/* ============ 全能计算器 样式 ============ */
:root {
  --bg: #0d1117;
  --bg2: #111827;
  --panel: #161e2e;
  --panel2: #1c2637;
  --line: #263042;
  --txt: #e6edf7;
  --muted: #8b9bb4;
  --acc: #4f8cff;
  --acc2: #7c5cff;
  --ok: #2ec27e;
  --warn: #f5a524;
  --err: #f4506e;
  --num: #1e293b;
  --num-h: #334155;
  --radius: 12px;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, sans-serif;
  background:
    radial-gradient(1000px 500px at 85% -10%, rgba(124,92,255,.14), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(79,140,255,.12), transparent 60%),
    var(--bg);
  color: var(--txt);
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

.app { display: flex; min-height: 100vh; }

/* ---------- 侧栏 ---------- */
.sidebar {
  width: 236px; flex-shrink: 0;
  background: rgba(13, 17, 23, .9);
  border-right: 1px solid var(--line);
  padding: 18px 12px;
  display: flex; flex-direction: column;
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.brand { display: flex; gap: 10px; align-items: center; padding: 4px 8px 16px; }
.brand-mark {
  width: 40px; height: 40px; border-radius: 10px; flex-shrink: 0;
  display: grid; place-items: center; font-size: 22px; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, var(--acc), var(--acc2));
  box-shadow: 0 4px 18px rgba(94, 108, 255, .4);
}
.brand h1 { font-size: 17px; }
.brand p { font-size: 11px; color: var(--muted); }

.nav { display: flex; flex-direction: column; gap: 2px; flex: 1; }
.nav-group { font-size: 11px; color: var(--muted); letter-spacing: .08em; padding: 14px 10px 4px; }
.nav-item {
  display: flex; align-items: center; gap: 9px;
  padding: 8px 10px; border-radius: 8px; cursor: pointer; color: var(--txt);
  border: none; background: none; text-align: left; font-size: 13px; width: 100%;
  transition: background .15s, color .15s;
}
.nav-item:hover { background: rgba(255,255,255,.05); }
.nav-item.active { background: linear-gradient(90deg, rgba(79,140,255,.22), rgba(124,92,255,.14)); color: #fff; }
.nav-item .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--muted); flex-shrink: 0; }
.nav-item.active .dot { background: var(--acc); box-shadow: 0 0 8px var(--acc); }
.side-foot { font-size: 11px; color: var(--muted); padding: 12px 8px 0; border-top: 1px dashed var(--line); margin-top: 10px; }

/* ---------- 主区 ---------- */
.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
  display: flex; align-items: baseline; gap: 14px;
  padding: 18px 26px 12px; border-bottom: 1px solid var(--line);
  background: rgba(13,17,23,.55); backdrop-filter: blur(8px);
  position: sticky; top: 0; z-index: 20;
}
.topbar h2 { font-size: 19px; }
.page-desc { color: var(--muted); font-size: 13px; }
.menu-btn {
  display: none; background: var(--panel); color: var(--txt); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 12px; font-size: 15px; cursor: pointer;
}

.sections { padding: 20px 26px 60px; max-width: 1100px; width: 100%; margin: 0 auto; }
.calc-section { display: none; animation: fadein .25s ease; }
.calc-section.active { display: block; }
@keyframes fadein { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(330px, 1fr)); gap: 16px; }
.card {
  background: linear-gradient(160deg, var(--panel), var(--bg2));
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; min-width: 0;
}
.card h3 { font-size: 14px; margin-bottom: 14px; color: #cfe0ff; font-weight: 600; }
.card.wide { grid-column: 1 / -1; }
.card .cal, .card .btn-row { margin-top: 10px; }

.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.field label { font-size: 12px; color: var(--muted); }
.field input, .field select, .card select, .field textarea {
  background: var(--num); color: var(--txt); border: 1px solid var(--line);
  border-radius: 8px; padding: 9px 12px; font-size: 14px; outline: none; width: 100%;
  transition: border .15s;
}
.field select { cursor: pointer; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--acc); }
.field-inline2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px,1fr)); gap: 10px; }
.chk-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 8px 0; }
.chk { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--txt); cursor: pointer; }
.chk input { accent-color: var(--acc); width: 15px; height: 15px; }

button {
  font-family: inherit; cursor: pointer;
}
.cal {
  background: linear-gradient(135deg, var(--acc), var(--acc2)); color: #fff; border: none;
  padding: 10px 22px; border-radius: 9px; font-size: 14px; font-weight: 600;
  transition: transform .12s, filter .12s;
}
.cal:hover { filter: brightness(1.12); }
.cal:active { transform: scale(.97); }
.ghost {
  background: none; border: 1px solid var(--line); color: var(--txt);
  padding: 8px 16px; border-radius: 8px; font-size: 13px; margin-top: 8px;
}
.ghost:hover { border-color: var(--acc); color: var(--acc); }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; }
.btn-row button { padding: 8px 16px; border-radius: 8px; font-size: 13px; border: 1px solid var(--line); background: var(--panel2); color: var(--txt); }
.btn-row button:first-child { background: linear-gradient(135deg, var(--acc), var(--acc2)); border: none; color: #fff; }

.out {
  margin-top: 14px; padding: 12px 14px; border-radius: 10px;
  background: rgba(79,140,255,.07); border: 1px solid rgba(79,140,255,.2);
  font-size: 14px; line-height: 1.7; min-height: 42px; white-space: pre-wrap; word-break: break-all;
}
.out:empty { display: none; }
.out .big { font-size: 22px; font-weight: 700; color: #fff; }
.out.mono, .mono { font-family: var(--mono); }
.out .lbl { color: var(--muted); }
.big-result {
  font-family: var(--mono); font-size: 30px; font-weight: 700; color: #7ee0a8;
  background: rgba(46,194,126,.07); border: 1px solid rgba(46,194,126,.2);
  padding: 14px 16px; border-radius: 10px; word-break: break-all; min-height: 60px;
}
.kv { display: flex; flex-direction: column; gap: 8px; }
.kv div { display: flex; justify-content: space-between; align-items: center; padding: 8px 10px; background: var(--num); border-radius: 8px; }
.kv span { color: var(--muted); font-size: 12px; }
.kv b { font-family: var(--mono); word-break: break-all; text-align: right; padding-left: 10px; }

.err { color: var(--err); font-size: 13px; margin-top: 8px; min-height: 18px; }
.hint { color: var(--muted); font-size: 12px; margin-top: 12px; line-height: 1.7; }
.hint code { background: rgba(255,255,255,.08); padding: 1px 5px; border-radius: 4px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.chip {
  background: var(--num); border: 1px solid var(--line); color: var(--txt);
  padding: 5px 12px; border-radius: 999px; font-size: 12px;
}
.chip:hover { border-color: var(--acc); color: var(--acc); }

/* ---------- 模式标签 ---------- */
.mode-tabs { display: flex; gap: 6px; margin-bottom: 12px; background: var(--num); padding: 4px; border-radius: 10px; width: fit-content; }
.mode-tab { background: none; border: none; color: var(--muted); padding: 6px 16px; border-radius: 8px; font-size: 13px; }
.mode-tab.active { background: linear-gradient(135deg, var(--acc), var(--acc2)); color: #fff; }
.mode-tabs.mini { margin: 0 0 12px; }

/* ---------- 计算器键盘 ---------- */
.calc-wrap { background: linear-gradient(160deg, var(--panel), var(--bg2)); border: 1px solid var(--line); border-radius: 16px; padding: 20px; }
.display {
  background: var(--num); border: 1px solid var(--line); border-radius: 12px;
  padding: 12px 16px; text-align: right; margin-bottom: 12px; position: relative;
}
.display-history { font-size: 12px; color: var(--muted); min-height: 16px; word-break: break-all; }
.display-input { font-size: 22px; color: #fff; font-family: var(--mono); word-break: break-all; min-height: 30px; line-height: 30px; }
.display-result { font-size: 15px; color: #7ee0a8; font-family: var(--mono); min-height: 20px; word-break: break-all; }
.mem-ind {
  position: absolute; top: 8px; left: 12px; color: var(--warn); font-weight: 700; font-size: 13px;
  display: none;
}
.mem-ind.on { display: block; }

.sci-top { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.ang-toggle { font-size: 13px; color: var(--muted); display: inline-flex; align-items: center; gap: 8px; }
.ang-toggle select { background: var(--num); color: var(--txt); border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px; font-size: 13px; }

.keypad { display: grid; gap: 8px; }
.keypad.basic, .keypad.num4 { grid-template-columns: repeat(4, 1fr); margin-top: 8px; }
.keypad.fn6 { grid-template-columns: repeat(6, 1fr); }
#kpadSci .keypad + .keypad { margin-top: 8px; }
.k {
  border: none; border-radius: 9px; padding: 13px 4px; font-size: 15px;
  background: var(--num); color: var(--txt); transition: filter .1s, transform .05s;
  user-select: none; min-width: 0; cursor: pointer; font-family: inherit;
}
.k.wide2 { grid-column: span 2; }

@media (max-width: 700px) {
  .keypad.fn6 { grid-template-columns: repeat(4, 1fr); }
}
.k:hover { filter: brightness(1.35); }
.k:active { transform: scale(.95); }
.k.num { background: var(--num); color: #fff; }
.k.op { background: #24406e; color: #a9c7ff; }
.k.fn { background: #232c40; color: #8fd3ff; font-size: 13px; }
.k.act { background: #4a2438; color: #ffb0c2; }
.k.eq { background: linear-gradient(135deg, var(--acc), var(--acc2)); color: #fff; font-size: 20px; }
.k.disabled { opacity: .25; pointer-events: none; }
.adv-hidden { display: none; }

.mem-row { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.m-btn {
  flex: 1; min-width: 56px; background: var(--num); color: var(--muted); border: 1px solid var(--line);
  padding: 6px; border-radius: 8px; font-size: 12px;
}
.m-btn:hover { color: var(--acc); border-color: var(--acc); }

@media (min-width: 900px) {
  .keypad { grid-template-columns: repeat(4, 1fr); }
  .keypad.has-adv {
    grid-template-columns: repeat(7, 1fr);
  }
}

/* ---------- 程序员计算器 ---------- */
.prog-wrap { max-width: 760px; }
.prog-bases { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }
.prog-row {
  display: flex; align-items: center; gap: 12px; background: var(--num);
  border: 1px solid var(--line); border-radius: 10px; padding: 6px 12px;
}
.prog-row label {
  width: 52px; font-family: var(--mono); font-weight: 700; font-size: 13px; text-align: center;
  padding: 3px 0; border-radius: 6px; flex-shrink: 0;
}
.prog-row .hex { color: #ff9fb0; } .prog-row .dec { color: #7ee0a8; }
.prog-row .oct { color: #ffd479; } .prog-row .bin { color: #8fd3ff; }
.prog-val { font-family: var(--mono); font-size: 18px; color: #fff; word-break: break-all; }
.prog-val.bin-sm { font-size: 13px; }
.prog-ctrl { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; font-size: 13px; color: var(--muted); }
.prog-ctrl select { background: var(--num); color: var(--txt); border: 1px solid var(--line); border-radius: 8px; padding: 6px 8px; }
.prog-input-hint { margin-left: auto; }
.prog-keypad { grid-template-columns: repeat(6, 1fr) !important; }
.prog-keypad .k { padding: 10px 2px; font-size: 14px; }
.prog-base-keys { display: flex; gap: 8px; margin-top: 10px; }
.bkey { flex: 1; background: var(--num); border: 1px solid var(--line); color: var(--muted); padding: 8px; border-radius: 8px; font-family: var(--mono); }
.bkey.active { border-color: var(--acc); color: var(--acc); background: rgba(79,140,255,.1); }

/* ---------- 换算 ---------- */
.conv-box {
  display: grid; grid-template-columns: 1fr auto 1fr; gap: 14px; align-items: center;
  margin: 6px 0 10px;
}
.conv-side { display: flex; flex-direction: column; gap: 8px; }
.conv-side input {
  background: var(--num); border: 1px solid var(--line); color: var(--txt);
  border-radius: 10px; padding: 12px; font-size: 20px; font-family: var(--mono); outline: none; width: 100%;
}
.conv-side input:focus { border-color: var(--acc); }
.conv-side select {
  background: var(--num); color: var(--txt); border: 1px solid var(--line);
  border-radius: 8px; padding: 9px 10px; font-size: 14px;
}
.swap-btn {
  background: linear-gradient(135deg, var(--acc), var(--acc2)); border: none; color: #fff;
  width: 42px; height: 42px; border-radius: 50%; font-size: 17px; flex-shrink: 0;
}
.conv-side.out input { color: #7ee0a8; }
.rate-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px,1fr)); gap: 8px; margin-top: 8px; }
.rate-item { display: flex; align-items: center; gap: 8px; background: var(--num); border: 1px solid var(--line); border-radius: 8px; padding: 6px 8px; }
.rate-item .cc { width: 52px; flex-shrink: 0; font-size: 13px; color: var(--muted); font-weight: 600; }
.rate-item input { flex: 1; min-width: 0; background: none; border: none; color: var(--txt); font-family: var(--mono); outline: none; font-size: 13px; }

/* ---------- BMI ---------- */
.bmi-scale { display: flex; flex-direction: column; gap: 8px; }
.bmi-row { display: flex; justify-content: space-between; padding: 10px 12px; border-radius: 9px; }
.bmi-row.lo { background: rgba(79,140,255,.15); }
.bmi-row.ok { background: rgba(46,194,126,.15); }
.bmi-row.warn { background: rgba(245,165,36,.15); }
.bmi-row.hi { background: rgba(244,80,110,.15); }

/* ---------- 统计输出 ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px,1fr)); gap: 10px; margin-top: 14px; }
.stat-cell { background: var(--num); border: 1px solid var(--line); border-radius: 10px; padding: 12px; text-align: center; }
.stat-cell .v { font-size: 19px; font-weight: 700; color: #fff; font-family: var(--mono); word-break: break-all; }
.stat-cell .l { font-size: 12px; color: var(--muted); margin-top: 4px; }

/* ---------- 结果卡片 ---------- */
#lnRes, #cpRes { display: flex; flex-direction: column; gap: 12px; }
.sum-card { background: var(--num); border: 1px solid var(--line); border-radius: 10px; padding: 14px; }
.sum-card .s-l { font-size: 12px; color: var(--muted); }
.sum-card .s-v { font-size: 22px; font-weight: 700; color: #fff; font-family: var(--mono); }
.sum-card.hl { border-color: rgba(79,140,255,.5); background: rgba(79,140,255,.08); }
.sum-card .s-v.green { color: #7ee0a8; }
.sum-card .s-v.red { color: #ff9fb0; }

/* ---------- 关于 ---------- */
.about-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px,1fr)); gap: 10px; margin-bottom: 8px; }
.about-item { background: var(--num); border: 1px solid var(--line); border-radius: 9px; padding: 10px 12px; }
.about-item b { display: block; color: #cfe0ff; margin-bottom: 4px; font-size: 13px; }
.about-item span { color: var(--muted); font-size: 12px; line-height: 1.6; }

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .sidebar { display: none; }
  body.nav-open .sidebar {
    display: flex; position: fixed; top: 0; left: 0; bottom: 0; z-index: 60;
    width: min(300px, 86vw); max-height: none; height: 100vh;
    box-shadow: 0 0 40px rgba(0,0,0,.5);
  }
  body.nav-open::before {
    content: ''; position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 55;
  }
  .app { flex-direction: column; }
  .menu-btn { display: inline-block; }
  .main { width: 100%; }
  .topbar { flex-wrap: wrap; padding: 12px 16px; }
  .sections { padding: 14px 16px 60px; }
  .grid-2 { grid-template-columns: 1fr; }
  .conv-box { grid-template-columns: 1fr; }
  .swap-btn { width: 100%; height: 38px; border-radius: 10px; }
}