@charset "utf-8";
/* CSS Document */
/* ═══════════════════════════════════════
   RESET & BASE
═══════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background-color: #F8F3E7;
  color: #2F3437;
  font-size: 16px;
}

a { text-decoration: none; color: inherit; }

/* ═══════════════════════════════════════
   BREADCRUMB
═══════════════════════════════════════ */
.breadcrumb {
  background-color: #e8e2d6;
  padding: 10px 24px;
  font-size: 0.85rem;
  color: #555;
  border-bottom: 1px solid #d5cfc5;
}
.breadcrumb a { color: #1D3557; font-weight: 600; }
.breadcrumb a:hover { text-decoration: underline; }
.bc-sep { margin: 0 6px; color: #aaa; }
.bc-current { color: #2F3437; font-weight: 600; }

/* ═══════════════════════════════════════
   PAGE WRAPPER
═══════════════════════════════════════ */
.page-wrapper { max-width: 960px; margin: 0 auto; padding: 24px 20px 40px; }

/* ═══════════════════════════════════════
   PAGE TITLE BLOCK
═══════════════════════════════════════ */
.page-title-block {
  background: linear-gradient(135deg, #1D3557 0%, #2a4d73 100%);
  color: #F8F3E7;
  border-radius: 8px;
  padding: 36px 32px;
  margin-bottom: 28px;
}
.page-title-label {
  font-size: 0.8rem; font-weight: 700; letter-spacing: 0.12em;
  text-transform: uppercase; color: #F5B041; margin-bottom: 8px;
}
.page-title-main { font-size: 2rem; font-weight: 700; line-height: 1.2; margin-bottom: 12px; }
.page-title-sub  { font-size: 1rem; opacity: 0.85; line-height: 1.6; max-width: 680px; }

/* ═══════════════════════════════════════
   QUICK NAV
═══════════════════════════════════════ */
.quick-nav-label {
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; color: #888; margin-bottom: 0.75rem;
}
.quick-nav-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 0.6rem; margin-bottom: 2.5rem;
}
.qnav-card {
  background: #ffffff; border: 1px solid #e0dbd2; border-radius: 8px;
  padding: 0.75rem 0.5rem; text-align: center; color: #1D3557;
  font-size: 0.78rem; font-weight: 600; cursor: pointer;
  transition: box-shadow 0.2s, border-color 0.2s, transform 0.15s;
  text-decoration: none; display: flex; flex-direction: column;
  align-items: center; gap: 0.35rem;
}
.qnav-card:hover {
  border-color: #2a4d73; box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transform: translateY(-2px);
}
.qnav-card.active {
  border-color: #2a4d73; box-shadow: 0 4px 16px rgba(0,0,0,0.12);
  transform: translateY(-2px); background-color: #1D3557; color: #fff;
}
.qnav-card.active .qnav-icon { filter: brightness(1.3); }
.qnav-icon { font-size: 1.7rem; line-height: 1; }

/* ═══════════════════════════════════════
   ARTICLE / SECTION
═══════════════════════════════════════ */
.section-art-txt {
  margin: 0 0 28px 0; padding: 28px 28px 24px;
  background-color: #ffffff; border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.07);
}
.section-art-title {
  font-size: 1.2rem; font-weight: 700; color: #1D3557;
  border-left: 4px solid #E63946; padding-left: 12px;
  margin-bottom: 20px; line-height: 1.3;
}
.section-art-txt > p { font-size: 1rem; color: #2F3437; line-height: 1.6; margin-bottom: 16px; }
.sub-heading {
  font-size: 1rem; font-weight: 700; color: #1D3557;
  margin: 24px 0 10px; padding-bottom: 4px;
  border-bottom: 1px solid #e0dbd2;
}

/* ═══════════════════════════════════════
   DEFINITION CARDS
═══════════════════════════════════════ */
.definition-cards {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px; margin-top: 8px; margin-bottom: 24px;
}
.def-card { border-radius: 8px; padding: 20px 18px; border-top: 5px solid transparent; }
.def-card--blue   { background: #EBF2FA; border-top-color: #1D3557; }
.def-card--red    { background: #FEF0F0; border-top-color: #E63946; }
.def-card--gold   { background: #FEF9EC; border-top-color: #F5B041; }
.def-card--green  { background: #F0F7F4; border-top-color: #2E7D52; }
.def-card--slate  { background: #ECEFF1; border-top-color: #455A64; }
.def-card--purple { background: #F3EFF8; border-top-color: #6A0DAD; }
.def-card-icon { font-size: 1.8rem; margin-bottom: 8px; }
.def-card h4 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; color: #1D3557; }
.def-card p  { font-size: 0.9rem; line-height: 1.55; color: #3a3f42; }

/* ═══════════════════════════════════════
   MOTOR CONSTRUCTION DIAGRAM (CSS)
═══════════════════════════════════════ */
.motor-diagram {
  display: flex; align-items: stretch; gap: 0;
  border: 2px solid #9aa5ae; border-radius: 8px; overflow: hidden;
  margin: 20px 0 24px; background: #e8edf0;
}
.motor-endbell {
  width: 48px; flex-shrink: 0;
  background: linear-gradient(to bottom, #b0bec5, #90a4ae);
  display: flex; align-items: center; justify-content: center;
  writing-mode: vertical-rl; font-size: 0.62rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase; color: #37474f;
}
.motor-body {
  flex: 1; display: flex; flex-direction: column; background: #cfd8dc;
  padding: 12px 16px; gap: 8px;
}
.motor-body-label {
  font-size: 0.65rem; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; color: #37474f; text-align: center;
}
.motor-stator {
  background: linear-gradient(to right, #1D3557, #2a4d73, #1D3557);
  border-radius: 4px; padding: 10px 0; text-align: center;
  color: #F8F3E7; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.08em;
}
.motor-gap {
  height: 6px; background: #b0bec5; border-radius: 2px;
  border: 1px dashed #78909c; display: flex; align-items: center;
  justify-content: center;
}
.motor-gap span {
  font-size: 0.6rem; color: #546e7a; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase;
  background: #b0bec5; padding: 0 4px;
}
.motor-rotor {
  background: linear-gradient(to right, #455A64, #607D8B, #455A64);
  border-radius: 4px; padding: 10px 0; text-align: center;
  color: #fff; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.08em;
}
.motor-shaft {
  height: 8px; background: #78909c; border-radius: 2px;
  display: flex; align-items: center; justify-content: center;
}
.motor-shaft span {
  font-size: 0.6rem; color: #fff; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase;
}

/* ═══════════════════════════════════════
   PARTS GRID (Motor components)
═══════════════════════════════════════ */
.parts-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px; margin-top: 12px;
}
.part-card {
  border-radius: 6px; padding: 14px 14px 12px;
  border: 1px solid #e0dbd2;
}
.part-card--stator  { background: #EBF2FA; border-left: 3px solid #1D3557; }
.part-card--rotor   { background: #ECEFF1; border-left: 3px solid #455A64; }
.part-card--bearing { background: #FEF9EC; border-left: 3px solid #F5B041; }
.part-card--housing { background: #F0F7F4; border-left: 3px solid #2E7D52; }
.part-card--shaft   { background: #FEF0F0; border-left: 3px solid #E63946; }
.part-name { font-size: 0.82rem; font-weight: 700; color: #1D3557; display: block; margin-bottom: 5px; }
.part-desc { font-size: 0.82rem; line-height: 1.5; color: #3a3f42; }

/* ═══════════════════════════════════════
   SYNCHRONOUS SPEED TABLE STRIP
═══════════════════════════════════════ */
.speed-strip {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 8px; margin: 16px 0;
}
.speed-cell {
  background: #EBF2FA; border-radius: 6px; padding: 10px 8px;
  text-align: center; border-top: 3px solid #1D3557;
}
.speed-poles { font-size: 0.68rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: #555; margin-bottom: 4px; }
.speed-rpm   { font-size: 1.2rem; font-weight: 900; color: #1D3557; }
.speed-label { font-size: 0.68rem; color: #888; margin-top: 2px; }

/* ═══════════════════════════════════════
   REGULATION BLOCKS
═══════════════════════════════════════ */
.reg-block { border: 1px solid #e0dbd2; border-radius: 8px; overflow: hidden; margin-bottom: 20px; }
.reg-block-header { display: flex; align-items: center; gap: 12px; padding: 14px 18px; }
.reg-hdr--blue   { background-color: #1D3557; color: #F8F3E7; }
.reg-hdr--red    { background-color: #E63946; color: #F8F3E7; }
.reg-hdr--green  { background-color: #2E7D52; color: #F8F3E7; }
.reg-hdr--orange { background-color: #E67E22; color: #F8F3E7; }
.reg-hdr--slate  { background-color: #455A64; color: #F8F3E7; }
.reg-hdr--gold   { background-color: #D4890A; color: #fff; }
.reg-hdr--purple { background-color: #6A0DAD; color: #fff; }
.reg-icon { font-size: 1.3rem; flex-shrink: 0; }
.reg-block-header h4 { font-size: 1rem; font-weight: 700; flex: 1; line-height: 1.3; }
.reg-block-body { padding: 18px 20px; background-color: #fdfcfa; }
.reg-block-body p { font-size: 0.95rem; line-height: 1.6; color: #2F3437; margin-bottom: 12px; }
.reg-block-body p:last-child { margin-bottom: 0; }

/* ═══════════════════════════════════════
   CHECK LIST
═══════════════════════════════════════ */
.check-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.check-list li { font-size: 0.95rem; color: #2F3437; padding-left: 24px; position: relative; line-height: 1.5; }
.check-list li::before { content: '✓'; position: absolute; left: 0; color: #2E7D52; font-weight: 700; }

/* ═══════════════════════════════════════
   RIGHTS & RESPONSIBILITIES GRID
═══════════════════════════════════════ */
.rights-resp-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 20px; }
.rr-col { border-radius: 6px; padding: 14px 16px; }
.rr-col--rights { background-color: #EBF2FA; border-left: 3px solid #1D3557; }
.rr-col--resp   { background-color: #FEF9EC; border-left: 3px solid #F5B041; }
.rr-col--green  { background-color: #F0F7F4; border-left: 3px solid #2E7D52; }
.rr-col--red    { background-color: #FEF0F0; border-left: 3px solid #E63946; }
.rr-col--slate  { background-color: #ECEFF1; border-left: 3px solid #455A64; }
.rr-col--purple { background-color: #F3EFF8; border-left: 3px solid #6A0DAD; }
.rr-col h5 { font-size: 0.85rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; margin-bottom: 10px; color: #1D3557; }
.rr-col ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.rr-col ul li { font-size: 0.9rem; line-height: 1.5; color: #2F3437; padding-left: 16px; position: relative; }
.rr-col ul li::before { content: '•'; position: absolute; left: 0; color: #888; }

/* ═══════════════════════════════════════
   CALLOUT
═══════════════════════════════════════ */
.callout { display: flex; gap: 14px; align-items: flex-start; border-radius: 8px; padding: 16px 18px; margin-top: 16px; }
.callout--tip  { background-color: #EBF2FA; border-left: 4px solid #1D3557; }
.callout--warn { background-color: #FEF9EC; border-left: 4px solid #F5B041; }
.callout--red  { background-color: #FEF0F0; border-left: 4px solid #E63946; }
.callout--green{ background-color: #F0F7F4; border-left: 4px solid #2E7D52; }
.callout-icon  { font-size: 1.4rem; flex-shrink: 0; }
.callout strong { display: block; font-size: 0.9rem; color: #1D3557; margin-bottom: 4px; }
.callout p { font-size: 0.9rem; line-height: 1.55; color: #2F3437; margin: 0; }

/* ═══════════════════════════════════════
   FORMULA BOX
═══════════════════════════════════════ */
.formula-box {
  background-color: #f4f1e8; border-left: 4px solid #1D3557;
  border-radius: 6px; padding: 14px 20px; margin: 14px 0;
}
.formula-box p { margin: 4px 0; color: #1D3557; font-size: 1rem; font-weight: 700; }
.formula-note  { font-size: 0.82rem !important; font-weight: 400 !important; color: #555 !important; }

/* ═══════════════════════════════════════
   MOTOR TYPE CARDS
═══════════════════════════════════════ */
.motor-type-card {
  border-radius: 8px; border: 1px solid #e0dbd2;
  overflow: hidden; margin-bottom: 20px;
}
.mtc-header {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 20px; color: #F8F3E7;
}
.mtc-header--slate  { background: linear-gradient(135deg, #455A64, #546e7a); }
.mtc-header--blue   { background: linear-gradient(135deg, #1D3557, #2a4d73); }
.mtc-header--green  { background: linear-gradient(135deg, #2E7D52, #388E5C); }
.mtc-header--gold   { background: linear-gradient(135deg, #D4890A, #E5980B); }
.mtc-header--purple { background: linear-gradient(135deg, #6A0DAD, #7B1FBE); }
.mtc-badge {
  font-size: 0.65rem; font-weight: 900; letter-spacing: 0.1em;
  text-transform: uppercase; background: rgba(255,255,255,0.25);
  padding: 3px 8px; border-radius: 20px; white-space: nowrap;
}
.mtc-title { font-size: 1rem; font-weight: 700; line-height: 1.3; flex: 1; }
.mtc-icon  { font-size: 1.8rem; flex-shrink: 0; }
.mtc-body  { display: grid; grid-template-columns: 1fr 1fr; background: #fdfcfa; }
.mtc-col   { padding: 16px 18px; }
.mtc-col:first-child { border-right: 1px solid #e0dbd2; }
.mtc-col h5 {
  font-size: 0.78rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: #555; margin-bottom: 10px;
}
.mtc-col ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 6px; }
.mtc-col ul li { font-size: 0.88rem; line-height: 1.5; color: #2F3437; padding-left: 16px; position: relative; }
.mtc-col ul li::before { content: '•'; position: absolute; left: 0; color: #888; }
.mtc-col p  { font-size: 0.88rem; line-height: 1.55; color: #2F3437; margin-bottom: 8px; }
.mtc-col p:last-child { margin-bottom: 0; }
.mtc-apps {
  padding: 10px 18px; border-top: 1px solid #e0dbd2;
  background: #f4f1e8; font-size: 0.82rem; color: #555;
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
.mtc-apps-label { font-weight: 700; color: #1D3557; white-space: nowrap; }
.mtc-tag {
  background: #1D3557; color: #F8F3E7; padding: 2px 10px;
  border-radius: 20px; font-size: 0.75rem; font-weight: 600;
}

/* ═══════════════════════════════════════
   MOTOR TYPE STAT BARS
═══════════════════════════════════════ */
.stat-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.stat-item { display: flex; flex-direction: column; gap: 3px; }
.stat-label { font-size: 0.75rem; font-weight: 700; color: #555; }
.stat-bar-wrap { height: 8px; background: #e0dbd2; border-radius: 4px; overflow: hidden; }
.stat-bar { height: 100%; border-radius: 4px; transition: width 0.4s ease; }
.stat-bar--low    { background: #E63946; }
.stat-bar--med    { background: #F5B041; }
.stat-bar--high   { background: #2E7D52; }
.stat-val { font-size: 0.75rem; color: #555; }

/* ═══════════════════════════════════════
   COMPARISON TABLE
═══════════════════════════════════════ */
.styled-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.styled-table th {
  background-color: #1D3557; color: #F8F3E7; padding: 10px 12px;
  text-align: left; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.04em;
}
.styled-table td { padding: 9px 12px; border-bottom: 1px solid #e8e2d6; color: #2F3437; vertical-align: middle; }
.styled-table tbody tr:nth-child(even) { background-color: #f9f7f2; }
.styled-table tbody tr:hover { background-color: #EBF2FA; }
.data-table-wrap { overflow-x: auto; margin-bottom: 4px; }
.pill {
  display: inline-block; padding: 2px 10px; border-radius: 20px;
  font-size: 0.75rem; font-weight: 700;
}
.pill--red    { background: #FEF0F0; color: #E63946; border: 1px solid #E63946; }
.pill--gold   { background: #FEF9EC; color: #D4890A; border: 1px solid #D4890A; }
.pill--green  { background: #F0F7F4; color: #2E7D52; border: 1px solid #2E7D52; }
.pill--blue   { background: #EBF2FA; color: #1D3557; border: 1px solid #1D3557; }
.pill--slate  { background: #ECEFF1; color: #455A64; border: 1px solid #455A64; }
.pill--purple { background: #F3EFF8; color: #6A0DAD; border: 1px solid #6A0DAD; }

/* ═══════════════════════════════════════
   OUTCOMES LIST
═══════════════════════════════════════ */
.outcomes-list { list-style: none; margin: 12px 0 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.outcomes-list li { font-size: 0.95rem; color: #2F3437; padding-left: 28px; position: relative; line-height: 1.55; }
.outcomes-list li::before { content: "✔"; position: absolute; left: 0; color: #2E7D52; font-weight: 700; font-size: 1rem; }


/* QUIZ NAV */
.quiz-nav-container {
  text-align: center;
  margin-bottom: 0.75rem;
}

.quiz-nav {
  display: flex;
  justify-content: center;
}

.quiz-nav-btn {
  display: inline-block;
  background-color: #E63946;
  color: #F8F3E7;
  text-decoration: none;
  padding: 0.85rem 1.4rem;
  border-radius: 0.5rem;
  font-weight: 600;
  transition: background-color 0.2s, transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 12px rgba(29, 53, 87, 0.18);
  border: 2px solid transparent;
}

.quiz-nav-btn:hover {
  background-color: #C92F3B;
  transform: translateY(-1px);
  box-shadow: 0 6px 14px rgba(29, 53, 87, 0.24);
}

.quiz-nav-btn:focus {
  outline: none;
  border-color: #F1C40F;
}

/* FOOTER NAV */
.main-footer-nav {
  background-color: #1D3557; display: flex; justify-content: center;
  gap: 12px; padding: 16px 24px; flex-wrap: wrap;
}
.main-footer-nav-btn {
  display: inline-block; background-color: #F5B041; color: #2F3437;
  font-weight: 700; font-size: 0.9rem; padding: 10px 24px;
  border-radius: 4px; transition: background-color 0.2s; text-decoration: none;
}
.main-footer-nav-btn:hover { background-color: #F8C471; }

/* ═══════════════════════════════════════
   SITE FOOTER
═══════════════════════════════════════ */
.site-footer { background-color: #2F3437; color: #F8F3E7; padding: 40px 24px 24px; }
.footer-container { display: flex; align-items: flex-start; justify-content: center; color: #F1C40F; gap: 32px; max-width: 1200px; margin: 0 auto; }
.footer-col { text-align: left; color: #F1C40F; margin: 0 50px; }
.footer-col a { color: #F1C40F; text-decoration: underline; transition: opacity 0.2s; }
.footer-col a:hover { opacity: 0.5; }
.footer-col h3 { font-size: 1.05rem; color: #F1C40F; margin-bottom: 10px; }
.footer-col p { font-size: 0.9rem; opacity: 0.8; line-height: 1.7; }
.footer-credit { text-align: center; font-size: 0.8rem; opacity: 0.6; margin-top: 24px; padding-top: 16px; border-top: 1px solid rgba(255,255,255,0.15); max-width: 1200px; margin-left: auto; margin-right: auto; }

/* ═══════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════ */
@media (max-width: 768px) {
  .page-title-main { font-size: 1.5rem; }
  .page-title-block { padding: 24px 20px; }
  .section-art-txt { padding: 20px 16px; }
  .section-art-title { font-size: 1rem; }
  .definition-cards { grid-template-columns: 1fr; }
  .rights-resp-grid { grid-template-columns: 1fr; }
  .quick-nav-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-container { flex-direction: column; gap: 20px; }
  .mtc-body { grid-template-columns: 1fr; }
  .mtc-col:first-child { border-right: none; border-bottom: 1px solid #e0dbd2; }
  .speed-strip { grid-template-columns: repeat(2, 1fr); }
  .parts-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .quick-nav-grid { grid-template-columns: repeat(2, 1fr); }
  .speed-strip { grid-template-columns: repeat(2, 1fr); }
  .parts-grid { grid-template-columns: 1fr; }
}

/* ── Back to Top ── */
.back-to-top {
  position: fixed; bottom: 28px; right: 24px; z-index: 999;
  padding: 10px 18px; font-size: 0.85rem; opacity: 0; pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  transform: translateY(10px); border-radius: 4px; box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}
.back-to-top.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }

/* ── Scroll Margin ── */
.section-art-txt[id], article[id] { scroll-margin-top: 80px; }

/* ── stat-bar green variant ── */
.stat-bar--green { background: #2E7D52; }

/* ── stat-bar green variant ── */
.stat-bar--green { background: #2E7D52; }