:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 16px;
}

/* Header & Nav */
.main-header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
}

.brand-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    text-decoration: none;
}

.brand-logo span {
    color: var(--text-color);
}

.breadcrumb-nav {
    padding: 12px 0;
    font-size: 0.875rem;
}

.breadcrumb {
    display: flex;
    list-style: none;
    gap: 8px;
    color: var(--text-muted);
}

.breadcrumb li::after {
    content: "/";
    margin-left: 8px;
}

.breadcrumb li:last-child::after {
    content: "";
}

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

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 32px 0 24px 0;
}

.hero-section h1 {
    font-size: 2rem;
    margin-bottom: 12px;
}

.hero-section p {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Category Grid */
.section-title {
    font-size: 1.25rem;
    margin: 24px 0 16px 0;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.tool-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s, border-color 0.2s;
    display: flex;
    flex-direction: column;
}

.tool-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.tool-card .icon {
    font-size: 2rem;
    margin-bottom: 8px;
}

.tool-card h3 {
    font-size: 1.1rem;
    margin-bottom: 6px;
    color: var(--text-color);
}

.tool-card p {
    font-size: 0.875rem;
    color: var(--text-muted);
    flex-grow: 1;
}

.tool-card .badge {
    align-self: flex-start;
    margin-top: 12px;
    font-size: 0.75rem;
    padding: 4px 8px;
    border-radius: 4px;
    font-weight: 600;
}

.badge-active {
    background: #dbeafe;
    color: var(--primary-color);
}

.badge-soon {
    background: #f1f5f9;
    color: var(--text-muted);
}

/* SEO Section */
.seo-article {
    background: var(--card-bg);
    padding: 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    margin-bottom: 40px;
}

.main-footer {
    text-align: center;
    padding: 24px 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.875rem;
}