:root { font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif; color: #10283a; background: #eff7f9; font-synthesis: none; --bs-primary: #007f86; --bs-primary-rgb: 0, 127, 134; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: radial-gradient(circle at 86% 14%, #d4f0ec 0, transparent 37%), radial-gradient(circle at 4% 85%, #d8e9f6 0, transparent 40%), #eff7f9; }
.page { max-width: 1100px; margin: 0 auto; min-height: 100vh; display: grid; align-content: center; grid-template-columns: minmax(0, 1fr) minmax(380px, 510px); column-gap: clamp(32px, 7vw, 100px); padding: 66px 32px; }
.checker { grid-column: 1 / -1; padding: clamp(24px, 4vw, 48px); margin-bottom: 70px; background: #fff; border-radius: 22px; box-shadow: 0 24px 70px rgba(14, 66, 84, .10); }
.checker h1 { font-size: clamp(30px, 4vw, 48px); line-height: 1.12; letter-spacing: -.04em; margin: 15px 0; }
.checker h1 em { color: #0b8d93; font-style: normal; }
.checker-intro p { max-width: 720px; line-height: 1.6; color: #506a76; }
.checker-form { padding: 16px 0; max-width: 760px; }
.checker-grid { margin-bottom: 6px; }
.checker-form label { display: block; margin: 18px 0 7px; }
.checker-form .form-control, .checker-form .form-select { min-height: 48px; border-color: #b9cbd2; color: #10283a; }
.checker-form .form-control:focus, .checker-form .form-select:focus { border-color: #007d80; box-shadow: 0 0 0 .25rem #a7e5e2; }
.checker-form .form-control.is-invalid, .checker-form .form-select.is-invalid { border-color: var(--bs-form-invalid-border-color); }
.checker-actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 22px; }
.checker-actions .btn-primary { --bs-btn-bg: #007f86; --bs-btn-border-color: #007f86; --bs-btn-hover-bg: #00666d; --bs-btn-hover-border-color: #00666d; --bs-btn-active-bg: #00545a; --bs-btn-active-border-color: #00545a; font-weight: 700; padding: 14px 22px; }
.checker-actions button:disabled { opacity: .65; cursor: wait; }
.checker-actions button:focus-visible { outline: 3px solid #10283a; outline-offset: 3px; }
.availability, .checker-note { color: #566e78; font-size: 13px; line-height: 1.5; }
.availability .spinner-border { margin-right: 6px; vertical-align: -.15em; }
#availability-spinner[hidden] { display: none; }
.check-output:not(:empty) { border-radius: 12px; padding: 18px 22px; margin: 12px 0; background: #edf7f7; border-left: 4px solid #007f86; }
.check-output[data-kind="error"] { background: #fff2ec; border-left-color: #ad4d24; }
.check-output[data-kind="success"] { background: #e6f6eb; border-left-color: #177341; }
.check-output h2 { margin: 0 0 8px; font-size: 19px; }
.check-output h2 .fa-solid { margin-right: 5px; }
.check-output p { margin: 6px 0; line-height: 1.55; overflow-wrap: anywhere; }
.check-output a { color: #075974; font-weight: 700; }
.checker-note { margin: 10px 0 0; }
.network-progress { max-width: 760px; padding: 12px 15px; margin: 4px 0 16px; border-radius: 9px; background: #edf7f7; color: #294b58; }
.network-progress .progress { height: 7px; background: #d4e5e6; }
.network-progress .progress-bar { background: #007f86; transition: width .2s ease; }
.network-progress small { display: block; margin-top: 7px; }
.network-progress .spinner-border, .status .spinner-border { margin-right: 7px; vertical-align: -.12em; }
#check-progress[hidden], #calc-spinner[hidden] { display: none; }
.checker .btn-outline-secondary { --bs-btn-color: #264856; --bs-btn-border-color: #72939d; --bs-btn-hover-bg: #264856; --bs-btn-hover-border-color: #264856; }
.check-output .btn { margin: 12px 8px 0 0; }
.intro { align-self: center; }
.eyebrow { display: inline-block; color: #007d80; font-size: 11px; font-weight: 800; letter-spacing: .18em; }
.archive-title { font-size: clamp(42px, 5vw, 68px); line-height: 1.09; letter-spacing: -.055em; margin: 22px 0 24px; font-weight: 750; }
.archive-title em { color: #0b8d93; font-weight: 650; font-style: normal; }
.intro p { max-width: 345px; color: #607484; font-size: 16px; line-height: 1.7; }
.card { background: #fff; border-radius: 22px; box-shadow: 0 24px 70px rgba(14, 66, 84, .10), 0 1px 4px rgba(14, 66, 84, .04); overflow: hidden; }
.card-top { display: flex; align-items: center; gap: 10px; padding: 27px 32px; font-size: 11px; font-weight: 800; letter-spacing: .12em; border-bottom: 1px solid #edf2f4; }
.live-dot { width: 8px; height: 8px; border-radius: 50%; background: #1db6a8; }
.card-id { margin-left: auto; color: #4d646f; }
form { padding: 32px; }
.field { border: 1px solid #dce8e9; border-radius: 12px; padding: 18px 20px 14px; transition: border-color .2s; }
.field:focus-within { border-color: #0c9ba2; box-shadow: 0 0 0 3px #0c9ba21c; }
label { color: #485f68; font-size: 12px; font-weight: 700; letter-spacing: .055em; text-transform: uppercase; }
.input-row { display: flex; align-items: center; gap: 12px; margin-top: 8px; }
.input-row .form-control { min-width: 0; font-size: 26px; font-weight: 700; }
.input-row .form-select { max-width: 50%; flex: none; background-color: #edf7f7; color: #056d73; font-size: 13px; font-weight: 750; cursor: pointer; }
.hint { display: block; min-height: 17px; margin-top: 4px; color: #485f68; font-size: 11px; }
.divider { display: flex; align-items: center; gap: 12px; color: #0c9ba2; padding: 13px 0; }
.divider:before, .divider:after { content: ''; height: 1px; background: #e4edef; flex: 1; }
.divider span { display: grid; place-items: center; border: 1px solid #dcebed; border-radius: 50%; width: 36px; height: 36px; font-size: 21px; }
.receive { background: #f7fbfb; }
.receive input { color: #007f86; }
.status { margin: 4px 0 0; min-height: 17px; color: #485f68; font-size: 11px; }
.card-footer { display: flex; justify-content: space-between; gap: 12px; padding: 22px 32px; border-top: 1px solid #edf2f4; color: #485f68; font-size: 10px; letter-spacing: .04em; }
.card-footer span:last-child { color: #85501e; font-weight: 700; }
.footnote { grid-column: 1 / -1; margin: 40px 0 0; color: #566e78; font-size: 12px; text-align: center; }
@media (max-width: 800px) { .page { max-width: 540px; display: block; padding: 45px 20px; } .checker { margin-bottom: 38px; } .intro { margin-bottom: 34px; } .archive-title { margin: 15px 0; } .intro p { margin-bottom: 0; } .footnote { line-height: 1.6; } }
@media (max-width: 500px) { .checker-form .form-control { font-size: 14px; } }
@media (max-width: 430px) { .page { padding: 25px 12px; } .card-top, #calculator, .card-footer { padding-left: 18px; padding-right: 18px; } .field { padding: 14px; } .input-row { gap: 3px; } .input-row .form-control { font-size: 20px; } .input-row .form-select { max-width: 52%; font-size: 11px; } .card-footer { flex-wrap: wrap; } }