:root {
    --color-primary: #222;
    --color-primary-hover: #767676;
    --color-secondary: #333;
    --white: #ffffff;
    --off-white: #fafafa;
    --text-primary: #333;
    --text-secondary: #666;
    --text-muted: #767676;
    --border-whisper: 1px solid #eee;
    --border-light: #ddd;
    --focus-ring: #222;
    --font-family: 'Libre Franklin', -apple-system, system-ui, 'Segoe UI', Helvetica, 'Apple Color Emoji', Arial, 'Segoe UI Emoji', 'Segoe UI Symbol', sans-serif;
    --space-xs: 0.125rem;
    --space-sm: 0.25rem;
    --space-md: 0.5rem;
    --space-lg: 0.75rem;
    --space-xl: 1rem;
    --space-2xl: 1.5rem;
    --space-3xl: 2rem;
    --space-4xl: 3rem;
    --space-5xl: 4rem;
    --radius-micro: 2px;
    --radius-standard: 3px;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    font-size: 100%;
}
body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--white);
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}
.nav {
    position: sticky;
    top: 0;
    background: var(--white);
    border-bottom: var(--border-whisper);
    z-index: 100;
}
.nav-inner {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}
.nav-logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}
.nav-logo:hover {
    opacity: 0.8;
}
.nav-logo img {
    height: 40px;
}
.nav-logo-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}
.nav-links {
    display: flex;
    gap: var(--space-2xl);
    align-items: center;
}
.nav-link {
    font-size: 0.94rem;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}
.nav-link:hover {
    color: var(--color-primary-hover);
}
.nav-hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}
.nav-hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    margin: 5px 0;
    transition: 0.3s;
}
@media (max-width: 768px) {
    .nav-inner {
        position: relative;
    }
    .nav-hamburger {
        display: block;
        z-index: 101;
    }
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: var(--space-xl);
        border-bottom: var(--border-whisper);
        gap: var(--space-md);
    }
    .nav-links.open {
        display: flex;
    }
}
.hero {
    padding: var(--space-5xl) var(--space-xl);
    text-align: center;
    background: var(--white);
}
.hero h1 {
    font-size: 1.875rem;
    font-weight: 300;
    line-height: 1.4;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
}
.hero p {
    font-size: 1.125rem;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}
@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.5625rem;
    }
    .hero p {
        font-size: 1rem;
    }
}
.tools-section {
    padding: var(--space-4xl) var(--space-xl);
    background: var(--off-white);
}
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-xl);
    max-width: 1000px;
    margin: 0 auto;
}
.tool-card {
    background: var(--white);
    border: var(--border-whisper);
    border-radius: var(--radius-standard);
    padding: var(--space-2xl);
    text-decoration: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.tool-card:hover {
    border-color: var(--border-light);
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.tool-card:focus {
    outline: 2px solid var(--focus-ring);
    outline-offset: 2px;
}
.tool-card-icon {
    width: 48px;
    height: 48px;
    background: var(--off-white);
    border-radius: var(--radius-standard);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-lg);
    font-size: 1.5rem;
}
.tool-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}
.tool-card p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.5;
}
.footer {
    padding: var(--space-3xl) var(--space-xl);
    border-top: var(--border-whisper);
    text-align: center;
}
.footer p {
    font-size: 0.875rem;
    color: var(--text-muted);
}
.footer a {
    color: var(--text-primary);
    text-decoration: none;
}
.footer a:hover {
    text-decoration: underline;
}