:root {
  color-scheme: dark;
  --ground: #101816;
  --surface: #192824;
  --surface-deep: #12201c;
  --rule: #304740;
  --ink: #f0f5f0;
  --muted: #a2b8ad;
  --quiet: #819e8e;
  --accent: #7cdec0;
  --on-accent: #10231b;
  --paper: #254037;
  --paper-ink: #ebf8ef;
  --paper-rule: #527467;
  --paper-muted: #afcfb9;
  --paper-placeholder: #94b3a0;
  --paper-action: #a0eac6;
  --source-placeholder: #86a794;
  --swap-hover: #243c33;
  --error: #ffb3a2;
  --chevron: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='11' height='7' viewBox='0 0 11 7'%3E%3Cpath fill='none' stroke='%237cdec0' stroke-width='1.5' d='m1 1 4.5 4.5L10 1'/%3E%3C/svg%3E");
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --sans: "Helvetica Neue", Helvetica, Arial, ui-sans-serif, sans-serif;
}

:root[data-theme="light"] {
  color-scheme: light;
  --ground: #edf4ee;
  --surface: #f7fbf7;
  --surface-deep: #fffefa;
  --rule: #c8dbce;
  --ink: #14251b;
  --muted: #50695b;
  --quiet: #587263;
  --accent: #237b61;
  --on-accent: #ffffff;
  --paper: #dbece1;
  --paper-ink: #1c3d2c;
  --paper-rule: #b5d1bd;
  --paper-muted: #4d7057;
  --paper-placeholder: #4d7057;
  --paper-action: #216c49;
  --source-placeholder: #5a715d;
  --swap-hover: #e4eee7;
  --error: #a63829;
  --chevron: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='11' height='7' viewBox='0 0 11 7'%3E%3Cpath fill='none' stroke='%23237b61' stroke-width='1.5' d='m1 1 4.5 4.5L10 1'/%3E%3C/svg%3E");
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { min-height: 100%; -webkit-text-size-adjust: 100%; }
body { min-height: 100vh; margin: 0; background: var(--ground); color: var(--ink); font: 400 16px/1.5 var(--sans); -webkit-font-smoothing: antialiased; }
button, select, textarea { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
::selection { background: var(--accent); color: var(--on-accent); }
.visually-hidden { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip-link { position: absolute; z-index: 10; top: -100px; left: 24px; padding: 10px 15px; background: var(--accent); color: var(--on-accent); }
.skip-link:focus { top: 12px; }
.site-shell { width: min(100%, 1500px); min-height: 100vh; margin: 0 auto; padding: 0 clamp(20px, 5.2vw, 80px); display: flex; flex-direction: column; }

.topbar { height: 88px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--rule); }
.brand { display: inline-flex; align-items: center; gap: 13px; color: var(--ink); text-decoration: none; white-space: nowrap; }
.brand-mark { display: block; width: 36px; height: 36px; }
.brand-name { font-weight: 800; font-size: 14px; letter-spacing: .11em; }
.brand-name span { color: var(--accent); }
.brand-divider { width: 1px; height: 18px; margin: 0 5px; background: var(--rule); }
.brand-tool, .topbar-end { font: 600 11px/1 var(--mono); letter-spacing: .12em; }
.brand-tool { color: var(--accent); }
.topbar-end { display: inline-flex; align-items: center; gap: 10px; color: var(--muted); text-transform: uppercase; }
.status-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 14%, transparent); }
.topbar-actions { display: flex; align-items: center; gap: 19px; }
.topbar-link { color: var(--ink); font: 600 12px/1 var(--mono); text-decoration: none; border-bottom: 1px solid var(--rule); padding: 8px 1px; }
.topbar-link:hover, .topbar-link[aria-current="page"] { color: var(--accent); border-color: var(--accent); }
.theme-toggle { width: 36px; height: 36px; display: grid; place-items: center; border: 1px solid var(--rule); border-radius: 50%; background: var(--surface); color: var(--ink); transition: border-color .18s, background .18s; }
.theme-toggle:hover { border-color: var(--accent); background: var(--swap-hover); }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: block; }

main { flex: 1; }
.intro { min-height: 242px; display: grid; grid-template-columns: 135px minmax(0, 1fr) 240px; align-items: end; padding: 42px 0 34px; gap: 20px; position: relative; }
.intro-index { align-self: stretch; padding-top: 13px; display: flex; flex-direction: column; gap: 14px; color: var(--quiet); font: 600 11px/1.4 var(--mono); letter-spacing: .1em; }
.index-rule { display: block; width: 1px; flex: 1; min-height: 45px; margin-left: 2px; background: var(--rule); }
.overline { margin: 0 0 4px; color: var(--accent); font: 600 11px/1.4 var(--mono); letter-spacing: .18em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(68px, 8.8vw, 136px); line-height: .88; letter-spacing: -.088em; font-weight: 600; }
.title-stop { color: var(--accent); }
.intro-deck { margin: 18px 0 0 5px; color: var(--muted); font-size: 17px; letter-spacing: -.02em; }
.intro-art { height: 126px; align-self: end; display: flex; align-items: center; justify-content: flex-end; gap: 12px; overflow: hidden; color: var(--accent); }
.art-word { font-size: 65px; line-height: 1; font-weight: 300; letter-spacing: -.1em; }
.art-word-b { font-size: 61px; }
.art-path { display: block; width: 62px; height: 1px; background: var(--accent); position: relative; opacity: .65; }
.art-path::after { content: ""; position: absolute; right: 0; top: -3px; width: 7px; height: 7px; border-top: 1px solid var(--accent); border-right: 1px solid var(--accent); transform: rotate(45deg); }

.workspace { border: 1px solid var(--rule); }
.workspace-topline { display: flex; justify-content: space-between; padding: 10px 20px; min-height: 35px; background: var(--accent); color: var(--on-accent); font: 700 10px/1.4 var(--mono); letter-spacing: .13em; }
.language-strip { display: grid; grid-template-columns: minmax(0, 1fr) 72px minmax(0, 1fr); align-items: center; background: var(--surface); border-bottom: 1px solid var(--rule); }
.language-control { min-width: 0; display: flex; align-items: center; gap: 18px; padding: 15px 25px; }
.language-control-target { border-left: 1px solid var(--rule); }
.language-control label { flex: 0 0 43px; color: var(--quiet); font: 600 11px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; }
.language-control select { flex: 1; min-width: 0; min-height: 42px; border: 0; padding: 0 24px 0 0; color: var(--ink); background: transparent; font-size: 19px; font-weight: 600; appearance: none; background-image: var(--chevron); background-repeat: no-repeat; background-position: right 6px center; }
.language-control select option { color: var(--ink); background: var(--surface); }
.detected-language { flex: none; padding: 7px 10px; border: 1px solid var(--rule); color: var(--accent); font: 600 11px/1.2 var(--mono); white-space: nowrap; }
.detected-language.is-warning { color: var(--error); border-color: currentColor; }
.swap-button { width: 42px; height: 42px; margin: 0 auto; display: grid; place-items: center; border: 1px solid var(--rule); background: var(--surface-deep); color: var(--accent); transition: background .18s, transform .18s; }
.swap-button:hover { background: var(--swap-hover); transform: rotate(180deg); }

.editor-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.editor { min-width: 0; min-height: 355px; padding: 27px 30px 20px; display: flex; flex-direction: column; }
.editor-source { background: var(--surface-deep); }
.editor-result { background: var(--paper); color: var(--paper-ink); }
.editor-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; }
.editor-heading h2 { margin: 0; font: 600 12px/1.2 var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.language-code { color: var(--quiet); font: 600 11px/1.2 var(--mono); letter-spacing: .1em; }
.editor-result .language-code { color: var(--paper-muted); }
.editor textarea { display: block; flex: 1; width: 100%; min-height: 216px; resize: vertical; border: 0; outline: 0; padding: 26px 0 18px; background: transparent; color: inherit; font-size: clamp(22px, 2vw, 30px); line-height: 1.45; font-weight: 400; letter-spacing: -.035em; }
.editor textarea:focus-visible { box-shadow: inset 0 -2px 0 var(--accent); }
.editor textarea::placeholder { color: var(--source-placeholder); opacity: 1; }
.editor-result textarea::placeholder { color: var(--paper-placeholder); }
.editor-footer { min-height: 34px; padding-top: 12px; display: flex; align-items: center; justify-content: space-between; gap: 12px; border-top: 1px solid var(--rule); color: var(--quiet); font: 500 11px/1.3 var(--mono); }
.editor-result .editor-footer { border-color: var(--paper-rule); color: var(--paper-muted); }
.result-actions { display: flex; align-items: center; gap: 20px; }
.text-button { border: 0; padding: 4px 0; background: transparent; color: var(--accent); font: 600 11px/1.2 var(--mono); letter-spacing: .02em; text-decoration: underline; text-underline-offset: 4px; }
.editor-result .text-button { color: var(--paper-action); }
.text-button:disabled { opacity: .38; text-decoration: none; }
.text-button:not(:disabled):hover { text-decoration-thickness: 2px; }
.editor-result .text-button.is-copied { background: var(--accent); color: var(--on-accent); box-shadow: 0 0 0 4px var(--accent); text-decoration: none; }
.workspace-bottom { min-height: 82px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 14px 20px 14px 30px; background: var(--surface); border-top: 1px solid var(--rule); }
.message { flex: 1; min-width: 0; color: var(--muted); font-size: 13px; line-height: 1.4; }
.message.is-error { color: var(--error); }
.message.is-success { color: var(--accent); }
.share-action { flex: 0 0 auto; display: flex; flex-direction: column; align-items: flex-start; gap: 4px; }
.share-button { min-height: 40px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; padding: 0 13px; border: 1px solid var(--accent); background: transparent; color: var(--accent); font: 700 12px/1.2 var(--sans); transition: background .18s, color .18s; }
.share-button:hover:not(:disabled) { background: var(--accent); color: var(--on-accent); }
.share-button.is-copied { background: var(--accent); color: var(--on-accent); }
.share-button:disabled { border-color: var(--rule); color: var(--muted); }
.share-note { color: var(--muted); font: 500 10px/1.3 var(--mono); }
.translate-button { flex: 0 0 auto; min-width: 190px; min-height: 52px; display: flex; align-items: center; justify-content: space-between; gap: 25px; padding: 0 17px; border: 0; background: var(--accent); color: var(--on-accent); font-weight: 700; font-size: 15px; transition: filter .18s, transform .18s; }
.translate-button:hover:not(:disabled) { filter: brightness(1.12); transform: translateY(-2px); }
.translate-button:disabled { opacity: .55; }
.translate-button span:last-child { font-size: 22px; line-height: 1; }
.under-workspace { padding: 15px 2px 60px; color: var(--quiet); font: 500 11px/1.4 var(--mono); }
.site-footer { min-height: 72px; border-top: 1px solid var(--rule); display: flex; align-items: center; justify-content: space-between; gap: 18px; color: var(--quiet); font: 500 10px/1.4 var(--mono); letter-spacing: .08em; }
.footer-divider { color: var(--accent); padding: 0 5px; }

@media (max-width: 900px) {
  .site-shell { padding: 0 24px; }
  .intro { grid-template-columns: 75px minmax(0, 1fr); min-height: 205px; padding-top: 34px; }
  .intro-art { display: none; }
  h1 { font-size: clamp(64px, 11vw, 100px); }
  .language-control { padding-inline: 17px; gap: 8px; }
  .editor { padding: 23px 22px 18px; }
}
@media (max-width: 650px) {
  .site-shell { padding: 0 16px; }
  .topbar { height: 68px; }
  .brand { gap: 9px; }
  .brand-mark { width: 31px; height: 31px; }
  .brand-name { font-size: 11px; }
  .brand-divider { margin: 0 2px; }
  .brand-tool { font-size: 9px; }
  .topbar-end { display: none; }
  .topbar-actions { gap: 12px; }
  .topbar-link { font-size: 11px; }
  .intro { display: block; min-height: auto; padding: 42px 0 30px; }
  .intro-index { display: none; }
  .intro-art { position: absolute; top: 40px; right: 1px; display: flex; width: 94px; height: 27px; gap: 5px; }
  .intro-art .art-word { font-size: 25px; }
  .intro-art .art-word-b { font-size: 23px; }
  .intro-art .art-path { width: 21px; }
  h1 { font-size: clamp(64px, 14vw, 88px); }
  .intro-deck { margin: 14px 0 0 3px; font-size: 14px; }
  .language-strip { grid-template-columns: minmax(0, 1fr) 46px minmax(0, 1fr); }
  .language-control { display: block; padding: 11px 12px; }
  .language-control label { display: block; margin-bottom: 4px; font-size: 10px; }
  .language-control select { width: 100%; min-height: 33px; font-size: 14px; }
  .detected-language { display: inline-block; margin-top: 6px; padding: 4px 7px; font-size: 10px; }
  .swap-button { width: 32px; height: 32px; }
  .swap-button svg { width: 18px; }
  .editor-grid { grid-template-columns: 1fr; }
  .editor { min-height: 235px; padding: 20px; }
  .editor-result { border-top: 1px solid var(--rule); }
  .editor textarea { min-height: 139px; font-size: 22px; padding-top: 18px; }
  .workspace-bottom { align-items: stretch; flex-direction: column; padding: 15px 19px 18px; gap: 14px; }
  .share-action { order: 1; align-items: stretch; }
  .share-button { width: 100%; }
  .translate-button { width: 100%; min-height: 50px; }
  .site-footer span:last-child { display: none; }
}
@media (max-width: 440px) {
  .brand-divider, .brand-tool { display: none; }
}
@media (max-width: 360px) {
  .topbar { gap: 8px; }
  .topbar-actions { gap: 8px; }
  .theme-toggle { width: 32px; height: 32px; }
  .language-control { padding-inline: 8px; }
  .language-control select { padding-right: 0; background-image: none; font-size: 12px; text-decoration: underline; text-decoration-color: var(--rule); text-underline-offset: 3px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0s !important; animation-duration: 0s !important; }
}