:root {
    /* Colors */
    --color-primary: #4f46e5;
    --color-primary-dark: #4338ca;
    --color-secondary: #2563eb;
    --color-secondary-dark: #1d4ed8;
    --color-success: #16a34a;
    --color-success-dark: #15803d;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-900: #111827;

    /* Brand Colors - Primary */
    --brand-primary: #4338ca;
    --brand-primary-hover: #4f46e5;
    --brand-primary-light: rgba(67, 56, 202, 0.1);
    --brand-primary-light-hover: rgba(67, 56, 202, 0.2);

    /* Brand Color Palette */
    --palatinate-blue: #4338ca;
    --palatinate-blue-hsl: 245, 58%, 51%;
    
    --night: #0c120c;
    --night-hsl: 120, 20%, 6%;
    
    --engineering-orange: #c20114;
    --engineering-orange-hsl: 354, 99%, 38%;
    
    --ash-gray: #c7d6d5;
    --ash-gray-hsl: 176, 15%, 81%;
    
    --ghost-white: #ecebf3;
    --ghost-white-hsl: 248, 25%, 94%;

    /* Semantic Colors */
    --text-primary: var(--night);
    --text-secondary: rgba(12, 18, 12, 0.7);
    --background-primary: var(--ghost-white);
    --background-secondary: var(--ash-gray);
    --accent: var(--engineering-orange);
    
    /* Common Color Variations */
    --palatinate-blue-rgb: 67, 56, 202;
    --night-rgb: 12, 18, 12;
    --engineering-orange-rgb: 194, 1, 20;
    --ash-gray-rgb: 199, 214, 213;
    --ghost-white-rgb: 236, 235, 243;

    /* Legacy Colors (for compatibility) */
    --color-primary: var(--brand-primary);
    --color-primary-dark: var(--brand-primary-hover);
    --color-secondary: #2563eb;
    --color-secondary-dark: #1d4ed8;
    --color-success: #16a34a;
    --color-success-dark: #15803d;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-900: #111827;

    /* Spacing */
    --container-max-width: 1280px;
    --container-padding: 2rem;
}

/* Button System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 0.375rem;
    border: 1px solid transparent;
    transition: all 150ms;
}

.btn:focus {
    outline: none;
    ring: 2px;
    ring-offset: 2px;
}

.btn-primary {
    background-color: var(--brand-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--brand-primary-hover);
}

.btn-primary:focus {
    ring-color: var(--brand-primary-hover);
}

.btn-secondary {
    background-color: var(--color-secondary);
    color: white;
}

.btn-secondary:hover {
    background-color: var(--color-secondary-dark);
}

.btn-secondary:focus {
    ring-color: var(--color-secondary);
}

.btn-tertiary {
    background-color: white;
    color: var(--color-gray-700);
    border-color: var(--color-gray-300);
}

.btn-tertiary:hover {
    background-color: var(--color-gray-50);
}

.btn-tertiary:focus {
    ring-color: var(--color-gray-500);
}

.btn-success {
    background-color: var(--color-success);
    color: white;
}

.btn-success:hover {
    background-color: var(--color-success-dark);
}

.btn-success:focus {
    ring-color: var(--color-success);
}

.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* Navigation */
.nav-link {
    position: relative;
    color: var(--color-gray-500);
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--color-gray-900);
}

.nav-link:hover::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-gray-200);
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-primary);
}

/* Layout */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.admin-container {
    max-width: var(--container-max-width);
    margin: 2rem auto;
    padding: 0 var(--container-padding);
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--color-gray-700);
}

.form-control {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--color-gray-300);
    border-radius: 0.375rem;
    background-color: white;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    ring: 2px;
    ring-color: var(--color-primary);
}

/* Prose Styles */
.prose {
    color: var(--text-primary);
}

.prose > :first-child {
    margin-top: 0;
}

.prose > :last-child {
    margin-bottom: 0;
}

.prose h1,
.prose h2,
.prose h3,
.prose h4,
.prose h5,
.prose h6 {
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.25;
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}

.prose p {
    margin-top: 1em;
    margin-bottom: 1em;
    line-height: 1.625;
}

.prose ul {
    list-style-type: disc;
    padding-left: 1.5em;
    margin-top: 1em;
    margin-bottom: 1em;
}

.prose li {
    margin-top: 0.5em;
    margin-bottom: 0.5em;
}

.prose strong {
    font-weight: 600;
    color: var(--text-primary);
}

.prose a {
    color: var(--brand-primary);
    text-decoration: underline;
}

.prose pre {
    background-color: var(--color-gray-100);
    padding: 1em;
    border-radius: 0.375em;
    overflow-x: auto;
}

.prose code {
    color: var(--text-primary);
    background-color: var(--color-gray-100);
    padding: 0.25em 0.5em;
    border-radius: 0.25em;
    font-size: 0.875em;
}

/* Dropdown Menu */
.dropdown-menu {
    position: absolute;
    right: 0;
    z-index: 10;
    margin-top: 0.5rem;
    min-width: 12rem;
    overflow: hidden;
    padding: 0.5rem 0;
    background-color: white;
    border: 1px solid var(--color-gray-200);
    border-radius: 0.375rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.dropdown-menu button {
    display: block;
    width: 100%;
    text-align: left;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    color: var(--color-gray-700);
    transition: background-color 150ms;
}

.dropdown-menu button:hover {
    background-color: var(--color-gray-100);
}

/* Navigation */
.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-right span {
    color: var(--text-secondary);
}

.nav-right a {
    text-decoration: none;
    color: var(--text-primary);
}

.nav-right a:hover {
    color: var(--brand-primary);
}

.brand {
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    color: var(--brand-primary);
}

/* Hero section */
.hero {
    text-align: center;
    padding: 4rem 0;
    max-width: 65ch;
    margin: 0 auto;
}

.hero h1 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Features section */
.features {
    padding: 4rem 0;
    background-color: var(--background-primary);
}

.features-header {
    text-align: center;
    max-width: 65ch;
    margin: 0 auto 3rem auto;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 0 auto;
    max-width: var(--container-max-width);
}

.feature {
    padding: 1.5rem;
    border: 1px solid var(--color-gray-200);
    border-radius: 4px;
    background-color: white;
}

/* Footer */
.footer-content {
    text-align: center;
    padding: 2rem 0;
    background-color: var(--background-secondary);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.social-links a {
    color: var(--text-primary);
    text-decoration: none;
}

.social-links a:hover {
    color: var(--brand-primary);
}

/* Google Sign In */
.g_id_signin {
    margin-left: 1rem;
}