:root{--page:#f2f6fc;--paper:#fff;--ink:#182b49;--muted:#586a84;--line:#dce5f2;--blue:#265de8;--blue-dark:#1b49ba;--blue-soft:#eaf0ff;--green:#18785e;--amber:#936015;--red:#b23950;--radius:22px;font-family:"Microsoft YaHei UI","PingFang SC","Noto Sans CJK SC",system-ui,sans-serif;color:var(--ink);background:var(--page);font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0}button,textarea{font:inherit}button,a,textarea{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.45}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,textarea:focus-visible{outline:3px solid #829efa;outline-offset:4px}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.wrap{width:min(1120px,calc(100% - 72px));margin-inline:auto}
.site-header{height:100px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:12px;font-size:17px;font-weight:750}.brand-mark{width:35px;height:35px;display:grid;place-items:center;background:var(--ink);color:#fff;border-radius:10px;font-size:22px;font-weight:900}.brand-divider{color:#adb9cd;padding-inline:9px;font-weight:400}.brand-product{font-size:13px;font-weight:500;color:var(--muted)}.help-link{font-size:13px;color:var(--muted);padding:12px 0}.help-link span{margin-left:8px;color:var(--blue)}
.workspace{display:grid;grid-template-columns:minmax(290px,.85fr) minmax(0,1.15fr);gap:70px;align-items:center;padding:24px 0 49px}.intro{padding:10px 0 0 10px}.eyebrow{display:flex;align-items:center;gap:9px;font-size:11px;font-weight:750;letter-spacing:1.7px;margin:0 0 21px;color:var(--blue)}.small-dot{width:7px;height:7px;background:var(--blue);border-radius:50%}h1{font-size:clamp(32px,3.6vw,45px);line-height:1.35;letter-spacing:-1.7px;margin:0 0 20px;font-weight:820}h1 span{color:var(--blue)}.intro-copy{font-size:14px;line-height:1.9;color:var(--muted);margin:0}.scope-note{font-size:11px;line-height:1.8;color:var(--muted);margin:10px 0 0}
.mail-illustration{height:173px;width:290px;position:relative;margin:24px 0 2px}.mail-paper{position:absolute;left:37px;top:0;width:205px;height:135px;border:1px solid #c9d8ee;border-radius:9px;background:#fff;transform:rotate(-6deg);padding:24px 24px}.mail-paper i{display:block;width:65px;height:5px;background:#d5e2fa;margin-bottom:9px;border-radius:3px}.mail-paper i:nth-child(2){width:99px}.mail-paper span{position:absolute;right:16px;top:19px;font-family:Arial,sans-serif;font-size:13px;letter-spacing:-.5px;color:#4c6d9f}.mail-envelope{position:absolute;left:10px;bottom:5px;width:260px;height:144px;border:1px solid #adc3e7;border-radius:6px 6px 13px 13px;background:#e1ebfc;overflow:hidden;box-shadow:0 12px 18px -16px #385c9f}.mail-envelope svg{width:100%;height:100%;fill:none;stroke:#adc3e7;stroke-width:1.2}.mail-stamp{position:absolute;bottom:15px;right:-1px;transform:rotate(9deg);background:#fff;border:1.5px solid var(--blue);outline:4px solid var(--page);border-radius:12px;padding:10px 15px;color:var(--blue);text-align:center;box-shadow:0 5px 9px #34588c08}.mail-stamp span{display:block;font-size:10px;letter-spacing:3px;margin-bottom:5px}.mail-stamp strong{font-size:16px;letter-spacing:1px}
.input-panel{background:var(--paper);border:1px solid #e1e8f3;border-radius:var(--radius);padding:31px;box-shadow:0 16px 50px -28px #6382bd42}.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:10px}.panel-heading h2{font-size:19px;margin:0;font-weight:750;letter-spacing:-.4px}.free-badge{white-space:nowrap;background:var(--blue-soft);color:var(--blue-dark);font-size:11px;padding:6px 9px;border-radius:7px;font-weight:600}.input-hint{font-size:12px;color:var(--muted);line-height:1.8;margin:11px 0 18px}.editor{border:1px solid #ced9eb;border-radius:13px;overflow:hidden;transition:border-color .15s,box-shadow .15s;background:#fbfcff}.editor:focus-within{border-color:var(--blue);box-shadow:0 0 0 3px #265de80c}.editor textarea{display:block;width:100%;min-height:200px;max-height:550px;resize:vertical;border:0;background:transparent;padding:18px;font-family:ui-monospace,"Cascadia Mono",Consolas,monospace;font-size:14px;line-height:1.9;color:var(--ink);outline:none}.editor textarea::placeholder{color:#8b99ae}.editor textarea:disabled{opacity:.65}.editor-footer{min-height:40px;padding:0 14px;display:flex;align-items:center;justify-content:space-between;border-top:1px solid #e8eef7;font-size:11px;color:var(--muted);gap:8px}.text-button{border:0;background:none;color:var(--muted);font-size:11px;padding:10px 4px;min-height:40px}.text-button:hover{color:var(--blue)}.privacy-note{display:flex;align-items:flex-start;gap:7px;font-size:11px;line-height:1.7;margin:13px 0 20px;color:var(--muted)}.privacy-note svg{width:14px;height:14px;flex:0 0 14px;margin-top:2px;fill:none;stroke:currentColor;stroke-width:1.4}.submit-row{display:flex;gap:9px}.primary-button{background:var(--blue);color:white;border:1px solid var(--blue);border-radius:11px;min-height:49px;display:flex;align-items:center;justify-content:center;gap:9px;font-weight:650;font-size:15px;flex:1;transition:background .15s,transform .15s}.primary-button:hover:not(:disabled){background:var(--blue-dark);transform:translateY(-1px)}.primary-button:disabled{opacity:.75}.primary-button span:first-child{font-size:21px;line-height:1}.secondary-button{min-height:40px;padding:9px 13px;border:1px solid var(--line);border-radius:9px;color:var(--ink);background:#fff;font-size:12px;font-weight:550;white-space:nowrap}.secondary-button:hover:not(:disabled){border-color:#a8bce8;background:#f6f8ff}.cancel-button{min-width:62px}.data-note{font-size:10px;line-height:1.8;text-align:center;color:var(--muted);margin:13px 0 0}.feedback{background:#fff6e6;color:#7c5013;padding:12px 14px;line-height:1.7;border-radius:9px;font-size:12px;margin:0 0 15px;overflow-wrap:anywhere}.feedback.info{background:var(--blue-soft);color:#2853a2}.spinning{width:16px;height:16px;border:2px solid #ffffff50;border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
.results-section{background:white;border:1px solid #e0e7f2;border-radius:var(--radius);padding:26px 30px;margin-bottom:42px}.results-heading{display:flex;align-items:center;justify-content:space-between;gap:18px}.results-heading h2{font-size:18px;margin:0;letter-spacing:-.3px}.result-total{font-family:Arial,sans-serif;font-size:13px;color:var(--blue);margin-left:6px}.results-heading p{font-size:11px;line-height:1.8;color:var(--muted);margin:7px 0 0}.result-actions{display:flex;gap:8px}.empty-results{text-align:center;padding:32px 0 25px}.empty-symbol{display:block;font-family:Georgia,serif;font-size:38px;color:#9aafcf;line-height:1;margin-bottom:14px}.empty-results p{font-size:13px;color:var(--muted);margin:0 0 8px}.empty-results>span:last-child{font-size:11px;color:var(--muted)}.filters{display:flex;gap:6px;flex-wrap:wrap;margin:22px 0 18px}.filter-button{background:#f3f6fb;border:1px solid transparent;border-radius:8px;min-height:36px;padding:8px 11px;font-size:11px;color:var(--muted)}.filter-button[aria-pressed=true]{color:var(--blue-dark);background:var(--blue-soft);border-color:#c4d4f8}.filter-button b{font-family:Arial,sans-serif;font-size:11px;margin-left:7px}.result-row{display:grid;grid-template-columns:minmax(0,1fr) 145px minmax(0,1.3fr);gap:18px;align-items:start;border-top:1px solid #e8edf5;padding:19px 0;animation:enter .2s ease-out}.result-email{font-family:ui-monospace,"Cascadia Mono",Consolas,monospace;font-size:13px;overflow-wrap:anywhere;line-height:1.65;padding-top:3px}.result-status{display:flex;align-items:center;gap:7px;font-size:12px;font-weight:650;min-height:28px}.state-icon{width:27px;height:27px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;font-family:Arial,sans-serif;font-size:16px;font-weight:600;flex:0 0 27px}.live{color:var(--green)}.state-icon.live{background:#e6f4ee}.verify{color:var(--amber)}.state-icon.verify{background:#fff1d6}.disabled{color:var(--red)}.state-icon.disabled{background:#fdebf0}.unregistered{color:#5d648e}.state-icon.unregistered{background:#eef0f8}.unknown{color:#5d7089}.state-icon.unknown{background:#edf2f7}.result-description{font-size:11px;line-height:1.8;color:var(--muted);margin:2px 0 5px}.result-advice{font-size:11px;line-height:1.8;color:var(--ink);margin:0}.result-note{border-top:1px solid var(--line);padding-top:17px;margin:4px 0 0;font-size:11px;color:var(--muted);line-height:1.8}.no-matches{text-align:center;padding:25px;color:var(--muted);font-size:13px}
.guide-section{margin:0 0 35px;scroll-margin-top:30px}.guide-heading{display:flex;align-items:baseline;gap:18px;margin-bottom:22px}.guide-heading h2{font-size:16px;margin:0}.guide-heading p{font-size:11px;color:var(--muted);margin:0}.guide-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:24px}.guide-grid article{border-top:1px solid #d5dfef;padding-top:20px}.guide-grid h3{font-size:12px;margin:12px 0 9px}.guide-grid p{font-size:11px;line-height:1.9;color:var(--muted);margin:0}.site-footer{padding:24px 0 28px;border-top:1px solid #dce5f2;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:10px;color:var(--muted)}.site-footer>div{display:flex;gap:20px}.site-footer a:hover{color:var(--blue)}.site-footer p{margin:0;flex-basis:100%;font-size:10px;color:#687b97}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);border-radius:11px;background:var(--ink);color:#fff;padding:14px 20px;font-size:13px;box-shadow:0 6px 25px #182b4926;z-index:10;max-width:calc(100% - 30px);text-align:center;line-height:1.6}@keyframes enter{from{opacity:0;transform:translateY(3px)}to{opacity:1;transform:none}}
@media(min-width:1500px){.workspace{padding-top:42px;padding-bottom:62px}.site-header{height:110px}}
@media(max-width:950px){.wrap{width:calc(100% - 48px)}.workspace{gap:30px;grid-template-columns:.8fr 1.2fr}.input-panel{padding:24px}.intro{padding-left:0}h1{font-size:34px}.mail-illustration{transform:scale(.85);transform-origin:left center;width:240px}.panel-heading h2{font-size:17px}.free-badge{font-size:10px}.guide-grid{gap:15px}.result-row{grid-template-columns:minmax(0,1fr) 135px}.result-explanation{grid-column:1/-1}.result-row{row-gap:7px}}
@media(max-width:700px){.wrap{width:calc(100% - 32px)}.site-header{height:77px}.brand{font-size:15px;gap:9px}.brand-mark{width:31px;height:31px;font-size:19px}.brand-divider{padding-inline:5px}.brand-product{font-size:11px}.help-link{font-size:11px}.workspace{display:block;padding:10px 0 24px}.intro{position:relative;padding:5px 0 21px}.eyebrow{font-size:10px;margin-bottom:14px}h1{font-size:32px;letter-spacing:-1px;margin-bottom:13px}.intro-copy{font-size:12px;line-height:1.8;max-width:260px}.scope-note{display:none}.mail-illustration{position:absolute;right:-4px;top:45px;transform:scale(.43);transform-origin:top right;width:290px;height:173px;pointer-events:none;opacity:.85}.intro h1,.intro-copy{position:relative;z-index:1}.input-panel{padding:22px 20px;border-radius:18px;box-shadow:0 10px 30px -20px #6382bd42}.panel-heading h2{font-size:17px}.input-hint{font-size:11px;margin:9px 0 14px}.editor textarea{min-height:176px;font-size:13px}.privacy-note{font-size:10px;margin:12px 0 16px}.data-note{font-size:10px}.results-section{padding:22px 20px;border-radius:18px;margin-bottom:30px}.results-heading{align-items:flex-start;flex-wrap:wrap;gap:14px}.results-heading h2{font-size:17px}.result-actions{width:100%}.result-actions .secondary-button{flex:1}.empty-results{padding:26px 0 8px}.empty-results p{font-size:12px}.empty-results>span:last-child{font-size:10px}.result-row{grid-template-columns:minmax(0,1fr);gap:8px}.result-status{grid-row:1}.result-email{font-size:13px}.result-explanation{grid-column:auto}.result-description,.result-advice{font-size:11px}.filters{gap:6px;margin-top:20px}.filter-button{font-size:10px;padding:7px 9px}.guide-heading{display:block;margin-bottom:17px}.guide-heading h2{font-size:15px}.guide-heading p{margin-top:8px}.guide-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.guide-grid article{padding-top:17px}.guide-grid article:last-child{grid-column:1/-1;display:grid;grid-template-columns:27px 1fr;gap:4px 10px}.guide-grid article:last-child h3{margin:5px 0}.guide-grid article:last-child p{grid-column:2}.site-footer{padding-top:20px;font-size:10px;line-height:1.7}.site-footer>div{gap:14px}.site-footer p{font-size:9px}}
@media(max-width:380px){.mail-illustration{opacity:.35;right:-8px;transform:scale(.36)}.input-panel,.results-section{padding:20px 16px}.panel-heading h2{font-size:15px}.free-badge{padding:5px 6px;font-size:9px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}
.result-description,.result-advice,.guide-grid p{font-size:12px}.result-status,.guide-grid h3{font-size:13px}.result-note a{color:var(--blue-dark);text-decoration:underline;text-underline-offset:3px;white-space:nowrap;margin-left:6px}