:root {
    --ink: #f4f1eb;
    --muted: #a9aaa9;
    --line: rgba(244, 241, 235, .13);
    --surface: #17191d;
    --surface-light: #202329;
    --accent: #e7a85b;
    --accent-bright: #f5c982;
}

* { box-sizing: border-box; }
body {
    min-width: 320px;
    margin: 0;
    color: var(--ink);
    background: #0c0e11;
     font-family: "Oxygen Mono", monospace;
}
body::before {
    position: fixed;
    inset: 0;
    z-index: -1;
    content: '';
    background: radial-gradient(circle at 15% 0%, rgba(231, 168, 91, .15), transparent 32rem), radial-gradient(circle at 90% 100%, rgba(70, 91, 115, .12), transparent 28rem);
}
.app-shell { width: min(1240px, calc(100% - 40px)); margin: 0 auto; padding: 58px 0 32px; }
.hero { max-width: 720px; margin-bottom: 38px; }
.hero__badge, .eyebrow { color: var(--accent-bright); font: 500 .71rem 'Courier New', monospace; letter-spacing: .15em; }
.hero__badge { display: inline-flex; padding: 8px 12px; border: 1px solid rgba(231, 168, 91, .4); border-radius: 100px; }
h1, h2, p { margin: 0; }
h1 { margin: 22px 0 12px; font-size: clamp(2.7rem, 7vw, 5.8rem); line-height: .98; letter-spacing: -.075em; }
h1 span { color: var(--accent); }
.hero p { max-width: 450px; color: var(--muted); font-size: 1.02rem; }
.control-panel { display: flex; align-items: end; justify-content: space-between; gap: 28px; padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: rgba(23, 25, 29, .86); box-shadow: 0 20px 60px rgba(0, 0, 0, .18); }
h2 { margin-top: 7px; font-size: 1.28rem; letter-spacing: -.04em; }
.control-panel__actions { display: flex; align-items: end; gap: 10px; }
label { display: block; margin-bottom: 7px; color: var(--muted); font-size: .76rem; }
select, textarea { color: var(--ink); border: 1px solid var(--line); background: var(--surface-light); font: inherit; }
select { min-width: 205px; padding: 12px 14px; border-radius: 9px; outline: none; cursor: pointer; }
select:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(231, 168, 91, .13); }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 14px; min-height: 45px; padding: 0 17px; border: 0; border-radius: 9px; font: 700 .78rem 'Courier New', monospace; cursor: pointer; transition: transform .2s, background .2s; }
.button:hover { transform: translateY(-2px); }
.button--primary { color: #17130e; background: var(--accent); }
.button--primary:hover { background: var(--accent-bright); }
.button--ghost { color: var(--muted); background: transparent; border: 1px solid var(--line); }
.button--ghost:hover { color: var(--ink); border-color: rgba(244, 241, 235, .35); }
.workspace { display: grid; grid-template-columns: 1fr 42px 1fr; align-items: center; gap: 16px; margin-top: 24px; }
.editor-card { min-width: 0; padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); }
.editor-card--result { border-color: rgba(231, 168, 91, .3); background: linear-gradient(145deg, #1b1e22, #17191d); }
.card-heading { display: flex; align-items: start; justify-content: space-between; margin-bottom: 20px; }
.card-number { display: grid; width: 32px; height: 32px; place-items: center; color: var(--accent); border: 1px solid rgba(231, 168, 91, .35); border-radius: 50%; font: .8rem 'Courier New', monospace; }
textarea { display: block; width: 100%; min-height: 370px; padding: 18px; resize: vertical; border-radius: 10px; outline: none; font: 500 .9rem/1.65 'Courier New', monospace; }
textarea::placeholder { color: #676a6e; }
.helper-text { min-height: 18px; margin-top: 11px; color: #797c80; font-size: .73rem; }
.result-footer { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.button--copy { min-height: 34px; padding: 0 12px; color: var(--accent-bright); border: 1px solid rgba(231, 168, 91, .35); background: transparent; font-size: .7rem; }
.button--copy:hover:not(:disabled) { color: #17130e; background: var(--accent); }
.button--copy:disabled { cursor: not-allowed; opacity: .4; }
.transfer-mark { display: grid; width: 42px; height: 42px; place-items: center; color: var(--accent); border: 1px solid rgba(231, 168, 91, .35); border-radius: 50%; font-size: 1.1rem; }
footer { padding-top: 32px; color: #62656a; text-align: center; font-size: .72rem; }
.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; }
@media (max-width: 820px) {
    .control-panel { align-items: stretch; flex-direction: column; }
    .control-panel__actions { align-items: stretch; flex-wrap: wrap; }
    .field { flex: 1 1 200px; }
    .workspace { grid-template-columns: 1fr; }
    .transfer-mark { margin: -4px auto; transform: rotate(90deg); }
}
@media (max-width: 520px) {
    .app-shell { width: min(100% - 24px, 1240px); padding-top: 32px; }
    .control-panel, .editor-card { padding: 18px; }
    .control-panel__actions .button { flex: 1; }
    .result-footer { align-items: stretch; flex-direction: column; }
    .button--copy { width: 100%; }
    textarea { min-height: 290px; }
}