.formula-giam-chan {
  --shock-ink: #17324d;
  --shock-muted: #5f7388;
  --shock-line: #d8e0e8;
  --shock-panel: #ffffff;
  --shock-soft: linear-gradient(180deg, #f5fbff 0%, #edf5fb 100%);
  --shock-accent: #0f6d8c;
  --shock-accent-strong: #0c4d68;
  --shock-highlight: #ffb84d;
}

.shock-intro-section {
  padding: 28px 0 0;
}

.shock-intro-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 24px;
  padding: 28px 32px;
  border: 1px solid var(--shock-line);
  border-radius: 24px;
  background: var(--shock-soft);
  color: var(--shock-ink);
}

.shock-kicker {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--shock-accent);
}

.shock-intro-card h2 {
  margin: 0 0 12px;
  font-size: 22px;
  line-height: 1.12;
}

.shock-intro-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--shock-muted);
}

.shock-intro-note {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(15, 109, 140, 0.12);
}

.shock-intro-note strong {
  font-size: 13px;
  color: var(--shock-accent-strong);
}

.shock-intro-note span {
  font-size: 13px;
  line-height: 1.7;
  color: var(--shock-muted);
}

.shock-main-section {
  padding: 28px 0 60px;
}

.shock-tab-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.shock-tab-btn {
  padding: 12px 18px;
  border: 1px solid var(--shock-line);
  border-radius: 999px;
  background: #fff;
  color: var(--shock-ink);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition:
    transform 0.18s ease,
    background 0.18s ease,
    color 0.18s ease,
    border-color 0.18s ease;
}

.shock-tab-btn:hover,
.shock-tab-btn:focus-visible {
  transform: translateY(-1px);
  border-color: var(--shock-accent);
  outline: none;
}

.shock-tab-btn.active {
  background: var(--shock-accent);
  border-color: var(--shock-accent);
  color: #fff;
}

.shock-panel {
  padding: 28px;
  border: 1px solid var(--shock-line);
  border-radius: 24px;
  background: var(--shock-panel);
  box-shadow: 0 18px 40px rgba(16, 53, 76, 0.06);
}

.shock-layout {
  display: grid;
  grid-template-columns: minmax(280px, 420px) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.shock-visual-card,
.shock-form-card {
  padding: 22px;
  border-radius: 20px;
  background: #f9fbfc;
  border: 1px solid #e6edf2;
}

.shock-visual-card h3 {
  margin: 0 0 14px;
  font-size: 16px;
  color: var(--shock-ink);
}

.shock-diagram-svg {
  display: block;
  width: 100%;
  height: auto;
  color: var(--shock-accent-strong);
}

.shock-diagram-track,
.shock-diagram-stop {
  stroke: #8ea2b4;
  stroke-width: 6;
  stroke-linecap: round;
}

.shock-diagram-stop {
  stroke: var(--shock-highlight);
}

.shock-diagram-mass {
  fill: #113956;
}

.shock-diagram-velocity,
.shock-diagram-distance,
.shock-diagram-force,
.shock-diagram-gravity {
  stroke-width: 4;
  stroke-linecap: round;
}

.shock-diagram-velocity {
  stroke: var(--shock-accent);
}

.shock-diagram-distance {
  stroke: #5f7388;
}

.shock-diagram-force {
  stroke: #db7b2b;
}

.shock-diagram-gravity {
  stroke: #cf3f45;
}

.shock-diagram-height {
  stroke: #5f7388;
  stroke-width: 3;
  stroke-dasharray: 8 6;
}

.shock-diagram-text {
  font-size: 20px;
  font-weight: 700;
  fill: currentColor;
}

.shock-diagram-text--mass {
  fill: #fff;
}

.shock-equation {
  margin: 18px 0 0;
  padding: 14px 16px;
  border-radius: 14px;
  background: #fff;
  font-size: 18px;
  font-weight: 700;
  color: var(--shock-accent-strong);
  text-align: center;
}

.shock-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.shock-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.shock-field span {
  font-size: 14px;
  font-weight: 600;
  color: var(--shock-ink);
}

.shock-field-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 110px;
  gap: 10px;
}

.shock-field-row--single {
  grid-template-columns: 1fr;
}

.shock-field input,
.shock-field select,
.shock-result-head select {
  height: 46px;
  padding: 0 14px;
  border: 1px solid #cfdae3;
  border-radius: 12px;
  background: #fff;
  color: var(--shock-ink);
  font-size: 15px;
}

.shock-field input[readonly] {
  background: #eef4f8;
  color: var(--shock-muted);
}

.shock-field input:focus,
.shock-field select:focus,
.shock-result-head select:focus {
  outline: none;
  border-color: var(--shock-accent);
  box-shadow: 0 0 0 3px rgba(15, 109, 140, 0.12);
}

.shock-result-card {
  margin-top: 22px;
  padding: 20px 22px;
  border-radius: 18px;
  background: linear-gradient(135deg, #10354c 0%, #134b6a 100%);
  color: #fff;
}

.shock-result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.shock-result-head strong {
  font-size: 15px;
}

.shock-result-head select {
  width: 92px;
  color: var(--shock-ink);
}

.shock-result-value {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
}

.shock-result-value span {
  font-size: 28px;
  font-weight: 800;
  line-height: 1;
}

.shock-result-value em {
  font-size: 16px;
  font-style: normal;
  color: rgba(255, 255, 255, 0.82);
}

.shock-result-formula {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.88);
}

.shock-result-formula .katex {
  color: #fff;
}

.shock-error {
  min-height: 20px;
  margin: 10px 0 0;
  font-size: 13px;
  font-weight: 600;
  color: #ffd1d1;
}

.shock-formula-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 26px;
}

.shock-formula-card {
  padding: 20px;
  border-radius: 18px;
  background: #fff;
  border: 1px solid var(--shock-line);
}

.shock-formula-card h3 {
  margin: 0 0 10px;
  font-size: 16px;
  color: var(--shock-ink);
}

.shock-formula-card p {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--shock-accent-strong);
}

.shock-reference {
  margin-top: 22px;
  padding: 16px 20px;
  border-radius: 16px;
  background: #f4f8fb;
  font-size: 14px;
  line-height: 1.7;
  color: var(--shock-muted);
}

.shock-reference strong {
  color: var(--shock-ink);
}

.shock-reference a {
  color: var(--shock-accent);
  text-decoration: underline;
}

@media (max-width: 980px) {
  .shock-intro-card,
  .shock-layout,
  .shock-formula-grid {
    grid-template-columns: 1fr;
  }

  .shock-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .shock-panel,
  .shock-visual-card,
  .shock-form-card,
  .shock-intro-card {
    padding: 18px;
    border-radius: 18px;
  }

  .shock-field-row {
    grid-template-columns: 1fr 96px;
  }

  .shock-tab-btn {
    width: 100%;
    justify-content: center;
  }
}