@font-face {
  font-family: 'Zpix';
  src: url('../vendor/zpix.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --ink: #1a237e;
  --ink-soft: #2c34a0;
  --orange: #ff9800;
  --orange-dark: #e08600;
  --green: #4caf50;
  --red: #f44336;
  --gray: #9e9e9e;
  --paper: #ffffff;
  --bg: #f2efe3;
  --bg-grid: rgba(26, 35, 126, .07);
  --shadow: 4px 4px 0 var(--ink);
  --shadow-sm: 3px 3px 0 var(--ink);
  --pixel: 'Zpix', 'Microsoft YaHei', system-ui, sans-serif;
  --sans: 'Noto Sans SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: #1c1c2b;
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: none;
  -moz-osx-font-smoothing: auto;
}

body {
  background-image:
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 16px 16px;
  min-height: 100vh;
}

#pixel-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.wrap { position: relative; z-index: 1; max-width: 1400px; margin: 0 auto; padding: 0 16px 60px; }

/* ---------- 通用像素组件 ---------- */
.pixel-border {
  border: 3px solid var(--ink);
  box-shadow: var(--shadow);
  background: var(--paper);
}

.pixel-btn {
  font-family: var(--pixel);
  font-size: 11px;
  background: var(--orange);
  color: #fff;
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-sm);
  padding: 10px 14px;
  cursor: pointer;
  text-transform: uppercase;
  transition: none;
  text-shadow: 1px 1px 0 var(--ink);
  line-height: 1.4;
}
.pixel-btn:hover { background: var(--orange-dark); }
.pixel-btn:active { transform: translate(3px, 3px); box-shadow: 0 0 0 var(--ink); }
.pixel-btn.green { background: var(--green); }
.pixel-btn.green:hover { background: #43a047; }
.pixel-btn.blue { background: var(--ink-soft); }
.pixel-btn.blue:hover { background: var(--ink); }
.pixel-btn.red { background: var(--red); }
.pixel-btn.red:hover { background: #d32f2f; }
.pixel-btn.ghost { background: #fff; color: var(--ink); text-shadow: none; }
.pixel-btn.ghost:hover { background: #eee; }
.pixel-btn.small { font-size: 9px; padding: 7px 9px; }
.pixel-btn.wide { width: 100%; }

.pixel-input, .pixel-select, .pixel-area {
  width: 100%;
  border: 3px solid var(--ink);
  box-shadow: inset 2px 2px 0 rgba(0, 0, 0, .12);
  padding: 10px 12px;
  font-family: var(--pixel);
  font-size: 12px;
  background: #fff;
  color: var(--ink);
  outline: none;
  line-height: 1.6;
}
.pixel-area { font-family: 'Consolas', 'Courier New', monospace; font-size: 14px; resize: vertical; min-height: 110px; }
.pixel-input:focus, .pixel-select:focus, .pixel-area:focus { box-shadow: inset 2px 2px 0 rgba(0, 0, 0, .12), 0 0 0 3px rgba(255, 152, 0, .35); }
.pixel-select { cursor: pointer; font-size: 11px; }

label.lbl { display: block; font-family: var(--pixel); font-size: 10px; color: var(--ink); margin: 12px 0 6px; }

/* ---------- 顶栏 ---------- */
.topbar {
  background: var(--ink);
  border: 3px solid var(--ink);
  box-shadow: var(--shadow);
  color: #fff;
  padding: 14px 20px;
  margin: 18px 0 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}
.topbar h1 { font-family: var(--pixel); font-size: 16px; margin: 0; text-shadow: 2px 2px 0 #000; }
.topbar .sub { font-size: 12px; opacity: .8; margin-top: 6px; }
.topbar .tag { font-family: var(--pixel); font-size: 9px; background: var(--orange); padding: 6px 8px; border: 2px solid #fff; }

/* ---------- 布局 ---------- */
.layout { display: grid; grid-template-columns: 190px minmax(0, 1fr) 260px; gap: 20px; align-items: start; }
@media (max-width: 1100px) { .layout { grid-template-columns: 170px minmax(0, 1fr); } .side-history { grid-column: 1 / -1; } }
@media (max-width: 760px) { .layout { grid-template-columns: 1fr; } }

.nav { display: flex; flex-direction: column; gap: 8px; padding: 12px; position: sticky; top: 12px; }
.nav button {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
  text-align: left;
  background: #fff;
  border: 3px solid var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
  padding: 9px 10px;
  cursor: pointer;
  color: var(--ink);
  display: flex;
  gap: 8px;
  align-items: center;
}
.nav button:hover { background: #fff6e5; }
.nav button:active { transform: translate(3px, 3px); box-shadow: 0 0 0 var(--ink); }
.nav button.active { background: var(--orange); color: #fff; }
@media (max-width: 760px) {
  .nav { flex-direction: row; flex-wrap: wrap; position: static; }
  .nav button { flex: 1 1 30%; justify-content: center; }
}

.panel { padding: 20px; }
.panel h2 { font-family: var(--pixel); font-size: 13px; color: var(--ink); margin: 0 0 4px; }
.panel .desc { font-size: 12px; color: #666; margin-bottom: 14px; }

.result-box {
  background: var(--green);
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-sm);
  color: #fff;
  padding: 14px 16px;
  margin-top: 16px;
}
.result-box.err { background: var(--red); }
.result-box.info { background: var(--ink-soft); }
.result-box .big { font-family: var(--pixel); font-size: 18px; word-break: break-all; line-height: 1.6; }
.result-box .small { font-size: 12px; margin-top: 8px; opacity: .95; }
.result-box .row { display: flex; justify-content: space-between; gap: 10px; border-bottom: 1px dashed rgba(255, 255, 255, .35); padding: 3px 0; font-size: 12px; }
.result-box .row:last-child { border-bottom: none; }
.result-box .row b { font-family: var(--pixel); font-size: 11px; }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
@media (max-width: 700px) { .grid2, .grid3 { grid-template-columns: 1fr; } }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

.hint { font-size: 12px; color: #666; margin-top: 10px; }
.hint code { background: #eee; padding: 1px 5px; border: 1px solid #ccc; font-family: Consolas, monospace; }

/* ---------- 历史 ---------- */
.side-history { padding: 14px; position: sticky; top: 12px; }
.side-history h3 { font-family: var(--pixel); font-size: 10px; margin: 0 0 10px; color: var(--ink); }
.hist-item {
  border: 2px solid var(--ink);
  background: #fff;
  padding: 8px;
  margin-bottom: 8px;
  cursor: pointer;
  font-size: 12px;
  word-break: break-all;
}
.hist-item:hover { background: #fff6e5; }
.hist-item .ex { font-family: Consolas, monospace; color: var(--ink); }
.hist-item .rs { color: var(--green); font-weight: 700; margin-top: 3px; }
.hist-item .md { font-size: 10px; color: #999; }

/* ---------- 键盘 ---------- */
.keypad { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; margin-top: 12px; }
.keypad button {
  font-family: var(--pixel);
  font-size: 11px;
  background: #fff;
  border: 2px solid var(--ink);
  box-shadow: 2px 2px 0 var(--ink);
  padding: 9px 4px;
  cursor: pointer;
  color: var(--ink);
}
.keypad button:hover { background: #fff6e5; }
.keypad button:active { transform: translate(2px, 2px); box-shadow: 0 0 0 var(--ink); }
.keypad button.fn { background: #e8ecff; }

/* ---------- 表格 ---------- */
.tbl { width: 100%; border-collapse: collapse; margin-top: 10px; font-size: 13px; }
.tbl th, .tbl td { border: 2px solid var(--ink); padding: 6px 8px; text-align: left; }
.tbl th { background: var(--ink); color: #fff; font-family: var(--pixel); font-size: 9px; }

/* ---------- canvas ---------- */
canvas.plot {
  width: 100%;
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-sm);
  background: #fff;
  image-rendering: pixelated;
  margin-top: 12px;
  cursor: crosshair;
  touch-action: none;
}

.foot { text-align: center; font-size: 11px; color: #888; margin-top: 30px; font-family: var(--pixel); }