:root {
    --color-primary: #212529;
    --color-accent: #0D6EFD;
    --color-accent-hover: #0b5ed7;
    --color-bg: #ffffff;
    --color-bg-alt: #f8f9fa;
    --color-text: #212529;
    --color-text-muted: #6c757d;
    --color-border: #dee2e6;
    --color-success: #198754;
    --color-warning: #ffc107;

    --container-width: 1200px;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;

    --font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* 1. Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
    font-size: 16px;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

a:hover {
    text-decoration: underline;
}

ul {
    list-style: none;
}

/* 2. Layout & Guardrails */
.container {
    width: 100%;
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-sm);
    margin-left: auto;
    margin-right: auto;
}

@media (min-width: 768px) {
    .container {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }
}

@media (min-width: 1200px) {
    .container {
        max-width: var(--container-width);
    }
}

section {
    padding: var(--spacing-lg) 0;
}

.section-bg-alt {
    background-color: var(--color-bg-alt);
}

/* 3. Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--color-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
p { margin-bottom: 1rem; color: var(--color-text-muted); }

.text-center { text-align: center; }
.text-lead { font-size: 1.25rem; font-weight: 300; }
.text-small { font-size: 0.875rem; }
.fw-bold { font-weight: 700; }

@media (min-width: 768px) {
    h1 { font-size: 3.5rem; }
    h2 { font-size: 2.5rem; }
}

/* 4. Components */
/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: 0.375rem;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: #000;
    border-color: #000;
    text-decoration: none;
}

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

.btn-accent:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    text-decoration: none;
}

.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: white;
    text-decoration: none;
}

.btn-block {
    display: block;
    width: 100%;
}

/* Navigation */
.navbar {
    padding: 1rem 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.brand:hover { text-decoration: none; }

.nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    width: 40px;
    height: 40px;
}

.nav-toggle-icon {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-primary);
    position: relative;
    transition: background-color 0.2s;
    border-radius: 2px;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-primary);
    transition: transform 0.2s;
    border-radius: 2px;
}

.nav-toggle-icon::before { top: -8px; }
.nav-toggle-icon::after { top: 8px; }

.nav-links {
    display: none;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
}

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

@media (min-width: 768px) {
    .nav-toggle {
        display: none;
    }

    .nav-links {
        display: flex;
        flex-direction: row;
        gap: 1.5rem;
        align-items: center;
        width: auto;
        margin-top: 0;
        padding-top: 0;
        border-top: none;
    }
}

/* Page Content Wrapper for consistent padding */
.page-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem; /* Mobile padding */
}

@media (min-width: 768px) {
    .page-content {
        padding: 4rem 0; /* Desktop padding */
    }
}

.nav-link {
    color: var(--color-text-muted);
    font-weight: 500;
}

.nav-link:hover {
    color: var(--color-primary);
    text-decoration: none;
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }

@media (min-width: 768px) {
    .grid-2 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

/* Cards */
.card {
    background: var(--color-bg);
    padding: var(--spacing-md);
    border-radius: 0.5rem;
    border: 1px solid var(--color-border);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.shadow { box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.05); }

/* Toggle Switch */
.toggle-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--color-accent);
}

input:focus + .slider {
    box-shadow: 0 0 1px var(--color-accent);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.toggle-label {
    font-weight: 600;
    color: var(--color-text-muted);
    cursor: pointer;
}

.toggle-label.active {
    color: var(--color-primary);
}

/* Pricing Cards */
.pricing-card {
    text-align: center;
    position: relative;
    transition: transform 0.2s;
}

.pricing-card:hover {
    transform: translateY(-5px);
}

.pricing-price {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 1rem 0;
    color: var(--color-primary);
}

.pricing-badge {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-accent);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 700;
}

.price-yearly { display: none; }
.price-monthly { display: block; }

body.show-yearly .price-yearly { display: block; }
body.show-yearly .price-monthly { display: none; }

/* 5. Specific Sections */
/* Hero */
.hero {
    text-align: center;
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
}

.hero-subhead {
    max-width: 800px;
    margin: 0 auto 2rem;
    font-size: 1.25rem;
    color: var(--color-text-muted);
}

/* Data Promise */
.data-promise {
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-md) 0;
}

.promise-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
    text-align: center;
}

.promise-item {
    flex: 1 1 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 500;
}

/* Footer */
footer {
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    margin-top: auto;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-bottom: 1rem;
}

@media (min-width: 768px) {
    .footer-content {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    .footer-links {
        margin-bottom: 0;
    }
}