:root {
  color-scheme: light;
  --page: #e9ede8;
  --paper: #fff;
  --ink: #1c2922;
  --muted: #4c6054;
  --line: #b8c7ba;
  --green: #17674b;
  --green-soft: #e1efe4;
  --blue: #285a8e;
  --blue-soft: #e9f1f8;
  --orange: #a74c22;
  --orange-soft: #fff1e5;
  --red: #a7352c;
}
* { box-sizing: border-box; }
html { font-size: 18px; }
body { margin: 0; background: var(--page); color: var(--ink); font-family: Arial, Helvetica, sans-serif; line-height: 1.45; }
button, input, select, textarea { font: inherit; }
button, select { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .48; }
:focus-visible { outline: 4px solid #d16c28; outline-offset: 3px; }
.app { max-width: 1240px; margin: 0 auto; padding: 32px 24px; }
.visualizer { background: var(--paper); border: 2px solid #9caf9e; border-radius: 12px; overflow: hidden; }
h1, h2 { font-size: 1rem; margin: 0 0 14px; }

.tabs { display: flex; gap: 8px; padding: 8px 28px 0; border-bottom: 2px solid var(--line); }
.tab { min-height: 49px; padding: 9px 16px; border: 0; border-bottom: 4px solid transparent; background: transparent; color: var(--muted); font-weight: 800; font-size: .88rem; }
.tab.active { border-color: var(--green); color: var(--green); }
.tab:hover:not(.active) { background: #edf3ee; color: var(--ink); }

.settings { padding: 17px 28px 12px; border-bottom: 1px solid var(--line); }
.settings-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.settings-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.setting-group { min-width: 0; }
.setting-group > .settings-grid + .settings-grid { margin-top: 9px; }
.nested-settings { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.nested-settings .setting-group + .setting-group { padding-left: 24px; border-left: 1px solid #d5ded5; }
.group-title { font-size: .78rem; font-weight: 800; margin: 0 0 8px; }
.group-title.outer { color: var(--blue); }
.group-title.inner { color: var(--orange); }
.field { min-width: 0; }
.field.wide { grid-column: 1 / -1; }
.field label { display: block; margin-bottom: 5px; color: var(--muted); font-size: .73rem; font-weight: 800; }
.field input, .field select, .field textarea { width: 100%; min-height: 38px; border: 2px solid #9cad9e; border-radius: 5px; background: #fff; color: var(--ink); padding: 5px 9px; font-size: .88rem; }
.field select, .speed-control select { appearance: none; -webkit-appearance: none; padding-right: 40px; background-color: #fff; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none'%3E%3Cpath d='m4 6 4 4 4-4' stroke='%2317674b' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; background-size: 15px; font-weight: 700; }
.field select:hover, .speed-control select:hover { border-color: var(--green); }
.field select:focus-visible, .speed-control select:focus-visible { border-color: var(--green); box-shadow: 0 0 0 2px var(--green-soft); }
.field select option { background: #fff; color: var(--ink); }
.field textarea { min-height: 54px; resize: vertical; }
.field [aria-invalid=true] { border-color: var(--red); background: #fff8f7; }
.error { margin: 2px 0 0; color: #922920; font-size: .7rem; font-weight: 800; }
.error:empty { display: none; }

@supports (appearance: base-select) and selector(::picker(select)) {
  .field select, .speed-control select, ::picker(select) { appearance: base-select; }
  .field select, .speed-control select { background-image: none; }
  .field select:open, .speed-control select:open { border-color: var(--green); background-color: var(--green-soft); }
  .field select::picker-icon, .speed-control select::picker-icon { color: var(--green); transition: rotate .15s ease; }
  .field select:open::picker-icon, .speed-control select:open::picker-icon { rotate: 180deg; }
  ::picker(select) { min-width: anchor-size(width); padding: 5px; border: 2px solid var(--line); border-radius: 8px; background: #fff; color: var(--ink); box-shadow: 0 8px 20px rgb(28 41 34 / 16%); }
  .field select option, .speed-control select option { min-height: 40px; padding: 9px 12px; border-radius: 5px; background: #fff; color: var(--ink); }
  .field select option:hover, .speed-control select option:hover { background: var(--green-soft); color: var(--green); }
  .field select option:checked, .speed-control select option:checked { background: var(--green); color: #fff; font-weight: 800; }
  .field select option::checkmark, .speed-control select option::checkmark { color: #fff; }
}

.controls { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; padding: 15px 28px; border-bottom: 1px solid var(--line); background: #f8faf8; }
.control-buttons, .control-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.control-meta { gap: 18px; }
.button { min-height: 45px; padding: 8px 12px; border: 2px solid var(--ink); border-radius: 5px; background: #fff; color: var(--ink); font-size: .8rem; font-weight: 800; }
.button:hover:not(:disabled) { background: #e8f0e9; }
.button.primary { padding-left: 18px; padding-right: 18px; background: var(--green); border-color: var(--green); color: #fff; }
.button.primary:hover:not(:disabled) { background: #11553d; }
.status { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: .79rem; font-weight: 800; white-space: nowrap; }
.status-dot { width: 11px; height: 11px; border-radius: 50%; background: var(--muted); }
.status[data-state=playing] .status-dot { background: var(--green); }
.status[data-state=paused] .status-dot { background: var(--orange); }
.status[data-state=finished] .status-dot { background: var(--blue); }
.status[data-state=limited] .status-dot, .status[data-state=invalid] .status-dot { background: var(--red); }
.speed-control { display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: .75rem; font-weight: 800; }
.speed-control select { min-height: 38px; border: 2px solid var(--line); border-radius: 5px; color: var(--ink); padding: 5px 36px 5px 10px; font-size: .82rem; }

.stage { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr) minmax(0, .85fr); min-height: 390px; }
.code-side, .result-side, .print-side { min-width: 0; padding: 24px 22px; }
.code-side, .result-side { border-right: 1px solid var(--line); }
.code-wrap { min-height: 170px; border-radius: 6px; background: #202c27; color: #f6fbf6; overflow: auto; padding: 15px 0; }
.code-line { display: grid; grid-template-columns: 30px minmax(max-content, 1fr); gap: 13px; padding: 5px 15px; border-left: 5px solid transparent; font: 1.08rem/1.5 ui-monospace, SFMono-Regular, Consolas, monospace; white-space: pre; }
.code-line.active { background: #365341; border-left-color: #c6ecae; }
.line-number { color: #adc5b1; text-align: right; user-select: none; }
.active-values { display: flex; gap: 14px; min-height: 220px; }
.active-slot { display: flex; flex: 1; flex-direction: column; align-items: center; justify-content: center; min-width: 0; min-height: 220px; padding: 18px; border: 2px solid #9cbea5; border-radius: 8px; background: var(--green-soft); color: var(--green); text-align: center; }
.active-slot.outer { border-color: #9ab8d2; background: var(--blue-soft); color: var(--blue); }
.active-slot.inner { border-color: #e4b692; background: var(--orange-soft); color: var(--orange); }
.active-slot.empty { color: #5c6e61; }
.active-name { font-size: .85rem; font-weight: 800; }
.active-number { max-width: 100%; font: 800 clamp(3.6rem, 7vw, 6rem)/1.1 ui-monospace, SFMono-Regular, Consolas, monospace; overflow-wrap: anywhere; }
.active-values:has(.active-slot:nth-child(2)) .active-slot { padding: 12px; }
.active-values:has(.active-slot:nth-child(2)) .active-number { font-size: clamp(2.3rem, 3vw, 3.5rem); }
.step-description { margin: 15px 0 0; color: var(--muted); font-size: .88rem; font-weight: 700; overflow-wrap: anywhere; }
.print-focus { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; min-height: 220px; min-width: 0; padding: 18px; border: 2px solid var(--line); border-radius: 8px; background: #f3f6f3; text-align: center; }
.print-focus.active { border-color: var(--green); background: var(--green-soft); }
.print-label { color: var(--muted); font-size: .82rem; font-weight: 800; }
.print-focus.active .print-label { color: var(--green); }
.print-value { max-width: 100%; font: 800 clamp(2.7rem, 4vw, 4.5rem)/1.1 ui-monospace, SFMono-Regular, Consolas, monospace; white-space: pre-wrap; overflow-wrap: anywhere; }
.print-focus.active .print-value { color: var(--green); }

@media (max-width: 980px) {
  .stage { grid-template-columns: 1fr; min-height: 0; }
  .code-side, .result-side { border-right: 0; border-bottom: 1px solid var(--line); }
  .code-wrap { min-height: 150px; }
  .nested-settings { grid-template-columns: 1fr; gap: 12px; }
  .nested-settings .setting-group + .setting-group { padding: 12px 0 0; border-left: 0; border-top: 1px solid #d5ded5; }
}
@media (max-width: 600px) {
  html { font-size: 16px; }
  .app { padding: 12px; }
  .visualizer { border-radius: 8px; }
  .status { font-size: .7rem; }
  .tabs { padding: 6px 10px 0; gap: 0; }
  .tab { flex: 1; padding: 8px 3px; font-size: .78rem; }
  .settings, .code-side, .result-side, .print-side, .controls { padding-left: 17px; padding-right: 17px; }
  .settings-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .settings-grid .field:last-child:nth-child(odd) { grid-column: 1 / -1; }
  .control-buttons { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); width: 100%; }
  .control-meta { width: 100%; justify-content: space-between; }
  .button { font-size: .76rem; }
  #play, #step { grid-column: 1 / -1; }
  .active-values:has(.active-slot:nth-child(2)) { flex-direction: column; }
  .active-values:has(.active-slot:nth-child(2)) .active-slot { min-height: 145px; }
  .active-values:has(.active-slot:nth-child(2)) .active-number { font-size: 3.6rem; }
}
@media (prefers-reduced-motion: no-preference) {
  .tab, .button { transition: background-color .15s, border-color .15s, color .15s; }
}