* { 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(100% - 32px, var(--tt-maxw, 1040px)); margin: 0 auto; padding: 42px 0 64px; }
.hero { max-width: 760px; margin-bottom: 24px; }
.eyebrow { color: var(--tt-primary, #2563eb); font-size: .82rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 10px; font-size: clamp(2rem, 5vw, 3.4rem); letter-spacing: -.04em; }
.hero p:last-child, small { color: var(--tt-muted, #5d6b82); }
.tool, .result-section, .guide { background: var(--tt-surface, #ffffff); border: 1px solid var(--tt-line, #d9e1ef); border-radius: var(--tt-radius, 12px); box-shadow: var(--tt-shadow, 0 3px 14px rgba(20,40,80,.06)); }
.tool { padding: 22px; }
.fields { display: grid; grid-template-columns: 1fr 150px; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.pattern-field { grid-column: 1; }
.flags-field { grid-column: 2; }
.test-field { grid-column: 1 / -1; }
label { font-size: .9rem; font-weight: 750; }
textarea, input { width: 100%; border: 1px solid var(--tt-line, #d9e1ef); border-radius: 8px; background: var(--tt-surface-soft, #fbfdff); color: var(--tt-text, #172033); font: 500 .95rem ui-monospace, SFMono-Regular, Menlo, monospace; padding: 10px; }
textarea { min-height: 70px; resize: vertical; }
button { margin-top: 18px; border: 0; border-radius: 8px; background: var(--tt-primary, #2563eb); color: #fff; cursor: pointer; font-weight: 750; padding: 11px 18px; }
button:hover { background: var(--tt-primary-dark, #1d4ed8); }
.result-section, .guide { margin-top: 18px; padding: 20px; overflow-x: auto; }
h2 { font-size: 1.15rem; margin-bottom: 14px; }
.empty { color: var(--tt-muted, #5d6b82); margin: 0; }
.notice { border-left: 4px solid var(--tt-danger, #b42318); background: var(--tt-surface-soft, #fbfdff); margin: 8px 0; padding: 10px 12px; }
.notice.warning { border-color: var(--tt-primary, #2563eb); }
.notice strong { display: block; }
table { border-collapse: collapse; width: 100%; min-width: 650px; font-size: .9rem; }
th, td { border-bottom: 1px solid var(--tt-line, #d9e1ef); padding: 10px; text-align: left; vertical-align: top; }
th { color: var(--tt-muted, #5d6b82); font-size: .75rem; letter-spacing: .04em; text-transform: uppercase; }
code, .match-text { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; overflow-wrap: anywhere; }
.match { background: var(--tt-primary-soft, #e9f1ff); border-radius: 8px; margin: 10px 0; padding: 12px; }
.match h3 { font-size: 1rem; margin: 0 0 8px; }
ul { margin: 8px 0 0; padding-left: 20px; }
.guide { line-height: 1.6; }
@media (max-width: 650px) { .page { width: min(100% - 20px, 1040px); padding-top: 24px; } .fields { grid-template-columns: 1fr; } .pattern-field, .flags-field, .test-field { grid-column: 1; } }