:root {
    /* Light Theme Variables */
    --primary-color: #4169E1;
    --secondary-color: #6C63FF;
    --text-color: #333;
    --bg-color: #ffffff;
    --bg-alt: #f5f5f5;
    --light-gray: #f5f5f5;
    --border-color: #e0e0e0;
    --success-color: #4CAF50;
    --card-bg: #ffffff;
    --shadow-color: rgba(0,0,0,0.1);
    --shadow-sm: 0 2px 4px var(--shadow-color);
    --shadow-md: 0 4px 6px var(--shadow-color);
    --focus-ring: 0 0 0 3px rgba(65, 105, 225, 0.4);
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --radius-sm: 4px;
    --radius-md: 8px;
    --primary-color-rgb: 65, 105, 225;
    --secondary-color-rgb: 108, 99, 255;
}

@media (prefers-color-scheme: dark) {
    :root {
        --text-color: #e0e0e0;
        --bg-color: #1a1a1a;
        --bg-alt: #2a2a2a;
        --light-gray: #2a2a2a;
        --border-color: #404040;
        --card-bg: #2a2a2a;
        --shadow-color: rgba(0,0,0,0.3);
        --focus-ring: 0 0 0 3px rgba(108, 99, 255, 0.4);
    }
}

[data-theme="dark"] {
    --text-color: #e0e0e0;
    --bg-color: #1a1a1a;
    --bg-alt: #2a2a2a;
    --light-gray: #2a2a2a;
    --border-color: #404040;
    --card-bg: #2a2a2a;
    --shadow-color: rgba(0,0,0,0.3);
    --focus-ring: 0 0 0 3px rgba(108, 99, 255, 0.4);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: 1rem;
    font-weight: 600;
    line-height: 1.3;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }

/* Header & Navigation */
header {
    background: var(--primary-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.2s;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    position: relative;
}

.nav-links a:hover,
.nav-links a:focus-visible {
    opacity: 0.8;
    background: rgba(255, 255, 255, 0.1);
}

.nav-links a.active {
    border-bottom: 2px solid white;
}

.nav-links a.active:hover,
.nav-links a.active:focus-visible {
    opacity: 1;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 4rem 1rem;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Provider Grid */
.provider-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.provider-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: all 0.2s;
    border: 1px solid var(--border-color);
}

.provider-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
}

.provider-card:focus-within {
    border-color: var(--primary-color);
    box-shadow: var(--focus-ring);
}

.provider-features {
    margin: 1.5rem 0;
}

.provider-features p {
    margin: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.provider-features i {
    color: var(--success-color);
}

/* Comparison Table */
.comparison-table {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--card-bg);
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 0;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: var(--bg-alt);
    color: var(--text-color);
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 1;
}

tr:hover td {
    background: rgba(var(--primary-color-rgb), 0.05);
}

th:first-child,
td:first-child {
    padding-left: 1.5rem;
}

th:last-child,
td:last-child {
    padding-right: 1.5rem;
}

/* Use Cases */
.use-cases {
    background: var(--bg-alt);
    padding: 4rem 2rem;
}

.use-case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 2rem auto 0;
}

.use-case-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.use-case-card i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Footer */
footer {
    background: var(--text-color);
    color: white;
    padding: 4rem 2rem 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-section h4 {
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.footer-section a:hover {
    opacity: 1;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    font-size: 1.5rem;
}

.footer-bottom {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
    border: 2px solid transparent;
    cursor: pointer;
}

.btn:hover {
    background: var(--secondary-color);
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn:focus-visible {
    border-color: white;
}

/* Mobile Menu */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: 2px solid transparent;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
}

.mobile-menu-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.mobile-menu-toggle:focus-visible {
    border-color: white;
}

/* Responsive Design */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--primary-color);
        flex-direction: column;
        padding: 1rem;
        gap: 1rem;
    }

    .nav-links.active {
        display: flex;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .provider-grid {
        grid-template-columns: 1fr;
    }

    .comparison-table {
        padding: 1rem;
    }

    .use-case-grid {
        grid-template-columns: 1fr;
    }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.provider-card, .use-case-card {
    animation: fadeIn 0.5s ease-out forwards;
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

/* Print Styles */
@media print {
    header, footer, .btn {
        display: none;
    }

    body {
        color: black;
    }

    .provider-card, .use-case-card {
        break-inside: avoid;
        page-break-inside: avoid;
    }
}

/* Focus Styles */
:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
    border-radius: var(--radius-sm);
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    z-index: 1000;
    transition: top 0.2s;
}

.skip-link:focus {
    top: 0;
}

/* Loading States */
.loading {
    opacity: 0.7;
    pointer-events: none;
    position: relative;
}

.loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 24px;
    height: 24px;
    margin: -12px 0 0 -12px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    color: white;
    padding: 0.5rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 1rem;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.theme-toggle i {
    font-size: 1.2rem;
}

/* Color Utils */
.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--secondary-color); }
.text-success { color: var(--success-color); }
.bg-primary { background-color: var(--primary-color); }
.bg-secondary { background-color: var(--secondary-color); }
.bg-alt { background-color: var(--bg-alt); }

/* Transitions */
.theme-transition {
    transition: background-color 0.3s ease,
                color 0.3s ease,
                border-color 0.3s ease,
                box-shadow 0.3s ease;
}

/* Layout Utils */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }
.gap-4 { gap: 1.5rem; }

/* Spacing Utils */
.m-0 { margin: 0; }
.m-1 { margin: 0.25rem; }
.m-2 { margin: 0.5rem; }
.m-3 { margin: 1rem; }
.m-4 { margin: 1.5rem; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }

.p-0 { padding: 0; }
.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 1rem; }
.p-4 { padding: 1.5rem; }

/* Typography Utils */
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }

.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* Border Utils */
.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }

.border { border: 1px solid var(--border-color); }
.border-t { border-top: 1px solid var(--border-color); }
.border-b { border-bottom: 1px solid var(--border-color); }

/* Display Utils */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.inline { display: inline; }

/* Grid Utils */
.grid {
    display: grid;
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (min-width: 640px) {
    .sm\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 768px) {
    .md\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
}

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

/* Shadow Utils */
.shadow-none { box-shadow: none; }
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }

/* Visibility Utils */
.visible { visibility: visible; }
.invisible { visibility: hidden; }

/* Position Utils */
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }

.top-0 { top: 0; }
.right-0 { right: 0; }
.bottom-0 { bottom: 0; }
.left-0 { left: 0; }

/* Z-index Utils */
.z-0 { z-index: 0; }
.z-10 { z-index: 10; }
.z-20 { z-index: 20; }
.z-30 { z-index: 30; }
.z-40 { z-index: 40; }
.z-50 { z-index: 50; }

/* Opacity Utils */
.opacity-0 { opacity: 0; }
.opacity-25 { opacity: 0.25; }
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }
.opacity-100 { opacity: 1; }

/* Cursor Utils */
.cursor-pointer { cursor: pointer; }
.cursor-default { cursor: default; }
.cursor-not-allowed { cursor: not-allowed; }

/* Overflow Utils */
.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }
.overflow-scroll { overflow: scroll; }

/* Width/Height Utils */
.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }

/* Object Fit Utils */
.object-cover { object-fit: cover; }
.object-contain { object-fit: contain; }
.object-fill { object-fit: fill; }

/* List Utils */
.list-none { list-style: none; }
.list-disc { list-style: disc; }
.list-decimal { list-style: decimal; }