:root { --main-color: #e63946; } /* Màu mặc định */

.lp-calc-container { background: #fff; border: 1px solid #eee; padding: 25px; border-radius: 8px; max-width: 1000px; margin: 20px auto; color: #333; }
.lp-calc-row { display: flex; flex-wrap: wrap; gap: 40px; }
.lp-calc-col { flex: 1; min-width: 320px; }

.lp-input-wrapper { position: relative; display: flex; align-items: center; margin-bottom: 10px; }
.lp-input-wrapper input { width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 4px; font-size: 16px; font-weight: bold; }
.lp-input-wrapper .unit { position: absolute; right: 15px; color: #888; font-size: 14px; }

.lp-input-group label { display: block; margin-bottom: 8px; font-size: 14px; color: #666; }
input[type=range] { width: 100%; accent-color: var(--main-color); margin-bottom: 20px; }

.result-section { background: #fdfdfd; border: 1px solid #f0f0f0; padding: 25px; border-radius: 8px; text-align: center; }
.result-box p { margin: 0; color: #777; }
.result-box h3 { font-size: 36px; color: var(--main-color); margin: 10px 0 25px; font-weight: 800; }

.res-item { display: flex; justify-content: space-between; padding: 12px 0; border-bottom: 1px solid #eee; }
.lp-btn-main { background: var(--main-color); color: #fff; border: none; padding: 18px; width: 100%; border-radius: 4px; font-weight: bold; cursor: pointer; font-size: 16px; transition: 0.3s; margin-top: 20px; }
.lp-btn-main:hover { opacity: 0.9; }

/* Modal chuyên nghiệp */
.lp-modal { display: none; position: fixed; z-index: 10000; left: 0; top: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.7); backdrop-filter: blur(3px); }
.lp-modal-content { background: #fff; margin: 5% auto; padding: 40px; width: 90%; max-width: 450px; border-radius: 12px; position: relative; }
.lp-close { position: absolute; right: 20px; top: 15px; font-size: 28px; cursor: pointer; color: #aaa; }