-decoration: none;
    transition: all 0.2s;
}

html.dark .cta-button {
    color: var(--color-button-text-dark);
    background-color: var(--color-button-bg-dark);
}

.cta-button:hover {
    background-color: rgb(38, 38, 38); /* neutral-800 */
}

html.dark .cta-button:hover {
    background-color: rgb(229, 229, 229); /* neutral-200 */
}

/* Sidebar Footer Menu */
.sidebar-footer-menu {
    margin-top: auto;
    padding-top: var(--spacing-4);
}

.sidebar-footer-menu ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.sidebar-footer-menu li {
    margin-bottom: var(--spacing-2);
}

.footer-link {
    color: var(--color-text-muted-light);
    text-decoration: none;
    font-size: 0.875rem;
}

html.dark .footer-link {
    color: var(--color-text-muted-dark);
}

/* Content Wrapper */
.content-wrapper {
    display: flex;
    flex-direction: column;
    margin-left: 0;
    flex: 1;
    min-height: 100vh;
}

@media (min-width: 640px) {
    .content-wrapper {
        margin-left: var(--sidebar-width);
    }
}

/* Main Content */
.main-content {
    padding: var(--spacing-4) var(--spacing-4);
    flex: 1;
    background-color: var(--color-bg-light);
}

html.dark .main-content {
    background-color: var(--color-bg-dark);
}

@media (min-width: 640px) {
    .main-content {
        padding: var(--spacing-4) var(--spacing-6);
    }
}

@media (min-width: 768px) {
    .main-content {
        padding: var(--spacing-4) var(--spacing-8);
    }
}

@media (min-width: 1024px) {
    .main-content {
        padding: var(--spacing-4) var(--spacing-10);
    }
}

/* Footer */
.footer {
    border: 1px solid var(--color-border-light);
}

html.dark .footer {
    border-color: var(--color-border-dark);
}

.footer-container {
    background-color: var(--color-bg-light);
    padding: var(--spacing-4);
}

html.dark .footer-container {
    background-color: var(--color-bg-dark);
}

@media (min-width: 640px) {
    .footer-container {
        padding: var(--spacing-6);
    }
}

@media (min-width: 768px) {
    .footer-container {
        padding: var(--spacing-8);
    }
}

@media (min-width: 1024px) {
    .footer-container {
        padding: var(--spacing-12);
    }
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-8);
}

.footer-column {
    min-width: 0;
}

@media (min-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.footer-heading {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-4);
    overflow-wrap: break-word;
}

html.dark .footer-heading {
    color: var(--color-text-dark);
}

.footer-links {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-links li {
    margin-bottom: var(--spacing-2);
}

.footer-links a {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    color: rgb(82, 82, 82); /* neutral-600 */
    text-decoration: none;
    transition: color 0.2s;
}

html.dark .footer-links a {
    color: var(--color-text-muted-dark);
}

.footer-links a:hover {
    color: var(--color-text-light);
}

html.dark .footer-links a:hover {
    color: var(--color-text-dark);
}

.footer-bottom {
    padding-top: var(--spacing-8);
    border-top: 1px solid var(--color-border-light);
}

html.dark .footer-bottom {
    border-top-color: var(--color-border-dark);
}

.footer-copyright {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted-light);
    text-align: center;
}

html.dark .footer-copyright {
    color: var(--color-text-muted-dark);
}

.footer-copyright a {
    color: inherit;
}

.footer-copyright a:hover {
    color: var(--color-text-light);
}

html.dark .footer-copyright a:hover {
    color: var(--color-text-dark);
}