/* ================= 🌟 基础与排版 ================= */
.epc-wrapper { padding: 32px 0; }
.epc-header { text-align: center; margin-bottom: 32px; }
.epc-title { font-size: 1.8rem; font-weight: 800; color: var(--text-main); margin-bottom: 12px; }
.epc-subtitle { color: var(--text-muted); max-width: 800px; margin: 0 auto; line-height: 1.6; }

/* ================= 🌟 网格布局 ================= */
.epc-workspace { display: grid; grid-template-columns: 420px 1fr; gap: 24px; align-items: stretch; }
.epc-col-left { display: flex; flex-direction: column; gap: 24px; min-width: 0; }
.epc-col-right { display: flex; flex-direction: column; gap: 24px; height: 100%; min-height: 0; }
@media(max-width: 900px) { .epc-workspace { grid-template-columns: 1fr; } }

/* ================= 🌟 卡片风格 ================= */
.epc-card { background: var(--bg-surface); border: 1px solid var(--border-color); border-radius: 20px; padding: 28px; box-shadow: 0 4px 16px rgba(0,0,0,0.03); display: flex; flex-direction: column; box-sizing: border-box; }
.epc-panel-title { font-weight: 700; color: var(--text-main); font-size: 1.1rem; border-bottom: 1px solid var(--border-color); padding-bottom: 16px; margin-bottom: 24px; }

/* ================= 🌟 表单组件 ================= */
.epc-form-group { margin-bottom: 20px; }
.epc-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.epc-label { display: block; font-size: 0.9rem; font-weight: 600; color: var(--text-muted); margin-bottom: 8px; }

.epc-input-box { display: flex; align-items: center; background: var(--bg-body); border: 2px solid var(--border-color); border-radius: 10px; padding: 0 16px; transition: 0.2s; }
.epc-input-box:focus-within { border-color: var(--primary-color); box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.1); }
.epc-input { flex: 1; width: 100%; min-width: 0; padding: 12px 0; border: none; background: transparent; color: var(--text-main); font-size: 1.2rem; font-weight: 700; font-family: monospace; outline: none; }
.epc-input::-webkit-outer-spin-button, .epc-input::-webkit-inner-spin-button { -webkit-appearance: none; }
.epc-currency { font-weight: 700; color: var(--text-muted); font-size: 1.1rem; user-select: none; }
.epc-input-box .epc-currency:first-child { margin-right: 8px; }
.epc-input-box .epc-currency:last-child { margin-left: 8px; font-size: 0.9rem; }

/* 🌟 特殊高亮输入区 */
.epc-highlight-group { padding: 20px; background: rgba(var(--primary-rgb), 0.05); border-radius: 12px; border: 1px dashed rgba(var(--primary-rgb), 0.3); margin-top: 24px; }

/* ================= 🌟 结果看板 ================= */
.epc-primary-box { background: var(--bg-body); border: 1px solid var(--border-color); border-radius: 16px; padding: 32px 24px; text-align: center; margin-bottom: 24px; }
.epc-res-label { font-size: 0.95rem; font-weight: 700; color: var(--text-muted); margin-bottom: 12px; text-transform: uppercase; letter-spacing: 1px; }
.epc-res-value { font-size: clamp(2.2rem, 3.5vw, 3rem); font-weight: 800; color: var(--text-main); font-family: monospace; word-break: break-all; line-height: 1.2; }
.epc-res-value.highlight { color: #2ed573; /* 绿色，代表省钱 */ }
.epc-res-value.secondary { color: var(--primary-color); font-size: clamp(1.8rem, 2.5vw, 2.2rem); }

.epc-divider { width: 40px; height: 4px; background: var(--border-color); margin: 24px auto; border-radius: 2px; }

.epc-breakdown { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; padding-top: 20px; border-top: 1px solid var(--border-color); }
.epc-bd-item { display: flex; align-items: flex-start; gap: 12px; background: rgba(var(--primary-rgb), 0.03); padding: 16px; border-radius: 12px; border: 1px solid var(--border-color); }
.epc-bd-item.opacity-low { opacity: 0.6; }
.epc-bd-icon { font-size: 1.5rem; margin-top: 2px; flex-shrink: 0; }
.epc-bd-text { display: flex; flex-direction: column; gap: 4px; }
.epc-bd-title { font-size: 0.85rem; color: var(--text-muted); font-weight: 600; }
.epc-bd-val { font-size: 1.15rem; font-weight: 700; color: var(--text-main); font-family: monospace; }

/* ================= 🌟 SEO 文章 ================= */
.epc-seo-box { margin-top: 32px; background: var(--bg-surface); padding: 32px; border-radius: 20px; border: 1px solid var(--border-color); box-sizing: border-box; width: 100%; }
.epc-seo-box h2 { font-size: 1.25rem; margin-bottom: 16px; color: var(--text-main); margin-top: 24px; }
.epc-seo-box h2:first-child { margin-top: 0; }
.epc-seo-box p, .epc-seo-box li { color: var(--text-muted); line-height: 1.8; margin-bottom: 12px; }