:root {
    --bg: #f1f5f9;
    --card: #ffffff;
    --primary: #3b82f6;
    --primary-dark: #1d4ed8;
    --text: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
    --hit: #16a34a;
    --hit-bg: #f0fdf4;
    --miss: #dc2626;
    --miss-bg: #fef2f2;
    --warn: #d97706;
    --warn-bg: #fffbeb;
    --info: #0891b2;
    --info-bg: #ecfeff;
    --radius: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Nav */
.topnav {
    background: var(--text);
    color: #fff;
    display: flex;
    align-items: center;
    gap: 2rem;
    padding: 0 1.5rem;
    height: 56px;
    position: sticky;
    top: 0;
    z-index: 100;
}
.topnav-brand {
    color: #fff;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    white-space: nowrap;
}
.topnav-links { display: flex; gap: .25rem; }
.topnav-links a {
    color: #94a3b8;
    text-decoration: none;
    padding: .4rem .75rem;
    border-radius: var(--radius);
    font-size: .875rem;
    transition: background .15s, color .15s;
}
.topnav-links a:hover { color: #fff; background: rgba(255,255,255,.1); }
.topnav-links a.active { color: #fff; background: var(--primary); }

/* Layout */
.container { max-width: 1200px; margin: 0 auto; padding: 2rem 1.5rem; flex: 1; width: 100%; }

/* Cards */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}
.card h2 { font-size: 1.15rem; margin-bottom: 1rem; }

/* Tools grid (home) */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}
.tool-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem;
    text-decoration: none;
    color: var(--text);
    transition: box-shadow .2s, transform .15s;
    display: block;
}
.tool-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,.08);
    transform: translateY(-2px);
}
.tool-card h2 { font-size: 1.1rem; color: var(--primary-dark); margin-bottom: .5rem; }
.tool-card p { color: var(--text-light); font-size: .9rem; }
.tool-icon {
    width: 48px; height: 48px;
    background: var(--primary);
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 1rem;
    color: #fff; font-size: 1.4rem; font-weight: 700;
}

/* Forms */
.form-row { display: flex; gap: 1rem; flex-wrap: wrap; align-items: flex-end; }
.form-group { display: flex; flex-direction: column; gap: .35rem; flex: 1; min-width: 200px; }
.form-group label { font-size: .8rem; font-weight: 600; color: var(--text-light); text-transform: uppercase; letter-spacing: .03em; }
.form-group input {
    padding: .6rem .75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: .95rem;
    transition: border-color .15s;
}
.form-group input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59,130,246,.15); }
.btn {
    padding: .6rem 1.5rem;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: .95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background .15s;
    white-space: nowrap;
    height: fit-content;
}
.btn:hover { background: var(--primary-dark); }

/* Summary bar */
.summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.summary-item {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    text-align: center;
}
.summary-item .value { font-size: 1.6rem; font-weight: 700; }
.summary-item .label { font-size: .75rem; color: var(--text-light); text-transform: uppercase; letter-spacing: .04em; }

/* Score */
.score-good .value { color: var(--hit); }
.score-warn .value { color: var(--warn); }
.score-bad .value { color: var(--miss); }

/* Resource table */
.resource-table { width: 100%; border-collapse: collapse; font-size: .85rem; }
.resource-table th {
    text-align: left;
    padding: .6rem .75rem;
    background: var(--bg);
    font-size: .75rem;
    text-transform: uppercase;
    letter-spacing: .03em;
    color: var(--text-light);
    border-bottom: 2px solid var(--border);
    position: sticky;
    top: 56px;
}
.resource-table td {
    padding: .55rem .75rem;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}
.resource-table tr:hover td { background: #f8fafc; }
.resource-url {
    max-width: 350px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-family: "SF Mono", Monaco, Consolas, monospace;
    font-size: .8rem;
}
.resource-url a {
    color: var(--text);
    text-decoration: none;
}
.resource-url a:hover {
    color: var(--primary);
    text-decoration: underline;
}

/* Badges */
.badge {
    display: inline-block;
    padding: .15rem .55rem;
    border-radius: 999px;
    font-size: .75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .03em;
}
.badge-hit { background: var(--hit-bg); color: var(--hit); }
.badge-miss { background: var(--miss-bg); color: var(--miss); }
.badge-warn { background: var(--warn-bg); color: var(--warn); }
.badge-info { background: var(--info-bg); color: var(--info); }
.badge-type {
    background: var(--bg);
    color: var(--text-light);
    font-size: .7rem;
}

/* Recommendations */
.reco { padding: .75rem 1rem; border-radius: var(--radius); margin-bottom: .75rem; border-left: 4px solid; font-size: .9rem; }
.reco-critical { border-color: var(--miss); background: var(--miss-bg); }
.reco-warning { border-color: var(--warn); background: var(--warn-bg); }
.reco-info { border-color: var(--info); background: var(--info-bg); }
.reco-good { border-color: var(--hit); background: var(--hit-bg); }
.reco strong { display: block; margin-bottom: .2rem; }

/* Section toggle */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
    padding: .75rem 0;
}
.section-header h3 { font-size: 1rem; }
.section-count { font-size: .8rem; color: var(--text-light); }

/* Checkbox grid */
.checkbox-grid { display: flex; flex-direction: column; gap: 1rem; }
.checkbox-grid-title { font-size: .8rem; font-weight: 600; color: var(--text-light); text-transform: uppercase; letter-spacing: .03em; display: block; margin-bottom: .4rem; }
.checkbox-row { display: flex; flex-wrap: wrap; gap: .25rem .75rem; }
.checkbox-label { font-size: .875rem; cursor: pointer; display: inline-flex; align-items: center; gap: .3rem; white-space: nowrap; }
.checkbox-label .text-light { font-size: .75rem; color: var(--text-light); }
.text-light { color: var(--text-light); }

/* DNS record values */
.dns-record-value {
    font-family: "SF Mono", Monaco, Consolas, monospace;
    font-size: .83rem;
    padding: .1rem 0;
    word-break: break-all;
}

/* Progress bar */
.progress-bar-track {
    width: 100%;
    height: 12px;
    background: var(--border);
    border-radius: 999px;
    overflow: hidden;
}
.progress-bar-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 999px;
    transition: width .3s ease;
    min-width: 0;
}

/* Timeline chart */
.timeline-chart { position: relative; }
.timeline-bars {
    display: flex;
    align-items: flex-end;
    gap: 1px;
    height: 120px;
    padding-bottom: 2px;
}
.timeline-bar-wrap {
    flex: 1;
    min-width: 2px;
    height: 100%;
    display: flex;
    align-items: flex-end;
}
.timeline-bar {
    width: 100%;
    background: var(--primary);
    border-radius: 2px 2px 0 0;
    min-height: 1px;
    transition: height .2s;
}
.timeline-bar-err { background: var(--miss); }
.timeline-axis {
    display: flex;
    justify-content: space-between;
    font-size: .7rem;
    color: var(--text-light);
    margin-top: .3rem;
}

/* Error */
.error-box { background: var(--miss-bg); border: 1px solid var(--miss); color: var(--miss); padding: 1rem; border-radius: var(--radius); margin-bottom: 1rem; }

/* Footer */
.site-footer { text-align: center; padding: 1.5rem; color: var(--text-light); font-size: .8rem; }

/* Responsive */
@media (max-width: 768px) {
    .form-row { flex-direction: column; }
    .form-group { min-width: 100%; }
    .resource-table { display: block; overflow-x: auto; }
    .summary { grid-template-columns: repeat(2, 1fr); }
}