* { box-sizing: border-box; }
body { margin: 0; background: var(--tt-bg, #f5f7fb); color: var(--tt-text, #172033); font-family: var(--tt-font, system-ui, sans-serif); }
.page { width: min(1100px, calc(100% - 32px)); margin: 0 auto; padding: 36px 0 56px; }
.hero { max-width: 760px; margin-bottom: 24px; }
.eyebrow { color: var(--tt-primary, #2563eb); font-weight: 700; margin: 0 0 8px; font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; }
h1 { margin: 0; font-size: clamp(2rem, 4vw, 3rem); line-height: 1.08; }
h2 { font-size: 1.05rem; margin: 0 0 10px; }
p { line-height: 1.55; color: var(--tt-muted, #5d6b82); }
code { font-family: ui-monospace, monospace; font-size: .93em; }
.tool-card, .info-grid article { border: 1px solid var(--tt-line, #d9e1ef); background: var(--tt-surface, #ffffff); border-radius: var(--tt-radius, 12px); box-shadow: var(--tt-shadow, 0 8px 24px rgba(23,32,51,.07)); }
.tool-card { padding: 20px; }
.editor-head, .diagnostic-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.editor-head label { font-weight: 750; }
button { border: 0; border-radius: 8px; color: #fff; background: var(--tt-primary, #2563eb); font: inherit; font-weight: 700; padding: 9px 13px; cursor: pointer; }
button:hover { background: var(--tt-primary-dark, #1d4ed8); }
textarea { display: block; margin-top: 12px; min-height: 390px; width: 100%; resize: vertical; border: 1px solid var(--tt-line, #d9e1ef); border-radius: 8px; background: var(--tt-surface-soft, #fbfdff); color: var(--tt-text, #172033); padding: 14px; font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; tab-size: 2; }
textarea:focus { outline: 3px solid var(--tt-primary-soft, #e9f1ff); border-color: var(--tt-primary, #2563eb); }
.result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 14px 0; }
.syntax-panel, .summary-panel { border-radius: 8px; background: var(--tt-surface-soft, #fbfdff); padding: 12px; border: 1px solid var(--tt-line, #d9e1ef); }
.panel-label { margin: 0 0 4px; font-size: .82rem; }
.diagnostic-panel { border-top: 1px solid var(--tt-line, #d9e1ef); padding-top: 16px; }
#validation-result { font-weight: 750; }
.pass { color: var(--tt-success, #087443); }
.fail { color: var(--tt-danger, #b42318); }
.issue { display: grid; grid-template-columns: auto auto 1fr; align-items: start; gap: 8px; padding: 10px 0; border-top: 1px solid var(--tt-line, #d9e1ef); font-size: .92rem; }
.badge { border-radius: 999px; color: #fff; font-size: .72rem; padding: 3px 7px; font-weight: 750; text-transform: uppercase; }
.badge.error { background: var(--tt-danger, #b42318); }.badge.warning { background: var(--tt-primary, #2563eb); }
.location { color: var(--tt-muted, #5d6b82); white-space: nowrap; }
.empty { margin: 4px 0; color: var(--tt-success, #087443); font-weight: 700; }
.info-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 24px; }
.info-grid article { padding: 18px; }
.info-grid p { margin: 0 0 10px; font-size: .92rem; }
@media (max-width: 760px) { .page { width: min(100% - 20px, 1100px); padding-top: 20px; }.tool-card { padding: 14px; }.result-grid, .info-grid { grid-template-columns: 1fr; } textarea { min-height: 330px; }.issue { grid-template-columns: auto 1fr; }.issue span:last-child { grid-column: 1 / -1; } }