/* 4P 营销理论模型工具面板 */
.fourp-tool-panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    min-height: 0;
}

.fourp-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-muted, #f9fafb);
    flex-shrink: 0;
}

.fourp-toolbar-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.fourp-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.fourp-title i { color: #8b5cf6; }

.fourp-badge {
    font-size: 0.68rem;
    font-weight: 600;
    padding: 2px 7px;
    border-radius: 10px;
    background: rgba(139, 92, 246, 0.1);
    color: #7c3aed;
}

.fourp-toolbar-right {
    display: flex;
    align-items: center;
    gap: 6px;
}

.fourp-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 10px;
    font-size: 0.78rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-card);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
}

.fourp-btn:hover {
    border-color: #8b5cf6;
    color: #7c3aed;
}

.fourp-btn-primary {
    background: linear-gradient(135deg, #8b5cf6, #6366f1);
    border-color: transparent;
    color: #fff !important;
}

.fourp-btn-primary:hover {
    opacity: 0.88;
    border-color: transparent !important;
}

.fourp-canvas-wrap {
    flex: 1;
    overflow: auto;
    padding: 16px;
    background-color: #eef1f5;
    background-image: radial-gradient(circle, #c5cdd8 1px, transparent 1px);
    background-size: 18px 18px;
    min-height: 520px;
}

.fourp-board {
    position: relative;
    width: 100%;
    max-width: 920px;
    min-width: 720px;
    min-height: 580px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 48px 56px;
    padding: 36px 28px;
}

/* 中心连线 */
.fourp-connectors {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.fourp-line {
    stroke-width: 2;
    stroke-linecap: round;
}

.fourp-line-product  { stroke: #a78bfa; opacity: 0.55; }
.fourp-line-price    { stroke: #60a5fa; opacity: 0.55; }
.fourp-line-promotion{ stroke: #f472b6; opacity: 0.55; }
.fourp-line-place    { stroke: #22d3ee; opacity: 0.55; }

/* 中心节点 */
.fourp-hub {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 3;
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: #fff;
    border: 2px solid #e2e8f0;
    box-shadow: 0 4px 20px rgba(15, 23, 42, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    font-weight: 800;
    color: #334155;
    letter-spacing: 0.02em;
}

/* 象限 */
.fourp-quadrant {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 0;
}

.fourp-q-product  { grid-column: 1; grid-row: 1; align-items: flex-start; }
.fourp-q-price    { grid-column: 2; grid-row: 1; align-items: flex-end; }
.fourp-q-promotion{ grid-column: 1; grid-row: 2; align-items: flex-start; }
.fourp-q-place    { grid-column: 2; grid-row: 2; align-items: flex-end; }

.fourp-q-price .fourp-q-label,
.fourp-q-place .fourp-q-label {
    align-self: flex-end;
}

.fourp-q-watermark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -40%);
    font-size: 5rem;
    color: rgba(148, 163, 184, 0.12);
    pointer-events: none;
    user-select: none;
    z-index: 0;
    line-height: 1;
}

.fourp-q-price .fourp-q-watermark,
.fourp-q-place .fourp-q-watermark {
    left: auto;
    right: 20%;
    transform: translate(0, -40%);
}

.fourp-q-label {
    position: relative;
    z-index: 1;
    display: inline-block;
    padding: 5px 14px;
    border-radius: 20px;
    font-size: 0.82rem;
    font-weight: 700;
    color: #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.fourp-label-product   { background: linear-gradient(135deg, #8b5cf6, #a78bfa); }
.fourp-label-price     { background: linear-gradient(135deg, #3b82f6, #60a5fa); }
.fourp-label-promotion { background: linear-gradient(135deg, #ec4899, #f472b6); }
.fourp-label-place     { background: linear-gradient(135deg, #06b6d4, #22d3ee); }

/* 内容框 */
.fourp-content {
    position: relative;
    z-index: 1;
    width: 100%;
    min-height: 140px;
    padding: 14px 16px;
    border-radius: 14px;
    font-size: 0.8rem;
    line-height: 1.65;
    color: #1e293b;
    outline: none;
    cursor: text;
    word-break: break-word;
    white-space: pre-wrap;
    background: #fff;
    box-shadow: 0 2px 12px rgba(15, 23, 42, 0.06);
    transition: box-shadow 0.15s;
}

.fourp-content-product {
    border: 2px solid #c4b5fd;
    background: linear-gradient(160deg, #faf5ff 0%, #fff 40%);
}

.fourp-content-price {
    border: 2px solid #93c5fd;
    background: linear-gradient(160deg, #eff6ff 0%, #fff 40%);
}

.fourp-content-promotion {
    border: 2px solid #f9a8d4;
    background: linear-gradient(160deg, #fdf2f8 0%, #fff 40%);
}

.fourp-content-place {
    border: 2px solid #67e8f9;
    background: linear-gradient(160deg, #ecfeff 0%, #fff 40%);
}

.fourp-content:empty::before {
    content: '点击输入 4P 策略内容…';
    color: #94a3b8;
}

.fourp-content:focus {
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.25);
}

.fourp-content-price:focus {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.fourp-content-promotion:focus {
    box-shadow: 0 0 0 3px rgba(236, 72, 153, 0.25);
}

.fourp-content-place:focus {
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.25);
}
@media (max-width: 768px) {
    .fourp-board {
        min-width: 640px;
        gap: 40px 32px;
        padding: 28px 16px;
    }

    .fourp-hub {
        width: 60px;
        height: 60px;
        font-size: 1.1rem;
    }

    .fourp-q-watermark {
        font-size: 3.5rem;
    }
}