:root {
    --color-bg: #f8f9fa;
    --color-surface: #ffffff;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-danger: #dc2626;
    --color-success: #16a34a;
    --color-info: #0891b2;
    --color-text: #1f2937;
    --color-muted: #6b7280;
    --color-border: #e5e7eb;
    --radius: 8px;
    --radius-lg: 12px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Layout */
.container { max-width: 1024px; margin: 0 auto; padding: 2rem 1.5rem; }

/* Navigation */
.site-nav {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 0.75rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.site-nav-brand { font-weight: 700; font-size: 1.125rem; color: var(--color-text); text-decoration: none; }
.site-nav-links { display: flex; gap: 1.5rem; align-items: center; }
.site-nav-links a { color: var(--color-muted); font-size: 0.875rem; font-weight: 500; }
.site-nav-links a:hover, .site-nav-links a.active { color: var(--color-text); text-decoration: none; }

/* Headings */
h1 { font-size: 2rem; margin-bottom: 1rem; }
h2 { font-size: 1.5rem; margin-bottom: 1rem; margin-top: 2rem; }
h3 { font-size: 1.125rem; margin-bottom: 0.5rem; }

/* Alerts */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.875rem;
}
.alert-success { background: #dcfce7; color: var(--color-success); }
.alert-danger { background: #fee2e2; color: var(--color-danger); }
.alert-info { background: #e0f2fe; color: var(--color-info); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    transition: opacity 0.15s;
}
.btn:hover { opacity: 0.9; text-decoration: none; }
.btn-primary { background: var(--color-primary); color: white; }
.btn-danger { background: var(--color-danger); color: white; }
.btn-success { background: var(--color-success); color: white; }
.btn-outline { background: transparent; border: 1px solid var(--color-border); color: var(--color-text); }
.btn-sm { padding: 0.25rem 0.5rem; font-size: 0.75rem; }
.btn-lg { padding: 0.75rem 1.5rem; font-size: 1rem; }

/* Tables */
table { width: 100%; border-collapse: collapse; background: var(--color-surface); border-radius: var(--radius); overflow: hidden; }
th, td { padding: 0.75rem 1rem; text-align: left; border-bottom: 1px solid var(--color-border); }
th { background: var(--color-bg); font-weight: 600; font-size: 0.8125rem; color: var(--color-muted); text-transform: uppercase; letter-spacing: 0.05em; }

/* Badges */
.badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    cursor: default;
}
.badge-active { background: var(--color-primary); color: white; border-color: var(--color-primary); }
.badge-success { background: #dcfce7; color: var(--color-success); border-color: #86efac; }
.badge-danger { background: #fee2e2; color: var(--color-danger); border-color: #fca5a5; }

/* Forms */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.25rem; font-weight: 500; font-size: 0.875rem; }
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="search"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-family: inherit;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Toolbar */
.toolbar { display: flex; gap: 1rem; margin-bottom: 1.5rem; align-items: center; }

/* Stats */
.stats { display: flex; gap: 1.5rem; margin-bottom: 2rem; flex-wrap: wrap; }
.stat {
    background: var(--color-surface);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    text-align: center;
    flex: 1;
    min-width: 150px;
}
.stat strong { display: block; font-size: 2rem; line-height: 1; }
.stat span { color: var(--color-muted); font-size: 0.875rem; }
.stat small { display: block; margin-top: 0.25rem; font-size: 0.75rem; color: var(--color-muted); }

/* Hero (landing page) */
.hero {
    text-align: center;
    padding: 4rem 0 3rem;
}
.hero h1 { font-size: 3rem; margin-bottom: 0.5rem; }
.hero-subtitle { font-size: 1.25rem; color: var(--color-muted); margin-bottom: 2rem; max-width: 600px; margin-left: auto; margin-right: auto; }

/* How it works */
.how-it-works { padding: 2rem 0; }
.how-it-works h2 { text-align: center; }
.steps { display: flex; gap: 2rem; margin-top: 1.5rem; }
.step {
    flex: 1;
    text-align: center;
    padding: 1.5rem;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}
.step strong { display: block; margin-bottom: 0.5rem; }

/* Stats section (landing) */
.stats-section { display: flex; gap: 2rem; justify-content: center; padding: 2rem 0; }

/* Skill cards */
.skill-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1rem; margin-top: 1rem; }
.skill-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    transition: border-color 0.15s, box-shadow 0.15s;
    text-decoration: none;
    color: inherit;
    display: block;
}
.skill-card:hover { border-color: var(--color-primary); box-shadow: 0 2px 8px rgba(0,0,0,0.06); text-decoration: none; }
.skill-card h3 { margin-bottom: 0.5rem; }
.skill-card p { color: var(--color-muted); font-size: 0.875rem; margin-bottom: 0.75rem; }
.skill-card-meta { display: flex; gap: 0.75rem; font-size: 0.75rem; color: var(--color-muted); margin-bottom: 0.5rem; }
.skill-card-tags { display: flex; gap: 0.25rem; flex-wrap: wrap; }

/* Skill browser controls */
.skill-browser-controls { display: flex; gap: 1rem; margin-bottom: 1rem; align-items: center; }
.skill-browser-search { flex: 1; }
.skill-browser-search input { width: 100%; padding: 0.625rem 1rem; border: 1px solid var(--color-border); border-radius: var(--radius); font-size: 0.9375rem; }
.skill-browser-search input:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1); }
.skill-browser-sort { display: flex; align-items: center; gap: 0.5rem; }
.skill-browser-sort label { font-size: 0.875rem; color: var(--color-muted); white-space: nowrap; }
.skill-browser-sort select { padding: 0.5rem; border: 1px solid var(--color-border); border-radius: var(--radius); font-size: 0.875rem; }

.tag-chips { display: flex; gap: 0.375rem; flex-wrap: wrap; margin-bottom: 1.5rem; }
.tag-chips button { cursor: pointer; border: none; font-family: inherit; }
.tag-chips button:hover { opacity: 0.8; }

.no-results { color: var(--color-muted); text-align: center; padding: 3rem 0; }

/* Opacity for loading state */
.opacity-50 { opacity: 0.5; transition: opacity 0.15s; }

/* Skill detail */
.skill-detail { max-width: 800px; }
.skill-meta { color: var(--color-muted); margin-bottom: 1rem; }
.skill-tags { display: flex; gap: 0.375rem; margin-bottom: 1.5rem; }

.action-list { display: flex; flex-direction: column; gap: 1rem; }
.action-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1rem;
}
.action-card code { font-size: 0.75rem; color: var(--color-muted); }
.action-card .examples { margin-top: 0.5rem; }
.action-card ul { margin-left: 1.5rem; font-size: 0.875rem; color: var(--color-muted); }

/* Docs */
.docs-layout { display: flex; gap: 2rem; }
.docs-sidebar {
    width: 220px;
    flex-shrink: 0;
}
.docs-sidebar h3 { font-size: 0.875rem; color: var(--color-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.75rem; }
.docs-sidebar nav { display: flex; flex-direction: column; gap: 0.25rem; }
.docs-sidebar a {
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    color: var(--color-muted);
}
.docs-sidebar a:hover { background: var(--color-surface); color: var(--color-text); text-decoration: none; }
.docs-sidebar a.active { background: var(--color-primary); color: white; }

.docs-content {
    flex: 1;
    min-width: 0;
    background: var(--color-surface);
    padding: 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}
.docs-content h1 { font-size: 1.75rem; margin-bottom: 1rem; }
.docs-content h2 { font-size: 1.25rem; margin-top: 2rem; margin-bottom: 0.75rem; border-bottom: 1px solid var(--color-border); padding-bottom: 0.5rem; }
.docs-content p { margin-bottom: 1rem; }
.docs-content ul, .docs-content ol { margin-bottom: 1rem; margin-left: 1.5rem; }
.docs-content li { margin-bottom: 0.25rem; }
.docs-content code { background: var(--color-bg); padding: 0.125rem 0.375rem; border-radius: 4px; font-size: 0.875rem; }
.docs-content pre { background: var(--color-bg); padding: 1rem; border-radius: var(--radius); overflow-x: auto; margin-bottom: 1rem; border: 1px solid var(--color-border); }
.docs-content pre code { background: none; padding: 0; }

/* Login */
.login-container {
    max-width: 400px;
    margin: 4rem auto;
    background: var(--color-surface);
    padding: 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}
.login-container h1 { text-align: center; margin-bottom: 2rem; font-size: 1.5rem; }

/* Pre (YAML display) */
pre {
    background: var(--color-bg);
    padding: 1rem;
    border-radius: var(--radius);
    overflow-x: auto;
    font-size: 0.8125rem;
    border: 1px solid var(--color-border);
    margin-bottom: 1rem;
}

/* Featured toggle */
.featured-toggle { cursor: pointer; font-size: 1.25rem; background: none; border: none; }
.featured-toggle:hover { opacity: 0.7; }

/* Actions cell */
.actions { display: flex; gap: 0.5rem; align-items: center; }
.actions form { display: inline; }