:root{color-scheme:light;--ink: #253d2c;--muted: #52685a;--faint: #7e9284;--bg: #ffffff;--surface: #f2f8f4;--surface-2: #e7f1ea;--border: #dce9e0;--seal: #2e6f40;--seal-bright: #68ba7f;--seal-soft: #cfffdc;--invalid: #a03232;--invalid-soft: #fdeaea;--invalid-border: #f0cfcf;--font-body: "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;--font-code: "IBM Plex Mono", ui-monospace, monospace;--content-max: 760px}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-body);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;line-height:1.5;min-height:100vh}.mono{font-family:var(--font-code)}:focus-visible{outline:2px solid var(--seal);outline-offset:3px;border-radius:4px}.nav-wrap{position:sticky;top:12px;z-index:100;margin:12px auto 0;max-width:808px;padding:0 24px}.nav-pill{display:flex;align-items:center;justify-content:space-between;height:60px;padding:0 24px;background:#fffffff0;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--border);border-radius:999px;box-shadow:0 12px 32px -16px #253d2c33}.logo{display:flex;align-items:center;gap:10px;font-weight:600;font-size:15px;color:inherit;text-decoration:none}.logo-mark,.logo-mark svg{width:34px;height:34px;display:block;flex-shrink:0}.logo-tag{font-size:12px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--seal);background:var(--seal-soft);border-radius:999px;padding:3px 10px}.mock-badge{font-size:12px;color:var(--muted);background:var(--surface-2);border:1px dashed var(--border);border-radius:999px;padding:3px 10px}.wrap{max-width:var(--content-max);margin:0 auto;padding:56px 24px 48px}.intro h1{font-size:clamp(30px,5.5vw,42px);font-weight:700;letter-spacing:-.02em;margin-bottom:12px}.intro p{color:var(--muted);font-size:16px;max-width:56ch}.verify-card{margin-top:28px;background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:24px}.field-label{display:flex;align-items:center;gap:10px;font-size:13px;font-weight:600;letter-spacing:.03em;text-transform:uppercase;color:var(--muted);margin-bottom:10px}.format-chip{font-size:11px;font-weight:600;letter-spacing:.02em;text-transform:none;color:var(--seal);background:var(--seal-soft);border-radius:999px;padding:2px 10px}textarea{width:100%;resize:vertical;min-height:150px;font-size:13px;line-height:1.6;color:var(--ink);background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:14px 16px;transition:border-color .15s ease,box-shadow .15s ease}textarea::placeholder{color:var(--faint)}textarea:focus{outline:none;border-color:var(--seal-bright);box-shadow:0 0 0 3px var(--seal-soft)}.actions{display:flex;align-items:center;gap:12px;margin-top:16px}.btn-primary{display:inline-flex;align-items:center;gap:10px;background:var(--seal);color:#fff;border:none;border-radius:999px;padding:12px 26px;font-size:15px;font-weight:600;cursor:pointer;transition:background .15s ease,transform .1s ease}.btn-primary:hover:not(:disabled){background:#275e37}.btn-primary:active:not(:disabled){transform:scale(.98)}.btn-primary:disabled{opacity:.55;cursor:not-allowed}.btn-ghost{background:none;border:none;color:var(--muted);font-size:14px;font-weight:500;cursor:pointer;padding:10px 14px;border-radius:999px;transition:color .15s ease,background .15s ease}.btn-ghost:hover{color:var(--ink);background:var(--surface-2)}.spinner{width:16px;height:16px;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.samples{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:16px;font-size:13px;color:var(--muted)}.samples button{font-family:var(--font-code);font-size:12px;color:var(--seal);background:var(--bg);border:1px solid var(--border);border-radius:999px;padding:4px 12px;cursor:pointer;transition:background .15s ease,border-color .15s ease}.samples button:hover{background:var(--seal-soft);border-color:var(--seal-bright)}.result{margin-top:24px;border-radius:20px;border:1px solid var(--border);padding:24px;animation:rise .25s ease}@keyframes rise{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.result-valid{background:var(--seal-soft);border-color:var(--seal-bright)}.result-invalid{background:var(--invalid-soft);border-color:var(--invalid-border)}.result-error{background:var(--surface)}.result-status{display:flex;gap:16px;align-items:flex-start}.result-icon{flex-shrink:0;width:44px;height:44px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:var(--bg)}.result-icon svg{width:24px;height:24px}.result-valid .result-icon{color:var(--seal)}.result-invalid .result-icon{color:var(--invalid)}.result-error .result-icon{color:var(--muted)}.result h2{font-size:20px;font-weight:700;letter-spacing:-.01em}.result-valid h2{color:var(--seal)}.result-invalid h2{color:var(--invalid)}.result-reason{margin-top:4px;font-size:14px;color:var(--muted)}.details{margin-top:20px;border-top:1px solid rgba(37,61,44,.12);padding-top:8px}.detail-row{display:grid;grid-template-columns:180px 1fr;gap:16px;padding:10px 0;border-bottom:1px solid rgba(37,61,44,.08);font-size:14px}.detail-row:last-child{border-bottom:none}.detail-row dt{color:var(--muted);font-weight:500}.detail-row dd{word-break:break-word}.detail-row dd.mono{font-size:13px}.footer{max-width:var(--content-max);margin:0 auto;padding:0 24px 40px;color:var(--faint);font-size:13px}@media (max-width: 640px){.wrap{padding-top:40px}.verify-card{padding:18px}.detail-row{grid-template-columns:1fr;gap:2px}.actions{flex-wrap:wrap}.btn-primary{width:100%;justify-content:center}}