/* ============================================================
   MyntOptics Engineering Tools — shared design system
   ============================================================ */
:root {
  --bg: #0a101e;
  --bg-2: #0e1626;
  --panel: #111c30;
  --panel-2: #16233c;
  --border: #22304d;
  --text: #e8eefa;
  --muted: #93a5c4;
  --faint: #5d7194;
  --accent: #3fc1ff;
  --accent-dim: #1d6f9c;
  --accent-2: #ffb454;
  --good: #3ddc97;
  --bad: #ff6b6b;
  --mono: "JetBrains Mono", "Cascadia Code", Consolas, "SF Mono", monospace;
  --radius: 10px;
  --shadow: 0 10px 30px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(63, 193, 255, .07), transparent 60%),
    radial-gradient(900px 420px at 10% -10%, rgba(255, 180, 84, .05), transparent 60%),
    var(--bg);
  color: var(--text);
  font: 15px/1.55 "Inter", "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.25; }
code { font-family: var(--mono); font-size: .92em; color: var(--accent-2); }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 18px;
  padding: 12px 26px;
  background: rgba(10, 16, 30, .85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { height: 26px; display: block; }
.brand .suite {
  font-size: 12px; letter-spacing: .18em; text-transform: uppercase;
  color: var(--muted); border-left: 1px solid var(--border); padding-left: 12px;
}
.topbar nav { margin-left: auto; display: flex; gap: 18px; align-items: center; }
.topbar nav a { color: var(--muted); font-size: 13.5px; }
.topbar nav a:hover { color: var(--text); text-decoration: none; }
.topbar nav a.cta {
  color: #06121f; background: var(--accent); padding: 7px 14px;
  border-radius: 999px; font-weight: 600;
}

/* ---------- hub (index) ---------- */
.hero { max-width: 1180px; margin: 56px auto 8px; padding: 0 26px; }
.hero h1 { font-size: clamp(28px, 4vw, 44px); margin: 0 0 12px; font-weight: 750; letter-spacing: -.02em; }
.hero h1 em { color: var(--accent); font-style: normal; }
.hero p { color: var(--muted); max-width: 760px; font-size: 16.5px; margin: 0; }

.tool-grid {
  max-width: 1180px; margin: 34px auto 70px; padding: 0 26px;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 18px;
}
.card {
  display: flex; flex-direction: column; gap: 10px;
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 22px 18px; color: var(--text);
  transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.card:hover { transform: translateY(-3px); border-color: var(--accent-dim); box-shadow: var(--shadow); text-decoration: none; }
.card .icon {
  width: 42px; height: 42px; border-radius: 9px; display: grid; place-items: center;
  background: rgba(63, 193, 255, .1); border: 1px solid rgba(63, 193, 255, .25);
}
.card .icon svg { width: 24px; height: 24px; stroke: var(--accent); fill: none; stroke-width: 1.6; }
.card h3 { margin: 4px 0 0; font-size: 17.5px; font-weight: 650; }
.card p { margin: 0; color: var(--muted); font-size: 13.8px; flex: 1; }
.card .tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 4px; }
.badge {
  font-size: 11px; letter-spacing: .04em; color: var(--muted);
  border: 1px solid var(--border); border-radius: 999px; padding: 2.5px 9px;
  background: rgba(255, 255, 255, .025);
}

/* ---------- tool page layout ---------- */
.tool-head { max-width: 1460px; margin: 26px auto 0; padding: 0 26px; width: 100%; }
.tool-head .crumbs { font-size: 13px; color: var(--faint); margin-bottom: 6px; }
.tool-head h1 { margin: 0; font-size: 26px; font-weight: 700; letter-spacing: -.01em; }
.tool-head .sub { color: var(--muted); margin: 6px 0 0; max-width: 900px; font-size: 14.5px; }

.tool-layout {
  display: grid; grid-template-columns: 380px minmax(0, 1fr); gap: 20px;
  max-width: 1460px; margin: 20px auto 60px; padding: 0 26px; width: 100%;
  align-items: start; flex: 1;
}
@media (max-width: 980px) { .tool-layout { grid-template-columns: 1fr; } }

.panel {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
}
.panel h2 {
  margin: 0 0 14px; font-size: 13px; font-weight: 650; color: var(--muted);
  text-transform: uppercase; letter-spacing: .14em;
  display: flex; align-items: center; gap: 8px;
}
.panel h2::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.panel + .panel { margin-top: 20px; }
.stack > .panel + .panel { margin-top: 20px; }

/* ---------- form fields ---------- */
.field { margin-bottom: 13px; }
.field label { display: block; font-size: 12.5px; color: var(--muted); margin-bottom: 5px; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.row3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
.inwrap { position: relative; display: flex; }
input[type="number"], input[type="text"], select {
  width: 100%; background: var(--bg-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 7px;
  padding: 8px 11px; font: 14px var(--mono); outline: none;
  transition: border-color .12s ease;
}
input:focus, select:focus { border-color: var(--accent-dim); }
.inwrap .unit {
  position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
  font-size: 11.5px; color: var(--faint); pointer-events: none; font-family: var(--mono);
}
.inwrap input { padding-right: 46px; }
select { appearance: none; cursor: pointer; }
input[type="range"] { width: 100%; accent-color: var(--accent); }
.check { display: flex; gap: 8px; align-items: center; font-size: 13.5px; color: var(--muted); }
.check input { accent-color: var(--accent); }

.btn {
  display: inline-flex; align-items: center; gap: 7px; cursor: pointer;
  background: var(--accent); color: #06121f; border: none; border-radius: 7px;
  padding: 8px 16px; font: 600 13.5px "Inter", "Segoe UI", sans-serif;
  transition: filter .12s ease;
}
.btn:hover { filter: brightness(1.12); }
.btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent-dim); }
.btn.small { padding: 5px 11px; font-size: 12.5px; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 6px; }

/* ---------- results ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(165px, 1fr)); gap: 12px; }
.stat {
  background: var(--bg-2); border: 1px solid var(--border); border-radius: 8px;
  padding: 11px 13px;
}
.stat .k { font-size: 11.5px; color: var(--faint); letter-spacing: .04em; text-transform: uppercase; }
.stat .v { font: 600 17px var(--mono); color: var(--text); margin-top: 3px; }
.stat .v small { font-size: 11.5px; color: var(--muted); font-weight: 400; }
.stat.accent .v { color: var(--accent); }
.stat.warn .v { color: var(--accent-2); }
.stat.good .v { color: var(--good); }
.stat.bad .v { color: var(--bad); }

.canvas-wrap { background: var(--bg-2); border: 1px solid var(--border); border-radius: 8px; padding: 8px; }
.canvas-wrap canvas { display: block; width: 100%; }
.canvas-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 1200px) { .canvas-row { grid-template-columns: 1fr; } }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; }
table.data { width: 100%; border-collapse: collapse; font: 13px var(--mono); }
table.data th {
  text-align: left; color: var(--faint); font: 600 11px "Inter", sans-serif;
  text-transform: uppercase; letter-spacing: .07em;
  padding: 7px 9px; border-bottom: 1px solid var(--border); white-space: nowrap;
}
table.data td { padding: 5px 9px; border-bottom: 1px solid rgba(34, 48, 77, .55); white-space: nowrap; }
table.data input, table.data select { padding: 4.5px 8px; font-size: 12.5px; }
table.data td.num { text-align: right; }
table.data .rowbtn {
  cursor: pointer; border: none; background: transparent; color: var(--faint);
  font-size: 15px; padding: 2px 6px; border-radius: 5px;
}
table.data .rowbtn:hover { color: var(--bad); background: rgba(255, 107, 107, .1); }

/* ---------- misc ---------- */
.note {
  font-size: 12.8px; color: var(--muted); background: rgba(63, 193, 255, .06);
  border: 1px solid rgba(63, 193, 255, .18); border-radius: 8px; padding: 10px 13px;
  margin-top: 14px;
}
.note b { color: var(--text); }
.divider { height: 1px; background: var(--border); margin: 16px 0; }
.legend-chip { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 6px; }
.tabs { display: flex; gap: 6px; margin-bottom: 12px; flex-wrap: wrap; }
.tabs button {
  background: transparent; border: 1px solid var(--border); color: var(--muted);
  border-radius: 999px; padding: 6px 15px; font: 600 12.5px "Inter", sans-serif; cursor: pointer;
}
.tabs button.active { background: rgba(63, 193, 255, .12); border-color: var(--accent-dim); color: var(--accent); }
.muted { color: var(--muted); }
.small { font-size: 12.5px; }
.mono { font-family: var(--mono); }

footer {
  margin-top: auto; border-top: 1px solid var(--border);
  padding: 22px 26px; display: flex; gap: 14px; align-items: center; flex-wrap: wrap;
  color: var(--faint); font-size: 12.8px;
}
footer .sep { color: var(--border); }
footer a { color: var(--muted); }