.tool-hero { background: linear-gradient(135deg, #78350f 0%, #d97706 50%, #f59e0b 100%); }
.form-panel { background: white; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.75rem; box-shadow: var(--shadow-sm); }
.form-panel-header { display: flex; align-items: center; gap: 10px; margin-bottom: 1.25rem; padding-bottom: 1rem; border-bottom: 1px solid var(--border-light); }
.form-panel-icon { font-size: 1.4rem; }
.form-panel-title { font-size: 1rem; font-weight: 700; }
.field-group { margin-bottom: 1rem; }
.field-label { display: block; font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-muted); margin-bottom: 6px; }
.field-input { width: 100%; padding: 0.7rem 0.875rem; border: 1.5px solid var(--border); border-radius: var(--radius-sm); font-size: 0.95rem; font-family: 'Inter',sans-serif; outline: none; background: var(--bg); color: var(--text); transition: var(--transition); }
.field-input:focus { border-color: var(--warning); background: white; }
.btn-calc { width: 100%; padding: 0.875rem; background: linear-gradient(135deg, #d97706, #f59e0b); color: white; border: none; border-radius: var(--radius-sm); font-size: 1rem; font-weight: 700; cursor: pointer; font-family: 'Inter',sans-serif; transition: var(--transition); margin-top: 0.5rem; }
.btn-calc:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(217,119,6,0.4); }
.btn-reset-small { width: 100%; padding: 0.6rem; background: none; border: 1.5px solid var(--border); border-radius: var(--radius-sm); font-size: 0.88rem; font-weight: 600; cursor: pointer; font-family: 'Inter',sans-serif; color: var(--text-muted); margin-top: 0.5rem; transition: var(--transition); }
.result-card { background: white; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.75rem; box-shadow: var(--shadow-sm); }
.placeholder-card { background: white; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 3rem 2rem; text-align: center; box-shadow: var(--shadow-sm); }
.placeholder-icon { font-size: 3rem; margin-bottom: 0.75rem; opacity: 0.3; }
.gst-mode-label { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 0.75rem; }
.btn-copy-gst { padding: 0.5rem 1rem; background: none; border: 1.5px solid var(--border); border-radius: 6px; font-size: 0.78rem; font-weight: 700; cursor: pointer; font-family: 'Inter',sans-serif; color: var(--text-muted); transition: var(--transition); }
.btn-copy-gst:hover { border-color: var(--primary); color: var(--primary); }