/* ===== Layout ===== */
.unit-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 28px;
  align-items: start;
}

.unit-main {
  min-width: 0;
}

.unit-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 2px 4px 0 rgb(15 23 42 / 0.08), 0 10px 25px -5px rgb(15 23 42 / 0.08), 0 1px 3px 0 rgb(79 70 229 / 0.05);
}

.unit-sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sidebar-section {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.sidebar-header {
  text-align: center;
  padding: 24px 16px !important;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
  border-color: transparent !important;
}

.sidebar-header h1 {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 6px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.sidebar-header p {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.85);
}

body[data-theme="dark"] .sidebar-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
}

.sidebar-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-title i { color: var(--primary); font-size: 0.9rem; }

.sidebar-tools { display: flex; flex-direction: column; gap: 8px; }

.sidebar-tool {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  transition: all 0.2s ease;
  text-decoration: none;
  background: var(--bg-soft);
}

.sidebar-tool:hover { background: var(--primary-50); transform: translateX(3px); }

.sidebar-tool-icon {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 10px; font-size: 16px; flex-shrink: 0;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
}

.sidebar-tool-info { flex: 1; min-width: 0; }
.sidebar-tool-name { font-size: 0.9rem; font-weight: 700; color: var(--text); margin-bottom: 2px; }
.sidebar-tool-desc { font-size: 0.78rem; color: var(--text-muted); }

body[data-theme="dark"] .sidebar-section { background: var(--bg-card); border-color: var(--border); }
body[data-theme="dark"] .sidebar-tool { background: var(--bg-muted); }
body[data-theme="dark"] .sidebar-tool:hover { background: var(--primary-50); }

/* ===== Ad Placeholder (fixed 300x250) ===== */
.ad-placeholder {
  width: 300px;
  height: 250px;
  margin: 0 auto;
  flex-shrink: 0;
  background: var(--bg-card);
  border: 2px dashed var(--border);
  border-radius: 14px;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center;
  padding: 20px;
  color: var(--text-muted);
  font-size: 0.82rem;
  line-height: 1.5;
}

.ad-placeholder .ad-icon { font-size: 1.8rem; color: var(--text-muted); margin-bottom: 10px; opacity: 0.4; }
.ad-placeholder .ad-label { font-weight: 600; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 4px; }
.ad-placeholder .ad-size { font-size: 0.75rem; color: var(--text-muted); opacity: 0.6; }

body[data-theme="dark"] .ad-placeholder { background: var(--bg-card); border-color: var(--border); }

/* ===== calc-bottom Styles ===== */
.calc-bottom {
  padding: 12px 0 56px;
}

.calc-bottom-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 18px;
  margin-bottom: 18px;
}

.calc-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 16px;
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.06);
  padding: 20px;
}

.calc-panel-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
}

.calc-panel-title i {
  color: var(--primary);
}

.calc-panel-lead {
  margin: 0 0 16px;
  color: var(--text-muted);
  line-height: 1.7;
}

.calc-feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.calc-feature-card {
  border-radius: 14px;
  padding: 14px;
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.08), rgba(99, 102, 241, 0.03));
  border: 1px solid rgba(99, 102, 241, 0.12);
}

.calc-feature-card.accent-green {
  background: linear-gradient(180deg, rgba(16, 185, 129, 0.12), rgba(16, 185, 129, 0.03));
  border-color: rgba(16, 185, 129, 0.14);
}

.calc-feature-card.accent-blue {
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.12), rgba(59, 130, 246, 0.03));
  border-color: rgba(59, 130, 246, 0.14);
}

.calc-feature-card.accent-orange {
  background: linear-gradient(180deg, rgba(245, 158, 11, 0.12), rgba(245, 158, 11, 0.03));
  border-color: rgba(245, 158, 11, 0.14);
}

.calc-feature-card.accent-violet {
  background: linear-gradient(180deg, rgba(168, 85, 247, 0.12), rgba(168, 85, 247, 0.03));
  border-color: rgba(168, 85, 247, 0.14);
}

.calc-feature-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 10px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
}

.accent-green .calc-feature-icon {
  background: linear-gradient(135deg, #10b981, #059669);
}

.accent-blue .calc-feature-icon {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
}

.accent-orange .calc-feature-icon {
  background: linear-gradient(135deg, #f59e0b, #d97706);
}

.accent-violet .calc-feature-icon {
  background: linear-gradient(135deg, #a855f7, #7c3aed);
}

.calc-feature-name {
  font-size: 14px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}

.calc-feature-desc {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-muted);
}

.calc-feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 18px;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.7;
}

.calc-feature-list i {
  color: #10b981;
  margin-right: 6px;
}

.shortcut-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.shortcut-table thead th {
  text-align: left;
  padding: 10px 0;
  color: var(--text-muted);
  font-weight: 700;
  border-bottom: 1px solid var(--border-light);
}

.shortcut-table tbody td {
  padding: 10px 0;
  border-bottom: 1px solid var(--border-light);
  color: var(--text);
}

.shortcut-table tbody td:first-child {
  font-family: 'SF Mono', Monaco, Consolas, monospace;
  color: var(--primary);
  font-weight: 700;
}

.calc-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.calc-step {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px;
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.08), rgba(99, 102, 241, 0.03));
}

.calc-step-num {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  color: #fff;
  font-weight: 800;
  font-size: 13px;
}

.calc-step-title {
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}

.calc-step-desc {
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.6;
}

.calc-use-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.calc-use-card {
  border-radius: 14px;
  padding: 16px;
  border: 1px solid var(--border-light);
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.06), rgba(255, 255, 255, 0.04));
}

.calc-use-card.warm { background: linear-gradient(180deg, rgba(245, 158, 11, 0.12), rgba(245, 158, 11, 0.03)); }
.calc-use-card.cool { background: linear-gradient(180deg, rgba(168, 85, 247, 0.12), rgba(168, 85, 247, 0.03)); }
.calc-use-card.green { background: linear-gradient(180deg, rgba(16, 185, 129, 0.12), rgba(16, 185, 129, 0.03)); }
.calc-use-card.amber { background: linear-gradient(180deg, rgba(59, 130, 246, 0.12), rgba(59, 130, 246, 0.03)); }

.calc-use-icon {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  margin-bottom: 10px;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
}

.warm .calc-use-icon { background: linear-gradient(135deg, #f59e0b, #d97706); }
.cool .calc-use-icon { background: linear-gradient(135deg, #a855f7, #7c3aed); }
.green .calc-use-icon { background: linear-gradient(135deg, #10b981, #059669); }
.amber .calc-use-icon { background: linear-gradient(135deg, #3b82f6, #2563eb); }

.calc-use-title {
  font-size: 14px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}

.calc-use-desc {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-muted);
}

.calc-knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.calc-knowledge-card {
  border-radius: 14px;
  padding: 16px;
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.08), rgba(255, 255, 255, 0.04));
  border: 1px solid rgba(99, 102, 241, 0.08);
}

.calc-knowledge-title {
  font-weight: 800;
  color: var(--text);
  margin-bottom: 8px;
}

.calc-knowledge-card p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.7;
  font-size: 13px;
}

.calc-cta {
  margin-top: 14px;
  border-radius: 16px;
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.10), rgba(168, 85, 247, 0.10));
  border: 1px solid rgba(99, 102, 241, 0.16);
}

.calc-cta-title {
  font-size: 15px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}

.calc-cta-title i {
  color: #8b5cf6;
  margin-right: 8px;
}

.calc-cta-text {
  color: var(--text-muted);
  line-height: 1.6;
  font-size: 13px;
}

body[data-theme="dark"] .calc-cta,
body[data-theme="dark"] .calc-feature-card,
body[data-theme="dark"] .calc-use-card,
body[data-theme="dark"] .calc-knowledge-card {
  border-color: var(--border);
}

/* ===== calc-bottom Responsive ===== */
@media (max-width: 860px) {
  .calc-bottom-grid {
    grid-template-columns: 1fr;
  }
  .calc-feature-grid, .calc-steps, .calc-use-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .calc-knowledge-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .calc-feature-grid, .calc-steps, .calc-use-grid, .calc-knowledge-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== SEO ===== */
.unit-seo {
  margin-top: 24px;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 14px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.unit-seo p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0;
}

body[data-theme="dark"] .unit-seo { background: var(--bg-card); border-color: var(--border); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .unit-layout { grid-template-columns: 1fr 280px; gap: 20px; }
}

@media (max-width: 860px) {
  .unit-layout { grid-template-columns: 1fr; }
  .unit-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
}

@media (max-width: 640px) {
  .unit-sidebar { grid-template-columns: 1fr; }
}

/* ===== Original Styles ===== */
.unit-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.unit-tab {
  padding: 10px 18px;
  background: var(--bg-soft);
  color: var(--text-secondary);
  border: 1px solid transparent;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.unit-tab:hover {
  background: var(--primary-50);
  color: var(--primary);
}

.unit-tab.active {
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  color: #fff;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.unit-pair {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 14px;
  align-items: end;
  margin-bottom: 20px;
}

.unit-box {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.unit-box label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 600;
}

.unit-input-wrap {
  background: var(--bg-soft);
  border: 2px solid var(--border-light);
  border-radius: 12px;
  transition: all 0.15s;
}

.unit-input-wrap:focus-within {
  border-color: var(--primary);
  background: #fff;
}

.unit-input-wrap input {
  width: 100%;
  padding: 14px 16px;
  border: none;
  background: transparent;
  font-size: 22px;
  font-weight: 600;
  color: var(--text);
  outline: none;
  font-family: inherit;
}

.unit-input-wrap input[readonly] {
  color: var(--primary);
  font-weight: 700;
}

.unit-box select {
  padding: 10px 14px;
  background: var(--bg-soft);
  color: var(--text);
  border: 1px solid var(--border-light);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  font-family: inherit;
}

.unit-box select:hover {
  border-color: var(--primary);
}

.unit-swap {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, #10b981, #059669);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 16px;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
  transition: transform 0.2s;
  margin-bottom: 12px;
}

.unit-swap:hover { transform: rotate(180deg); }

.unit-result {
  padding: 16px 20px;
  background: linear-gradient(135deg, var(--primary-50), var(--bg-soft));
  border-radius: 12px;
  font-size: 14px;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 18px;
  min-height: 48px;
  line-height: 1.7;
}

.unit-result .big {
  display: block;
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
}

.unit-table {
  border-top: 1px solid var(--border-light);
  padding-top: 18px;
}

.unit-table-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.unit-table-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 8px;
}

.unit-table-item {
  padding: 10px 12px;
  background: var(--bg-soft);
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.unit-table-item b {
  color: var(--text);
  font-weight: 600;
}

@media (max-width: 640px) {
  .unit-pair { grid-template-columns: 1fr; }
  .unit-swap { justify-self: center; transform: rotate(90deg); margin: 4px 0; }
  .unit-swap:hover { transform: rotate(270deg); }
  .unit-input-wrap input { font-size: 18px; }
}

/* Dark mode */
body[data-theme="dark"] .unit-input-wrap {
  background: #1e293b;
  border-color: #334155;
}
body[data-theme="dark"] .unit-input-wrap:focus-within {
  background: #0f172a;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}
body[data-theme="dark"] .unit-box select {
  background: #1e293b;
  border-color: #334155;
  color: #f1f5f9;
}
body[data-theme="dark"] .unit-tab {
  background: #1e293b;
  color: #cbd5e1;
  border-color: #334155;
}
body[data-theme="dark"] .unit-tab:hover {
  background: #312e81;
  color: #a5b4fc;
}
body[data-theme="dark"] .unit-tab.active {
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}
body[data-theme="dark"] .unit-result {
  background: linear-gradient(135deg, #312e81, #4c1d95);
  color: #cbd5e1;
}
body[data-theme="dark"] .unit-result .big {
  color: #a5b4fc;
}
body[data-theme="dark"] .unit-table-item {
  background: #1e293b;
  color: #cbd5e1;
}
body[data-theme="dark"] .unit-table-item b {
  color: #f1f5f9;
}