/* ASME IX-2023 | Copper / Amber theme */
* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
  background: #1a1208;
  color: #f0e6d6;
  font-size: 15px;
  line-height: 1.55;
  min-height: 100vh;
}

/* ---------- Top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 24px;
  background: linear-gradient(135deg, #3d2415 0%, #1f1309 100%);
  box-shadow: 0 2px 12px rgba(0,0,0,0.4);
}
.topbar-left, .topbar-right { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }

.btn-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.15);
  color: #f0e6d6;
  padding: 7px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  transition: background 0.2s;
}
.btn-top:hover { background: rgba(255,255,255,0.13); }
.btn-top svg { flex-shrink: 0; }
.lang-select {
  padding: 7px 12px;
  min-width: 120px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.25);
  color: #f0e6d6;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  flex-shrink: 0;
}
.lang-select option { background: #2c1c0e; color: #f0e6d6; }

/* ---------- Container & header ---------- */
.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 28px 20px 60px;
}
.header { text-align: center; margin-bottom: 24px; }
.header h1 {
  font-size: 1.65rem;
  font-weight: 700;
  color: #ffb946;
  letter-spacing: 0.3px;
}
.subtitle { font-size: 0.9rem; color: #b79a74; margin-top: 4px; }

/* ---------- Tabs ---------- */
.tabs {
  display: flex;
  gap: 2px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}
.tab-btn {
  flex: 1;
  min-width: 120px;
  padding: 9px 14px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-bottom: none;
  border-radius: 7px 7px 0 0;
  color: #b79a74;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  text-align: center;
}
.tab-btn:hover { background: rgba(255,185,70,0.1); color: #f0e6d6; }
.tab-btn.active {
  background: #ffb946;
  color: #2c1810;
  font-weight: 600;
  border-color: #ffb946;
}

/* ---------- Panels ---------- */
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.panel-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: #ffb946;
  margin-bottom: 6px;
}
.panel-subtitle {
  font-size: 1.05rem;
  font-weight: 600;
  color: #f0c87a;
  margin: 18px 0 8px;
}
.panel-intro { color: #a88c6a; font-size: 0.88rem; margin-bottom: 16px; }

/* ---------- Form grid ---------- */
.form-grid { margin-top: 10px; }
.form-row { display: flex; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.form-group { flex: 1; min-width: 0; }
.form-group.cols-1 { flex-basis: 100%; }
.form-group.cols-2 { flex-basis: calc(50% - 6px); flex-grow: 0; }
.form-group.cols-3 { flex-basis: calc(33.33% - 8px); flex-grow: 0; }
.form-group label {
  display: block;
  font-size: 0.82rem;
  color: #c4a882;
  margin-bottom: 4px;
  font-weight: 500;
}
.form-group input,
.form-group select {
  width: 100%;
  padding: 9px 12px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 6px;
  color: #f0e6d6;
  font-size: 14px;
  transition: border-color 0.2s;
}
.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: #ffb946;
  box-shadow: 0 0 0 2px rgba(255,185,70,0.15);
}
.form-group select option { background: #2c1c0e; color: #f0e6d6; }

/* ---------- Buttons ---------- */
.calc-btn {
  display: inline-block;
  padding: 10px 28px;
  background: #ffb946;
  color: #2c1810;
  border: none;
  border-radius: 7px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  margin-top: 4px;
}
.calc-btn:hover { background: #ffc864; }
.calc-btn:active { transform: scale(0.97); }
.calc-btn-sm { font-size: 13px; }
.calc-btn-group { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }

/* ---------- Mech sub-tabs ---------- */
.mech-nav {
  display: flex;
  gap: 4px;
  margin-bottom: 18px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.mech-btn {
  padding: 9px 20px;
  background: transparent;
  border: none;
  color: #b79a74;
  cursor: pointer;
  font-size: 14px;
  border-bottom: 3px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.mech-btn:hover { color: #f0e6d6; }
.mech-btn-active {
  color: #ffb946;
  border-bottom-color: #ffb946;
  font-weight: 600;
}

/* ---------- Result box ---------- */
.result-box {
  margin-top: 16px;
  padding: 16px 20px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 9px;
  font-size: 0.9rem;
  animation: fadein 0.25s ease;
}
@keyframes fadein { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.result-pass { border-color: rgba(76,175,80,0.4); background: rgba(76,175,80,0.06); }
.result-fail { border-color: rgba(244,67,54,0.45); background: rgba(244,67,54,0.07); }
.result-info { border-color: rgba(255,185,70,0.25); }
.result h3 { color: #ffb946; font-size: 0.95rem; margin: 6px 0 8px; }
.result h3:first-child { margin-top: 0; }

.res-row {
  display: flex;
  justify-content: space-between;
  padding: 5px 0;
  border-bottom: 1px dotted rgba(255,255,255,0.07);
  gap: 16px;
}
.res-row:last-child { border-bottom: none; }
.res-label { color: #a88c6a; flex-shrink: 0; }
.res-val { color: #f0e6d6; text-align: right; font-weight: 500; }

.bigtext {
  font-size: 1.15rem;
  font-weight: 700;
  padding: 10px 0;
  text-align: center;
  margin-top: 6px;
}
.bigtext.pass { color: #4caf50; }
.bigtext.fail { color: #f44336; }

.note-box {
  margin-top: 14px;
  padding: 10px 14px;
  border-left: 3px solid #ffb946;
  background: rgba(255,185,70,0.06);
  font-size: 0.82rem;
  color: #c4a882;
  border-radius: 0 6px 6px 0;
}

/* ---------- Question rows (Variables tab) ---------- */
.qrow {
  padding: 12px 16px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 8px;
  margin-bottom: 10px;
}
.qtext {
  font-weight: 600;
  color: #f0e6d6;
  margin-bottom: 8px;
  font-size: 0.92rem;
}
.qopt {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-right: 22px;
  font-size: 0.9rem;
  color: #c4a882;
  cursor: pointer;
}
.qopt input[type="radio"] { cursor: pointer; accent-color: #ffb946; }

.search-hint { color: #8a7050; font-size: 0.8rem; margin-bottom: 8px; }

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  padding: 18px 20px 30px;
  color: #7a6040;
  font-size: 0.78rem;
  border-top: 1px solid rgba(255,255,255,0.06);
  margin-top: 40px;
}

/* ---------- Responsive ---------- */
@media (max-width: 700px) {
  .container { padding: 16px 12px 40px; }
  .form-group.cols-2, .form-group.cols-3 { flex-basis: 100%; }
  .tab-btn { font-size: 11px; padding: 7px 6px; min-width: 80px; }
  .topbar { padding: 8px 12px; }
  .label-full { display: none; }
  .btn-top { padding: 6px 10px; }
  .mech-btn { padding: 7px 12px; font-size: 12px; }
}