.dt-tool-shell {
  background: var(--dt-color-surface);
  border: 1px solid var(--dt-color-border);
  border-radius: var(--dt-radius);
  box-shadow: var(--dt-shadow);
  padding: 32px;
  color: var(--dt-color-text);
}

.dt-tool-header {
  margin-bottom: 24px;
}

.dt-tool-title {
  margin: 0 0 8px;
  font-size: 32px;
  line-height: 1.2;
  font-weight: 700;
}

.dt-tool-intro {
  margin: 0;
  color: var(--dt-color-muted);
  font-size: 16px;
  line-height: 1.7;
}

.dt-tool-grid,
.dt-scenario-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.dt-scenario-grid {
  margin-top: 8px;
}

.dt-scenario-card {
  border: 1px solid var(--dt-color-border);
  border-radius: 16px;
  padding: 20px;
  background: #fbfbfa;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.dt-scenario-card.is-invalid {
  border-color: var(--dt-color-error);
  background: var(--dt-color-error-bg);
  box-shadow: 0 0 0 3px rgba(180, 35, 24, 0.08);
}

.dt-scenario-card h3 {
  margin: 0 0 16px;
  font-size: 20px;
}

.dt-field {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dt-field span {
  font-size: 14px;
  font-weight: 600;
}

.dt-field-help {
  display: block;
  margin-top: -2px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--dt-color-muted);
}

.dt-field input,
.dt-field select {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--dt-color-border);
  border-radius: 12px;
  padding: 0 14px;
  font-size: 16px;
  background: #fff;
  color: var(--dt-color-text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.dt-field input::placeholder,
.dt-field select::placeholder {
  color: #94a3b8;
}

.dt-field input:focus,
.dt-field select:focus {
  outline: 0;
  border-color: var(--dt-color-accent-dark);
  box-shadow: 0 0 0 4px var(--dt-color-focus);
}

.dt-field.is-invalid input,
.dt-field.is-invalid select {
  border-color: var(--dt-color-error);
  background: var(--dt-color-error-bg);
  box-shadow: 0 0 0 3px rgba(180, 35, 24, 0.08);
}

.dt-tool-actions {
  margin-top: 24px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.dt-button {
  border: 0;
  border-radius: 999px;
  min-height: 48px;
  padding: 0 24px;
  background: var(--dt-color-accent);
  color: #111827;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.dt-button:hover {
  background: var(--dt-color-accent-dark);
  color: #111827;
}

.dt-button:focus {
  outline: 0;
  box-shadow: 0 0 0 4px var(--dt-color-focus);
}

.dt-button:active {
  transform: translateY(1px);
}

.dt-tool-status {
  display: none;
  width: 100%;
  margin-top: 14px;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid var(--dt-color-border);
  font-size: 14px;
  line-height: 1.6;
}

.dt-tool-status.is-visible {
  display: block;
}

.dt-tool-status--error {
  border-color: rgba(180, 35, 24, 0.18);
  background: var(--dt-color-error-bg);
  color: var(--dt-color-error);
}

.dt-tool-status--success {
  border-color: rgba(2, 122, 72, 0.18);
  background: var(--dt-color-success-bg);
  color: var(--dt-color-success);
}

.dt-results {
  margin-top: 28px;
}

.dt-results-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.dt-results-grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.dt-results-grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.dt-result-card,
.dt-chart-card {
  border: 1px solid var(--dt-color-border);
  border-radius: 16px;
  background: #fff;
  padding: 20px;
}

.dt-result-card span {
  display: block;
  font-size: 13px;
  color: var(--dt-color-muted);
  margin-bottom: 10px;
}

.dt-result-card strong {
  display: block;
  font-size: 28px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.dt-chart-card {
  margin-top: 18px;
  background: linear-gradient(180deg, #ffffff 0%, #fcfcfb 100%);
}

.dt-chart-card h3 {
  margin: 0 0 14px;
  font-size: 18px;
  letter-spacing: -0.01em;
}

.dt-chart-card canvas {
  display: block;
  width: 100%;
  max-width: 100%;
}

@media (max-width: 1024px) {
  .dt-results-grid,
  .dt-results-grid--3,
  .dt-results-grid--2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .dt-tool-shell {
    padding: 22px;
  }

  .dt-tool-title {
    font-size: 26px;
  }

  .dt-tool-grid,
  .dt-scenario-grid,
  .dt-results-grid,
  .dt-results-grid--3,
  .dt-results-grid--2 {
    grid-template-columns: 1fr;
  }
}

/* ===== DT TOOLS PAGE SHELL ===== */
.dt-tools-page {
  background: #f8f8f6;
  padding: 24px 16px 56px;
}

.dt-tools-page__container {
  max-width: 1120px;
  margin: 0 auto;
}

.dt-tools-page .dt-tools-tabs {
  max-width: 1024px;
  margin: 0 auto;
}

.dt-tools-page .dt-tools-tabs__header {
  margin-bottom: 22px;
}

.dt-tools-page .dt-tools-tabs__title {
  margin: 0 0 20px;
  text-align: center;
  font-size: 44px;
  line-height: 1.08;
  letter-spacing: -0.035em;
  font-weight: 700;
  color: var(--dt-color-text);
}

.dt-tools-page .dt-tools-tabs__panels {
  width: 100%;
}

@media (max-width: 1024px) {
  .dt-tools-page {
    padding: 20px 14px 44px;
  }

  .dt-tools-page__container {
    max-width: 100%;
  }

  .dt-tools-page .dt-tools-tabs {
    max-width: 100%;
  }
}

@media (max-width: 767px) {
  .dt-tools-page {
    padding: 16px 12px 36px;
  }

  .dt-tools-page .dt-tools-tabs__title {
    font-size: 34px;
    line-height: 1.12;
  }
}

/* ===== DT TOOLS TABS - VISUAL POLISH ===== */
.dt-tools-page .dt-tools-tabs {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 0 24px;
}

.dt-tools-page .dt-tools-tabs__inner {
  width: 100%;
}

.dt-tools-page .dt-tools-tabs__header {
  margin-bottom: 22px;
}

.dt-tools-page .dt-tools-tabs__title {
  margin: 0 0 20px;
  text-align: center;
  font-size: 44px;
  line-height: 1.08;
  letter-spacing: -0.035em;
  font-weight: 700;
  color: var(--dt-color-text);
}

.dt-tools-page .dt-tools-tabs__note {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 18px 20px;
  border: 1px solid rgba(220, 191, 115, 0.42);
  border-radius: 12px;
  background: #fbf7e8;
}

.dt-tools-page .dt-tools-tabs__note-icon {
  flex: 0 0 26px;
  width: 26px;
  height: 26px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #c58a10;
  border: 1px solid rgba(197, 138, 16, 0.35);
  background: #fff7da;
}

.dt-tools-page .dt-tools-tabs__note-body strong {
  display: block;
  margin-bottom: 4px;
  font-size: 17px;
  line-height: 1.35;
  color: #9a6c09;
}

.dt-tools-page .dt-tools-tabs__note-body p {
  margin: 0;
  line-height: 1.72;
  color: #8b6b1f;
}

.dt-tools-page .dt-tools-tabs__nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 20px;
}

.dt-tools-page .dt-tools-tabs__tab {
  border: 1px solid #ebe7de;
  border-radius: 999px;
  min-height: 46px;
  padding: 0 20px;
  background: #fff;
  color: #334155;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.025);
  transition: border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease;
}

.dt-tools-page .dt-tools-tabs__tab:hover {
  transform: translateY(-1px);
  border-color: #dcbf73;
}

.dt-tools-page .dt-tools-tabs__tab.is-active {
  background: var(--dt-color-accent);
  color: #111827;
  border-color: var(--dt-color-accent);
  box-shadow: 0 6px 14px rgba(220, 191, 115, 0.18);
}

.dt-tools-page .dt-tools-tabs__panel {
  display: none;
}

.dt-tools-page .dt-tools-tabs__panel.is-active {
  display: block;
}

.dt-tools-page .dt-tools-tabs__info {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 18px;
  padding: 18px 20px;
  border: 1px solid #d7e2f1;
  border-radius: 12px;
  background: #eef4ff;
}

.dt-tools-page .dt-tools-tabs__info-icon {
  flex: 0 0 28px;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  border: 1px solid #d7e2f1;
  color: #2b5cab;
  font-weight: 700;
}

.dt-tools-page .dt-tools-tabs__info-body h2 {
  margin: 0 0 6px;
  font-size: 18px;
  line-height: 1.28;
  letter-spacing: -0.02em;
}

.dt-tools-page .dt-tools-tabs__info-body p {
  margin: 0;
  color: #475569;
  line-height: 1.72;
  font-size: 15px;
}

/* Flatten tool shell inside tabs to match mockup */
.dt-tools-page .dt-tools-tabs__tool-wrap .dt-tool-shell {
  border-radius: 10px;
  border: 1px solid #e8e6df;
  box-shadow: none;
  background: #fff;
  padding: 18px 18px 20px;
}

.dt-tools-page .dt-tools-tabs__tool-wrap .dt-tool-header {
  display: none;
}

.dt-tools-page .dt-tools-tabs__tool-wrap .dt-results {
  margin-top: 16px;
}

.dt-tools-page .dt-tools-tabs__tool-wrap .dt-result-card,
.dt-tools-page .dt-tools-tabs__tool-wrap .dt-chart-card {
  border-radius: 12px;
  box-shadow: none;
}

.dt-tools-page .dt-tools-tabs__tool-wrap .dt-chart-card {
  background: #fff;
}

.dt-tools-page .dt-tools-tabs__tool-wrap .dt-tool-grid,
.dt-tools-page .dt-tools-tabs__tool-wrap .dt-scenario-grid {
  gap: 16px;
}

.dt-tools-page .dt-tools-tabs__tool-wrap .dt-field {
  gap: 8px;
}

.dt-tools-page .dt-tools-tabs__tool-wrap .dt-field span {
  font-size: 13px;
}

.dt-tools-page .dt-tools-tabs__tool-wrap .dt-field-help {
  font-size: 11px;
  line-height: 1.45;
}

.dt-tools-page .dt-tools-tabs__tool-wrap .dt-field input,
.dt-tools-page .dt-tools-tabs__tool-wrap .dt-field select {
  min-height: 44px;
  border-radius: 10px;
  font-size: 15px;
}

.dt-tools-page .dt-tools-tabs__tool-wrap .dt-tool-actions {
  margin-top: 18px;
}

.dt-tools-page .dt-tools-tabs__tool-wrap .dt-button {
  min-height: 44px;
  padding: 0 18px;
  font-size: 15px;
}

.dt-tools-page .dt-tools-tabs__tool-wrap .dt-result-card span {
  font-size: 12px;
  margin-bottom: 8px;
}

.dt-tools-page .dt-tools-tabs__tool-wrap .dt-result-card strong {
  font-size: 24px;
}

.dt-tools-page .dt-tools-tabs__tool-wrap .dt-scenario-card {
  border-radius: 10px;
  padding: 14px;
  background: #fcfcfb;
}

.dt-tools-page .dt-tools-tabs__tool-wrap .dt-scenario-card h3 {
  margin-bottom: 12px;
  font-size: 18px;
}

@media (max-width: 767px) {
  .dt-tools-page .dt-tools-tabs {
    padding-top: 0;
  }

  .dt-tools-page .dt-tools-tabs__title {
    font-size: 34px;
  }

  .dt-tools-page .dt-tools-tabs__note,
  .dt-tools-page .dt-tools-tabs__info {
    padding: 16px;
  }

  .dt-tools-page .dt-tools-tabs__tab {
    min-height: 44px;
    padding: 0 16px;
  }

  .dt-tools-page .dt-tools-tabs__tool-wrap .dt-tool-shell {
    padding: 16px;
  }
}