/* ========== Unit Converter Page ========== */
.tool-container { max-width: 1200px; margin: 0 auto; padding: 24px; }
.tool-header { text-align: center; margin-bottom: 24px; }
.tool-header h1 { font-size: 32px; font-weight: 800; color: var(--color-heading); margin-bottom: 8px; }
.tool-header .tool-desc { font-size: 16px; color: var(--color-muted); max-width: 700px; margin: 0 auto; line-height: 1.6; }

/* Control bar with primary input */
.control-bar { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; padding: 14px 20px; background: linear-gradient(135deg, #f0f9ff 0%, #eff6ff 100%); border: 2px solid #bfdbfe; border-radius: 12px; }
.control-group { display: flex; align-items: center; gap: 8px; }
.control-group label { font-size: 13px; font-weight: 600; color: var(--color-muted); white-space: nowrap; }
.control-group select { padding: 8px 14px; border: 2px solid #bfdbfe; border-radius: 8px; font-size: 14px; font-weight: 600; background: #fff; color: var(--color-text); cursor: pointer; outline: none; transition: border-color 0.2s; }
.control-group select:focus { border-color: var(--color-primary); }
.control-group select option { font-weight: 400; }
.control-input-group { flex: 1; min-width: 120px; }
.control-input { width: 100%; padding: 8px 14px; border: 2px solid #bfdbfe; border-radius: 8px; font-size: 16px; font-weight: 700; font-family: 'Consolas', 'Monaco', 'Courier New', monospace; outline: none; transition: border-color 0.15s; background: #fff; color: var(--color-text); box-sizing: border-box; }
.control-input:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.15); }
.control-unit-group { flex: 0 0 140px; }
.control-unit-select { width: 100%; appearance: none; -webkit-appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23475569' d='M6 8L1 3h10z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 32px; }

/* Buttons */
.tool-btn { display: inline-flex; align-items: center; gap: 5px; padding: 8px 16px; border: none; border-radius: 6px; font-size: 13px; font-weight: 600; cursor: pointer; transition: all 0.2s; white-space: nowrap; }
.tool-btn-primary { background: var(--color-primary); color: #fff; }
.tool-btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.tool-btn-secondary { background: #10b981; color: #fff; }
.tool-btn-secondary:hover { background: #059669; }
.tool-btn-outline { background: #fff; color: var(--color-text); border: 1px solid var(--color-border); }
.tool-btn-outline:hover { background: var(--color-bg-hover); border-color: var(--color-primary); }
.tool-btn-danger { background: #ef4444; color: #fff; }
.tool-btn-danger:hover { background: #dc2626; }

/* Quick presets bar */
.presets-bar { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-bottom: 16px; padding: 10px 16px; background: #f0f9ff; border: 1px solid #bae6fd; border-radius: 10px; min-height: 42px; }
.presets-bar .presets-label { font-size: 12px; font-weight: 600; color: #0369a1; white-space: nowrap; margin-right: 4px; }
.preset-btn { display: inline-flex; align-items: center; gap: 2px; padding: 5px 12px; font-size: 12px; background: #fff; border: 1px solid #bae6fd; border-radius: 6px; color: #0369a1; cursor: pointer; transition: all 0.15s; font-family: 'Consolas', 'Monaco', 'Courier New', monospace; }
.preset-btn:hover { background: #e0f2fe; border-color: #0284c7; }

/* Primary Input Area */
.primary-input-area { margin-bottom: 16px; padding: 16px 20px; background: linear-gradient(135deg, #f0f9ff 0%, #eff6ff 100%); border: 2px solid #bfdbfe; border-radius: 12px; }
.primary-input-row { display: flex; gap: 12px; align-items: stretch; }
.primary-input-wrap { flex: 1; }
.primary-input { width: 100%; padding: 12px 16px; border: 2px solid #bfdbfe; border-radius: 8px; font-size: 20px; font-weight: 700; font-family: 'Consolas', 'Monaco', 'Courier New', monospace; outline: none; transition: border-color 0.15s; background: #fff; color: var(--color-text); box-sizing: border-box; }
.primary-input:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.15); }
.primary-unit-wrap { flex: 0 0 140px; }
.primary-unit-select { width: 100%; height: 100%; padding: 12px 16px; border: 2px solid #bfdbfe; border-radius: 8px; font-size: 16px; font-weight: 600; background: #fff; color: var(--color-text); cursor: pointer; outline: none; transition: border-color 0.15s; box-sizing: border-box; appearance: none; -webkit-appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23475569' d='M6 8L1 3h10z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 32px; }
.primary-unit-select:focus { border-color: var(--color-primary); }
.primary-input-hint { margin-top: 8px; font-size: 12px; color: #64748b; }

/* All units - card grid layout (3 per row, read-only results) */
.units-table-wrap { border: 1px solid var(--color-border); border-radius: 12px; overflow: hidden; margin-bottom: 12px; padding: 12px; background: var(--color-bg-card); }
.units-table-header { display: none; }
.units-table-body { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; max-height: 520px; overflow-y: auto; }
.unit-row { display: flex; flex-direction: column; gap: 4px; padding: 10px 12px; border: 1px solid var(--color-border); border-radius: 8px; background: #fff; transition: background 0.1s, border-color 0.15s; cursor: pointer; }
.unit-row:hover { background: #f8fafc; border-color: #cbd5e1; }
.unit-row.active-row { background: #eff6ff; border-color: var(--color-primary); }
.unit-row-name { font-size: 13px; font-weight: 600; color: var(--color-text); }
.unit-row-symbol { font-size: 11px; color: var(--color-muted); font-family: 'Consolas', 'Monaco', 'Courier New', monospace; }
.unit-row-value { font-size: 16px; font-weight: 700; color: var(--color-primary); font-family: 'Consolas', 'Monaco', 'Courier New', monospace; text-align: right; word-break: break-all; line-height: 1.3; }
.unit-row-copy { align-self: flex-end; padding: 2px 6px; display: flex; align-items: center; justify-content: center; cursor: pointer; font-size: 13px; opacity: 0.4; transition: opacity 0.15s; background: none; border: none; color: var(--color-muted); }
.unit-row-copy:hover { opacity: 1; color: var(--color-primary); }

/* Toast message */
.toast-msg { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); padding: 10px 24px; border-radius: 8px; font-size: 14px; font-weight: 500; z-index: 999; opacity: 0; transition: opacity 0.3s; pointer-events: none; }
.toast-msg.show { opacity: 1; }
.toast-success { background: #059669; color: #fff; }
.toast-error { background: #dc2626; color: #fff; }
.toast-info { background: #2563eb; color: #fff; }

/* Copy all bar */
.copy-all-bar { display: flex; justify-content: flex-end; gap: 8px; margin-bottom: 16px; }
.copy-all-bar .copy-count { font-size: 12px; color: var(--color-muted); display: flex; align-items: center; }

/* Formula section */
.formula-section { margin-bottom: 16px; padding: 16px 20px; background: #faf5ff; border: 1px solid #e9d5ff; border-radius: 10px; display: none; }
.formula-section.show { display: block; }
.formula-section h4 { font-size: 13px; font-weight: 700; color: #7c3aed; margin-bottom: 8px; }
.formula-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.formula-item { font-size: 13px; font-family: 'Consolas', 'Monaco', 'Courier New', monospace; color: #6d28d9; padding: 4px 8px; background: #fff; border-radius: 4px; border: 1px solid #e9d5ff; }

/* History section */
.history-section { margin-bottom: 16px; padding: 12px 16px; background: var(--color-bg-card); border: 1px solid var(--color-border); border-radius: 10px; }
.history-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.history-header h4 { font-size: 13px; font-weight: 700; color: var(--color-heading); }
.history-body { display: flex; flex-wrap: wrap; gap: 6px; min-height: 32px; }
.history-item { display: inline-flex; align-items: center; gap: 4px; padding: 4px 12px; background: #f3f4f6; border: 1px solid #e5e7eb; border-radius: 6px; font-size: 12px; font-family: 'Consolas', 'Monaco', 'Courier New', monospace; color: var(--color-text); cursor: pointer; transition: all 0.15s; }
.history-item:hover { background: #e0f2fe; border-color: #93c5fd; }
.history-empty { font-size: 13px; color: var(--color-muted); }

/* Status */
.status-box { padding: 12px 16px; border-radius: 8px; margin-bottom: 12px; font-size: 14px; display: none; }
.status-box.show { display: block; }
.status-success { background: #f0fdf4; border: 1px solid #bbf7d0; color: #16a34a; }
.status-error { background: #fef2f2; border: 1px solid #fecaca; color: #dc2626; }
.status-info { background: #eff6ff; border: 1px solid #bfdbfe; color: #1d4ed8; }

/* Info section */
.tool-info { margin-top: 32px; padding: 24px; background: var(--color-bg-card); border-radius: 12px; border: 1px solid var(--color-border); }
.tool-info h2 { font-size: 20px; font-weight: 700; color: var(--color-heading); margin-bottom: 16px; }
.tool-info h3 { font-size: 18px; font-weight: 600; color: var(--color-heading); margin: 20px 0 12px; }
.tool-info p { font-size: 15px; color: var(--color-text); line-height: 1.8; margin-bottom: 12px; }
.tool-info ul { margin: 0 0 16px 24px; font-size: 15px; line-height: 1.8; color: var(--color-text); }
.tool-info li { margin-bottom: 6px; }
.tool-info code { background: #f3f4f6; padding: 2px 6px; border-radius: 4px; font-size: 13px; font-family: 'Consolas', 'Monaco', 'Courier New', monospace; color: #be185d; }
.tool-info .info-tip { padding: 12px 16px; background: #eff6ff; border-radius: 8px; color: #1e40af; margin-top: 16px; }

/* ========== New 3-row layout ========== */
.converter-row { display: flex; gap: 16px; align-items: flex-start; }
.category-list { flex: 0 0 100px; display: flex; flex-direction: column; gap: 3px; }
.cat-btn { display: block; width: 100%; padding: 8px 12px; border: 1px solid var(--color-border); border-radius: 6px; background: #fff; color: var(--color-text); font-size: 13px; font-weight: 500; cursor: pointer; text-align: left; transition: all 0.15s; white-space: nowrap; }
.cat-btn:hover { background: #f0f4ff; border-color: var(--color-primary); }
.cat-btn.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); font-weight: 600; }
.converter-main { flex: 1; min-width: 0; }

/* Small screen fallback */
@media (max-width: 700px) {
  .converter-row { flex-direction: column; }
  .category-list { flex: none; width: 100%; flex-direction: row; flex-wrap: wrap; gap: 4px; }
  .cat-btn { width: auto; flex: 0 0 auto; padding: 6px 10px; font-size: 12px; }
}

/* Responsive */
@media (max-width: 900px) {
  .units-table-body { grid-template-columns: repeat(2, 1fr); }
  .control-bar { flex-direction: column; align-items: stretch; }
  .formula-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .tool-container { padding: 12px; }
  .tool-header h1 { font-size: 24px; }
  .units-table-body { grid-template-columns: 1fr; }
  .unit-row-name { font-size: 12px; }
  .unit-row-input { font-size: 12px; padding: 5px 6px; }
  .presets-bar { padding: 8px 10px; }
  .preset-btn { font-size: 11px; padding: 4px 8px; }
}