:root {
  --font-sans: "Segoe UI Variable Display", "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  --font-mono: "Cascadia Code", "SFMono-Regular", "Consolas", "Liberation Mono", monospace;
  --radius-xl: 30px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --max-width: 1180px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #080b09;
  --bg-deep: #050806;
  --panel: rgba(16, 22, 18, 0.78);
  --panel-strong: #111814;
  --panel-sheen: rgba(255, 255, 255, 0.045);
  --inset: rgba(255, 255, 255, 0.035);
  --inset-strong: rgba(255, 255, 255, 0.065);
  --line: rgba(231, 255, 235, 0.1);
  --line-strong: rgba(231, 255, 235, 0.22);
  --text: #f0f6ec;
  --text-soft: #c7d3c7;
  --muted: #8d9c90;
  --faint: #7f8d82;
  --accent: #ccf562;
  --accent-text: #d7ff80;
  --accent-soft: rgba(204, 245, 98, 0.13);
  --accent-ink: #151d05;
  --mint: #65e6c4;
  --mint-soft: rgba(101, 230, 196, 0.12);
  --amber: #ffc46b;
  --amber-soft: rgba(255, 196, 107, 0.12);
  --violet: #c5a8ff;
  --violet-soft: rgba(197, 168, 255, 0.12);
  --danger: #ff8585;
  --danger-soft: rgba(255, 133, 133, 0.1);
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.32);
  --grid-line: rgba(255, 255, 255, 0.032);
  --glow-one: rgba(204, 245, 98, 0.1);
  --glow-two: rgba(255, 196, 107, 0.055);
}

[data-theme="light"] {
  color-scheme: light;
  --bg: #f4f1e8;
  --bg-deep: #eae6da;
  --panel: rgba(255, 255, 251, 0.78);
  --panel-strong: #fbfaf4;
  --panel-sheen: rgba(255, 255, 255, 0.62);
  --inset: rgba(20, 30, 22, 0.04);
  --inset-strong: rgba(20, 30, 22, 0.07);
  --line: rgba(23, 35, 25, 0.11);
  --line-strong: rgba(23, 35, 25, 0.22);
  --text: #162019;
  --text-soft: #37453b;
  --muted: #55645a;
  --faint: #637166;
  --accent: #b8e04c;
  --accent-text: #4c6b05;
  --accent-soft: rgba(111, 150, 20, 0.12);
  --accent-ink: #1b2506;
  --mint: #0a7a62;
  --mint-soft: rgba(11, 143, 114, 0.1);
  --amber: #955800;
  --amber-soft: rgba(169, 99, 0, 0.1);
  --violet: #6f49c9;
  --violet-soft: rgba(111, 73, 201, 0.1);
  --danger: #c43f3f;
  --danger-soft: rgba(196, 63, 63, 0.08);
  --shadow: 0 24px 60px rgba(55, 47, 24, 0.1);
  --grid-line: rgba(23, 35, 25, 0.04);
  --glow-one: rgba(130, 172, 31, 0.13);
  --glow-two: rgba(255, 176, 65, 0.08);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(1100px 720px at 12% -12%, var(--glow-one), transparent 62%),
    radial-gradient(900px 620px at 102% 4%, var(--glow-two), transparent 60%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  z-index: 0;
  inset: 0;
  content: "";
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.4) 55%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.4) 55%, transparent 100%);
}

button,
input,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
}

::selection {
  background: var(--accent);
  color: var(--accent-ink);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

[hidden] {
  display: none !important;
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.app {
  position: relative;
  z-index: 1;
  width: min(var(--max-width), calc(100% - 48px));
  margin: 0 auto;
}

/* ---------------------------------------------------------------- topbar */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 88px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 12px;
  background: var(--accent);
  color: var(--accent-ink);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 800;
  box-shadow:
    0 0 0 1px rgba(0, 0, 0, 0.08),
    0 8px 28px var(--accent-soft);
}

.brand-text {
  display: flex;
  flex-direction: column;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.15em;
  line-height: 1.05;
}

.brand-text span {
  margin-top: 5px;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.24em;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.live {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.live > span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2.6s ease-in-out infinite;
}

.icon-btn {
  display: grid;
  width: 40px;
  height: 40px;
  padding: 0;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--inset);
  color: var(--text-soft);
  transition:
    color 0.2s var(--ease),
    background 0.2s var(--ease),
    border-color 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.icon-btn:hover {
  border-color: var(--line-strong);
  background: var(--inset-strong);
  color: var(--accent-text);
  transform: rotate(-8deg);
}

.icon {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.6;
}

[data-theme="dark"] .icon-moon,
[data-theme="light"] .icon-sun {
  display: none;
}

/* ------------------------------------------------------------------ hero */

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(300px, 0.82fr);
  align-items: center;
  gap: 30px;
  min-height: 410px;
  padding: 54px 0 42px;
}

.hero-copy {
  position: relative;
  z-index: 1;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
}

.eyebrow::before {
  display: block;
  width: 28px;
  height: 1px;
  background: var(--accent);
  content: "";
}

.eyebrow span {
  color: var(--accent-text);
}

.eyebrow.small {
  margin-bottom: 6px;
  font-size: 9px;
}

h1 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(52px, 6vw, 76px);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 1.04;
}

h1 .accent {
  color: var(--accent-text);
}

.lede {
  max-width: 500px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.01em;
  line-height: 1.85;
}

.feature-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--inset);
  color: var(--text-soft);
  font-size: 11px;
}

.feature-list li::before {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--mint);
  content: "";
}

/* ------------------------------------------------------------- hero orbit */

.hero-art {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 360px;
}

.hero-art::before {
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: var(--accent-soft);
  filter: blur(80px);
  opacity: 0.6;
  content: "";
}

.orbit {
  position: relative;
  width: min(356px, 100%);
  aspect-ratio: 1;
}

.orbit-ring {
  position: absolute;
  border-radius: 50%;
}

.ring-one {
  inset: 0;
  border: 1px solid var(--line);
}

.ring-two {
  inset: 9%;
  border: 1px dashed var(--line-strong);
}

.ring-three {
  inset: 25%;
  border: 1px solid var(--line);
}

.orbit-sweep {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    from 205deg,
    transparent 0 70%,
    var(--accent-soft) 80%,
    rgba(204, 245, 98, 0.38) 86%,
    transparent 92%
  );
  -webkit-mask: radial-gradient(
    farthest-side,
    transparent calc(100% - 2px),
    #000 calc(100% - 1px)
  );
  mask: radial-gradient(farthest-side, transparent calc(100% - 2px), #000 calc(100% - 1px));
  animation: spin 24s linear infinite;
}

.orbit-token {
  position: absolute;
  z-index: 2;
  display: grid;
  width: 48px;
  height: 32px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel-strong);
  color: var(--text-soft);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.18);
}

.token-2 {
  top: -2%;
  left: 50%;
  transform: translateX(-50%);
}

.token-8 {
  top: 50%;
  right: -1%;
  transform: translateY(-50%);
}

.token-10 {
  bottom: -2%;
  left: 50%;
  transform: translateX(-50%);
}

.token-16 {
  top: 50%;
  left: -1%;
  transform: translateY(-50%);
}

.orbit-core {
  position: absolute;
  top: 50%;
  left: 50%;
  display: flex;
  width: 158px;
  height: 158px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 28%, rgba(255, 255, 255, 0.08), transparent 55%),
    var(--panel-strong);
  box-shadow:
    inset 0 0 0 8px var(--inset),
    0 24px 60px rgba(0, 0, 0, 0.28);
  transform: translate(-50%, -50%);
}

.core-kicker {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.24em;
}

.orbit-core strong {
  margin: 3px 0 2px;
  color: var(--accent-text);
  font-family: var(--font-mono);
  font-size: 29px;
  font-weight: 500;
  letter-spacing: -0.055em;
  line-height: 1.05;
}

.core-sub {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 6.5px;
  letter-spacing: 0.19em;
}

/* ------------------------------------------------------------- workspace */

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.03fr) minmax(0, 0.97fr);
  gap: 18px;
}

.panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(155deg, var(--panel-sheen), transparent 46%),
    var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.panel::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
  content: "";
  opacity: 0.75;
}

.input-panel,
.output-panel {
  display: flex;
  min-width: 0;
  flex-direction: column;
  padding: 24px;
}

.panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.panel-title {
  display: flex;
  min-width: 0;
  align-items: flex-start;
  gap: 11px;
}

.step {
  display: grid;
  width: 28px;
  height: 28px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid rgba(204, 245, 98, 0.16);
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-text);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.04em;
}

.panel-title h2 {
  margin: 1px 0 0;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.panel-title p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.4;
  white-space: nowrap;
}

.ghost-btn {
  flex: 0 0 auto;
  padding: 6px 2px;
  border: 0;
  background: transparent;
  color: var(--faint);
  font-size: 11px;
  transition: color 0.2s var(--ease);
}

.ghost-btn:hover {
  color: var(--text);
}

/* ------------------------------------------------------------ input area */

.field-shell {
  display: flex;
  min-height: 86px;
  align-items: center;
  gap: 13px;
  margin-top: 22px;
  padding: 0 17px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--inset);
  transition:
    border-color 0.2s var(--ease),
    background 0.2s var(--ease),
    box-shadow 0.2s var(--ease);
}

.field-shell:focus-within {
  border-color: var(--accent);
  background: var(--inset-strong);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.field-shell.is-error {
  border-color: var(--danger);
  box-shadow: 0 0 0 4px var(--danger-soft);
}

.base-tag {
  flex: 0 0 auto;
  padding: 6px 8px;
  border: 1px solid rgba(204, 245, 98, 0.16);
  border-radius: 7px;
  background: var(--accent-soft);
  color: var(--accent-text);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

#valueInput {
  width: 100%;
  min-width: 0;
  padding: 20px 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: clamp(24px, 2.6vw, 30px);
  font-weight: 500;
  letter-spacing: 0.01em;
}

#valueInput:focus-visible {
  outline: 0;
}

#valueInput::placeholder {
  color: var(--faint);
  opacity: 0.65;
}

.field-hint,
.field-error {
  min-height: 17px;
  margin: 8px 2px 0;
  font-size: 11px;
  line-height: 1.55;
}

.field-hint {
  color: var(--faint);
}

.field-error {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  color: var(--danger);
}

.field-error::before {
  display: grid;
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
  margin-top: 1px;
  place-items: center;
  border-radius: 50%;
  background: var(--danger-soft);
  content: "!";
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 700;
}

.base-control {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  margin-top: 18px;
}

.control-label {
  margin-right: 2px;
  color: var(--muted);
  font-size: 11px;
  white-space: nowrap;
}

.base-chips {
  display: flex;
  gap: 3px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--inset);
}

.base-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  padding: 7px 8px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  transition:
    color 0.18s var(--ease),
    background 0.18s var(--ease),
    transform 0.18s var(--ease);
}

.base-chip span {
  color: var(--faint);
  font-family: var(--font-sans);
  font-size: 8px;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.base-chip:hover {
  background: var(--inset-strong);
  color: var(--text);
}

.base-chip.active {
  background: var(--accent);
  color: var(--accent-ink);
  box-shadow: 0 4px 14px var(--accent-soft);
}

.base-chip.active span {
  color: rgba(21, 29, 5, 0.58);
}

.select-shell {
  position: relative;
  display: inline-flex;
  height: 38px;
  align-items: center;
  gap: 6px;
  padding: 0 28px 0 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--inset);
  transition:
    border-color 0.2s var(--ease),
    background 0.2s var(--ease);
}

.select-shell:hover,
.select-shell:focus-within {
  border-color: var(--line-strong);
  background: var(--inset-strong);
}

.select-shell:focus-within {
  border-color: var(--accent);
}

.select-label {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.select-shell select {
  max-width: 76px;
  padding: 0;
  border: 0;
  outline: 0;
  appearance: none;
  background: transparent;
  color: var(--text-soft);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.03em;
}

.select-shell select:focus-visible {
  outline: 0;
}

.select-chevron {
  position: absolute;
  right: 8px;
  width: 12px;
  height: 12px;
  fill: none;
  stroke: var(--muted);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
  pointer-events: none;
}

.select-shell.source-select.is-custom {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.select-shell.source-select.is-custom .select-label {
  color: var(--accent-text);
}

/* ---------------------------------------------------------------- samples */

.examples {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  margin-top: auto;
  padding-top: 20px;
}

.examples-label {
  margin-right: 2px;
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.example-chip {
  padding: 6px 9px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10.5px;
  transition:
    color 0.18s var(--ease),
    border-color 0.18s var(--ease),
    background 0.18s var(--ease);
}

.example-chip:hover {
  border-color: var(--line-strong);
  background: var(--inset);
  color: var(--text);
}

.example-chip sub {
  margin-left: 2px;
  color: var(--faint);
  font-size: 7px;
}

/* ----------------------------------------------------------- result area */

.output-panel {
  min-height: 100%;
}

.target-select {
  height: 40px;
}

.target-select select {
  max-width: 84px;
}

.result-stage {
  display: flex;
  min-height: 224px;
  flex: 1;
  flex-direction: column;
  margin-top: 22px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background:
    radial-gradient(420px 150px at 100% 0%, var(--accent-soft), transparent 70%),
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
    var(--inset);
  background-size: auto, 22px 22px, 22px 22px, auto;
  background-position: 0 0, -1px -1px, -1px -1px, 0 0;
}

.result-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.result-label {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.13em;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 8px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.06em;
}

.badge::before {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
  content: "";
}

.badge.exact {
  background: var(--mint-soft);
  color: var(--mint);
}

.badge.approx {
  background: var(--amber-soft);
  color: var(--amber);
}

.badge.neutral {
  background: var(--inset-strong);
  color: var(--faint);
}

.result-value-wrap {
  display: flex;
  min-height: 0;
  flex: 1;
  align-items: center;
  gap: 14px;
  padding: 10px 0 8px;
}

.result-value {
  width: 100%;
  max-height: 158px;
  margin: 0;
  overflow: auto;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: clamp(31px, 3.8vw, 47px);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.14;
  overflow-wrap: anywhere;
  scrollbar-width: thin;
}

.approx-mark {
  margin-right: 0.1em;
  color: var(--amber);
  font-size: 0.5em;
  vertical-align: 0.35em;
}

.result-stage.is-empty .result-value {
  color: var(--faint);
}

.copy-btn {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel-strong);
  color: var(--muted);
  transition:
    color 0.2s var(--ease),
    background 0.2s var(--ease),
    border-color 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.copy-btn svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.6;
}

.copy-btn:hover {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
  transform: translateY(-1px);
}

.copy-btn:active {
  transform: translateY(0);
}

.copy-btn:disabled {
  opacity: 0.38;
}

.copy-btn:disabled:hover {
  border-color: var(--line);
  background: var(--panel-strong);
  color: var(--muted);
  transform: none;
}

.copy-btn.is-copied {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
}

.result-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 10px;
  flex-wrap: wrap;
}

#resultMeta {
  margin: 0;
  color: var(--faint);
  font-size: 10px;
  line-height: 1.55;
}

.precision-control {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--faint);
  font-size: 10px;
  white-space: nowrap;
}

.precision-control select {
  height: 25px;
  padding: 0 4px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--inset);
  color: var(--text-soft);
  font-family: var(--font-mono);
  font-size: 9px;
}

.display-options {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-top: 16px;
  padding-top: 15px;
  border-top: 1px solid var(--line);
}

.switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  cursor: pointer;
  font-size: 10.5px;
  user-select: none;
}

.switch input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.switch-track {
  position: relative;
  width: 28px;
  height: 16px;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--inset-strong);
  transition:
    border-color 0.2s var(--ease),
    background 0.2s var(--ease);
}

.switch-track::after {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--muted);
  content: "";
  transition:
    background 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.switch input:checked + .switch-track {
  border-color: var(--accent);
  background: var(--accent);
}

.switch input:checked + .switch-track::after {
  background: var(--accent-ink);
  transform: translateX(12px);
}

.switch input:focus-visible + .switch-track {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ----------------------------------------------------------- common bases */

.common-section {
  margin-top: 48px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 16px;
}

.section-head h2 {
  margin: 0;
  font-size: 23px;
  font-weight: 600;
  letter-spacing: -0.035em;
}

.section-hint {
  margin: 0 0 3px;
  color: var(--faint);
  font-size: 10.5px;
}

.base-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.base-card {
  position: relative;
  display: flex;
  min-height: 158px;
  min-width: 0;
  flex-direction: column;
  padding: 17px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 21px;
  background:
    linear-gradient(155deg, var(--panel-sheen), transparent 55%),
    var(--panel);
  color: var(--text);
  text-align: left;
  transition:
    transform 0.25s var(--ease),
    border-color 0.25s var(--ease),
    background 0.25s var(--ease);
}

.base-card::before {
  position: absolute;
  top: -62px;
  right: -48px;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: var(--tone);
  filter: blur(42px);
  content: "";
  opacity: 0.11;
  transition:
    opacity 0.25s var(--ease),
    transform 0.25s var(--ease);
}

.base-card:hover {
  border-color: color-mix(in srgb, var(--tone) 42%, var(--line));
  background:
    linear-gradient(155deg, var(--panel-sheen), transparent 55%),
    var(--panel-strong);
  transform: translateY(-3px);
}

.base-card:hover::before {
  opacity: 0.19;
  transform: scale(1.12);
}

.base-card.is-target {
  border-color: color-mix(in srgb, var(--tone) 36%, var(--line));
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--tone) 14%, transparent);
}

.base-card.is-copied {
  border-color: var(--accent);
}

.tone-mint {
  --tone: var(--mint);
}

.tone-amber {
  --tone: var(--amber);
}

.tone-lime {
  --tone: var(--accent-text);
}

.tone-violet {
  --tone: var(--violet);
}

.card-top,
.card-name,
.card-value,
.card-copy {
  position: relative;
  z-index: 1;
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.card-code {
  color: var(--tone);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.17em;
}

.card-base {
  padding: 2px 5px;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.05em;
}

.base-card.is-target .card-base {
  border-color: color-mix(in srgb, var(--tone) 40%, var(--line));
  color: var(--tone);
}

.card-name {
  margin-top: 6px;
  color: var(--muted);
  font-size: 11px;
}

.card-value {
  margin-top: auto;
  padding-top: 16px;
  padding-right: 27px;
  overflow: hidden;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: clamp(18px, 2vw, 25px);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.25;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.card-copy {
  position: absolute;
  right: 13px;
  bottom: 13px;
  display: grid;
  width: 21px;
  height: 21px;
  place-items: center;
  border-radius: 6px;
  background: var(--inset-strong);
  color: var(--faint);
  opacity: 0;
  transform: translateY(2px);
  transition:
    opacity 0.2s var(--ease),
    transform 0.2s var(--ease),
    color 0.2s var(--ease);
}

.card-copy svg {
  width: 12px;
  height: 12px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.base-card:hover .card-copy,
.base-card:focus-visible .card-copy {
  opacity: 1;
  transform: translateY(0);
}

.base-card.is-copied .card-copy {
  background: var(--accent);
  color: var(--accent-ink);
  opacity: 1;
  transform: none;
}

/* -------------------------------------------------------------- all bases */

.all-bases {
  margin-top: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background:
    linear-gradient(155deg, var(--panel-sheen), transparent 55%),
    var(--panel);
  box-shadow: 0 16px 50px rgba(0, 0, 0, 0.12);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.all-bases summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 17px 20px;
  list-style: none;
  cursor: pointer;
  user-select: none;
}

.all-bases summary::-webkit-details-marker {
  display: none;
}

.summary-title {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: 13px;
  font-weight: 600;
}

.plus-icon {
  position: relative;
  display: grid;
  width: 24px;
  height: 24px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  transition:
    border-color 0.25s var(--ease),
    transform 0.25s var(--ease);
}

.plus-icon::before,
.plus-icon::after {
  position: absolute;
  width: 9px;
  height: 1px;
  background: var(--muted);
  content: "";
  transition: background 0.25s var(--ease);
}

.plus-icon::after {
  transform: rotate(90deg);
}

.all-bases[open] .plus-icon {
  border-color: var(--accent);
  transform: rotate(45deg);
}

.all-bases[open] .plus-icon::before,
.all-bases[open] .plus-icon::after {
  background: var(--accent-text);
}

.summary-meta {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.07em;
}

.all-grid {
  display: grid;
  max-height: 430px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 7px;
  padding: 0 15px 15px;
  overflow-y: auto;
  scrollbar-width: thin;
}

.all-base {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 9px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--inset);
  color: var(--text);
  text-align: left;
  transition:
    border-color 0.18s var(--ease),
    background 0.18s var(--ease);
}

.all-base:hover {
  border-color: var(--line-strong);
  background: var(--inset-strong);
}

.all-base.is-target {
  border-color: color-mix(in srgb, var(--accent) 40%, var(--line));
  background: var(--accent-soft);
}

.all-base.is-copied {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.all-base-base {
  width: 20px;
  flex: 0 0 auto;
  color: var(--accent-text);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.02em;
}

.all-base-value {
  min-width: 0;
  overflow: hidden;
  flex: 1;
  color: var(--text-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* --------------------------------------------------------------- footer */

.footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 36px;
  padding: 28px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
}

/* ---------------------------------------------------------------- toast */

.toast {
  position: fixed;
  z-index: 50;
  bottom: 26px;
  left: 50%;
  display: inline-flex;
  max-width: calc(100vw - 32px);
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--text);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  color: var(--bg);
  font-size: 11.5px;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 14px);
  transition:
    opacity 0.22s var(--ease),
    transform 0.22s var(--ease),
    visibility 0.22s;
  visibility: hidden;
  white-space: nowrap;
}

.toast::before {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

.toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
  visibility: visible;
}

/* ------------------------------------------------------------- scrollbar */

.result-value::-webkit-scrollbar,
.all-grid::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.result-value::-webkit-scrollbar-thumb,
.all-grid::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: var(--line-strong);
}

/* ------------------------------------------------------------- animation */

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse {
  0%,
  100% {
    box-shadow: 0 0 0 4px var(--accent-soft);
    opacity: 1;
  }
  50% {
    box-shadow: 0 0 0 7px transparent;
    opacity: 0.65;
  }
}

/* ------------------------------------------------------------ responsive */

@media (max-width: 1050px) {
  .hero {
    grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
    min-height: 380px;
  }

  .hero-art {
    min-height: 320px;
  }

  .orbit {
    width: min(314px, 100%);
  }

  .orbit-core {
    width: 144px;
    height: 144px;
  }

  .panel-title p {
    white-space: normal;
  }

  .result-value {
    font-size: clamp(29px, 3.7vw, 42px);
  }
}

@media (max-width: 920px) {
  .hero {
    grid-template-columns: minmax(0, 1fr) 280px;
  }

  .hero-art {
    min-height: 290px;
  }

  .orbit {
    width: 280px;
  }

  .orbit-core {
    width: 130px;
    height: 130px;
  }

  .orbit-core strong {
    font-size: 25px;
  }

  .workspace {
    grid-template-columns: minmax(0, 1fr);
  }

  .base-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .all-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .app {
    width: min(var(--max-width), calc(100% - 32px));
  }

  .topbar {
    min-height: 74px;
  }

  .hero {
    display: block;
    min-height: auto;
    padding: 38px 0 30px;
  }

  .hero-art {
    display: none;
  }

  h1 {
    font-size: clamp(42px, 8vw, 58px);
  }

  .lede {
    margin-top: 17px;
    font-size: 13px;
    line-height: 1.75;
  }

  .feature-list {
    margin-top: 21px;
  }

  .common-section {
    margin-top: 36px;
  }

  .section-head h2 {
    font-size: 21px;
  }

  .all-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer {
    flex-wrap: wrap;
    padding-bottom: 30px;
  }

  .footer span:last-child {
    display: none;
  }
}

@media (max-width: 620px) {
  .app {
    width: calc(100% - 28px);
  }

  .live {
    display: none;
  }

  .hero {
    padding-top: 32px;
  }

  .eyebrow {
    margin-bottom: 16px;
  }

  .panel {
    border-radius: 23px;
  }

  .input-panel,
  .output-panel {
    padding: 18px;
  }

  .field-shell {
    min-height: 76px;
    gap: 10px;
    margin-top: 18px;
    padding: 0 13px;
    border-radius: 15px;
  }

  #valueInput {
    padding: 17px 0;
    font-size: clamp(21px, 6.1vw, 27px);
  }

  .base-tag {
    padding: 5px 6px;
    font-size: 7px;
  }

  .field-hint,
  .field-error {
    margin-top: 7px;
    font-size: 10px;
  }

  .base-control {
    margin-top: 16px;
  }

  .control-label {
    width: 100%;
    margin-bottom: 1px;
  }

  .base-chips {
    flex: 1;
  }

  .base-chip {
    flex: 1;
    justify-content: center;
  }

  .source-select {
    margin-left: auto;
  }

  .examples {
    padding-top: 16px;
  }

  .panel-title p {
    font-size: 10px;
  }

  .result-stage {
    min-height: 208px;
    margin-top: 18px;
    padding: 15px;
  }

  .result-value {
    font-size: clamp(28px, 8.4vw, 39px);
    letter-spacing: -0.045em;
  }

  .copy-btn {
    width: 38px;
    height: 38px;
  }

  .base-grid {
    gap: 9px;
  }

  .base-card {
    min-height: 144px;
    padding: 15px;
    border-radius: 18px;
  }

  .card-value {
    font-size: clamp(17px, 5vw, 22px);
  }

  .card-copy {
    opacity: 0.58;
    transform: none;
  }

  .all-grid {
    max-height: none;
    padding: 0 12px 12px;
  }

  .all-bases summary {
    padding: 15px 16px;
  }

  .summary-meta {
    font-size: 8px;
  }
}

@media (max-width: 430px) {
  .brand-text {
    font-size: 13px;
  }

  .brand-text span {
    font-size: 8px;
  }

  h1 {
    font-size: clamp(39px, 10.8vw, 48px);
  }

  .feature-list {
    gap: 6px;
  }

  .feature-list li {
    padding: 6px 9px;
    font-size: 10px;
  }

  .source-select {
    flex: 0 0 auto;
  }

  .result-foot {
    align-items: flex-start;
  }

  #resultMeta {
    max-width: 100%;
  }

  .base-card {
    min-height: 136px;
  }

  .footer {
    gap: 7px;
    flex-direction: column;
  }
}

@media (max-width: 350px) {
  .base-grid,
  .all-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .all-grid {
    max-height: 430px;
  }

  .summary-meta {
    display: none;
  }
}

@media (hover: none) {
  .card-copy {
    opacity: 0.55;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }
}