:root {
  color-scheme: dark;
  --bg: #0b0f17;
  --panel: #111824;
  --panel-raised: #151e2c;
  --field: #090d14;
  --line: #273244;
  --line-strong: #3b4b62;
  --text: #f1f5f9;
  --muted: #7e8da3;
  --muted-strong: #a9b6c8;
  --cyan: #70e2de;
  --cyan-soft: rgba(112, 226, 222, 0.12);
  --violet: #aa98ff;
  --violet-soft: rgba(170, 152, 255, 0.12);
  --orange: #ff9c6e;
  --green: #6ee7a8;
  --red: #ff6d76;
  --shadow: rgba(0, 0, 0, 0.24);
}

body.light {
  color-scheme: light;
  --bg: #edf1f4;
  --panel: #f9fbfc;
  --panel-raised: #ffffff;
  --field: #f3f6f8;
  --line: #ccd5df;
  --line-strong: #98a8ba;
  --text: #17202b;
  --muted: #69798b;
  --muted-strong: #4d5c6c;
  --cyan: #087d7b;
  --cyan-soft: rgba(8, 125, 123, 0.1);
  --violet: #6751d6;
  --violet-soft: rgba(103, 81, 214, 0.1);
  --orange: #c65327;
  --green: #138352;
  --red: #c73d48;
  --shadow: rgba(35, 51, 69, 0.09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 8% -10%, rgba(112, 226, 222, 0.08), transparent 29rem),
    radial-gradient(circle at 95% 42%, rgba(170, 152, 255, 0.05), transparent 25rem),
    var(--bg);
  color: var(--text);
  font-family: "Space Grotesk", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  transition: background-color 0.2s, color 0.2s;
}

button, input, select { font: inherit; }
button, select { cursor: pointer; }
button { color: inherit; }
.app { width: min(1220px, calc(100% - 48px)); margin: 0 auto; }

.topbar {
  height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}

.brand { display: flex; align-items: center; gap: 12px; color: var(--text); text-decoration: none; font-size: 13px; font-weight: 700; letter-spacing: 0.17em; }
.brand-mark { width: 32px; height: 30px; display: flex; align-items: center; justify-content: center; gap: 1px; border: 1px solid var(--line-strong); background: var(--panel); font: 600 10px "IBM Plex Mono", monospace; }
.brand-mark i { color: var(--cyan); font-style: normal; }
.brand-mark b { color: var(--orange); }
.top-actions { display: flex; align-items: center; gap: 20px; }
.local-status { color: var(--muted); font: 500 10px "IBM Plex Mono", monospace; letter-spacing: 0.12em; }
.local-status i { width: 6px; height: 6px; display: inline-block; margin-right: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 9px var(--green); }
.square-button { width: 36px; height: 36px; display: grid; place-items: center; border: 1px solid var(--line); background: transparent; }
.square-button:hover { border-color: var(--line-strong); background: var(--panel); }
.square-button svg { width: 17px; fill: none; stroke: currentColor; stroke-width: 1.6; }

.intro { min-height: 174px; display: flex; align-items: flex-end; justify-content: space-between; gap: 48px; padding: 40px 0 31px; }
.eyebrow, .card-label { margin: 0; color: var(--muted); font: 500 9px "IBM Plex Mono", monospace; letter-spacing: 0.15em; }
.intro h1 { max-width: 760px; margin: 8px 0 0; font-size: clamp(33px, 4.4vw, 58px); font-weight: 500; line-height: 1; letter-spacing: -0.045em; }
.intro > p { width: min(360px, 36%); margin: 0 0 3px; color: var(--muted-strong); font-size: 13px; line-height: 1.65; }

.expression-card { border: 1px solid var(--line); background: var(--panel); box-shadow: 0 18px 50px var(--shadow); }
.section-head { min-height: 46px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 0 18px; border-bottom: 1px solid var(--line); }
.section-head > label { color: var(--muted); font: 500 9px "IBM Plex Mono", monospace; letter-spacing: 0.15em; }
.text-actions { display: flex; align-items: center; gap: 9px; color: var(--line-strong); }
.text-actions button { padding: 5px 0; border: 0; background: transparent; color: var(--muted); font: 500 9px "IBM Plex Mono", monospace; letter-spacing: 0.08em; }
.text-actions button:hover { color: var(--text); }

.expression-entry { min-height: 104px; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 17px; padding: 16px 16px 16px 20px; border-bottom: 1px solid var(--line); background: var(--field); }
.prompt { color: var(--cyan); font: 500 22px "IBM Plex Mono", monospace; }
#expressionInput { width: 100%; min-width: 0; padding: 8px 0; border: 0; outline: 0; background: transparent; color: var(--text); font: 500 clamp(20px, 3.1vw, 34px)/1.25 "IBM Plex Mono", monospace; letter-spacing: 0.015em; }
#expressionInput::placeholder { color: var(--muted); }
#expressionInput:focus { text-shadow: 0 0 24px var(--cyan-soft); }
.primary-button { width: 166px; height: 46px; display: flex; align-items: center; justify-content: space-between; padding: 0 15px; border: 0; background: var(--cyan); color: #061414; font-size: 8px; font-weight: 700; letter-spacing: 0.1em; }
.primary-button b { font-size: 17px; font-weight: 400; }
.primary-button:hover { filter: brightness(1.08); }
.expression-footer { min-height: 48px; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 0 18px; color: var(--muted); font: 500 8px "IBM Plex Mono", monospace; letter-spacing: 0.08em; }
.validity { display: flex; align-items: center; gap: 7px; text-align: right; }
.validity i { width: 6px; height: 6px; flex: 0 0 auto; border-radius: 50%; }
.validity.is-valid { color: var(--green); }
.validity.is-valid i { background: var(--green); box-shadow: 0 0 8px var(--green); }
.validity.is-error { color: var(--red); }
.validity.is-error i { background: var(--red); }

.position-strip { display: grid; grid-template-columns: repeat(5, 1fr); margin-top: 16px; border: 1px solid var(--line); background: var(--panel); }
.position-strip > div { min-width: 0; min-height: 70px; display: grid; grid-template-columns: auto 1fr; align-content: center; gap: 4px 10px; padding: 12px 14px; border-right: 1px solid var(--line); }
.position-strip > div:last-child { border-right: 0; }
.position-strip span { color: var(--cyan); font: 500 8px "IBM Plex Mono", monospace; }
.position-strip strong { color: var(--muted-strong); font: 600 9px "IBM Plex Mono", monospace; letter-spacing: 0.08em; }
.position-strip small { grid-column: 2; overflow: hidden; color: var(--muted); font: 400 7px "IBM Plex Mono", monospace; letter-spacing: 0.06em; text-overflow: ellipsis; white-space: nowrap; }

.workspace { display: grid; grid-template-columns: minmax(0, 1.75fr) minmax(310px, 0.85fr); gap: 16px; margin-top: 16px; }
.builder-column, .preview-column { min-width: 0; display: flex; flex-direction: column; gap: 16px; }
.builder-panel, .presets-panel, .summary-card, .runs-card, .syntax-card { border: 1px solid var(--line); background: var(--panel); }
.panel-head { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 0 17px; border-bottom: 1px solid var(--line); }
.panel-head > div { display: flex; align-items: center; gap: 14px; }
.panel-index { color: var(--cyan); font: 600 11px "IBM Plex Mono", monospace; }
.violet-ink { color: var(--violet); }
.panel-head p { margin: 0 0 5px; color: var(--muted); font: 500 8px "IBM Plex Mono", monospace; letter-spacing: 0.11em; }
.panel-head h2 { margin: 0; font-size: 14px; font-weight: 500; }
.panel-note { color: var(--muted); font: 500 8px "IBM Plex Mono", monospace; letter-spacing: 0.07em; }

.field-list { padding: 0 17px; }
.field-row { display: grid; grid-template-columns: 120px minmax(130px, 1fr) auto; align-items: center; gap: 15px; min-height: 91px; padding: 13px 0; border-bottom: 1px solid var(--line); }
.field-row:last-child { border-bottom: 0; }
.field-title { display: flex; align-items: center; gap: 12px; }
.field-title > span { color: var(--muted); font: 500 8px "IBM Plex Mono", monospace; }
.field-title label { display: block; margin-bottom: 5px; color: var(--muted-strong); font: 600 9px "IBM Plex Mono", monospace; letter-spacing: 0.09em; }
.field-title small { display: block; color: var(--muted); font: 400 7px "IBM Plex Mono", monospace; letter-spacing: 0.06em; }
.field-input { width: 100%; min-width: 0; height: 42px; padding: 0 13px; border: 1px solid var(--line); outline: 0; background: var(--field); color: var(--text); font: 500 12px "IBM Plex Mono", monospace; }
.field-input:focus { border-color: var(--cyan); box-shadow: 0 0 0 2px var(--cyan-soft); }
.field-row.is-error .field-input { border-color: var(--red); }
.quick-values { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 5px; max-width: 205px; }
.quick-values button { min-height: 27px; padding: 0 8px; border: 1px solid var(--line); background: transparent; color: var(--muted); font: 500 7px "IBM Plex Mono", monospace; letter-spacing: 0.05em; }
.quick-values button:hover { border-color: var(--cyan); color: var(--cyan); background: var(--cyan-soft); }
.field-error { grid-column: 2 / -1; min-height: 0; margin: -7px 0 0; color: var(--red); font: 400 8px/1.35 "IBM Plex Mono", monospace; }
.field-error:empty { display: none; }

.compact-head { min-height: 63px; }
.preset-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.preset-grid button { min-width: 0; min-height: 76px; display: flex; flex-direction: column; align-items: flex-start; justify-content: center; gap: 8px; padding: 13px 16px; border: 0; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: transparent; text-align: left; }
.preset-grid button:nth-child(3n) { border-right: 0; }
.preset-grid button:nth-last-child(-n+3) { border-bottom: 0; }
.preset-grid button:hover { background: var(--violet-soft); }
.preset-grid span { color: var(--muted); font: 500 7px "IBM Plex Mono", monospace; letter-spacing: 0.08em; }
.preset-grid code { max-width: 100%; overflow: hidden; color: var(--muted-strong); font: 500 10px "IBM Plex Mono", monospace; text-overflow: ellipsis; white-space: nowrap; }

.summary-card { min-height: 237px; padding: 18px; position: relative; overflow: hidden; }
.summary-card::after { content: ""; width: 150px; height: 150px; position: absolute; right: -70px; bottom: -80px; border: 1px solid var(--line); border-radius: 50%; }
.summary-icon { width: 42px; height: 42px; display: grid; place-items: center; margin: 23px 0 17px; border: 1px solid var(--cyan); background: var(--cyan-soft); color: var(--cyan); font: 400 19px "IBM Plex Mono", monospace; }
.summary-card h2 { max-width: 330px; margin: 0; font-size: 18px; font-weight: 500; line-height: 1.42; }
.summary-card > p { margin: 10px 0 0; color: var(--muted); font-size: 10px; line-height: 1.5; }

.runs-card { padding: 18px; }
.runs-head { display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.runs-head label { color: var(--muted); font: 500 7px "IBM Plex Mono", monospace; letter-spacing: 0.08em; }
#timezoneSelect { width: 100%; height: 39px; margin-top: 14px; padding: 0 10px; border: 1px solid var(--line); outline: 0; background: var(--field); color: var(--muted-strong); font: 500 8px "IBM Plex Mono", monospace; letter-spacing: 0.06em; }
#timezoneSelect:focus { border-color: var(--cyan); }
.run-list { margin: 14px 0 0; padding: 0; list-style: none; counter-reset: runs; }
.run-list li { min-height: 57px; display: grid; grid-template-columns: 28px 1fr; align-items: center; gap: 10px; border-top: 1px solid var(--line); counter-increment: runs; }
.run-list li::before { content: "0" counter(runs); color: var(--cyan); font: 500 8px "IBM Plex Mono", monospace; }
.run-list time { display: block; color: var(--muted-strong); font: 500 10px/1.4 "IBM Plex Mono", monospace; }
.run-list small { display: block; margin-top: 3px; color: var(--muted); font: 400 7px "IBM Plex Mono", monospace; letter-spacing: 0.04em; }
.run-list .empty-run { grid-template-columns: 1fr; padding: 17px 0; color: var(--red); font: 400 9px/1.5 "IBM Plex Mono", monospace; }
.run-list .empty-run::before { content: none; }
.timezone-note { margin: 10px 0 0; color: var(--muted); font: 400 8px/1.5 "IBM Plex Mono", monospace; }

.syntax-card { padding: 18px; }
.syntax-card dl { margin: 14px 0 11px; }
.syntax-card dl > div { min-height: 36px; display: flex; align-items: center; justify-content: space-between; gap: 16px; border-bottom: 1px solid var(--line); }
.syntax-card dt, .syntax-card dd { margin: 0; }
.syntax-card code { color: var(--cyan); font: 500 9px "IBM Plex Mono", monospace; }
.syntax-card dd { color: var(--muted); font: 500 7px "IBM Plex Mono", monospace; letter-spacing: 0.06em; text-align: right; }
.syntax-card p { margin: 10px 0 0; color: var(--muted); font-size: 9px; line-height: 1.55; }

footer { min-height: 100px; display: flex; align-items: center; justify-content: space-between; gap: 24px; color: var(--muted); font: 400 8px "IBM Plex Mono", monospace; letter-spacing: 0.08em; }
.toast { position: fixed; left: 50%; bottom: 24px; z-index: 10; padding: 10px 14px; transform: translate(-50%, 12px); opacity: 0; pointer-events: none; background: var(--text); color: var(--bg); font: 500 9px "IBM Plex Mono", monospace; transition: 0.18s; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

button:focus-visible, input:focus-visible, select:focus-visible, a:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }

@media (max-width: 960px) {
  .workspace { grid-template-columns: 1fr; }
  .preview-column { display: grid; grid-template-columns: 1fr 1fr; align-items: stretch; }
  .syntax-card { grid-column: 1 / -1; }
  .position-strip { overflow-x: auto; grid-template-columns: repeat(5, minmax(140px, 1fr)); }
}

@media (max-width: 700px) {
  .app { width: min(100% - 28px, 1220px); }
  .topbar { height: 70px; }
  .local-status { display: none; }
  .intro { min-height: auto; display: block; padding: 34px 0 27px; }
  .intro > p { width: 100%; margin-top: 18px; }
  .expression-entry { grid-template-columns: auto minmax(0, 1fr); gap: 10px; }
  .primary-button { grid-column: 1 / -1; width: 100%; }
  .expression-footer { align-items: flex-start; flex-direction: column; gap: 7px; padding: 12px 17px; }
  .field-row { grid-template-columns: 102px minmax(0, 1fr); }
  .quick-values { grid-column: 1 / -1; max-width: none; justify-content: flex-start; padding-left: 117px; }
  .field-error { grid-column: 1 / -1; margin: -5px 0 0 117px; }
  .preset-grid { grid-template-columns: 1fr 1fr; }
  .preset-grid button, .preset-grid button:nth-child(n), .preset-grid button:nth-child(3n) { border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  .preset-grid button:nth-child(2n) { border-right: 0; }
  .preset-grid button:nth-last-child(-n+2) { border-bottom: 0; }
  .preview-column { display: flex; }
  footer { min-height: 116px; align-items: flex-start; flex-direction: column; justify-content: center; gap: 9px; }
}

@media (max-width: 430px) {
  .panel-note { display: none; }
  .field-row { grid-template-columns: 1fr; gap: 9px; }
  .field-title { grid-column: 1; }
  .quick-values { grid-column: 1; padding-left: 0; }
  .field-error { grid-column: 1; margin-left: 0; }
  .preset-grid { grid-template-columns: 1fr; }
  .preset-grid button, .preset-grid button:nth-child(n) { border-right: 0; border-bottom: 1px solid var(--line); }
  .preset-grid button:last-child { border-bottom: 0; }
  .text-actions { gap: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}